i need some help with the math!

[mossaidis]

the autotechnic guys do some damage in ITS with their 323is sedan. If all things are equal, if should not matter if it's a coupe or sedan. Write to the CRB - good luck!

[Tim Dugan]

Yes the "C" stands for coupe and the auto technic cars are built to the max! Mine will be a little slower at first but hopefully within a couple of years we can get the car twisted just right and if something happens to ITS the car can be converted to ITR with very little work. So back to my question how do i find a realistic build up % on the motor? The motor is stock with a shark programing so just trying to figure out what is a realistic WHP for the car and how much its gonna cost to get there? I know the answer to that open check book and start with adding a lot of zeros! LOL my goal is to keep up with the RX8 this year and maybe even beat him. (sinister laugh)

[Ron Earp]

I don't know how much hp you can make out of the motor, but if it is going to race competitively in ITS it'll need to generate north of 185 whp at that weight. And well north is what I'm thinking, 195-205 wheel hp at 3000 pounds.

I have no idea of the BMW engine can generate that sort of power. Certainly it seems the unrestricted BMW E36 325s of the 2002-2005 era were making that sort of power and more, but I don't know how that engine compares to yours.

Good luck with it, I'd love to see it out on track.

[Greg Amy]

Can't help you with the math, but I think you're gonna need some help with the finances!!!

[mossaidis]

Math forthcoming....

2000 BMW 323 Ci

2.5L hp I6
chp 170 @ 5500 RPM
ctorque 181 @ 3500 RPM
Bore X Stroke 3.31 X 2.95
Compression Ratio 10.5:1

https://ams.scca.com/netForum/eweb/d...%20Process.pdf

170 * 1.25 (IT gains) * 0.82 (driveline loss RWD) = 174.25 whp * 12.9 lbs/hp (ITS multipler) = 2248 w/o adders or 2250

Do you have excessively large brakes? It's a BMW, I would assume so, +100 (in your face!)... so 2350.
Could there be a torque adder? maybe, if so then add another +100 (in your face... maybe)... so 2450

no way.

Let's try the other way around...

3000 - 100 = 2900 / 12.9 lbs/hp = 225 whp...
225 whp / 0.82 = 274 chp

OR

3000 - 200 = 2800 / 12.9 lbs/hp = 217 whp...
217 whp / 0.82 = 265 chp

Either I forgot to add something or you need to lots of luck ( I mean $).

Confirmed that the 99-00 323is/i seems like the same car as your 323 Ci.

[lawtonglenn]

170 * 1.25 (IT gains) * 0.82 (driveline loss RWD) = 174.25 whp * 12.9 lbs/hp (ITS multipler) = 2248 w/o adders or 2250

Do you have excessively large brakes? It's a BMW, I would assume so, +100 (in your face!)... so 2350.
Could there be a torque adder? maybe, if so then add another +100 (in your face... maybe)... so 2450

IIRC the process weight is on crank hp, so you don't include the 0.82

so... maybe:

170 * 1.30 (BMW IT gains) = 221 * 12.9 lbs/hp (ITS multipler) = 2850 + 50 brakes + 50 torques + 50 wishbones? = 3000

[RSTPerformance]

Tim- when "converted" to ITR what car model does it become? How much needs to be swapped? I only ask as I know this is your ultimate goal.

Raymond

[mossaidis]

IIRC the process weight is on crank hp, so you don't include the 0.82

so... maybe:

170 * 1.30 (BMW IT gains) = 221 * 12.9 lbs/hp (ITS multipler) = 2850 + 50 brakes + 50 torques + 50 wishbones? = 3000

Thanks Glenn, I think you got, except I don't think BMW's come with DW suspensions. Perhaps 50 adder for brakes and 100 for torque. By those numbers Tim needs to put down ~181-2 whp to make process power. Like Andy said, in full 10/10th mode, they probably make MUCH MORE as witnessed repeatedly.