Safe boost level? Searched could not find answer.

[Uncle]

So gents and you too tippy,
I’ve bolted my engine back together for it’s fist event last weekend after doing the EFI swap. We ran the car on what I would call a Paris Hilton tune. Rich and retarded. With the boost limited to 1 bar it made 387rwhp@5,500RPM with it strapped down very tightly..
Anyway the engine is a stock bottom end late 3.3 with ported heads,964 cams,ARP head studs,3.2 manifold, Haltech ECU,LS coils,BW366, TIAL gate and a very effective WTA intercooler set up. In 3hrs on the dyno intake temps between 32c and 38c. It was tuned on our 98 octane so about 93 octane over there. I have a flax fuel sensor so do plan to run e85.
So what’s considered “Safe”? I can keep the AFR’s in the right place, feed it all the fuel and the engine has knock control. The turbo will take all the PSI's I can throw at it so that won't be an issue.

My thoughts are 1.2bar on PULP and 1.4 on e85 keeping RPM limited to ~6,000.

Thoughts?

[Uncle]

Graph's

[xbmwguy]

Hey uncle. Given what parts you have at 14.5 psi you should be in the 400+ club.! you didn't mention are you twin plugged? What turbo? Alot of the big ones don't start making good power til over 1.1-1.2. can you post a timing table? I'm running 1.3 as my daily tune on corn juice, and that's 630 rwhp

[Uncle]

Hey,
Still running single plug. Turbo is a BW366 that really wants 19psi to start working for its money. I can’t post the timing table right now as it’s on my home laptop and I’m at work.
As for the numbers that dyno is a heartbreaker and as I said the car was strapped to not walk up on the leading roller. The real tell was the car ran the mph at the event over the weekend to say it has 400+rwhp. Anyway dyno numbersshmumbers lol. So long as I can run good times at 1,000mtr sprint events that’s all that matters!
My question is considering I’m not running big rev’s and all the infrastructure is there for fuel and spark are my safe boost numbers in the ballpark.

[Uncle]

Have also posted this in the engine forum.

[Tippy]

I'm am the LAST person to ask on this board what is safe....I push the envelope too much. HEHE

For those cams and everything else you have, your powerband indicates your cams are timed too advanced.

964's shouldn't fall off at 5500. My stock 3.2 cams (same profile as SC) went to about 6200 before falling off.

Maybe Chris Carroll or GJF who have tuned a lot of 930's can chime in what's safe.

[kenikh]

Add a second plug and knock control and 1.4 BAR could be yours. That's doable, but boosting that high is not "safe"... just manageable, with no fail margin.

[Uncle]

LOL that's why I said "and Tippy".

You could be right in cam timing. We just placed them at the same position as the stock 930 cams.

[Uncle]

Originally Posted by kenikh

Add a second plug and knock control and 1.4 BAR could be yours. That's doable, but boosting that high is not "safe"... just manageable, with no fail margin.

It has a good knock control set up in it now with the Haltech. I'm thinking 2nd plug might be my next project.

[Tippy]

Originally Posted by kenikh

Add a second plug and knock control and 1.4 BAR could be yours. That's doable, but boosting that high is not "safe"... just manageable, with no fail margin.

I agree and that's what I run.

[GJF]

Are you still running factory rod bolts?

[Uncle]

Yep.

[GJF]

Unfortunately it isn't how much boost, its how much power can the factory rods handle. Safely, about 400HP. With good rod bolts 600+. It's not the boost that is the deciding factor but rather the limits of your turbo. It's a nice larger frame turbo that can handle 1.4 bar without any issues. But your rods can't. Rod bolts at the least aftermarket rods even better, it's just extra insurance. Factory rods are heavy and a bit challenged by design. But for what they are they are pretty stout with good hardware and prep work. You can hit 650HP with single plug the advantage of running twin plug is less required timing for the same HP. It is a benifit, just added expense.

[kenikh]

Everything can grenade a motor. Knock kills first and nothing exacerbates knock like too much boost and/or timing. With factory rod bolts, I'm not exceeding 1 BAR.

[Uncle]

Originally Posted by GJF

Unfortunately it isn't how much boost, its how much power can the factory rods handle. Safely, about 400HP. With good rod bolts 600+. It's not the boost that is the deciding factor but rather the limits of your turbo. It's a nice larger frame turbo that can handle 1.4 bar without any issues. But your rods can't. Rod bolts at the least aftermarket rods even better, it's just extra insurance. Factory rods are heavy and a bit challenged by design. But for what they are they are pretty stout with good hardware and prep work. You can hit 650HP with single plug the advantage of running twin plug is less required timing for the same HP. It is a benifit, just added expense.

Great info there, thanks! Looks like I’d better start collecting more parts.

[Tippy]

Dying to see your AFR's and timing for your numbers

[Uncle]

You can see the AFR’s in the dyne screen. 10.5’s to 11.0 all the way across.

[Tippy]

Originally Posted by Uncle

You can see the AFR’s in the dyne screen. 10.5’s to 11.0 all the way across.

What's your timing?

[Uncle]

Still at work. Laptop’s at home.

[Tippy]

The WTA IC sounds neat, have you posted pics of the install?