Changed headers from B&B to Fabspeed today

[911st]

I do not know what is best for the the O2.

However, oil on the O2 is probably not a good thing.

Once I had a turbo seal going bad that seemed to drain a quanity of oil into the exhaust. If the O2 is after the turbo I wonder if this could be a consideration.

[wcc]

Originally Posted by 911st

I do not know what is best for the the O2.

However, oil on the O2 is probably not a good thing.

Once I had a turbo seal going bad that seemed to drain a quanity of oil into the exhaust. If the O2 is after the turbo I wonder if this could be a consideration.

That is a good point. However, I think based on the cost I would rather replace a sensor than a turbo and a sensor. Even though, as RarlyL8 pointed out, is rare.

[sjf911]

I have killed a couple of sensors located between the turbo and muffler from heat and for that reason I relocated the sensor to just after the muffler on my RarlyL8 exhaust. It has worked fine in this position with good correlation on the dyno.

[RarlyL8]

There are heat sinks that you need to use with the muffler neck location. I've had a sensor in that spot for several years.

[sjf911]

Originally Posted by RarlyL8

There are heat sinks that you need to use with the muffler neck location. I've had a sensor in that spot for several years.

LOL, I had a heat sink with the last one. I suspect a lot of it had to do with tuning issues and excess heat from timing and mixture issues. The EDIS controllers that I used before to run my ignition would occasionally default to their "limp home mode" at a fixed 10 degrees of timing. I also wonder if there is any difference between the 930 and SC's in heat dissipation in the rear.

[orac69]

Sorry to resurrect such an old post - but I too have the Fabspeed headers + twin-out exhaust, with what I believe is the standard O2 bung placement in the headers before the turbo - the J pipe I think it is known as?

..anyway, I understand there is a remote chance that a broken sensor can send shrapnel through the turbo, but my question is CAN a wideband O2 sensor (like the one that comes with the Innovate MTX-L) be placed in this standard location?

Will it give accurate readings than can be relied on?

It seems a bit of a shame to have to remove the polished stainless muffler etc. and drill / weld a big new bung hole in it...

[9Thirty]

So if BB and Fabspeed are not that good, what headers/exhaust systems for a 930 are considered the best?

[Tt surgeon]

Fabspeed one year, no issues at all. Pertect fit, finish, heat, etc.

[JFairman]

"CAN a wideband O2 sensor (like the one that comes with the Innovate MTX-L) be placed in this standard location?
Will it give accurate readings than can be relied on?"

You're best off asking Innovate that question so you will get the correct answer instead of a bunch of opinions.
They tell you the high exhaust backpressure in the exhaust primary tubes of a turbocharged motor throws off the reading of a bosch wide band O2 sensor.

The origonal narrow band O2 sensor for the lambda emission system works fine in exhaust backpressure so they put it before the turbo where it reads all the exhaust mixed together to pass EPA emission testing.

[vas930]

Originally Posted by 9Thirty

So if BB and Fabspeed are not that good, what headers/exhaust systems for a 930 are considered the best?

If you want heat, the B&B is about as good as you will get off the shelf.
Good fit, power and heat. IMO

For great power and at a good price, talk to Brian.
Not sure if he has the heat issue solved.
I use the B&B headers with Brians muffler.
Great combo, I lost about 800rpm of lag and have heat.

[Tt surgeon]

Has anybody ever dyno'd different headers back to back?
FS vs rarlyl8 vs BB, now that would be interesting.

[vas930]

Originally Posted by Tt surgeon

Has anybody ever dyno'd different headers back to back?
FS vs rarlyl8 vs BB, now that would be interesting.

I think TK have done some testing.
Not sure on what brands.

[Tt surgeon]

TK, can you post the results?
Tia

[RarlyL8]

I've tested and replaced every type of 930 headers on the market. Short tube is short tube, all produce the same power only difference is build quality. All are 304 or lesser stainless. Mine are medium equal length with merge collectors and properly angled waste gate pipes on each bank, 321 titanium/nickel stainless alloy. My 300WHP engine went to 350+WHP with no other addition than my headers. Typical short tube units may add 35HP but you can't say for sure because the boost creep issue some have due to the badly designed elephant nose common waste gate pipe. You also must keep in mind that header design must follow the application. Primary sizing etc must complement the other components of the build. That is why I offer 2 sizes of primary pipes, T3 or T4 flanges and single or dual waste gates.

[Tt surgeon]

Good info, thanx.