Jetlag

My car doesn't want to pull beyond 4500rpm in any gear. When I put her at WOT, she hesitates @ 4500rpm, pulling but not hard. It will continue to pull but at a very so rate.
It seems like something is holding it back. This problem occurred after I installed the upgraded 1300cc injectors. I have reset my PFC to 1300cc and did the injector lag time adjustments. Lag time that I used was Jason's recommendation.

My modification includes: 550/1300cc, PFC, D/P, FMIC, cat-back, intake and a Type R badge. I am still running an air pump, main cat and seq-turbo.

Thanks, Jay

twokrx7

iTrader: (1)

What is your boost runing under these conditions? Has it changed? ? ?

Jetlag

The boost goes up as load/rpm is applied, but doesn't want to maintain boost level set. The car bucks and pops as the rpm climbs. I even try going non-seq to see if it's any of the turbo control actuator. The condition is still the same.
The spark plug look a little rich, other than that, it's fine.

Roadracing7

iTrader: (2)

I think the problem is your car doesn't like the Type R Badge!

Check the boost sensor, replace the plugs, check for fuel leaks under the manifold (sniff test should suffice), how long since a fuel filter?

Jetlag

Hey, no fuel leakage anywhere, the filter are 10k old and the plugs are not even 1k on it.

Tim Benton

iTrader: (1)

do you have the datalogit?

Tim

SPOautos

It sounds kinda like your main cat is cloged

STEPHEN

Qball

its probably not fuel injector related.. i just popped my 850's out.. slapped in the 1300's and didnt even touch the lag and it pulls all the way to redline

Roadracing7

iTrader: (2)

Qball, hope you have gotten a chance to check your air/fuel ratios... That's the point of the lag adjustment...

Richard

Jetlag

No Datalogit yet....Maybe in a few months.

If it's a clog cat, then why does it occurs at the same rpm every time?

Oatmeal Junkie

Sounds like you have way too much fuel going in there.

DavidDeco

strange but I have something slightly similar, a stumble around 4200 rpm at low boost and use 1300s too. I have not been able to tune out of it and I have tried increasing fuel and decreasing fuel in those cells to little avail...my car got sandwiched and is back at the body shop but this was something I though might be PowerFC or 1300cc related too.

Mr rx-7 tt

iTrader: (5)

Sounds like your keeping/holding the changes...If you look at your settings on the commander is it showing 1300 cc in the secondaries?

maxcooper

I had a secondary sieze after getting it cleaned and letting it sit for a few months before I used it. It was a stock 850 with no size adjustments done. The car would fall on its face as soon as I hit boost or about 4000 RPM.

It might be worth checking the secondary injector connections, or apply power directly to the injector to make sure that it clicks.

-Max

mjw

iTrader: (1)

I have a similar problem, I know my 1300's are firing just fine because the car still pulls. I only get the hesitation when I am on partial throttle/light boost though, as soon as that needle swings past 4000 I can feel a slight hesitation sometimes. It is not like the sequential 3000 hesitation, more subtle than that. I haven't done anything to try and tune it out yet, not sure what is causing this though. I recently sent out my primaries (550cc stock) to be cleaned at RC and only noticed the problem after I reinstalled them and drove the car, but I didn't touch the 1300's at all since they were recently cleaned!

twokrx7

iTrader: (1)

Try increasing the injector overlap settings using a datalogit, it worked well on my car with stock primaries and 1300's. No stumble.

I was also able to minimize tip-in stumble by adjusting the accel settings, play with the both the amount and decay settings for best results.

Benjamin

You had NO need to buy those injectors. If you've still got the stock cat, then it's not possible to neet that much fuel, for there's no extra air flow to compensate for. You could have bought a MP & something else necessary instead. Whoever conned you into buying their injectors was cheating you.

Oh--enough ranting. Is it popping and running excessively rich? If so, pull the injectors again and check the o-rings (they need to be oiled as you put the injectors in). I had that issue last month.

-BN