[UsedF10M5]

Originally Posted by Give_Em_The_DD

I haven't gotten any wheel hop...and i cut 1.5-1.7 60s

Cut an 11.363 @ 122.xxx

Hoping for 10s in 2 weeks...

Glad to hear XI's are holding up lol, what is your tire and suspension setup?

[wgknestrick]

Originally Posted by Sikh335xi

What are you guys doing about wheel hop on an XI?

It was fun cutting low 60ft times until it started hopping like a mofo.

You can try more pressure in your tires to give you less grip (or using harder tires). Wheel hop is from the tires gaining/losing traction quickly, with short periods of bogging the engine as the tires grip. More air pressure tends to narrow the "hop window". Launching at higher RPM (or higher boost target) will also help create more torque and less hop (not as safe though).

You DON'T want hop (avoid it like the plague), and I would recommend trying to move the traction window towards wheel spin instead of hop or bogging. Hop tends to break things. It's the narrow window between full on bogging (where grip>engine torque) and wheel spin (grip<engine torque).

For fastest, safest, AWD launches you want to just be inside the wheel spin zone.

[proTUNING Freaks]

The best way to deal with launches is to leave the OEM suspension in place. Lowering the car upsets suspension geometry and really hurts launches. If you're running coilovers, with IRS (independent rear suspension) you want to set them to full hard in the rear and full soft in the front to promote weight transfer. Soft rear suspension was great prior to IRS so you could get the car to squat. Squating at launch is very hard to pull off with IRS on the car so you can only work with what you have. LSD and good tires with softer sidewall will help.

[Give_Em_The_DD]

Originally Posted by Sikh335xi

Glad to hear XI's are holding up lol, what is your tire and suspension setup?

I actually didn't really intend to drag my car, but kinda got hooked into it.


Last spring I didn't have a dedicated set of "track wheels"

I just ran 245/35/18s PSS square with my kw v1s

Never had any traction issues, wheel hop etc.

[wgknestrick]

Originally Posted by Give_Em_The_DD

I actually didn't really intend to drag my car, but kinda got hooked into it.


Last spring I didn't have a dedicated set of "track wheels"

I just ran 245/35/18s PSS square with my kw v1s

Never had any traction issues, wheel hop etc.

....So share some data

PSI on tires?
Tires?
Launch RPM?
Launch Gear?
Launch Boost target?

[Welterweight]

11.3 on an XI? And your manual? I am at 12.0 at 115mph and 1.7 60ft. I would love to crack 11's next month. Only mod since my first track day is gonna be bmw PE.

What's your secret?

NVM I see you have RB's on your car. I was on the mobile. Thought you were at 11.3 with stock turbos....haha

[altostratus]

Ran a 13.0xx last fall with a 1.894 60ft on my 20"s with 2 people in the car...I was pretty impressed. No wheel hop either.

[UsedF10M5]

A lot of valuable information guys, thank you!

I know how bad wheel hop is and I'm trying to get it sorted out before I Break something lol. I used to visit the drag strip regularly and had a constant 1.6 60ft, but now it just hops so I keep my launch happy ass off the track.

I'm lowered on HR Sports stock shocks and struts, a little over 90K on the setup now so i know they are getting weak and may not be keeping the tires planted. I don't know if my tire setup could be an issue, 8.5 front 9.5 rear and 235/35/19's all around. The rear is stretched, it looks pretty but it doesn't feel pretty when it's hopping all the way through second unless I let off.

I'll even get some hop in 3rd from a 60roll if I spray but it hooks up pretty quick at that speed.

[blown07]

Originally Posted by Sikh335xi

A lot of valuable information guys, thank you!

I know how bad wheel hop is and I'm trying to get it sorted out before I Break something lol. I used to visit the drag strip regularly and had a constant 1.6 60ft, but now it just hops so I keep my launch happy ass off the track.

I'm lowered on HR Sports stock shocks and struts, a little over 90K on the setup now so i know they are getting weak and may not be keeping the tires planted. I don't know if my tire setup could be an issue, 8.5 front 9.5 rear and 235/35/19's all around. The rear is stretched, it looks pretty but it doesn't feel pretty when it's hopping all the way through second unless I let off.

I'll even get some hop in 3rd from a 60roll if I spray but it hooks up pretty quick at that speed.

You should measure the circumference difference front to rear as this may not be considered a setup an XI would be happy with.

[UsedF10M5]

Actually I did notice it get crazy after going all 235/35's. I Used to have 235/35 front and 265/30 rear on the same wheels and only had hop under wayyyy hard acceleration.

I'm going to start with air pressure adjustments, I still have my other set of tires so I'll switch back to those and only after that chase suspension issues. I know bushings might be getting soft but they aren't torn or anything.

A part of me thinks it might not be wheel hop at all though and maybe a transmission shudder.

Thanks again guys.

[v1nc86]

no wheel hop here... I cut 1.7 60'... and run 12.6 @ 109

(stock turbos, stock downpipes, no meth, 94 octane)