darwin_evo

So we took the car to a local dyno, and it seemed to stop making power at the following timing/rpm:
6500rpm 12*
7000rpm 13*
7500rpm 14*
8000rpm 15*
8500rpm 15*

evo 9
boost: 42psi
turbo fp super 94
engine 2.2L

I don't trust the dyno as it's not properly ventilated, and it didn't seem to be always consistent. Timing seems a bit low to have reached MBT

any opinions?

Abacus

iTrader: (9)

The timing is in the ballpark. These engines do not need alot of timing, just boost and low back pressure.

I would check backpressure first. You could also lower the boost and see where it stops making power. Get an idea of what it makes at 36,38,40.

Some things to check are cam timing, leakdown, and inspect the turbocharger for any damage to the Compressor/turbine wheels. Cams size and head porting will also become a factor at a point.

darwin_evo

Thanks. Cams are S2, stock head/valves

LetsGetThisDone

iTrader: (1)

GSC S2's are way out of their range with that turbo lol. I would suggest moving up to S3's.

darwin_evo

Maybe R2's?

LetsGetThisDone

iTrader: (1)

Depends on how high you want to rev it. if you did a 153mm rod with the 94mm crank, it will do 9500rpm, and you should run S3's. If you're going to keep it below 9k, R2's might be th ebetter choice.


I would also suggest getting the head ported, it is also a restriction at this point.

RightSaid fred

Too much timing makes them break.


If the cams aren't flowing enough and are "out of range" then the VE will be low and it can handle more timing.

Better cams means greater VE and therefore it can't handle as much timing.



You'll know when you've given it too much timing, the cooling system gets over pressurised and something will pop.

ExViTermini

iTrader: (25)

So are you saying you suggest adding timing until it lifts the head, then backing it off?

Or do you advise actually using the tool that was created for this exact purpose?

RightSaid fred

Probably want a few degrees less.


You've got it back to front.
You pull back the timing and if the torque doesn't drop .....pull more.

SiriusEvo

How much power did it make? we made 973 on our Super 94 at 47psi dropping to 45psi at 9k.

what fuel? what AFR?

You are on a stock head with small cams. Power is in the head. Port that head, get some 280++ cams and let it eat

2winscroll

How much power did it make? What a/r?