Hello all, last night I went to the track and finally laid down some good numbers.

REACTION- .7184
60FT- 2.1834
330FT- 6.1399
1/8ET- 9.4799
1/8MPH- 73.68
1/4ET- 14.7235
1/4MPH- 96.11

This just with an ultimate TBI and caprice chip (I have a 350). I think that TBI has much more potential than people give it credit for. Soon I will be putting on AFR 190's an LT4 hotcam and the holley 670 and I'll see if all that runs...but right now I'm very happy with TBI.

 

Nice times! Get that 60' down and with a 96-97 mph trap you'll be right at 14.0 or high 13s.

 

Well I don't think I'll be able to cut down my 60' without getting some better lower control arms and maybe wider tires...235's aren't cutting it. Does anyone know the widest tire you can fit on the 16" stock Z28 rim?

 

Want me to add you to the registry? See link below

 

wow thats pretty darn good considering you still have that TINY tbi unit on there.

Get the bigger TBI but dont change anything else (provided the manifold or adapter is set up for the bigger tbi unit) and run it again i bet youll gain lots of trap speed. You are feeding an l98 with like 300 or so cfm. Call me crazy but id stick with the same injector pod and just up the FP till you are running your best times. I tend to notice that people swap TBs and dont improve or run slower. I attribute that to the overly rich condition that the injectors they install along with the TBI cause. A rich motor will make you run dog slow.

 

i just got back from today and here are my numbers:

r/t - 1.337
60' - 2.284
330 - 6.626
1/8 - 10.230
MPH - 68.23
1000 - 13.334
1/4 - 15.969
MPH - 84.92

Those are on a 305 tbi 1988 trans am with and open element air filter and a flowmaster muffler. are these good?

 

Those are some good times. Auto or 5 speed?

 

what the hel....i have a 305 tbi 5spd and my times were horrible the other day.. i left the slips out in the car but i do remember i had a .6 reaction time 84 mph and my time was 16.2.... am i doin somthin wrong??

 

Those are good times (first guy)!
You should mosy on down to the TPI boards and waggle that in thier faces (so snooty when it comes to you TBI guys they are).
I for one have always looked at 305TBI times and knew that a 350 TBI would snap at the heels of a 350 TPI once the TBI was improved, which you have done.

 

Reaction time has nothing to do with your times. What was your 60 foot?

 

Well I thought these were pretty decent. Would I see a decent gain with a weiand stealth and holley 670. If so I may go and save my money for that. My car is pulling pretty strong to about 5k now, but I know the motor is save to about 6k, so I have some room to go. Hopefully that along with some 1.6 roller rockers will give me enough air and cam to pull to 6. Thanks for the compliments though, I wouldn't have gotten this far without the help of this board.

 

Oh, and you can add me to the registry...is their a limit to what qualifies, like do you have to have just the two barrel TBI, and are power adders allowed? I don't think I'll run 4 barrel for a long while, but was just curious

 

you will definately make gains with a throttle body and manifold change if done right. Id go with a weiand single plane like a 7525 but if you must use a dual plane go with a performer RPM.

You are going to have to start tuning the chip.. You might get away with things if you just swap over the gm injector pod to the holley TBI and actually improve your times with FP adjustments.

If you go wit hthe holley injectors forget about it they are huge youll need chip tuning

 

You can get the holley 670 with different size injectors. The one for the 305 is 57 lb i think. Not too big in my opinion.

 

not too big with chip tuning

it will be very rich otherwise

 

cr125r, thats just about what I went with an open element, catback, and free mods. 15.812 @ 83.84 with an A4 car.

 

auto

 

thought i would add my times, since then i have added a 1/2" TBI spacer and ran some 3" air duct hoses from behind the brights to the open element to try to get alittle more cold air to the TBI (brights removed). I actually went to the track yesterday and couldnt hook for nothin, my best time was a 15.4 with a 2.302 60' and a 100MPH head wind (okay, but it was windy as hell). My goal with these mods are a 90+ trap and a 15.1x ET.

RT - .582
60' - 2.182
330 - 6.277
1/8 - 9.742
MPH - 70.65
1000 - 12.747
1/4 - 15.294
MPH - 88.44

 

i dont think he wants to do that.....

i agree (again) with Pablo on this (yeah everythign he said in this thread.......)

 

if you could go back and do it again, what oreder would you have done the mods(as in, which ones were the best)

 

i did: (by the way this is vjo90rs8)

open element and ignition
headers, cat, and catback
ultimate TBI mods, crank pulley, chip, suspension mods
gears and posi

if i went back and did it again, i would have done it the same exact way, the gears made the biggest difference, but i dont think i would have seen at same difference without first making sure my car was tuned up and doing the full exhaust. I would recommend that you do the mods in the same order.