View Full Version : Noise levels for tracks etc
Ok, so I know my Nova is a tad noisey on the motorway, when driving over long distances (3 miles +) but just how loud is it? (approx)
I am guessing that its louder than 98Db (for that Brunter's thing) at full chat?
Anyone with 20XE on TBs any idea of 'official' noise levels?
craig green
17-09-07, 03:49 PM
Totally depends on the exhaust to be fair. If you think its loud, I'd get my own exhaust tip made. I saw someone with their own small bore tail insert for an Evo 8 at Combe.
It wasnt one of those hanging way off the back things like they give you either.
Maybe buy a db meter thingy. The ones they use look like a maplin/Tandy type one anyway.
Rick Draper
17-09-07, 04:00 PM
Brunters on the drive by is a 87.5db limit. Its 98db static.
OK, so I am screwed then!lol
I cant even hear the exhaust over the induction roar! Maybe I can get 4 small mufflers to stick onto the trumpets! :)
You will most probably need to make a air box of some kind to silence the tb's.
I'm having to make something for my mates as we cant get on any track :(
Donny however do noisy days which we'll be attending :)
BTW Pipercross do a proper air box for tb's which is basically what I'm going to work from when I do one
Just go to llandow, i didn't even see a decible meter in sight.
Croft it 95db, and if your car is dramatically louder than it is static, they'l pull you in to check again. Basically it makes it a pain in the ass.
Oulton park is 105db IIRC.
A friend of mine with a 340hp S14 200sx was making about 101db with some big fat dustbin size ehxaust. And my mates 300+hp scoob with Teg sport system was making around 98db.
So it's hard to say really, you probably need to buy a DB meter.
Oh, and has the car been mapped yet ?
you'l notice a huge reduction in noise once the car is mapped properly
Pretty sure Dougie said in his email that he'll be fetching a 'silencer bung' along just incase, its for 2.5" - 3.0" exhausts and fitted with a self tapper (need to drill tailpipe?)
Pretty confident mine will be within the limits.
Rich
nathan.
17-09-07, 05:46 PM
Dar made a air filter box for his to limit noise iirc. Pm him for piccies
BRoadGhost
17-09-07, 05:47 PM
Mine is louder than a fart in a church
NOT looking forward to track issues
Most places are about 98-100db static and 100db flyby. I have never been able to hear the exhaust over the induction roar on my car either.
I have only been banned for noise by one company (Trackday Events) who run a 100db flyby limit and said that my car was way over this yet I have been to Donnington with their 98db flyby with no problems at all! My car was flying past the Elises and other things that they had there and I got the impression that they just didn't want a fast modifyed car at their events, just production cars.
I have had my exhaust made with three silencers and now registers at 91db @ 4,500rpm. I would suggest that you pop over to your local track or exhaust place to get your car measured as per the static noise test.:thumb:
Philsutton
17-09-07, 07:20 PM
I made 115db at donnington on a driveby, that was still on standard turbo with a cat an low boost. Dread to think what it is now. My noise wasnt coming from the exhaust though.
Chris S
17-09-07, 07:29 PM
I made 115db at donnington on a driveby, that was still on standard turbo with a cat an low boost. Dread to think what it is now. My noise wasnt coming from the exhaust though.
DONT THINK THERE GOING TO APPRECIATE A 44M GATE THEN:cry:
Philsutton
17-09-07, 07:45 PM
nope my days of track days are over now lmfao, but saying that at totb they were supposed to have sound limits but never even did any static tests.
A friend of mine with a 340hp S14 200sx was making about 101db with some big fat dustbin size ehxaust. And my mates 300+hp scoob with Teg sport system was making around 98db.
In theory the S14 would be twice as loud as the Scooby, as for every 3db the actual noise is doubled.
Philsutton
17-09-07, 07:58 PM
ah yes good ol logarithms
Rick Draper
17-09-07, 08:27 PM
Rich how many box's have you got on your car? I have been to JP exhausts today and big rick is having my car in this week to have a look and see what he can do.
