Anyone Used or Tuned The New GM 376/480 Controller # 19258268??

[Mike Norris]

I have a customer in Kansas building a last minute SEMA car and I will be heading that way to tune it. he sent the ECM to me to put in a base program and instead of the older 19207190 unit it has this new part number 19258268 that came with his kit.

They are both E67's but there are about 300 differences in the cals from the older 7190 to this new 8268. The minimum airflow tables are WAY different. The ETC scalar on the new unit is about 20% larger and on and on.

I have not used one of the new units even on a regular 376/480 and this will be an aggressive 418ci LS3 with about 12 PSI, so you can see I am a little cautious just to jump in cold and no data.

If someone has used this new setup and it runs just fine on an LS3 out of the box, or at least runs, at least I should be good to do a base tune and see what I get.

Any info is appreciated.

Mike Norris

[alan91z28]

could you post the file that came with it.

does it have the improvements for removal of the 512 g/s restriction on MAF tables, etc?

[edcmat-l1]

I have a customer in Kansas building a last minute SEMA car and I will be heading that way to tune it. he sent the ECM to me to put in a base program and instead of the older 19207190 unit it has this new part number 19258268 that came with his kit.

Mike Norris

Mike, I'm not sure on the PN, but if you give me the OS number I'll see if I have something on it. I've done a crap load of the GMMP controllers.

[alan91z28]

ok so i took a chance and assumed maybe GMPP added the improvements to this OS like is in their current vette and camaro E38 OS and ordered a programmed E67 from the dealer

i just picked it up and the great news is that it does indeed have the improvements of 4000 g/sec MAF table, expanded fuel injector limits to 16 g/sec, etc...

So this should be a great controller now for stand alone FI applications without needing scaling, etc... my '85 IROC with the previous LS376 controller was hitting the 512 MAF limit, etc with only 5 lbs on the maggie (566 rwhp on mustang dyno)

So a couple of questions if anyone knows-

1. Anyway to tell what 90mm throttle body this is programmed for. The previous GMPP OS was for the older 90mm
2. Is there a way to write this OS to a "standard" E67 controller vs having to buy it programmed from GM... ie could it be written to a LS9 vette loaded one, etc... Right now to the best of my knowledge you cant get the Tech 2 to program GMPP OS and have to buy it special load

So know i have some updating to do to plug it into my IROC, but this looks like a good base controller

Thanks
Alan

[LSX378]

ok so i took a chance and assumed maybe GMPP added the improvements to this OS like is in their current vette and camaro E38 OS and ordered a programmed E67 from the dealer

i just picked it up and the great news is that it does indeed have the improvements of 4000 g/sec MAF table, expanded fuel injector limits to 16 g/sec, etc...

So this should be a great controller now for stand alone FI applications without needing scaling, etc... my '85 IROC with the previous LS376 controller was hitting the 512 MAF limit, etc with only 5 lbs on the maggie (566 rwhp on mustang dyno)

So a couple of questions if anyone knows-

1. Anyway to tell what 90mm throttle body this is programmed for. The previous GMPP OS was for the older 90mm
2. Is there a way to write this OS to a "standard" E67 controller vs having to buy it programmed from GM... ie could it be written to a LS9 vette loaded one, etc... Right now to the best of my knowledge you cant get the Tech 2 to program GMPP OS and have to buy it special load

So know i have some updating to do to plug it into my IROC, but this looks like a good base controller

Thanks
Alan

If it has 16g injectors then 09+ TB. But call GMPP and confirm as they are very helpful usually. And it is their product .

[alan91z28]

The only number i have for GMPP is the one on their web 800-450-4150 and they are not able to answer any real technical questions

I did try this and they said that call center could not answer any question like that and suggested i try and go through my dealer!

[Mike Norris]

Thanks guys and I did a little more research and realized it was pretty much a 2010 Camaro LS3 program (E38) morphed into the E67. It has the ETC scalar for the newer TB. So I went ahead and made my "normal" changes and we will see.

What I did find odd was the Base Running Airflow-Airflow Final Minimum tables. I attached the base GMPP file for y'all to look at.

