Hi guys first post here, i'm on my second coop now and have been modding it over a period of time. I had it rolling roaded the other day at 388bhp, I'm on the standard engine and want to track the car but want it to survive, has anyone run similar power and had no engine issues with it. Cheers Phill

Ill probably be corrected but im sure 350bhp is right on the limit of the standard internals?

Think 350 lb/ft is. Who mapped it? on track will get hotter charge temps and mapping becomes very important.

yes you are over the limit really 350 is pushing it so you are over for sure and if you are going to track it then you wont want to run it anywhere near its limit if you want to do more than a lap or two.. what turbo are you using and at what boost is it producing 388 what are your supporting mods?
i have run 358 with standards but it was as safe as it could be with the mapping and supporting mods..the car stil runs well with its new owner while i am building a 450+ forged effort

Thanks for replies, the cars not been mapped i'm using a gtec2 and additional injector mounted before the throttle body to get the extra fuel in, the turbo's a t34 turbo running 22psi. I'll play it safe and back the boost off abit.

oh dear..............a 6th injector? wtf???

you really need to get it mapped asap and before that turn the boost down!

I think audioguys sig sums it up really

t34 on a 20vt.... That's different!
what were your torque figures and what size exhaust housing you using... 63 a/r?
impressive power from the old turbo although you should go see flea and get proper map done.... I'm assuming the turbo is just old style journal bearing and not rollerbearing?

i'd be interested to see your dyno print out as i'm also running some type of t34 on my rebuilt 16vt... Mine is old school journal bearing tho!

nick

Whatever you decide to do, I'd get saving some pennies for a forged build then you can push it as far as you want. Dont expect the standard engine to last forever at that power level but it might be alright if you dont drive it on the limit all the time.

you really need to go to fc performance (on traders section here) and get it mapped he will make it as safe as it can be and give you good advice as well..good luck with it

As KTM says - what is the full mods list.....

An unmapped car running that power is asking for it to pop IMO - and that is on the road. On track you'll be going home on a trailer......

In answer to your question no one I know has run that power through the standard engine without it going bang shortly after.

The rods will stand 350 lbs /ft, but the stock pistons wont like the 1.5 bar you are putting through them - even with optimal fuelling in the long term.

I would be very interested in seeing a dyno graph from a T34 turbo'd coupe.

The turbo is a journal bearing with 0.63 exhaust housing and 0.60 on the compressor side , torque is 340lb/ft i'll post the rr print out if I can figure out how to do it.

it will be interesting to compare yours and say.... Technics's dyno print out... Think your running similar power!
it will be interesting to see how much difference on spool up there really is between old and new turbos?

nick

Was the previous owner on here?

Full mods are

T34 turbo
Big front mount intercooler
Full 3" exhaust system
3" induction pipe
Gtec2 hf
Greddy rebic IV controling extra injector
CG motorsports clutch

Is it just the pistons and rods that become an issue, i've played about with other turbo cars and ended up with burnt out valves, blown head gaskets, knackered valve guides etc. Cheers

Not sure to be honest i've had the car for about a year, it had been abit neglected the guy seemed glad to get rid of it

pistons mostly but if going to put them in you might as well do rods as if you decide to go bigger you will need rods

The 20VT has a decent head gasket on it - unlike a lot of the Jap stuff - no need to change it.

Very few issues with valves - they are sodium filled as stock.

Pistons will be the main issue - and the stock rods will be fine with what you are running unless you plan to go for more at a later stage.

if you limit the boost to 1.3-1.4 bar then the stock pistons will not go in five mins, but they wont last they way they would on a stock engine.

Your biggest issue is going to be the fuelling - if your rolling road has a printout of it then post it up so we can have a look.

You would be better off with bigger injectors and a live map - but there are plenty of cars that run an extra injector, some consider it a bodge - some dont.

There is nothing wrong with the old t series turbos, just most people on here run hybrid T28's or GT series turbos as it been done before.

There are plenty of people that vouch for the T3 and T4 turbos as being far more reliable than the GT turbos.

Are you running a high flow fuel pump?

If it works here's the rolling road print out.

It looks like the car was only run to 6,000 rpm and then coasted down?

There is no fueling trace on that printout - do you have one?

That's the full run Si, you can see it hit the standard 6800 limiter.

With a remap I could find you torque across the full rpm range i.e. 10+lbs/ft off boost, 20-30lbs/ft in the mid-range, quicker turbo spool and the same power for less boost at the top.

No need for a 5th injector either!

I would have thought torque would hold a lot better than that - it just seems to peak and then drop off?

if that does't tempt you you must be a trappist monk

and all safe to boot!

go on you know you want to

or must do really

I've got a wideband on the car so I can see that its getting the fuel in there, the rolling road guys got one but I dont think he can load the run on to the graph.

The power and torque drop right off but it doesnt feel like that on the road. I'm going to go back in a week or so for another run, i'm also using the standard airbox and panel filter which wont be helping i'll try a k&n on it.

I'll have a look into having it remapped I know it'l run more smoothley just depends on the cost.

Ok - so what is the fuelling like?

Between 11.5/1 and 12/1 on boost.

That's about right if it is between those two values throughout the rev range when on boost.