15 psi
 

Ok. i have decided to build one of my engines to handle 15 psi. i have a d16z6 and a d16a6. the a6 is already out of the car, and i plan on selling the car that the z6 is in. i figure i can get more if it has a vtec engine,wahoo, ya know. so would it be easier/cheaper to do one over the other? id like to do it for as little as possible, of course. what do i need?

Re:15 psi
 

Most importants are
Turbo
450cc injectors
FMU or VAFC
Intercooler
Mising link
and you have to Lower your compression ratio somehow otherwise you/ll blow your internals

i run 17PSI but i have a small turbo K03

Re:15 psi
 

I'd personally go hondata if your built and going for higer boost. Or some kind of rom editor program. IMO ditch the Hack and Fmu setups (shouldnt be using a FMU Setup Anyway ::) ). How much power you looking for? I'm planning before summer going to build up my y7 to make 270-300hp.

Re:15 psi
 

sorry i should have been more specific. i was talking about building the engine, i am planning on rebuilding one of them, stock if possible, maybe some better rods, or whatever won't be able to handle 15 psi. i already have a 14b, a cc fmic, dsm 450's, complete msd ignition(not sure if i really need it), and i guess thats it. nothing is installed. i would like to see around 250 whp.

Re:15 psi
 

hell yeah dogg. i still think we should put the a6 back in the si and rebuild the z6. i'd say new rods, pistons, and get the crank micro polished and it should hold up. you'll need a standalone like hondata or zdyne.

also we are putting this in my 88 crx hf. would a si wiring harness work on that car? i've heard rumors that you HAVE to use the 88 hf wiring harness.

on another note, hf's are light as ----. i can pick the back end of mine off the ground 1 foot :o

Re:15 psi
 

you should also post or sleeve it if you want it to last imo

Re:15 psi
 

I agree with you GT. But people are always content in keeping their stock sleeves for some reason. ::) Do a good port and polish job on the head. Give it some more flow power for all that air.

I cant wait to build. :D

Re:15 psi
 

sleeving sounds good, but i wasnt tryin to break myself over this build, im still gonna have to do some more things to get the car im putting it in, in the shape i want it. block posting looks prety inexpensive. and are you saying ima need after market rods and pistons, or just new ones? im trying to stay under 1g for this build, is it possible??? o and yea we are putting it in your 88 hf. man thats weird i went from a 91 hatch to a 90 rex to a 89 hatch now to a 88 rex. thats weird

Re:15 psi
 

o yea and can i use a si harness on a hf chassis?

Re:15 psi
 

sure if you have the ecu. and for the record, the a6 bottom end is the best of the Dseries

Re:15 psi
 

I would say use ls rods and b16? pistons. Cheap, easy to find. Spend the money on management and machine work. IMO

Re:15 psi
 

ok so what about the a6 bottom makes it the best d series bottom? and are you 100% that the si harness will work as long as i have the ecu, i thought it would too, but i have heard diferent. and will the ls rods fit and hold upwards of 15 psi? whats better about the b16 pistons, opposed to stock. thanx alot for the help.

Re:15 psi
 

you can put b-series rods/pistons in a d-series motor???

Re:15 psi
 

no, a little while back there was a guy on H-T who was selling B16 rods, machined to fit in a D series, and 1JZ supra pistons (which fit) which caused some confusion about B rotating assemblies in D motors. IMO you can get NEW better rods/pistons for not too much more. but to each his own.

Re:15 psi
 

actually the a20a rods are the same as the ls b18 and the d16 i beilive. call eagle to confirm. the diffrence is in the big end width.

a20a rods is
19mm wrist pin

ls rod is 21mm wrist pin

d anything is 19mm wrist pins i belive they are the same lenght. a20a rods are very stout for factor rods.

the a20a rods will need to be machine down however to fit in the d16 crank journal. im not sure how much contact eagle.

either way there no big deal there. id you need or want pistons let me know i can get custom forged peices for $475 with tool steel wrist pins and rings.

Re:15 psi
 

ok so does anyone know what makes the a6 bottom end the best of the d-series for boost? and would it be safe to boost 15 on a rebuilt a6,or z6, with shot peened rods and a thicker headgasket? i might post the block as well, if i see that it would be worth it.

Re:15 psi
 

15psi with that turbo shouldn't be a problem as long as you get a good tune. I'm assuming you will be using an AFC? Maybe a wideband? What sort of pistons will you be using for the rebuild? Stock?
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Re:15 psi
 

, and get the crank micro polished and it should hold up.


why the hell would micropolishing the crank have to do with the motor being able to hold high boost?

Re:15 psi
 

If I was gonna build it cheap. I would you the z6, then a6, than a y8. That would be my order, but I can't give you a good reason why. ;)

Re:15 psi
 

yo doc, you said with that turbo, did you mean set-up? i want to use stock pistons and shot peened rods, will that work? i would rather use the afc hack, if its safe with that much boost. i guess it would be smart to get a wideband o2, how much do they run, usually?

Re:15 psi
 

Well, that turbo is pretty small so 15 psi isn't going to be a "huge" jump in air flow. I think it would be more than safe to run if you tuned with a wideband and an AFC. Widebands can go from ~$100~$500 depending on what you buy and if you build it yourself. I wouldn't want to run that much boost without it. :-\
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Re:15 psi
 

aiight well when the time comes, do you think you could help me piece on together or help me build one or whatever, im pretty good with electronics. and what about the shot peened rods and thicker headgasket, with everything else stock, do you think it will hold 15 psi?