Mike Norris

[DSteck]

Airflow Final Minimum matches a stock 2010 Camaro file that I had exactly. The 376/480 file I worked with was all sorts of screwed up... This newer one is odd in that it runs the same idle speed at all temperatures (I don't like doing that). It's the same startup airflow as the 2010 file as well though. I'd be surprised if the 376/480 engine actually starts properly with that file. It's interesting that it's set to pure MAF mode right out of the gate.

I find it curious/odd that the control methods for the rev limiter are all set to disabled.

Seems kind of half-assed just like the original 376/480 controller.

[alan91z28]

Mike,

So the LS376 that you are working with came with the new TB from the factory?

That makes sense, it just is unfortunate that GMPP doesn't publish a little more information regarding their controllers and needed hardware match ups. If you look at their docs still today that they give out you would be hard pressed to find anything in a write-up!

Thanks

[LSX378]

The only number i have for GMPP is the one on their web 800-450-4150 and they are not able to answer any real technical questions

I did try this and they said that call center could not answer any question like that and suggested i try and go through my dealer!

ROFL: dealer? I guess GMPP lost the people that could answer the questions in the financial crisis.

Maybe GM Powertrain know? If they have anyone left that can answer trick questions.

[Mike Norris]

I did not get the engine nor supply the ECM, I am just doing the tuning to get the car ready for SEMA and a race event after. It will be using the later gold blade TB.

Some of the past GMPP crate engines came with a new gold blade TB installed on them and an older silver blade TB in a box to be installed to work with the past E67 ECM's supplied with the crate engines. With the new ECM calibration they can run the newer (and cheaper) TB. Less waste there.

It is still all jacked up.

DSteck, not sure what 2010 SS program you look at but every one I have had is filled top to bottom with numbers in the Airflow Final Minimum table whereas this one is pretty much empty with the exception of the bottom rows and very random numbers.

We will see in a week or two.

Mike Norris

Mike,

So the LS376 that you are working with came with the new TB from the factory?

That makes sense, it just is unfortunate that GMPP doesn't publish a little more information regarding their controllers and needed hardware match ups. If you look at their docs still today that they give out you would be hard pressed to find anything in a write-up!

Thanks

[DSteck]

I'll post a compare when I get home. The final airflow minimum in the file you posted wasn't empty anywhere.

[DSteck]

Here's what I show for airflow final minimum:

[LSX378]

Here's what I show for airflow final minimum:

Looks like that one has the correct memory address of the table from a later beta.

[DSteck]

I'm using 2.23.426.

[Mike Norris]

Odd for sure as my base 376/480 read that I posted shows nothing in the 1st through 6th gear rows except for two cells in 4th gear. Then there are numbers (in g/sec) in Netutral, Reverse and Park ranging from 123.52 to 0.02.

I am using beta 2.23.333 and maybe it is presenting it incorrectly.

The table you posted is just the same as a 2010 or 2011 LS3 Camaro for sure.

Time to do a little digging I guess.

Mike Norris

[alan91z28]

mike, i had the same trouble as you at first with this OS when i got it this week... i upgraded to the current beta and it is good

[Mike Norris]

Thanks!!

[alan91z28]

also just as an update, i have been able to take this new GMPP OS and i am using the pedal from the original GMPP kit and now the newer "gold" 90mm throttle body on my LS376 TVS2300 '85 Iroc since this weekend

by using the compare function with my old file i moved most of the parameters over other than selectively keeping some from this new GMPP OS and also using directly the ZR1 OS fuel injector params since the axis is the same in this new OS.

i still have tuning to do (MAF only currently), but in general everything works and drives well. The big advantage is that this has the restriction on MAF airflow and fuel capacity upgraded so no scaling needed to support bigger flows

[alan91z28]

Quick question on the Scanner... i have this OS running pretty well now, but the max MAF (SAE) i see is 655 g/s even though the MAF Hz is clearly reading past that.

I did a search and i found one post where bill mentioned that the MAF PID only read to 655 g/s...

can anyone elaborate further, ie is this GM's restriction and it pretty much is what it is?

has anyone done a transfer function using a curve fit type formula and read the hz converted to MAF g/s... ie what do you guys with higher boost look at on your scanner

thanks
alan