CALL911

iTrader: (17)

I am wondering how much will my stock rear end hold in my 98 Formula in my sig with drag radials? The clutch is good till just under 500 RWHP, and I will be attempting a track run later today with Nitto 305/35ZR18's. I am just wondering if I should play it safe and stick with my street tires? Or should I be okay even with the drag radials?

I am confident if I put slicks on the car it would be the end of it, but I am hoping DR's won't be too much to break the rear.

Anyone have any info on this?

CCF1000

iTrader: (1)

You can break it with stock power lol, but most of the people i see breaking them with 6 spd cars are usually dumping the clutch at like 4k with a set of MT ET Streets. Feathering the clutch and you should be ok for a while.

tacklebox

iTrader: (10)

I've pulled 1.7-1.8 60' times on my stock rear with M/T et streets, high 11 second 1/4 mile times. The key is to slip your clutch instead of dropping it to preserve your rear.

LT1-DAN

It's a roll of the dice. Stock hp on street tires with an m6 is enough to kill the 10 bolt. I would say you're asking for trouble with DR's.

CALL911

iTrader: (17)

hmmm... Well, I have seen guys have mid 400 RWHP before with DR's and get away just fine, but I just didn't know how "safe" it was. These are guys that were side-stepping the clutch as well (not riding them out safely).

Anyone I have heard about breaking the stock rear without slicks almost always had something else being wrong with their rear to begin with, or had gears making the rear weaker.

More opinions wanted!

blackz6sp

iTrader: (11)

I think you will be alright if you roll out on the clutch, like I used to do in shocker I was pullin 1.7's with junk bfg's.

maxgee

iTrader: (5)

Go out and go easy, or have your AAA membership up to date.
Seriously though have fun and don't make your 1st past your last with a 4k clutch dump.

CAMAROZ28SS

iTrader: (5)

if you blow it up theres your excuse to get a 12 bolt

CALL911

iTrader: (17)

I don't need an excuse. I'll need the $2,000+ it will take to buy it.

stevegrizzle

The method I use is almost like dumping it, but just a hair slower...

Don't buy a 12 bolt, go 9" if you plan on making more than 450rwhp in the future. That way you don't end up doing it again.

SladeX

stock can kill rears

I've done 4k clutch dumps with dead tires, but I have beat on the clutch to off set the saving of the rear. If you do 3k-3.5k clutch dumps you can get away with that all day as long as you aren't sticking off the line.

If you hook, the clutch is worth sacrificing as you can still get home with a slipping clutch. A broken rear is another matter.

Paint_It_Black

iTrader: (1)

I don't care what you've seen, or who has done what.. it's a gamble every time you launch the M6 with sticky tires.

blackz6sp

iTrader: (11)

Ummmm Call911 has been running over 450rwhp for over 6years on the same 12bolt and has never had a problem. (and he has been over 600rwhp for 3years now)

CALL911

iTrader: (17)

Agree with above post. 12 bolts have been proven by countless people to hold well past 900-1000+ RWHP with slicks.

I've beat the living **** out of my 12 bolt with slicks and 600+ RWHP for years and it has never given me any problems. Thats not really rock solid proof as I am just one instance. Try a search and you will find a plethera of guys out there with 12 bolts and gobs of power with tractioin that are just fine.

Back to the original matter though, traction with the stock rear will fry it. There is no real dispute about that. Its just at what power level, and what point of traction is breaking the rear a likely hood, vs a light risk?

I know slicks will destroy it. Plain and simple, as I could drop it at 4,000+ RPM and dead hook. Street tires are fine, as I spin by dropping it at 2500. DR's I believe will be okay as the should only give me another 1000 or so RPM worth of traction before I spin again. But I could be wrong.

stevegrizzle

If ^ is true then why are there so many threads about people breaking their 12 bolts with way less than 1000 rwhp?

Are you saying the 12 bolt is stronger than the 9"?

LT1-DAN

Not sure what answer you are looking for. As stated before guys with stock power levels have broken it on street tires. No one can give you a cut and dry answer on exactly what power level or tire combo that will kill it. As I said before everytime you get on it hard it will be a roll of the dice if it will break or not. It may be sooner or it may be later but for sure it will break, that you can expect.

CALL911

iTrader: (17)

Why would you think that? I am not saying its stronger than the 9, I am saying it will handle most all power levels effectivly (up to 1000 RWHP) without having to go to the 9. How many people really need a rear that will handly 1200 RWHP? Not me. And my guess is, not many others either.

For every one person you can find that breaks a 12 bolt with way less than 1000 RWHP, I could probably find 20 others that have 800-1000 RWHP with their 12 bolt's that have had no issues for years. We may just have to agree to disagree on this one, as I have no doubts the 12 bolt is a fine unit that will hold 99.9% of the guys running up to 1000 RWHP.

I really don't want to scew this thread this way and have it be an off topic thread. Please, if you want to discuss this further, start another thread, and it can be discussed there.

BACK TO THE ORIGINAL POST AGAIN,

It seems there are more out there than I figured who thinks running DR's will break a stock rear. Perhaps its just that I have seen the stock rear hold countless DR runs in M6 cars and never seen one go out. Maybe I am seeing the guys do it that have the better luck than the guys who break.

In either event, I will be attempting to try my Formula with DR's at the track some time. I was going to try today, but due to complications with some DR's I will be running the street tires instead.

94lt1m6

iTrader: (9)

i bet you smoke it cause when your pulling 12.0's on ez launchs your going to want those 11's and launch a little harder and then BAM your toast.

dailydriver

You do have a better chance of it surviving with Nittos vs. any of the other MUCH stickier DRs (especially MTs/Hoosiers).

That is, as long as you take all of the good launch advise above.

CALL911

iTrader: (17)

Ehh, its gonna be like 90 degrees anyways, I am not looking for any record breaking time today. It will be the cars first trip to the track, and I'd rather get used to its characteristics anyhow so next time I can slap the Nitto's on and run the faster time.