Had several ask me about the motors, because they run well. I tell them they make 1150ish on motor. Then they say, "that can't be right, mine makes over 1200 and you guys are wearing us out, spraying less nitrous"............LOL, don't know what to tell you guy.

This is exactly what I'm saying.

I've done circle stuff that was 75 HP down on the dyno we were using. Yet the car was continually in the top 5, won a bunch and pulled most of the big HP cars 2 lengths out of the corner.

Had so many guys come in from a known local builder (he walks on water) and we would put the crap on the dyno and it would be down 50, 60 as much as 100 HP. So we would scale the car, do the math and then look at the time slips. Not one sigle time did our dyno numbers not match the ET and MPH close enough that we could definatively say either the other dyno was off, or someone lied.

Same thing with a different local guy, whose water brake dyno we would rent if we needed to. His numbers were spot on. We could go from the pump to the wheel dyno to the track and very seldom was I off more than a .1 when the car was sorted out. But that guy ate lots of crap for his engines being weak.

I was there when the same guy uncrated a Comp engine from California. We both looked at the dyno sheets and laughed. It was 90 HP more than the same basic combo the local guy was building. The California guy sold the local racer an expensive engine because he (the cali guy) told the local guy that he could set the National Record if he just dropped the coin for cali engine.

So onto the pump it went. It was 25 HP LESS than the local guys engine. Of course, the cali guy said the local dude was a liar and his stuff was the cats behind and he was an install and some tuning runs from a National Record. Into the car it goes and it runs it HP.

In fact, it actually made it's HP at a lower RPM and the torque curve
was rather strange (IIRC...I'm going back to about 1999 or 2000) so it was a bit slower than the local guys stuff.

Ironically, in doing the math, the local guys engine was running what all my math said it should for it's weight and HP.

The cali dude did not issue a refund when a National record was not set.

I agree with everything you say........and that is the reason I say a dyno sheet that says "X" doesn't mean anything most of the time. It's a number on a piece of paper, especially the ones who are touting the BIG numbers. Now, SHOULD it mean something, sure, but we all know it doesn't all the time. The average guy doesn't know who is legit and who is not, so don't take that number to the bank.

It was fun to see my Butt-dyno 'beat' a chassis-dyno on my daily driven '73 318ci Dart some years back.
The first run on the dyno made the best numbers. We made 6 or 7 runs but couldn't improve the results with simple timing and fuel adjustments.

I go mental when people say "I did xxx on a mustang dyno, on a dynojet it would be at least 50+ higher".. How many cars have you dyno'd that read higher on Dynodynamics or mustang than they did on your dynojet? I've had my share...

So far my dyno has been the stingy one That being said.. I do have access to a brand new Mustang dyno and as soon as I figure out how to use it I will do the Pepsi challenge. While Im on the subject. We had a very successful day yesterday on the dyno. Total of 7 vehicles from 9am to 7pm. I will try to post more information soon and I think it will make everyone (Mopar guys) happy.

Monty Whats your thoughts on tuning on engine dyno? I always have my engine dyno after every build, I have gotten conflicting results from our local chassis tuner basically been told it a good starting point only and track time is only way to really tune,

Your guy is ultimately correct, because there is no testing equipment I know of that can duplicate the dynamics of a running race car.

But the numbers should relate, be consistant and accurate.

Thats not entirely accurate. You can make full throttle quarter mile passes on a Mustang dyno.

Endurance racing teams will simulate 24 hour races on engine dynos, too. The technology is out there.

To give an update on the dyno day that I had on Saturday. I have people ask me all the time why I like Mopars. Of the seven vehicles that I tested the two that were most interesting. A 1969 Camaro with a 509 rectangle port headed engine built by a well known Chevrolet engine builder and a 1967 Dart with en EDDY headed 498 (builder unknown) The two cars were very closely matched in compression, cam, exhaust, and induction system. With one exception. The Camaro had a spacer plate under the carb that made an extra 150 hp at the push of a button. On motor, the Camaro made (from memory I'm not at the shop right now) 447 HP to the wheels and 538 on nitrous. The Dart made 452 HP. To answer the question, It takes a lot of Chevrolet to match a little Mopar. I will try to post some of the dyno graphs tomorrow.