See the information in Bisimotos Dyno vault. If needed I can re-enter all the info here.


http://bisimoto.com/forum/viewtopic....c0d42b90c83fcc

 

Ok, so what's your point? You show me yours and I'll show you mine kind of thing? If that's the case then ...

http://www.google.com/m/search?q=ret...=2c0cec3b#i=97

 

Where did you get the Smsp 4-2-1 header? Almost all of the d-series headers they build are 4-1 not 4-2-1, in fact I am only aware of one 4-2-1 that Dave built and had on his personal car for a while. I think he did sell it, Im guessing to you?

 

Thank-you for sharing your results with us. You picked up a substantial amount of horse power and torqe at 3000-4000rpm and 5400rpm till redline! Looking forward to your racing results with your new power band

 

I picked up the header from an autocrosser from Midwest, I was refered to him by Dave ( I think that was the name of the person on the phone at SMSP) that he may have a header not using anymore that and was interested in selling.

I ran the SMSP header for half a season and was happy with it, ran the Bisimoto V2 for 1.5 seasons.

 

That must be the one Im thinking about.

 

Graph looks screwed up for my 4-2-1 prototype header based on my dyno results years ago. My torque curve was fairly flat (86 lb-ft to 91 lb-ft) not the 23 lb-ft range you are showing. However, te torque curve looks like a Bisimoto header as it is very peaky and looks more suited for a drag car than a street or road race car. NA cars "feel" stronger with this type of curve since the engine runs from very low torque to peak torque so one gets fooled by their seat of the pants. Where as an engine with a strong flat curve doen't give this sensation since you have steady power. Fact is the flat "curve" engines will be faster on track as they will do better if the engine drops out of it's sweat spot.

 

Even though he has bad grammar, "SMSP" is correct...