Dyno Runs for #1650 - IMBOC
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Old 07-30-2012, 12:48 AM   #1
Bullitt1650
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Default Dyno Runs for #1650

Just had the Bullitt dyno'd for the first time. First two runs with a Bama "race" tune @ 91 octane (all I can get locally) and both were very consistent @ 237 HP and 255 ft-lbs, which are both much lower than the advertised numbers even if you factor in drive train losses. I did a third run with the stock tune and the HP improved to 239.5 but the torque was unchanged. Any ideas why these would be so much lower than what Ford rated the engine and why the "race" tune is lower than stock?
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Old 07-30-2012, 06:55 AM   #2
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The only wildcard here is the dyno itself. I'll assume you went somewhere and did a group pull or a club "dyno day" like we've done here in Raleigh. Did other folks have low numbers as well? Maybe save up some coins and have the car dyno'd at another location just to compare. Your numbers do seem low compared to what I dyno'd. See 5386 dyno numbers in this thread. Mine ran one pull on stock and once w/ a 93 tune.
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Old 07-30-2012, 04:06 PM   #3
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As olds350 advised most likely the dyno. Certain dyno just show higher or lower numbers than other types. That is why it is nearly impossible to compare the numbers from one dyno to another.

The best use of the dyno is to determine how a change effects the car. When you compared the results of one tune to the other, that is a perfect use for the dyno. If you make other changes, use the same dyno so you are comparing apples to apples. Do not concern yourself with the overall numbers as that varies by dyno. If you are concerned with the overall numbers, then you need to find what dyno in the area shows the highest braggin numbers.
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Old 07-30-2012, 10:32 PM   #4
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This thread, post #6 can shed some light on dyno numbers.
http://www.imboc.com/forums/showthre...highlight=dyno
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Old 07-30-2012, 10:45 PM   #5
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Looks like the bama tune isn't that good of a tune to actually lose hp.
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Old 07-30-2012, 11:17 PM   #6
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Well, there was one other Bullitt at the dyno event and he ran 239 HP as well so at first I thought the dyno was running low like your theory. Most of the other cars were modified so we could not compare to factory expected values. This theory took a hit, however, when we ran a stock 2004 Mach 1 and it pulled 290 HP. This car was rated at 305 from Ford so either the dyno is running low and this car was under rated back in 2004, or the dyno is spot on and the Bullits were over-rated at 315 HP.
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Old 07-31-2012, 05:27 AM   #7
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Wow that is surprising. I had my Bullitt dyno'd 100% stop and it was 289.5rwhp and 301.5 rwtq. There was another Bullitt that had similiar numbers. Like it was said all dyno's are going to be different but 239? sounds really low.
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Old 07-31-2012, 06:36 AM   #8
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Had mine on the dyno and it gave readings of 305hp and 312torque with a Bama 93 performance tune and KRs as the only mods.

Another 20008 GT with just headers/CIA and Flowmasters did 298 and 302 respectively.
Don't know if any tune was involved.
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Old 07-31-2012, 09:43 AM   #9
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I wonder if they had it in 3rd or 5th gear when they pulled the numbers, that is the lowest numbers I have heard of. My Bullitt pulled a 276/294 stock. I would be 95% sure that the dyno was done wrong..
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Old 07-31-2012, 10:42 PM   #10
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As far as the gear I saw the speedo graphic they had on the monitor and it said around 130 MPH at redline so this seems right for 4th gear at 6500 RPMs. I guess I'll save up and try to get it done somewhere else to see if it repeats
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Old 07-31-2012, 11:19 PM   #11
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Bullitt's stock are suppose to be 285-295rwhp.

What type of dyno is it?
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Old 07-31-2012, 11:31 PM   #12
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Note sure what type but here's a link.

http://www.youtube.com/watch?v=CXW7lDOA2Fk
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Old 08-02-2012, 03:25 PM   #13
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Mine on a DYNOJET produced 275/296 totally stock including the original air filter.

If would be different on an different day even on the same dyno but at least it gives a ball park to start with.
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Old 09-16-2012, 01:22 PM   #14
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How hot was it? Did the car idle for a long period before? Sounds like a conservative dyno plus heat loss to me. The Mach1 was underrated BTW.
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Old 09-17-2012, 12:04 AM   #15
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from the knowledge ive attained from dyno's and dyno runs, i can say this. There are two main types of dyno's in use today. the Mustang Dyno and the Dynojet. The mustang dyno gives MUCH more conservative numbers but it simulates real-world conditions from what iv'e heard. Dynojets tend to spit out higher numbers. MOST people use dyno jets, but the hardcore purists in my area look for people with mustang dyno's.

From the numbers you said you got, i wouldnt be surprised if it was a mustang dyno..for a car that gets around 280 on a dynojet, the same car on a mustang dyno gets around 230'ish. hope it helps.
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