Speed Density, Dry Shot
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Originally Posted by Sport Side
I just love a dry shot + MAF because of the seperate timing/fueling on one tune.
If I could figure a way to do that now....
If I could figure a way to do that now....
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Originally Posted by BigKID
How are you determining the afr? That is the only down fall I see. It would be way easy to lean out of you dont have a wideband to constently monitor the afr.
The MVolt targets do not even come close...
The PE Mult formula (14.7/PE=AFR) is completely off, even with inline trims.
That is exactly how I had mine setup. Fortunately my high N/A maf readings didn't overlap my low N2O maf readings so I could tune seperate fueling and timing for each.
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Plenty of gap to set 2 different timing curves seeing as I'm at .76 all-motor.
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I did have to move teh MAF farther upstream in the intake track to get it to read the nitorus correctly without freezing
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What jets are you running? I froze mine also with a AEM filter, which is about twice as long as that one, but I had a "jet error", which equated out to a 150 shot. With the 100 shot it was fine, and pushed my slow as pig to a 13.43 from a best of 14.5x off the spray. I ran great like that. I think that air filter is just too short. I also had a NOS brand fogger "Fan Nozzle", so I'm not sure what type or style of nozzle you are running. I'm not sure I'd run that DRY without a MAF, tuned or not.
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Originally Posted by BADMOFO
What jets are you running? I froze mine also with a AEM filter, which is about twice as long as that one, but I had a "jet error", which equated out to a 150 shot. With the 100 shot it was fine, and pushed my slow as pig to a 13.43 from a best of 14.5x off the spray. I ran great like that. I think that air filter is just too short. I also had a NOS brand fogger "Fan Nozzle", so I'm not sure what type or style of nozzle you are running.
I'm not sure I'd run that DRY without a MAF, tuned or not
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I understand that you have a wideband, but are you able to monitor it the entire run? Also, are you using a window switch, a button, throttle accuated switch? Just wondering if you are spraying all the way thru or what. I would expect it would be "loaded up" after the burnout while staged as well. I don't know, I liked my dry shot with the MAF and had great results with it, but just wouldn't feel safe without it. I understand the the MAF is basically reading the air and relaying that info to the computer, and you have by passed that step, kinda like a short-cut. It's just something I wouldn't be comfortable with, no matter WHO was tuning it. I'm not doubting your tuning skills, but that was a HUGE gain for only 100 shot, the kind of gain you would see from running lean, on the edge. Then again, I still have all of my Torque Management in, so you can tell I don't "push it". 1 1/2 second drop in E.T. from a .050 jet is HUGE!
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I went from a 14.3 @ 95 to a 12.96 @ 106 spraying thru the MAF and the nitrous was entered at the end of my CAI... The one sitting in the upper left corner of the 2nd picture.
The MAF was pretty messed up after this pass.
Here is a log from the run before.
![](http://memimage.cardomain.net/member_images/4/web/496000-496999/496250_72_full.jpg)
I made 3 passes. Each one, dropping the 60' a tenth and gaining no ET. Probably the MAF but, who is to say? LOL
The MAF wires were pretty bent up. I received an email from a guy who said this is what happens when a frozen wire 'defrosts'. I don't know how true this is but, the wires were definetly bent.
With the new setup, I'm bypassing the MAF altogether and spraying right at the Throttle body. The ZEX cone uses no nozzle so, your basically connecting a line to it with a jet stuck in there.
Oh, and I'm spraying thru the shifts.
The MAF was pretty messed up after this pass.
Here is a log from the run before.
![](http://memimage.cardomain.net/member_images/4/web/496000-496999/496250_72_full.jpg)
I made 3 passes. Each one, dropping the 60' a tenth and gaining no ET. Probably the MAF but, who is to say? LOL
The MAF wires were pretty bent up. I received an email from a guy who said this is what happens when a frozen wire 'defrosts'. I don't know how true this is but, the wires were definetly bent.
With the new setup, I'm bypassing the MAF altogether and spraying right at the Throttle body. The ZEX cone uses no nozzle so, your basically connecting a line to it with a jet stuck in there.
Oh, and I'm spraying thru the shifts.
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The MAF was definetly injured at this point.
Timing, MAF output, O2 readings, and the IDC were all over the place.
Timing, MAF output, O2 readings, and the IDC were all over the place.
Last edited by Sport Side; 03-28-2006 at 09:17 PM. Reason: Better word