Problem with flat spots with higher boost

[GunMetalR33]

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...

[meggala]

its probably because the car is running way to rich

[GunMetalR33]

Thanks,

Do you know of any way to lean it of without change to computer?

[MM2death]

SAFC

[GunMetalR33]

Sorry I am new to forums & Skylines, what does SAFC mean?

[predator]

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.

[GunMetalR33]

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

[DJ_L3ThAL]

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

[DJ_L3ThAL]

btw i do have a zorst, safc pod etc

[Steve]

I think the factory boost cut is 12psi.

[GTS-t VSPEC]

Apparently the boost cut is different between auto and manuals, can anyone confirm this?

See'ya:burnout:

[Sydneykid]

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

[Jay95R33]

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

[GunMetalR33]

thanks guys, this has been very helpfull!!!

[gts-4 dreamer]

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....

[32line]

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=

[CEF11E]

look at the date of this thread....

jeebus

[bubba]

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

[GunMetalR33]

  GunMetalR33 said:

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