Injector flow rate OR Cylinder gain?

[Frosty]

Set your injectors to their actual value and then use this guide if you want everything else to work correctly http://www.grandprixforums.net/threads/94283-The-defacto-guide-to-tuning-your-car-for-e85 ....... Im a little biased though.

 

[BrandonHall10]

Set your injectors to their actual value and then use this guide if you want everything else to work correctly http://www.grandprixforums.net/threads/94283-The-defacto-guide-to-tuning-your-car-for-e85 ....... Im a little biased though.

And I may also try that. I like the idea of my IFR number matching what I actually have physically installed in the car.

But that leads me back to my OP. What is "cylinder gain?" Can someone explain it to me?

 

[timboku]

And I may also try that. I like the idea of my IFR number matching what I actually have physically installed in the car.

But that leads me back to my OP. What is "cylinder gain?" Can someone explain it to me?

Not.to.thread jack.but where is this cylinder gain in dhp? It looks like under injector skew but in dhp the value is 100. Do we change this to 120?

 

[Frosty]

But that leads me back to my OP. What is "cylinder gain?" Can someone explain it to me?

It will let you trim individual cylinders fuel ratio. Useful if you have a manifold design that doesn't feed evenly or one cylinder runs hotter then others.... ect ect. For 99.9% of people it should be set even across the board. For us its useful for if you max out your IFR table or want to run e85!

 

[Frosty]

Not.to.thread jack.but where is this cylinder gain in dhp? It looks like under injector skew but in dhp the value is 100. Do we change this to 120?

If there are six of them and they are all set to 100 then that sounds correct.

 

[timboku]

If there are six of them and they are all set to 100 then that sounds correct.

Yes cylinders 1 through 6. Looks just like your pic in hp but numbers different.

 

[BrandonHall10]

So, let's say for example, I want one tune for E85, and one for 91. Based on the "Frosty" method;

1.) I would set the IFR to 42.5 across the board (I'm running lucas #42.5's) for both tunes. Then on my E85 tune, I would set the cylinder gains to 1.225, and set them to 1.0 for gasoline?
2.) Also assuming I would need/want to adjust the cyl gain on the E85 tune to "center" my trims around zero. (That value would be dependent on ethanol content, right?)

 

[Impala131]

It will let you trim individual cylinders fuel ratio. Useful if you have a manifold design that doesn't feed evenly or one cylinder runs hotter then others.... ect ect. For 99.9% of people it should be set even across the board. For us its useful for if you max out your IFR table or want to run e85!

Too bad we can't monitor KR per cylinder (as far as I know), or it might be more useful. More fuel could possibly be added to the middle (hotter) cylinders to reduce knock if those cylinders are prone to it. I know that the newer 5.0 mustangs often have heat/detonation issues with cylinder #8, which tuners sometimes compensate for by adding more fuel to that particular cylinder. Probably not much to gain on our platform, but hey, enthusiast problems.

 

[Frosty]

Pretty much. I usually leave it at 1.2 all winter and 1.25 all summer. It varies a bit but nothing the stock fuel trimming cant handle.

 

[BrandonHall10]

Sounds good. Thanks!

I've been debating buying one of those fuel testers...

http://www.quickfueltechnology.com/specialty-parts/echecker---e85-fuel-test-tube.html

 

[darkhorizon]

Go back to a stock tune and set the lean code to no reporting if it bothers you.

 

[Reptile]

Right, because that code will never come in handy in the future in case you have a real problem.