E67 tune - production vs Connect & Cruise

[AEH]

I need a little advice. I have a crate LSA and a 4L80. I bought the gm connect & Cruise engine control package from Gm and their transmission controller. Long story short, I wanted to run variable speed fan control which is disabled in the C&C ecms so I sent my ECM to a very reputable guy (that will remain un-named, at least for now) over a year ago and it appears I’m not getting it back.

So I need to replace it. My options are to try and get a replacement from gm or just get a junkyard ecm and have a ctsv or ZL1 production program loaded on it and start from there with a local tuner. I’m not sure what year/version (std vs automatic) of a production tune to get or does it even matter? For those with more knowledge and experience than me, which is likely everyone that reads this, what do you recommend? I need to end up with an ecm that can do variable speed fan, broadcast actual gear position to Dakota digital gauges, and has flex fuel option. Is there anything special in the C&C ecm that makes it compatible with GM’s trans controller? There is GM lan +/- in the bulkhead connection between the two but I’m not sure what data is passed.

I appreciate and insight you can provide.

[streetk14]

I know this probably isn’t very helpful at this point, but your situation is the reason I went with a production style E38 and a Speartech harness for my LS7 swap. I heard of too many weird tuning issues with the Chevy Performance stuff.

Since your trans controller is a standalone setup (right?) I’d think you’d want a manual trans setup on the ECU. Mine is programmed as a 2015 Z28, though I still ended up segment swapping the “system” portion of my operating system to get the pwm fans working right. Camaros all use relay controlled fans from the factory, and I couldn’t get HP Tuners to activate my PWM fans with the scanner commands. They may have worked with the engine running, but swapping that OS segment to an SS sedan version made it all work perfect.

Good luck. You might want to get with one of the swap specialists on this. I highly recommend Speartech, but I don’t believe they do any E67 stuff.

[AEH]

Thanks for your he reply. I believe the the trans controller is independent but not for sure. I know there is a lan connection between the two but I’m not sure what data is being passed, if at all, or which direction.

I’m locked into the e67 at this point for sure. I thought I had the pwm and my other concerns addressed but that plan didn’t work out.

[Samckitt]

I'm kindof in the same boat, only with manual transmission. Years ago i bought an LS3 Connect & cruise harness kit. I was under the impression the pwm fan control could be controlled by the GMPP E67 ECM. But no bueno. I have no physical proof, but from what I have found out the GMPP ECM is missing electrical components that control the PWM fan. I have also added an LSA supercharger, so I decided to find a VIN for a CTS-V with manual trans & order an ECM with the tune for that ECM. It runs, but has MIL because of missing sensors that I havent tuned out yet.

I got the ECM from https://www.flashmastersecm.com/.

[AEH]

Scot, it’s doable, at least it’s been done. Lou’s Change camaro started that thread on Lateral G on pwm fan control. I know you are familiar with that one. There were some that did and some that weren’t able to figure it out. It is possible to get PWN control with the GMPP ecm, I just lost my ecm trying.

I have an E67 ecm and a guy who can loan a stock program. Just need to decide what to have him load

[John McIntire]

Here is the thread on Lat-G Mike is referring to.

https://lateral-g.net/forums/showthr...&highlight=PWM

It's pretty long at this point, but I would recommend reading it in bits and pieces as if it was a book. There's a lot of good info in there.

There's a member on there with the name "mikels" that you will need to get ahold of. His name is Dave Mikels and is extremely knowledgeable in this department. He spent some time doing engine development and calibration for GM and now does it for Toyota. He actually went to college with Mark Stielow and Kyle Tucker, and you can make an educated guess on who tunes Mark's combo!

I've PM'd him a few times on this matter and he's always replied back to me with in-depth answers and explanations. He's the real deal and if anyone can do this for you, it would be Dave.

