Max boost on stock internals
 

With a FM II link and a good tune how much boost can you run on stock internals? 15? I've seen alot of people say 12 and others say it can run 15 fine.

A friend of mine has been running 15psi on his 95 with a Link and AVO turbo kit for 5 years now. He's got a very good tune IMO. Runs numerous track events and drives it on regular basis. I think the reality is - the more boost you run, the sooner the demise of your engine. BUT there are so many other variables in there that can lengthen or shorten that "deadline". I'd run 15 since I know somebody doing it with the same setup. And the fact that a 1.8 salvage engine is relatively cheap and simple to replace, makes it hard not to do.

Thanks alot for the info. Taking the car in on monday to finish getting it tuned. Going to do 15 PSI. Hopefully I can go to the dyno soon and see what I'm running.

Don't forget... turbo size makes a big difference in the PSI you can support. Its not PSI that blows motors... its HP/TRQ/Stress that kills them.

AVO system isn't the same as the fmII right?

no, not the same.

not the same but the avo kits used basically the same turbo. 15psi would be just fine.

im glad to hear this.:bigtu: so im not ass scared of doing this:crx:

Some AVO kits came with t25 but most with t28's, I have the t28 at ~10-11psi = 210rwhp, 15 should be about 250whp which is about the max for a stock engine

His peak rwhp number was 267. It was a real sleeper too, until he put the extraction hood on it. Just looked like a regular Merlot until he mashed the go pedal.

I did run 18psi on my 1.6L for 2 1/2 years and it lived through it all. Ran a 8.2 @ 88mph in the 1/8 mile with it too. It was a T3 S60 setup with a similar fuel system to what I have now. Was most likely around 260-270whp. It blew up when I spiked to 25psi ( MBC failure ) on the interstate @ 6500rpm in 4th gear.

15psi on a GT2560R is a lot different than 15psi on a 50 trim T04E...but either way it will live with good tuning. The strength of the B6 and BP engines are quite impressive.

Thanks for the info Andy :)

What is the most power you can run safely on a 01-05 vvt engine.
Is 240 safe?

20Gs

Do u think many others know where 20gs came from in this regard?

Isn't that why it's funny?

90 Turbo, all Miata motors (90-05) will withstand around 250whp and 225wtq. Above that, reliability begins to suffer. You cannot use a boost level to describe engine reliability.

i mean it's funny to us specials who get the joke :)

Its normally the rods that gives these stock engines trouble isnt it? And those are normally busted by the torque right?
Would pushing the power band higher (through a intake manifold with shorter runners) lower the peak torque slightly, allowing more high end power while reducing stress on the rods?

technically.

So you'll drop a ton of money and R&D just to save yourself the "headache" of putting trouble free rods and pistons in?