Figured id join in on the TBI accomplishments.

I sent a 92 RS with a bone stock L31 and a holly 670 TBI from a 14.1@90 to a consistent 13.6@98 on a first run basic tune i worked on last weekend. Theres plenty more to be gotten from it. I copied over the Vortec Timing Table and it alone made a drastic difference in its unmodified form. I still havent even changed the VE tables from he stock LO3 program.

"TBI" is moving on up Although i still love me TPI.

 

Very nice results for a TBI I almost bought a 91 but I was told TBI was terrible....but with that number nice!
What mods do you have done any nitrous?


Jay

 

8 mph from tuning.....thats 80 HP ladies and gentelman.

If thats not a poster child for tuning I don't know what is.

Good job!

 

Thanks guys.

The mods are as follows:

97' Tahoe L31 Stock from block to valve covers
RPM Airgap intake
Holley 670 TBI
@15-17psi AFPR
Flowtech Cheapo Headers
Cutout
2200-2500 stall
stock suspension with homemade boxed LCA's
air shocks

This car is plain raw off the line pulling 1.7 60'.

When you get results like that, you never want to stop.

 

Thats funny, thats about the same combo I'm running only I had a 218/226 dur. cam and stock heads, ok it's not the same, but you get the idea of how much more cam you have to run in order to make the same power as vortecs do. I ran a 13.8 at 97.5 I imagine you would break into the 12's with a cam swap.

 

I thinking about a cam and some new RR's. The flow is there in the heads, its just getting it out of em'. Hence going for a cam.

 

1.7's with 2.73's and street tires?

 

something's not right there

 

I think he means 2.7............or..........

 

I think some folks are speaking too soon. I do not see anywhere where 91GTABird claimed he is using street tires and 2.73's. . .

(hint: ignore his side bar: it is a '91 GTA with an LB9. His post speaks of an '92 RS {which is a CAMARO!} and an L31.)

RBob.

 

just to clear it up a bit hes talking about my car we wored on the tune last weekend and I ran it the weekend and it ran 13.61@99 you can read my sig. for mods but yes it was on street tires but 3.73 gears.

 

Any power numbers yet? Also, what kind of cam specs do you have?

 

1.7 60 foots on street tires is STILL something else. thats near unheard of. what size tires you on and the brand name of them?

and running 14.1 at 90mph is also VERY impressive. actually crazy impressive. 14.1 is DAMN good ET for that mph. i thought it was nearly impossible to hit near 13's with mph less than around 93-94.

just impressive what you have done so far man.

 

1.7 60 foots on street tires are not un-obtainable. Hell, I am cutting 2.04-2.07 60 foots with my 5,500# van. I cut a 2.18 with a 305 in it.

The low-mid range power of a properly tuned 350 TBI can be impressive.

 

Nice work

RBob.

 

No I dont have any dyno #'s yet and as far as the tires I have 275-50-15 bfg's but they only hook up good at the track and the cam am running is the stock l31 vortec cam I think its like 410-427 lift or close to it.

 

Sure, not unheard of, just very extremely rarely heard of without something very substantial up front, and some suspension work. (Read: PHB w/ solid or stiff mounts.) Given that he hasn't adjusted his VE tables, I wouldn't say it was "properly tuned." Of all people Fast, I highly doubt you would suggest that the VE tables of a LO3 and a L31 can be THAT similar - so much that they could be interchanged. Either way, that had to be one well prepared track, and some sticky *** street tires to cut a 1.7 sec 60 footer with a first try tuned L31, and homemade boxed LCA's.

If he says he cut it, fine, he cut it, (I wasn't there, I'm not going to call him a liar) but I did have to read it several times just to be sure I was reading what I thought I was. That's just one heck of an impressive 60 foot for what he's got going on... hence the ....

 

Jeez, and I just got my AFR 180's in for my 350 that I'm building. Now I'm happy I've got TBI

 

Well, that's some good stuff. I know what to look forward to with my set-up, without the nitrous. hehe.

 

Well my 60' are so good because the track was well preped and you gotta think the stock l31 made 330ft lbs @ 2800 rpm and my stall is just under that so after my mods it has to be more that 330 it has a ton of low end power and pulls great to 5500.

 

Well... that it did....

....with a completely different intake, and a proper factory tuned ECM, or at least one of meeting the ODB2 standards. Right now you are running a different intake which can/will considerably affect the powerband, and likely to be incorrect VE calcs. What I'm saying there is don't count 330ft/lbs and go up from there, because you don't know for sure you are still making the base line 330; it could be more or less.

That being said, I think you have by far the best idea for a cost effective motor swap out there. I have been toying around with the idea of building a 350 vortec TBI car, but DUH! why not just get a vortec 350 motor complete instead of parting one together. I also think it will make a great little engine, once you get the tuning all 100% ironed out. Well, okay, who am I kidding... nobody is EVER just "Satisfied" with their tune, they've always got to be playing with something, but still.... great idea for a motor swap.

 

That is pretty much the engine I have, the vortec 330/350 motor. but is had 9.75:1 compression and a bigger Comp XFI cam. I I can get the converter ironed out I'll be at the track VERY SOON. To post some times. If you get the VE table straitened out and get down to the track again, please post the times. This is a good thread for those who said TBI isn't any good.

 

Not to nitpick....but Godoveryou (nice name by the way ), a panhard bar does nothing for strait line traction.

 

For all you poeple screaming about VE tables you must be the people that commit 100 changes in 1 tune before even datalogging.

This first tune was nothing more than to situate some driveability problems and get a baseline for the timing. IM not just gonna throw some over sized numbers in the VE tables right off the bat just on a hunch. I do datalog for a reason.

"First run , basic tune" I can not stress that anymore. And who are you tell me somethings not "properly tuned". It seems to me that i was the one that made the post of dropping a 1/2 second off an e.t. from a "BASIC" tune.

Lets just not get an infamous TGO pissing contest started again.

And thanks Rbob on the clear-up with the rear gear.

 

Yep...........no pissing needed. Just good info and results

Congrats on the progress. It's great to hear positive results. And to the 60' times it's been done before....

ben73..... My 383 TBI (Crossfire) ran a best of 12.81 @ 107mph last year. 60' was 1.76sec on normal street tires

This was not his best time but it goes to show what can be done on the same tires that I run......Falken 255-50-16's

 

Bmonte - Uh yes it does. When the rear loads during launching or shifting, the PHB can and will flex, causing the whole rear track to move sideways, braking traction.

91GTABird - I am the guy who's making the logical assumption that an L03 and a L31 do not have the same efficiencies at every RPM. There's no pissing, but are you the guy to say that they are just as efficient everywhere in the powerband?

 

God, no it doesn't. There is no side force generated when launching a car, deffinately not enough to flex a pan hard bar. When a car kicks side ways it's because one tire looses traction before the other, usually the right side. We can discuss it furthur in PM's or in the suspension forum if you'd like.

 

No. I know that they are probally far off. You just jumped the gun. I know what you are saying though.

We havent gotten a change to adjust the VE tables. I would be interested though to see what a stock L31 VE table looked like though for a little reference. Plus after that i can add on the factor of the Air Gap, Ult. TBI Mods, Ram Air (Def. up top), and full on exhaust.

What would your suggestions be Godover? Do you have acces to a L31 or the like VE table?