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LotusGTR

By LotusGTR,
in Engines & Forced Induction

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gtr fan Experienced

gtr fan

Posted
Posted

Did you manage to sought out the idle issue. I have a similar problem run rich and idles fluctuates between 1-2k. Power fc and boost controller was fitted for a few years befor this started but I am suspecting vacum issue as well.

Is that what yours turned out to be?

LotusGTR Veteran

LotusGTR

Posted
  • Author
Posted

When the engine was built they cleaned the throttle blades and without the carbon deposits and the fact the teflon coating is now worn off (over the years) it idles high. Very annoying. Power FC has made a difference but still 1100-1200 minimum. Needs to have the blades re-coated to sort it out. Expensive and fiddly job for no performance gain so hasn't happened.

gtr fan Experienced

gtr fan

Posted
Posted

Yeah mine use to always idle at 1200 but the last few times I have driven it, it has been playing up. Another theory I was told was that the inlet manifold gskets could be leaking, which can also make it run a bit more rich. Trial and error I guess.

JimX Grand Master

JimX

Posted
Posted

+1 for exhaust manifold porting around the turbo flanges to match the upgraded turbo flange size. I did mine at home with a Dremel at home (die grinder would have been much quicker but I had nothing else to do at the time anyway) and it could have possibly been the best bang-for-buck mod I've ever done. I'll never know for sure though, because I did it at the same time as I upgraded the turbos so I couldn't do any before/after testing. But it doesn't make any sense to put bigger turbos on without increasing the turbo flange size on the manifolds to match. I have seen a photos of stock and Nismo manifolds next to each other, and the only difference I can see between them is the turbo flange size. So I presume that I have basically done a free upgrade to Nismo manifolds.

Also with your idle problem, have you adjusted the screw thingie underneath the plenum? Mine used to idle around 1200 as well (I think for pretty much the same reasons yours is) but I managed to get it to normal (before I got my PowerFC) after someone on the forums told me about this adjuster screw under the plenum. The thing is if the adjustment is maxed out then you'll have to try something else. I forget all the other details because it was a few years ago now, but searching the forums should turn up my old post about this issue.

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