Stu_Fraser Posted October 21, 2004 Share Posted October 21, 2004 Hi Everyone, Its my first post on this forum! I had a decat fitted last week (first cat only), which is connected up to a Blitz Nur spec exhaust. Some times when i floor the car the accelaration seems to be very flat in 2nd gear( thats the only way i can seem to describe it) above 4000rpm , but when i hit the rev limit and the car changes gear (its an auto) it seems to take off. This doest happen all the time The boost guage is showing 15psi in both instances, anyone any ideas as to why this is? Quote Link to comment Share on other sites More sharing options...
GeordieSteve Posted October 21, 2004 Share Posted October 21, 2004 Sounds like you need a FCD to me Quote Link to comment Share on other sites More sharing options...
Steve W2 Posted October 21, 2004 Share Posted October 21, 2004 Originally posted by GeordieSteve Sounds like you need a FCD to me Look at his sig he already has one. Welcome to the forum by the way. Do you have a boost controller fitted, have you changed your spark plugs since decatting? Also maybe a silly question but have you tried adjusting the FCD to ensure it set higher than 1 Bar? (14.7psi) If not you could still be getting fuel cut. Quote Link to comment Share on other sites More sharing options...
GeordieSteve Posted October 21, 2004 Share Posted October 21, 2004 Doh! He's just added that... go on ADMIT IT!!!! Quote Link to comment Share on other sites More sharing options...
SkyJawa Posted October 21, 2004 Share Posted October 21, 2004 Yeah - could well be the plugs, mine was the same, used to miss when ragging it. Changed for some Denso 24's and all was well Quote Link to comment Share on other sites More sharing options...
tbourner Posted October 21, 2004 Share Posted October 21, 2004 I just fitted NGK BCPR7ES and it seems to have gotten worse!!! Spits and farts on idle now more than it did before! Quote Link to comment Share on other sites More sharing options...
merckx Posted October 21, 2004 Share Posted October 21, 2004 From Stu's description of the problem it doesn't appear to be fuel cut, but as SkyJawa say's it could be a misfire caused by the plugs. The Denso IK 24's are supposed to be good. I was getting a misfire after doing my decat and I bought some NGK BKR7E plugs - these are also recommended highly but are much cheaper than the Denso plugs. My car now runs perfectly. You can get some at Brown Brothers, 19 Brough Park Way in Newcastle, NE62YT. They're only £10.43 for a set of 6 compared to about £70 for the Denso plugs . Quote Link to comment Share on other sites More sharing options...
Irvy Posted October 21, 2004 Share Posted October 21, 2004 Originally posted by Stu_Fraser Hi Everyone, Its my first post on this forum! I had a decat fitted last week (first cat only), which is connected up to a Blitz Nur spec exhaust. Some times when i floor the car the accelaration seems to be very flat in 2nd gear( thats the only way i can seem to describe it) above 4000rpm , but when i hit the rev limit and the car changes gear (its an auto) it seems to take off. This doest happen all the time The boost guage is showing 15psi in both instances, anyone any ideas as to why this is? Hi Stu Am in the process of completing a few mods similar to yours and found my car was not going so well or going along like it was trying to blow out a candle...for all you older ones-place finger to lips and.. - Monkey calling for his cloud!! ...i have upgraded the plugs which appear to have worked....99% of the time! Am having an uprated fuel pump fitted tomorrow...will let you know if this sorts me out Irvine Quote Link to comment Share on other sites More sharing options...
Ian C Posted October 21, 2004 Share Posted October 21, 2004 Sounds to me like the 2nd turbo isn't cutting in "flat" acceleration would be classed as eff all power to me, jerky/chuggy would be a misfire and "brick wall" is fuel cut. Have a read of http://www.mkivsupra.net/vbb/showthread.php?s=&threadid=27904 -Ian Quote Link to comment Share on other sites More sharing options...
Stu_Fraser Posted October 22, 2004 Author Share Posted October 22, 2004 Thanks for you quick response people Its definitely not fuel cut, I used to have a celica GT4 and used to hit fuel cut in that and it was like hitting a brick wall It doesnt feel like a misfire either as its still smooth with eff all accelaration. The weird thing is when this happens im still getting a steady 15psi of boost and when the car changes up from second to third all seems fine:twak: Not got a boost controller yet, the boost is kept under control by the second cat........ Have not changed the plugs since the decat so this will probably be my next step Also already give the vacuum hoses the once over but will have a better look tomorrow as i may have missed a couple, still not used to having two turbo's :D Quote Link to comment Share on other sites More sharing options...
Irvy Posted October 22, 2004 Share Posted October 22, 2004 update! had my pump fitted today...and i had no problems going through the 120 barrier...seems my car is sorted hope this helps irvine Quote Link to comment Share on other sites More sharing options...
eyefi Posted October 22, 2004 Share Posted October 22, 2004 sounds like it could b the auto box if its always in 2nd. do the revs rise out of sync with yr forward motion? Quote Link to comment Share on other sites More sharing options...
Stu_Fraser Posted October 25, 2004 Author Share Posted October 25, 2004 The problem could just be a quirk of the auto box........... Bloody typical, done a fair few miles this weekend and the car was running fantastic, seemed to pulling really hard in all gears :D Quote Link to comment Share on other sites More sharing options...
Stevie Boy Posted October 25, 2004 Share Posted October 25, 2004 You've got exactly the same symptoms as another Stu Fraser from another Forum..... Are you still experiencing these probs then? I thought we ruled out any turbo probs cos you made the 15psi boost... I still reckon it quirks of the Auto box mate, hopefully there isn't actually summik wrong with it i.e not kicking down when it should although this could be down to the Auto Box Transmission Control Module. Did Martin F elaborate on the consequenses of the Speedo recalibrated signal affecting the Auto Transmission? Quote Link to comment Share on other sites More sharing options...
