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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Vishnu Tech: 10s 1/4 run VBOX data analysis



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      05-20-2012, 02:37 PM   #1
shiv@vishnu
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Exclamation Vishnu Tech: 10s 1/4 run VBOX data analysis

Hi guys-- Sean and I just left LA. Only 360 miles to go before we are back in the Bay area. The 335 is a champ. I don't think there are many other platforms in this price range that we would be comfortable doing this with (driving 1000 and running 10s, all within 36hrs with no support car/crew). And the car just past 90k miles during this trip!

Finally getting a chance to look at the vbox data from the 1/4 mile pass. Some interesting data. Can't post graphs from the road so I'll post them when I get back to the office tomorrow.

Peak/sustained acceleration G:
1st gear: 1.3/1.15
2nd gear: 0.87/0.82
3rd gear: 0.61/0.60
4th gear: 0.55/0.34

Shift time (deccel duration between gears)
1-2. 0.38s
2-3. 0.41s
3-4. 0.38s

Trap speed: 132mph
WHP Calculator results using 3500lb vehicle weight (with driver) and theoretically "perfect" driving in ideal conditions.


http://www.race-cars.net/calculators...lculator.html: 628whp
http://www.dragsource.com/index.php?...&calctoview=5: 629whp
http://www.fbody.com/calc.htm: 628whp

We have attempted to dyno the car with slicks before to verify but they end up turning to mush and sliding around on the rollers. A good testimate on how much power they are absorbing is 20-25whp due to tire tread distortion (from being an under-inflated bias ply). But they certainly more than make up for it with traction benefits (1.5x 60' time!). I thought the HP calculator results were interesting because one of our competitors is trying to suggest that the car is underperforming at the track based upon published dyno results. Sometimes I really question the motivation of others who have nothing to gain by spreading misinformation. As well as that of some of their customers do buy into their disingenuous nonsense.

Some more data crunching also suggests that we should be able to shave at least 0.05-0.07s off of every shift based upon other runs (on precious days). So I'm quite confident that the car has a mid to high 10.6 in it with just faster shifting. And another .05-0.1s in the launch (the car bogged slightly in the run). So we are projecting low 10.6s when all is said and done in these relatively warm conditions in a "perfect" run (if such a thing even exists). Once we reach that or something close to it, we will starting bumping up power again

Again, thanks to all those who have supported and encouraged us along the way

Last edited by shiv@vishnu; 05-20-2012 at 03:16 PM.
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      05-20-2012, 02:49 PM   #2
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Sounds good.
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      05-20-2012, 02:50 PM   #3
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Awesome! Congrats on the world record and achieving 10s!
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      05-20-2012, 02:57 PM   #4
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Also, being you only get 1 or 2 passes in a day, with more runs than that in one day alone, you are going to be knocking those numbers down run after run.
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      05-20-2012, 02:58 PM   #5
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I cant wait to see this car run with 100% power...hopefully when you increase the HP you will be able to put it all on the ground.

Great work though keep it up!!
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      05-20-2012, 03:03 PM   #6
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Quote:
Originally Posted by venom3469 View Post
I cant wait to see this car run with 100% power...hopefully when you increase the HP you will be able to put it all on the ground.

Great work though keep it up!!
Thanks! With the suspension, slicks and our new 2-step code, I don't think we will be dealing with traction issues ever again. So now it's just about driving well and making power. Which is a nice change finally
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      05-20-2012, 03:13 PM   #7
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Loving the results
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      05-20-2012, 03:14 PM   #8
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I like where this is going. Great job Vishnu and FFTEC
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      05-20-2012, 04:17 PM   #9
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just out of curiosity...what did the vbox show as 0-60?
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      05-20-2012, 04:21 PM   #10
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How much does a roll cage weigh? Seems like it's inevitable progression for your car.
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      05-20-2012, 04:47 PM   #11
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Quote:
Originally Posted by stilov View Post
just out of curiosity...what did the vbox show as 0-60?
It said 3.1s which actually isn't that great compared to 6ats which launch in 2nd gear and avoid the 1-2 shift.
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      05-20-2012, 04:48 PM   #12
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Quote:
Originally Posted by pits200
How much does a roll cage weigh? Seems like it's inevitable progression for your car.
I don't think he has one built in yet. If you watch his 10sec pass you can hear the lady talking about how if he is going to run that quick he will need one. Lol he got his 10sec run in and said it's cool I'm heading out.

