Injectors being cut

s300 and SManager software questions & answers
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darren
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Injectors being cut

Post by darren » Sun Jun 10, 2018 1:15 pm

So if I'm driving along at say 30mph, 1% to 2% throttle, my injectors keep being cut causing a jerk.
Engine is a b16 on ITB's

Any ideas?

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Spunkster
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Re: Injectors being cut

Post by Spunkster » Mon Jun 11, 2018 9:31 am

Has this been properly tuned on the dyno?

darren
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Re: Injectors being cut

Post by darren » Mon Jun 11, 2018 11:42 am

It has been tuned on a dyno by myself, its my first tune so I'm still learning but runs great apart from 1-2% throttle opening. I shall upload the datalog

darren
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Re: Injectors being cut

Post by darren » Mon Jun 11, 2018 11:46 am

You can see the problem in the first 15 seconds
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Injector cut.s3d
(841.92 KiB) Downloaded 23 times

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Spunkster
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Re: Injectors being cut

Post by Spunkster » Mon Jun 11, 2018 5:18 pm

Post the calibration as well

darren
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Re: Injectors being cut

Post by darren » Mon Jun 11, 2018 11:53 pm

Calibration is now attached
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B16a-ITB.skl
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Re: Injectors being cut

Post by Spunkster » Tue Jun 12, 2018 5:03 pm

Do you have the MAP sensor connected and reading vacuum?

darren
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Re: Injectors being cut

Post by darren » Wed Jun 13, 2018 5:01 am

Yes, vacuum taken from all 4 runner's to a vac box, then map sensor reading vac from there

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Re: Injectors being cut

Post by Spunkster » Wed Jun 13, 2018 9:13 am

IT is most likely form the overrun fuel cutoff settings. Try adjusting those and see if that has the desired effect.

2x0
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Re: Injectors being cut

Post by 2x0 » Mon Jun 18, 2018 10:56 am

Go into TPS parameters, lower the TPS % for overrun fuel cutoff (TPS), and lower the numbers for MAP (kPa) in the overrun cutoff (MAP). I use 18-19 on mine up to around 4000rpm and its smooth as can be.
'91 CRX, B18c1, T3/T4, 17psi on e85, FIC 1000cc's, S300 V3 P28

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