SUPRALOOPY Posted April 4, 2008 Share Posted April 4, 2008 My taxi (r33gtst) is leaning out after 5000rpm on boost? Thought it was fuel pump but i have just replaced it and its the same? I reckon AFM but I ve been told these are good for 1 bar boost? I'm on stock atm due to the lean issue. Any ideas? Thanks Dave:( Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted April 5, 2008 Author Share Posted April 5, 2008 Pretty please. Link to comment Share on other sites More sharing options...
bignum Posted April 5, 2008 Share Posted April 5, 2008 Could be a few things really, like you say, afm,fpr, injectors clogged/dirty, vacuum leak between manifold/fpr, fuel filter? Link to comment Share on other sites More sharing options...
johnd-mkiv Posted April 5, 2008 Share Posted April 5, 2008 try borrowing another afm mate, if they are anything like the 300zx it will give you all sorts of readings Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted April 5, 2008 Author Share Posted April 5, 2008 Thanks john but from who? They all hate me on the skyline forum. not one answer from them. Gonna get the manual out and check the readings from the afm. I may also try upping the fuel on the safc2 just to see if it does the job as I know you should never add fuel with safc just remove it. But hey if it goes bang it goes bang!! LOL Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted April 5, 2008 Author Share Posted April 5, 2008 could it be lambda? as I have AEM only telling me whats going on and not telling the ecu whats its reading could the old lambda be fooked? Link to comment Share on other sites More sharing options...
kylestt Posted April 5, 2008 Share Posted April 5, 2008 how old is the sensor? could just be old causing bad readings Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted April 5, 2008 Author Share Posted April 5, 2008 gonna replace tha lambda. but I think I can use the wideband sensor to tell the ecu whats going on, as it has another wire to give out narrow band readings I think. Back to the books me thinks..LOL Link to comment Share on other sites More sharing options...
D8MOA Posted April 5, 2008 Share Posted April 5, 2008 if you had a toyota you wouldnt have silly problems Link to comment Share on other sites More sharing options...
johnd-mkiv Posted April 6, 2008 Share Posted April 6, 2008 Ill ask me mate dave as he has an r33 might be able to swap a few bits over to try Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted April 6, 2008 Author Share Posted April 6, 2008 cheers John Link to comment Share on other sites More sharing options...
RedM Posted April 6, 2008 Share Posted April 6, 2008 I reckon it's you lambada sensor leading you a merry dance. Link to comment Share on other sites More sharing options...
Swampy442 Posted April 6, 2008 Share Posted April 6, 2008 Id rule out O2 sensor personally, look at the AFM being knacked. Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 7, 2008 Share Posted April 7, 2008 1 bar is very risky on a GTS-t, you need to do the pump, bigger AFM, bigger injectors and a Power FC to do 1 bar and above, safely. They are very easy to blow up!! Conversely they are very easy to get good power from, done right. If you are saying it's going lean on stock boost pressure you need to monitor the fuel pressure under load. Could be the pump, could be FP control unit in the boot. Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted April 8, 2008 Author Share Posted April 8, 2008 could be FP control unit in the boot? Chris can you explain this in more detail? or is it in the rb25 engine manual, also can this be overidden or checked as the fpr I bought was a s**t one and is going in the bin. I was never gonna run it at 1bar LOL .9 max .85 most of the time. I have changed the pump for a 255 lph and its still the same. Thanks Dave Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 8, 2008 Share Posted April 8, 2008 Are you saying you have changed the fuel pressure control regulator to something other than stock? What? Why? My RB25 ran 460 BHP on a stock regulator, just fine. Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted April 9, 2008 Author Share Posted April 9, 2008 No chris, I have not changed anything in the boot apart from the fuel pump and the FPR I did buy was one of those ones with a gauge that replace the stock one on the return side of the rail, but that was rubbish and I'm now back to the stock one. What is this fuel reg in the tank then? and how do I test it? or as I said is there test procedure in the manual. Thanks Dave Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted April 11, 2008 Author Share Posted April 11, 2008 I've changed the pump. I have got a wideband and narrowband AFR gauge running (very well matched actually) I've checked voltage to the pump (14v) So that just leaves AFM I think? any ideas. I'm now on stock boost and stock FPR. Thanks Dave. P.s a thor fcd could not have anything to do with could it? Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted April 12, 2008 Author Share Posted April 12, 2008 Well I've been told I need an ecu? WTF stock boost with just a decat and induction kit. And I need a ecu? Great tunable car then? Link to comment Share on other sites More sharing options...
Steve Posted April 12, 2008 Share Posted April 12, 2008 Surely not? Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted April 12, 2008 Author Share Posted April 12, 2008 Grrrrrrrrr Why did I crash my supra. Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted April 13, 2008 Author Share Posted April 13, 2008 Resoldered the AFM and removed the FCD, now overfuels like a mofo and has a loverly flatspot and likes to kangaroo a bit LOL.. but at least its not leaning out anymore..LOL LOL LOL Thanks for all the replys. Dave ;-) Link to comment Share on other sites More sharing options...
Steve Posted April 13, 2008 Share Posted April 13, 2008 Wish i knew more about these Dave Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted April 13, 2008 Author Share Posted April 13, 2008 So do I Steve so do I he he he Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted April 17, 2008 Author Share Posted April 17, 2008 All sorted... Link to comment Share on other sites More sharing options...
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