Re: Dyno down the road... Response to Jim

[Jim Conforti <lndshrk@xxxxxxxxxxxx>]

(Ya know... I just love this *grin*)

mark kibort wrote:

> If you are so brilliant, just please tell  me, just another uneducated sole
> on this list , how the dyno would give 4% gains on two differnent vehicles
> with the same very complicated test conditions.

  Without knowing exactly HOW you are testing.. i.e. I wasn't there to 
 WITNESS THE TEST.. but let me speculate that the dyno you are using
 has 4% within it's range of error or tolerance (2% * 2).. 

 essentially precision

 That's one possibility

 the other is that you aren't accounting for the elasticity of the 
 battery.. the power you gained at point X is stolen back later when
 the alt. has to recharge the battery!

> please tell be why , when I put a pressure guage in the air box , I measure
> .5 psi.  at 6000 rpm. and when i sealed it with cauk , it rose to a 1 psi
> vaccume.         Now, the question for you.  why did  the pressure guage
> measure .25 psi positive at 6000 rpm with the fan on.????????/  Does this
> have any realation to reality???   Is my test flawed ???

 Measure the MAP.. then get back to me.. MANIFOLD ABSOLUTE PRESSURE..

 That will tell you something! pressure in the airbox means zero..

 You can make the pressure in the airbox increase by slamming the throttle
 shut at 6000 rpms.. the engine lives off of MAP.. 

> Man, i have been talking about this for years . (the most hp doesnt give
> you the fastest car, its the shape of the torque curve.)
> So, You will be proud of me now.  not only do we just do a 60 to 100 run,
> we break it down to macro segments.   so we get 60 to 70 and 70 to 80 and
> so on.   This was interesting when I got 45 more hp from a cam and intake
> system, and did the test.  there was no difference on 60 -80, but 80 to 100
> their was a 1 second diff.    so over all the car was 1 second faster.
> 60-100..     This was a good test to get a feel of the shape of the torque
> curve or HP curve.    afterall  hp is just torque x speed   , right???

  Simply tap into one of the ABS sensors (using an INDUCTIVE pickup on one
  of the leads and you'll see wheel speed.. from this you can get a
  graph that's decent..

  But don't forget that it's dependent on car weight too.. so a fatso
  in the pass. seat will affect readings ;)

> Answering me with , because I said so doesnt wash!!!!!! 

  It should.. I've been personally building motors for some 20 years..

  Unless there is an outside power source, an electric fan will NOT create
  power in the LONG TERM.. short term it can swab off the battery..

  (Christ Mark.. even the people who SELL these electric turbos admit this!)

  Dyno tests don't prove anything on a device like this.. what you would
  need to do is see how much power you are also PULLING out electrically
  versus how much you gain.. is it PLUS or MINUS..

  Because you have a battery in the system, you won't know if you're
  gaining or losing overall.

  Jim

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