Need Help Rb20det Power Stop Dead At 270

[legend01]

Hi guys

Just trying to get some ideas as to why the power stops so suddenly was tuned by hitman and he beleives there is an issue with power restriction beleives it to be exhaust or intake.I beleive it to be exhaust just purchased hks hiper 3.5" gtr exhaust which will be going on soon.looking for other ideas b4 next tune .

Mods Are

hybrid FMIC 600x300x76

HKS cams 264

hks Panel filter with CAI

hks cam gears

hks cast exhaust manifold

hks 36mm external waste gate

malpassi fuel pressure regulator

Sard 550cc injectors

Haltec E11V2 ecu

catco 700cfm catcustom 3' front pipe with waste gate plumbed back in b4 cat

garrett GT3040R

spitfire coil packs

Had trial tuning sprit 3" exhaust ( to be replaced with hks hiper 3.5" exhaust

cheers Peter

Edited March 14, 2006 by legend01

[RNS11Z]

Did you try wind more boost into it?

[legend01]

Has the same effect just wants to stay there

[Evan_R33]

will sound abit wierd but does it still have the rubber hose leading up to the air filter? i heard in more then a few cases of these sucking closed on boost completely robbing power. if you dont i would suggest a blocked cat convertor or similiar. would be wary of too much boost with this problem as if there is a restriction on the exhaust side of things you are gonna be pushing a lot of heat onto the back of those exhaust valves and may risk a bit of pinging......be careful.

[legend01]

Air box to turbo is 3.5" alloy intake pipe and the cat in brand new less than 500k's and stainless stell inside so i was told

[RNS11Z]

I would say either you have some air flow issue in the head (valves too small, cam timing?) or plenum or as mentioned exhaust issue. Even the cat is new, it can still hold you back. I put my money on that, remove it and watch the power climb.

I can only confirm it would be the cat is because when i sold my car to the new owner, with the cat in it, and more boost it wouldnt make any more power.

[paulr33]

do a dyno run with the exhaust dropped, you may find your exhaust setup is a restriction (likely)