First 1/4 Mile Results and Questions

Originally Posted by jashearer

What track are you going to? Would love to come out and watch.

Cordova is open for a test n tune tonight if you want to make the 1- 1 1/2 hour drive east. Its a decent track.

Jay

Thanks for the tip.

Since the local track event was canceled (the race director had a heart attack which is why the weekend events got canceled... hopefully he's recovery rapidly and his family is doing well) I spent the beautiful Fall day lumberjacking and cutting/loading/hauling/unloading a massive oak tree from our family timber and I'm whooped. Must say I like loading up that big'ol inline 6 Cummins Diesel with a fully loaded tandem axle trailer and letting it growl :-) Plus I've started imbibing so any possibility of making it to the strip tonight are long gone . . .

When looking for local strips I didn't see that one you mentioned. Google says it's a 2hr 15 min drive, which means a 4.5 hr round trip. That's 2.5 hrs more driving than the one in Cedar Falls. But I'll keep in mind. Thanks.

Nice saw

You are in Cedar Rapids right? I wouldn't trust google on that calc... unless you are are 30 mins from IA City, then maybe...

Let me know when you are headed up to Cedar Falls, I would make the drive. I'm trying to sell my V and would love to get into a 335d to polish out my garage full of diesels.

Jay

Originally Posted by TDIwyse

...I spent the beautiful Fall day lumberjacking and cutting/loading/hauling/unloading a massive oak tree from our family timber and I'm whooped...

Looks like an MS290 with 24" bar, by the number of teeth. I have an earlier 029; doesn't look as purty as yours!

Poulan buyers are pussies, Husqvarna buyers have holes in their head. Stihl is the only saw to buy.

Originally Posted by floydarogers

Looks like an MS290 with 24" bar, by the number of teeth. I have an earlier 029; doesn't look as purty as yours!

Poulan buyers are pussies, Husqvarna buyers have holes in their head. Stihl is the only saw to buy.

HA!

Close. Actually it's a MS361 with 20" bar. A 24" bar would've worked better for that tree though...

Originally Posted by jashearer

Let me know when you are headed up to Cedar Falls, I would make the drive. I'm trying to sell my V and would love to get into a 335d to polish out my garage full of diesels.

Jay

I'll consider that.

Been very pleased with the 335d (still can't believe they brought that to the US). Hope you find a nice one!

Just ran a 12.6 @ 109.7 on the first pull. Stopping while I'm ahead and heading to famous daves. Time slip to follow.

Sent from my ADR6325 using Bimmer App

Originally Posted by TDIwyse

Just ran a 12.6 @ 109.7 on the first pull. Stopping while I'm ahead and heading to famous daves. Time slip to follow.

Sent from my ADR6325 using Bimmer App

That's money. Nice cool air to feed the turbos.

What tires were you using?

Jay

Originally Posted by jashearer

What tires were you using?

Jay

Sorry you weren't able to make it today. Hope you have a great time tomorrow.

Fantastic rib day at Famous Dave's . . .

Running Hoosier DOT Drag Radials in 245/45R17 and had them at ~27 psi. Got a much improved 60' launch compared to last time. These are a fairly big increase in diameter(26.2 in from their website) over stock. Did this due to the car shifting before the 1/4 ml point with the OEM size tires at ~106-107mph into the headwind from last time at the track. Calculated the car should be able to do ~109-110mph with no headwind and thought the larger diameter tires would help avoid a shift near the crossing. The car still shifted into 5th near the finish line, but things were happening so fast couldn't tell if it was just after or just before.

The track runs due North.

https://maps.google.com/maps?oe=utf-...d=0CIIBEPwSMAA

The weather has been cold and rainy. The ground and track were cold at racetime. Temps for the pull were ~48 with a ~5mph WSW wind.

http://www.wunderground.com/history/...statename=Iowa

Got destroyed by the other guy who was there for the race competition, but was happy to achieve the goal.

Oh, and after eating ribs, topped off with fuel for the 60mile interstate trip home. Car recorded 42.7mpg's as it pulled into the garage with primarily 75 mph speeds. Really like this car.

That seems like a really high psi setting for a sticky tire? Is that common though for BMWs?

It's definitely higher than what a lot of others run them at. Had read best results come from using the most psi as possible while still getting good grip (more psi gives less rolling resistance). From the previous Gtech testing it seemed a ~2 sec 60' time was achievable with 25-30psi in the Hoosiers, and that time point was what it looked like would be needed to get into the mid 12's. The slush box tranny really reduces the violent start compared to dumping a clutch in a stick so ... used more psi.

Could probably break boost higher rpm's and run lower psi's to improve the 60' and improve the ET. But dang, that's a lot of stress on things.

