Random syty engine/boost question...

Anarchy99

New member
What's the max boost you'd run on a built syty 4.3 engine, with 93 octane and meth injection, but no intercooler. Run it off the wastegate spring?
 

Quickstop [UK]

Combating adversyty.
Re: Random syty engine/boost question...

Picking a number would be inadvisable. You'd be better off tuning it and monitoring for knock. Qbnkiller ran a truck with no intercooler and he was fast. Look at his threads for an idea.
 

Anarchy99

New member
Re: Random syty engine/boost question...

Thinking of tossing a built 4.3 into a different, rather small application, intercooler wont fit so I figured I'd ask.
 

TYTILIDIE

METH HEAD
Re: Random syty engine/boost question...

Mark is absolutely right. The number is meaningless if you aren't tuning it right. Some guys make more power at 18psi even if they are capable of 24psi.
 

Anarchy99

New member
Re: Random syty engine/boost question...

Yeah, I wouldn't send it north of 15 PSI regardless... just don't need it in this application. Was mainly wondering if people had a number they thought would be fine. We'll see I guess.
 

TYTILIDIE

METH HEAD
Re: Random syty engine/boost question...

Just start with 1 psi and go til you get knock. Then tune the knock out and keep going until you either aren't making power or can't keep knock away. You're set on a number, you really shouldnt. It's what the truck wants.
 

Anarchy99

New member
Re: Random syty engine/boost question...

Not really set on a number, 18 came out and that was way more than I wanted to do anyways. I'll just toss it in and go from there.
 

Slyclone

Well-known member
Re: Random syty engine/boost question...

I set my truck up on a pte 39 mm WG. I used a 10# spring on a 61mm precision turbo.

The #10 was way more aggressive then the small factory turbo with 15~psi.

The 10# was a safe route to go. Plus my brother got his hands in my wastegate box and took all my springs. When he took them he took his car to get dynoed and they dyno guy took all my springs. I flipped out @ my brother.it was a real rude thing to do on both ends. Tuner @ my brother. You know I bought the whole kit with all the springs different Colors/combos. He said he'd replace them but it's been like 4 years and he hasn't even driven his car in the same amount time.
 

Anarchy99

New member
Re: Random syty engine/boost question...

Yeah, mine kind of went the other way... when I moved from Memphis to Virginia Beach, I opened my tool box when I got here and had tons of my brothers tools in my box. He's a mechanic. I think over the years in Memphis I never really noticed a wrench here or socket there but once everything was tossed in, I guess I just kind of opened it one day and realized I had a ton of his. So my brother story kind of went the other way. We laugh about it now though. The wastegate and turbo size I was going to use is comparable to what you used. Trans will be a built 200-4r so the tv cable setup will still be used.
 
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