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View Full Version : Can EFI Live disable the VVT in an '08 E38?


cpwire
March 11th, 2009, 10:02 AM
I have a customer with a combination of an LS7 and a 4L80E transmission. The wiring is not a problem. The programming has been a big PITA!

The closest file I can get to is an Express van 6.0L with a 4L80E transmission. Problem is, the VVT. the LS7 doesn't have it, so we are trying to just shut it off. Can it be done?

Thanks for any help or thoughts.
GMPX
March 11th, 2009, 10:33 AM
It does make it tough when there is no factory combo to base a tune from.
Yes we could shut the VVT off, but I am not sure this is going to solve all your problems, it might be the start of many more.

Cheers,
Ross
MMLMM
March 11th, 2009, 11:53 AM
I have a customer with a combination of an LS7 and a 4L80E transmission. The wiring is not a problem. The programming has been a big PITA!

The closest file I can get to is an Express van 6.0L with a 4L80E transmission. Problem is, the VVT. the LS7 doesn't have it, so we are trying to just shut it off. Can it be done?

Thanks for any help or thoughts.

the 6.0 has a turbo?
GMPX
March 11th, 2009, 02:12 PM
Ah, always thinking Diesel you Duramax guys :)
VVT = Variable Vane Turbo, also means Variable Valve Timing for the gas engines.

Cheers,
Ross
cpwire
March 12th, 2009, 04:24 AM
It does make it tough when there is no factory combo to base a tune from.
Yes we could shut the VVT off, but I am not sure this is going to solve all your problems, it might be the start of many more.

Cheers,
Ross

It MAY be the start of many more, but I'd like to be able to find out for sure.
MMLMM
March 12th, 2009, 05:09 AM
Ah, always thinking Diesel you Duramax guys :)
VVT = Variable Vane Turbo, also means Variable Valve Timing for the gas engines.

Cheers,
Ross

Ahahahaha, I questioned myself if it could mean something else in the gasser word.
GMPX
March 12th, 2009, 10:21 AM
It MAY be the start of many more, but I'd like to be able to find out for sure.
Well, if you look in the software you can see there is the option to disable the VVT in a number of ways, the problem is that there is no E38 LS7 Auto file from GM.
You would need to start with a factory combo like a 2007 6.0L (E38) and matching 4L80E T42. It would be far less work to retune the 6.0L engine cal to suit the LS7 that go down any other path.

Cheers,
Ross
doubledip
March 15th, 2009, 02:05 AM
isnt the 4L80E just a beefed up 4L65E... if so why not start off with a Holden tune from a VZ Series 2 which is a L76 6.0L and 4L65E (so E38 and T42)..
joecar
March 15th, 2009, 10:02 AM
No the 4L80E is a different design... you need a 4L80E trans segment from a compatible file.
GMPX
March 15th, 2009, 10:25 AM
cpwire also contacted us via Email, best best would be to run an E38 with a Express Van TCM tune (T42, 4L80E).
doubledip
March 15th, 2009, 10:36 AM
oh ok.. so they are different... no worries...

good thing to know at least :)