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Microtech hard jerk/hesitation tuning issue

Old 07-23-09, 04:48 PM
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hard jerk/hesitation tuning issue

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.
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Old 07-23-09, 05:50 PM
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what injectors do you have?
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Old 07-23-09, 10:16 PM
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What ECU do you have.

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Old 07-25-09, 02:42 PM
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bosch 850cc primaries, and 1600cc secondaries. It's a microtech LT-10S i believe (does both fuel and ignition)
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Old 07-26-09, 10:04 AM
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Does the jerk occur when you are in decel fuel cut and then get back on the throttle?
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Old 07-31-09, 10:29 PM
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Not tuned very well.
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Old 08-02-09, 12:24 AM
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Try to Recab your TPS.
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Old 08-02-09, 03:58 AM
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Its not your TPS.
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Old 08-02-09, 08:14 PM
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Originally Posted by rx72c View Post
Its not your TPS.
How so? i had this problem before and after recabing the TPS it worked.
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Old 08-04-09, 01:50 AM
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to rich at 0 hg and 2 psi ?
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Old 08-04-09, 03:53 AM
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You had a different problem.

he has a staging problem. very common.
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Old 09-04-09, 07:51 PM
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so how do i fix it?
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Old 09-05-09, 11:00 AM
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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.
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Old 09-05-09, 04:55 PM
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Originally Posted by Aaron Cake View Post
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.


i had 50 % and stage at 1750 and 0 hg and it seemed to help a bit
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Old 09-05-09, 05:53 PM
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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.
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Old 12-16-09, 07:49 PM
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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?
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Old 12-17-09, 04:03 PM
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No you have to retune your whole map before the secondaries come on.
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