How much Boost is safe on a stock engine. - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


DIY Turbo Discussion greddy on a 1.8? homebrew kit?

Reply
 
 
 
LinkBack Thread Tools
Old 12-11-2006, 05:58 PM   #1
Junior Member
Thread Starter
 
Join Date: Dec 2006
Posts: 209
Total Cats: -1
Default How much Boost is safe on a stock engine.

From what I have seen and read 12 psi is completely fine on a stock engine and really if you want anymore power you have to get forged pistons and rods. Can a stock engine handle like 15 psi? If it can how well can it handle it. If you run 8 or 12 psi usually then boost up to 15 sometimes would it hurt?
ak47bravo is offline   Reply With Quote
Old 12-11-2006, 06:01 PM   #2
Senior Member
 
Join Date: Jan 2005
Posts: 737
Total Cats: 0
Default

I ran 18psi on my 1.6L for 2 years and 40k miles. It blew up when I spiked to 25psi...but I have no reason to not believe that it would still be alive today had that not happend. it had 110k on it when the piston just exploded and sent my #3 rod though the oil pan.
F20turbo is offline   Reply With Quote
Old 12-11-2006, 06:03 PM   #3
I'm Miserable!
 
Join Date: Dec 2006
Posts: 212
Total Cats: 0
Default

What about the 323 GT-X. How much boost did they come with from the factory?
iluvtruenos is offline   Reply With Quote
Old 12-11-2006, 06:04 PM   #4
Senior Member
 
Join Date: Jan 2005
Posts: 737
Total Cats: 0
Default

323GTX had 7.9:1 pistons ( hypereutectic cast ) and beefier connecting rods ( ones I currently have in my 1.9L). the 323GTX seems to be able to handle 400whp otr 25psi whatever comes first.
F20turbo is offline   Reply With Quote
Old 12-11-2006, 06:47 PM   #5
Junior Member
Thread Starter
 
Join Date: Dec 2006
Posts: 209
Total Cats: -1
Default

Wait Andy did you run 18 psi on stock internals?
ak47bravo is offline   Reply With Quote
Old 12-11-2006, 07:12 PM   #6
Senior Member
 
Join Date: Jan 2005
Posts: 737
Total Cats: 0
Default

Quote:
Originally Posted by ak47bravo View Post
Wait Andy did you run 18 psi on stock internals?
yeah, for 2 years.
F20turbo is offline   Reply With Quote
Old 12-11-2006, 07:16 PM   #7
Senior Member
 
Join Date: Oct 2005
Location: Knoxville
Posts: 1,168
Total Cats: 0
Default

wow 18psi on a stock 1.6! that's the highest I've ever heard for a car that actually had miles put on it. what turbo and how much power? what kind of engine management?
Al Hounos is offline   Reply With Quote
Old 12-11-2006, 07:23 PM   #8
Senior Member
 
Join Date: Jan 2005
Posts: 737
Total Cats: 0
Default

Quote:
Originally Posted by Al Hounos View Post
wow 18psi on a stock 1.6! that's the highest I've ever heard for a car that actually had miles put on it. what turbo and how much power? what kind of engine management?
Combination of 2 turbos...one was a T3 S60 48/60. The other was a T04E 40 trim .48 stage 3 turbine. I ran the S60 for 1 1/2 years and the 40 trim for 6 months or so. I also ran a Greddy before that @ 15psi. Mind you I bought a lot of race gas to run these pressures...but thats when it was 3.30 at the pump. I ran 12psi 1/2 the time and 18psi the other 1/2 of the time.

This was on the same fuel setup I have now, minus the 330's...I was running 270's from a KA24DE. Engine was perfect until the day it died, still had 170-165-170-170 compression across the board ( 3 days before the engine blew ). If it wasnt for that 25psi spike in 4th gear I think that little 1.6L may still be kicking.
F20turbo is offline   Reply With Quote
Old 12-11-2006, 07:53 PM   #9
Junior Member
Thread Starter
 
Join Date: Dec 2006
Posts: 209
Total Cats: -1
Default

So Andy you think with an Fm II turbo kit I could run 15 Psi pretty easy? On stock internals. If I did I wouldn't do it all the time. Just whenever a mustang wanted to race haha
ak47bravo is offline   Reply With Quote
Old 12-11-2006, 08:08 PM   #10
:(
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default

yeah hell he runs it with stock ecu a linked car can run 22 psi before the em runs out of head room normally past 15 psi there has been a tendecy for parts to weatr out according to FM but i dunno seems to be more of a maintenance issue.
magnamx-5 is offline   Reply With Quote
Old 12-11-2006, 08:16 PM   #11
Senior Member
 
