My Car At Riss Racing ...

[M3This]

Those of you that know me from M|U this will be old news, but since Im new here I thought I would share it with the rest of you guys.

I recently dropped off my car at Riss Racing and they used my car to develop a new exhaust system and both catted and catless downpipes as well as O2 Sim so yoy dont get a annoying CEL.

Here are some of the photos of the work:

Car on the lift:



Looking into intake development:



Downpipe removal:

[M3This]

Info From Riss on the Development:

Originally Posted by Anthony@RissRacing

Ok guys we made some great progress today. I will describe the pics below so you can see in detail the way this stuff is done

Now that we have the downpipe off what we are doing is getting all the measurements for the flanges, piping, etc...

We will need to custom make the turbo flange out of a block of 304 stainless similar too the way we do on the N54. The flange size OEM is 2.75" Putting a 3 inch universal flange on this would be a lot easier & cheaper. However we do not cut corners on design. Since going from 2.75" OEM turbo flange too a 3" universal exhaust flange will cause an imperfection in the exhaust flow.

Now the second part of the OEM DP is there is a smashed section shown in the pics below of two crush points limiting the flow to a little over 2". At the end of the DP it is swedged from a little over 2" to 3" This is so it can mate up too the OEM V-Band clamp. We should have the flange finished tomorrow as you can see we have all the specs set on the Mill today

I will provide all the DP photos + Flange photos below and continue too the 02 Simulator fix we are making on the next post.

[M3This]

Update on downpipe development and O2 Sim:

Originally Posted by Anthony@RissRacing

Hello everybody!

Ok so here is the progress through today. I will start with the 02 SIM. This is a decent amount of work. We are looking at both mechanical fixes as well as the SIM fix similar too the N54. To give you an idea of how we go about this...

On a stock car the signal varies between 0.X to 0.X volts. (replacing x with actual numbers for obvious reasons) However once the test pipes are installed the range increases too 0.X - o.X. This extra swing is what induces the catalyst inefficiency limp/code. The 02 SIM reduces the voltage swing back down to stock levels. Done by a voltage divider. (insight on explaining the issue from Shiv @ Vishnu)

THE VOLTAGE DIVIDER:

Basically a voltage divider is created by putting two electrical impedances in series or in our case resistors. It works by reducing voltage at a fixed %. By using Ohm's law we can determine the approximate % based on the resistors that we use.

Unlike BMW we are most likely not going to accomplish this through a pin out version. We will be taping the simulator wires. Where we have left off is we are getting readings from the OEM downpipe then after we finish our downpipe and run the testing we will be able to do the math to determine the fix

and

Originally Posted by Anthony@RissRacing

Ok as for the downpipe we were tied up with another project on our tooling so we didn't get a ton accomplished. We did however finalize our measurements & and had the mock up done for the custom flange. We decided to go with 2.75" downpipe to flow exactly with the 2.75" turbo outlet. This will have the best possible flow with no tapers or increases in the exhaust piping. Below are some pics of the process. Depth mic on the turbo to check exact clearance. Measuring angle to get the cleanest bend off the OEM turbo. Once the flange is fully complete. We can cut the pipe tack it together. Swedge the end, and put the 02 bungs in. Were hoping to have it fully finished by tomorrow or mid day Friday. Thanks!

[M3This]

Catless DP stuff:

Originally Posted by Anthony@RissRacing

Moving on too the Catted downpipes. We finished the cat up. It is a high flow metallic cat. We are working on the piping, and also finished the the end piece. All we need to do is tac it up and add the bungs should be finished by tonight/tomorrow

As for the 02 SIM we have one together. We just need to test it when we finish all of this up with milage testing. If anybody is in the so cal area that would want a catless downpipe + 02 SIM let us know via PM maybe we can run the testing on your car since we have Kris's car stripped down.

[M3This]

Here are the production units:

Catless Polished:











Catless Heat Coated:

[M3This]

Catted Production Units:







Heat Coated Catted:

[M3This]

Now that I got you guys caught up I Will post some updates when the exhaust is done

[D-MAN]

Looks good!

[R99]

What kind of cost would we be looking at for a catted unit to be supplied in the UK?

[M3This]

Originally Posted by R99

What kind of cost would we be looking at for a catted unit to be supplied in the UK?

Not sure ... I dont want to advertise costs as Riss isnt a vendor on here and I didnt want to get my thread deleted.