Supersprint Headers VS Euro Headers

[RossBMWZseries]

Originally Posted by FD3S

Ross thanks for your answer. Do you have done a dyno with your setup?
One silly question what is CEL?
I have never read on the forum anyone to go with TTFS with his Z4M. Do you have any feedback about TTFS?

Thank you again.

I've never dyno'd the car as the local shop here in my area doesn't dyno imports. The nearest location is about 6 hours away I believe.

CEL-Check Engine Light. I believe on the Z4M it says "Service Engine Soon" (SES from this point forward lol). In the event that my car is really trying to warn me with a SES light, I won't know because my light is already lit up

I don't have much feedback on TTFS for the Z4M (Tuning Tech Frank Smith) but I've read/heard about TTFS relative to the S54 on E46 M3's. Should be identical or similar tuning on our cars I suppose.

Here's another link about Z4M tune options

http://www.zpost.com/forums/showthread.php?t=1350004

[pokeybritches]

Originally Posted by tikamak

Why ?

You have a large diameter change in your exhaust, which affects the velocity. Pressure and velocity are inversely proportional, meaning high speed = low pressure, low speed = high pressure. Going to a larger diameter slows the flow and increases back pressure. It's probably not a huge difference, but if you're looking to squeeze every last horsepower out of the car, then it's worth a couple hundred dollars to have resonators welded in.

Resonators help clean up the sound without affecting the flow to a great extent.

Originally Posted by FD3S

What happens if you delete the O2 Sensors? Since the website of the tuner says he can delete the O2 sensors.

There are two sets of O2 sensors - primary and secondary. Primary control fuel trims and cannot be "deleted". Secondary sensor readings are compared to primary sensor readings by the ECU to measure catalyst efficiency, and the ECU throws a Service Engine Soon light if the primary and secondary readings are too similar (inefficient/no cat) or too different (clogged cat). On US cars, the ECU is programmed to run an efficiency test of the catalytic converters every so often. A lot of tuners that "delete" the O2 sensors really just change the duration of this test, making it go to infinity. So, the car will never fail the test if the test goes on forever, and therefore won't throw a check engine light. However, it won't ever pass it either, so it won't pass emissions.

It is possible to tune the car to have it show that it passed, showing "ready". Emissions places have gotten smarter and some reset the ECU, and if the ECU still shows "ready" vs "not ready", they know you're cheating.

Originally Posted by FD3S

Damn that S-pipes with cats of Superspint are expensive Is there any alternative to them?

I bought the catless/straight s-pipe and then had HJS cats welded in later. HJS cats are the best you can get, and they are what Supersprint use.

Originally Posted by DanFromTucson

The V2 stepped headers have a 2-bolt flange at the end so that they will bolt to a stock section 1.

The V1 header is slip-fit over the SuperSprint section 1 (no flange at all).

Correct. Additionally, they take a different routing. V1 requires a V1 s-pipe. V2 will bolt to any OEM or similar s-pipe. V1 make more power, but requires a greater initial investment (both headers and s-pipe).

Originally Posted by DanFromTucson

There are also a lot of people on this forum saying that the SSV1 headers don't fit on the Z4M. Mine fit fine (coupled with new motor mounts), but do vibrate against the transmission cross member very slightly under certain conditions.

Mine had been modified by the previous owner. One of the ends had been cut and welded at a slightly different angle. I have no vibration issues.

I noticed the RE transmission mount bolts are longer than OEM, and cause vibration issues with most aftermarket s-pipes. I trimmed the end of one bolt to provide enough clearance.

Originally Posted by RossBMWZseries

I don't have much feedback on TTFS for the Z4M (Tuning Tech Frank Smith) but I've read/heard about TTFS relative to the S54 on E46 M3's. Should be identical or similar tuning on our cars I suppose.

I have the TTFS tune on one of my Z4M's. Performance is spot on. Frank can do amazing things, but it can be difficult to get ahold of the shop.

[Beedub]

when i went to the DKF with the 100 CELL units... the noise volume went up so much i may as well have gone catless and resonators... Once you get to 100 CELL i dont think they are much of a restriction.

[FD3S]

Superspint Stepped headers V1 for Z4M is the same with the M3 E46 Supersprint headers right?

[habitat412]

Originally Posted by FD3S

Ross thanks for your answer. Do you have done a dyno with your setup?
One silly question what is CEL?
I have never read on the forum anyone to go with TTFS with his Z4M. Do you have any feedback about TTFS?

Thank you again.

CEL = check engine light

TTFS is legit for tuning our cars. Very meticulous the way he does the tuning.

[tikamak]

Originally Posted by pokeybritches

You have a large diameter change in your exhaust, which affects the velocity. Pressure and velocity are inversely proportional, meaning high speed = low pressure, low speed = high pressure. Going to a larger diameter slows the flow and increases back pressure. It's probably not a huge difference, but if you're looking to squeeze every last horsepower out of the car, then it's worth a couple hundred dollars to have resonators welded in.

Resonators help clean up the sound without affecting the flow to a great extent.

So moving to a larger diameter exhaust will actually make me gain power, no ?