RE: [DML] Horsepower update

["Joseph Kuchan" <josephkuchan@xxxxxxxxxxx>]

Toby,

We ran several cars on a dyno here in the Chicago area a while back. I did 
an article in Gullwing on the results. I don't know how Winged1 is set up, 
but one of the cars we tested was Dave Swingle's bone stock car. It also 
peaked torque at around 3000 rpm at 138.7 ft-lbs, and horsepower peaked near 
100 at about 4900 rpm. We did not run it past 5300 rpm as we could clearly 
see we were already past the peak HP, and there was no point in going 
further and risking problems.

AFR at 3000 rpm was 13:1, and there was never a hint of detonation. The car 
was very well fueled across the band. While al lot of people have put down 
the Bosch CIS, I honestly don't think there is any "inherent limitation" to 
it in this application, and even if there was, with the design of this 
mechanical system it would not manifest itself as a notch in the A/F at one 
RPM. I suppose it is possible that the air sensor vane and/or plunger may 
have a little stickiness where you noticed the detonation. That would result 
in underfueling in a localized region of the curve as you describe.

Joe Kuchan


>From: "Toby Peterson" <Toby@xxxxxxxxxxxxxxxxxx>
>Subject: [DML] Horsepower update
>
>Hi Gang - I had an interesting experience today, spending the entire
>day with Winged1 on a chassis dyno. Winged1 turned out a consistent series of full power runs, making 110.1 horsepower at the rear wheels (5750 rpm), and  130.2 lb-ft of torque (3000 rpm)...... Got just a hint of detonation near the maximum torque part of the curve.  The A/F readings showed a bit of a drop-off in fuel delivery right in there, with good ratio readings on either side of that point.  The dyno technician felt that it was due to inherent limitations in the Bosch CIS.
>Thoughts?  Just another day in paradise.
>
>Toby Peterson  VIN 2248 "Winged1"
>DeLorean Parts Northwest, LLC
>www.delorean-parts.com



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