everywhere says use the "NA" BSFC for us, which is .45-.50. SO since we are an NA engine BUT with a turbo kit, is it still considered "NA" for BSFC purposes or do we move the BSFC numbers up to the "turbo Engine" range for injector calculations?

USED TO HAVE...Everything you wish you had, and then some...

You are somebody special Tim, you matter! - from the admins (but nobody likes you, because your username is just like that other guy's, and you whine a lot)

After the rebuild, I would use higher numbers than stock. You lose some efficiency when you lower compression. So, it will take a little more fuel to make the same power. If it were me, I'd probably use 0.58 or something. But, thats just a guess as I have never put a 420A on a engine dyno for testing. The calcs are just a jumping off point for tuning new setups.

Corbin

'95 ESI-T
HRC+FMIC+ETC...



Gimme fuel...Gimme fire...Gimme that which I desire

thank you!

USED TO HAVE...Everything you wish you had, and then some...

You are somebody special Tim, you matter! - from the admins (but nobody likes you, because your username is just like that other guy's, and you whine a lot)

Yeah without Engine AND drivetrain dynoing to get specific loss and output numbers, BSFC is pretty much a guessing game. Its very existence in my fuel computations pisses me off, personally. But I'm a tuning noob.

I just did all my computations 10x, one for each value of BSFC from .50 to .60 and tried to match it up with my real-world numbers. Obviously BSFC will vary a bit between engines because of tolerances and ring gapping and stuff.

Hehe... don't get caught up in fuel pressure calculations and engine consumption data. I spent a week trying to figure out some numbers and nothing seemed to match up. Based on my calculations, I needed xx psi of fuel pressure at x lbs of boost. Let's just say those calculations left me pretty lean. I don't believe in calculations anymore.

1996 Eclipse RS / 5-Speed / Aerogear Body / Coated in Magnetic Red Metallic rev.2 / T3 Turbo Intercooled @ 8 psi / More at http://home.insightbb.com/~mgalyan/
Mark Galyan - Indianapolis, Indiana

im really starting to figure that out!

USED TO HAVE...Everything you wish you had, and then some...

You are somebody special Tim, you matter! - from the admins (but nobody likes you, because your username is just like that other guy's, and you whine a lot)