I just dynoed my truck today. My numbers seem kinda low though:
309.8 rwhp
368.7 rwtq
The engine was warm
97.5*F air temp
29.92-0.44 in.hg.
only mods are x-pipe/cats, cat-back, GMS MAF. Are my numbers low?

 

ttt

 

Are those SAE corrected numbers or actual #'s? Did you give the truck plenty of time to cool down before dynoing? Also, you're spending your money on mods in all of the wrong places. You need a chip and induction kit. That will make a significant difference in your truck.

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'01 silver Lightning
Superchips flip chip, JDM filter kit, Wet Okoles
'67 Chevy II Nova
10.62 @ 125 MPH N/A

 

Those #'s are SAE corrected, as measured on a Dynojet 248c.

Oh yeah, the truck was @ normal operating temp. (I'd been in traffic w/ AC on for a while), and it was 97* outside.

 

BP is low; Temp is high; truck is hot (and it gets hotter right after you turn it off). Surefire formula for low dyno numbers. Then there is the potential for operator error. Some dyno operators don't seem to know how to use the equipment.

The best way is to let the truck completely cool then just bring it up to about 140 degrees (water temp).

 

Seems low to me as well. I would go back when the weather conditions are a little more LIGHTNING FRIENDLY, and not that hot.
Why not try the stock meter as well? just to compare the 2.

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Spiro-THE"GREEK"

12.373 @ 110.15@ 4700lb w/out the Go-Go juice
11.94 @ 115.31@ 4700lb with 100 shot Go-Go juice
11.40 @ 113 with 150 shot(on the brakes)NOT BACKED UP 4700 lbs.

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