Speed Question - Page 2 - BMW Forum

saltshaker185 · 09-12-2006, 09:50 PM

even with the chip and stuff the gear ratios only allow it to go 155... whats the dealio yo?? how did you all score higher?

superdeadman · 09-12-2006, 10:09 PM

eric got turbo - you can def. go past 155 with the ratios

i know a buddy of mine on 02 M3 stock went 175mph

saltshaker185 · 09-12-2006, 10:17 PM

Quote:

Originally Posted by superdeadman

eric got turbo - you can def. go past 155 with the ratios

i know a buddy of mine on 02 M3 stock went 175mph

im not talking in terms of power,,, im talking about gear ratios... at redline with stock gear ratios in a e36 m3 you can only go 155... eric has a rear diff thats not stock so i can almost assume his could be ligit, but im not calling m3ound a liar... just dont know why it would show him 162 if he has stock ratios... someone help me out here...

edit- i just checked and with erics ratio it would only allow him to hit 159 at redline... hmph...

Ivan · 09-13-2006, 01:33 PM

Quote:

Originally Posted by KSE36M3

woops I guess I kinda missed the stock part haha

i lied, i think it has a chip or something

///M Power · 09-13-2006, 03:55 PM

Salt, a Porsche is not a BMW. Each gear can be different thn those numbers but can have the same final drive ratio. And on top of that, i've got a higher redline. I'm sure M3UOND has a higher redline with his software aswell.

And on top of that, i've got a 95 M3. That means 3.15, not 3.23. And my rear differential is stock. 3.15 is stock in 95s. 3.23 is stock in 96+. I dont remember what's in the automatics.

saltshaker185 · 09-14-2006, 11:43 PM

Eric, this isnt just a porshe gear program... it was made for a porshe racing team to easily figure out ratios and all and it works for any car and any ratios and the result will be the same as all it does it plugs the numbers in formulas.

The higher redline would not make that much of a difference, for instance it only makes 163 mph at 7k rpm with your ratios... i took into respect that you have a 3.15 lsd (looked in your profile) and only found the difference to be like 3 more mph... still doesnt come out for the numbers you all are getting... this is wierd, if you want i can send you the program for you to mess around with... i do everyonce in a while just for the hell of it...

MiguelACA · 09-15-2006, 12:18 AM

hey salt, ur program says he can only hit 159 at redline, eric said hes done 164 indicated mph, the speedos on these cars are a little fast, maybe he didnt actualy hit 164, but thats what the dash is saying...

///M Power · 09-15-2006, 08:49 AM

Bigger wheels and tires also salt, although this shouldnt translate to indicated.

Does anyone have information on what exactly our ratios are stock in every gear?

and how I know i did 164 was through the OBC.

DIRTE30 · 09-15-2006, 08:55 AM

The bigger wheel diameter will effectively raise your final drive ratio a bit. This along with not so perfect speedo indications could account for the difference in percieved MPH and Calculated MPH!

Teh Prof · 09-15-2006, 10:07 AM

Quote:

Originally Posted by saltshaker185

Attachment 24548

even with the chip and stuff the gear ratios only allow it to go 155... whats the dealio yo?? how did you all score higher?

My tachometer needle hits redline at about 7300, not 6800. Presumably that would make a bit of difference?

Edit: yeah, I'd like that little widget program you've got. nhannan1 at yahoo dot com.

saltshaker185 · 09-15-2006, 03:46 PM

I sent that M3UOND.

The one i have been getting these answers from were with stock M contours, which would be what the speedo is set at and the computer. You may have Physically been going that fast, but the computer wouldnt/ shouldnt read that fast... is there a varible were leaving out??

Teh Prof · 09-15-2006, 04:44 PM

So I was just playing with the program Nick was using.

Basically his numbers were a little off on the gear ratios for my car. Quoting from the bmwmregistry.com site about my car: "Starting with the 1997 model year, the ZF 5HP18 five-speed automatic returned as an option with the same internal ratios used on the 3.0-liter model: 3.67 (1), 2.00 (2), 1.41 (3), 1.00 (4), .74 (5)." The automatic M3 also has a 3.38 differential. Using the same tire diameter size as Nick did, 155 mph only brings me to 5279 rpms. My redline is rather higher than that. Assuming my engine pulls that hard, my top speed is over the 180 mph that Nick's widget will calculate for. 180 mph only brings me to 6130 rpms. However, I doubt my engine is that powerful.

I may have to put up with a slushbox in my M3, but it goes like a scalded dog on the top end.

Edit: And that, ladies and gentlemen, was my 1,000th post on this website. Suitably profound, if I do say so myself.

///M Power · 09-15-2006, 05:37 PM

3.38 is quite a bit shorter than a 3.23.

I already told you what variable you missed. Look at your gear ratios per each gear. Not just the final drive.

german-speed-demon · 09-22-2006, 02:51 PM

143 in e30 BAUR Tc Hartge

saltshaker185 · 09-22-2006, 05:29 PM

Quote:

Originally Posted by ///M Power

3.38 is quite a bit shorter than a 3.23.

I already told you what variable you missed. Look at your gear ratios per each gear. Not just the final drive.

i got the gear ratios for each gear right out of the bentley, so thats why i didnt think they could be off... i think that the extra rpms could kick it just high enough to hit your numbers eric, and m3uond i think that the automatic ratios would be make up on your case... also i did plug in your 3.15 final gear ratio eric when i did all this and found that it still wouldnt make much of a difference... im not sure but maybe its a rounding error somewhere...