He said this feature can be activated on an E38 or E67 and recommend the GM harness and ECM as it is the best bang for the buck. I also have an LS7, but a smoking deal came up for the GM LS3 ECM and wiring harness awhile back and after consulting with Dave, he assured me it was the same thing as the LS7 package, just a different tune in the ECM and he could reprogram it for me to work properly.

So head over there and do some reading, and if you do reach out to Dave, let us know what he says!

Good Luck!

[AEH]

Yes sir. I have read it multiple times and I even think I understand it. The first 15 pages or so have most of the good relative to the GM ecms. Lots of good info later on fans and other platforms.

The way I understand it is that the GM engineers wanted to make sure you could not use a GMPP controller to run a production car and they limited some of the functionality to that end and for simplicity. There are several features they limited. pwm fan control is one. And according to Dakota Digital, the controllers don’t broadcast actual gear selected info so it’s not available for gauge display. That matters to me because I plan to use a Lokar Sport Shifter which has no mechanical gear indication.

That’s two reasons to go with a production ecm tune and modify. I have heard from several tuners that the GMPP tunes are very good right out of the box so I hate to give that up but a good tuner should be able to achieve equal or better results.

[Chevy Kid]

Some extra food for thought is to use a Dakota Digital gss-3000 neutral safety switch. This will give you neutral safety, back up lights, as well as an output for your gear indicator. Very easy to set up.

[icemanrd19]

Just get a gmpp ecu and tune it. You can add additional pin outs in the future and activate whatever you need. I also suggest going with pcm of nc ac bump and dual fan wiring controller. Zero issues keeping my car cool

[streetk14]

As far as the Chevrolet Performance ECU tunes go, they aren’t great. They’ll get the job done, but GM doesn’t tune the VE (speed density fueling tables) on any of them. I got a copy of the GM tune for my LS427/570, and it had a totally stock LS7 timing table. There is definitely room for improvement.

[Samckitt]

I have an E67 ecm and a guy who can loan a stock program. Just need to decide what to have him load

What would be the difference then in just using a stock (production car) E67 ecm with the OS on it for something that would work?

There's a member on there with the name "mikels" that you will need to get ahold of. Good Luck!

Sent him a private message a few weeks ago, so far no reply.

[AEH]

Scot, I can’t answer that question for you. I was hoping that some with more experience would chime in, as that was the jist of my origin post. I know what I gain with a production ecm, but don’t know what, if anything I’m giving up other than not having to go in and take out all the stuff I don’t need. I think Mikels is mia.

A replacement GMPP ecm for the LSA is $700. I bought a compatible E67 off eBay for $65 and I’m going the copy the program from a friends 2011 CTSV on it and go from there. It should get me where I need to be.

[Samckitt]

I did something similar, I got an ECM from Flashmasters, for a '10 CTSV with manual trans. It will run, but have to figure out what all needs turned off since I dont have all the supercharger sensors/wiring (but do have the supercharger).

[DocsTa]

FOLLOWING!
In the same situation, LS376/480 Connect and cruise, cam change and topped off with LSA. Getting conflicting information as to using GMPP and tuning to work with LSA.

[icemanrd19]

My setup started just like yours and now it’s on e85 with a magnuson 2.3. 2 plus years of boost and 800rwhp it’s fine

FOLLOWING!
In the same situation, LS376/480 Connect and cruise, cam change and topped off with LSA. Getting conflicting information as to using GMPP and tuning to work with LSA.

[Samckitt]

My setup started just like yours and now it’s on e85 with a magnuson 2.3. 2 plus years of boost and 800rwhp it’s fine

Using a GMPP Connect & Cruise ECM or production car ECM?

[DocsTa]

My setup started just like yours and now it’s on e85 with a magnuson 2.3. 2 plus years of boost and 800rwhp it’s fine

Going with the Kong X-port LSA and the suggested cam is a “She’s gone” spec’s by Matt Dedicated motor sports. Understand it will be similar power at rear wheel with moderate tune with conservative timing. States that it will have long term durability.

Are you running GMPP ECU or another, also did you have to repin the harness?

Thanks,
Doc