my 1989 firebird ran a best of 15.5 with open element, headers, catback, gutted cat, stock 700r4 and stock 2.73s open rear. now today i tested my posi, 3.08 gears, relocation brackets, larger rear sway bar. my car now ran a best of 14.4. TRACTION FTW!

 

sweet yea traction was deff a issue what was your 60'

 

Wow, L03 I'm assuming? Those are good numbers. Incredible improvement with the mods you did! Have you touched the chip? I bet your just a chip tune and maybe a 3.42 gear away from 13s.

 

actually im a push of a button from 13's. and sorry i messed up it was actually a 14.4. i forgot the 60' i check it today and get back on that. but i just put the 3.08 gears so i kinda dont want to change them anymore. and no i havent touched my chip at all.

 

Do you have a cam in that yet? What track are you racing at? Congrats, those are some great times

 

stock cam and lebanon. but i just checked the slip and its actually a 14.3 sorry i messed up twice i dont know why the other number where in my head. and that was with a 2.6 60 ft. i was footbraking my car i was just playing with it after my mods and thats what i got next time ill footbrake.

 

I'm having a hard time believing this. Picking up 1.2 sec with relocation brackets, larger rear sway bar and 3.08 w/posi with a 2.6 60ft. I don't think so.
I'm not trying to be mean, thats just a huge pick up. You probably had a better 60ft with the stock 2.75 rear than a 2.6. I know I did.

Steve

 

Only a 2.6s 60', no offense, but that is slow. My fullsize van with the stock 190 HP 305 converted to TBI would pull down a 2.48s 60' with 3.08 gears.

 

that seems odd..my 350 tbi only ran a 14.78, 3.08 gears and i had a 2.1 60'..


with a 2.6 60ft...and a 14.5 timeslip if your burning those tires up, that means your lo3 is making HP enough to actually run a mid 13 with that 60 time...i doubt that it is making that much hp...what was ur MPH on this run?

 

I ran 15.3 with a 2.0 60'......That is with a 3.23 gear....You made a really good drop, but your 60' time is slow for a 14 second run...Something does'nt seem right...I cant wait to get the headers on then, if they make that much difference...Tom
BTW, what was your MPH????????????

 

i hope he answers one of us...i cant wait to see

 

i dont like to say it could not be done however,my current 96 z28 has been dynod at 284 rwhp and i run 13:90-14:20 @98-101 mph w/2.0-2.1 60's here in vegas, there is no way in hell an Lo3 can do this with the mods listed without n2o....must be some kind of mistake.when i put my c6 wheels on i launched my car at 1800 blew the tires away 3.04 60' spun through 1st and part of 2nd ran a 15.32 @101 this still shows the HP is in the car but i killed the 60'.....sorry bro i have messed with 3rd gens since 88 and i know what it takes to get them to fly and your mod list is not near enough,if you swapped out to an lo5 it would make a lil more sense but still 3.08 gears neither motors make enough tq to get the car to launch hard to ET that nor the HP to MPH i mean to recover from a 60' like that you would need 300-345 rwhp
please understand i am not attempting to discredit you in any way,i as well as the others that have posted are curious

 

On all 3 of my runs, I had none to very little tire spin (255-45-17) The MPH is about right for the power level im producing...Im amazed someone elses car which is very similar to mine ran so much better....

 

I barely ran a 14.9 with a 2.1 60 ft. That's a head scratcher?

 

Post up the timeslip, something's really not adding up here. I ran a 14.8@92-93 with a 2.0X 60'. Running a 14.3 with a 2.6 60' is more than enough power to run in the 13's. Post up more info on the car, have you gutted it? What's the raceweight? Are you sure it's a stock 305 in there or did the previous owner stick in a 350?

 

thinkin this thread is dead

 

yeah, the guy dont wanan admit that thier is something wrong

 

o sorry i havent been on here in while and i forgot to check this too. but yea i forgot to add i do run nitrous. 75 shot

 

dude i seen you online the other day under ur name it says when ur online..ok a 75 shot cool..all question answered....????....whats was the mph?

 

you forgot to add that you used nitrous? good grief

 

well that explains alot:
you sprayed out the hole and spun baaaad(radial 15's)
launched then sprayed and blew the tires away(radial 15's)
i am glad you came back to clarify your post
N2O is the factor

 

Time to put in the big jets

 

so what did u run w/o nitrous? im goin to put a125 shot on my 350 i havve forged pistons already. I guess i might be turning high 13's...supersweet

 

UnderCover89TBI
have you run your tbi 350 as of yet?
if so what was your ET & mph?

 

I don't believe him a bit. One of his first statements was this "actually im a push of a button from 13's."

Now I am not a expert and could be wrong and while my car has never been on a track I feel it's safe to say it is a true low to mid 14 second car. This is based on racing my friend who has a 1990 corvette and while my car doesnt beat it certainly doesnt lose by much.

