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I am having exact same issue with my LS7/4L70e swap in a chevelle, also used PSI for harness ECU and TCM, this is the 3rd set of ECU's and TCM's jhon sends me due to various issues and with this last...

Mike Thank you my friend for all your help, I will check plugs tonight and work on my timing tables.

cheers!
Andy

Road I really don't know much about what the tuner did on the Dyno to be honest, I dropped the car off on a Saturday and went to run some errands then picked it up and it was running better than with...

Road! that worked! but still have a stumble when I throttle it anything else you see wrong?
attached is the new 2 mile run and tune

I have fast intake, stock LS7 injectors, 102mm NW TB,...

thanks Road I will try this and let you know, my tuner apparently set this to 0 for whatever reason....I compared another file I had before my tuner messed with it and its got numbers on it I will...

Thanks 2X I tried this, had the main breaker off all night and same result today...
no idea what can cause this issue...

Hello Everyone:

I have a '72 chevelle with an LS7/4L70e.
car was running great until last Sunday when I went on a long drive approx. 150 miles and my intake tube came off my throttle body for...

Thank CSTune for you reply.

The car at WOT yes shifts 1-2 at around 4000 or so and 2-3 also around the same.
But it will not downshift at all at any speed unless I come to a full stop.

Also...

Hello Everyone;
I just took my Chevelle for a ride for the first time after an LS7/4L70e swap.

The transmission is brand new and upgraded to handle the power, I bought the transmission from...

Hello Everyone;
I just took my Chevelle for a ride for the first time after an LS7/4L70e swap.

The transmission is brand new and upgraded to handle the power, I bought the transmission from...

Where are you located bud?
Have instagram?

DS she started and idles pretty good! she starts on the second try, don't know why..
Anyway Im posting a quick scan for you to see.I cant thank you enough for all the help you have given me,...

DS im sorry for my ignorance but Im new to HP tuners, which is the MAF table I need to multiply by 1.25?
I also saw in your tune you pit the ETC scaler at 6300? Everyone has said to be 7100 + for a...

Ok i will try and let you know in a bit thanks a lot bud..

I have the mass air in a 4" housing.

Thanks DS I will try this later on today and yes it has a mass air sensor (card style) , I was away this weekend.
Should I do a write entire or write calibration?

Thanks again for all your help.

Ok got stock GM injectors on and Aftet a few tries it starts and idles somewhat smooth.
What should I move to next?
Since this tune I have is basically for a stock LS3 should I copy the LS7...

Hi bud thanks for taking a look at it.
Yes motor is all stock except for the upgrades I mentioned before.
Should I use the numbers from the hp tuner tune repository file?
I noticed various...

Thanks DSteck for your advise, I believe OS is 2008 corvette according to the HP tuner calibration details.
Let me know what you see when you are able to open the file.

Thanks! cheers.

Hello Everyone;

I am new to the tuning community and eager to learn.I am building a '72 chevelle and dropped in a 2006 LS7/dry sump with a 4L70e trans.
I bought the ECM/TCM from PSI conversion...