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View Full Version : rb25det s1 maf maxed out?

gsn0526
10-25-2012, 10:06 PM
problem= rb25det s1 is dropping power at 9-10lbs at full throttle.

Reason = from what ive understood by research is maf is maxing out in voltage and ecu is cutting fuel and spark after retarding timing.

driving the car and giving full throttle there is an obvious 20-30 hp loss at higher rpms. if i stay in full throttle the car will just like hit a dead spot where the afrs go off the meter. if i roll into it its all power is there seems like the maf freaks the computer out when I full throttle quickly.

I want to find a way around not turning down boost and not buying something to tune with. From what i understand the n60 or the n62 maf could work but unsure if i will absolutely need a tune.

on the dyno i made 280 but when ecu took over with the timing shit i made 250-255. car does have adjustable fpr.

Any helpful input is much appreciated!!
gsn0526
10-27-2012, 07:58 PM
Anything? Might just need to turn it down
fliprayzin240sx
10-28-2012, 12:05 AM
Its the ECU. From what I've been told is that when the ECU senses that you're pushing more than 7 psi, it has a tendency to pull timing. Thats why it feels like doo doo.
gsn0526
10-28-2012, 10:43 AM
yea i understand that, rather aggravating. anyway around it?
fliprayzin240sx
10-28-2012, 03:13 PM
Rom tuned ECU being the cheapest or a stand alone computer like Power FC.

There's no point of pushing the stock turbo to 10 psi. It'll just break apart when you crank it pass 8 psi.
gsn0526
10-28-2012, 05:12 PM
yea i know its something thats gonna happen but i always heard they dont like more than 10 psi. im just gonna turn it back to 8 until i take it back out for build.
fliprayzin240sx
10-28-2012, 08:36 PM
Im at stock 7 psi and my shits starting to smoke intermittently. I got more shaft play than I did when I first got the car running. That was only 4 wks ago...
2.5T_/<ouki
10-28-2012, 09:08 PM
Im at stock 7 psi and my shits starting to smoke intermittently. I got more shaft play than I did when I first got the car running. That was only 4 wks ago...

Damn thats horrible! I'm at 11 psi and i don't have any shaft play. Been at this for about a year now. No smoking either.
DJDANGER24
10-28-2012, 10:20 PM
Damn thats horrible! I'm at 11 psi and i don't have any shaft play. Been at this for about a year now. No smoking either.

Im was at 13 psi for 4 years, turbo has some shaft play now but never smoked. It didn't break apart like everyone says they would. Just for the hell of it I decided to push 15psi and did it for about a year, still didn't break apart. Still pulled hard until I upgraded.

But yea, OP you need a Z32 MAF or get it tuned. Emance tuning is pretty cheap for a ROM tune if you want to go that route. But I would just get standalone, personally.