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Injector scaling issue with V7 SD

Old Dec 6, 2017, 04:13 AM
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Injector scaling issue with V7 SD

Hope someone has some insight.

Running an evo 8 ecu on a 2g dsm. That part works correctly.

We had an issue with the MAF so we decided to go to SD. After the conversion, the injector scaling numbers have to be way off to get the car to run correctly.

Stock 513 scaling seems to work the best, however these are FIC 1120 injectors. Anything above 750 and the car runs stupid lean. When the Maf was working correctly, I had a scaling of 1083 with fuel trims under 5%.

From what I have read, the scaling shouldn't be any different on SD, playing with the VE tables cant get the readings in check at the old scaling. The car won't even run on 900+ scales.

Running the 9563 rom, changing to 9417 did not fix any issues.

On stock injector scaling, the car sits around 14.5 at idle with closed loop disabled. Any throttle goes rich, and it bogs.

We have thought it was a fuel issue, verified the pump works, new AFPR shows 42.5 psi.

We did have a misc no start issue that turned out to be the cam sensor, we just changed that and the rich throttle issue got better, but we are still at stock scaling.

Not sure where to go from here. Has anyone seen scaling this far off?
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Old Dec 6, 2017, 04:19 PM
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Originally Posted by Project_Broke View Post
Hope someone has some insight.

Running an evo 8 ecu on a 2g dsm. That part works correctly.

We had an issue with the MAF so we decided to go to SD. After the conversion, the injector scaling numbers have to be way off to get the car to run correctly.

Stock 513 scaling seems to work the best, however these are FIC 1120 injectors. Anything above 750 and the car runs stupid lean. When the Maf was working correctly, I had a scaling of 1083 with fuel trims under 5%.

From what I have read, the scaling shouldn't be any different on SD, playing with the VE tables cant get the readings in check at the old scaling. The car won't even run on 900+ scales.

Running the 9563 rom, changing to 9417 did not fix any issues.

On stock injector scaling, the car sits around 14.5 at idle with closed loop disabled. Any throttle goes rich, and it bogs.

We have thought it was a fuel issue, verified the pump works, new AFPR shows 42.5 psi.

We did have a misc no start issue that turned out to be the cam sensor, we just changed that and the rich throttle issue got better, but we are still at stock scaling.

Not sure where to go from here. Has anyone seen scaling this far off?
whats your ve looking like at idle and on what cams
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Old Dec 11, 2017, 03:54 AM
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Originally Posted by Dakota Evo View Post
whats your ve looking like at idle and on what cams
Stock cams.

500- 80
1000-91
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Old Dec 13, 2017, 09:42 AM
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Are you using 3D VE ? or older SD ?

Try reading Scheides tuning thread on SD and start tuning.

All these issues will be gone.
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Old Dec 14, 2017, 04:56 AM
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Originally Posted by mines5 View Post
Are you using 3D VE ? or older SD ?

Try reading Scheides tuning thread on SD and start tuning.

All these issues will be gone.
It's the latest v7 Rom. However I don't think I have 3D SD. Just the 2 SD tables.

I have read his guide a few times. The issue lies in that I run out of adjustment to get the car near the correct scaling.

If I up the scaling to the maf setting of 1083, I have to modify the SD rpm tables to max to get it to even start. So the only thing I can do is drop the scaling for more fuel.
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Old Dec 14, 2017, 06:40 AM
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Set your injector scaling size and battery latency to what it was good known. Then adjust just the MAP VE table in the lower KPA areas to start. Get a good idle afr then tune rest.
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Old Dec 14, 2017, 09:43 AM
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Originally Posted by 4b11slayer View Post
Set your injector scaling size and battery latency to what it was good known. Then adjust just the MAP VE table in the lower KPA areas to start. Get a good idle afr then tune rest.
Exactly.

I can't do this.

Changing the scaling takes too much fuel away, and the car wont run without extreme settings.

Bring the scaling back to stock evo scaling, car runs.
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Old Dec 14, 2017, 11:04 AM
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When you set the injector settings to good known. What is your MAP VE?
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