It’s never just a tune

[aaronatstate]

[quote=""Monochrome""]My code for the Active Exhaust isn’t as great as stock.... That was the only big thing.

I do need to fix this for the 5 or so people in the entire world who run AE.[/quote]

The fix should be easy, tell them to delete AE If they are putting an ECU in from a different model vehicle they obviously are not concerned with keeping it stock...

[Monochrome]

[quote=""aaronatstate""]The fix should be easy, tell them to delete AE If they are putting an ECU in from a different model vehicle they obviously are not concerned with keeping it stock...[/quote]

Well I advertise the ECU as a stock replacement and most of our customers now don’t even care for the flash tuning potential. They literally buy them because their stock ECUs were destroyed by leaky caps.

[Monochrome]

[quote=""DCIV""]That would be amazing. I bet tickets would be cheap. I though you were only like 3/4 hours from me for some reason though. Last time the TN crew had Ray out we rented out a dyno in Knoxville and had like 3 of us do it. If I could set that up
would you be game for something like that? Paul has a flashed ecu, I do, I bet Scott might do it, dwain if he’s feeling well (he’s got cancer), I might be able to sneak brent away for it.


Coop[/quote]

It would be awesome to just come out and hang out! Since NG and BRG are out, I can't ever see you guys anymore. You got my number still? Let's set something up.

[quote=""aaronatstate""]I would still be super interested in this (and I think other people would as well). The GM flex fuel sensor scaling is known, so it should be fairly straight forward to get the tuning done.[/quote]

Well... No. Not exactly.

Adam built this nifty bench ECU setup which can feed straight voltage or even frequency voltage into the board. The first challenge is figuring out what the code registers 0-5V. Each driver is slightly different.

The code reads from 0-FF (0-255). We have to log that input for that the pin with EVOScan while feeding voltage to it to see if 0 volts is truly 0 and 5 volts is FF. It never is but that's the first step.

Then I have to write the code for a new table which then gives the user the ability to take that hex number, and have it translate it to a percentage based on the scaling of the sensor they're using (which is what you know for your GM sensor). This is how the other logged inputs work for boost and AFR in Chrome V2.

Then comes the hard part.

Manually tuning the modifier value for the alcohol percentage BEFORE linking it to the new table to see if that modifier value is going to do exactly what we need.

This takes a lot of driving under all conditions, with different fuels and different weather... This means your car must be tuned perfectly before we begin so that the only variable is that Ethanol modifier.

I went thru all this when setting up the boost and AFR tables in Chrome V2 but was able to do so on my own car at midnight on a Friday during the slim times I wasn't working... The problem is I don't have a car anymore (and won't be getting one), everyones car is in pieces, doesn't run right or they have no clue what's going on... That's where this all falls apart.

[DCIV]

I don’t. PM the number. I know Paul is talking about a grill and chill.

Coop

[aaronatstate]

[quote=""Monochrome""]Well... No. Not exactly.

Adam built this nifty bench ECU setup which can feed straight voltage or even frequency voltage into the board. The first challenge is figuring out what the code registers 0-5V. Each driver is slightly different.

The code reads from 0-FF (0-255). We have to log that input for that the pin with EVOScan while feeding voltage to it to see if 0 volts is truly 0 and 5 volts is FF. It never is but that's the first step.

Then I have to write the code for a new table which then gives the user the ability to take that hex number, and have it translate it to a percentage based on the scaling of the sensor they're using (which is what you know for your GM sensor). This is how the other logged inputs work for boost and AFR in Chrome V2.

Then comes the hard part.

Manually tuning the modifier value for the alcohol percentage BEFORE linking it to the new table to see if that modifier value is going to do exactly what we need.

This takes a lot of driving under all conditions, with different fuels and different weather... This means your car must be tuned perfectly before we begin so that the only variable is that Ethanol modifier.

I went thru all this when setting up the boost and AFR tables in Chrome V2 but was able to do so on my own car at midnight on a Friday during the slim times I wasn't working... The problem is I don't have a car anymore (and won't be getting one), everyones car is in pieces, doesn't run right or they have no clue what's going on... That's where this all falls apart.[/quote]

I would still be willing to tackle this at some point in the future if you ever want to revisit it. I think my car is tuned about as well as it could be.

[ChargerX3]

[quote=""Monochrome""]My code for the Active Exhaust isn’t as great as stock.... That was the only big thing.

I do need to fix this for the 5 or so people in the entire world who run AE.[/quote]

Im one of those people then...lol. Still have 2 cars that use it.

IIRC you also talked about issues with the EVO MAF and a new OEM upgrade. I believe all of us were using incorrect MAF size, scaling, and correction numbers. I think you had figured those all out, but were waiting to share them all.

[J-Groove]

All I know is, THANK YOU for this work Greg. My car consistently runs, performs, and is drive able. My car feels, starts, runs, and drives like a stock car, just turned up.

I've driven many 3S cars that are hard to drive and manage, and I'm faster than them.

So THANK YOU!

I'm with Aaron, the only thing I would like is a flex fuel setup. Would make roadtrips much easier.

-John

[aaronatstate]

[quote=""J-Groove""]All I know is, THANK YOU for this work Greg. My car consistently runs, performs, and is drive able. My car feels, starts, runs, and drives like a stock car, just turned up.

I've driven many 3S cars that are hard to drive and manage, and I'm faster than them.

So THANK YOU!

I'm with Aaron, the only thing I would like is a flex fuel setup. Would make roadtrips much easier.

-John[/quote]

I second this. My car starts up with zero issues, like a stock car, and drives like a stock car, just turned up as well. I won't say my tune is getting every single bit of hp out of the motor, but it is safe, and I do not see knock even when it is 105F outside temps.

[aaronatstate]

Also Greg, just curious, if flex-fuel ever did become an option, could you have it change the stock boost control stuff as well? I would definitely switch to stock boost control if that was the case, because I could never run more than 14-15psi on 91 octane here, but I can run 19.0-19.5 all day (and with more timing) on E85.

[Jeff V.]

I don't see why you couldn't have two boost control tables and interpolate between them based on your octane value. That's basically how the stock fuel and ignition tables work.

[Monochrome]

[quote=""Jeff V.""]I don't see why you couldn't have two boost control tables and interpolate between them based on your octane value. That's basically how the stock fuel and ignition tables work.[/quote]

Exactly. Just replace that octane value with ethanol. Easy.

[aaronatstate]

[quote=""Monochrome""]Exactly. Just replace that octane value with ethanol. Easy.[/quote]

Ah, so was your plan to use the low octane table for gas, and the high octane table for E85, thus really eliminating the knock sensor stuff altogether?

[Monochrome]

Correct. Same with the fuel and timing maps.

[aaronatstate]

Would you still be able to knock if you had done this, just it wouldn't affect timing etc.?

[Monochrome]

[quote=""aaronatstate""]Would you still be able to knock if you had done this, just it wouldn't affect timing etc.?[/quote]

Octane interpolation of the tables is a completely different function than knock sensor enrichment and timing retard. You would not lose that.

Think of Knock retard like a short term fuel trim and octane is a long term fuel trim.

[aaronatstate]

[quote=""Monochrome""]Octane interpolation of the tables is a completely different function than knock sensor enrichment and timing retard. You would not lose that.

Think of Knock retard like a short term fuel trim and octane is a long term fuel trim.[/quote]