|
|
|
|
| Author |
|
|
Registered
|
CO level at 2500 rpms. Does it change when . . .
its under load? I have to smog my 78SC in California. I have a Gastester and am able to get the idle CO level down to .50 (with the air pump attached). But when I run the motor at 2500 rpms, I am about 140, which is above the max CO level of 136. This is just holding the throttle down, not under load.
Will the CO level be lower when the car is run under load? (The smog nazis use a dynometer, rolling drums, to simulate 15 and 25 mph.) I want to set the limits comfortably low. Thanks in advance.
__________________
.. |
||
08-04-2002, 02:00 PM
|
|
|
Guest
Posts: n/a
|
Are you sure the test is done under load? I just had my '82 SC smogged in California, in preparation to sell it, and they did the test without a load @ 2500 rpm. By the way, if you have some doubt about whether it will pass, most smog stations will do a pretest for the same amount as the real test, they just don't hook up to Sacramento. This is what I did, and because it looked like it would pass, we did the real test immediately...I passed!!
Good Luck! -CKKrause |
||
|
08-04-2002, 03:23 PM
|
|
|
Registered
|
Yea, I have to go to a test only station. Randum selection my @ss! I believe the measure it at 15mph and 25mph. I did get it down to 1.00 at 2500 rpms. But I am still wondering whether under laod this will rise or decline. I do plan on having a pretest and I am going to a shop that has been "recomended."
After this years my SC will be 25 years old so I am going for the Historic Plate, and well see what happens.
__________________
.. |
||
|
08-04-2002, 04:03 PM
|
|
|
Senior Member
Join Date: Jan 2001
Location: Left Coast, Canada
Posts: 4,572
|
Meow!
Just a thought, Paul.....
If things get dicey, could you slap on a cat for the test?
__________________
'81 SC Coupe "Blue Bomber" "Keep your eyes on the road, and your hands upon the wheel."- J.D.M. |
||
|
08-04-2002, 04:15 PM
|
|
|
Registered
|
Doug, I switched out the 78 exhaust for the pre-74 a few years ago. In fact I bought the car from a dealer and the car had a cat by-pass tube! I had it smogged by "his guy" in the past but its not an option b/c the state has ent be to a test only station.
To slap on a cat would involve a complete exhaust R7R, w/ oil lines, and the purchase of a cat! But thanks for the thought. Long live the SCWDP
__________________
.. |
||
|
08-04-2002, 04:22 PM
|
|
|
Senior Member
Join Date: Jan 2001
Location: Left Coast, Canada
Posts: 4,572
|
Well, it was worth a shot.
Your actual scenario is why I'm reluctant to go the SSI/pre-74 route. Right now, my 3.0 is passing smog with *no* cat. The rules here allow '81 and older to have a "missing" cat in the visual test. Mine is really missing....haven't seen her in a couple of years! But what worries me, is if the smog nazis suddenly decide to "upgrade" the rules/standards. Then I'd have to refit everything to pass. I'm thinking the pre-'74 performance advantage may not be worth the yearly hassle, if that happened. Good luck!
__________________
'81 SC Coupe "Blue Bomber" "Keep your eyes on the road, and your hands upon the wheel."- J.D.M. |
||
|
08-04-2002, 04:29 PM
|
|
|
|
Registered
Join Date: Mar 2002
Location: Houston
Posts: 1,075
|
I haven't really followed this thread, so this may be unrelated.
The CO will drop dramatically by making your fuel mixture leaner. However, this will increase your NOx and if you take it too far it will also increase your unburnt hydrocarbons. I am only repeating what I see in the Bosch Fuel Injection Systems book.
__________________
Stopped racing and became a drummer |
||
|
08-04-2002, 07:33 PM
|
|
1978 Porsche SC Targa 3.6