Guest Silverfox Posted October 25, 2004 Share Posted October 25, 2004 :innocent:help!new member in trouble,2000 ZRS facelift auto/tiptronic fine during normal use,but when she gets hot after an hour or so hard driving,using full kickdown she seems to splutter and hesitate before picking up,a bit embarassing when doing the big overtaking manouvre,ive just picked up on another site about petrol used, im using ordinary unleaded,also no vent in the bonnet so lots of heat generated,ive got a dump valve thingy which was already fitted,dont really know what it does,but its got three little buttons on it which alter the settings,everything else is original,only done 12000 miles by the way,any thoughts guys? Dave Quote Link to comment Share on other sites More sharing options...
Jake Posted October 25, 2004 Share Posted October 25, 2004 Dave/Silverfox, You might want to start a new thread of your own. It gets a bit messy when two folks are trying to get their question answered in the same thread. Quote Link to comment Share on other sites More sharing options...
Dave Posted October 25, 2004 Share Posted October 25, 2004 would the same apply to an n/a with a decat i have just had mine done and havent noticed much differance also got an apexi induction kit fitted should i fit these ngk plugs Quote Link to comment Share on other sites More sharing options...
geoffvalenti Posted October 26, 2004 Share Posted October 26, 2004 Originally posted by Silverfox 2000 ZRS facelift auto/tiptronic im using ordinary unleaded, ive got a dump valve thingy which was already fitted,dont really know what it does,but its got three little buttons on it which alter the settings Hi Dave First thing to do is change to Shell Optimax or BP Ultimate petrol. At a push "normal" super unleaded is probably OK, standard unleaded is a definite no, no. You don't say which dump valve you've got fitted, but if it vents to atmosphere, ie. you can hear the pssssst noise, then you need to see if it'll work in recirculating mode (some do) If not you really need to change it, and any relevant piping, back to the standard setup. Cars like the VVTi with MAF sensors to control the fuelling, don't take kindly to having metered air dumped out of the system. It can cause it to run very rich and then very lean, which is dangerous to the health of your engine (Ask CW for an in depth technical explanation ) Previous model J-spec Supras had a MAP sensor, so could run a vent to atmosphere dump valve with no ill effects (apart from the noise ) Quote Link to comment Share on other sites More sharing options...
Stu_Fraser Posted October 26, 2004 Author Share Posted October 26, 2004 Stevie Boy, isnt that funny how there is another Stu Fraser out there with the same problem, lol Yeah, Martin did tell me about the speed converter thingy, could not find out which type i had fitted but the car has been running sweetly all weekend, even put an M3 in his place :p Quote Link to comment Share on other sites More sharing options...
Guest Silverfox Posted October 26, 2004 Share Posted October 26, 2004 :innocent:Hi Geoff thanks for the quick response,had a feeling it might be petrol,soon as the tank is ready will change to optimax,as for the dumpvalve its HKS calibrated from -1 to 2.5 opa the three buttons read from top, select, set, and war?could be wrong about war the writings very small,it makes a noise like a faint police siren! as you accelerate,maybe its something other than a dump valve,but its connected to the turbos by tubing,im new at this high tec stuff had a GT4 carlos sienze from new but fell in love with supe the rest is history,really appreciate the site its good to have so many like minded people out there. regards Dave Quote Link to comment Share on other sites More sharing options...
Stevie Boy Posted October 26, 2004 Share Posted October 26, 2004 Glad to hear your probs seems to have cleared up. Intermittant faults can be quite annoying with cars, they always seem to pop-up when don't expect them too but at least not while your putting M3's in their place!! I tell you what, i took great pleasure in totally wasting an E46 M3 During summer this year, i give give him full credit for effort he wouldn't give up!!! But unfortunately for him neither did i and before long he was lost behind me somewhere in the distance of the M25, the high speed pursuit must have gone on for a good 20miles or so and couldn't wait for my junction cos it was costing me a fortune in Optimax and if i did'nt take my exit in Pole Postion it would all have been for nothing!!! I said i'd drove sensibly when i got the Supe TT, who was i trying to kid!! That huge rear spoiler attracts far too much attention from High Performance cars who think their cars the nuts, don't underestimate the Supe i say, That HUGE spoiler's there for a reason!!!! Quote Link to comment Share on other sites More sharing options...
Stu_Fraser Posted October 27, 2004 Author Share Posted October 27, 2004 Not sure what kind of M3 it was as i could only see it in my rear view mirror It was on a 04 plate though I said the exact same thing as you when i got my supra, that i would drive it sensibly. The thing is these cars just dont wanna go slowly Also said that i wouldnt mod it, like that was gonna happen:p Quote Link to comment Share on other sites More sharing options...
Steve W2 Posted October 27, 2004 Share Posted October 27, 2004 Originally posted by Stu_Fraser Not sure what kind of M3 it was as i could only see it in my rear view mirror It was on a 04 plate though I said the exact same thing as you when i got my supra, that i would drive it sensibly. The thing is these cars just dont wanna go slowly Also said that i wouldnt mod it, like that was gonna happen:p An 04 plate will be the E46. I raced one and was neck and neck up to about 140mph when I backed off (roundabout and J-Spec discs:eek: ) My car is standard, decatted you should accelerate away nicely:) Quote Link to comment Share on other sites More sharing options...
Stu_Fraser Posted October 27, 2004 Author Share Posted October 27, 2004 Not really up on my German cars........ but its nice wiping the smiles of people who own BMW's, they think they own the road they do Quote Link to comment Share on other sites More sharing options...
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