Engine rebuild results

[Junkers]

Hey guys

A friend and I just recently rebuilt my engine and had it on the dyno to see what the G63B can push out with a standard ecu/tbi injection, thought I'd share the results.
While rebuilding the engine we got rid of the balance shafts and used Ts pistons, we also dropped in a very mild sports cam and the turbo is a mix of a 14b wheel with a 070 exhuast housing and a standard compressor cover.





On the first run at 13psi the engine developed 200hp atw but the AFR was running lean by miles, peaking between 14-17:1 so we reduced the boost to 10psi and made a safe 180hp atw / 274 Nm, 12:1 AFR.
The guys at NZEFI reckon with a stable map @ 13psi, the engine could potentially make 220-230hp atw as it was very responsive to boost increase.



Also bumped into this little beast while I was there.





Comments appreciated :)

[Barney]

Great result

Maybe with a programable ECU and a MPI system it will go even better.

How does it drive?

Ash

[Junkers]

It's pretty good to drive, power seems to dive off by 5000rpm though, not sure if it's the cam or possibly the coil.

[boosted]

which year is this model?
As a friend is running a 89 model with a rather large turbo at 12 psi and it`s more on the rich side.. Is there such a big difference between the early 2,6l models and the newer ones?

good looking stazz :beer

[redzone]

thats a 2LT, boosted, so pretty much the whole setup is different. what works tuning a 2.6 may not necessarily work on a 2.0!

and this one's a 86 i think, narrowbody. your friends one would be a widebody yes??

[RiceThief]

Good results Junkers, do you have any advice or tips regarding rebuilding the engine?

[boosted]

Uups , my mistake.
Don't know how this hapened, thought it was a widebody!!!

in this case, a good result for the stock tbi!! well done.
Are you still using the original pump and fuel pressure regulator?

Adil

[Junkers]

It's a 83 GSR II with a few cosmetic bits off a later model, the air dam is one of JAS's.

Ricethief:
Get rid of your balance shafts while you have the chance, higher static comp pistons are desirable too.

Boosted:
Yes the fuel pump and fuel reg are standard, we tested the fuel pressue and it held it's pressure even at 13 psi. I think it comes down to the injectors/ecu which will be next on the agenda.

[boosted]

what you think, possibly a rising fuel pressure reg. and a stronger pump could work against the leaning out at higher boost levels?.

[Junkers]

what you think, possibly a rising fuel pressure reg. and a stronger pump could work against the leaning out at higher boost levels?.

Most likely not. The fuel pressue has been checked and is at a good level at 13psi, I think its more ecu - injector related.

[RiceThief]

I think you could have run higher fuel pressure with a rising rate fuel reg to get more flow out of your injectors. Some people do that as a bandaid solution but the only issue is you will run rich in areas that weren't lean before.

Do you just use the clearances that the piston manufacturer recommended?

[Junkers]

Yea I probably could use a rising rate but the engine already runs rich throughout the mid range so I'll just hang out for mpi.

Clearances? As in ring gapping?

[bigd]

Good work. Is that front bar the whole bumper and lower lip or just the lip?

[madeofmilo]

with 200hp at the wheels it must be a joy to drive! Congrats mate glad to see it worked out for you :beer

[Mitsi God]

Great power figure with the standard injection! whys the torque figure so low?