spot_skater

Alright, so by the end of spring I should have an ACT street/strip clutch, HD pressure plate, and a lighter (looking at 12 or 9.5 lb) flywheel in my car. Other mods in sig. By should have I mean the Clutch kit is sitting on the floor of my room, and I gotta save for a Flywheel...shouldn't take long though, just a matter of actually buying it.

Do you think My car would be into the 14's? If so how much? I'm hoping to get this car to the 14.6-14.3 area at some point. I will not and do not baby this car, taking it up to redline at all shifts.

Basically, with a Good R/T and decent launch, what do you guys think she'll run?
I also plan on getting an SAFCII to have it dyno tuned at T&R in Queens.

The motor is stock ported, until she blows up. She has 115 psi + on both rotors, it was rebuilt about 30k ago. And I have 225/50/16 tires all around, Z-Rated.

Thanks,
James

PS: I weigh less than 150 lbs, and with the slight weight reduction (jack, spare tire, **** out of bins) I think it may help!!

J-Rat

iTrader: (2)

It would be terribly hard to predict your 1/4 mile number based soley on some mods and weight reduction. There is more to the time. Launch, tires, shifting, weather, track conditions etc.. All play on what result you would get. Your best bet is to not speculate, and just get it on the track. Thats where you find out exactly what your car can do.

vipers

iTrader: (8)

dont you think that a 10-9.5 lb. flywheel is a little too light for 1/4 mile? to my knowledge, lightened flywheels are more for road coarses/track racing due to the vehicle staying in the higher rpm's........ if your building a 1/4 mile car, you'd want more of a 20lb. ....... and again, i am more or less asking, not making a concrete staement.......

spot_skater

I'm not trying to build a drag car, or anything like that. After talking to a few friends with 7's, from FB's to FD's, FC's included, a few have told me to go with the lightest flywheel possible.

I just wanted a general idea, but like J-Rat said, I just gotta get my *** out there and do it. Since this is going to be a street car, hopefully seeing some auto-x and a little track time, I figured the less rotational mass the better.

I just wanted to see if I could get some general ideas from the community as to a time I could be looking at, even if it was very general.

Anyway, thanks for the responses guys. I guess I'll let you all know in a few months.

James

powrdby13B

you never shift below redline? including daily driving? That's good on things..
I'd say you'll be at low fifteens for sure.. prolly high 14's with the SAFC.. some bigger injectors would be nice if you could find them... but with a professional tune you might hit mid 14's.

J-Rat

iTrader: (2)

FWIW,

Heavier flywheels are more suited to drag racing.

spot_skater

Not all the time, I meant when driving hard or racing...

This I know. Like I said before, this won't be a drag car, more of a street driven car to have fun in. I'd just like to have a general idea of times.

Thanks for the idea of the times, powrdby13B.

I'm going to be heading to the strip with a buddy of mine with a 95 Integra, GSR swap who runs 15.3 consistently.

Thanks,
James

totallimmortal

you won't need bigger injuectors with a stock port an i highly doubt you'll ever see low 14s on stock ports withough a major power adder. too light of a flywheel will hurt your launch on my NA i got a 15.2 out of it before upgrading the tires, clutch flywheel and intake, basially just a straight pipe echaust on it and no filter at the track. also if you saying you want that light of a flywheel cuase it's gonna be a street car to i hope you realize with a 9lb flywheel and the very little low end tourue you car has it will be triick to to get it moving you'll have to be much more presice, not saying you couldn't do just sugessting you look at a slighty heaver flywheel most aftermarket flywheels tend to keep theiir mass away from the outside of the flywheel like the stock one which makes a bigger diffence then the wieght itself. with what you are gonna do you'll probably see fifteens mist people do, although there are a few of us who can get faster than that a good lauch is key yopu should be able to get at least a low 2 sec 60ft if you can't acieche that you'll have trouble getting that time, also note that these kinds of 60ft time require a very hard lauch i launch at redline and this WILL kill you drivetrain especially with a upgraded clutch i went through two trannys and a axle. if you are going to drage your car frequently and aren't gonna bring a trailer i'd consider upgrading to a tii drivetrain or plan on calling a tow truck eventually cause those launches hurt

KompressorLOgic

iTrader: (6)

seems pretty hard to break into the 14's on a stock ported motor,

id get a LSD rear diff, that will help your launches and 60 ft times quite alot, i think the only way you might,might get into the 14's is, if with those mods you get the lsd and have the SAFC dyno tuned( you will end up leaning it out a bit to make more hp).

that guy claiming get bigger injecters has no idea what hes talking about. the na injectors can suply enough fuel for ,up to around 250 rwhp on a NA engine

Jager

iTrader: (10)

People have gotten into the 14's on a stock motor ! Bunch of guys running low 15's without even a tune .

