adjusting copot..

[Flavourless]

when adjusting the copot how far can you adjust it, or how far can you adjust it safely?

right now my co pot reads 508 ohms

and lesser amount of ohms is leaner correct?

[mrkrad]

higher the ohms the leaner it gets. i found stage 4 G60 at 800 ohms to run about 13.5-14:1 across powerband until about 13psi where they go static.

this would be bad.

your range is probably 200-1800ohms, it has no effect around 12-13psi.

[Flavourless]

aight thanks sam..ya the car is running super rich plugs are pretty dark at 500 ohms...the car has the stage 5 chip, 2.0L bottom end, 68mm pulley, 30# injectors, front mount and 268 cam

[TBT-Syncro]

co pot tuning will give you a max tuning range of 2% fueling on boost, and 5% off boost.

[Montana Green]

Quote, originally posted by TBT-PassatG60 »

co pot tuning will give you a max tuning range of 2% fueling on boost, and 5% off boost.

2% and 5% of what?

[LagunaSecaBlueMK3]

can the co-pot be on the wrong way?

[TBT-Syncro]

Quote, originally posted by Montana Green »

2% and 5% of what?

+/- 2% fuel, or +/- 5% fuel.

[Montana Green]

Sorry I still don't understand, I'm a little slow I guess. A percentage is just an obscure number to me unless it is referenced to something. If I handed you 2% of Pepsi it won't mean anything to you unless I tell you that I gave you 2% of a 2L bottle, or 2% of the amount I drank last night or 2% of the sugar that is in it or 2% of what the company produced last year.... you know what I mean? What is that 2% and 5% in reference to?

[TBT-Syncro]

I'm assuming you haven't read this rest of the thread. We're talking about trimming or adding fuel. So if we're trimming 2% of the fuel, the system is now only recieving 98% of the fuel it was previously seeing. That amount of fuel does not matter, as its inconsequential to what we're talking about.

its a fuel scaler. So its scaling a percentage of the fuel that would have normally been alloted.

So if you would have normally gotten X, you would now only get 98%of X if it's removing 2%....

[Montana Green]

Quote, originally posted by TBT-PassatG60 »

I'm assuming you haven't read this rest of the thread.

Actually I read the entire thread, otherwise I wouldn't have made it as far as your post. My appologies for seeking clarifcation. Thanks for the response, maybe next time you can do it with -5% of the attitude.

[TBT-Syncro]

Quote, originally posted by Montana Green »

maybe next time you can do it with -5% of the attitude.

probably not.

[KeithMac]

I`ve read +- 20% at idle, +-10% at part thottle and not change at WOT from the VW technical booklet?

[mrkrad]

well i've posted the graph a few times. it will do about not much at closed loop since the o2 sensor will refocus the air fuel anyways. most of the change is off boost, sweeping down to 0% change at about 12psi+.

[KeithMac]

I`ve noticed it doesn`t affect the the closed loop running as well. for me it just affects the warm up cycle, until the oil hits 80 deg c.

How do you change the fueling at part thottle? would a higher rate FPR alter this at all or would the ecu just trim it back to std? Mine seems quite lean when it hits closed loop temps. (BBM chip, 3bar FPR stock G60 greens, running n/a on 16v 1.8)

[sciroccoR]

copot. is that like carbon monoxide potentiometer? are we talking about the sensor that's on the boost tube after the intercooler? if so, i was under the distinct impression that that was a air temp monitor...you know for measuring air density together with manifold pressure should give something that will allow us to adjust fuel amount. if i am nutty, let me know. (i mean about this stuff)

[mrkrad]

it serves two purposes in one device.

Co% fuel adjustment & Air Intake Temp sensor for determining the mass of air with pressure (speed density).

Just because they are together, doesn't mean much, other than they are siamese twins lol.

The ecu can trim the **** out of the a/f as it sees the o2 sensor feedback, if you honestly believe its running lean throw it on a 5 gas analyzer and see how high the noX is and co%. But yeah a 3.5-5.0bar fpr might not be a horrible way to adjust a n/a motor car. They make adjustable fpr's too somewhere.

Grab a few cheap digifant FPR's and squish them. 3.5,4.0,4.5 That should be fine without boost, the ecu is smart enough to trim the fuel back to some degree.



Modified by mrkrad at 6:15 PM 3-5-2005

[KeithMac]

I`ve banged the adjustable FPR on and had a play, dives much better at 4 bar but still lean on the AFR guage between 3 to 4k rpm?

Also been told these gauges are useless with a charged engine, so I`ll be in the same boat when the charger`s fitted an I have to go back to the stock bosch FPR..

[germanengineering g60]

uuuummm, How and where do i drill my copot on corrado g60?

[mrkrad]

uuuummm, How and where do i drill my copot on corrado g60?

the big metal slug. the adjustment is at the bottom of the tube. i just use some dykes or a buck knife and whittle away until the slug comes out

[jeffKautz]

I have a 92 corrado i have my copot set at 425. whent to smog they said its runnin to lean. so i hope this solves the problem. i just rebuilt the motor and charger. new cat.U guys think this will solve. i hear u can run a mustang o2 is that true.

[kerobert]

I run a stage 4 charger chipped with SNS stage 4, stock CAT, Co-POT set at 450 and I fly through our British Columbia Air Care Joke of a system.

[bbwhaling]

got any pics of the copot and how to adjust it

[jeffKautz]

cool thanks bro im goin to try and smog. im gettin the o2 today and hopfully it works

[g60301]

Bump, how do you adjust it? Im running a 3.5 fpr,30lb injectors, stg4 bbm eprom, what should I set it to? I think its been tampered with from p.o. because theres 2 little holes drilled in it.

[g60301]

Bump on this, im still a little confused about it. I pulled my slug out and tested it at idle. It was at 590 ohms I brought it back down to 500 ohms. How do I figure out what to set it exactly? Is 500 ohms safe? My specs are in the post right above this post. Help I dont want to burn valves or pistons up running to lean!

[yip]

Bump on this, im still a little confused about it. I pulled my slug out and tested it at idle. It was at 590 ohms I brought it back down to 500 ohms. How do I figure out what to set it exactly? Is 500 ohms safe? My specs are in the post right above this post. Help I dont want to burn valves or pistons up running to lean!

Set it between 450-500 ohms with the car off/cold.

It really only makes much of a difference at idle or part throttle.

Best to hook up a wide band.

You can set it lower if you want to run richer but again it only really effects the car at part throttle.

Are you having other issues with how your car is running?

[g60301]

Set it between 450-500 ohms with the car off/cold.

It really only makes much of a difference at idle or part throttle.

Best to hook up a wide band.

You can set it lower if you want to run richer but again it only really effects the car at part throttle.

Are you having other issues with how your car is running?

No Actually when I lowered it to 500 from 590 idle really smoothed out and dropped to correct idle, its at 8 to 9 hundred rpms at idle. I need a wideband but cant afford it now

[crazynorweegian]

No Actually when I lowered it to 500 from 590 idle really smoothed out and dropped to correct idle, its at 8 to 9 hundred rpms at idle. I need a wideband but cant afford it now

Wideband is like $170. You can't afford NOT to get it. 500 is a nice stock setting. Try a little less though. The rumor is a little less can make a better low RPM range performance. IIRC, the the Bentley has a range listed in it. It is either 350-550, or 450-550. I put mine at the low end but saw little difference.