I'm going to be swapping some AFR heads and a full superram intake along with the super ram cam onto my car in the next month or so and then doing iterative tuning.

I'm interested in knowing if you think I should keep my EGR or block and disable it. If you think I should disable it, what's the best way in-chip to do it? Set the enable threshold to 100% tps?

I guess it depends on your priorities. I removed mine to get rid of the vacuum lines and solenoid that were in the way, and it cleans up the engine a little. I easily passed the IM240 emissions test (the one where the car is driven on rollers) with just a catalytic converter, no EGR, and a 160-degree 'stat.

You'll have slightly lower emissions with the EGR, but a performance cam will have enough self-EGR that it's not needed. You can also run more timing and less fuel on the highway since the exhaust gas dilutes the air/fuel mixture. My car is street-driven as well as raced, but I didn't want the EGR to introduce hot gases into the intake during drag-racing or road-racing. Just MHO...

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Greg Westphal
'87 IROC 355TPI/A4

How'd you disable it in the prom, Greg? Mine is currently inactive because I have the 'vette heads, but I haven't deactivated it in the prom.

I'd suggest setting the temp enable to a high figure.
Then set the flag so as no to even be able to report a failure.

One thing to condiser is that for the IM240 here in San Diego they have to test the EGR. They do that by connecting a vacume pump to the egr & hitting it with vacuum until the car stumbles. that way they know that some smart alec hot rodder did not stick a penny in the hole between the EGR & the manifold. or put the intake gaskets on that does not have the hole in it.

I have it on the car but turned off.

BW

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Bobalos
aka Bob W.
www.r71camaro.homestead.com
r71chevy@earthlink.net
<><

Bruce already mentioned a couple ways to do it, but I just set the %TPS enable to 100% (well, 99.6% is the highest possible) and turned off the diagnostic check.

Luckily, here in Maryland they don't look under the hood, just make sure you have a cat and check the tailpipe emissions.

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Greg Westphal
'87 IROC 355TPI/A4

So consensus is that with the LPE219 cam I won't need EGR, right? Thanks for the input!

Aren't you glad you live in Michigan and don't have to worry about emissions?

The typical way of disabling the EGR is to set the EGR Enable Temperature to 255 counts.

Just every once inna while I had problems doing that, so now I use like FD. YMMV

So, lemme get this right, There is no big deal with disabling the EGR?, Engine runs fine, no special values have to be set to do it other than the following:

I disabled the EGR diagnostic, but since I am using the 6E & Tunercat I only have the following variables concerning EGR,: EGR Off (% TPS) and EGR on (% TPS). where should I set these? I don't know where to find the "EGR Enable Temperature" as mentioned above by Glenn, in Tunercat

any suggestions would help... other than look it up.

Try 0247, looks like it's one of the reverse reading temps. Try 02 as an entry, let me know what ya find.

Err, umm, what? I am lost, what are you talking about???

0247 and 02, I assume you are talking about the Binary, but umm, changing somthing without knowing what it is sounds a llittle strange...

The "EGR Enable Temp Counts" is defined in the SD 7730 8D.TDF. I have defined it within the 6E.TDF. Contact TunerCat and ask for the "6EX" version. I forwarded this to TunerCat a few months ago so they could incorporate it in a future version of 6E.

If you TunerCat has NOT yet defined the parameter in the basic 6E (I would assume they would have by now), just as for 6EX.TDF and they have it defined.

And do as Grumpy suggests and set it to 253 (x'FD). Inside the ecm 255 (x'FF) is occasionally interpreted as -1 instead of 255. In Binary, its called the "Ones compliment" which is used for negative numbers. (Thanks for the "heads up" Bruce).

I have already contacted Tunercat, and they sent tme the 6EX free of charge. The only problem is that he stated that the tables only support up to 50 variables. Since the 6EX has more there is some runtime problems which will be fixed in the next version of Tunercat.

lemme try it again and see if it works

John

So Glenn & Grumpy -

Do I set location 0247 to 02 or FD in the 6E code?

As a side note, I once tried to set all the values in the EGR table to zero - that apparently broke the code & sent me into "limp home" mode - any ideas?

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Gabe

[This message has been edited by 86atc250r (edited July 10, 2001).]

So far it looks like FD did the trick... Need to log & make sure EGR was never activated, but just by watching, I never saw the duty cycle come off of zero...

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Gabe