NA injectors will support 250HP with adequite fuel pressure. Notice how all of Kahren's ports run super LEAN by the end of the pull? No more fuel .

totallimmortal

it's not that hard to break intoi the 14s like i said i got a 15.2 with only exhaust and that was with an open diff and 205 tire and a 2.1 60ft, i find alot of people don't launce hard enough. Now gettin lower into the 14s will require almost every bolt on you can do

spot_skater

Like I said, plans do include an SAFC-II and tuning. And I know it's gonna have to be leaned out quite a bit. Right now I'm guessing the AFR's are around 11-11.5:1, I'd like to aim for 13-13.5:1.

I'm going to re-read all of Kahren's motor build and threads posted by him, so I have more of an idea about the kind of tune I'd be looking into.

Thanks,
James

powrdby13B

No. They won't.
Brian's 88 NA (before he upgraded his injectors and multiple other things):
RB road race header -> custom pipes -> fart cans (not street legal.. but who's checking?)
K&N filter w/ custom pipe again for a pimpish CAI
Ported/modded TB
S-AFC
Aeromotive A1000 fuel pump
some expensive plugs & wires (can't remember) + MSD6A

Car ran a 14.8 with injectors @ max 95%
(then i never pushed um that hard again)
with the weight, it probably had about 180 HP MAX.

Any time. That ^^ is about the best you can do with stock injectors.. i tried just for fun

AFgreasemnky

http://www.web-cars.com/math/qtr_mile.html

Above link will give a rough est. of what your car MIGHT do. Like Rat said there is more to it than just how much HP you make.

Also on the flywheel subject

Equivalent weight = 0.5*(flywheel weight)*[(flywheel radius*gear ratio*final drive ratio)/(tire radius)]^2

If yo do the math a lighter flywheel WILL actually make the car feel lighter through the first couple gears, ( roughly 200lbs in 1st....) And will add responsiveness (spelling?) to the engine. So why would this be bad for drag racing?

My only thought would be that the revs might drop to much between shifts? Possably taking you out of the power band?

J-Rat

iTrader: (2)

Its got alot to do with the inertia thats stored in the heavier flywheels. It definately helps the launch, because of the additional energy wont drag the motor down as far when the clutch is released. Also, there is less loss of energy during shifts (I dont lift to shift, so it wouldnt effect me as much). Thing is, lightened flywheels dont make horsepower, they just free up some that you already had.

AFgreasemnky

But wouldnt that help in drag racing? I would assume that you would get a much better 60 ft time?


( side note, Rat im planning very similar mods to you, and already have a lightened flywheel... So we'll have to race next winter when i move back to AZ... )

J-Rat

iTrader: (2)

No, because the launch would be adversely affected by the lighter flywheel. With less rotational inertia, the engine would be dragged down further, and would be more prone to bogging. This might be compensated for with higher launch RPMs, but when I am already launching at 5k on a stock fly, how much further am I expected to go?

Race?! anytime you are ready! By next winter I plan to be over 400 RWHP and in the 11s. Only got 3 tenths to go!

AFgreasemnky

Yeah i might be close to that spending all my hard earned deployment money!

No worrys though most of the parts are already sitting in Germany waiting on me ....

arghx

iTrader: (3)

with my 17lb flywheel and ACT heavy duty clutch i have to launch it at LEAST 6000 not to bog

spot_skater

That's only 7 lbs less than stock, too.

If I launch my car with the stock flywheel and current mods listed in my sig, at 3500, the tires will spin and spin and spin.

Launching at 6000 RPM doesn't spin your tires real bad?

James

arghx

iTrader: (3)

I've got LSD and 225/45/17's. It will chirp some but definately anything under 6k makes it go NOWHERE. The fact that my auxilaries are wired open at the moment could be part of the problem. Oh well, I'll have my electronic six ports working in a couple days now.

You have an SE, and thus no limited slip. So that doesn't help. Plus I've got a heavily modded N/A engine with basically no low end at all--header, open exhaust, street port w/ T2 housing, TB mod, etc.

Jager

iTrader: (10)

I don't need a fuel pressure regulator or anything? Proper voltage? Also the rx7.com calculator says at 95% percent duty cycle that the 460's are good for 251 HP at the flywheel too ;O!

So where is your argument going?

spot_skater

Yeah, I've got an SE...but soon enough I'll probably have a LSD from a GTU in her. So that will definitely help. Auxilaries wired open probably does make it a bit hard for you to launch under 6000, too.

James

KamakazieX

stay with the stock flywheel, it all goes back to the laws of physics; kenetic energy. Though it will take longer to engage the clutch (split seconds) the weight of the flywheel will better transition the shift of tourqe.

InGroundEffect

I know for a fact that this car http://www.bobbyjasan.com/project/87...rx7stage20.asp runs 14's on a stock motor and transmission. It has had some serious weight reduction though. No interior at all, Lexan windshield, one seat etc.

Looks like *** but goes like stink.