Hi guys, what do you feel is the best thing to do to get my quarter mile et down? I run a 350 chevelle with a Richmond 4 speed. Rear gears are 3.08 and 1st gear on tranny is 2.64. I run drag radials and they hook great, no slip at all. My motor is a Summit crate motor that is about 4 years old and I believe was rated at 360hp back when they made that setup. I have boxed my rear lower control arms and that eliminated my wheel hop. As I said I have no problem hooking up at all with the drag radials on. Should I look at new rearend gears? suspension parts? Carb? I am looking to do all I can without going into the motor as it seems to be fine, does not miss at all even up to 6000rpm. I try to shift at 5300 though.I am running 14.30s and would like to get into mid 13s. Can I do it without internal motor work? Also will grinding out my intake manifold ports help? That was suggested by a person I know.

Nitrous Oxide. Best bang for the buck.

With a 125hp system you should be able to knock a full second off your ET. graemlins/hurray.gif graemlins/hurray.gif

nitrous is definately the best bang for your buck, but i think some 3.73 gears will get you into the 13's with no problem. what do you have for exhaust? what kind of intake? what camshaft? what carb?

What's your 60 ft. ?
Higher shift point should help too.What is your MPH and rpm's at the stripe?
I think swapping to some steeper gears would certainly help,especially with a stick.
3.73-3.90 IMHO
What are the details of your current combo?

..and 14.30's with a 350/4 speed and 3.08's is pretty respectable in my book graemlins/thumbsup.gif

thats not too bad at all

Read this http://www.chevelles.com/forum/ultimatebb.php/topic/4/23545.html

I'd worry about tuning what you have for now. Cause if you have a true 360HP, heck even 300HP, you should be able to run 13s. What are the specs on the crate motor now and what do you MPH at?

Have you weighed the car?

Mine weighs over 3800. Doesn't help things.

O.K. here are the specs. My intake is an edlebrock performer with an edlebrock 650 carb. The exhaust is flowtech terminator headers through Magnaflow mufflers with 2&1/2 inch exhaust. The cam I am not sure of as the car was bought from a dealer with little info on the interiors of the motor. My 60ft. times ar in the mid 2.20s. MPH at the stripe is 98 and rpms are about 5000 in 3rd gear. I do not quite get to 4th gear usually. My motor specs are unknown . I called Summit and they said they used to put out a 360HP motor but that was a few years ago so they could not help much. They did say it probably has either 9.2 or 9.5 to one pistons, it has been bored .30 and the crank is turned .10 other than that I do not know.

Thanks for the help guys.

My car, while not a stick shift, has run 13.50's at 98mph, so you have plenty of power to go 13's. If your 60' is only 2.20, I'm pretty sure you are spinning, you just can't feel it. My 60' was 1.91 on my best run of 13.54.

Id say start out with a gear thats better matched to your engine combo. A good guess is 3.73, but I cant tell you for sure cause we dont know the specs, but that should be close. At the same time, you want good tires and possibly a little more dialing of the suspension to get it to hook, but Id start there and see where it gets you. A set of frame ties will stiffen the car up and keep the launch straighter(and keep more even weight on both tires), plus they'll keep your car from twising in the future.

Change that gear in the rear to at least a 3.73 or better, Plus your tire size should be around 28 tall for your car...mike

Please watch the rearend gear you pick, b/c you MAY not like your highway speed/rpms afterwards???

Personally, I love my 3.31's in my 12 bolt and wouldn't go higher the 3.55's, but I have a First Gen. car.

pdq67

How do you launch the car? A 2.2 60 ft makes it sound like you maybe lauching the car soft, or it is bogging. The rule of thumb is .07 seconds for every .05 cut off the 60'. So a 2.0 60 ft would get you close to 13s. I would first play with the launch then work on the rest of the car. You might call summits tech line as they should know more about your engine. Its been a while, but I think they installed the crane energizer 272 cam in that motor, and the heads were nothin special by todays standards. But I think the motor can get you to your goal without any major changes.

I launch at about 5000rpm. Does bog a little off the line though. I just figured it was do to the tall 3.08s. The heads are trickflow heads.

Car weighs 3600 with me in it.

Try launching at a lower rpm. Although the 3.08 gears arent helping matter as far as engine bogging goes, its very possible that you are just about out of your accelerator pump shot launching that high. A lower launch rpm will take less gas pedal obviously to maintain an rpm, and there will be more pump shot left when you really need it, if you are in the pedal less for a lower launch rpm. That alone should partially eliminate the bog(maybe not totally, but it should help). Plus, although we dont know the cam specs, from the way you say it runs as far as its powerband goes, its torque peak should probably be below 5000rpm. So you could launch at a lower engine rpm, save some of the pump shot for when you need it, and still possibly be at or very near the torque peak(which should occur lower than your current launch rpm). Another option that I would do is to try different pump cam settings or a different accelerator pump all together(larger pump). Either way, If you keep the launch rpm that high, you most likely can benefit with some adjustments to the pump shot/cam cause it probably is just about spent due to the amount of gas pedal you have to put in to reach that 5000rpm launch.

In the end, you still should change some of the bigger stuff(definitely gears and try better tires out just in case), but a little carb tuning, and/or a different launch technique may go a long way in your case as far as 60 foot times go.

If you are bogging with a 5000 rpm launch, you have some carb tuning to do.