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Sard 800cc Injectors - Latency Help!

bombtrack

By bombtrack,
in Engines & Forced Induction

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bombtrack Experienced

bombtrack

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Just got my car back from the tuner after some major installation work, including new turbo, afm, injectors, cams, etc. I am extremely happy with the power output and response and the tune in general.

After lots of dyno runs we haven't been able to figure out the latency required for the injectors. The guys tried everything from positive latencies through to negative latencies. We have settled on what appears to be the standard for these injectors, 1.6ms, however the injectors seem to be dumping a bunch of fuel whenever I come off the throttle, which is igniting in the exhaust.

Anyone have any probs with these injectors in the past? Anyone know of a more appropriate latency for these injectors?

I have done a bit of research on the web and all I really come up with is 1.1ms or 1.6ms and both of these were tried and still result in issues.

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paulr33 Grand Master

paulr33

Posted
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one would assume the latency is wrong

how does the correction look? is that normal and relative to their size vs old injectors?

how did you find the AFRs when tuning it - did it need tons of correction on the INJ map or was it fairly OK?

BlueRB240 Collaborator

BlueRB240

Posted
Posted
Just got my car back from the tuner after some major installation work, including new turbo, afm, injectors, cams, etc. I am extremely happy with the power output and response and the tune in general.

After lots of dyno runs we haven't been able to figure out the latency required for the injectors. The guys tried everything from positive latencies through to negative latencies. We have settled on what appears to be the standard for these injectors, 1.6ms, however the injectors seem to be dumping a bunch of fuel whenever I come off the throttle, which is igniting in the exhaust.

Anyone have any probs with these injectors in the past? Anyone know of a more appropriate latency for these injectors?

I have done a bit of research on the web and all I really come up with is 1.1ms or 1.6ms and both of these were tried and still result in issues.

http://www.sardracing.com/products/Injectors.htm If you don't have that already.

bombtrack Experienced

bombtrack

Posted
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Posted
http://www.sardracing.com/products/Injectors.htm If you don't have that already.

Got that one, but thanks! :google:

one would assume the latency is wrong

how does the correction look? is that normal and relative to their size vs old injectors?

how did you find the AFRs when tuning it - did it need tons of correction on the INJ map or was it fairly OK?

reserved while I get more info...

Cubes Grand Master

Cubes

Posted
Posted

Likely not latency but rather the bov setup and or accelerator injector time.

Mine had an issue where light throttle accelerating with traffic from first to second it would often back fire through the exhaust. Tweaked the accelerator injector time and cleaned it almost all up.

The only time it now pops etc is due to AFM reversion as I don't run a BOV. So give first a little bit of stick and slow shift in to second almost always gets a little flamage out of the exhaust.

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