This evening I put my 99 4.6, auto, w/3.55LS on the dyno. It includes a K&N FIPK, JBA headers, Gibson sporttruck cat-bak and a superchip.

I did two runs, one without a fan and the other with the fan on.
Inside temp ~65 degrees. With the fan on, the garage door was open and it was brining cool 45 degree air in over the engine.

-dynorun 1 w/o fan
max HP=225.6
max TORQUE=263.6

-dynorun 2 w/fan
max HP=254.4
max TORQUE=302.2

I'll work on getting the graphs posted to web for closer examination tonight.

www.frontiernet.net/~overtaxd/dyno

 

Hey overtaxed

Thats not to bad, I have a set of JBA headers going on my truck next week, I also have a BBK 75mm throttle body and electric cooling fans. I wonder how much more power they provide.

Larry.

 

Pardon a dumb question. What fan are you talking about? external to deliver air to the engine, stock mechanical normally on water pump or something else?

Do you have dyno data prior to your mods?

 

I'm guessing here, but it sounds like a 20" box fan from Kmart, circa 1992. No, wait a minute... make that a Sears box fan from 1996 (the two are really very similar).

Take care,
-Chris

 

Curious
What are the original HP/Torque for your truck ?

 

sounds like one hell of a fan to give you a 30 hp and 40 tq gain!

you need to dyno on an RPM dyno in 3rd gear. Those peak numbers are during a shift and are gone before they can become usefull. looking at your dyno pics i'd say are effectively getting about 175hp@66mph and 230tq@55mph max to the ground on those runs. don't just look at the very quick peaks, look at where the graph is the majority of the time, i.e. in-between shifts


not trying to tick you off, just being objective. the rpm dyno done in 3rd gear will give you the most accurate results.


those peaky shifts are a product of the superchip and are why you probably feel stronger more responsive shifting which is a good thing, just not effective anywhere but during the shift.