Less Power Then Stock

[Olly]

Hey people, anyone with any ideas on this topic would help.. im driving an r33 gtst with a trust fmic and forward facing plenum chamber and a greddy emanage which are the main mods... stock turbo, recently had it on a dyno to find it had 139.9 rwkw... which is kinda a swift kick in the nuts since its running 12psi... the ignition coils are fine.. air/fuel is good.. exhaust is a 3" front pipe to a 2 X 2.5 cat back system. fuel pump is a walbro pump of around about 500hp... when you drive it you put your foot down and it just doesnt really go anywhere like it should, i seriously think i could run quicker... but theres no missfire or anything.. just no power. theres a broken knock sensor snapped off in the block but i've been told the emanage bypasses that (hence why i baught it) and i beleive it has... any idea whatelse to look at as too why im about 40/50 rwkw shy of what i should be?? only thing i can think of is maybe the timing..

[Bluprint]

How many kms on it?

Get a compression test.....

[Olly]

just rolled over 100 thou..

[fEkuaR]

just rolled over 100 thou..

do a compression test on the cylinders and check if the bottom end is still healthy.

[Trav33]

I had my car on the dyno the other day, and knew previously it had run 185kw. The dyno showed 140kw, and the dyno operator was saying 'wow, thats a good result'. He was clueless and thought it was an RB20, not RB25.

Anyway, my timing ended up being WAY out, and that was causing power problems. was -4 deg (retarded), and we moved this to -12 deg to run 195kw.

I wonder if timing could be your problem?

[BAMR33]

Get a compression test.....

x2

[moonus]

check ur boost lines, turbo, pull of ur cat and check its not blocked, check ur intercooler piping, BOV leaks, timing.

[R31Nismoid]

After the comp test, i would look @ the tune and parts that have been fitted

There are other things like the plenum etc that could be the issue... as most of the stock parts easily get you into the mid 200's

Exhaust might be restrictive aswell or the cat has collapsed.

There are lots of options

[Adriano]

100,000k's eh, did it just have a timing belt? Check the cam timing whilst your at it.

[VB-]

comp test X3

timing belt/cam timing

check all sensors are working except the ones u dont need like knock etc (could just have an electrical gremlin somehwere)

tuning - where did you get it done? take it t a reputable tuner

what dyno/how was it run?

Edited December 26, 2006 by VB-

[CefiroBoy]

kinda off topic but, what is the factory cam timing for an RB20DET????

ASAP! lol.

Cheers

Jay

[khunjeng]

Hey people, anyone with any ideas on this topic would help.. im driving an r33 gtst with a trust fmic and forward facing plenum chamber and a greddy emanage which are the main mods... stock turbo, recently had it on a dyno to find it had 139.9 rwkw... which is kinda a swift kick in the nuts since its running 12psi... the ignition coils are fine.. air/fuel is good.. exhaust is a 3" front pipe to a 2 X 2.5 cat back system. fuel pump is a walbro pump of around about 500hp... when you drive it you put your foot down and it just doesnt really go anywhere like it should, i seriously think i could run quicker... but theres no missfire or anything.. just no power. theres a broken knock sensor snapped off in the block but i've been told the emanage bypasses that (hence why i baught it) and i beleive it has... any idea whatelse to look at as too why im about 40/50 rwkw shy of what i should be?? only thing i can think of is maybe the timing..

when i first got mine I ran it up on stock turbo @ 10psi, FMIC, 3" cat back zorst and Emanage I ran 180rwkw...The plenum probably wont add much with ur power levels..

Should should be the same if not better than that result.

[Olly]

Thanks for all the advice fellas. im taking it over to melbourne now in the middle of feb for someone to look at.. no mechanics down here would have half of a clue what to look for... cant think of the name of the place im going too off the top of my head but i have one of the head fellas of autobarn in melbourne helping me so hopefully it can be fixed just by tweaking something on the dyno. if i had a light i'd check the timing myself but i cant really be bothered at the moment... once again, thanks for your input