[TDIwyse]

Originally Posted by 335dsleeper

What tires are you running? Old? Did you get them hot enough? Track prep OK?

Already posted the tire info in this thread. Bought both sets of Hoosiers new from tirerack. I've tried various tire pressure and burn out routines as suggested by Hoosier. At the present power/torque levels, just can't launch it at anywhere near full fueling without breaking loose and going sideways.

Originally Posted by 335dsleeper

There are quite a few drag radials that will cut a 1.3-1.6 60ft with IRS and coming out way harder than we can with our car.

I agree, but those kind of IRS cars are not optimized for things other than a dragstrip launch. At least the ones I'm aware of.

If one were to modify their BMW suspension for a better straight line configuration it would be possibly to improve the launch. But for good all around handling the suspension is such that it is sub-optimum for an aggressive launch. The mods to make the car launch better would produce a poorer handling car in almost all other areas. That's not something I've been willing to compromise on for my daily driver. If I were to go that route I think I'd just build a 1/4 mile car that goes fast in a straight line and doesn't compromise all the other things that make the 335d a great all around car.

Originally Posted by 335dsleeper

Honestly, my P-zero run flats have plenty of traction when warm. I can't imagine a nice set of drag radials breaking free on a prepped track... especially in 2nd.

I'm glad you have some tires that give you good traction. I haven't found any, including drag specific ones, that give me enough traction for aggressive launches. Even on well prepped tracks.

If you are able to find the combination that gives you sub 1.7 60 ft times please help out the community and let us know.

[petey_highboost]

I'm going to try out later in the season a full 26/8.5/17 slick and see what it does for the 60'

[TDIwyse]

Originally Posted by TDIwyse

... I haven't found any, including drag specific ones, that give me enough traction for aggressive launches. Even on well prepped tracks....

This is from this fall (co-worker was in a car behind me and he has a dash camera) with 16 psi in the Hoosiers and a good burnout before attempting a fairly aggressive 2nd gear launch. I had to let up on the fuel after spinning both wheels for an extended distance due to not being able to hook. This one at least didn't put the car sideways, which has happened before when turning all the traction control nannies off ...

[TDIwyse]

Originally Posted by petey_highboost

I'm going to try out later in the season a full 26/8.5/17 slick and see what it does for the 60'

Please let us know how it works. And good luck! I'd love to learn how to launch these things better.

[petey_highboost]

Originally Posted by TDIwyse

Please let us know how it works. And good luck! I'd love to learn how to launch these things better.

Oh I will, I know that it is a big no-no to have a full slick on the rear and radial up front but I don't think it will affect us much because these cars aren't THAT fast that will result in a hairy or sketchy pass.

I'll be taking two tires off my Evo wheels and mount them on a set of stock 17s. These are the tires

[petey_highboost]

If anybody is interested in a set or drag radials, let me know im pretty good friends with john @ M&H tires and he'll hook us up

[335dsleeper]

Originally Posted by TDIwyse

If you are able to find the combination that gives you sub 1.7 60 ft times please help out the community and let us know.

Will do.

[335dsleeper]

Originally Posted by TDIwyse

This is from this fall (co-worker was in a car behind me and he has a dash camera) with 16 psi in the Hoosiers and a good burnout before attempting a fairly aggressive 2nd gear launch. I had to let up on the fuel after spinning both wheels for an extended distance due to not being able to hook. This one at least didn't put the car sideways, which has happened before when turning all the traction control nannies off ...

So what are all the high HP cars in your area doing? Chargers, challengers, mustangs?

We have 8-9 second cars around here leaving on trans break WAY harder than we can, and they have traction in first. I'm talking street cars too. Drove to the track, run 9's and then drive home. They'r pulling 1.5-1.6's on 275' DOT drag radials. Track prep is crucial.

Here's an old vid of my buddy's car on drag radials and 100% street car.

[335dsleeper]

Rear was stock minus the ring & pinion and drag radials.

Like i said, track prep is CRUCIAL and sanctioning body means nothing! It's all the track crew on that particular day.

My buddy will be running his hellcat on the 5th. 100% stock rear with drag radials. He'll click off sub 1.7's all day. Prob go 8's too.