Join Date: Oct 2005
Location: Knoxville
Posts: 1,168
Total Cats: 0
Default

Quote:
Originally Posted by AndyFloyd View Post
Combination of 2 turbos...one was a T3 S60 48/60. The other was a T04E 40 trim .48 stage 3 turbine. I ran the S60 for 1 1/2 years and the 40 trim for 6 months or so. I also ran a Greddy before that @ 15psi. Mind you I bought a lot of race gas to run these pressures...but thats when it was 3.30 at the pump. I ran 12psi 1/2 the time and 18psi the other 1/2 of the time.
Very interesting, and tempting. Unfortunately I will run out of injector by about 14-15psi. I'd love to pick up some 650cc's and a 3071R and some WI an see how far I could take the stock 1.6 on pump gas.

18psi, stock ecu, stock engine, 270cc injs...You don't really like to play by the rules, do you?
Al Hounos is offline   Reply With Quote
Old 12-11-2006, 10:29 PM   #12
Junior Member
 
Join Date: Oct 2006
Posts: 312
Total Cats: 0
Default

I ran 15 psi on stock internals with no difficulty. I know I was running 18 psi for a while, but I cant remember which motor I did it on. I think it was the built motor.
beerslurpy is offline   Reply With Quote
Old 12-11-2006, 10:58 PM   #13
Newb
iTrader: (1)
 
Join Date: Dec 2006
Posts: 40
Total Cats: 0
Default

you where talking about 323 gtx pistons. Then have those in my car and everything is fine with 18 psi
SPEEDSTER44 is offline   Reply With Quote
Old 12-11-2006, 11:24 PM   #14
Senior Member
 
Join Date: Mar 2006
Posts: 1,379
Total Cats: 1
Default

Quote:
Originally Posted by ak47bravo View Post
Wait Andy did you run 18 psi on stock internals?
So did I. It was 18 psi on a stock 1.8 with a CA spec FM-II however and put well over 13k miles, until an overrev killed the motor. Ric Stevens was running 24 PSI on a stock 1.6 junkyard motor.
Markp is offline   Reply With Quote
Old 12-12-2006, 01:55 AM   #15
Senior Member
 
Join Date: Nov 2005
Location: Baltimore Maryland
Posts: 1,010
Total Cats: 8
Default

I think a lot has to do with the fueling and tuning.....
airbrush1 is offline   Reply With Quote
Old 12-12-2006, 05:03 AM   #16
Junior Member
 
Join Date: May 2005
Posts: 93
Total Cats: 0
Default

Quote:
Originally Posted by airbrush1 View Post
I think a lot has to do with the fueling and tuning.....
so true - many a good engine has been killed well before 18PSI with poor tuning.
miatamad is offline   Reply With Quote
Old 12-12-2006, 07:34 PM   #17
Senior Member
 
Join Date: Nov 2005
Location: Baltimore Maryland
Posts: 1,010
Total Cats: 8
Default

..... 12psi here...... muahahaaaaahaahahaaaa Posting dyno scans in a few minutes
airbrush1 is offline   Reply With Quote
Old 12-12-2006, 08:05 PM   #18
:(
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default

where?
magnamx-5 is offline   Reply With Quote
Old 12-13-2006, 11:41 AM   #19
Senior Member
 
Join Date: Jan 2005
Posts: 737
Total Cats: 0
Default

Quote:
Originally Posted by Al Hounos View Post
Very interesting, and tempting. Unfortunately I will run out of injector by about 14-15psi. I'd love to pick up some 650cc's and a 3071R and some WI an see how far I could take the stock 1.6 on pump gas.

18psi, stock ecu, stock engine, 270cc injs...You don't really like to play by the rules, do you?
Rules are meant to be broken
F20turbo is offline   Reply With Quote
Old 12-13-2006, 12:13 PM   #20
:(
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default

AS well as records speed limits egos etc.
magnamx-5 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 57 07-19-2017 05:11 PM
OTS Bilstein to motorsports ASN conversion stoves Suspension, Brakes, Drivetrain 5 04-21-2016 04:00 PM
WTB MP62 (Hotside) (NB2) Rick02R WTB 3 01-03-2016 08:18 PM
Expected intake temps on the track? tazswing Race Prep 20 10-03-2015 12:04 PM
Going back to stock. Need some 1.6 parts. Trent WTB 2 10-01-2015 01:15 PM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 06:02 PM.