Maxing out Flow Force 640cc Injectors, but with low power? (With logs!)
4 Attachment(s)
Hey all, I'm finally tuning my car for power and seem to be prematurely maxing my injectors. I suspect it's either a tune issue (i'm new to this), or, albeit less likely, a issue with the combination of parts.
Note:
Attachment 182620 Attachment 182621 |
it calculates duty cycles based on all the injector parameters and fuel requirements you input into the tune. and the map sensor is also out of calibration. so this is most likely a tuning issue.
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If the MAP sensor is correct, then you're down to 41psi of effective base rail pressure at 19psi. You could also be maxing out the stock fuel pump.
If the MAP sensor isn't correct, you should stop tuning, because everything you're doing will be down the drain when you finally fix the MAP sensor. |
Originally Posted by 18psi
(Post 1377290)
it calculates duty cycles based on all the injector parameters and fuel requirements you input into the tune. and the map sensor is also out of calibration. so this is most likely a tuning issue.
Originally Posted by Savington
(Post 1377293)
If the MAP sensor is correct, then you're down to 41psi of effective base rail pressure at 19psi. You could also be maxing out the stock fuel pump.
If the MAP sensor isn't correct, you should stop tuning, because everything you're doing will be down the drain when you finally fix the MAP sensor. Incredibly quick, concise, and informative feedback! I really really appreciate it (and all your historical posts for that matter). Tonight/tomorrow I'll thoroughly investigate my MAP sensor calibrations and fuel pump if necessary and will report back with my conclusion/results. Thanks again! |
NP, your minimum vacuum is -9.4
clearly it's not calibrated right or faulty (or the engine is seriously hurt, which is not the case) |
Full vacuum should be ~13-15kpa (~12.5psi).
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So, I'm struggling a bit here with getting the MAP sensor to read correctly.
The log above was had its "Common MAP Sensor" set to "MPX4250" (with default values of: 0.0 Volt and 5.0 Volt at 10 and 260 respectively).
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If your MAP sensor is a MPX4250, then the standard settings in TS are correct. If they give you the wrong values, then either your connection to the MAP sensor is questionable, or the sensor is broken. Fiddling with the settings is pointless in this case.
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35kpa is reasonable for idle, but not for overrun.
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where is it tapped into the source?
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1 Attachment(s)
Originally Posted by 18psi
(Post 1377483)
where is it tapped into the source?
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That port should be fine. But you really shouldn't share the line for the gauge too, at least it's not recommended.
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Whelp, I'm still stumped. After giving this a lot of thought, here're the only possibilities I've come to:
1. The map sensor IS calibrated and reading correctly. This likely means: - The Injectors actually are maxed - The vacuum signal actually is weak on overrun - The boost gauge is reading low (This seems like an unlikely combo, but could something else be causing these there symptoms?). 2. The map sensor itself is faulty. (I'll order another just in case). 3. The Mega Squirt itself is faulty (Reverant built, so unlikely). 4. The voltage running to the map sensor is faulty. Ugh. |
I don't see anything in your log that would indicate any trouble with your MAP sensor. Forget PSI. How many kpa when idling? how many with the engine not running?
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Both are posted above
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You maxed the fuel pump. It looks the same as "maxed out injectors" unless you know what you are looking at.
Test it this way: Back fuel in your 210kpa row off by ~5% and do a single pull. If AFRs don't change, back it off by another 5%. If AFRs still haven't changed, but your DC% has dropped by a bunch, then the fuel pump is maxed out. |
Originally Posted by 18psi
(Post 1377883)
Both are posted above
Just not sure where the perceived MAP issue is... Also 250 rwhp on VD with 210kpa off a chinacharger on a poorly tuned car with uncertain VD dyno factors doesn't seem outlandish to me either. I second the fuel pump guess. |
Aha. That log shows a 109% barometric fuel correction and a baro reading of 80kpa. OP, where do you live?
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Originally Posted by Savington
(Post 1377900)
Aha. That log shows a 109% barometric fuel correction and a baro reading of 80kpa. OP, where do you live?
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I have FF640s as well and get a PW of 12.5ms and AFR of 12.3 at 175kpa, which is my max.
You get 13.1ms and 11.3 AFR at 175kpa. So that's pretty damn good agreement. Now at 210kpa I would roughly expect 210/175 * 13.1 ms = 15.7ms , just extrapolating from the lower value. Add 10-20% for reduced flow caused by lower pressure differential and we'd expect 17.3ms to 18.9ms. You're at 18.7ms and your AFR is up. Your fuel system is maxed out. Convert to return-style system and upgrade pump. |
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