Phil Wall Posted July 4, 2001 Share Posted July 4, 2001 I am running a Jap TT with HKS induction, Hiper and one cat replacement pipe (second cat). I usually run SUL with one bottle of Millers per tank. What sort of boost levels should I expect? Quote Link to comment Share on other sites More sharing options...
Phil Posted July 4, 2001 Share Posted July 4, 2001 I would say you should be getting around 12-14psi or so. I take it you haven't hit fuel cut? This is at about 15psi. Quote Link to comment Share on other sites More sharing options...
Phil Wall Posted July 4, 2001 Author Share Posted July 4, 2001 If thats the brick wall I hit the other day, then may be I have hit 15 psi Thanks Quote Link to comment Share on other sites More sharing options...
Phil Posted July 4, 2001 Share Posted July 4, 2001 Yeah, that'll be the one! In that case you are getting to 15psi and you need a Pete Betts FCD pronto. Quote Link to comment Share on other sites More sharing options...
Guest Ash Posted July 4, 2001 Share Posted July 4, 2001 Yes, it is not a good thing to keep hitting fuel cut repeatedly. I can say that Pete's FCD works very well on the MKIV as I've had the chance to test one thoroughly. Yours, J Quote Link to comment Share on other sites More sharing options...
Phil Wall Posted July 4, 2001 Author Share Posted July 4, 2001 Oh dear, Only hit it once. I guess I better slow down a bit then:sad: Quote Link to comment Share on other sites More sharing options...
Guest Ash Posted July 4, 2001 Share Posted July 4, 2001 No, that's okay. It's when you start hitting it *repeatedly*. Like, 6 times a day or something. Yours, J Quote Link to comment Share on other sites More sharing options...
francesca Posted July 4, 2001 Share Posted July 4, 2001 I'm really confused, does fuel cut always come in at 15psi? Mine will boost to 18+ (I know, I know it's bad & I try VERY hard not to) but I have never come across fuel cut. Does this mean I must have a FCD fitted? If so where - would I know? I am getting a tad worried about turbos, running lean etc - hardly dare put my foot down at the moment! What's that about a little knowledge being a dangerous thing..! Quote Link to comment Share on other sites More sharing options...
Guest Ash Posted July 4, 2001 Share Posted July 4, 2001 All MKIV's have a fuel-cut that comes in about 14 to 15 psi. Unless it has been "defeated" in some way. Yours, J Quote Link to comment Share on other sites More sharing options...
Phil Wall Posted July 4, 2001 Author Share Posted July 4, 2001 Francesca I would get someone to check out what FCD you have. You don't want one that runs your engine lean! (Edited by Phil Wall at 9:13 pm on July 4, 2001) Quote Link to comment Share on other sites More sharing options...
francesca Posted July 4, 2001 Share Posted July 4, 2001 I know, that's what I'm concerned about. Assuming the boost gauge is reading correctly it has definitely shown up to 1.3 (about 18.8psi?) & that wasn't absolutely flat out. I don't dare push it any further. I also have a leaky old type Blitz dump valve at the moment which starts to lift the piston at around 4000rpm, which I assume would restrict boost pressure to some extent - is that correct? (the theory I mean!) I had the car serviced at Option Motorsport, they didn't mention FCD, I assume they would be able to tell me if there was one? Quote Link to comment Share on other sites More sharing options...
Guest Ash Posted July 5, 2001 Share Posted July 5, 2001 Francesca.................. The only FCD I can recommend for the MKIV is Pete Betts' unit. Now and again, you come across some add-on gizmo that actually works well. Pete's unit is one of these. Pete's unit first allows the pressure signal to connect to the ECU unaltered. Which keeps the sequential turbo transition and the air/fuel ratios *exactly* as Toyota intended. Then, just as fuel-cut is about to be initiated, the unit clamps the pressure signal voltage. Once the voltage is clamped, however, it *will* affect the fuelling. The "saviour in disguise" is the fact that come 15psi boost, the stock turbo setup is operating very inefficiently. Which does not appear to be the case on the EVO which goes lean *very* rapidly. One thing I'd like to do (if I ever get time) is to data-log the MKIV and EVO A/R signal with a "before and after" comparison. Then, rather than me keep explaining it, I could simply point people to a website address where you could see a graphical representation of exactly what I mean in the way the A/R ratio is leaned out. Yours, J Quote Link to comment Share on other sites More sharing options...
Phil Wall Posted July 6, 2001 Author Share Posted July 6, 2001 Thanks Ash Pete's unit is now on order. Quote Link to comment Share on other sites More sharing options...
Guest Ash Posted July 6, 2001 Share Posted July 6, 2001 Yep, wise move. Yours, J Quote Link to comment Share on other sites More sharing options...
