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BMW Diesel Owners / Enthusiasts
Do you own a diesel powered BMW? Maybe a 335d or a BMW x35d? Come and talk about what makes your car great!

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  #1  
Old 09-05-2010, 11:20 AM
HIREN HIREN is offline
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335d JBD Quarter Mile results

I had a chance to take the 335d to the drag strip recently after installing the JBD. I only got 3 runs in since it was so busy at the track. I was planning on testing the car with and without JBD, but didn't get the chance. All 3 runs are with the JBD at 100%. My car has 19" 313 wheels with non-rft contisportcontact 3 tires which throws a variable in to the mix. The weather was around 78 F. The car has about 10k miles.

Best run:

13.4 @ 103
1.99 60'

The car weighed in at 3965lbs with me in it! I had about a quarter tank of diesel in the tank. When the car was stock with the sport 18" wheels and michelin RFTs it ran a 14.0@100 with about 2k miles on the odometer in cooler weather.

I expected a low 13 and higher trap, but until I test the car without the JBD on the 19"s I don't know how much the wheels affected the time.

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  #2  
Old 09-05-2010, 03:40 PM
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Flyingman Flyingman is offline
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So what is time for 0-60?
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Last edited by Flyingman; 09-06-2010 at 04:17 AM. Reason: Happy?
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  #3  
Old 09-05-2010, 04:40 PM
HIREN HIREN is offline
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First off - Edit your post to get rid of the ridiculous quote. There was no need to quote my entire post or any of it for that matter. It just clutters the thread.

Second - People don't go to the quarter mile track to get their 0-60 time! People also don't measure power gains by just 0-60 times. Thus, 0-60 is pretty irrelevant to me. ET and especially trap speed tell much more about how fast a car is.
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  #4  
Old 09-05-2010, 05:20 PM
TForan TForan is offline
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Looks pretty good to me. To think that a 183 cubic inch diesel could beat 95% of all the old muscle cars is impressive. Drop the temp 20 degrees and run 17s, it would be close to 13 flat.
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  #5  
Old 09-05-2010, 08:01 PM
ZQQM ZQQM is offline
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Quote:
Originally Posted by HIREN View Post
Second - People don't go to the quarter mile track to get their 0-60 time! People also don't measure power gains by just 0-60 times. Thus, 0-60 is pretty irrelevant to me. ET and especially trap speed tell much more about how fast a car is.
Agreed, if anything 0-100-0 is more relevant than just 0-60. It's a standard test for euro car magazines. Give you an idea on overall performance ( acceleration & braking ).

HIREN, thanks for the results on the JBD, any feedback or data helps people make their decisions on future upgrades. Straight up, thats dam impressive for a diesel.

And TForan I think your right, more favorable temps and less rotational mass could drop you down to low 13's.
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  #6  
Old 09-05-2010, 09:36 PM
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sno_duc sno_duc is offline
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Something else to think about. What was the cetane rating of your fuel??
This stuff is very popular with the diesel racing / tractor pulling crowd.
http://www.syndiesel.com/
@ 60 cetane 5 gallons mixed in with what's left in the tank ought to put the blend over 50 cetane, which is closer to european diesel than most of what we get in the US.
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  #7  
Old 09-05-2010, 11:00 PM
HIREN HIREN is offline
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I am not sure of the cetane rating of the diesel, but I am betting it is at least 48. After some research online I came to find out my county and many surrounding counties have laws in place requiring a minimum cetane rating of 48 for diesel fuels distributed and sold in the area.
I always fill up at the same HEB store.
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  #8  
Old 09-06-2010, 03:26 AM
tlak77 tlak77 is offline
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HIREN, thanks for posting the results - good job. Can you elaborate on your technique a little - thanks.
ZQQM, you know 0-100-0, is in km 0-60-0 would be almost as relevant if you care about breaking...
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  #9  
Old 09-06-2010, 04:21 AM
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Flyingman Flyingman is offline
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Quote:
Originally Posted by HIREN View Post


First off - Edit your post to get rid of the ridiculous quote. There was no need to quote my entire post or any of it for that matter. It just clutters the thread.

Second - People don't go to the quarter mile track to get their 0-60 time! People also don't measure power gains by just 0-60 times. Thus, 0-60 is pretty irrelevant to me. ET and especially trap speed tell much more about how fast a car is.
Resolved problem above, thanks for point this out.

Back to the question.

I'm not the 1/4 mile track type, so wouldn't know, but then that is obvious.

