NA Pistons and cams in a Turbo motor?

s383mmber1

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supra_kid101;904509 said:
Wow i'm the only guy with N/A cams and pistons in a GTE block?! This is cool lol!!! Anyway I have a 2mm MHG and ARP's along with N/A pistons and N/A cams. Detonation isn't a problem as I'm running 13psi on 89 octane. I get full boost as 2800rpm on a shimmed ct26 and 3" turbo back exhaust. I love the car.

89 octane with NA pistons? Id have to say your pretty stupid to be putting in 89 octane.....

Im running NA pistons and NA cams. Its very responsive, and very very quick. But if i had to do it again, i would definatly have done turbo pistons.

I run 93 everyday.
 

TRACKMKIII

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s383mmber1;906384 said:
89 octane with NA pistons? Id have to say your pretty stupid to be putting in 89 octane.....

Im running NA pistons and NA cams. Its very responsive, and very very quick. But if i had to do it again, i would definatly have done turbo pistons.

I run 93 everyday.

Why would you go back to the turbo pistons?
 

Quin

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Pistons are made out of the same stuff, IIRC. Only difference is the NA isn't dished for lower compression.
 

Dan_Gyoba

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Lower compression, higher boost. Higher boost means more O2, which means more fuel, which means more potential power. That is, assuming equal maximum cylinder pressure.
 

Quin

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Higher compression also means more O2, but also limits the amount of boost you can run safely.
 
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s383mmber1

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TRACKMKIII;906494 said:
I don't think the Higher C/R is the biggest problem I think it is all about tuning.

For moderate power goals, yes.

For 500+ RWHP NA pistons are still going to be a weak point, no matter what the tune may be.
 

TRACKMKIII

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s383mmber1;906593 said:
For moderate power goals, yes.

For 500+ RWHP NA pistons are still going to be a weak point, no matter what the tune may be.

I wouldn't want to do 500+ rwhp on a stock turbo or N/A piston. By the time you reach that level I think it would be time for a piston that was stronger than stock or at least have the pistons coated with some kind of thermal barrier.
 

s383mmber1

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TRACKMKIII;906605 said:
I wouldn't want to do 500+ rwhp on a stock turbo or N/A piston. By the time you reach that level I think it would be time for a piston that was stronger than stock or at least have the pistons coated with some kind of thermal barrier.

Hence the reason in my original post why i said i would not have gone with NA pistons if i could do it all again.

ANd good luck getting over 350 hp with the stock turbo....

Not very easy!
 

Dan_Gyoba

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Quin;906486 said:
Higher compression also means more O2, but not nearly as much as boost
How do you figure?

More boost is cramming more air into the cylinder, thus more O2. More compression doesn't draw in more air, it only brings the air that the engine's displacement brings in to a higher pressure before igniting it.

In order to get more O2 and burn more fuel, you need to either increase the manifold pressure, or increase the displacement.
 

Quin

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Compression raises pressure, you just answered your own question. It doesn't pull more in by itself but it allows more to fit in the cylinder.
 

CSquared

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Glad we've finally got some good technical discussion going on... but here is/was my question... On this particular motor I am aiming for 300-400whp (It will most likely will only see the stock turbo which would be sub 350whp, but I am thinking about a 57 trim down the lines depending). I also intend to run about 14lbs of boost.

For those particular goals... Are the NA pistons safe or worth it?

s383mmber1... What kind fuel management are/were you running with the na pistons? What kind of boost did they see?
 

supraguru05

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Quin;906698 said:
Compression raises pressure, you just answered your own question. It doesn't pull more in by itself but it allows more to fit in the cylinder.


no

think about it a little more how does air get into the cylinder
 

supra_kid101

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89 octane with NA pistons? Id have to say your pretty stupid to be putting in 89 octane.....

Im running NA pistons and NA cams. Its very responsive, and very very quick. But if i had to do it again, i would definatly have done turbo pistons.

First off I don't really appreciate being called stupid. Theres no reason to be negative to another person here. What I do with my car is my decision not yours. If I thought for 1 second it would hurt it I wouldn't.

Secondly for whoever wanted to know my computer is the stock ECU.

Finally if you plan to have high boost in the future N/A pistons probably aren't for you. I chose them because I wanted to try something different. I'm happy with it and wouldn't change anything. If I end up blowing it up at least i'll learn it's limits then move on with another project. Just my .02.
 

s383mmber1

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cramerizking;906709 said:
s383mmber1... What kind fuel management are/were you running with the na pistons? What kind of boost did they see?

I ran it last summer with the following mods:

NA block and head with MHG.
ct26 at 13 PSI
BIC DDP
Intake
and intercooler pipes and a huge front mount

No fuel managment, all stock, not even a wideband and the car ran fantastic.

My new setup is:
Same block and head, internally stock 7mge with MHG
CT26-57trim
Dual exhaust
FMIC
Innovate lm-1 wideband
Fuel controller
550cc injectors and lex AFM/or VPC

And of course, many many MANY more things ;)
 

Quin

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supraguru05;906943 said:
no

think about it a little more how does air get into the cylinder



Quin;906698 said:
Compression raises pressure, you just answered your own question. It doesn't pull more in by itself but it allows more to fit in the cylinder.
 

CSquared

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s383mmber1;907185 said:
I ran it last summer with the following mods:

NA block and head with MHG.
ct26 at 13 PSI
BIC DDP
Intake
and intercooler pipes and a huge front mount

No fuel managment, all stock, not even a wideband and the car ran fantastic.

My new setup is:
Same block and head, internally stock 7mge with MHG
CT26-57trim
Dual exhaust
FMIC
Innovate lm-1 wideband
Fuel controller
550cc injectors and lex AFM/or VPC

And of course, many many MANY more things ;)
Awesome... I was starting to get down on the idea but you've def sparked my interest again.

Thanks.