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 To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/dmcnews/join (Yahoo! ID required) <*> To change settings via email: mailto:dmcnews-digest@xxxxxxxxxxxxxxx mailto:dmcnews-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/