Proper dyno tune sequence
Thread Starter
Joined: Nov 2009
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From: THORNTON, PA (NEAR PHILLY)
Proper dyno tune sequence So do you just keeping cranking the boost up until there really isnt anymore gains, and then move the timing/AFR around at that point or the other way around?
What if the turbo keeps making gains - do you keep going? I would think at one point the engine could let go right? I was going to put a little race fuel in the tank and see what my combo in the sig could do.
What if the turbo keeps making gains - do you keep going? I would think at one point the engine could let go right? I was going to put a little race fuel in the tank and see what my combo in the sig could do.
So do you just keeping cranking the boost up until there really isnt anymore gains, and then move the timing/AFR around at that point or the other way around?
What if the turbo keeps making gains - do you keep going? I would think at one point the engine could let go right? I was going to put a little race fuel in the tank and see what my combo in the sig could do.
What if the turbo keeps making gains - do you keep going? I would think at one point the engine could let go right? I was going to put a little race fuel in the tank and see what my combo in the sig could do.
With a crappo ebay IC and the same turbo my 5.3 stopped making decent power gains over 24lbs at 6700 or so. I'm sure the IC was eating up a few psi, but I'd guess a 6.0 would max out that turbo even earlier.
I'd dial upper boost level timing down to something silly safe like 10*. Make sure the AFR is dialed in and add boost until you stop seeing big gains. Then bump timing up until you stop seeing big gains. Stock 48 made some great power with that turbo and a baby cam on a 6.0. I think the turbo was done around 21-22psi.
Thread Starter
Joined: Nov 2009
Posts: 1,621
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From: THORNTON, PA (NEAR PHILLY)
Looks like a pretty mild combo.
With a crappo ebay IC and the same turbo my 5.3 stopped making decent power gains over 24lbs at 6700 or so. I'm sure the IC was eating up a few psi, but I'd guess a 6.0 would max out that turbo even earlier.
I'd dial upper boost level timing down to something silly safe like 10*. Make sure the AFR is dialed in and add boost until you stop seeing big gains. Then bump timing up until you stop seeing big gains. Stock 48 made some great power with that turbo and a baby cam on a 6.0. I think the turbo was done around 21-22psi.
With a crappo ebay IC and the same turbo my 5.3 stopped making decent power gains over 24lbs at 6700 or so. I'm sure the IC was eating up a few psi, but I'd guess a 6.0 would max out that turbo even earlier.
I'd dial upper boost level timing down to something silly safe like 10*. Make sure the AFR is dialed in and add boost until you stop seeing big gains. Then bump timing up until you stop seeing big gains. Stock 48 made some great power with that turbo and a baby cam on a 6.0. I think the turbo was done around 21-22psi.
Right now I'm running 12psi on the street. I also have a high boost setting of ~16.5psi.
Should I have 2 different tunes for each boost (timing mostly)? Only running around 12* to keep it safe.
I was a little nervous about more than 16psi let alone 20psi. What's considered "good gains"? Again, I'll splash some race gas in there. I have a meth system but my IAT's (130* on a warm day, little over ambient right now as its cold old) are so low that the meth doesnt seem to do much so I turned it off.
I wouldnt just throw race gas in for no reason. Tune the car how you are going to run it. If you just want to have some fun on the dyno and push it, go with some race gas like you were saying. But dont throw it in there and tune with it unless you plan on running a "splash" of race gas all the time.
Nail down the tune with the gas you want to run the car on. Then throw some race gas in have some fun with it, you can obviously keep both files.
Nail down the tune with the gas you want to run the car on. Then throw some race gas in have some fun with it, you can obviously keep both files.
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Thread Starter
Joined: Nov 2009
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From: THORNTON, PA (NEAR PHILLY)
I figure I could go a ways on 92 octane (93 avail in some areas). I was really concerned with boost first, then timing or the other way around.
So in other words, as you crank the boost-up, do you back the timing off each time and creep up on it again??? You could be there forever!
So in other words, as you crank the boost-up, do you back the timing off each time and creep up on it again??? You could be there forever!
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Verdad Gallardo I figure I could go a ways on 92 octane (93 avail in some areas). I was really concerned with boost first, then timing or the other way around.
So in other words, as you crank the boost-up, do you back the timing off each time and creep up on it again??? You could be there forever!
So in other words, as you crank the boost-up, do you back the timing off each time and creep up on it again??? You could be there forever!
I was averaging about 30hp/lb of boost up to about 16lbs. At 20lbs it was down near 10-15hp/lb. We quit turning it up. I let me tuner make the call on timing but that was the last thing we played with. I wont say where we ended up because it wont matter in comparison to your setup. Say, if you average 15hp/degree, stop once you start seeing it average 10ish and back it off a lil more.
Thread Starter
Joined: Nov 2009
Posts: 1,621
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From: THORNTON, PA (NEAR PHILLY)
Do what forcefed said, start out with low timing and low boost. Dial in your AFR and then start turning the boost up until you see diminishing returns. Once you do that, go back and start playing with your timing until you see smaller returns.
I was averaging about 30hp/lb of boost up to about 16lbs. At 20lbs it was down near 10-15hp/lb. We quit turning it up. I let me tuner make the call on timing but that was the last thing we played with. I wont say where we ended up because it wont matter in comparison to your setup. Say, if you average 15hp/degree, stop once you start seeing it average 10ish and back it off a lil more.
I was averaging about 30hp/lb of boost up to about 16lbs. At 20lbs it was down near 10-15hp/lb. We quit turning it up. I let me tuner make the call on timing but that was the last thing we played with. I wont say where we ended up because it wont matter in comparison to your setup. Say, if you average 15hp/degree, stop once you start seeing it average 10ish and back it off a lil more.
Go find out for us!
A lot depends in IC efficiency/pressure drop, cam, redline. My totally random guess is you’ll stop seeing decent gains around 19lbs if you rev it out to 6500..
A lot depends in IC efficiency/pressure drop, cam, redline. My totally random guess is you’ll stop seeing decent gains around 19lbs if you rev it out to 6500..
