disappointing dyno results - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #1 of 29 (permalink) Old 10-28-2014, 05:50 PM Thread Starter
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disappointing dyno results

I'm a new member and I wanted to ask about the dynotest results I just received. I have a mustang with 289 that's been rebuilt, bored 40 over , aluminum heads, intake new cam holley 4 barrel 600cfms , headers. The test results after 3 pulls were 180 hp. seemed really low. What else can I do to improve performance? Also this is auto c4 original rear end. Any tips would be appreciated, thanks
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post #2 of 29 (permalink) Old 10-28-2014, 06:05 PM
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Re: disappointing dyno results

Are you sure it doesn't say 280? A stock 4bbl should make that easy.
Something is very wrong. Is this in the car? thruigh the wheels? whats the gearing in the rear? What condition is you c4?
Ive got a 289 in a 67 fairlane, stock internals, rpm manifold, edel 4bbl, full length headers, 3.25 rear.
I would like to think your stang can could smoke my ride, but at this point, I think Ide walk on you.

1967 Fairlane 500 Ht 289/C4
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post #3 of 29 (permalink) Old 10-28-2014, 07:55 PM
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Re: disappointing dyno results

Welcome vintagestang..For anyone to help you we need all the details..What kind of heads,intake?..Specs on the camshaft? Compression ratio etc? If you have a printout of the dyno pull that may be helpful as well.


1968 mustang 408W Hybrid..Burns gas and rubber!
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post #4 of 29 (permalink) Old 10-28-2014, 09:56 PM
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Re: disappointing dyno results

That's funny.

I just restored a 65 289 4V and with only a +.060 over bore I got right about 275 HP.
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post #5 of 29 (permalink) Old 10-29-2014, 01:58 AM
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Re: disappointing dyno results

Quote:
Originally Posted by vintagestang View Post
I'm a new member and I wanted to ask about the dynotest results I just received. I have a mustang with 289 that's been rebuilt, bored 40 over , aluminum heads, intake new cam holley 4 barrel 600cfms , headers. The test results after 3 pulls were 180 hp. seemed really low. What else can I do to improve performance? Also this is auto c4 original rear end. Any tips would be appreciated, thanks
Chassis dynos are for tuning not for estimating Horsepower. Did you make any changes to the carb like trying smaller jets or changing the timing and distributer curve? Take it to the drag strip with some drag radials and you will get a better idea of how much power it makes. To gain some more performance change your gear ratio from the stock rear end to a 3.25-3.50 ratio.

Last edited by cmefly; 10-29-2014 at 04:52 AM.
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post #6 of 29 (permalink) Old 10-29-2014, 05:21 AM
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Re: disappointing dyno results

hello;

from a dead stop, mash your gas pedal to the floor up to 35 mph and tell us EXACTLY what it does.

give us ALL, ALL, ALL, Your specs, part numbers, brands etc..ie pistons, heads, cam specs.

unplug your distributor vacuum advance and plug it and leave it plugged.

give us your timing at idle then rev your engine to around 3000 rpm and give us your timing.

rev it slowly and tell us what rpm it quits advancing at.



iyeah i
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post #7 of 29 (permalink) Old 10-29-2014, 08:12 AM
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Re: disappointing dyno results

If they are chassis dyno numbers, especially if they were obtained through an automatic transmissions... they aren't that reliable. You lose a ton of power through the drivetrain, especially through a torque converter and auto trans.

That being said, it sounds more like a stock rebuild than a performance unit. Does it have headers and a large, free flowing exhaust? What kind of rpm does it turn? Details of the build?
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post #8 of 29 (permalink) Old 10-29-2014, 07:21 PM Thread Starter
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Re: disappointing dyno results

Thanks for your input on my dynotest questions. The rebuild was a top end kit through mustangs unlimited by edelbrock. I will post more details soon.
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post #9 of 29 (permalink) Old 10-29-2014, 07:29 PM
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Re: disappointing dyno results

That's what im sayin! ive got a 289 with a ba-zilion miles on it, rebuilt c4 with a b&m kit , 3.25 rear. Rpm manifold, 500 cfm edel, and full length headers with just glass packs bolted on the ends, pertronix and a flame thrower coil, and thats it, I think my flane would outrun the stang.
What exhaust are you running?
there was a thread here about a stang that was built to the hilt, and couldn't muster more than a couple hundred hp's, turns out, the exhaust system was to blame.

1967 Fairlane 500 Ht 289/C4

Last edited by angus67; 10-29-2014 at 07:39 PM.
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post #10 of 29 (permalink) Old 10-29-2014, 08:06 PM
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Re: disappointing dyno results

Quote:
Originally Posted by angus67 View Post
I would like to think your stang can could smoke my ride, but at this point, I think Ide walk on you.
Quote:
Originally Posted by angus67 View Post
I think my flane would outrun the stang.
.
We get the fact that you think your car is quicker..Not sure at how you arrived at this thought assuming you've never raced or even met?


1968 mustang 408W Hybrid..Burns gas and rubber!
[email protected] with a crappy 1.72 60ft.
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post #11 of 29 (permalink) Old 10-30-2014, 10:38 AM
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Re: disappointing dyno results

Vintagestang, welcome to the Forums. I'll repeat what has been said, that HP numbers from a chassis dyno are next to useless. That's not what they're for. It's the info that's gained from it that is valuable, and allows increasing power to the rear wheels based on that info. Seriously, don't sweat dyno numbers. Post the dyno sheets, all the info about your build, and the rest of the car.

David

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post #12 of 29 (permalink) Old 10-30-2014, 07:10 PM
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Re: disappointing dyno results

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We get the fact that you think your car is quicker..Not sure at how you arrived at this thought assuming you've never raced or even met?
Im sorry. I didn't meen for that to read that way.
I'm just saying with just simple bolt-ons vs. a top end rebuild, his motor should beat the snot outta mine. I didn't meen to sound like a jack-a$$.
I do hope you figure this out.

1967 Fairlane 500 Ht 289/C4
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post #13 of 29 (permalink) Old 10-31-2014, 05:30 AM
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Re: disappointing dyno results

Are you sure the carb venturis were fully opened....?

this is a comme issue with dynotests and bad linked carbs

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post #14 of 29 (permalink) Old 11-01-2014, 07:52 PM
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Re: disappointing dyno results

what heads and size heads? 93 gas? timing was set at ? what kind of carb
vacuum secondary vs mechanical
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post #15 of 29 (permalink) Old 06-02-2016, 05:50 PM
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Hello, I joined this forum for exactly the same reason. I have a 1966 Ford Fairlane with a 289 and a c4. Over the winter, I purchased the Edelbrock e-street kit, complete with cam, lifters, timing chain, gears, aluminum intake and heads. Topping it off is a Edelbrock 500 cfm carb. Bolted to the heads are a set of Hedman long tube headers. I also changed it over to a HEI ignition, and added a Edelbrock fuel pump. Needless to say, I was pretty excited about firing it up for the first time. Long story short, I expected a lot more get up and go. I checked my timing, and it was 12 to 14 before. I am at a loss, any help or advise would be greatly appreciated. Thanks, Mark.
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