both were on mustang dynos. last time around septemberish 2005 i dynoed 181whp and 158wtq. they tuned it and all that fun stuff and that was the final numbers

since then i havent done much, just an h22 tranny, Quaife LSD, and carsound catalytic converter. i figured id put down like 2whp more lol

not the case... today i went to a local shops (different from the first shop)kinda "grand opening" ish dyno day. $20 for 2 pulls so i figured id go for the hell of it. sadly i only put down 169whp and 137wtq on the first run and 170whp and 139wtq on the second run.

so my question is... what causes such a drop? i know different dynos put out different numbers but they're both mustang dynos so id assume they'd at least be relatively close to each other. and it was a tad warmer today than when i dynoed back in september (was almost night time). but i cant see losing 20lb/ft over those two things

i have the sheets but no camera or scanner unless you include my camera phone but i dont know how well that would do. and besides, the sheet from a few months ago and the sheet from today are totally different looking so it would be sorta hard to compare the two.


if my car hadnt just been hit and run two days ago id be buying parts for the head right now

 

A Quaife will use some more power, but not 20lb/ft. And did they have the correct/new gear ratios? That would have a big impact on the dyno calculating torque.

Also, Mustang dynos have many many different variables & modes that are set by the operator. Very easy to get different results from the exact same car.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Daemione &raquo;</TD></TR><TR><TD CLASS="quote">A Quaife will use some more power, but not 20lb/ft. And did they have the correct/new gear ratios? That would have a big impact on the dyno calculating torque.

Also, Mustang dynos have many many different variables & modes that are set by the operator. Very easy to get different results from the exact same car.</TD></TR></TABLE>

well i told them it was a 2.2L motor and they never asked about the tranny

and one variable i think they got wrong was the weight b/c they went off some chart they had saved (of every car imaginable) and it was like 3125 for my car!

so i would think that since it thought my car weighed more than it actually does then it would read lower b/c my motor wasnt actually pulling that much weight. that prolly doesnt make any sense whatsoever i makes sense in my head tho hahah

edit: just checked the old sheet... they used the same weight so i guess weight is not a factor here

 

Yeah, if they didn't have the correct gearing inputted, the results will be way wrong.

And weight would never be a factor on a dyno anyway . . . unless there's some kind of crazy tire-friction loss calculation because of the dual rollers. If that's the case, count it as reason #56 why I don't like Mustang dynos.

 

different calibrations can effect the hp result, tire pressure, temperature, humidity, gearing...etc.

 

Also check the correction factors. sae vs uncorrected will yield different results.

Rule No. 1 about dynos.... they all read differently.

 

what gear did they do the pull in

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Daemione &raquo;</TD></TR><TR><TD CLASS="quote">Yeah, if they didn't have the correct gearing inputted, the results will be way wrong.

And weight would never be a factor on a dyno anyway . . . unless there's some kind of crazy tire-friction loss calculation because of the dual rollers. If that's the case, count it as reason #56 why I don't like Mustang dynos.</TD></TR></TABLE>

someone correct me if im wrong here but on mustang dynos you enter the weight of the car so that the dyno can put a load on it so it will put down *approx* the same numbers as it would driving down the road.


i sent the guy that tuned my car back in september an email to see if i could jump on their dyno again sometime soon

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98vtec &raquo;</TD></TR><TR><TD CLASS="quote">different calibrations can effect the hp result, tire pressure, temperature, humidity, gearing...etc.</TD></TR></TABLE>

funny you should post here... when i pulled lower numbers the first thing i thought was "oh **** i pulled a Blake" you know what i mean

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by crdcz03 &raquo;</TD></TR><TR><TD CLASS="quote">funny you should post here... when i pulled lower numbers the first thing i thought was "oh **** i pulled a Blake" you know what i mean</TD></TR></TABLE>

 

i just heard that after i left they found out there was a broken sensor... i dont know if this means that it would read lower (i asked and am waiting a response) but they did offer 1 free pull and for the people who didnt get to go some other sort of discount the next time.

hopefully for the next pull ill have a camera