0-60 and 0-100 is what all the comparisons in automotive websites advertise. I just want to know if I'll beat the 335i next to me to the next red light!
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  #10  
Old 09-06-2010, 07:01 AM
Marine5302 Marine5302 is offline
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Quote:
Originally Posted by HIREN View Post


First off - Edit your post to get rid of the ridiculous quote. There was no need to quote my entire post or any of it for that matter. It just clutters the thread.

Second - People don't go to the quarter mile track to get their 0-60 time! People also don't measure power gains by just 0-60 times. Thus, 0-60 is pretty irrelevant to me. ET and especially trap speed tell much more about how fast a car is.
Have a bad day yesterday? True it clutters a thread but Flyingman is not a troll and contribites to the forum. If you felt that strongly about it you should have sent him a private message.
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  #11  
Old 09-06-2010, 07:07 AM
ZQQM ZQQM is offline
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Quote:
Originally Posted by tlak77 View Post
ZQQM, you know 0-100-0, is in km 0-60-0 would be almost as relevant if you care about breaking...
Actually thats not true, I'm referring to AUTOCAR ( a large British publication ) in which they've been quoting 0-100-0 ( MPH ) for years. They use MPH in England as apposed to KPH. So this is a great indication of a cars' overall performance, Acceleration / stability / Braking.

Shortly after I start modding my cars for more speed, I also address the braking ability of the car. Some cars have wicked acceleration, but can't pull off a full on stop from 100mph without lots of length and drama.

Either way, Im impressed with HIREN's low et, looking forward to more runs/data.
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  #12  
Old 09-06-2010, 07:54 AM
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sno_duc sno_duc is offline
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Quote:
Originally Posted by ZQQM View Post
Shortly after I start modding my cars for more speed, I also address the braking ability of the car. Some cars have wicked acceleration, but can't pull off a full on stop from 100mph without lots of length and drama.
Best example of that is old jeep's. Take out a flathead / f-head four and shoehorn in either a 225/231 V-6 or a small block V-8. The brakes were just barely adequate for an anemic four popper.
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  #13  
Old 09-06-2010, 08:07 AM
HIREN HIREN is offline
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My technique:
I kept it in DS and turned off DSC, then power braked it through first gear to clean off and warm up the rear tires, not enough to cause smoke. Then I just punched it, no brake torque as that caused too much spin off the line.

I still haven't met a 335i on the road or track that wanted to run, but judging from the numbers it should be somewhat close with the stock 335i pulling on the top end. I don't think the 335d would have a chance against a JB 335i.
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  #14  
Old 09-06-2010, 01:22 PM
tlak77 tlak77 is offline
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Quote:
Originally Posted by ZQQM View Post
Actually thats not true, I'm referring to AUTOCAR ( a large British publication ) in which they've been quoting 0-100-0 ( MPH ) for years.
Stand corrected I wish I could have more chances getting 0-100mph, but its hard to do in the city
T
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  #15  
Old 09-06-2010, 08:48 PM
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Stugots Stugots is offline
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First off, as was mentioned, you need to calm down. Nice that you provided results, but no need to be a dick to people who've been around here and contribute quality to this forum and the diesel community.

Second, your launch technique needs a bit of work, but since you've only had the opportunity to do 3 runs, you're forgiven this time.

1. Don't start in DS, start in manual, shifted to 2nd (first gear launches are strongly ill advised)
2. Brake boost to about 2k RPMs
3. Make sure that all forms of traction control are off.
4. Don't warm up your tires, unless you either have DRs or you're planning on swapping them out a whole lot sooner than their expected life. On street RFTs (or non RFTs, even), you're really not doing yourself a big favor by spinning in the box.

If you want better times, the above will assist in that. Your wheels are going to spin no matter what you do, so do what you can to mitigate (2nd gear launches are a must for the car).
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  #16  
Old 09-06-2010, 09:16 PM
HIREN HIREN is offline
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Stugots,

I would have thought starting in 2nd would just slow the car down. I'm assuming you've tried both 1st and 2nd gear starts at the drag strip? Also what are your reasons for not recommending 1st gear starts besides wheel spin?
Also I don't get the tires wet or spin in the box. I just spin them after avoiding the box before l get to the line. This doesn't really warm the tires, but gets all the debris off them.

The next time I take the d to the track I'll try the 2nd gear launch, manually shifting earlier, reducing rear air pressure to 30 if needed, and also a run without the JBD if I get the chance.
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  #17  
Old 09-06-2010, 11:07 PM
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Stugots Stugots is offline
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Quote:
Originally Posted by HIREN View Post
Stugots,

I would have thought starting in 2nd would just slow the car down. I'm assuming you've tried both 1st and 2nd gear starts at the drag strip? Also what are your reasons for not recommending 1st gear starts besides wheel spin?
Also I don't get the tires wet or spin in the box. I just spin them after avoiding the box before l get to the line. This doesn't really warm the tires, but gets all the debris off them.

