[arayz]

hi its not my car but damn its fast

[TDIwyse]

Nice! The awd should really help the ET with getting better grip at the launch.

121.17 mph trap speed, if I'm converting the kph to mph correctly. Well done.

And based on the flags it looks like he was fortunate to have a huge tail wind helping push him down the track.

Do you have details on the track so we can find the ambient weather conditions? Would be interesting to compare wind and weather adjusted trap speeds .

[arayz]

yea the awd and the transsmission is awsome my old boss owned a 435d, the thing dosent spin at all way better awd then audi

its the same transmission as rs7 so yea it shift damn fast

im thinking of getting a 435d and do the mods i had on my 335d i guess ill get 500-530 engine hp

that maybe will put me on high 10s


i think its poland but no idea wich dragstrip

[arayz]

tdiwyse u should try to higher ur psi mine was running alot more then you the car can take it

and ur 60 foot time aint that good put som real drag race tires and go down to 11.5-11.4

[TDIwyse]

Originally Posted by arayz

tdiwyse u should try to higher ur psi mine was running alot more then you the car can take it

and ur 60 foot time aint that good put som real drag race tires and go down to 11.5-11.4

Yeah, there's no way the RWD variant will get to the same 60 ft capability of the AWD version with equivalent tires. The AWD will always have a major advantage on the ET due to the better launch capability. Even with really good drag slicks like I've been using, controlling the spin on the launch with the RWD and this much torque is tricky. I've not seen many RWD 335d's catching a significantly better 60 ft time. But, every 0.1 you gain on that 60 ft generally works out to 0.15-0.2 sec on the ET, which is why the AWD has an advantage.

Doing some quick "estimates" on mph corrections based on how fast that tail wind appears to be blowing, I'd think his real 1/4 mph speed would be closer to 119 mph.

[DWR]

It has been proven time and time again, if you want to go fast at the drag strip, RWD has the advantage. The problem is our OEM suspension, especially the sport, is not setup for drag racing. Now, if you want to do anything else, like go around corners , drag strip suspension isn't going to cut it. The exception is programmable, active suspensions.

[TDIwyse]

Originally Posted by DWR

It has been proven time and time again, if you want to go fast at the drag strip, RWD has the advantage. The problem is our OEM suspension, especially the sport, is not setup for drag racing. Now, if you want to do anything else, like go around corners , drag strip suspension isn't going to cut it. The exception is programmable, active suspensions.

Interesting. I went and looked at dragtimes, and sure enough, the 335i's have faster times than the xi's. I had always been told awd should allow better launches. That does not appear to be the case.

One of those 335i's w RWD is laying down 1.5x 60 ft times. Wowzer.

[Hoooper]

All wheel drive allows better launches on street tires by a long shot, but they lose a lot of that advantage when you start getting into true drag tires since those tires can hold way more power than our cars are capable of putting down. At that point all wheel drive is just a source of drivetrain loss. For the 335i I suspect you also get a lot more guys heavily modifying the rwd platform, and from what I understand there are strength concerns for the awd system holding a lot of extra power. Aside from our suspension not being set up for it, our brakes are also too big to allow us to use the truly legit drag tire sizes. I wonder if the low 60' you're seeing for 335i is the base pre-lci version, I thought they could fit a 15" wheel which allows you to use all the best tires for drag racing.

[iaknown]

Originally Posted by Hoooper

For the 335i I suspect you also get a lot more guys heavily modifying the rwd platform, and from what I understand there are strength concerns for the awd system holding a lot of extra power.

This is correct. I have a few 335i contacts making big power and there are not many guys bothering with the xi platform. Not to say it isn't effective, just most guys know what will happen with stock awd and the 600-800whp they are making. Plus their power curve, 2-step, trans/clutch combos, etc are a lot more "drag launch oriented" than ours. So I wouldn't go strictly by what Dragtimes shows and apply it to our diesels (also look at the difference/lack of mods on the xi times).

That being said, rwd having an "advantage" is certainly relative to the application. As stated, if you have a car like ours with ridiculous torque and big brakes, the video (and ET) in this thread shows quite well what advantage awd has. Same goes for most diesel pickups, there's a reason they have slicks on all fours All depends on the application.

