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Modifying 2002 250 Gt


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Hey there, I've been thinking of modifying my Skyline 250 GT. Does it share the same head design as the VQ35DE's?

Also, does it share the same internals as the Stagea's VQ25DET? Thinking of doing a low pressure turbo. Unfortunately

can't find any Stagea halfcuts here in Malaysia; unless I can get the bits I need shipped from Australia. And if it's a straight

forward ECU swap etc (one can dream).

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Have to say I was very disappointed to find out that they made Stageas with the same engines in turbo form... why not the skyline? This is obviously why they will never be a desired import...

I'd do the stagea engine transplant... AND swap all the front panels too

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  • 2 weeks later...

Custom fabbed a pair of 2.5" decat pipes for the 250. Due to the increased airflow can now clearly hear the empty resonator and muffler rasping tinnily. BTW 350Z cat back exhausts aren't feasible, the fuel tank is at the rear below the boot and 350Z style mufflers will not be able to fit; it's possible to fit two N1 style straight-through mufflers on each side but it'll be way too loud for what I'm aiming for.

Also, the resonator (midbox) is ridiculously huge. And flat. Curves around the prop shaft for a good 3.5 feet. I'll have to repack it; any replacement resonators, even box types, would make the exhaust boomy :/

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I have some spare VQ25det manifolds here, and you could perhaps find a spare VQ25det or VQ30det turbo floating about in Japan to straight bolt up? How would you tune in the extra fuel though?

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Well not familiar with tuning direct injection...can e-Manage handle it? :P If yes then I'd be very interested in the manifolds; a turbo of similar spec can be sourced hehehehhe

edit: on second thought, I can just fabricate a manifold. Labor cost is cheap here in Malaysia. It's the direct-injection that's a pain though.

Edited by beercat
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Yeh, not sure on the direct injection.

You wont be able to source a turbo anything like the Stagea one, lots of fabrication with bugger all room. Better to go stock unless you can get the work done for nothing.

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Yeah not looking at a dual muffler setup.

Bleh. Put in a bottle of Redline SI-1 Complete Fuel System Cleaner and it started to run super rich. Idle started to get funny, after a few minutes at idle, RPM rises to the 1.5-2k range and it's effectively in limp mode where full throttle will get you to 2-2.3k rpm. ECU is throwing a P0175, Fuel System Rich (Bank 2). Restarting the engine gets rid of this and it's ok to drive around, just not idle for long. The exhaust gases at idle are tear inducing, and almost smells like paint thinners.

*Oh, and under load it spews out lots of white smoke. It's not eating oil though so I'm hoping it's just unspent fuel.

I'm hoping it's because the additive is cleaning/causing havoc and in a tank or two will clear out. Anyone else have this problem before?

Edited by beercat
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