Intake and TBs - Aug Fastrack

[Greg Amy]

So the BMW e-36 sedans can choose to use the OBDI manifold on an OBDII motor? What about the cars that only came as OBDII?

I don't know that specific application, but under the current rules you can run the intake that came with either the engine or the car. I can't imagine anyone cares what OBD version you're running.

There's a lot of prep flexibility in STU; feel free to take advantage of it.

GA

[Z3_GoCar]

I don't know that specific application, but under the current rules you can run the intake that came with either the engine or the car. I can't imagine anyone cares what OBD version you're running.

There's a lot of prep flexibility in STU; feel free to take advantage of it.

GA

The OBDI manifold came on the M-50 2.5 liter and S-50 3.0 liter motors from '93 to '95. While the OBDII manifold came on the M-52 2.8 liter and S-52 3.2 liter motors from '96 to '99 in the e-36 sedans. In the e-36/7 Z3, it only came with the OBD II motor. So by this change in the rules the sedan 328 can use either manifold, while the Z3 is limited to the OBD II manifold. The OBD II manifold is the main difference between the M-50 and M-52, same head, cams, valves, even the throttle body, and yet the M-52 is 300cc larger and makes the same peak HP at 600 less rpm.

I decided to just swap to the 2.5 to get the better manifold, and also to keep the weight down. But if someone wanted to build one, it seems like it deserves a spec line exception, because the sedan can swap between manifolds.

[Chip42]

But if someone wanted to build one, it seems like it deserves a spec line exception, because the sedan can swap between manifolds.

easier answer is to not build that motor in the Z3 like you figured out. why should it get a specline to help it? starts getting all messy.

[DoubleXL240Z]

easier answer is to not build that motor in the Z3 like you figured out. why should it get a specline to help it? starts getting all messy.

So, you think a specline would get messy? but, a case by case basis for JDM-yo would be neat and orderly????

[Matt93SE]

a spec line for every engine, manifold, and car combination vs. a list of legal non-US engines?

sounds easier to list a legal engine than to spec-line cars + engines + builds ++++. you'd have 40 pages of cars eligible that would make the Prod and GT lists look simple.

Any case you look at, it's going to be a can of worms.

[Chip42]

So, you think a specline would get messy? but, a case by case basis for JDM-yo would be neat and orderly????

chris, your side won. lets move on. And yes, starting speclines for specific chassis and engine swap / component combinations has the potential to get very messy very quickly.