2 box's on mine, system is 2.5"
Could end up being over the noise limits for Brunters, but its a lot quiter than other Nova's i've seen (heard) run.
Rich
LOL, any guess's what mine will be !
http://img2.putfile.com/thumb/9/25007244216.jpg (http://www.putfile.com/pic.php?img=6539031)
vaughanmc
17-09-07, 10:30 PM
100% Straight Through :)
I'm guessing too loud lol
Mine is also straight through with just a backbox, had it a few months not been pulled yet. Custom made, they asked do you want it loud? 'Yes but not stupidly loud'
'Ok no boxes'
lol
edit- thats a redtop with a 4-1 manifold, 2 1/2 bore
yellow nova
17-09-07, 11:11 PM
What ive done for brunter, is and this is going to sound crap is cut an old tin up put some holes in it. and then put that over the end of my exhaust and it's really quite then. i know it wont look good but it will do the job
Its deffo an induction noise problem I have, not exhaust.
I will look into getting an enclosed airbox then....
craig green
18-09-07, 01:39 PM
Ashtal; with the straight through N/A. rather him than me!
I like turbo's because they absorb sound energy in the exhaust, to a degree.
Not looking forward to hearing my N/A 1600 when it cracks into life. Its going to be loud I think!
tom_beverley
18-09-07, 02:45 PM
Mine should be fine for Brunters, the noise from mine is the least of my worries - I JUST NEED TO GET IT BUILT & RUNNING! lollollol
I'm planning a Pipercross 600 something airbox for track use, its a sealed box with an intake pipe on one side, i'll find a pic in a min
http://www.pipercross.net/images/pipercross_600_1.jpg (http://www.pipercross.net/images/pipercross_600_1.jpg)
http://www.pipercross.net/images/pipercross_600_2.jpg
http://www.pipercross.net/images/pipercross_600_3.jpg
Just go to llandow, i didn't even see a decible meter in sight.
Not much point going to Llandow when it's a Bruntingthorpe bash ;) but I get what you mean :thumb:
I'm planning a Pipercross 600 something airbox for track use, its a sealed box with an intake pipe on one side, i'll find a pic in a min
http://www.pipercross.net/images/pipercross_600_1.jpg
http://www.pipercross.net/images/pipercross_600_2.jpg
http://www.pipercross.net/images/pipercross_600_3.jpg
You shouldn't really need that.
Mine comes in fine on noise with a pair of Pancake K&N's. Induction is noiser when they're off, but i still don't think it'd be over.
That's on a 95limit at Croft. So pretty much the lower end of the range
Meh, it looks cool and will be going to a headlight. Most of the time I'll probably run without it tho (road)
scott.parker
18-09-07, 09:05 PM
Will i know what you mean mate, my TB's are so F'ing loud!
you dont really hear the exhaust anymore, it flutters (if you know what i mean) compaird to when it ran std inlet it was more raspy and louder.
If i ever need to get the noise down i will make a box like Dar's as i have a massive ITG filter that was on the car before, and that will work a treat on the box.
Scott
Meh, it looks cool and will be going to a headlight. Most of the time I'll probably run without it tho (road)
I hope you don't mean without filters !? :eek:
Mines come out very tight to the bulkhead, so i'd prehaps check that before getting the box.
I had been thinking about how to get some air into the back.. i was just gonna do with a scoop and a raised bonnet at the back to promote airflow - And a bulkhead chop of course :(
i was just gonna do with a scoop and a raised bonnet at the back to promote airflow - And a bulkhead chop of course :(
Raised bonnets aren't all they're cracked up to be from what I gather. Best bet would just be the scoop that directs air down to the carbs.
I hope you don't mean without filters !? :eek:
Mines come out very tight to the bulkhead, so i'd prehaps check that before getting the box.
