These are the mods I was planning. I need to know where I will stand after each of them with my a/f ratio.
I went to the dyno a year ago and I was running a little rich. I haven't done one power mod since..
1. Would porting my MAF and/or getting bigger ends lean me out a little? Which is better and why? SLP 85mm MAF or Home Port? Doesn't the SLP 85mm change the programming on top of the bigger size?
2. I also have the HPP3+ and was thinking about using it for the programming. All that does is make you leaner right? Can it make me too lean with the ported MAF/ENDS?
3. Then I heard Headers make you run rich? Is this true?
4. After the headers I figured a good LS6 intake would lean me out. Yes? No?
5. After all of these mods, would I benefit from a ported TB? I will be getting one for the heads/cam next April anyway so it's no big deal spending the money for the few hp but will it help for now?
6. And since it is winter, I was going to bypass the air conditioner. This is known as the 'short-belt mod' right? How much hp is that good for?
I know that this stuff together won't ad up nearly to what it would seperately because of the restrictive heads and cam not taking advantage of the extra air and fuel but what do you think I would pull after these mods? I pulled 331rwhp and 338rwtq with just a cutout and a lid, even had the stock filter in it with a crappy 2000 LS1 intake. No the dyno wasn't optimistic because others only pulled 306 with same mods on a auto. Thanks alot guys if you find the time to answer (If you even read this far. LOL)

 

I am also interested in this.

 

Ported MAF = lean
Headers = lean
HPP3 programing = lean

Lean 3, Rich 0

I don't think the LS6 intake contributes to rich/lean changes at all. The "crappy" 2000 LS1 intake is about the same as the LS6 if you don't have heads/cam/headers, etc.

<small>[ November 30, 2002, 11:01 PM: Message edited by: Brother J ]</small>

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Brother J:
<strong>Ported MAF = lean
Headers = lean
HPP3 programing = lean

Lean 3, Rich 0

I don't think the LS6 intake contributes to rich/lean changes at all. The "crappy" 2000 LS1 intake is about the same as the LS6 if you don't have heads/cam/headers, etc.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Actually its a rare occasion for headers to make an engine run lean. The majority of the time LT's will cause a car to run pig rich.

 

Actually, headers make most any car run lean, compared with stock manifolds. The PCM just happens to overcorrect for the lean condition on our cars. Put headers on a old school SB Chevy? Gotta fatten up the jetting.

 

The air conditioner is always BYPASSED summer or winter until someone decides to press that little button that says AC. That's when that little guy that lives inside of your AC compressor wakes up and tells that electro-magnetic clutch to energize and load your engine down. Don't screw around with your AC.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Brother J:
<strong>Actually, headers make most any car run lean, compared with stock manifolds. The PCM just happens to overcorrect for the lean condition on our cars. Put headers on a old school SB Chevy? Gotta fatten up the jetting.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">i'm not trying to argue here, cuz i'm goin to put headers on my car in a month so i'm going to have to do some tuning with a MAFT, but when the PCM over corrects for the lean condition the car is running rich isn't it?

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by FstBlkz28:
<strong>[QUOTE]i'm not trying to argue here, cuz i'm goin to put headers on my car in a month so i'm going to have to do some tuning with a MAFT, but when the PCM over corrects for the lean condition the car is running rich isn't it?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Upon further consideration, I should have taken into account the role of the PCM in all of this because regardless of what the headers do, it is ultimately how the PCM reacts that determines the final outcome. Thanks for helping me realize that. <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

 

If the computer controls the air/fuel ratio then how can it allow detonation to happen? Or will it not allow it to happen unless you have done outside tampering with something like the HPP3+ or LS1EDIT? If the computer recognizes a huge lean condition from running the headers and overcorrects for it making it run rich then I should be able to lean it out with my HPP3+ shouldn't I? What I'm wondering is if the HPP3+ takes the computer back to a stock set-up minus any bolt-ons and then leans it out from there or if it only leans it out from where the computer is already set after all of the bolt-ons.

How come some people who do the SLP MAF AND ends sometimes run too lean and the computer doesn't recognize it? Does the computer need to run dangerously lean for it to correct it? And isn't ANY lean that is robbing power dangerously lean?

As far as taking the AC belt off. I think it would help even if you have the AC turned off inside of the car because regardless, it is less drag on the engine. It is the same thing as putting on an underdriven crank pulley. The underdriven pully is smaller in diameter therefore it doesn't take as much to turn it per revolution of the crank. If I am wrong on this whole AC thing then please tell me why and then explain to me what the 'short-belt mod' IS.

 

eallenboggs is 100% correct. Leave the AC alone as it's merely along for the ride until it's activated. The appoximate HP gain from this mod is .00000001. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

In 99% of the cases, the computer will not allow detonation unless outside tampering has occurred (like the HPP+, Predator, or LS1Edit you mentioned). The only case where it would happen is if it cannot adjust the parameters enough to compensate for the conditions.

Keep in mind, there really is no substitute for wideband 02 dyno tuning. We could speculate til the cows come home about which mod will do what to your A/F. But it would be just that; speculation. That said, your computer will try and compensate based on readings from the MAF and 02's (among other things) no matter what mods are done. So headers, for example, will allow more exhaust fumes to travel past the front 02's thereby increasing the overall oxygen content sampled. Initially, it leans out because now the engine can expel more spent gasses and draw in more fresh air for the same amount of fuel. But, when the LTFT's figure out that there's too much oxygen and this isn't just a fluke, the computer will compensate as though the air were simply denser, and richen the mixture up until it's happy (usually around 12.2:1 or whatever your car was from the factory). So you end up with a "pig rich" car that is in serious need of tuning. Minor mods done on the intake side can have a leaning out effect especially if they occur after the MAF. Just unplug a vaccuum hose after the MAF and watch your FT's. They will get lean. The computer will perform some compensation but it's usually not enough to override the entire effect of the new mod. Especially considering the only reading it can take at that point is from the front 02's which are after the combustion process. Anyway, get that car on a dyno once (or while) you add the mods. You'll be much happier knowing your A/F and not guessing at what it might be. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />