GunMetalR33 Posted April 30, 2003 Share Posted April 30, 2003 I have a 1994 R33, I just turn my boost up to 11 pound using a single stage turbo smart boost controller. Since then I am having a problem with flat spots between 4,000 and 5,000 rpm. A mate of mine said that the R33's have factory boost limiters maped into the computers? An suggestions would be helpfull. Thanks... Link to comment https://www.sau.com.au/forums/topic/15019-problem-with-flat-spots-with-higher-boost/ Share on other sites More sharing options...
meggala Posted April 30, 2003 Share Posted April 30, 2003 its probably because the car is running way to rich Link to comment https://www.sau.com.au/forums/topic/15019-problem-with-flat-spots-with-higher-boost/#findComment-304774 Share on other sites More sharing options...
GunMetalR33 Posted April 30, 2003 Author Share Posted April 30, 2003 Thanks, Do you know of any way to lean it of without change to computer? Link to comment https://www.sau.com.au/forums/topic/15019-problem-with-flat-spots-with-higher-boost/#findComment-304776 Share on other sites More sharing options...
MM2death Posted April 30, 2003 Share Posted April 30, 2003 SAFC Link to comment https://www.sau.com.au/forums/topic/15019-problem-with-flat-spots-with-higher-boost/#findComment-304794 Share on other sites More sharing options...
GunMetalR33 Posted April 30, 2003 Author Share Posted April 30, 2003 Sorry I am new to forums & Skylines, what does SAFC mean? Link to comment https://www.sau.com.au/forums/topic/15019-problem-with-flat-spots-with-higher-boost/#findComment-304808 Share on other sites More sharing options...
predator Posted May 1, 2003 Share Posted May 1, 2003 Super AirFlow converter.. by Apexi.. it hooks into the oxygen and air flow meter sensors of the car and into the ECU .. basically a correction factor so the ECU "sees" less or more air than actually going in for each rev range. With a different reading "seen", the ECU adjusts the fuel mapping accordingly resulting in a richer or leaner mixture than factory. This generally can be used to give the car a 20-30% power increase with the right tuning. Its what you use when you don't have a full aftermarket computer (around $1000 more) where the fuel maps (and other things) can be adjusted internally a lot more accurately. Hope that helps. Link to comment https://www.sau.com.au/forums/topic/15019-problem-with-flat-spots-with-higher-boost/#findComment-304961 Share on other sites More sharing options...
GunMetalR33 Posted May 1, 2003 Author Share Posted May 1, 2003 Thanks for your reply, I was going to buy an after market computer. By reading your post above it looks like that will solve my problem. Ps, Is it true that the standard R33 computer has a over boost restricter? because the problem only exists at 10 pound and over Link to comment https://www.sau.com.au/forums/topic/15019-problem-with-flat-spots-with-higher-boost/#findComment-305099 Share on other sites More sharing options...
DJ_L3ThAL Posted May 1, 2003 Share Posted May 1, 2003 i have a similar problem b ut my car is tuned properly, im looking at my coils as being the problem, they are very expensive to replace Link to comment https://www.sau.com.au/forums/topic/15019-problem-with-flat-spots-with-higher-boost/#findComment-305630 Share on other sites More sharing options...
DJ_L3ThAL Posted May 1, 2003 Share Posted May 1, 2003 btw i do have a zorst, safc pod etc Link to comment https://www.sau.com.au/forums/topic/15019-problem-with-flat-spots-with-higher-boost/#findComment-305632 Share on other sites More sharing options...
Steve Posted May 1, 2003 Share Posted May 1, 2003 I think the factory boost cut is 12psi. Link to comment https://www.sau.com.au/forums/topic/15019-problem-with-flat-spots-with-higher-boost/#findComment-305666 Share on other sites More sharing options...
GTS-t VSPEC Posted May 1, 2003 Share Posted May 1, 2003 Apparently the boost cut is different between auto and manuals, can anyone confirm this? See'ya:burnout: Link to comment https://www.sau.com.au/forums/topic/15019-problem-with-flat-spots-with-higher-boost/#findComment-305832 Share on other sites More sharing options...
Sydneykid Posted May 1, 2003 Share Posted May 1, 2003 Hi GunMetalR33, the issues and solutions are; 1. Over boost protection, the ECU cuts fuel and ignition when boost goes over 11 psi. Solution device called boost cut defeater. Cost a couple hundy. 2. 180 kph speed limiter, the ECU cuts fuel and ignition when the speed goes over 18o kph. Solution device called speed limit defeater. Cost a couple hundy. 3. Fuel mixture enrichment, the ECU increases the fuel supply as boost increases. Solution device called SAFC as explained above. Cost a few hundy. 4. Ignition timing retard, the ECU retards the ignition timing as boost increases. Solution device called ITC similar to SAFC except it modifies the timing signal such that the ECU does not retard the ignition. Cost a few hundy. So if you add all these together you will find that the total cost ends up more than a Power FC. Particularly if you can pick up a used one. If you want to fix all of these issues we always recommend the PFC, if you are happy missing out on more than one fix then maybe the SAFC is worthwhile. Hope that helps Link to comment https://www.sau.com.au/forums/topic/15019-problem-with-flat-spots-with-higher-boost/#findComment-306138 Share on other sites More sharing options...
Jay95R33 Posted May 1, 2003 Share Posted May 1, 2003 Andrew (Jayson here ), I was just thinking, it could be the gap in your plugs !!! Damn, if I would've thought about that last night we could re-gapped them then Seems your car is one of the rare ones that are totally stock, I'd say your plugs are still gapped at 1 or 1.1mm !! Damn (hitting myself in the head), I should've thought about that !! Cool, we can re-gap your plug's a little on the weekend and see how it goes? J Link to comment https://www.sau.com.au/forums/topic/15019-problem-with-flat-spots-with-higher-boost/#findComment-306358 Share on other sites More sharing options...
GunMetalR33 Posted May 2, 2003 Author Share Posted May 2, 2003 thanks guys, this has been very helpfull!!! Link to comment https://www.sau.com.au/forums/topic/15019-problem-with-flat-spots-with-higher-boost/#findComment-306938 Share on other sites More sharing options...
gts-4 dreamer Posted December 4, 2006 Share Posted December 4, 2006 my car was stock.. but shite, after putting on exhuast and fmic... YOU CNT GO BACK !!!, soooOOOo much more efficient, seriously that smic is sooOOO shithouse its not funny.... Link to comment https://www.sau.com.au/forums/topic/15019-problem-with-flat-spots-with-higher-boost/#findComment-2724761 Share on other sites More sharing options...
32line Posted December 4, 2006 Share Posted December 4, 2006 my mate was having the same problem with flat spotting in his 32gts-t. chek out his thread, cause he fixed it...includes pics of the problem...(which turned out to be a stupidly tiny problem) http://www.skylinesaustralia.com/forums/in...=139666&hl= Link to comment https://www.sau.com.au/forums/topic/15019-problem-with-flat-spots-with-higher-boost/#findComment-2724887 Share on other sites More sharing options...
CEF11E Posted December 4, 2006 Share Posted December 4, 2006 look at the date of this thread.... jeebus Link to comment https://www.sau.com.au/forums/topic/15019-problem-with-flat-spots-with-higher-boost/#findComment-2725251 Share on other sites More sharing options...
bubba Posted December 4, 2006 Share Posted December 4, 2006 (edited) Seeing as we're resurrecting old threads.. Does does the r32 ecu have a boost cut? and if so, how does it measure the pressure and where from? Edited December 4, 2006 by bubba Link to comment https://www.sau.com.au/forums/topic/15019-problem-with-flat-spots-with-higher-boost/#findComment-2725633 Share on other sites More sharing options...
GunMetalR33 Posted December 5, 2006 Author Share Posted December 5, 2006 Sorry I am new to forums & Skylines, what does SAFC mean? ha ha ha, I cant believe I asked this type of question Its amazing how much you can learn from this forum... I went from "What does SAFC mean" to installing after market ecu, turbo, injectors and clutch etc man, this takes me back to the first couple of weeks that I had the car Link to comment https://www.sau.com.au/forums/topic/15019-problem-with-flat-spots-with-higher-boost/#findComment-2727317 Share on other sites More sharing options...
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