I have a 6gen Camaro Ss with a blower, lt4 pump/injectors and a built bottom end in the shop. Car was previously built and tuned elsewhere. I noticed the high side pressure is barely hitting 1000 and takes a while to get there. I looked over the tune and didn't see anything holding it back. Just looking to see if you guys see something I might have missed.....or am I ordering a new high side for this guy.
2018ECSBLUE1LE.004.hpl2018ECS.SUPERCHARGED.1LECAMARO.004.hpt
Stock cam?
I looked at the tune and I see nothing that would cause low fuel pressure. I would think it would do better on the stock cam anyhow so I am wondering if the hpfp was damaged on install or possibly installed incorrectly and became damaged.
First thing I asked is if they installed it with a lash cap. No lash cap with a Texas Speed cam and 32% overdrive. I guess the customer blew his stock LT1 and rebuilt it. Maybe it was damaged when the engine blew? Swapping it out now.Originally Posted by TriPinTaZ
Thanks for looking.
hello
I have a similar configuration
and it works fine.. very much like my map...
only difference .. most notable fuel pressure sensor / offset 12.5 / gain 8.75 ..
i desired fuel pressure/high flow 560 or 81.2
damn, swapped the high side pump out and same thing.
Anyone have any ideas? I'm out. Even the fuel pressure at idle seems real low. The low side is fine rocking 60psi or more all day. Trying to see if there is some sort of limiter, although limiting fuel pressure just seems like a bad idea in the first place
Last edited by JASON11WS6; 05-26-2022 at 02:57 PM.
Just removed the one way line hoping that would maybe be the issue. Same thing. The injector pulse width is in the mid 3s at idle. It's as if the ecm is ignoring the high pressure desired. Is there a way to log desired high pressure? I don't see the pid
Yes "desired fuel pressure" PID is the one for desired rail pressure.
Did you replace the low side to high side pipe that goes over the valve cover on the drivers side? That specific piece is problematic when raising fuel demand in pre 2017 model year cars.
A far fetched idea would be that the fuel lobe on the cam was ground incorrectly, flawed, or worn down.
Stupid question, but the lifter was removed from the bore and checked?
2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80
~Greg Huggins~
Remote Tuning Available at gh[email protected]
Mobile Tuning Available for North Georgia and WNC
Yes, looked good. Didn't see any issues
test less pressure required?
I had problems, sometimes, with a lot of pressure
Car is a 2018 so I don't think the pipe should be an issue. Even if it's a stock fuel lobe we should still have more pressure then this. We measured it and it raises about the same height as another car we had in the shop. Everything measures out on the mechanical side and we've replaced the pump, lifter and wiring harness for the injectors.
I put everything in the tune back to the stock settings except for idle and the maf. Same results
Okay, so I made a pull logging high pressure requested and it seems to be just sitting at the bottom of the desired fuel pressure table. Has to be tune related. The ecm seems to be reading the desired fuel pressure table wrong and pulling from .06-.09-.11 airmass range. Doesn't seem to read beyond that which keeps the high side under 1000 psi for the most part. The map sensor was replaced with a 3 bar but in the scanner I'm getting good readings. It reads boost and everything. Something isn't translating properly.
Any ideas?
Assuming the airflow model isn't way off as it doesn't look like it....have you tried setting the MAP config to NA-MAP instead of NA-TIAP? If the Airmass is reading that low, it likely has something to do with a MAP or MAF reading.
If you have the Factory tune file to compare to you might find the Airmass axis for the high pressure pump is not right.
I've found that axis is different for some 2018+ cars, if you're referring to ECM 17071. 2018+ range from 0.06 to 0.96 so anything above 0.96g Airmass uses the last row.
Here is an example of 2 2018s
In one that has extra decimal place 0.037 if you write 0.37 in its place it will never reach the bottom row.
Untitled.jpg
No, so the axis table was fine and the airflow model was on point. I'm sure there is a decimal point off on some field I can't find that does affect that chart.
I've tried switching the map config with no luck
Try adding the extra decimal to the axis, for example 0.096 and see if it help
Before I read this I just skewed the table so it would work and I was able to get the fuel pressure needed. I did notice something else funky. My HP scanner reads that the car is making boost at idle and that the car makes 11 psi at full throttle. Car is only making about 6 psi. Hooked up the scanner to another boosted LT car and it read fine. So some math has to be off somewhere in this tune I'm guessing.
I don't have stock file from this car. Can I take another stock 2018 Camaro 1Le SS file mod it how I want it and flash it? Or will I need to relicense it?
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