Cascade Crew

LB985IROC · Posted: Fri Oct 26, 2007 7:07 pm Post subject: tbi cars

so i dont know exactly how many of us have tbi cars and im curious to know more baou them liek has anyone put a chip in theires anbd seen results? are they better in more ways then just more reliable then tpi?? wehat kinda numbers are you seeing the only things im really familiar wiht are TPIs and LT1s

Dewey316 · Posted: Fri Oct 26, 2007 7:22 pm Post subject:

I've done a lot to mine.

Here is my entry in the garage.

http://www.cascadecrew.org/phpBB2/garage.php?mode=view_vehicle&CID=4

LB985IROC · Posted: Fri Oct 26, 2007 7:36 pm Post subject:

yea i knew you had alot dopne to yours but didnt ever look at your garage thats nice

Al Hasse · Posted: Fri Oct 26, 2007 7:40 pm Post subject:

Taking care of an exhaust leak on mine tomorrow, then I want to chip it. Maybe get that taken care of by the Jan dyno.

91RSVert · Posted: Fri Oct 26, 2007 8:51 pm Post subject:

Just pulled mine off. Had it for about 6 months. Have worked on 4 s10's with TBI, so I know about them.

LB985IROC · Posted: Fri Nov 02, 2007 9:43 pm Post subject:

yea all my f-bodys were either LT1 or TPI 350 tbi is a little new hey i was wondering do you have to use a intake manifold specified for a TBI or can you use a carb one??

Dewey316 · Posted: Fri Nov 02, 2007 10:09 pm Post subject:

Your best bet is to get a carb sible plane, and an adatper. Ther hardest part will be fitting it under the hood. I use a Weiand 7525 manifold that is a low-rise single plane with EGR, I don't know that they are made any more though. If you can find a low-rise single plane, you can make it work.

if you don't go that route, Holley and Edelbrock both make TBI manifolds, but your best performance is going to be a single plane manifold and adaptor.

-John

LB985IROC · Posted: Sat Nov 03, 2007 3:58 pm Post subject:

i see i see.. also is there any hinderances with cams i just found the cam i had in my blazer and it was beastly all i know though is it is an rv cam i have no idea the profiles or how to figure out what it is

Xophertony · Posted: Sat Nov 03, 2007 5:13 pm Post subject:

rodney (RJMcGee) once said "it's called an 'RV cam' because thats about all you can pass once you install one"

that said i have never run one, and i'll bet anything is better then the 305TBI penut cam

Quasi-Traction · Posted: Sat Nov 03, 2007 6:49 pm Post subject:

Check out dewey316's cam.

Older Ultradine roller cut. I think Lunati sells something close to it now.

Tony, you probably have something close to the equvilent of a RV cam in your L98. The TPI (peanut) cams make tons of power from idle-3000rpm, just like the old RV cams did in the Flat tappet blocks.

LB985IROC...Your cam is probably something slightly better than the LG4 cut on these cars.

I'd be around a 207 or 209 AD, and a 224 .050 duration on a High .300 lift.

rjmcgee · The Hammer Joined: 08 Jan 2004 Posts: 2328

Dewey316 · Posted: Sat Nov 03, 2007 7:55 pm Post subject:

IF i was to redo my engine over again, and I knew the bottom end was in descent shape. I would go with a bigger cam. Note: YOU WILL NEED TO DO TUNING, but the tuning for my cam was not bad at all, and going with a bigger cam to get another 1000 rpm out of the eninge, will gain you lot. I didn't really lose any torque, and I picked up alot of HP. I think someting in the 212*-218* intake range would work well. If you are sticking with the stock head though, the cam I used is about the limit, I would possibly go for a cam in the 208-212 range, and that should work well with the stock heads flow limits.

--John

STEEL · Posted: Sun Nov 04, 2007 10:16 am Post subject:

Ok, so in respect to my daily driver, the 91 with a TBI 305, what kind of cam could I put in there that would give me an increase in performance with out sacrificing fuel economy? Would it even be a good idea to cam a 305 with 180k miles on it?

LB985IROC · Posted: Sun Nov 04, 2007 8:04 pm Post subject:

yea idk the rv cam was a mild thought and i did not take in to consideration its a roller motor its just the old one out of my blazer man i really think i need ot get a possi before i do anyhting that thing cant get traction to save its life and its only a LO3 lol

Sellmanb · Member Joined: 30 Nov 2004 Posts: 727 Location: Tigard, OR

Dewey316 · Posted: Mon Nov 05, 2007 9:48 am Post subject:

Steel,

Didn't we talk about this at cows? Yes, I stabbed my cam in at 180k miles, it has done great, I knocked down 32mpg on my trip to KFalls.

BUT, honestly, beyond headers, don't modify you L03, UNLESS you are willing to learn and spend the time doing the computer tuning. That is the thing you have to be willing to do with EFI cars, if you don't want to mess with the computer, don't mess with the engine.

--John

91RSVert · Posted: Mon Nov 05, 2007 10:45 am Post subject:

STEEL · Posted: Mon Nov 05, 2007 1:24 pm Post subject:

Now that you mention it, i remember that..... So, what would it take for me to do some tune work on my 91? It seems to be becoming less fuel efficient and the power just drops off at 3700 rpm. I dont know if its cam, or injectors, or what....

Dewey316 · Posted: Mon Nov 05, 2007 1:26 pm Post subject:

not changing the cam, won't cause you to lose power. I suspect there is something else happening. Have you done all the tune-up stuff? Plugs/wires/cap/rotor/fuel filter/air filter?

--John

STEEL · Posted: Mon Nov 05, 2007 1:31 pm Post subject:

Nope!

Ya, hadn't even thought of that yet. Im still wanting to do some MSD on that car, but I havnt gotten the money together for it yet...

Are the super fancy spark plugs really worth the extra money?