I thought Since everyone was asking about it id post the SCC article:








AND HERS THE EXTENDED PART OF THE ARTICLE ON WIRING THE 4 WIRES NESSCESSARY FOR VTEC:

 

anybody know how much Hp/tq it adds, any dyno numbers? thanks for posting that article BTW

 

well the stock Si motor puts out 108 at the fly but if you swap the dx head to an Si and convert the dpfi to mpfi plus the slightly higher compression of the dx...you get a bit more horses and more torque than the stock Si motor...thats what i figure anyway...correct me if i'm wrong

 

I'm pretty sure the heads are the same, dx to si. I know it knocked about a full second of my quarter mile time, mpfi conversion

 

si has larger runners i think, different porting, small stuff.

 

i dont think the ehads are the same but i could be wrong. 70hp stock b15b2 motor mpfi put be at about 115hp. then the bolt ons. dunno where im at now lost to an 89 supra turbo by 1 car length. mpfi i/e and no interrior on 4 speed STD tranny. dunno well worth it

 

the dx and si heads are the same....teh si head has stiffer vavle springs and a more agressive cam...if u goto honda all the y sell now is the 88-91 vavle springs for the 88-95 nonvetc....just some food for thought thats all...
the mpfi ****** is the best thing u can do for minimal amount of $$ the car will run rich as hell...i have a afc on mine and i leaned it out havent been able to dyno it but last run before the afc was on it ran a 15.5 witch is about 5 sec faster than the stock 20 sec pass from the std