help with a ls1 that won't run after tune.

[GsxrHammo]

Hi
I have been building an ls1 twin turbo for a while and it has been idling/running on a NA tuner locked file, all the way through the build. Long story short I don' t have that tune anymore since its locked and i can't read it, I started with a stock tune. After writing a tune and adjusting injector size up and down and playing with things i shouldn't, i can't get it to run. It fires here and there and sometimes sounds so close but doesn't idle. Is there something in the tune I am missing before I start pulling things part. 3bar SD tune with 650cc injectors. I appreciate any help ls1 turbo 650cc no maf.hpt

[Ziller]

Did you get it sorted ? What fuel pressure do u have ?

[GsxrHammo]

I have 58-60psi on 1:1 fpr
Still not running. I haven't had a chance to look at it this weekend.

[blindsquirrel]

If you have a 1:1 referenced regulator why do your injector tables have data set up for non-referenced/returnless?

What injectors are they? Did they come with data?

Never seen a MAP sensor that uses 305.00/10.33 for linear/offset.

[GsxrHammo]

Because I don't really have a clue what I am doing. The injectors did come with data but I have been playing with the values to try and get it to start.
When I changed to 3 bar sd it changed the map sensor settings. I don't have any other data to put there. It is a ac delco OEM P/N 12592525

[blindsquirrel]

You can get the correct linear/offset for the LSA MAP sensor from a stock tune file from the repository for a car that came with an LSA. I already know what the specs are, but you need to learn this. Take that part number, go to a parts site with a decent catalog. Look up what applications used that sensor. Then go to the repository and find a file for one of those listed vehicles. Look up the linear/offset in the stock file.

Injector data, like the MAP sensor specs, and cylinder volume, and firing order, is not a tuning aid. The specs for an injector are the specs for that injector.

What data did the injectors come with? All the necessary info for a GM PCM, or just flow rate? Is this data proprietary? Can you post the datasheet so someone can look to see if it all got entered correctly?

[GsxrHammo]

Thanks guys. It was injector data. They didn't come with all the data. Minimum pulse and adder. It idles and runs now.
Thanks again

[village_idiot]

There's still a lot of simple changes that need to be made to make your life simpler.

Did this car originally have a manual trans?

Post the latest tune file, and I'll modify several things that need addressed. You can pull it up as a compare file to see changes.

[GsxrHammo]

There's still a lot of simple changes that need to be made to make your life simpler.

Did this car originally have a manual trans?

Post the latest tune file, and I'll modify several things that need addressed. You can pull it up as a compare file to see changes.

Hi mate,
Thanks for your help. No it was an auto originally now its t56.
here is the tune now. it idles high 1500+rpm when rolling but once you come to a rest it dies down to normal idle.
ls1 turbo 650cc 2.hpt

[AnimateMe]

I have a TKO behind my 5.3L swap and it was originally a 4L60. I'm using the factory PCM/OS from the 5.3L donor 04 Avalanche. My idle does the same thing as yours, hangs while rolling and doesn't drop until I come to a stop. I'm thinking it's the throttle follower (which I haven't messed with yet) so I'll be watching this to see what you come up with for a fix.

[slarsen47]

I have a TKO behind my 5.3L swap and it was originally a 4L60. I'm using the factory PCM/OS from the 5.3L donor 04 Avalanche. My idle does the same thing as yours, hangs while rolling and doesn't drop until I come to a stop. I'm thinking it's the throttle follower (which I haven't messed with yet) so I'll be watching this to see what you come up with for a fix.

I have gone the other way from a M6 to a A4 using the segment swap feature and it worked perfectly.

Perhaps a segment swap is needed to go from A4 to M6??

[GsxrHammo]

Thanks I'll give the segment swap a go see if it fixes the high idle while rolling.

[Alvin]

I have a TKO behind my 5.3L swap and it was originally a 4L60. I'm using the factory PCM/OS from the 5.3L donor 04 Avalanche. My idle does the same thing as yours, hangs while rolling and doesn't drop until I come to a stop. I'm thinking it's the throttle follower (which I haven't messed with yet) so I'll be watching this to see what you come up with for a fix.

Those usually have a ton of timing in decel which causes a hanging idle.

[AnimateMe]

Thanks Alvin. When I get to working on the hanging idle issue I'll start my own thread if I can't figure it out. I've only been working on dialing in the VE so far.