Post your dyno numbers and mods thread!
Race Director
Joined: Jun 2000
Posts: 10,046
Likes: 675
From: FL
Chassis dyno when EFI was tuned.
496 Big block with custom 3x2 EFI running FAST XFI 2.05, 10:1 compression, cam in the 240 @ .050" range, Airwolf (ported Edelbrock RPM) heads
T-56 manual (close ratio)
3.73 12 bolt rear
Tuner said that the sidepipes with STS baffles were choking the car above 5500 rpm. I think the heads might be a bit too big as well put the intake was custom made/ported for the heads so swapping heads would require intake rework. So, for now, I just drive the heck out of it.
Instructor
Joined: Feb 2016
Posts: 215
Likes: 26
From: Bismarck North Dakota
crower solid roller 288R 112° advertised 288° 290° at .050 250° 252° lift .570" .584"
victor jr intake
qft 850
Last edited by Knerf; Jun 27, 2018 at 02:00 PM. Reason: added image
Le Mans Master
Joined: May 2006
Posts: 9,993
Likes: 1,136
From: League City Tx
Chassis dyno when EFI was tuned.
496 Big block with custom 3x2 EFI running FAST XFI 2.05, 10:1 compression, cam in the 240 @ .050" range, Airwolf (ported Edelbrock RPM) heads
T-56 manual (close ratio)
3.73 12 bolt rear
Tuner said that the sidepipes with STS baffles were choking the car above 5500 rpm. I think the heads might be a bit too big as well put the intake was custom made/ported for the heads so swapping heads would require intake rework. So, for now, I just drive the heck out of it.
Those side pipes are killing it for sure... There is 40-50hp right there... I wouldn't worry about the heads being too big.
Also, SuperFlow dynos read a bit lower then dyno jets...8-10% lower similar to a Mustang Dyno.... I also dynoed on a SF dyno and I was surprised how low my RWHP was compared to my crank HP...
Race Director
Joined: Jun 2000
Posts: 10,046
Likes: 675
From: FL
Those side pipes are killing it for sure... There is 40-50hp right there... I wouldn't worry about the heads being too big.
Also, SuperFlow dynos read a bit lower then dyno jets...8-10% lower similar to a Mustang Dyno.... I also dynoed on a SF dyno and I was surprised how low my RWHP was compared to my crank HP...
Also, SuperFlow dynos read a bit lower then dyno jets...8-10% lower similar to a Mustang Dyno.... I also dynoed on a SF dyno and I was surprised how low my RWHP was compared to my crank HP...
.I am running STS baffles. I may pull them over the summer and cut off the center cap to improve flow. However, the car is very mellow to drive with the top down at cruise and I don't want to lose that character.
Le Mans Master
Joined: May 2006
Posts: 9,993
Likes: 1,136
From: League City Tx
On my Dad's 65' 396 car, we built some custom, stock appearing side pipes using Classic Chambered crimped mufflers with 2.5" ID.... It woke the car up a lot over the stock midyear side pipes but....it is pretty damn loud now while accelerating..... Sounds similar to the stock pipe sound, with the volume up to 10. Luckily I'm going deaf in it so I get used to it...
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