Plenum/TB Discussion Thread

Red35th said:

Man, the dyno sheet you posted was SEVERELY FLAWED. You claim that 10rwhp was gained, but you neglect to mention that on that run, the a/f dropped from WAY, WAY lean, to only slightly lean. Of course it picked up horsepower. Maybe the plenum gained some of the at 10, but most of it was the a/f change.

Thanks for posting the dyno, but it simply does not indicate that the plenum/tb gained any hp.

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d98gt said:

A timeslip from may vs a time slip from october? I imagine D/A has alot to do with that time slip

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LI98GTStang said:

Didn't know this was a scientific experiement that I was participating in - I was out to have fun. Secondly, it is the same track and from what I remember the temperature was close to the spring runs. It certainly wasn't a cold/cool fall day here in the N.E. that day. I think there is a site that may have temps archived. I do have a bunch of runs both times Winters I can prob. find those too and shifted within 500rpm either way on each shift.

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sneaky98gt said:

DA Calculator - Density Altitude Calculator - DragTimes.com

They have my track and data for a few years anyway. See if they have yours.

-Will

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LI98GTStang said:

Thanks, the site worked. It was actually slightly warmer the 2nd time around so I guess that kills the theory that cooler weather made the car go faster. Could it be that the TB/plenum combo possibly helped?

1st run in May 7th
9:54 AM 61.0 F 30 % 30.28 in
10:54 AM 63.0 F 27 % 30.27 in
11:54 AM 64.0 F 25 % 30.26 in
12:54 PM 64.9 F 27 % 30.23 in
1:54 PM 66.9 F 23 % 30.22 in
2:54 PM 66.9 F 21 % 30.19 in

2nd run in October 16th:
8:54 AM 57.9 F 78 % 30.20 in
9:54 AM 61.0 F 60 % 30.20 in
10:54 AM 64.0 F 54 % 30.19 in
11:54 AM 66.9 F 51 % 30.18 in
12:54 PM 69.1 F 45 % 30.17 in
1:54 PM 70.0 F 46 % 30.14 in
2:54 PM 71.1 F 45 % 30.13 in
3:54 PM 71.1 F 47 % 30.12 in
4:54 PM 71.1 F 45 % 30.12 in

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