Edge Tune w/ Dual Exhaust for the weekend

dixiedesign · #1 08-06-2008, 08:50 AM

Hey folks, just a quick question. I'm heading on a road trip this weekend, just got my high flow cats & true duals. I'm going to send my Edge off for the Gryphon update, spoke to Bill and Corey and they suggested I wait until I was done with my exhaust stuff. So anyway, I'm going to get a gryphon, but for this weekend's trip, do you think I should adjust my "custom program" to compensate for anything? My exhaust guy suggested that I advance the timing by 2, but wanted to get ya'lls thoughts and opinions. Thanks!

dixiedesign · #2 08-06-2008, 10:11 AM

Ok, I said weekend, but I'm leaving tomorrow morning, lol.

**Bluejay** · #3 08-06-2008, 10:27 AM

I really know very little about how your mods to the cats will affect things. However, I have a fear of running lean with this engine, especially the 2004s. What level will you be running and and what octane? If you are running level 2 with 87, no way I would advance the timing any at all. I guess the big question is, do the high flow cats cause an engine to run leaner? If they do, then you would even need to retard timing a little.

**JackandJanet** · #4 08-06-2008, 10:32 AM

That's a BIG change in timing and I wouldn't do it. I think it will cause detonation.

I can't see why you'd adjust timing at all for exhaust mods. Perhaps someone could tell me what I'm missing here (if, I am missing anything). Don't the mods you have just improve the "scavenging" of burned gasses from the cylinders once the exhaust valves open?

If you are using 91 octane gas, load Level 3, which will automatically add timing. And, if you use 93 octane gas, then you could bump the timing up in level 3. You could also increase the timing if you use 89 octane gas and are using either of the 87 octane tunes.

- Jack

dixiedesign · #5 08-06-2008, 10:37 AM

Thanks for the responses, I reckon I'll just leave it as is for the weekend and send it off for the Gryphon upgrade when I get back. Or I might drive up there and visit Bill and Corey. I'm running 87 and Level 2, seems to be running GREAT since the install, in fact it feels like the top of the power curve really puts me back in the seat. Probably going to test my 1/4 and 0-60 tonight. On a closed course, of course.

openclasspro#11 · #6 08-06-2008, 12:19 PM

if he gave advice like that-i sure as hell wouldn't have him do my exhaust,on what merit does he make that suggestion?

dixiedesign · #7 08-06-2008, 01:19 PM

Quote:

Originally Posted by openclasspro#11

what merit does he make that suggestion?

I am not his keeper. No need to get snide.

openclasspro#11 · #8 08-06-2008, 01:33 PM

sorry if my comment was taken as a snide remark-i'd like to know how an exhaust guy would know to suggest something that could be detrimental to an engine-now if he was a tuner- i never would have commented-just looking out for the best interest of your ride

i.ride.suzuki · #9 08-06-2008, 02:47 PM

Quote:

Originally Posted by JackandJanet

I can't see why you'd adjust timing at all for exhaust mods. Perhaps someone could tell me what I'm missing here (if, I am missing anything). Don't the mods you have just improve the "scavenging" of burned gasses from the cylinders once the exhaust valves open?

Exhaust is actually very important. You have one main goal: To get the exhaust to atmospheric pressure. The length, diameter, etc... all come into play. So when guys do these out-the-back dual exit exhaust it serves no purpose of having ~20 feet of exhaust tubing, when the shorter the length, the more TQ at lower RPMs. Yeah there is a lot more... I am too lazy to type today!

**JackandJanet** · #10 08-06-2008, 04:33 PM

Quote:

Originally Posted by i.ride.suzuki

Exhaust is actually very important. You have one main goal: To get the exhaust to atmospheric pressure. The length, diameter, etc... all come into play. So when guys do these out-the-back dual exit exhaust it serves no purpose of having ~20 feet of exhaust tubing, when the shorter the length, the more TQ at lower RPMs. Yeah there is a lot more... I am too lazy to type today!

I didn't say it was unimportant, did I? And, I thought I implied the same thing you are saying by refering to the removal of combustion gasses. Clearly you lose power if the engine is having to "work" to force the exhaust out. And, if you don't "clear" the cylinder, you are not able to add as much fresh air and fuel.

Or maybe you are saying the mods are actually going to hurt performance because the exhaust tubing length has been increased? But don't true duals and high flow cats reduce backpressure?

At any rate, I could not see how changing the exhaust should call for an increase in timing.

- Jack

i.ride.suzuki · #11 08-06-2008, 05:01 PM

Quote:

Originally Posted by JackandJanet

I didn't say it was unimportant, did I? And, I thought I implied the same thing you are saying by refering to the removal of combustion gasses. Clearly you lose power if the engine is having to "work" to force the exhaust out. And, if you don't "clear" the cylinder, you are not able to add as much fresh air and fuel.

Or maybe you are saying the mods are actually going to hurt performance because the exhaust tubing length has been increased? But don't true duals and high flow cats reduce backpressure?

At any rate, I could not see how changing the exhaust should call for an increase in timing.

- Jack

Exhaust has a direct relationship with VE (load), all spark tables are set-up on VE. But i agree, you just shouldn't increase timing without monitoring it first.