Dyno results: FAST 78 vs FAST 90 on a 408 stroker
03-18-2006, 07:32 PM
#1
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Dyno results: FAST 78 vs FAST 90 on a 408 stroker Okay, both tests were done on the exact same Superflow dyno. The tests were done on different days.
We got the car at 12.6 A/F ratio with the FAST 90 and NW throttle body, which was extremely close to the 12.5 of the FAST 78 and BBK 80MM throttle body.
The disappointing part - the car only picked up 4 peak wheel HP between the FAST 78 setup and FAST 90 setup.
The good side - We overlayed the two graphs, and that is where the 90MM setup really proved its worth. The power curve was MUCH broader. It had an average gain of 15.89 RWHP over the 78MM setup at any given RPM. The area under the curve grew pretty substantially. It also made peak HP sooner
FAST 90MM final numbers:
STP corrected
526 RWHP and 475 RWTQ
DynoJet corrected
556 RWHP and 500 RWTQ
FAST 78MM final numbers:
STP corrected
522 RWHP unknown RWTQ
No DJ corrected numbers available
After seeing the overlayed graphs, I am happy with the results. Just looking at peak HP will disgust some people, but power under the curve is what you want, and this definitely made a huge improvement there.
My mods are in my sig, so you be the judges as to the worth of the swap. I can always go with a larger cam
FAST 78 graph
FAST 90 graph
We got the car at 12.6 A/F ratio with the FAST 90 and NW throttle body, which was extremely close to the 12.5 of the FAST 78 and BBK 80MM throttle body.
The disappointing part - the car only picked up 4 peak wheel HP between the FAST 78 setup and FAST 90 setup.
The good side - We overlayed the two graphs, and that is where the 90MM setup really proved its worth. The power curve was MUCH broader. It had an average gain of 15.89 RWHP over the 78MM setup at any given RPM. The area under the curve grew pretty substantially. It also made peak HP sooner
FAST 90MM final numbers:
STP corrected
526 RWHP and 475 RWTQ
DynoJet corrected
556 RWHP and 500 RWTQ
FAST 78MM final numbers:
STP corrected
522 RWHP unknown RWTQ
No DJ corrected numbers available
After seeing the overlayed graphs, I am happy with the results. Just looking at peak HP will disgust some people, but power under the curve is what you want, and this definitely made a huge improvement there.
My mods are in my sig, so you be the judges as to the worth of the swap. I can always go with a larger cam
FAST 78 graph
FAST 90 graph
Last edited by dragonZ28; 03-18-2006 at 10:17 PM.
03-18-2006, 08:40 PM
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Originally Posted by SlickVert
Nice gains with the 90!
Are they out of the box or ported?
Are they out of the box or ported?
03-18-2006, 08:59 PM
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Here is a vehicle speed comparison of RWHP
Speed-----FAST 78-----FAST 90-----gain
50 ----- 125 ----- 152 ----- 27
60 ----- 174 ----- 195 ----- 21
70 ----- 268 ----- 277 ----- 9
80 ----- 325 ----- 345 ----- 20
90 ----- 392 ----- 409 ----- 17
100 ----- 450 ----- 472 ----- 22
110 ----- 493 ----- 510 ----- 17
120 ----- 518 ----- 523 ----- 5
130 ----- 515 ----- 520 ----- 5
PEAK RWHP with 78 occured at about 126 mph
PEAK RWHP with 90 occured at about 124 mph
Average increase under the curve : 15.89 RWHP
NICE GAINS UNDER THE CURVE - ESPECIALLY DOWN LOW
Speed-----FAST 78-----FAST 90-----gain
50 ----- 125 ----- 152 ----- 27
60 ----- 174 ----- 195 ----- 21
70 ----- 268 ----- 277 ----- 9
80 ----- 325 ----- 345 ----- 20
90 ----- 392 ----- 409 ----- 17
100 ----- 450 ----- 472 ----- 22
110 ----- 493 ----- 510 ----- 17
120 ----- 518 ----- 523 ----- 5
130 ----- 515 ----- 520 ----- 5
PEAK RWHP with 78 occured at about 126 mph
PEAK RWHP with 90 occured at about 124 mph
Average increase under the curve : 15.89 RWHP
NICE GAINS UNDER THE CURVE - ESPECIALLY DOWN LOW
Last edited by dragonZ28; 03-18-2006 at 09:05 PM.
03-18-2006, 10:22 PM
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Originally Posted by dame
very nice info..... thank you.
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03-21-2006, 08:49 PM
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pretty much the same type results I got a few years ago testing them on my 383. 78-90 picked up very little peak, but it picked up close to 40rwtq down low 
