This is topic Mass Air VS Speed density in forum Drag Racing at Northern California Ford Owners  .


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Posted by KCmustangboy (Member # 1927) on :
 
Well I set it up today and everything seems to work on both sides just fine. I will be bringing both systems to Test and Tune tomarrow night. I have very few bolts ons so its pretty much stock. I am going to just leave it in drive off the line for 2 or 3 passes with each system. Which is faster? We should have a solid anwser tomarrow night! See you guys there. Casey
 
Posted by KCmustangboy (Member # 1927) on :
 
Anyone have a digital camera that will be out at test and tune tomarrow?
 
Posted by Yellow94GT (Member # 431) on :
 
I'll have a digi there tonight Casey
 
Posted by shade-tree (Member # 298) on :
 
I've always been under the impression that stock for stock, the speed density cars ran harder but that was mostly due to a better cam in '87-88 cars and one less intake restriction (the MAF), on an equally tuned stocker though, (same A/F ratio), I doubt you'd notice even a couple hundredths from your new-found intake restriction. But in otherwords I expect you to slow up ever so slightly, given equal air/fuel and timing and the rest of the tune.
 
Posted by season'd 88 (Member # 169) on :
 
quote:
Originally posted by shade-tree:
I've always been under the impression that stock for stock, the speed density cars ran harder but that was mostly due to a better cam in '87-88 cars and one less intake restriction (the MAF), on an equally tuned stocker though, (same A/F ratio), I doubt you'd notice even a couple hundredths from your new-found intake restriction. But in otherwords I expect you to slow up ever so slightly, given equal air/fuel and timing and the rest of the tune.
thats exactly what i was gonna say.
 
Posted by st5150 (Member # 51) on :
 
Exactly what I was going to say as well [Big Grin]
 
Posted by Black94 5.0 (Member # 655) on :
 
I say that the MAF will be a couple of a tenths slower than the Speed Density... [Wink]
 
Posted by KCmustangboy (Member # 1927) on :
 
After driving with both systems for two days I am going to go with this "guess" Mass air will be right there all the way but in the last 400 feet the SD will will by 1 mph, due to the lack of restriction... But who knows...Find out in a few hours! See you all there tonight!
 
Posted by Chris M. (Member # 1708) on :
 
if sized properly the maf shouldn't be a restriction. neither is faster or slower.
 
Posted by KCmustangboy (Member # 1927) on :
 
[worship] SPEED DENSITY!!! [worship]
3 tenths were gained on 6 runs back to back to back without the mass air.
 
Posted by st5150 (Member # 51) on :
 
Cool. What was your best MPH with the MAF and with the SD setup?
What was your best of the night?
 
Posted by KCmustangboy (Member # 1927) on :
 
14.53 @ 96 Best of the night Speed Density (I shuffled it from second to 3rd.
The following were just sitting in drive
15.04 @ 92.0 Mass air best
14.69 @ 94.1 Speed Density best
 
Posted by Black94 5.0 (Member # 655) on :
 
quote:
Originally posted by KCmustangboy:
[worship] SPEED DENSITY!!! [worship]
3 tenths were gained on 6 runs back to back to back without the mass air.
I TOLD YOU!!!.......I switched my 86 to MAF and it slowed my car down too....

Oh well, atleast you know which one is better with your current set up.... [patriot]
 
Posted by KCmustangboy (Member # 1927) on :
 
Key word there being CURRENT, however I am swapping my AOD for my T5 today, so I am thinking I need to do the mass air swap anyways, I don't think the AOD computer will work well with a T5 computer, sense the T5 is mass air I guess I have to hook it all up!
 
Posted by shade-tree (Member # 298) on :
 
now wait a second--- the MAF swap is a computer, harness, the MAF ,etc., you swapped back/forth completely between speed density and mass air several times between runs? side by side computers? or?
 
Posted by st5150 (Member # 51) on :
 
I'm running an AOD computer with my T5 for a few years and 60,000+ miles just fine [patriot]
 
Posted by KCmustangboy (Member # 1927) on :
 
quote:
Originally posted by shade-tree:
now wait a second--- the MAF swap is a computer, harness, the MAF ,etc., you swapped back/forth completely between speed density and mass air several times between runs? side by side computers? or?
Yes sir I sure did, computer, wiring and the whole intake tube, takes about 10 minutes to do IF SETUP to do it. think about it...side by side computers...wiring already ran just waiting to be pluged it to mass air, and then swapping intakes. How long does it take you to unplug the EEC and hook up another one and then swap intakes?
 
Posted by KCmustangboy (Member # 1927) on :
 
quote:
Originally posted by st5150:
I'm running an AOD computer with my T5 for a few years and 60,000+ miles just fine [patriot]
I am not for sure but I believe the AOD computer starts pulling timing out in the higher RPMs.
 
Posted by Chris M. (Member # 1708) on :
 
what was the a/f on the maf and sd runs compared to eachother, also what do the timing maps look like?
 
Posted by st5150 (Member # 51) on :
 
quote:
Originally posted by KCmustangboy:
quote:
Originally posted by st5150:
I'm running an AOD computer with my T5 for a few years and 60,000+ miles just fine [patriot]
I am not for sure but I believe the AOD computer starts pulling timing out in the higher RPMs.
Not true. Actually the AOD EEC adds a tad more part throttle advance so you may notice a bit better part throttle response with the AOD EEC. The AOD EEC is also a bit slower in bringing the RPM's down with the car out of gear, but you won't notice this unless you compare side by side. Use the AOD EEC [patriot]
 
Posted by KCmustangboy (Member # 1927) on :
 
Thanks! I will try the AOD one then. at least until i add mass air
 




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