View Full Version : What gives better bhp-twin 40's or uni-chip?
I've got a H-plate gsi and am not sure which road to go down-uni chip or twin 40's. They're equally as expensive but which would give better bhp gains?I was thinking that twin 40's would but carb's are abit of a step back in technology from injection surely? Abit worried about twin 40's drinking my petrol like there's no tommorrow aswell, but with a uni-chip it can be mapped for optimum economy and performance. What do you reckon?!?!? :?:
If you want power then the T40's will deliver, the unichip can only maximise the injection to the mechanical set up of the engine, so it's no too much point mapping the chip till you have a cam, headwork etc... done to the car. If you want power and injection the Throttle bodies are the way forward, but will set you back a few G. Also it's owrth considering puttign a 16v head on the engine, that's a very positive set forward in power terms, and link to a set of twin 45's will see in the region of 140bhp.
Twin 40s all the way.
Unichip is pretty pointless on a standard engine.
Are there any 16v heads that'll fit straight onto a gsi?How much are you looking at to set it all up and stuff? Its not completely standard- i've got a 4-branch and full magnex system, k&n , modded throttle body and afm. All i want now is a cam and i think i will go for twin 40's- i've heard bad things about throttle bodies....
Philsutton
21-05-04, 05:20 PM
go twin 40's even if its for the sound alone
-Bruce-
22-05-04, 11:59 AM
go twin 40's even if its for the sound alone
yes!! :lol: :lol:
bruce
TB's sound the same as carbs, but with more midrange power, and amazing fuel economy :lol:
If you want a 16v head, then go buy a whole 16v head and block as is, stick some ARP's in it and then a set of carb and igniotn management, all in about 1500, but you'd be knocking 145ish then head work to abotu 150. I run a 1.4 16v on tb's I've had no problems with mine at all.
Philsutton
22-05-04, 05:16 PM
tb's also cost a sh*t load more than carbs. For the cost of carbs and the power they give i'd cetainly go for them and i have.
Plus you'll never get bored of dropping down a gear and booting it past old ladies so they drop their shopping, haha
But the fuel economy of TB's soon makes them pay for themselves, also that you can map them in th emidrange means tighter fuelling and better drivablity. fair enough TB's cost 1500 all new, and carbs would be in the region of 500-900, but you get what you pay for at the end of th day. And fuel injection is the way forward. 8)
-Bruce-
22-05-04, 06:40 PM
Plus you'll never get bored of dropping down a gear and booting it past old ladies so they drop their shopping, haha
phil your a nutter!! but it is good :lol:
bruce
2nd hand carbs go for between ?200-?400 + manifold, never seen 2nd hand tb's
i got my old 40s for 80 quid with a linkage and they worked lovely. 45s are very dear tho but on a 1.6 40s are fine. the sound is awsome. also a unichip will do fek all to a GSI engine
puts my engin ein to contrast in cost terms then :o total build is fast approaching 2500 now
esp when the fact your engine is almost the same cost as my whole car including car purchase lol
T40'2 it's gona be! Apart from the carbs what else do i need? I think i need a different alternator bracket? And someone said something about the distributor from a 1.4sr? T40's for ?80!?!?! :o
T40'2 it's gona be! Apart from the carbs what else do i need? I think i need a different alternator bracket? And someone said something about the distributor from a 1.4sr? T40's for ?80!?!?! :o
to get the most out of them, you'll want some headwork and an uprated cam aswell.
Jim
Should have a cam soon and i'm not sure about headwork-sounds abit expensive?Would i have to get my cylinder head off aswell?Coz i don't really like doing major engine work coz i could fcuk my whole engine :cry:
By would I have to get my cylinder head off i mean take it out the engine and send it off? :?:
johnny27
25-05-04, 01:01 PM
Best to pick up a spare 1600 head to modify, shoud'nt be hard to get. So you can drive your car in the mean while. Head work is'nt that expensive, you will need it for the 40s to make any real difference. Got my 1300 head ported inlet and outlet, polished, skimmed and the valve seats back to orginal good condidtion all for ?150, i don't think you can modify the valve seats much becasue of the the water jackets being to close, maybe wrong though. Don't forget the essentals like getting new valve stem seals when your at it, shame to do all that work and being laughed at with the car blowing clouds of blue smoke lol. Yeah you'll need a new lowered altenator bracket cause the altenator gets in the road of the carbs. Good luck
Where did you get that done matie?Did you post it off to someone? Anyone know what sort of bhp you're looking at from a 1.6, 4-branch, k&n, full s/s magnex system, T40's, cam and head work? I'm thinking it'd be about 135-140bhp? Does anyone reading this do headwork?if so p.m me! :D
johnny27
25-05-04, 04:31 PM
Got that done locally here in Northern Irealnd, done by an ex rally boy
johnny27
25-05-04, 04:38 PM
B.T.W if your getting close to 140, you might need to look at your bottom end (the engine i mean lol:) Not sure if crank bearings and conrods would be happy, last thing you need is a leg out of bed. Anyone else have any advice about this, i may be wrong though
135-140 may be a bit optimisitic. Dan's engine produces 140bhp at the flywheel. This is the reading of Velos motorsport. Most people who have used them belive they give realistic figures. You may find you get over 140bhp, it all depends on what rollers you use.
As to whether or not you could achieve this figure is a different matter. Look at Dan's technical specifications in his feature:
http://www.novaload.net/features/viewfeature.php?ref=207
This will give you an idea of whats involved to get the most out of these engines.
Jim
P.S. It can get expensive :|
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