Phil Wall Posted July 6, 2001 Author Share Posted July 6, 2001 I was imporessed to read that Petes unit has an 18 psi safety limit. Quote Link to comment Share on other sites More sharing options...
matt Posted July 6, 2001 Share Posted July 6, 2001 Guys........ R U saying the HKS fcd is cr*p, and should be replaced with one of Mr Betts???? If so ......... how cr*p r they....... and have any listers had probs with the HKS version?? I ask 'cos I've just fitted a HKS .. ...... and I wouldn't like to think a superior solution was available .....and only 60quid!!!! Quote Link to comment Share on other sites More sharing options...
Branners Posted July 9, 2001 Share Posted July 9, 2001 thats a difficult question to answer, the HKS one does the job and is used extensively by the guys in the states, but Pete Betts one works in a better way as it was specifically designed for the Supra. It also has the boost cut raised to 18psi so it still retains some safety margin where I think the HKS one just totally removes it. I would talk it through with Pete Betts and find out his views, I wouldnt want to recommend removing the HKS unit unless somebody can really prove that the HKS one is inferior to Pete Betts one. JB Quote Link to comment Share on other sites More sharing options...
Phil Wall Posted July 9, 2001 Author Share Posted July 9, 2001 I dont think the HKS is cr*p. However I spent along time reading about both units and decided to go for Pete's as it still offered 18psi protection. I could not find anything to say that the HKS unit offered this level of protection. Also I understod that Pete designed this unit just for the Supra. Quote Link to comment Share on other sites More sharing options...
matt Posted July 9, 2001 Share Posted July 9, 2001 Hey Guys I am interested in the 18psi protection of the Betts model as I seem to be gettin false (ie too low) readings from the gauge....... I have never seen more than 0.9bar on the gauge with a cat replacement pipe and FMIC as the only mods, yet I hit fuel cut on stock exhaust (with cats) and only the FMIC fitted. Now I only fitted the FMIC to replace the stock IC which unexplainedly popped off an endcap shortly after I got it....(this was on a completely stock import) I have replaced the gauge with a Blitz mechanical one , and it is plumbed as per the mkiv.com info . I have checked the integrity of all pipes etc and looked for evidence of previous bleed valves etc ....... the pipe work is all original (bar the hoses in the FMIC kit) Any Ideas????............... could it be Turbo hoses expanding...... do I need hard pipes?? Any help would be appreciated.......... TIA Quote Link to comment Share on other sites More sharing options...
Phil Posted July 9, 2001 Share Posted July 9, 2001 Are you sure you were hitting fuel cut? This sounds unlikely with standard exhaust and cats in. Fuel cut is very scary and almost feels like you've hit a brick wall, I thought I'd blown my turbos the first time it happened to me. Quote Link to comment Share on other sites More sharing options...
matt Posted July 9, 2001 Share Posted July 9, 2001 Hey Phil......Yeah........... I'm pretty sure it was fuel cut ..... it went away after fittin the fcd......... I know it sounds odd.......... I'll get it into someone to check the boost level on a known gauge (I can't trust this one without checkin, even tho' this is the 2nd) I had put down the blowin of the stock IC as bad luck and a Friday afternoon job........especially as every1 I spoke 2 had never come across this b4..... .......But now I'm wondering if it was overboosting then. Quote Link to comment Share on other sites More sharing options...
Phil Wall Posted July 9, 2001 Author Share Posted July 9, 2001 I have only hit fuel cut once. Thought I had blown the engine it was voilent. It really is like hitting something very hard. Quote Link to comment Share on other sites More sharing options...
matt Posted July 9, 2001 Share Posted July 9, 2001 u gotta b from the black country with that accent :wink: ........ but I'm sure I hit fuel cut.......sudden loss of go, wait for boost to drop and off it goes ?? Brick wall is a bit far......I hit it passin an impreza and it allowed him 2 gain somewhat........... Quote Link to comment Share on other sites More sharing options...
Phil Posted July 9, 2001 Share Posted July 9, 2001 No, you get a really violent bang and the red triangle comes on in the centre of the dash, you would certainly drop the throttle out of fright. I can't see that you would get from 11psi to 15psi just by fitting an FMIC, this should just lower the intake temperature and make the turbo more efficient. If it was in 1st or 2nd it may have been you TC? Quote Link to comment Share on other sites More sharing options...
matt Posted July 9, 2001 Share Posted July 9, 2001 Maybe it wasn't fuel cut then............. I didn't get the warning light on the dash, although it was a severe sensation....... (I have in the past hit a brick wall and this was rather less disturbing :wink:) ....but it has gone away with the fcd fitted Any thoughts????? Quote Link to comment Share on other sites More sharing options...
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