Nelson Tune for Stock 5.3

[Toadz]

yes i do call!!

fill out the form as best as you can, we will discuss the details once its submitted!
Thanks

Awesome, thanks. What kind of turn around time are we looking at?

[GasGuzzler]

There is no such thing as a tune optimized for 93 that works well on 87. That's dumb and would be called a fake tune where all that is done is pulling the speed limiter and upping the shift points.

[Toadz]

There is no such thing as a tune optimized for 93 that works well on 87. That's dumb and would be called a fake tune where all that is done is pulling the speed limiter and upping the shift points.

I'm talking about straight from GM. If you run 93 octane it will optimize timing for 93 but probably not as well as if the vehicle were designed specifically for 93 octane. Once you run 89 or 87 octane the computer will obviously detect the predetonation and reduce timing until it runs smoothly. I'm pretty sure someone on FullSizeChevy.com confirmed this. This is the computer age after all, I don't see a dual octane tune being impossible at all.

[GasGuzzler]

I'm talking about straight from GM.

Me too

If you run 93 octane it will optimize timing for 93 but probably not as well as if the vehicle were designed specifically for 93 octane.

No, it won't. If it would no one would sell tuning software and no one would make money using said software.

Once you run 89 or 87 octane the computer will obviously detect the predetonation and reduce timing until it runs smoothly.

Might wanna learn more about the IC and KS systems on these.

I'm pretty sure someone on FullSizeChevy.com confirmed this.

I wouldn't know. Confirm is a big word.

This is the computer age after all, I don't see a dual octane tune being impossible at all.

Dual tunes are not uncommon, 87/89, 89/91, 91/93 can be had...they are all compromises (READ not optimized) and there is no 87/93 which is the subject at hand.

[Toadz]

Give me a few days to do some research on this, I'm swamped with school work, I'll see what I can come up with. Maybe I was just reading a bunch of mumbo jumbo but it made sense. Manufacturers are using better technologies every year. Of course they aren't going to be the best for performance but it's possible they do use dual octane parameters in their computers. About the IC and KS systems, are you implying that you can't run 87 in a vehicle tuned for 93 octane from the factory? It says right in the manual that using 87 will not harm the engine but reduce performance.

[GasGuzzler]

Yeah and that vehicle (like my MIL's 07 supercharged GP) is not really optimized for 93, if it were, Dale, Allen, Virgil, whomever would not be able to find 30 HP in it by changing tables and it would rattle itself to death on 87.

[pl4yboy]

Yeah and that vehicle (like my MIL's 07 supercharged GP) is not really optimized for 93, if it were, Dale, Allen, Virgil, whomever would not be able to find 30 HP in it by changing tables and it would rattle itself to death on 87.

BAhaha, Like V's Tahoe on 87.

[fastlt1]

Why can't they tune WOT for 93 octane and part throttle and cruise for 87 economy?

[Toadz]

I am by no way saying that GM's PCM's are going to be the most efficient and put out the most power. I'm just saying that they will optimize for the higher octane but not fully.

[trx2stroke4life39]

Why can't they tune WOT for 93 octane and part throttle and cruise for 87 economy?

You can, but once you go to WOT with a tank full of 87 on a 93 WOT tune you will have nothing but knock. so to make that work you would have to have two separate tanks one for cruise and one for WOT. So it makes no sense at all to do it.