Whos got a TBI 383? What kinda car you running it in with what kinda gears? What gas mileage?

 

I plan on running it in my gmc suburban, I really need alot of torque. My gears are 3.73 ratio... Gas mileage, from what Ive gather from others is amazing, with more power than a 350. Ive even seen a guy who said his mpg stayed the same.

I doubt Ill get 21.2mpg in my 2wd Burb that I averaged on hwy often! But who knows, it should still remain high!

 

Nobody.

383 TBI's on 3rd Gen are a thing of fiction. If you want to find guys with 383 TBI's go to Full Size Chevy Forums.

http://www.fullsizechevy.com/forums/

 

Sounds like people are having alot of trouble tuning these. I suppose its because the tables are so far from stock they have to re-write everything.

 

I wouldn't say "alot of trouble" but it is challenging. 383, Dart heads, headers, bored TB, Edelbrock intake, all these mods would be challenging to tune on a 305 or 350 as well.

 

I was going to build a 383 stroker for my truck but ran out of money so I stuck with a cammed 350. I'm actually glad that it worked out that way for now because my 350, with a cam and headers (everything else is stock) is still difficult to tune. I'm just starting out, and I don't know if I'd ever have gotten a 383 with aftermarket heads to run well enough.

With the experience I have now, I have no doubts I could make it run. It's a big step and if you can practice on a milder engine that isn't radically different from stock then that's the best.

John

 

maybe some day ill tinker with this idea and all..i could have built one but i didnt know anything about tuning which i still dont but i mean i knew id have to, and a lot of extra money that i didnt really have at the time..im happy with my 350 engine