i was reading an article on a crv motor, and it said tuning the top end did nothing for it, power wise, but it said tuning the bottom end did, can some one explain to me what tunning the bottom end would involve and what there is involved in tuning the top end, in the article i believe it said playing with the timeing on the bottom end how do you play with timeing on a bottom end?
thanks
sorry if these sound like stupid questions,
but im gonna have to learn and that means im gonna have to ask sometime
thanks again
mark

 

Uhh...probably talking about the bottom and top of the rev-range. That's the only thing that makes sense to me. If you're "tuning" the top-end (head) then you're definitely going to be making some power.

Hmm...although if you play with the timing, it's going to change throughout the rpm range. Hell if I know, that makes no sense to me.

 

this dyno run was on a diff board and was emailed to me and this is the article i was reading, tell me what you think

"Played with the Shogun for quite awhile, adding and subtracting fuel until the power went down. Leaning out the top end made a very small gain, but is probably not worth the risk of running too lean. However, the gains on the bottom end were impressive. Retarding or advancing the timing on the top end did nothing to the power curve, but advancing it on the bottom made a big dyno difference and a BIG street difference. On the street the increase pull was felt from 1500 rpm. Very interesting. And satisfying. The Shogun also makes it easy to raise the fuelcut, in 100rpm increments. I set it to 7000, though as you can see from the dyno curve, there is little reason to go that high right now."