Bill S.

My Ruf Turbo R just passed smog in California. Here's what I needed to do:

1. Installed the check engine light (Ruf removes it because it occasionally goes on with the richer mixture).
2. Replaced the clamp on the left hose that connects to the turbo. Ruf provided the clamp for free. The OEM clamp was leaking, causing miss-fire codes.
3. Replaced spark plugs.
4. Replaced the O2 sensor. The heater was burned-out.
5. Drove the car for 20 minutes while not exceeding 60 MPH or 3000 RPM. If you do, you'll need to start all over.
6. Idle the car for 20 minutes. This clears the last codes.

Here's the final smog numbers. How does it compare to your cars?

890 RPM:
%CO2 = 12.5
%02 = 3.1
HC (PPM) = 94 (limit is 100: close!)
CO(%) = 0.17 (limit is 1.00)

2484 RPM:
%CO2 = 14.1
%02 = 0.6
HC (PPM) = 28 (limit is 130)
CO(%) = 0.23 (limit is 1.00)

PramTT

Bill, here are my 993TT numbers from recent test (two separate tests)

798 RPM: 779RPM:
%CO2 = 14.9 %CO2 = 14.9
%02 = 0.0 %02 = 0.0
HC (PPM) = 8 (limit is 100) HC (PPM) = 0 (limit is 100)
CO(%) = 0.01 (limit is 1.00) CO(%) = 0.00 (limit is 1.00)

2434 RPM: 2438 RPM:
%CO2 = 14.9 %CO2 = 15.0
%02 = 0.0 %02 = 0.0
HC (PPM) = 6 (limit is 130) HC (PPM) = 0 (limit is 130)
CO(%) = 0.08 (limit is 1.00) CO(%) = 0.03 (limit is 1.00)


Your Ruf HC number at idle is kinda high

Bill S.

Pram,

Thanks for the numbers. I also thought the HC was too high. I have an email into Ruf to see if that's normal.

It may be with the 5 bar FPR, performance cams, and free-flow cats. The cams alone make the car idle a bit rough.

Bill

Bill S.

Ruf has confirmed that these emissions are normal for a Turbo R. It's due to the new camshafts. Ruf also confirmed that this will not damage their catalytic converter.

Note that I have not seen the CEL illuminate for this. However, Ruf has indicated that it may occasionally light due to the richer mixture. That's why they remove the CEL (which I have replaced).

Although I would have liked to see a cleaner emission test, I suppose it's OK since it's still under the CA limit, although close at idle.

Does anyone have emission results for other tuners like RS, FVD or Andial?

JJayB

Bill, I have no problem passing on my low boost program.
Rpm co2 %o2 HC CO%
785 14.0 1.3 17 .00
2425 14.6 0.4 12 .10

My off road use (track) program, the HC is well over due to the the cam and a lot more fuel. I think the twin plug set up helps on low boost.

BTW, met up with Steve Beddor and his awesome Ruf CTR2 sport. We had a ball at Willow.

Bill S.

Thanks for the numbers Jim. That setting's pretty clean. I'm sure the twin plugs help somewhat.

How did Steve's CTR2 Sport compare with your 3.8? Sounds very exciting! I always wondered about that car.

JJayB

Bill

Steve Beddor is a great guy and a very accomplished driver. His car had some truly innovative things that he develped with Ruf himself. The CTR2 sport weights about 3000lbs and is a fully caged with removable side bars. The car is street legal and he drives it on the street. No air, and light weight door panels and seats.

The body has extended flairs and he was running 11x18 and 13x18 BBS wheels with Michelin slicks. He has boost activatied water spraying on the outboard intercoolers which is very trick. This was his first time at Willow and he was just getting to know the track. I took advantage of my 15 years experience at Willow and got behind him to see where the CTR 2 may had some advantage.

Normally, the 3.8 tt will put several car lengths on just about everything, Lingenfelter 427 ZO6's, Vipers, etc.: out of the corners. Steve was right there. Speed wise, I felt the cars are very close. Steve did say that he has a special gearing and close ratio transmission which really helped his low and mid range. I felt complimented by him saying he couldn't get that black car out of his mirrors. I told him in the next run session, I couldn't get that yellow car out of my mirrors. I developed a brake accumulator problem that prevented more testing. Overall, a great weekend at the track.

TB993tt

Here are the numbers my car gave at the last test:
Rpm 840
CO 0.21%


Rpm 2603
CO 0.14%
HC 17 ppm
Lambda 0.997

These are the only numbers checked on the UK MOT test.
Bill
You report lumpiness at idle and combined with that high HC figure -just what sort of cams are in there
RS Tuning used 993 Carrera RS 3.8 cams timed to stock spec and they are perfectly smooth however I suspect this is largely down to fine tuning on the engine dyno - I don't suppose twin plug affects idle quality ?

Ran

Bill S.,
Here are the numbers from my stock 993TT. The numbers are consistent with results from prior years. Of course, given that the numbers quoted here for your TT as well as that for other TTs represents modified cars, the data from my car with its engine in factory form may not be of much significance. Nevertheless, here it is...

"2500 RPM Emissions test" results:-
RPM 2586
CO% = 0.00 ("standard" is 0.50; not sure if "standard" means the limit or if limit is even higher)
CO2% =14.8 ("standard" is not listed)
HC = 0 ("standard" is 100; not sure if "standard" means limit or if limit is even higher)

It seems that the 993TT runs very clean atleast in stock factory form and so those with modified cars have much "allowance". Mine is staying factory stock but after hearing all the OBD2 software issues, I think that even if one has a clean car, one can have trouble passing due to all the glitches. So far no problems, thankfully.