I had been thinking about how to get some air into the back.. i was just gonna do with a scoop and a raised bonnet at the back to promote airflow - And a bulkhead chop of course :(
....maybe...... but i have a plan
I want the trumpets as long as I can get, might even ditch the bulkhead yet.. dunno.
you'l deffo have problems with the bulkhead running longer trumpets and a box ;)
scott.parker
18-09-07, 10:35 PM
You wont be using that box if you run long trumpets mate, i cant see it fitting, so you would need to use another box.
Scott
lol didn't explain it very well, I'll have two setups, one for road, one for track. I'll have to have a play and a measure when the engines in for a test.
I am going to struggle and I dont even have a bulk head! Its that feckin strut brace...
http://img.photobucket.com/albums/v401/Foy/DSCF1714.jpg
Ash, and idea on prices of those pipercross boxes? Link?
as sai in emals, cut the brace out or use sock filters to give yourself the power edge lmao
Ash, why do you want the longest trumpets possible?
Will- I've looked for that pipercross filter on their site and its not on there !
I read about it it Performance Ford though so I'll dig the mag out when I get home.
Got a link to your build ? whats the cover by the cam pulleys ?
Havent put a build post together yet! Keep meaning to! I have enough pics! lol
Engine is a Toovey Built track engine....
Spec is as follows:
Head: (Coscast)
Extensive porting and CNC headwork, with stainless, one piece, wasted valves. 33mm Inlet, 29mm Exh.
Bronze Valve guides.
Double valve springs, with titanium caps and solid lifters.
Piper 296/300 cams
TurboSport adjustable pulleys
Cometic Head Gasket
Block.
Machined to 87mm with JE forged ?slipper? pistons.
Total Seal rings
Arrow Steel Rods
Uprated big end and main bearings
Knife Edged crank
Arp bolts throughout
Modified Swindon Race Baffled sump kit
Lightened flywheel/crank pulley
Injection
Jenvey/SBD taper 45mm Throttle bodies
Pico Injectors
90mm trumpets
MBE 967 Management
Thats a very nice spec there.
Ash-Just run filter-less. 38mm trumpets are a good length.
Nice spec, I presume your looking for 250 + from that ?
Hope you have a good gearbox installed as you'll need it lol
What is the backing plate all about ?
Gearbox is a recon F20! :) I am guessing (and hoping) that its the torque that tears them up, in which case I will be fine. I know that F20s are reasonable on LETs that are standard ishlol
I will be happy with 220 + all I know is it still requires as much fuel at the limiter as it does at 6000, so will be interesting to see how high I need to rev it! :D
What backing plate??
I have looked for the pipercross box and it seems that the max ram pipes you can use are 45mm!! :confused:
You need the type of thing Lee Hearsay(sp?) off mig had/has.
http://img.photobucket.com/albums/v86/Nova-crew/03032007086.jpg
Ahhh, so it sits halfway up the trumpets... I will go and send him a PM...
put teabags in the trumpets. that will quieten them down.
Ahhh, so it sits halfway up the trumpets... I will go and send him a PM...
I dont know if that was something custom he made, or off the shelf item.
Hes put a pipe from the box intake to a air duct built into the passenger side headlight.
Looking at another pic, it looks like he made some extra mounts to make the baseplate sit halfway up the trumpets.
http://img.photobucket.com/albums/v86/Nova-crew/03032007087.jpg
That exactly what i'm going to do^^^ Might have to read his thread.
@ Stuart: If what I have read is correct, then longer trumpets will improve torque....?
@ Stuart: If what I have read is correct, then longer trumpets will improve torque....?
Yeah but can reduce power.
Just how much of a increase im not sure whether even noticeble.
IIRC Lee did buy that and I am quite sure that is the pipercross one.
He only mounted it that way as to fit it their way you need shorter trumpets and as mentioned you'll lose torque.
Which you can't afford to on those shonky small blocks lol ;)
Still looking for a solution!
Looks like I will have to 'make' something!! lol
I had this made up a few years back. Works a treat.
http://img.photobucket.com/albums/v485/DPursey/DSC03820Small.jpg
http://img.photobucket.com/albums/v485/DPursey/DSC03823Small.jpg
http://img.photobucket.com/albums/v485/DPursey/DSC03822Small.jpg
http://img.photobucket.com/albums/v485/DPursey/DSC03825Small.jpg
scott.parker
21-09-07, 09:04 AM
Dar i will say it before anyone els dose..