Originally Posted by TDIwyse

It's definitely higher than what a lot of others run them at. Had read best results come from using the most psi as possible while still getting good grip (more psi gives less rolling resistance). From the previous Gtech testing it seemed a ~2 sec 60' time was achievable with 25-30psi in the Hoosiers, and that time point was what it looked like would be needed to get into the mid 12's. The slush box tranny really reduces the violent start compared to dumping a clutch in a stick so ... used more psi.

Could probably break boost higher rpm's and run lower psi's to improve the 60' and improve the ET. But dang, that's a lot of stress on things.

Yeah drag racing can be pretty brutal on parts if you get overly serious about your times.

Originally Posted by TDIwyse

Just ran a 12.6 @ 109.7 on the first pull. Stopping while I'm ahead and heading to famous daves. Time slip to follow.

Sent from my ADR6325 using Bimmer App

The fastest 335d on record! Great job man! Post that time up on drag times!

Decent 60 too. I suspect you can get that down a bit further and improve on that time.

Felicidades TDIwyse great job

Originally Posted by Axel61

Felicidades

Had to look that up ...

Thanks

Well, last years 1/4 mile performance wasn't a fluke...

Improved just a tad today from last years 12.69 to a 12.65 today, with less favorable conditions.

Today was opening day at the nearest 1/4 mile track. Wasn't planning on going until the night before when an obligation got canceled. So, I was able to try some of the new things, but the car wasn't optimally prepared. It had too much fuel (2/3 full of fuel) and the temps were a little warmer than last year. Oh well, it was still a chance to learn.

The car was heavier by 50-60 lbs from last year due to more fuel and more urea. More urea in the tank than last year (last years run was very close to the yearly maintenance and today was less 1/2 way to the yearly service). The temps were pretty good at ~65F, but that was ~18F warmer than last years run.

Also used slightly smaller diameter drag radial. Last years run was larger than stock diamter 245/44/R17 drag radials. Todays was with 225/45R17's which are close to stock diamater.

So, a recap of differences from last year include:
1.) 225/45R17 drag radials vs last years 245/45R17
2.) Customized the water/methanol injection. I made a circuit modification to the Snow boost based controller that creates
a 2D controller ... It now works based on boost AND rpm. Our cars make max boost happens at the lower rpm's and then taper off slighter at higher rpm's. This causes a problem with a boost only controller as you can bog down at the lower rpm's
if you have things setup for optimum higher rpm performance. So now it has an additional rpm component. It will
turn on if enough boost is present (adjustable level) AND based on a minimum rpm (adjustable). If those are satisfied
the output is proportional to rpm's. At full fueling the water/methanol starts at ~2000 rpm's at ~350ml/min and maxes out
at ~4500 rpm at 700 ml/min. Both last and this year used 50/50 mix.
3.) 65F this year vs 47F last year.
4.) ~60 lbs heavier than last year.
5.) Stock intake, stock intercooler, stock exhaust, stock differential... same as last year.

The smaller diameter tires helped the times, even with the heavier vehicle. But I'm at a frustrating point where the 4-5 shift is occurring right at the 1/4 mile point. The top speed is a tad slower this year even though the time is quicker. The smaller tire caused the 4-5 shift to occur before the 1/4 mile point. The shift point causes a loss of application of power as during the shift the power output is cut to help the transmission's longevity ... Last year the larger diameter tire caused the shift to occur right as I was crossing the line. This year with smaller tire it happened right before ... Not sure how to optimize this problem any further. Basically I can trade off a faster 1/4 mile ET with the larger tires, but a faster 1/4 mile time with the smaller tires. Think for real world/street application the smaller diameter tire is the way to go.

Had a great time chatting with the former BMW tech I met during last fall's run. He was there with his car, but broke something in his drivetrain on his 2nd run. He had a co-worker who was the diesel calibration technician at a major heavy duty ag company ... we went over the car, what mods it had, and what he's seen in real world applications for his companies modern diesels (EGR, SCR, DPF, Carbon buildup, how to work around emission components ...). Was fantastic to have a face to face with someone who knows their modern diesel technology.

So basically what I'm seeing is that to significantly increase capability will get really, really expensive and make the car less user friendly and emission clean. I'm not keen on removing the DPF due to the smoke/stink. And at this point it doesn't seem to be causing any performance issues. Think I'm probably at the end of my tweaking on this vehicle as its my main ride now and having something I can daily drive in all conditions (except deep snow) is a priority. I may go back again to the track if the weather is perfect and I have time to get the car in the proper condition (~1/8 tank of fuel, lower urea capacity, cooler temps... strong tail wind :-)).

Happy dieseling everyone.