Need help with turbo tune on a truck

[Ladyredhawk]

I haven't tuned a truck or one with a turbo yet and will need to do one tomorrow.

Does anyone have a tune I can look at and see what I might need to do.


2003 Chevy 1500 4 x 4 Extended Cab Truck
Stock 5.3L engine.
SVT Turbo for "stock" application
44LB injectors with after market fuel pump.
3000 Stall converter.

Any help to get me in the ball park would be GREATLT appreciated.

[Ladyredhawk]

Got her done! lol All went well.

[joecar]

LRH,

I was going to suggest www.holdencrazy.com, but looks like you got it nailed; good job...

Are you tuning on a dyno, what HP/TQ numbers did you get...?

Cheers,
Joe

[Ladyredhawk]

LRH,

I was going to suggest www.holdencrazy.com, but looks like you got it nailed; good job...

Are you tuning on a dyno, what HP/TQ numbers did you get...?

Cheers,
Joe

Dyno numbers where 379RWHP/471TQ, not bad, they said it dyno'ed 230HP stock. I didn't lock the converter up or lock it in 3rd gear so he just "eased" into the throttle.

The only real confusing thing for me was, I tuned it for 16 degrees of timing, but it would start out at 21 degrees at 3500 rpms and then would go down to 16 degrees. I made sure it was in PE mode and everything else I could think of.....I was wondering if there was a table I was missing that is different than the f-bodies and Corvettes that I am use to??

[kbracing96]

Cool, any info on this SVT turbo kit, I've not heard of them before? Is it custom, or a kit? Any pics, links? Thanks

[Ladyredhawk]

Cool, any info on this SVT turbo kit, I've not heard of them before? Is it custom, or a kit? Any pics, links? Thanks

lol It turns out it was a STS kit. I was told wrong about that at first and had me wondering what it was too. lol

What did your truck dyno at?

[kbracing96]

LOL, I could see how one could make that kind of a mistake The last time I had it on a dyno, was before the cam and meth, and running 7lbs on the stock 4.8, it got 352rwhp and 386rwtq.

Those are some pretty nice torque number you got there

[Ladyredhawk]

LOL, I could see how one could make that kind of a mistake The last time I had it on a dyno, was before the cam and meth, and running 7lbs on the stock 4.8, it got 352rwhp and 386rwtq.

Those are some pretty nice torque number you got there

I didn't get to see the chart, those are the numbers they told to me (I was in the passenger seat busy tuning lol). I bet the high tq number was probably from a spike because it shifted on the dyno. That is one reason I was curious to see your numbers. Would have been better if it was locked in 3rd and the converter locked up, but that is hard on the tranny and they didn't want to take the chance.....

[joecar]

The only real confusing thing for me was, I tuned it for 16 degrees of timing, but it would start out at 21 degrees at 3500 rpms and then would go down to 16 degrees. I made sure it was in PE mode and everything else I could think of.....I was wondering if there was a table I was missing that is different than the f-bodies and Corvettes that I am use to??

There's a lot of spark modifer tables...
Could try logging some of the the EST_* pids, these show where the various additions/subtractions to timing are coming from.

[kbracing96]

Here's my graph, you can see where the converter locked.