Sideways

You are seeing about 2 rwhp and 5 ft lb torque. I was seeing about that below 10 psi in the power band. As the boost went up so did the increased torque/power up to 22ft lbs and 33rwhp. Even if I allowed 3 times your results, ie 6 rwhp and 15 ft lbs torque, it is less than what I saw. I assume the cam timing changes allow the S to make some significant power.

06S2k07Si

Care to post what your timing changes were on the gears? ...also you have a combination of AP1/AP2 cams right?

Sideways

I advanced the exhaust and decreased the overlap. AP1 cams.

518135

Looks like you didn't get quite what you expected but you don't know until you try.

Sportster

It seems that a dual 60 to 50 and a 63.5 has been tested up to now. It would be interesting to see a comparison between a single 60 and 63.5 against the duals 60 and 63.5.

GT Motoring

Thanks for taking the time to do all these dynos Brian. Its greatly appreciated by myself and im sure many others. I'm glad the Hytech header put out better numbers both peak, and in the area under the curve.

I think we are all a little shocked that the exhaust dropped some power though. Be great to see it tuned with the fujitsubo and hytech combo to see what effect it has.

Thanks again!

ILoveMYHonda1984

Looks like Ill be keeping my header afterall. I was contemplating it but looks like the 2.5 is a better bet atm.

06S2k07Si

You're welcome!

Donations for the next dyno are welcome! I may just do it just before I put it away for the winter.

Brian

06S2k07Si

After several discussions with John, he has suggested some changes. Modifications will be under way shortly.

At this point all I care to do is make back the power that I lost...of course more would be ideal! (especially for the $$$ that I've spent on this)

...as usual...to be continued.

Brian

lookinco

Did you ever do a comparison with a stock exhaust?

I am deciding between stock, Fujitsubo, and Hytech myself as well.

I have had 4 different exhaust and they were all too loud for the track. Now I just have the stock ones on. I am also running Kraftwerks and J's header.