Tuning for more boost

[SonomaGTlover]

Ok... I have a quick question that I wasn't able to find an answer to.
Forgive me for the ignorance but I haven't been able to actually tune for over a year and I missed the boat. Anyway...

Now that I can actually tune my truck I have been messin around and it looks pretty good. I'll save it where it for daily driving, but now I want to move on to a higher BOOST tune and I'm not sure where to start.

Naturally I want to go about it the correct way so....
What do I add first? Boost, Timing or both?
Do I set the boost to say... 20 and advance the timing until I get a tiny bit of knock then adjust the AFR again? Obviously knock is bad but how much is too much?

I just don't know what order to begin changing things or how to tell where the timing should be set.

KrepinTY... if you see this, give me a call. (I lost your number in my old phone) I have my new Ostrich and it's time to do some tuning. Have you got yours installed yet?

 

[JSM]

Re: Tuning for more boost

I think how much boost really depends on what turbo you have and the goals with the truck. Also what gas you plan to run and if you have meth injection or not.

It won't do much good to spin a turbo way past the efficiency range. Stock turbo ~22psi is good, above that and be ready to take the heat out somehow.

I personally find what boost I want to run based on the combination, then add timing as i can. Take it slow.

 

[turbodig]

Re: Tuning for more boost

With unknown combos, I generally start with mild timing (14-16 degrees) until I'm sure the thing isn't rattling itself to death. Boost- as low as I can get it at WOT.

Once you're sure everything is stable, ratchet the boost up to your target. Then add timing.

As Jeff said, what gas you're running plays a big part of what you'll do. Whatever you use, don't switch around mid-tune. You'll drive yourself nuts.

Also, be advised that the winter/summer blend change is upon us, so you may have to tweak a tune once the gas changes. (Even out of the same pump)

 

[SonomaGTlover]

Re: Tuning for more boost

OK...thanks for the quick responses.

If I have it right, I want to set the boost at the desired level... (going with 20#)
Next add a little timing and finally correct the AFR.

I can add timng and correct AFR as long as I do not see knock.


For reference....
I have what I believe is a built motor (not sure since I bought the truck from 3rd party)
L35's that have been worked on
Stock turbo
3" exhaust (no cat and soon 3" DP)
3 bar with 50# inj

I think that's it so if I have it correct I'll see what happens. If NOT then please correct me so I don't screw anything up.

THanks again guys!!

 

[dgoodhue]

Re: Tuning for more boost

OK...thanks for the quick responses.

If I have it right, I want to set the boost at the desired level... (going with 20#)
Next add a little timing and finally correct the AFR.

I can add timng and correct AFR as long as I do not see knock.

I would slowly work on upping the boost. Ie if its at 15 psi right now add 1 psi at time take it for a run make sure the scan tool look clean and then go from their adding timing.