[DWR]

Originally Posted by iaknown

This is correct. I have a few 335i contacts making big power and there are not many guys bothering with the xi platform. Not to say it isn't effective, just most guys know what will happen with stock awd and the 600-800whp they are making. Plus their power curve, 2-step, trans/clutch combos, etc are a lot more "drag launch oriented" than ours. So I wouldn't go strictly by what Dragtimes shows and apply it to our diesels (also look at the difference/lack of mods on the xi times).

That being said, rwd having an "advantage" is certainly relative to the application. As stated, if you have a car like ours with ridiculous torque and big brakes, the video (and ET) in this thread shows quite well what advantage awd has. Same goes for most diesel pickups, there's a reason they have slicks on all fours All depends on the application.

Lol, I was pretty sure, looking at the video, the application was drag racing.
I'm not arguing that AWD cannot help a vehicle that is ill suited to the application. However, RWD always is advantageous, if you can figure out how to plant it. Here's a picture of a drag racing diesel truck that illustrates the point I was trying to make.

[TDIwyse]

Originally Posted by DWR

... Here's a picture of a drag racing diesel truck that illustrates the point I was trying to make.

What do you think his AFR looks like? Good grief...

[iaknown]

Originally Posted by DWR

Lol, I was pretty sure, looking at the video, the application was drag racing.
I'm not arguing that AWD cannot help a vehicle that is ill suited to the application. However, RWD always is advantageous, if you can figure out how to plant it. Here's a picture of a drag racing diesel truck that illustrates the point I was trying to make.

Well physics proves I can't argue with your point but I still had to mess with you

Yet that is certainly a big "IF" dealing with our cars. The next fastest 335D we will probably hear about will be detuned just to deal with the horrendous traction issues faced off the line. So, if an awd XI can stay together under high power, it will be a tough car to beat any other way. Personally, I didn't think the drivetrain would take it.....

[DWR]

Originally Posted by iaknown

Well physics proves I can't argue with your point but I still had to mess with you

I wouldn't have it any other way.

[DWR]

It takes some work to get an IRS to plant right. Getting the front to lift a little at launch isn't too hard. Basically, you need to spend the same kind of effort on the suspension that we tend to spend on the engine.

Here's some pointers:
- Providing adjustment and firm mounting on a rear roll bar is a step in the right direction. Essentially, getting the IRS to act more like a live axle. What happens on launch is the right rear compresses and the left rear lifts; the bar will help minimize this greatly.
- Adjustable shocks allow reduction of rebound damping on the front and increased compression damping on the rear.
- Adjustable coilovers allow adjustment of suspension height. A lowered car changes suspension angles in ways that are not conducive to hard forward acceleration.
- Redistribute weight in the rear get equal loading at launch. Not this is not the same as equal weight.
- Rear camber adjusters allow positive camber on rear wheels, ensuring full contact patch when the rear squats.

All of these can be adjusted at the track and returned to 'street' settings for the drive back home.

[Fundguy1]

Xi front differential and axles on the BMW are not that strong either. Most people start blowing stuff when they hit 500hp+ which is another reason you don't see many people doing this.

[Puerto Rican 335d]

holy GUACAMOLE thats fast!!!

[Charged]

More fast 335d:s, 1/4mile @ 11,1sec in street class :

[Zarrachan]

To bmw to e90 �� 335xd jedyne taki

[TDIwyse]

Congrats to that car. Any info on the location so we can compare the track and ambient conditions?

198.24 kmh trap speed is 123.18 mph.

He had a fantastic launch. Looks like he's taken a lot of weight out of the car, as the hood has all kinds of holes in it, and holes in the front bumper area (getting a little Frankensteined here :-) ).

Wonder if they removed additional things in the car for weight reduction?
The way the weight shifts at the start looks like he might also have removed the front sway bar, which would help weight transfer to the rear wheels and improve the launch and reduce more weight...

[robnitro]

It's also an Xd so awd must have helped the launch. Lower trap than your run, and you're probably heavier so he's got less hp...

[Mik325tds]

Wow. These runs really put TDIwyse's trap speed into perspective. In my opinion TDI still better. Of, course that is with my completely unbiased, objective opinion...

[335dsleeper]

Is the 1.69 his 60ft?

Originally Posted by robnitro

It's also an Xd so awd must have helped the launch. Lower trap than your run, and you're probably heavier so he's got less hp...