Originally Posted by SlowRider
Hi. I have a D15b7. Would it be better to do a d16z6 head with a 55 shot of nitrous. Or a d16y7 Port And Polished head with a 75 shot of nitrous.( I dont know if you can use this head so elighten me.) I am worried about the vtec with nitrous because of the higher compression wouldnt it blow the motor..I dont want to do a full swap and I want to stick with the D series. I already have a EX Tranny...Please serious answers and No swap to a B series Answers I want to do something with my D series to many people have a B series swap around where I live.
Either of these, w/o calculating, will give you (i am guessing) about 10:1 static compression ratio if my memory serves me (both heads have 34.6cc volume i think)...
Get the z6 head if it is in good condition. It breathes well stock and vtec is always a nice feature on a street car. I would say spend the money on the NX kit, run a 60-70 shot, run heat range 7 plugs (like NGK BKR7e-11) and retard your timing a few degrees, the whole time consult an expert to make sure the car is running well during juice runs (check plugs, etc...)
stuff like fuel pressure gauges, egt gauges, etc are not necessary with such a small shot and basic (unbuilt) motor...if something is going wrong on a juiced car, especially an mostly stock motor, by the time you see it on your gauge, it'll be toast anyway...the only mod besides the colder plugs i suggest would be maybe a higher flow fuel pump like the walbro 190 or 255, or atleast a unit from another model, i am not sure (again, i forget), but i believe the stock cx unit from 92-95 is very weak...also, the window switch is not a bad idea, especially if you have a stock revlimit/fuel cut...