RE: Stock 1.6l w/FM2 kit, mechanical limits with regard to boost and advance?

Tue, 27 Jul 2010 21:47:59 -0700

i dont build or race miata's, but I did have a turbo 1.6 with the "prehistoric package" of j&s knock guard, afpr etc. and got it to 11.5psi boost (117psi rail pressure) at normal timing because the knock guard pulled timing so fast at the high det rpms, it worked. i should have never touched that car after that. it was quick and reliable.  but because of the J&S, detonation was hardly a factor.

i had a turbo'd miata friend coming to my house whose piston broke due to detonation he didnt hear.

from all the discussion over the almost 15 years i have followed this, 15psi is where it gets dicey. things start happening fast, and tuning is trickier. maybe its not science and maybe you dont like the order that i assemble my words, and hey if you get a chuckle, no charge.

but i maintain that you need to be careful when applying a turbocharger anyway. and after the mid teens on boost, with these engines, you need to get real careful.  my advice to a noob would be to inch your way up like I did, and think about risk/return after 14-15 psi.

nuff said




-------- Original Message --------
Subject: RE: Stock 1.6l w/FM2 kit, mechanical limits with regard to
boost and advance?
From: "Jeff Abrams" <[email protected]>
Date: Tue, July 27, 2010 9:27 pm
To: <[email protected]>

I can’t help but chuckle whenever I see people use “limit” and unqualified “boost” in the same sentence. Then again, these are often the same people that believe that detonation is somehow directly tied to manifold pressure.
“Boost” is a symptom, not a cause.
Hopefully, Corky will chime in here about flow.
 
 - Jeff Abrams
 - [email protected]
 - www.mazdamaniac.com
 
 
 
From: [email protected] [mailto:[email protected]]
Sent: Tuesday, July 27, 2010 9:02 PM
To: MataPowerList
Subject: RE: Stock 1.6l w/FM2 kit, mechanical limits with regard to boost and advance?
 
i been following this since Christ was a corporal, and a properly tuned 15psi has always been the safe limit that I have heard of.    on a 1.6 thats about 220rwhp.
 
these normally durable engines are very unforgiving of detonation under boost.
 
a set of low comp pistons and better rods really pays off if you can sustain the cost of those and a rebuild.
 
 

> On Jul 27, 2010 [email protected] wrote:
>> My question is what are the safe limits of boost and ignition advance
>> one can run when there's enough octane to not knock? When do the rods
>> and/or pistons give up on the stock 1.6l?
>
> The general feeling seems to be that once you start exceeding 250 rwhp
> (at stock rev limit) you should worry about the life of your rods.
>
> Not sure about pistons -- most failures of those that I've seen on the
> net seem to be head/detonation-related, rather than power.
>
> --Ian
> _______________________________________________

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