I wanna break into the 15's soon, the thing is i have to keep the 3.1/700r4. I know this is nearly impossible without rebuilding the engine and boosting the compression. But, will headers, plenum/tb, cam, and a shift kit do it. I dont care if it is 15.99 aslong as i hit that 15 second mark.

 

I think it is possible. I'm not sure how deep into the 15's that will get you, but, I'm sure that the new cam, and better breathing will help tremendously. One of the best things in the world for your car would be an entirely new tune up. The shift kit however, will be pretty irrelevant, becuase that really isn't going to shave anything off of your times. I put in my B&M megashifter, and aside from looking great, it doesn't really shift any faster than the computer can. If you haven't already done the tune up though, do it. I put on new fuel injectors, new wires/plugs, and if felt like a completely different car. I was running 17 flat with bad injectors, bad plugs/wires, 96 degrees and almost %100 humidity. I'm pretty confident that when I go to the track again I'll be in the high 16's. And thats with only a cat back, snorkel intake, and gutted cat(not much power there, but better than that 12 yr old piece of garbage catalytic converter). There are a lot of variables though, so get the work done and then take it to the track. Good luck!

 

if you check out my website, youll see all my mods, that got me to hit 15.96. if i had better tires, it would have been probably a couple tenths lower. so it takes some $$ to get there but it should be possible. id say, along w/ what you have..... some sort of a legal header to really open up the exhaust, a better intake manifold, a nice cam (hard to get a big one if you have to meet emissions), and all the other bolt ons you can. then get it tuned to get the most out of it. but i dont know what all will keep you legal though. it may be a tough job that costs a ton, but it SHOULD be possible.

 

2 more cylinders

 

such a helpful response

 

a turbo


better?

 

yes

 

A T5 would go a loooooong way toward that

 

what's you r current time?

what have you done for weight reduction?

what are you going to do suspension wise?

 

a shift kit would help, like if its a transgo kit, because it will take away a little bit of that shift lag in between gears. A B&M megashifter isn't a shift kit, thats just a shifter. Using that is like the same thing as shifting gears with the stock automatic shifter, minus the ratchet action and lookin nice.

 

sorry mis read, i thought it read shifter kit. my fault

 

Just out of curosity.. what does a 3.1 auto F-Body run in the 1/4 mile?

how about a 5 speed?

i know the V6 cavalier 5 speeds are running mid 15's bone stock (5 speed) and high 15's (auto)


mine's running 16 flats on a 135K 3.1 with a slipping clutch...

 

I was just going to mention that.

I dunno, I felt really slow at 15.8s in my 3.1/5-speed swapped Skyhawk.

Is it really that hard for a 2.8/3.1 third gen to hit 15s?

If it is, Turbo and/or nitrous, rebuild, etc.

You should only need between 160 to 190 WHP to get well into the 15s, maybe even tip into the 14s. This kinda power is not hard to get on a 660, even iron head. Some wicked porting, cam, headers, better intake design, and some good driving should net mid 15s.
Check out some Fiero boards there are guys that have over 200 HP with carbed 660s.
I think this is one case where I'd adapt a TBI intake (from an s-series) to my third gen and modify the intake to accept an injector in each runner. MPFI, with a better short runner design that works well with the 660. You could probably just run the TBI, since the OEM MPFI ECM just fires all the injectors at the same time anyway, through two outputs from the ECM, and would match up well with the TBI injectors.

 

With a turbo it would be really easy to do. However, without using a turbo it still shouldn't be that hard. With a cam, headers, head and intake porting you should be pretty much there as was already said. Shove a 5 speed in the car and you'll be much further along than that.

I would try headers, plenum/tb, cam, shift kit like you said, along with some head porting and you should be close. If you don't get there with that setup, then maybe a steeper rear gear. I know there is a guy running high 13's all motor in a 3.2L (.030" over 3.1) sunbird. Of course that is in a light sunbird and with a 5 speed, but an engine similar to his in your car should net some mid-high 14's. Here is a link to his site: http://www.j-body.org/members/colin/cars/1/ . Try going to 60degreev6.com and asking around there, they should be able to help you with lots if you can't find your answers here.

I know my 660 with some heads, a cam, and a turbo runs pretty damn good.

Shawn

 

that's a 3.1/3400 hybrid.. exactly the same thing i'm building

you can make 250 HP easy swapping on that top end, port work, big cam, headers and lots of tuning... 300 is even possible

 

Hey, hey, gear down big rig, he was for 15s not 14s, baby steps, BABY STEPS I say!

 

I in the high 15's with a 2.8 auto. You don't need a stick if you have a properly setup auto drivetrain reducing powerloss.

This is also being done with 3.23 gears on a 2.8, not the factory 3.42's. I run 80mph at the top of 2nd gear @5500 rpms. I just lag off the line slightly but make up for it when I get into mid and topend torque this motor has- it lacks major on bottomend but shines in higher revs. I am making power past 5500 but do not take the stock bottom end past that. There is no need to, its not a race car. I just have it geared for getting up freeway onramps.