How will that keep an even amount of air being displaced to each trumpet, as the opning where the air comes in is over just the one/first two trumpets etc..
Im sure you have a good answer.:)
Scott
dhdev (Oli)
21-09-07, 09:28 AM
Dar i will say it before anyone els dose..
How will that keep an even amount of air being displaced to each trumpet, as the opning where the air comes in is over just the one/first two trumpets etc..
Im sure you have a good answer.:)
Scott
Seeing as you're a country boy - Imagine that the airbox is a water trough, with a tap at one end (inlet) it doesn't matter where you take a bucket (cylinder) full of water from as the water will always spread to fill the trough.
So on the airbox, as long as the box has a greater capacity than one cylinder and as long as the inlet is large enough to fill the box back up between inlet strokes then it doesn't particularly matter where its positioned.
I believe thats all true to a degree, without going into flow paths and pulse wave type stuff.
scott.parker
21-09-07, 09:38 AM
Seeing as you're a country boy - Imagine that the airbox is a water trough, with a tap at one end (inlet) it doesn't matter where you take a bucket (cylinder) full of water from as the water will always spread to fill the trough.
So on the airbox, as long as the box has a greater capacity than one cylinder and as long as the inlet is large enough to fill the box back up between inlet strokes then it doesn't particularly matter where its positioned.
I believe thats all true to a degree, without going into flow paths and pulse wave type stuff.
Well i only though i would ask as i can remember Dar had loads off different people asking this question last time he posted a pic of it Oli.
"country boy" lmao lol think your getting me mixed up with neil ;)
Scott
Dar, looks ace mate... any chance I could borrow it?
;)
Well i only though i would ask as i can remember Dar had loads off different people asking this question last time he posted a pic of it Oli.
"country boy" lmao lol think your getting me mixed up with neil ;)
Scott
also as its not forced induction it dosent matter (I asked at the time before fully getting my head round a plenum for N/A use lol)
If it was a turbo inlet then yeah 1 and 2 would get too much air and 3/4 would be a little undersupplied.
scott.parker
21-09-07, 11:43 AM
Well i remeber there being a few quetions asked about it last time Stu,so i though i would ask first, hoping Dar would answer straight away,lol.
Scott
Done a trackday this weekend in Ads nova, 118db !
Luckily I managed to blag it for the short amount of time we were on track but it needs looking at lol
118?? lol
I guess thats where mine is too then!
Was that Donny? How did she perform?
craig green
03-12-07, 10:47 AM
Jeez. 118db isnt shy!
That was a static test @ 4500k LOL
Car performed ok, that was until I hit a landing light and wrote a wheel off, oops
It was at RAF Woodbridge so no drive by sound test but no fooking way it would of passed that. I have the packing to redo the backbox, I thought it looked ok when I checked last week but obviously not.
Geometry is miles out for some reason, getting it checked then got Donny on the 27th, had to run a base map until it goes back to the engine builder this week so power was a bit lame too :(
The only thing I wanted it to do well was go round corners and sadly I was being hassled by everything in the bends, fingers crossed I'll have it sorted for Donny as there is loads of people I know going so it needs to make a bit of a impression
craig green
03-12-07, 01:11 PM
Adam Moran's Nova yeah?
Hope the written off wheel didnt do any more harm? Any pics of finished car?
Yes its Ads car, there is no other visible damage but I'll be having a good look over it later this week.
The car is unfinished as all projects cars are lol its on useable now though, made 222 hp @ 8640 at Track and Road, it will be back there within a fortnight after the cams are changed so we should see 230hp with the power not being so peaky.
