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12-08-2009, 06:59 PM #1
Shelby Super Snake Dyno Comparisons
Muscle Mustangs and Fast Fords Magazine voted the Shelby Super Snake with the KB2.8H one of the "10 Best Cars in 2009".
One of the big mysteries that everyone seems to inquire about is "How does Dynojet HP relate to engine HP "and" Does the Shelby SS really make 725HP? Sure does!
Well we tested our 100% stock Shelby SS w/2.8H on the Dynojet and then tested the motor on an engine dyno. These are the results:
PULLEY RWHP EHP %
3.5" 627 723 86
3.25"* 658* 771* 85
3.00" 692 809 85
2.75" 764 874 87
2.50" 806 914 87
The 85% conversion looks good. It’s the number we use for manual transmission cars. Auto trans is higher depending on whether it is lock up or non-lock up converter.
This tells you that Shelby’s rating of 725HP on their KB 2.8H Super Snake is "CONSERVATIVE". A Shelby SS 2.8H was tested by MM&FF with a 3" pulley and 93 octane. It ran a 10.87/134. Editor Evan Smith said "It takes 800HP to cut these 1/4 mile times". The actual engine dyno says 806HP. Note how accurate engine & chassis dynos vs. drag strip times are IF good accurate test data is used. Yes, the car had sticky tires but that doesn’t change the 1/4 mile speed which is a great indicator of engine HP if you use the right formulas. Kenne Bell once offered our Power Speed Calculator that would give 1/4 mile times if vehicle weight and engine HP was known. It was based on formulas developed by Chrysler engineering in the ‘60's. The more things change the more they stay the same. Also, did you know that launching a car in 1st, 2nd, or 3rd gear will result in the same 134mph trap speed? May be in 13-17 sec. ET range but it will be 134 if there aren’t any big bogs where the car slows or stops. 1/4 Mile MPH is just like a dyno run. The ET is merely a function of traction. That’s also how 2 runs can have the same MPH but different ET’s.
At Kenne Bell we have a saying posted on our dyno that says "One of the real dangers in running a test is you’re bound to get data" We do a lot of testing. The above Engine Dyno vs Chassis Dyno tests are an example. We perform these identical tests for our Hemi and Camaro kits. During this session, I also tested long tube headers vs manifolds at numerous HP levels from 602-914HP (8-23HP) But that’s a different story!
We hope this info is helpful.
12-08-2009, 07:49 PM #2
12-09-2009, 02:31 PM #3
Is that by chance you in the picture Mike?
12-09-2009, 03:42 PM #4
Yep, Don't laugh! Ken!!
12-09-2009, 04:12 PM #5
HAHAHA....Just kidding. Nice to put a face with the voice I spent all that time bull****ting with last year!
12-09-2009, 04:28 PM #6
I hear ya! Was it what you expected, that was like 12am after being there all day.
12-10-2009, 01:57 PM #7
- Join Date
- Mar 2009
- Cincinnati, OH
It is about impossible to NOT make over 700HP with your 2.8L --LOL
12-10-2009, 03:40 PM #8
those are awesome numbers and very good info..
12-10-2009, 04:49 PM #9
Replies: 2Last Post: 12-16-2009, 03:29 PM
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