View Full Version : Which is better, tuned t40 engine or tuned mpi engine?
Hey, i was chattin to a lad at the weekend and he was saying that his dad dose engines and that he will swares blind that you can get alot better bhp gain and responsive engine from a mpi tune up than a t40 tune up.
Whats your views?
Cheers Lee
depends if the mpi is on tb's
Mpi dosent need TB's lol.... The touring cars run plenums etc :p You can get loads of power from the inlet +TB on a 1600 and mappable management to get rid of the AFM..
Its "easier" to slap a set of carbs on and get good power. but for "proper" power management it the way forwards but quite a bit more costly etc
Fuel injection betters carbs in almost every way, if you have the money to get proper management.
You can get 150+bhp from a Nova gte engine with MPI, using aftermarket management.
But the cost of the aftermarket management is the problem.
Personally i would rather have std MPI than mess about with carbs trying different chokes blah blah.
MPI, you just start the engine and let the ECU take care of everything :)
I've never drove a car with T40s tho, my opinion might change if i did have a go in one :)
hopefully by the summer, i will have my corsa sri with the 1.6 mpi in, and my nova sr project with a 1.6 t40 set up in, im expecting a difference! not sure on bhp outputs though!
Probably around the std 100bhp for the MPI, maybe less if its an old engine.
And around the 120-130bhp mark with the t40s, if fitting a nice cam etc too.
My engine is a rebuilt 1300sr bored out and 1200 head p&p. he said that for about 1500 he could put the mpi system onto it and run it to 110bhp. he then said if a was for payin 2500 he could run it at 130bhp. at this point i wasnt sure to believe him or not so i thought i would ask u's lads for ur thoughts.
so crazy power figers on mpi can really be using TB's but what sorta money would i be lookin to be payin for a set?
cheers lee
basicly i was all set to stick on t40s but this had made me think more about changing to mpi. need more info before i make a decision on what to go with
cheers
lmao what a con on the cash front!
you dont need ITB's to get big power, you jsut need a correctly designed plenum and single TB setup...
Aragorn
31-01-06, 07:25 PM
and much more importantly correct mapping
bruces relatively mild engine makes 146bhp on MBE management, it would make more, but we cant rev it any higher due to still having hydraulics, and the heads only had a mild port and polish so big valves etc would help out there
push the cams to the limit on solids and more headwork and over 160 is possible
SBD's 1.6 16v kits are a prime example of the carb's issue, they make 160bhp on ITB's and 140bhp on carbs, the reason being to get a decent drivability with the carb they need chokes which cause too much of a restriction at high rpm so power loss occurs
My engine is a rebuilt 1300sr bored out and 1200 head p&p. he said that for about 1500 he could put the mpi system onto it and run it to 110bhp.
cheers lee
For ?80 tho you could fit a GSi engine with a de-cat and get the same power :thumb:
you say ?80, yet its costing me almost ?700 for that conversion!
are you paying GM to do that conversion? lol
lol, na, some local body repairers were i take my cars for anything!
you say ?80, yet its costing me almost ?700 for that conversion!
Lol.
It would cost you ?80 tho, if you found a complete engine, loom etc.
And fitted it yourself. ;)
lol, not going to be stickin in a bigger engine, the 1300s going in. its just how to run it thats causeing me the problem. so for a extra few quid yous would say that the mpi would be the route to go?
O and the cars i have to beat or at least scare are a 104bhp MG ZR, 110bhp VTEC Civic and a 110bhp HDi 307. They laugh when i tell them to be carefull about the novas lol
just slap on a nitrous kit then lol
the cars i have to beat or at least scare are a 104bhp MG ZR
:wtf: Hmm i find that very hard to belive, my mates paxo VTS struggled to keep up with 1 of them yet it pissed on a corsa GSI :confused:
There only a 1.4 mpi engine. for a fresh car i would of thought it would of been more.
1.4 16v them mg zr's.... i dont see the point in geting thw 1.6 version coz its only got 110bhp..5 more then a 1.4. do they do a 1.8 version
yea, theres a 1800 at about 120bhp
thirdeyeblindman
02-02-06, 04:44 PM
as stuart has said you can get big power from a plenum, but it as total expense of drivability and idle quality.
my pal does a lot of elises and they are night and day different from the plenum to the tbs, yet peak power is same. and yes both are mapped right, as he is DTA trained
Nah the 1.8 MG shedR`s are 160`s nut theyre all K-series engines so theyre made out of chocolate n go bang after a bit of mild abuse lol!!!
i never said you lose idle/driveability :P any half decent mapper can get them to run sweet and also lairy.
thirdeyeblindman
02-02-06, 11:05 PM
not with good cams... talk to people who actually do the work and not people that only talk about it
a K on a plenum idles like feck all with Piper 300 cams... and it cant be sorted coz car originally came from emerald.. maybe you should tell them that they cant map properly with all your experience.
As for reliability... this tuner has 220bhp from a 1700cc K and its now on its 4th season and revs to 9200rpm... if your blowing them up, your engine builder is missing something
So then Who are you..... ;)
Snowface
03-02-06, 12:43 PM
1.4 16v them mg zr's.... i dont see the point in geting thw 1.6 version coz its only got 110bhp..5 more then a 1.4. do they do a 1.8 version
i'm guessing they gave the 1.6 a bit more torque than the 1.4.
power figures arn't the be all, and end all.
thirdeyeblindman
03-02-06, 04:05 PM
pm me and i'll tell you the tuning companys name but they may tell you to piss off and they are really busy at this time of year and have to be talked to nicely to getthem to do any road engines. They are very involved in british superbikes at moment and i suppose that pays their bills
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