The next time I take the d to the track I'll try the 2nd gear launch, manually shifting earlier, reducing rear air pressure to 30 if needed, and also a run without the JBD if I get the chance.
The other reason for the non-first gear starts is because you'll trip so fast through first that you won't be able to time your shifts. Also, make sure to time your shifts at right around 4k through 3rd to get the most out of the transitions.

If you're running RFT's, reducing tire pressure will not increase traction (the stiffer sidewall prevents that), so if you have them, don't waste your time doing that (I'm mentioning this since you obviously don't have RFT's). Reducing tire pressure for runs is a common way to assist in traction.
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Last edited by Stugots; 09-07-2010 at 06:27 AM.
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  #18  
Old 09-07-2010, 06:06 AM
Snipe656 Snipe656 is offline
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Quote:
Originally Posted by Flyingman View Post
Resolved problem above, thanks for point this out.

Back to the question.

I'm not the 1/4 mile track type, so wouldn't know, but then that is obvious.

0-60 and 0-100 is what all the comparisons in automotive websites advertise. I just want to know if I'll beat the 335i next to me to the next red light!
I tend to look at the mph a car gets in the 1/4 and a lot of magazines do give 1/4 dragstrip figures. I look at th mph because it tends to be more consistent than the times. Times can change a lot based on traction and/or driver.
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  #19  
Old 09-07-2010, 11:25 AM
TForan TForan is offline
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Quote:
Originally Posted by Stugots View Post
The other reason for the non-first gear starts is because you'll trip so fast through first that you won't be able to time your shifts. Also, make sure to time your shifts at right around 4k through 3rd to get the most out of the transitions.

If you're running RFT's, reducing tire pressure will not increase traction (the stiffer sidewall prevents that), so if you have them, don't waste your time doing that (I'm mentioning this since you obviously don't have RFT's). Reducing tire pressure for runs is a common way to assist in traction.

If you floor it in second if will kick down into first. Do you mean to ease the pedal down, so you don't hit the kickdown button?
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  #20  
Old 09-07-2010, 02:11 PM
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If you floor it in second if will kick down into first. Do you mean to ease the pedal down, so you don't hit the kickdown button?
You've obviously not used your full manual mode.
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  #21  
Old 09-07-2010, 02:50 PM
TForan TForan is offline
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Quote:
Originally Posted by Stugots View Post
You've obviously not used your full manual mode.
So, in full manual, if you have it second and floor it, it will stay second?
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  #22  
Old 09-07-2010, 10:01 PM
HIREN HIREN is offline
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Quote:
Originally Posted by Stugots View Post
You've obviously not used your full manual mode.
TForan is right. Even in manual mode in 2nd gear if you floor the pedal clicking the kickdown button the car will downshift to 1st. If you press the pedal all the way without hitting the kickdown button it will stay in 2nd.
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  #23  
Old 09-07-2010, 10:10 PM
Snipe656 Snipe656 is offline
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Just curious but with the 19s is the overall height of your tires taller than with the 18s? I am guessing not but curious since that would have some effect on your times.
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  #24  
Old 09-07-2010, 11:33 PM
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autoJeff autoJeff is offline
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Originally Posted by TForan View Post
So, in full manual, if you have it second and floor it, it will stay second?
I tried it today.

1) Shift to DS
2) Come to a complete stop
3) Press paddle to switch to M2
4a) Step on accelerator most of the way, but not kick-down. It remains in M2.

1) Shift to DS
2) Come to a complete stop
3) Press paddle to switch to M2
4b) Step on accelerator all the way to kick-down. The display instantly switches from M2 to M1.

I also verified that my car up-shifts if I accelerate through redline while in full manual mode. I could swear that when the car was new (Jan 2009 build) it would bounce off of the rev limiter while in full manual mode. But maybe that was just me not recognizing the traction control cutting power by a lot.

Also, in DS, my car likes to upshift near or at redline. Some people in this forum claim their car shifts closer to 4k RPMs.

I wonder if different versions of the car's software behave differently. Maybe we're all right, but for that software that is in our own cars? Did someone say that the transmission's model number changed somewhere between 2008 and 2011?

Last edited by autoJeff; 09-07-2010 at 11:35 PM.
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  #25  
Old 09-08-2010, 03:33 AM
Snipe656 Snipe656 is offline
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I have only tried DS a couple off times in my car but it has never bounced off the rev limiter. I do not think it goes to redline either but not 100% sure on that part.
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