[2007/335i/coupe]

Originally Posted by sdiver68

Yes, road race lap times are the best overall indicator. Either C&D or R&T (I forget which since I subscribe to both) is promising quarterly updates on VIR lap times. Personally, I'd like to see them at Road America so I can compare to my own times and I know that track much better, but that's just me One thing to keep in mind, though since we are splitting hairs, is different tracks more fully weight certain factors. For instance, a huge track like RA puts a premium on acceleration and top speed, where as a smaller track like say Barber puts more of a premium on handling for best lap times. And none of those lap times indicate as much unless each car is put on the same brand and type of rubber...something which the better Sportbike-oriented motorcycle mags do in all of their comparos in addition to actual dyno testing, but the car mags claim would be too expensive

I like 1/4 trap speed (versus time) for acceleration because it's much less dependent on the driver's ability to get a great and quick launch.

I also subscribe to C&D and R&T and read about them supplying VIR lap times for specific peformance vehicles :rocks: And I agree and neglected to mention that all road course are not created equal lending to your point on each track having certain characteristics. Another excellent point you mentioned is that the lap times must be on the same track but I don't think we need to go as far as using the same brand and type of rubber in every case. What I mean in this is obviously if you are using R compound tires and pitting it against snow tires, it would not be a fair comparison. But just for the sake of simplicity, similar to what C&D or R&T are planning to do with the published lap times, I only meant to say that a car's general performance can be more easily extracted and understood with lap times that include speed and time check points.

Completely agree that trap speed in the 1/4 is less dependent on driver's ability. However, I have noticed in the past that I would gain higher trap speed at times with terrible 0-60ft time. I never quite understood this

[2007/335i/coupe]

Originally Posted by Weedo

I'll find out next month how well it does on the race course!

Love to see pics and hear your experience!

[Weedo]

Originally Posted by 2007/335i/coupe

Love to see pics and hear your experience!

I'll definitely get some pics and post them!!

[herbz]

gonna guess that the average stg. 1 xede will be around 4.5-4.7 to 60 and 12.9-13.2 1/4 mile.

reason being: magazine times are RIDICULOUS. they launch the cars as hard as possible, as many times as they possibly can until they get the best possible time. now, most people that take their BMW to the track aren't there to beat the living shit out of it. i think 4.1 is basically not gonna happen soon, and we won't be seeing those until some more engine mods are released. not saying its not possible, i just dont think the average driver's gonna be able to do 0-60 in 4.1 with just a xede and exhaust. keep in mind i say the average driver.

[335i=:)]

gonna guess that the average stg. 1 xede will be around 4.5-4.7 to 60 and 12.9-13.2 1/4 mile.

Faster I believe. All the mags got 4.8-4.9, and a couple g-tech posters got 4.8-5.0, and that was in automatics and manuals. I'm calling it 4.2-4.4 with stage 1.

ALso, there are time slips for AT doing 13.3 stock. I believe the difference will be bigger here then 0-60 because the FAT stock powerband was made FATTER when shiv lean the fuel out above 6k rpm to keep it pulling harder above 6k. I think we will see 12.4-12.7 1/4 mile, plus with sticky rubber/wider tires you will shave both down 1-2/10ths. Considering with stage 1 on 91 octane shiv's car has 332WHP and 355 WT and the car weighs 3600, compared to other cars with similar numbers that's about right. The m5 has 505 crank and 385 crank weighs 4100 and does it in 4.1-4.2.

[herbz]

Originally Posted by 335i=:)

gonna guess that the average stg. 1 xede will be around 4.5-4.7 to 60 and 12.9-13.2 1/4 mile.

Faster I believe. All the mags got 4.8-4.9, and a couple g-tech posters got 4.8-5.0, and that was in automatics and manuals. I'm calling it 4.2-4.4 with stage 1.

ALso, there are time slips for AT doing 13.3 stock. I believe the difference will be bigger here then 0-60 because the FAT stock powerband was made FATTER when shiv lean the fuel out above 6k rpm to keep it pulling harder above 6k. I think we will see 12.4-12.7 1/4 mile, plus with sticky rubber/wider tires you will shave both down 1-2/10ths. Considering with stage 1 on 91 octane shiv's car has 332WHP and 355 WT and the car weighs 3600, compared to other cars with similar numbers that's about right. The m5 has 505 crank and 385 crank weighs 4100 and does it in 4.1-4.2.

true, but gearing on the m5 is completely different than on the 335i.

