Has anyone tried to use the EGR control function to controll other things? I was thinking that the I could use the EGR function use its 5v supply (should be 5v right?) to power a relay for say, an intercooler sprayer or maybe even nitrous. Because you can control the EGR for throttle %, engine temp, change fuel flow due the the egr, and a few other parameters... Is there something Captain Obvious would like to point out that I'm missing? Any holes in the theory? btw, I'm using a 7749 computer, and tunerpro w/ autoprom on a 1990 sunbird turbo 2.0L with tgp turbo and dsm intercooler. Anyone tried anything similiar?

 

the caption obvious response: BE CAREFUL.

if you leave the factory code in place for controlling the egr output, and hook it up to nitrous or something like that, you have to be 110% sure it will NEVER activiate at the inopportune time.

My personal opinion would be to gut every last bit of control the stock code has over the egr output, then write your own, then test it extensively on a bench, then test it some more in the car with a diagnostic LED before you even consider hooking it up to something like nitrous.

Even then, i'm not sure I'd do it.

I don't 100% know what the 749 does, but in the 730, the EGR is pulse width modulated so it's only 5v when you're at 100% duty cycle on the EGR.

 

So in theory it should be able to made work correct... Maybe I'll start with the intercooler sprayer, That should be a fairly simple thing to test even. If it works great... If not then oh, well...

Can't you just set the EGR to 100% duty cycle at 75% throttle opening? I'm still waiting for my autorpom, so I can't hook up yet and see the options.

I'm not real sure on rewriting code yet. I can write in fortran, and some visual basic, but I think I'm going to hold up a little yet before I start re writing in this stuff.

I was hoping to use the stock parameters and bending them slightly to what I want. I was actually leaning towards the inter cooler sprayer, but hinting that someday, someone, not necasarrily me, try the nitrous-- the funding for the intercooler sprayer is a lot closer than the funding for a nitrous set up. And I always thought having a cheap wife was a good thing

 

I'd strongly recommend running it *dry* before spending any time, fab'ing things up.

I hope you mean using a *gaseous* form of cooling. Spraying water or anything else on the road, that you or others can spin on, sounds like a libility nightmare.

 

As far as the water on the inter cooler, I'm hopeing that the nozzles I get are more of a mister type. I'm not sure how familiar you guys are with the turbo sunbirds, but the turbo sits up front, and has a non intercooled line that runs straight up and over the engine to the TB. I have found that a 95+ DSM I/C's fit perfectly above the turbo with the throttle body lined up with the exit. unfortunatly the turbo sits pretty much directly under the I/C. So I would hope that the water that does make it through the intercooler would soon be evaporated by the heat of the turbo, and also I doubt there would be enough volume to make anything slick I'll post some pics of the set up on my profile if anyones really all that interested.

 

No reply's... I thought if nothing else I would get all kinds of people shooting the idea down...

 

Getting the egr sol to work only when you want will be the hard part.
A pressure switch and and an arm switch would be alot easier I'd think for someone of you code knowledge level.
Do a search on $59 WB. The code author might help you out if your 100% ready to test it. His last free code venture resulted in no one admitting to using it. But he doesn't use egr on his car so he might be interested if he has time.

 

Thanks for the info. I'll do some playing around and see what I can make happen.