extreme_rotary

i noticed after i had my car tuned that when i get into boost, and slowly let off the throttle, and get back into primary only injection (2 psi), my car does a real hard jerk/hesistation. What do i need to do to tune this out? I believe it has something to do with the injection staging. I read the sticky and still am a little confused as to why this would happen.

rx72c

iTrader: (8)

what injectors do you have?

thewird

iTrader: (8)

What ECU do you have.

thewird

extreme_rotary

bosch 850cc primaries, and 1600cc secondaries. It's a microtech LT-10S i believe (does both fuel and ignition)

Aaron Cake

iTrader: (1)

Does the jerk occur when you are in decel fuel cut and then get back on the throttle?

rx72c

iTrader: (8)

Not tuned very well.

myfc3s

iTrader: (2)

Try to Recab your TPS.

rx72c

iTrader: (8)

Its not your TPS.

myfc3s

iTrader: (2)

How so? i had this problem before and after recabing the TPS it worked.

mattmarrx3

to rich at 0 hg and 2 psi ?

rx72c

iTrader: (8)

You had a different problem.

he has a staging problem. very common.

extreme_rotary

so how do i fix it?

Aaron Cake

iTrader: (1)

Well, the short answer is to adjust your staging settings.

With 850CC primary and 1600CC secondary, try 90% for %stage.

Then stage at 3500RPM and 2" of vacuum.

mattmarrx3

i had 50 % and stage at 1750 and 0 hg and it seemed to help a bit

rx72c

iTrader: (8)

I have played alot with staging and found that the Opt_mapstg % has made 0 difference in most scenarios.

I leave them on 50% and tune out the miss.

extreme_rotary

well, my staging is tuned at 98% i believe. My car has been in the body shop for a while and i can't remember, but dave at KDR set it up for me, then he and i tuned it with the "base" settings that he normally puts into every car. If i reset my staging to 90%, i do have to re-tune the entire MAP after the secondaries come on, correct?

rx72c

iTrader: (8)

No you have to retune your whole map before the secondaries come on.