His vette is "bone stock" with a 6 speed

My car 1990 L-98 with LO-3 induction, 5 speed, 3:73 gears, TPI exhaust system .... however it is run with a suburban 350 chip (probably its downfall)

My friend seems to always have me by at least 1 to 1 1/2 car lengths ... His car runs very good.. His car gets me out of the hole and just maintains it. But like I said I am basing low14's to mid14's based on what the corvettes did in their day. So by this I would say my car should run respectable mid 14's I have everything a TPI 350 f-body has except the actual TPI system. But I do have 3:73 and a 5 speed

So if my car has to work HARD getting to mid 14's the original posters car couldn't possibly get there. Not with a 305 and freeway gears. His mod's would NOT get him there. And he himself said a push of a button away from the 13's to me that implies he ran 14.4 N/A and 13's would be made on the juice. Sorry but I have driven a 305 tbi car with freeway gears and mine will leave it sitting ....... Sorry just my opinion open air cleaner, headers, 3:08 gears 15.5 seconds maybe

 

best so far has been a 14.78 and 92.9 mph with a 2.1 60 ft. time
3.08 gears, sloppy auto transmission..2-3 shift is horrible.
i have headers, cam, stock heads, 9.0 comp., 2 3/4 single exhaust, running a computer and chip from 93 tbi caprice 350..

 

Undercover89tbi

What was involved in the 93 ecm swap? And what knock sensor, EST module & injectors did you use? ........ Do you use the stock manifold? what kind of cam? ..... Is your 350 an EX L-98 or do you have an LO-5. I'm asking cause you mention stock heads.

Mine is a hybrid 1990 vette shortblock with 89 f-body 083 heads. So not sure what the compression is. with aluminum heads the 90 vette had I believe 10.25 to 1 so with 64cc heads I believe it to be probably be 9.0-9.5

I am basically breathing through a dual snorkel air cleaner with functional 84 carbed trans am cowl induction stuff. Stock LO-3 TBI and manifold. I think with a edelbrock TBI manifold and ultimate TBI mod's & my 3 inch edelbrock TES headers I think low 14's would be easy.

 

I made a mistake my 60' times were in the 2.15 range.........

 

to answer your questions in order, i put the ecm plugged it in that's it. car ran better.
I used a 350 esc module from p/u truck and knock sensor from p/u truck bought them used for 91. got a 350 tb and used that. i have edelbrock tbi manifold, crane emissions legal camshaft part #114122 all in a 90-91 chevy 350 block non roller cam with truck heads, 74cc i think i have trw forged pistons for 9.0:1, using stock air cleaner housing with truck filter and lid, all emissions legal except for missing cat, timing is at 8 degrees. My transmission is my weak link. motor runs pretty smoothe for not being tuned properly...any more questions let me know.

 

thats what i do i change my jets depending on my mood

 

i was curious about your times cause i a am putting my s10 back together it is a stripper truck,350 from a 94 1500 p/u,700r4,2600 stall,lt4 cam,modded tbi,headers,true duals,3.42s and gettin ready to swap intake manifolds to a 4bbl w/tbi adapter this s10 weighs in at 2760 w/o me in it. i figure 13.5@104

 

that sounds doable as long as your getting traction what size tires are you going to run?

 

drag radials and et streets.....
since i just got a new6.0 engine for my 95z i may just put the extra Lt1 in the truck after a nice freshen up
----------
my old blazer ran 14.50 with the same set up on 225/50/16 radials,3536lbs,2.0-1.96 60'

 

I run 14.8's off the bottle and 13.8's with a 52 jet (I think?). He already said he ran that 14.3 or whatever it was on a 75 shot, upping the jets to a 125+ shot and getting traction is easy 13's.

 

so i should run 13.8 with a 125 shot

 

What do you run now?
What are your mods now?
What 60' times do you cut/what kind of tires do you have/shock/spring setup and are you spinning bad now?
What track do you run at?
When you say 125 shot are you talking NOS 125 shot or NX 125 shot?
What elevation are you at?
How will you be tuning on the bottle?
Which gear are you going to spray in? Window switch?

There's a lot more to it than will I run X with Y. I should be running faster than I am but there are a lot of things that slow a car down, sloppy shifting (T-5's aren't big fans of nitrous), bad bottle pressure, poor launches, incorrect fuel/nitrous jetting. I can't spray on the street because the tires will just go up in smoke in 1st and low 2nd gear. Fortunately the drag radials do a good job catching the track but because my clutch slips I can't really launch the car (2.0X 60' times). With NOS's recommendation for a "125 shot", I picked up ~85 rwhp , whereas I've seen cars pick up 125 rwhp on a "125 shot" on an NX kit on the dyno. One of the best purchases you can make is a bottle blanket/heater to keep bottle pressure consistent, when I start losing pressure it'll start surging a bit and basically shoot fuel out the tail pipe. It's a simple system, but I'd recommend making sure the rest of your setup is without issues before running it.