LS7 ECU interface questions.

[Steve_D]

Has anyone investigated fitting aftermarket rev limiting and perhaps traction control and interfacing it with the GM LS7 ECU?

It would seem perfectly possible with an aftermarket ECU but I'm told there is no way of connecting/interfacing to the GM ECU.

Regards
Steve

[craig7l]

yes...race logic traction control to LS376 GM ECU

[crafty]

Steve,

You will find a definitive answer at one of these 2 forums.

http://www.ls1tech.com/forums/pcm-diagnostics-tuni...
http://www.hptuners.com/forum/

[MarkWebb]

Have just taken delivery of Racelogic traction control all be it for an SBC. but the only connection to the ecu is to divert the injector trigger wires through the TC ecu. Works on bank to bank and sequential injection systems.

[738 driver]

I think Lingenfelter and MSD offer plug n play launch controllers for GM ECU's.

[MarkWebb]

Steve
Racelogic has launch control rev limiting and adjustable full throttle gear change if you want it.

[Steve_D]

Thanks for the info guys.
have mailed Racelogic to see what they can offer.
Sounds promising though.

Steve

[Steve_D]

Have had a reply from Racelogic which indicates it could be possible but the answer came with some questions which I'm hoping someone can answer.

• Does the engine management system use pulse width modulation on the injector signals to control/limit the injector current?
• Does the engine management system have peak and hold injector drivers?
• What ohmage are the injector signals?
• Does the engine management have misfire detection?

Does anybody know?

Steve

[738 driver]

Google ' gm_ecm ' have a look in 'GM ECM info' tab.

good luck.

[Andi82]

Hi Steve,

has there been any development?
Could the questions be answered by the factory?
It would be very interesting to get launch control for the GTR.

[V8 Vum]

Heck,

I hope we can have some answers for this as I have had a racelogic unit for about 3 years now, but I did not expect it would be an issue....I have an LS7 with GM ECU, and am busy fitting the engine at the moment...seem to take far longer than I though especially with all that extra wiring and stuff....

I just hope that it will be worth all that trouble and expense, and I would hate to think I have wasted my money and time with the RaceLogic bits!....


I will be keepingh a very close eye on this thread.....Guys let me know....

cheers

Keith

[MarkWebb]

I am told that in general the racelogic system works on production ecu's but not on some aftermarket ones. I was lucky because it does work with my FAST ez-efi system.
V8 VUM isn't your system a spark interrupt one? if so none of the questions apply. I may know somebody in the US who can answer this. PM me if you need me to ask

[V8 Vum]

OK, I have been in conflab with Mike Broadbent at Racelogic, and so that we all can make informed decisions, here is is answer (with his blessing) in full. - for me, it is a relief!

---

From Mike:
There are quite a lot of LS7-engined cars using RLTC to my knowledge, and there should not be any compatibility issues with the injector signals and the standard GM ECU.

The confusion may lie in the fact that whenever I am asked if our system will work with an engine that has been heavily modified, had bigger injectors fitted and different aftermarket management to run it all, I always ask a set of questions relating to the injector signals. However I don’t think this applies in your case.

Essentially, RLTC works only with standard, saturated injector signals with no lower impedence than 4ohms. The management system must not be running misfire detection that it would act on – putting the car into limp-home mode, for example.

Whenever someone enquires about fitting a system to a car that has been heavily modified, I will always need answers to these questions before I can advise further:

• Does the engine management system use pulse width modulation on the injector signals to control/limit the injector current?
• Does the engine management system have peak and hold injector drivers?
• What ohmage are the injector signals?
• Does the engine management have misfire detection?
• How many injectors are you using?

---

And so, my take on this is, that thier system WILL work OK on a std GM ECM, however heavily modded engines and ECMs may be a problem...

Mine is Std, so I IS HAPPY!

Keith

[V8 Vum]

So Steve....go for it!
Or, you can wait a while to see if mine works!

Keith

[Steve_D]

V8 Vum said:

So Steve....go for it!
Or, you can wait a while to see if mine works!

Keith

The question was in support of a customer request. Other issues have prevented that build going ahead so I will watch what happens with yours.

Steve

[bluesatin]

This may help with AS LS7 engines and racelogic

To answer your questions.
1. Does the engine management system use pulse width modulation-- yes
2. Does the engine management system have peak and hold injector drivers? We don't know. It is high impedance.
3. What ohmage are injector signals? 14-16 ohms
4. Does engine management have misfire detection- yes
5. We use 8 injectors

[spatz]

HI Steve

have a look at the DTAS80PRO, it offers traction control of all 4 wheels and many more features.
There is a solid starting map from them for LS7 that was mapped with my engine which is stock apart from the intake manifold
and accessories that are not ECU related.
I am using mechanical throttle. So no fly by wire control but manifold pressure to control the engine.
Can imagine that a electronic gas might improve repsonse to the gas pedal but at the moment I am all happy
with my mechanical throttle.