Pics as requested although you may have already seen these :
http://img.photobucket.com/albums/v306/Jatec/adnovamoving.jpg
Not sure why the Stack looks pished in this pic but its fine now lol
http://img.photobucket.com/albums/v306/Jatec/stacknight.jpg
http://img.photobucket.com/albums/v306/Jatec/adwiring1.jpg
http://img.photobucket.com/albums/v306/Jatec/tnringnova3.jpg
I've got a few from the trackday I'll post later
craig green
03-12-07, 02:10 PM
Thanks mate. Mad R/R figures.
Thanks mate. Mad R/R figures.
Tis mad on the road, destroys my mates 375hp 3 door cossy on acceleration.
170mph flat out in 5th though is quite useless :eek: lol I have seen 8400 in 5th though when Ad and I were in a hurry to catch a ferry which is 160 ish :thumb:
craig green
03-12-07, 02:18 PM
On a private road I'm sure..
Will have a looksie for the engine spec. That sounds crazy!
Yeh it was a shortcut through a unused RAF base I know of lol
Engine spec is :
.5mm Accralites
Cat Cams steel rods
Lightened and Balanced internals
Lightned flywheel
SBD Oil pump
Baffled and gated sump
Cometic 1.9mm head gasket
Blydenstein cylinder head
QED Solid lifters
QED double valve springs
Titanium retainers
QED 450 cams
Jenvey tapered throttle bodies
MBE 967 ecu
Simpson race manifold and system ( noisy fooker )
I thought it would be intresting to look up what else is 118db and a stadium packed full of people is 117db lol
My car is 94db and is the same as a Power Lawnmowerlol Figures!
Holy FOOK !!!!
I'm not convinced it wasn't the exhaust ressonating (sp) causing it tbh as I swear its not that loud, I admit its not quiet but 118db is fecking loud and on the road the tb's are far louder than the exhaust lol
How may boxes have you got in your system Dar ?
When this exhaust was made it was tested at 92db on a similar engined nova
BRoadGhost
03-12-07, 03:54 PM
http://img.photobucket.com/albums/v86/Nova-crew/03032007086.jpg
The design of that airbox is all wrong.
It should taper the other way.
How may boxes have you got in your system Dar ?
When this exhaust was made it was tested at 92db on a similar engined nova
I have three boxes on my system.
Some piccys
http://img.photobucket.com/albums/v485/DPursey/2007%20Mods/IMAGE_00063.jpg
http://img.photobucket.com/albums/v485/DPursey/2007%20Mods/IMAGE_00061.jpg
Also there is nothing wrong with the air filter(As i'm sure you already know). I run a similar one on mine.
http://img.photobucket.com/albums/v485/DPursey/2007%20Mods/DSC07725_800x600.jpg
3 ! I think we may need to scrap the Simpson system and make our own :(
Looks good though mate.
Regarding the airbox, in a forced induction situation that would be totally wrong but on a atmo engine I doubt there is any problems
I went for three just to make sure it was as quite as possible. It's so annoying getting pulled off of track for just noise.
Where did you get the boxes etc.. to make that system Dar ?
I think the Simpson is 2 3/4 straight through !
Yeh it was a shortcut through a unused RAF base I know of lol
lollollollol
I got it made by a custom exhuast place just down the road from me. Mines 2 1/2"
scott.parker
03-12-07, 06:07 PM
Where did you get the boxes etc.. to make that system Dar ?
I think the Simpson is 2 3/4 straight through !
2 3/4 :eek: STRAIGHT
Fook no wonder! lol
smcgsi16v
03-12-07, 09:04 PM
Not surprised its that load.
I just done a track day today at Colerne and mine read 82.7db. Whisper quiet compared to that.
Its a massive system, infact so big I had a nightmare chopping it up to get it over the beam.
The problem was that it was made for a Nova "evo", the rear bumper stuck out 10 foot and obviously Ads is factory (ish). Getting the huge backbox to fit without chopping it up was a nightmare and to this day I've never been quite happy with how it is, considering the noise it makes it now has to be changed asap.
I think this exhaust will need to be kept though for no noise limit days as it does sound kind of sexual at 8800 lol
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