a6 or vitaras? with my jrsc - Page 3

shifty35 · 01-26-2010, 09:52 AM

Originally Posted by Foowee

I took .075" off the deck of my a6 w/vitaras. I'm sure you could take some off the head. You could even glue some coins in the dish of your slugs( http://www.boostedmiata.com/technical/AC_05518.pdf ).

I have to say, that was an excellent read.

The_Beave · 01-31-2010, 12:20 PM

Originally Posted by dfreak

OK, so as you might have already know Beave I have y8 motor with a6 pistons .040 off the head , 4-1 dc sports header , intake ,cam gear, p28 with crome. I have a JRSC lying around at my home and i'm thinking of rebuilding it, port the intake manifold and the s-tube and put it on my engine , then get a good cam for it. My question is , would 11.6:1 be too much compression for a supercharged d16, if so then i would get a thicker head gasket to lower it to either 11.0:1 or 10.7:1 .

P.S ( I also have large injectors waiting to be installed).

Nope. It'll be fun. Just watch your plugs for signs of detonation. You'll have to pull a lot of timing, but, a setup like that won't need much timing at all to make good power.

dfreak · 01-31-2010, 07:48 PM

How much whp should I be able to make with a setup like that???

The_Beave · 01-31-2010, 09:47 PM

At least 170WHP. More probably, but, you'd have to have good tuning and invest in some good parts.

SOHCinWA · 01-31-2010, 10:04 PM

Originally Posted by andresdelsol

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which one will do better? a6 pistons (std) or vitaras(std)? i plan in a near future upgrade to direct injection of nitrous(100-200 shot)

Not going to happen for long with a cast piston and stock valves.

The JRSC was designed with the A6 pistons in mind. Why lose the much needed compression?

dfreak · 01-31-2010, 10:35 PM

Umm/?????? In what good parts should I invest?????? I would like to run 8 psi on it , don't think I will up the boost more because it will cause heat problems and I would love to see 180 whp. Does anyone know how high could the motor be revved with the JRSC??

The_Beave · 01-31-2010, 10:49 PM

Not much more than 7500RPM.

Don means forged pistons and rods.

The whole issue with most JRSC builds is simply that the M45 is too small. The M62 is much better suited to our engines. This was, in fact, done, but, finding a used Endyn kit is effing hard to do. Fabbing it up yourself isn't the hardest thing in the world, but, it takes time, paitence and helps to have a lot of spare parts for mockup.

a small turbo is generally much easier and less expensive to deal with, and will give comparable or better results since it will be easier to intercool.

swich · 02-05-2010, 03:33 AM

Originally Posted by dfreak

Umm/?????? In what good parts should I invest?????? I would like to run 8 psi on it , don't think I will up the boost more because it will cause heat problems and I would love to see 180 whp. Does anyone know how high could the motor be revved with the JRSC??

the formala for how hard you can rev it is crack pulley diameter X SC pulley diameter x max engine rpm. that must be most then 14000RPM ie rotor rpm

so in my case crack pulley is 6" super charger pulley is going to be 3.1" and rev limit set to 7500rpm

so 6x3.1x7500= 13900

im not sure what boost that will be tho. but i have taken the SC to it limit safely. still busy with the build.

dfreak · 02-08-2010, 10:27 PM

Damn!! Now i don't know which way to go. Should I supercharge it or stay N/A?? Any sugestions?? If I do go N/A will 11.6:1 be enough to run a crower stage 3 cam or not?

daveb91 · 02-09-2010, 05:01 PM

Originally Posted by dfreak

Damn!! Now i don't know which way to go. Should I supercharge it or stay N/A?? Any sugestions?? If I do go N/A will 11.6:1 be enough to run a crower stage 3 cam or not?

Ok im at 176whp with 10 psi on a JRSC theres not much left what do you have to do to get that NA????