In need of a TUNE...
In need of a TUNE...
Moderator
Joined: 05-01-2014
Posts: 8,499
From: California
You already saw this thread, must have missed all the tunes that 2005 attached to his posts.
https://www.chevyhhr.net/forums/2-0l...61/#post917893
https://www.chevyhhr.net/forums/2-0l...61/#post917893
Senior Member
Joined: 12-05-2014
Posts: 3,330
From: Northern Ohio
If you’re gonna tune anyway, might as well throw in a set of 3-bar MAP sensors (which require a tune,) and use the GMTU or one based upon it. You will have more choices.
I want an (up to) 25 psi tune that will tolerate 87 octane E10, or E85. I believe my 2010 SS already has compatible injectors. That leaves the fuel pump and fuel level sensor to figure out for corrosion issues. IDK is anyone can write a FlexFuel-like routine for sensing ethanol %, or if it’s even possible with the ECM. I do know that the LHU, a FlexFuel variant of the LNF, was used in Regals, Veranos, and Saabs
I want an (up to) 25 psi tune that will tolerate 87 octane E10, or E85. I believe my 2010 SS already has compatible injectors. That leaves the fuel pump and fuel level sensor to figure out for corrosion issues. IDK is anyone can write a FlexFuel-like routine for sensing ethanol %, or if it’s even possible with the ECM. I do know that the LHU, a FlexFuel variant of the LNF, was used in Regals, Veranos, and Saabs
Senior Member
Joined: 03-08-2008
Posts: 301
From: los angeles
A friend of mine suggested adding the flex fuel sensor to my SS should be a relatively easy mod and he thought the code was already in the ECM and would just need to be turned on. But he spends his days hacking diesel ECMs so his idea of simple is different from most.
Senior Member
Joined: 12-05-2014
Posts: 3,330
From: Northern Ohio
Beyond that, over my head. IDK if it’s possible to add such a routine to the SS ECM. But it would be more than your typical tune. I mentioned the LHU above so we know that GM knows how to do it. Might take a more robust ECM, IDK. I speculate that had the SS continued beyond 2010, it might have gone FlexFuel.
There is such a thing as a dual tune for two different fuel fills, switchable by hijacking one of the dash buttons. Shouldn’t be hard to find with some googling.
BTW, you could check with the Cobalt LNF community (2008-2010 Cobalt SS,) as there are somewhat more LNF Cobalts than HHR SS’s, and a robust if waning tuner community.
Senior Member
Joined: 03-08-2008
Posts: 301
From: los angeles
The thing about Josh is he knows things other people don't and he knows people who probably worked at GM on this project. It's the same ECM in the SS and the non SS and probably the same OS, just with different features enabled. That's pretty common in the world of automotive ECMs. If I wasn't in CA, I might let him have a go at adding the sensor and enabling that feature. Just because no one has done it, doesn't mean it can't be done. He's done a lot of thing in the diesel world that couldn't be done and he drive a full self driving 2019 Dodge Ram 2500, something that couldn't be bought from the factory. He did all the integration between Comma-AI and the Dodge so he could have that.