I redynoed at FMS yesterday. The only thing I've done different since Feb. was add a ASP crank pulley. This is the same dyno. So I was expecting ~10-15 more rwhp. 5-7 from the pulley and 5-10 more from the engine having about 9,000 more miles on it. It made 365rwhp through the cats & 382rwhp through the cut-outs last time. This time it made 350rwhp through the cats & 365 through the cut-outs. These are the corrected numbers. I was hoping it was the 40* increase in the temp. since the last dyno runs, but Allan didn't think so. He said to do a compression test on all the cylinders. I bought the compression checker and will do that first thing in the morning. What do ya'll think? I mean, the truck feels just as strong, if not a little more stronger than it was after the first dyno.

 

I bet the heat has a LOT to do with it.

 

That's what I was hoping! Even 15rwhp across the dyno?

 

I would think more than that.

 

Man I hope so. How's the truck doing Flyer?

 

It's the heat man simple as that. Ever wonder why everyones best times are in the winter?/?...cold air = more power.

 

Dont put too much faith in it being the heat. I have dynoed my truck at FMS during the summer and winter with the same mods when I had the Whipple. I did that to see if the numbers would be any different dynoing in different temps. I was withing 1 HP on those dyno runs. Thats why the dynos use a correction factor, it gives you basically the average. Now if you did actual HP runs, or uncorreted, you would see different numbers during the summer or winter. One thing I have learned over the years is to listen to Alan, I would do the compression check then go from there.
Did you have him check the tune too? Or just make some dyno pulls?
Was the engine warmed up good? Or was the pull made on a cold or cool engine. There is such thing as good heat in an engine, you will dyno lower with a cold or cool engine than with one that has been warmed up.

 

Good info. I'm gonna go ahead and do a compression check in the morning to make sure. He let it cool off about 25 min for the first run. Then about 20 min each run after that. I thought that's what the "corrected" #s meant, taking into account the air and all the other stuff.

 

Mine's running ... sounds like hell with the shitty collector gaskets, but it's still running strong.

I should be getting another head from Blake to complete the l92 setup. Once I get those .. it's gonna be on!

 

Take it to the track and see if it performs, plain and simple, dynos are just tuning tools.