PDA

View Full Version : 2007 COS 2 Bar Turbo Truck


Mike@Vengeance
March 9th, 2012, 09:52 AM
Guys wanted to see if anybody has the answer for this.

2007 Silverado 408 TURBO.

OS 12597120

There is obviously no COS I can use on the truck OR is there. Can it be swapped out to somehting else.

We really need to 2 bar this truck so we can get some Fuel Transisition going.

Can I run a 2 bar sensor and cut the MAP table along with the VE in half basically making 100KPA only 50KPA. So that at 100KPA I would have 200KPA for real???

Has anybody ever tried this?
GMPX
March 9th, 2012, 10:41 AM
That is how it used to be done before any 2bar solution existed. I know out here in Australia it worked ok, well, better than as it is, but this was also on cable throttle cars, I don't know how it would go on an ETC car.
joeygc5
March 14th, 2012, 03:27 AM
I tuned with the modified map scaling on a turbo 8.1 running 14lbs. The resolution and mid throttle transitioning left a lot to be desired. The computer for whatever reason would only run open loop with the 2004 cos for that pcm. Hence the return to stock os and modified map. I then went to a 2005 8.1 os and went cos5 with no issues. If possible I'd suggest trying a 05-06 os and using th available cos for that earlier os. Is this an ls1 pcmb, or an e38/67?
ScarabEpic22
March 14th, 2012, 09:37 AM
Its probably an LS1B 1MB PCM because E38s can do 2.5Bar on factory OSs.

Good point though, I dont know what platform changes occurred between 05 and 07, but there are a few COSs for 05 trucks...
Mike@Vengeance
March 23rd, 2012, 04:17 AM
Guys its 07 classic style truck

Originally came with a 4.8 L

The 0S just does not match up with anything.
Chevy366
March 23rd, 2012, 05:46 AM
Guys its 07 classic style truck

Originally came with a 4.8 L

The 0S just does not match up with anything.

Tune repository has it as a ; 2007 Express Van Auto 6.0L (LQ4) LS1B 776k, http://www.tunefiledepot.com/index.php?option=com_content&view=article&id=4&Itemid=3&Manufacturer=3&VehicleType=P&Stock=Y
joeygc5
March 26th, 2012, 11:18 AM
Guys its 07 classic style truck

Originally came with a 4.8 L

The 0S just does not match up with anything.

Have you thought about reverting to a slightly older os which offers COS functions? The only thing that sucks is the copy paste functions of all the tables.
tirefryin_s10
January 26th, 2016, 03:36 PM
bump any more info on doing this?
blazinblue
June 23rd, 2016, 06:11 PM
bump any more info on doing this?

i think you might have to go with a 05 gas pedal and tac module, then flash a 2005 COS