[335dsleeper]

Originally Posted by petey_highboost

Oh I will, I know that it is a big no-no to have a full slick on the rear and radial up front but I don't think it will affect us much because these cars aren't THAT fast that will result in a hairy or sketchy pass.

I'll be taking two tires off my Evo wheels and mount them on a set of stock 17s. These are the tires

I absolutely caution you with this. I wouldn't do it... Quick and easy way to ding up each corner of your car...

[petey_highboost]

Originally Posted by 335dsleeper

I absolutely caution you with this. I wouldn't do it... Quick and easy way to ding up each corner of your car...

I've seen what happens, espically on a significantly higher horsepower car.. Very sketchy I agree

[iaknown]

Originally Posted by petey_highboost

If anybody is interested in a set or drag radials, let me know im pretty good friends with john @ M&H tires and he'll hook us up

Dude, I'm interested Even a used set in good shape, I'm not going to be able to hit the track much but when I do I want it to be worth it.

[Venom107]

Originally Posted by petey_highboost

If anybody is interested in a set or drag radials, let me know im pretty good friends with john @ M&H tires and he'll hook us up

Petey, I have been looking at the 26 M&H also, or a 245 drag radial.

[TDIwyse]

Originally Posted by 335dsleeper

So what are all the high HP cars in your area doing? Chargers, challengers, mustangs?

I don't actually know... Don't have any acquaintances/friends nearby that drag race. The one co-worker who went with me last Fall does track days, but hadn't been to the strip before. Heck, I'd never been to a dragstrip until a few years ago. I'm an introvert and usually just show up early, by myself, do a couple pulls, and then leave before it gets busy ...

Originally Posted by 335dsleeper

We have 8-9 second cars around here leaving on trans break WAY harder than we can, and they have traction in first. I'm talking street cars too. Drove to the track, run 9's and then drive home. They'r pulling 1.5-1.6's on 275' DOT drag radials. Track prep is crucial.

I agree on track prep. I've been to 2 tracks, and one of them seems to have a better launch surface than the other and has given better 60 ft times.

I'm far from an expert on drag racing and have no other experience than with my 335d. But, if you look at the rear alignment specs for camber and toe on our cars, you'll see a strategy setup for something other than aggressive straight line launches. And how the system flexes/moves under launch is sub-optimum as well. And the weight transfer from front to rear is also sub-optimum. These things can be changed to improve the launch capability, but would result in compromised handling in most other areas.

[NC335d]

Originally Posted by TDIwyse

I don't actually know... Don't have any acquaintances/friends nearby that drag race. The one co-worker who went with me last Fall does track days, but hadn't been to the strip before. Heck, I'd never been to a dragstrip until a few years ago. I'm an introvert and usually just show up early, by myself, do a couple pulls, and then leave before it gets busy ...



I agree on track prep. I've been to 2 tracks, and one of them seems to have a better launch surface than the other and has given better 60 ft times.

I'm far from an expert on drag racing and have no other experience than with my 335d. But, if you look at the rear alignment specs for camber and toe on our cars, you'll see a strategy setup for something other than aggressive straight line launches. And how the system flexes/moves under launch is sub-optimum as well. And the weight transfer from front to rear is also sub-optimum. These things can be changed to improve the launch capability, but would result in compromised handling in most other areas.

TDi, I agree with you when it comes to the rear alignment secs on our cars. Previously I had way to much flex in the rear chassis utilizing my previous setup of Koni Yellow shocks and H&R Springs. After switching to Ohlins with Swift Springs (Higher Spring Rate) and adding Megan Racing Toe Arms there has been a noticeable difference in the way the car launches at WOT. I am no longer trying to keep the car in a straight line and can concentrate on the road ahead along with optimal gear shifting. I believe GreekBoyD also has an optimum track setup, maybe he can chime in also.

Hopefully, once the weather gets warmer I can take the car to the track and do a few 1/4 mile pulls and see what these hybrid turbos can do.