I could be wrong but I have been following the threads since this thing has started and I haven't heard of him mention of putting one in.
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      05-20-2012, 04:49 PM   #13
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How much does a roll cage weigh? Seems like it's inevitable progression for your car.
A 5pt roll bar should add around 60 lbs
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      05-20-2012, 04:52 PM   #14
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Along with the 2-step, are you able to create traction control within your system?
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      05-20-2012, 06:18 PM   #15
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Shiv, I think you're being modest. 3.1 Seconds 0-60 with a MT is super fast. The best times an Enzo and 599 have ever put down are 3.1 with F1 transmissions. Special Edition models got there in 2.9, but still...

Seriously, what are your get-away driver rates? There are some Graff stores that need a-robbin'
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      05-20-2012, 07:31 PM   #16
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Time to get this car in the 9's, big turbo time?
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      05-20-2012, 09:10 PM   #17
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So the Vbox was right on target trap speed wise? Or did it read around 134mph? How did the ET compare with the time slip?
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      05-20-2012, 10:01 PM   #18
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Quote:
Originally Posted by Laguna Seca Blue View Post
Shiv, I think you're being modest. 3.1 Seconds 0-60 with a MT is super fast. The best times an Enzo and 599 have ever put down are 3.1 with F1 transmissions. Special Edition models got there in 2.9, but still...

Seriously, what are your get-away driver rates? There are some Graff stores that need a-robbin'
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      05-20-2012, 10:23 PM   #19
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I'm not sure if anyone else has brought this up, but at the crank, this is probably a 700HP car... with a 3L engine. That is a specific output of ~233HP/L - absolutely insane. For stock, force inducted cars, that absolutely blows them away:

GT-R: 139.5HP/L
TT RS: 145.2HP/L
Lancer Evo: 145.6HP/L
MP4-12C: 156.1HP/L
GT2 RS: 172.2HP/L

Yes, I realize those are stock, and don't require meth, etc, etc, but Shiv's 335i is still a stock engine short of the turbo. Pretty incredible.

-Rich
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      05-20-2012, 10:47 PM   #20
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Quote:
Originally Posted by richpike View Post
I'm not sure if anyone else has brought this up, but at the crank, this is probably a 700HP car... with a 3L engine. That is a specific output of ~233HP/L - absolutely insane. For stock, force inducted cars, that absolutely blows them away:

GT-R: 139.5HP/L
TT RS: 145.2HP/L
Lancer Evo: 145.6HP/L
MP4-12C: 156.1HP/L
GT2 RS: 172.2HP/L

Yes, I realize those are stock, and don't require meth, etc, etc, but Shiv's 335i is still a stock engine short of the turbo. Pretty incredible.

-Rich
Personally saw a GTR make 832 whp on a Mustang dyno. That would translate into 243HP/L using your conversion rates to bhp. And that's also on a completely stock block.

Which means that in terms of hp/l, the Vishnu 335i is barely behind what GTR's are maxing out at on a stock block (granted the GTR's are still twin turbo) but that says something about the N54.
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      05-20-2012, 11:08 PM   #21
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      05-20-2012, 11:12 PM   #22
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Quote:
Originally Posted by Brey335i View Post
Personally saw a GTR make 832 whp on a Mustang dyno. That would translate into 243HP/L using your conversion rates to bhp. And that's also on a completely stock block.

Which means that in terms of hp/l, the Vishnu 335i is barely behind what GTR's are maxing out at on a stock block (granted the GTR's are still twin turbo) but that says something about the N54.
DAMN, is that without meth as well?

OT but I just cant seem to decide, invest in a single turbo kit or wait a little and invest in a GTR haha
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