KingJacobo

I have a '99 with mild bolt on in sig (full exhaust, lid and 4.10s) with Nitto 555s that hook decent but obviously aren't slicks. What's a safe RPM to launch at (on the street mainly) that won't blow my 10 bolt, but isn't a grandma launch?

I'm looking for a launch RPM that can't possibly grenade the rear, but is still gonna get my adrenaline pumping.

Car is a DD!! Not a weekend warrior at the strip. I don't need broken 10 bolts in my life lol

Orange Juice

iTrader: (3)

I don't think anyone can say for sure. I never had an issue when the car was H/C and launching on a street tire but a friend broke the rear end by having one tire on gravel and the other on asphalt while pulling around someone. If you don't want a broken 10 bolt swap it out.

HCI2000SS

iTrader: (2)

The main thing you want to avoid is wheelhop. The Nitto Dr will break loose from a dig fairly easy on the street with no pre-heating and normal tire pressure, so wheelhop will the main concern after that IMO

scotty2000ss

iTrader: (2)

I think if you do a quick slip of the clutch you should be fine at higher rpm's IMO.

murphinator

iTrader: (2)

same opinion here and 3500-3600 is where I would target said quick slip , just enough slip to not shock the drivetrain hard but still aggressive

98CayenneT/A

I don't think he is on a drag radial, I'm assuming the 555 street tire

This
And this, on street tires if that is what your talking about with the 555s imo you should be fine slipping the clutch and still be able to get those things to barrel smoke pretty easily

KingJacobo

I have the 555 street tires, not DRs. By slipping the clutch do you mean just dumping it or easing off it somewhat quickly?

98CayenneT/A

Ease off the clutch as you give it gas at a quick pace, it will take the slack out of the drive train

ULTIMATEORANGESS

iTrader: (4)

if you dont want to break your rear my advice is to not launch it hard at all.

murphinator

iTrader: (2)

on revisiting this post I noticed you also have 4.10's , 410's in a 7.5 10 bolt has an extremely thin ring gear and a tiny little pinion then you have the setup of the gear set on install which is only as good as the person that did it , your rear is more prone to breakage than a stock m6 342 rear.

410s in an a4 car with few mods is a fine upgrade just realize its not a good match with an m6 so my advice is whatever you do do not get the tire/suspension combo so it can hook up the car and as mentioned above wheelhop is also your enemy because it loads and unloads the thin/small gearset.

madmike9396

iTrader: (29)

I voted 3k or higher with some slip

M-Z28

iTrader: (1)

Play at your on risk!!! When it does break look to a S60.. Cost is manageable and will more than likely handle anything you can throw at it.. Your strong parts will always find the weak ones...
$2600 S60 spool and 410s narrowed 3"


Supporting mods LCA's,Torque arm, transmission relocation, etc.

Now the car is fun to drive....

ULTIMATEORANGESS

iTrader: (4)

nice.

M-Z28

iTrader: (1)

Thanks, my brother has been working awhile on this f-body project.. I just recently got into the f-body seen to share the hobby... Damn money pit!!! LOL

Midnight02

iTrader: (8)

Sadly traction and 10-bolt longevity have an inverse relationship. The fact that you're on street tires helps limit traction (and the resulting shock to the drivetrain upon launch) and that's favorable for your rear end.

My experience has been inconsistent, however a few general rules:

1. Quick slip of the clutch on launch will help reduce the "shock" -- that's a good thing.

2. Wheel hop is a problem....if you're spinning, go ahead and chalk up that run as a learning experience.....trying to feather the throttle through that and then hammering back on leads to trouble.

3. The stickier the tire, the more likely you will have trouble.

4. The harder you launch from a dig, the more likely you will have trouble.

5. The advice above will help but doesn't override the fact that the stock rear is too weak to handle what we're throwing at it. There may be flashes of brilliance, but there will eventually be a let down. Personally, I've had 3.90's that held up to 630 rwhp on R-comps and then they gave up on a 3/4 throttle punch at 35 mph on street tires.