Thread: 9 psi with an NA

Would i beable to run a turbo with 9 psi on a l26 with msd ignition, custom powerlogs, 65# injectors, and a CAI?

If tuned properly. Probably.

9PSI isn't a lot. I was running 11 on my L26 with a topswap.

I only have 42.5# injectors, I don't know why you couldn't get away with the same.

You'll probably want to replace the timing chain and put a higher pound spring in the heads.


Last but not least, ditch the MSD coils for stock, they are notorious for having issues.

If you're going with 65# injectors or larger, you may as well run E85 thus giving you more headroom with boost at that compression ratio.
Now the transmission is a different story.

9 psi if tuned right, looking at high 12's. May want an intercooler, get a decent core and then piping from ebay to keep it around $300-400 total for an a/a.

M90 boost #'s are irrelevant to turbo boost #'s, many things that change.

My L26 was running 15psi with any issues..... before trans failure.

Hey victor, i was looking at your cardomain site of the Prix and noticed you had a custom tune. Did you get a custom dyno tune or did you get a canned tune?

Why are the msd coils bad?

They fail more than stock ones, can cause misfires.

Originally Posted by bluegtp91

Stock coils have more power output than MSD's. Proven. You want your car to run better? Get Autolite 606 spark plugs and get better WIRES, like MSD's or PRJ's. Stock coils are used on most of the fastest WBodys around...why? Because they are proven to not fail...just go grab a new set from Autozone OR... Morad Parts Company - 3800 Motors, Transaxles, & Stock Parts

source: http://www.grandprixforums.net/msd-c...ice-40299.html

Originally Posted by Classy Pontiac

Hey victor, i was looking at your cardomain site of the Prix and noticed you had a custom tune. Did you get a custom dyno tune or did you get a canned tune?

I started with the canned tune from ZZP that comes with the turbo kits. That got me to 115 traps and 15psi with no knock. Afterwords a friend of mine worked on the tune to straighten a few things out, like leaning the car out some for more power.

im not so sure i understand why this thread is based around a certain level of boost. if you run a turbo, you should have a boost controller. therefore you run whatever you can before it knocks, unless im just completely retarded and you base a motor build around running a certain boost level (which would be stupid as hell).

Bio, i will have a boost controller but right now the wastegate i have has a minimum psi of 9 psi because the spring in the wastegate is a 9 pound spring. I just wanted to know if a stock l26 could even handle 9 psi.

Thanks victor for the reply. Thats all i needed to know about the tuning part.

I've ran 30+psi on an n/a block

Originally Posted by kuntzie

I've ran 30+psi on an n/a block

L36 maybe...but L26's poop their rods out like clockwork on higher HP builds.

Fuel (octane), tune and the temperature of the air coming through the throttle body play the largest part.

Thanks for all the help, it was greatly appreciated.