OK before you look and get wigged out, this should show you more than plenum volume to think about.
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EFI Intake plenum volume
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EFI Intake plenum volume
2007 SBN/A Drag Week Winner & First only SBN/A Car in the 9's Till 2012
First to run in the .90s .80s and .70's in SBN/A
2012 SSBN/A Drag Week Winner First in the 9.60's/ 9.67 @ 139 1.42 60'
2013 SSBN/A Drag Week, Lets quit sand bagging, and let it rip!Tags: None
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Plenum volume and the pressure wave VE should be down.
See the top moving around even with his hand on it thats the pressure waves hitting it.
Also see the reversion coming up the runners
I would change the plenum the rear right has to have issues being that close to the radius of the port2007 SBN/A Drag Week Winner & First only SBN/A Car in the 9's Till 2012
First to run in the .90s .80s and .70's in SBN/A
2012 SSBN/A Drag Week Winner First in the 9.60's/ 9.67 @ 139 1.42 60'
2013 SSBN/A Drag Week, Lets quit sand bagging, and let it rip!
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LOL loads will do that. The long pulls on a dyno I just turn my head and cross my fingers.2007 SBN/A Drag Week Winner & First only SBN/A Car in the 9's Till 2012
First to run in the .90s .80s and .70's in SBN/A
2012 SSBN/A Drag Week Winner First in the 9.60's/ 9.67 @ 139 1.42 60'
2013 SSBN/A Drag Week, Lets quit sand bagging, and let it rip!
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Originally posted by JeffMcKC View PostLOL loads will do that. The long pulls on a dyno I just turn my head and cross my fingers.www.realtuners.com - catch the RealTuners Radio Podcast on Youtube, Facebook, iTunes, and anywhere else podcasts are distributed!
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I was thinking just that as we where talking Scott, the Wheeeewww Factor of ok thats over lets not do it again.
I want a dyno! To abuse my junk on, no car needed2007 SBN/A Drag Week Winner & First only SBN/A Car in the 9's Till 2012
First to run in the .90s .80s and .70's in SBN/A
2012 SSBN/A Drag Week Winner First in the 9.60's/ 9.67 @ 139 1.42 60'
2013 SSBN/A Drag Week, Lets quit sand bagging, and let it rip!
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Originally posted by Matt Cramer View PostToo bad there's no with / without dyno graphs in the video.2007 SBN/A Drag Week Winner & First only SBN/A Car in the 9's Till 2012
First to run in the .90s .80s and .70's in SBN/A
2012 SSBN/A Drag Week Winner First in the 9.60's/ 9.67 @ 139 1.42 60'
2013 SSBN/A Drag Week, Lets quit sand bagging, and let it rip!
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Originally posted by JeffMcKC View PostI agree but would think it would have to be lower, with the top off and Slower to get there too. I look at that as much as anything.
We did lots of work with airbox volume when I was building motorcycles (Same as plenum volume in car language).
Motorcycles have butterflies at each intake runner (even with carbs), and cars typically have them before the air plenum. Probably for simplicity sake, but at WOT it all the same.
Changing Airbox volume and intake runner length were one of the most interesting experiments I have ever done on a dyno.
More airbox/plenum volume from what I saw on my projects was always better through the entire rpm range, but the biggest gains were in the midrange. The trick was finding more volume in the confined space of a motorcycle chassis.
You called it pressure waves and reversions; we called it intake resonance, and found that certain frequencies could actually disrupt power significantly at a certain rpm range.Last edited by mike343sharpstick; April 4, 2012, 10:01 AM.
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Yeah, I have always been told, keep stacking spacers on the Plenum till the power drops on the dyno, then at the track keep taking them off till it slows down.
Mine has a Reversion "Hole" at about 2500 to 2800 then its back on like a light switch. In that range it mixes up cylinders some not a true miss just sounds weird and power drops off. I just use the converter to drive past it.2007 SBN/A Drag Week Winner & First only SBN/A Car in the 9's Till 2012
First to run in the .90s .80s and .70's in SBN/A
2012 SSBN/A Drag Week Winner First in the 9.60's/ 9.67 @ 139 1.42 60'
2013 SSBN/A Drag Week, Lets quit sand bagging, and let it rip!
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Hmmm, reversion hole. I have a similar deal at a similar RPM in street driving. Talking with Scott there may be an interplay between the interpolation function as it edges to next pair of bins on the VE table along with some errant TPS based Accel enrichment. I get a fat miss across some cylinders for a few seconds and I see the the AFR guages dip into the 11's. Much more work to do but I'm generally pleased with the real world drivability given the 4400+ cfm of the dual TB's.
No doubt the high stall converter masks a lot of what would otherwise be annoying stuff at low rpm load with the stick.
We are truly in a wonderful age being able to drive around with these kinds of HP/cu.in. NA and live to tell about it.Drag Week 2006 & 2012 - Winner Street Race Big Block Naturally Aspirated - R/U 2007 Broke DW '05 and Drag Weekend '15 Coincidence?
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