[TDIwyse]

Originally Posted by NC335d

TDi, I agree with you when it comes to the rear alignment secs on our cars. Previously I had way to much flex in the rear chassis utilizing my previous setup of Koni Yellow shocks and H&R Springs. After switching to Ohlins with Swift Springs (Higher Spring Rate) and adding Megan Racing Toe Arms there has been a noticeable difference in the way the car launches at WOT. I am no longer trying to keep the car in a straight line and can concentrate on the road ahead along with optimal gear shifting. I believe GreekBoyD also has an optimum track setup, maybe he can chime in also.

Hopefully, once the weather gets warmer I can take the car to the track and do a few 1/4 mile pulls and see what these hybrid turbos can do.

Thanks for the info on the suspension mods. Really looking forward to results from you guys with more experience and more modifications. Good luck!

P.S. Good grief, you've done a lot of changes to your car! Love it.

[petey_highboost]

The 335i's don't seem to have too much of an issue 60ft'ing? I know that with my Evo when I got it aligned I had them zero out the camber which helped the car 60ft a little. That's also on stock suspension!

About the m&h tires venom, they are 26" which is 245/45/17

[TDIwyse]

Originally Posted by petey_highboost

The 335i's don't seem to have too much of an issue 60ft'ing? I know that with my Evo when I got it aligned I had them zero out the camber which helped the car 60ft a little. That's also on stock suspension! ...

Yes, that's the kind of modification that would help. And similarly with the toe in. As the rear squats the camber and toe move in the wrong direction with the OEM configuration, and causes reduced straight line traction. But making those modifications to improve launch compromises the cars handling in other key areas (like cornering... which I like).

[petey_highboost]

Originally Posted by TDIwyse

Yes, that's the kind of modification that would help. And similarly with the toe in. As the rear squats the camber and toe move in the wrong direction with the OEM configuration, and causes reduced straight line traction. But making those modifications to improve launch compromises the cars handling in other key areas (like cornering... which I like).

Believe it or not but the car still handles pretty damn well !

[335dsleeper]

Originally Posted by TDIwyse

Already posted the tire info in this thread. Bought both sets of Hoosiers new from tirerack. I've tried various tire pressure and burn out routines as suggested by Hoosier. At the present power/torque levels, just can't launch it at anywhere near full fueling without breaking loose and going sideways.



I agree, but those kind of IRS cars are not optimized for things other than a dragstrip launch. At least the ones I'm aware of.

If one were to modify their BMW suspension for a better straight line configuration it would be possibly to improve the launch. But for good all around handling the suspension is such that it is sub-optimum for an aggressive launch. The mods to make the car launch better would produce a poorer handling car in almost all other areas. That's not something I've been willing to compromise on for my daily driver. If I were to go that route I think I'd just build a 1/4 mile car that goes fast in a straight line and doesn't compromise all the other things that make the 335d a great all around car.



I'm glad you have some tires that give you good traction. I haven't found any, including drag specific ones, that give me enough traction for aggressive launches. Even on well prepped tracks.

If you are able to find the combination that gives you sub 1.7 60 ft times please help out the community and let us know.

I'm running Mickey Thompson 285/40/18 ET street S/S drag radial. Made 4 passes yesterday. The quickest 60ft times were 1.78 and 1.74. My car has stock alignment specs and is lowered on ST coilovers. Stock bushings, sway bars and the stock open diff. Both runs were with less than 1/4 tank of fuel.

Once I staged, I foot brake to 2500rpms. I release the brake and instantly go WOT. The car had full traction both runs. Felt so good I wish I had raised the foot brake RPM and tried to come out harder. She just hooked perfectly.

I truly feel sub 1.70 are possible with this tire. The down side to this wide of a tire is I had to roll the fenders (not much, mainly the front arch near the door) and notch the subframe/ rocker bracket. The 285 is currently the smallest size available in 18's. They do have a 275/40/17 that I assume would fit perfectly.

https://www.mickeythompsontires.com/strip.php?item=ETStreetSS

I have a roller is anyone needs to use it.

[TDIwyse]

Originally Posted by 335dsleeper

... The quickest 60ft times were 1.78 and 1.74. ...

This is the best 60 ft times I've seen for a 335d RWD. Nice job.