[Weedo]

Originally Posted by herbz

true, but gearing on the m5 is completely different than on the 335i.

Also true, but an Xede 335 will have MUCH more torque than an M5, not to mention peak torque starting so low that gearing will mean essentially nothing.

I have hit 0-60 in 4.8 on my GTech, in Arizona, with 80 miles on the car. I would imagine it will drop a good .6-.7 in the 1/4 mile (70hp equals around .6 - .7 in the 1/4 on average). That should yield a good .4 drop in 0-60.

All these numbers will mean nothing when someone slaps on some DR's or true slicks! Just think, with DR's we should be in the stock porsche 911 range as far as weight and wheel horse power.

[cobradac]

Originally Posted by 2007/335i/coupe

Completely agree that trap speed in the 1/4 is less dependent on driver's ability. However, I have noticed in the past that I would gain higher trap speed at times with terrible 0-60ft time. I never quite understood this

In my testing I found that getting some fair amount of wheel spin at launch resulted in higher trap speeds but poorer 0-60 ft and 0-60 mph (but not by much) times. Apparently you lose time to those marks but end up accelerating faster, later. I used to abort runs with lots of wheel spin but once I noticed on the one or two I kept doing that I got these more impressive 1/3 speed numbers I started finishing more of those runs to check my initial findings. I have a STEP so usually have less variability than I would have in my older (geezer here) manual tranny days. My best 0-60 times usually end up with a 1/4 trap speed of 103-105 but those with high wheel spin and lower 0-60ft times I have had as high as 111-112 mph - not saying my 6er is all that mighty just trying to give my .02 on why trap speeds might be higher in some cases

[xxx_mina]

here is my slip... i broke out so the slow ass vette won ...

video coming soon....



Mina

[Weedo]

Originally Posted by xxx_mina

here is my slip... i broke out so the slow ass vette won ...

video coming soon....



Mina

LOL! Nice reaction time! Did you fall asleep at the line?

Forgive me if I missed this... is your car stock? I'm assuming yes based on the times? And if so, did you order the Xede? Will be good to see the comparison.

[xxx_mina]

lol, my friend was driving, it was his first run with this car @ the track, he was feeling it out... he was concentrating more on getting the launch right than reaction time... its stock, and hopfully by feb i will have the xede...

Mina

[bobnaz]

Originally Posted by Weedo

I GTech'd my 335i faster than the Magnum SRT8 and 300C SRT8 that my wife and I owned. My Magnum (which was slower than my wife's 300) ran a 14.0 at Firebrid. I know, slower than what you've seen but again, our times are slower here. I have no doubt my 335 is a mid 13 second car at the same track. It may be pretty similar to what the 300 would be (lighter than the Magnum by a couple hundred lbs).

sdiver68 - unfortunately all I got was the outdated 0-60 times. But 99% of the time that's all I do on the road anyway. The last time I ran the car 0-100 plus MPH was, uhhmmm, no idea. But I'm plannig on hitting the 1/4 mile as soon as I can!! Who knows, maybe I'll be the first stock vs Xede 1/4 mile runs!

You missed a free track day at Firebird this weekend, couldn't get the car to 140 mph by the time I had to brake....pretty close, 138 mph As you come around to the 1/4 mile straight away, you have about 40 mph as you straighten it up for the straightaway. The car also handled very well on the inside of the course too You better join one of these racing clubs out here to really have fun with you BMW

[jusbechillin]

That sounds like fun. Whats the racing club called?

[Weedo]

Originally Posted by bobnaz

You missed a free track day at Firebird this weekend, couldn't get the car to 140 mph by the time I had to brake....pretty close, 138 mph As you come around to the 1/4 mile straight away, you have about 40 mph as you straighten it up for the straightaway. The car also handled very well on the inside of the course too You better join one of these racing clubs out here to really have fun with you BMW

Hey Bob! I was there actually. I can out on Saturday and watched 2 different sessions of the "red group". Good stuff! Saw plenty of Z06's, that silver Ferrari (was it an F355?), and that whicked blue/pink truck with a 600hp small block on it. Funny how he kept getting passed in the corners but was whicked once he hit the straight. I didn't see you out there in your 335? Or do you run a different car?

I'm planning to do the Jan 5th-ish session. My wife is due any day so unless she's late, I'll be there with helmet on!