I have a modified 87' 305 TPI motor in my 92' camaro. Last time i took it to the track i hit a 14.4 at 94mph. This was done with street tires which was dropped to 21psi,leaking coil, 2 bad plug wires and with 3.23 gears.


As of now i have a brand new Coil, New wires and Nitto 555 Drag Radials. I also installed 3.42 rear gears(im running a t-5 tranny). Im hoping to hit high 13's. I plan on taking it to the track soon, so anyone wanna post any guesses on what i might do at the 1/4 mile? guess it could be fun.

i think i'll hit 13.9 at 101mph.

 

Sounds like you answered your own question

BamaZ28

Good luck

 

I think 13.9 n/a with your description is totally reasonable.

 

Id like guesses from others, see who's closest.

 

Was your car misfiring down the track last time? I doubt you'll see 7MPH from tires and a MINOR gearing upgrade.

 

Yeah the car was missing really bad, reason i think i'll gain 7mph is the fact when it missfired i left off the throttle, forgot to mention that.

 

I guess it would depend on how good the car hooked on the street tires on your 14.4 run and how well the track will be compared to that run.

Rule of thumb with those Nitto Drags: HEAT THE **** OUT OF THEM As far as pressure goes, you'l have to do some testing but I would start at 25 PSI and keep going lower until it hooks best. Drive around the waterbox also if you can.

I would also do some minor stuff that is really cheap. I would take the intake plenum off and port the inside(grind down the little walls behind the throttle body openings making them as smooth and free flowing as possible), then I would remove the air filters which I'm assuming are stock. If you want, run without them or put something else there that filters more freely like a set of K&N Filters.

Last but not least, Let the car cool down as much as possible. Possible wire your cooling fans to a manual switch and keep them on in the staging lanes. That along with a 160 degree thermostat helps like crazy. A bag of ice on top of the plenum and throttle body works nice also.

Goodluck! That's a 13 second car in the making!

 

yup 13.9s on a N/A 305 is very reasonable, i hit 13.9 @ 97.08 on street radials and 3.08 gears! ice the plenum up and do all the "free mods" the 5spd cars are quick!

 

I got a 14.1 @99mph with a 2.3 60' time.
I started out with an LG4 305 5 speed and put a TPI setup, cam, cold air, and other small things on the car.
Now it's being converted to LT4.
Picture of my TPI setup

 

Like said above, you really need about 97 mph to hit 13.9 with a good hook, and with those 555r's you should be able to

 

yup that 13.9 run was with a 2.02 60 foot