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Thread: Got my car Dyno'd today

  1. #1

    Got my car Dyno'd today

    Well, since I bought this car the only thing I knew was what I was told, and so far what the guy told me has been true.
    My buddy and I thought the car was running really fat since the car was getting so much faster once it got cool, and plus the plugs were really black.
    So, we put new plugs in it, and cleaned out the fuel filter and took it to the KPE today to have it Dyno'd..

    I was told that the car produces 700 hp by the owner..


    On the dyno.. this is what it did... This is the Hp to the ground.. Shop owner told me that you can tack on another 200 to 225 to the final number.. Said it can vary but that is close.. So.. My car would be at 725 or 736 Hp to the ground.. So once again the owner was right on..
    After the first dyno pull we found that instead of being Fat ... It was pretty lean so he started re-jetting it..On the first pull the jets were 92 in the front and 93 in the rear.. So he bumped it up and found that the car liked more gas.. so we jumped up in jets again and again and finally we got to the biggest jets that he had which were 98 in the front and a 99 in the rear. He said it was still lean and it would take more but he did not have anything bigger..

    So...We left it at that.. gained 8 hp by re-jetting it, and he said that the timing was good and did not make any changes on it.
    Told me I could put it on Alchol and it would really wake it up even more and would drop into the 5's with ease.. So.. Maybe over the winter time I can save my pennies and get me a bowl for it.
    He also said that the car was pulling fine and that he really did not see a reason to drop to a smaller tire because the car was so consistent. I asked him if I could drop at least to a 32" tall tire and he said that would be fine and it would pick up a little more with that.
    He also said that the car is hitting the 500 hp to the ground at 5000 Rpms which it hits pretty quick. He said its running very nice.

    Overall, I was very pleased with all that was done today and now I am excited to see just how much that little tune will do for me at the track.



    This is the fuel and air mixture and it said he likes it to be around the 12 area... As you can see it is still running lean. He said that old plugs were more than likely black because of it sitting at idle for periods of time.

  2. #2
    Senior Member RACING JUNKIE fla1976's Avatar
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    Impresssive.

  3. #3
    Senior Member EXPERT BUILDER gearhead1011's Avatar
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    The jetting on the dyno is going to be different than what the car will want on the track although it should be a good place to start. Your car isn't moving when on the dyno so it won't allow for variables you have on the track such as fuel sloshing and the effect of the air coming in the scoop.

    200 HP loss from the crank to the wheels sounds like a lot. I know there are a lot of things to take into account but I was under the impression that there is usually a 15% to 20% loss on most race cars. 200 on yours would be closer to 30%. Of course there will always be a difference in the numbers from one dyno to the next.

  4. #4
    Here is a link to the guy who tuned my car... Builds and tunes some pretty crazy cars,
    Name is Tommy Keeter owner and operator of KPE.. He is a young guy who worked with Eddie Hill back in the 90's on his Top Fuel Dragster.
    He has some killer video's and pictures of the cars.. He has a killer Pro Mod that he drives as well. :racing:
    http://kperacing.com/downloads.html


    He might have a pretty good idea what he is talking about.. or at least I hope he does. 8)

  5. #5
    Quote Originally Posted by gearhead1011
    200 HP loss from the crank to the wheels sounds like a lot. I know there are a lot of things to take into account but I was under the impression that there is usually a 15% to 20% loss on most race cars. 200 on yours would be closer to 30%. Of course there will always be a difference in the numbers from one dyno to the next.
    Chuck I know from exp that here at the wheel dyno,even a rear gear change will up or lower the RWHP number.Also we switched from a manual 5 spd to an auto C4 with a 3500 blower convertor and the power went from 663 @ the rear (manual) to only 584 RWHP with the auto.Auto's suck the power on a chassis dyno....Prob why you run a stick...auto suc :wink:
    P.S bought me a 93 coupe stang for the street.5spd... :wink:

  6. #6
    Not sure if I posted it or not but I am running a 33" tall slick on the back with 411 gears.. I may drop down to a 32" tall slick and once the temps drop back down that should get me in the 5's.. Was knocking on the door the other night when I ran a 6.01..

  7. #7
    Senior Member EXPERT BUILDER
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    Quote Originally Posted by stinger124
    Not sure if I posted it or not but I am running a 33" tall slick on the back with 411 gears.. I may drop down to a 32" tall slick and once the temps drop back down that should get me in the 5's.. Was knocking on the door the other night when I ran a 6.01..
    How heavy is the car? Runs good.


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