Hey guys im starting to plan out my build for a crx. I want to do a GSR engine with a jackson racing supercharger. However im looking for much more power than a stock gsr with a bolted on jrsc offers so i will be building the motor first. I would like to go a little crazy with the build, id like to spin the jrsc as fast as possible and rev the motor into the 10k-11k rpm range.

Id like to get well into the 350 whp range on this setup. Im thinking obviously new valve train including rockers, LMA's etc. port work, large cams (possibly hollow if available) for the rev range, balanced bottom end, possibly knife edged crank, ati damper etc.

Looking for some people with experience with JRSC's and built motors, and guys who have done high revving motors. Can the JRSC safely spin that high? And what options do I have motor wise for parts such as LMA's?

 

Why the head ache? Just sell that 1980's technology jackson racing supercharger and go turbo. If you don't have money even an eBay kit will make you 350whp.

 

I dont want turbo. Ive done turbo civics, i have a car to go "fast". I want to do a jrsc because ive always wanted one.

 

The JRSC isnt going to carry power that high in the RPM range reguardles of what you do to the motor, either be realistic with your goal or go back to turbo

 

Well realistic is a matter of opinion, but I understand your point. If the JRSC just doesn't flow enough CFM to make power that high, then ill have to re-think my plan. What do people typically rev them to? 8,500 is a common figure for alot of gsr owners for N/A and turbo?

Do you really think a jrsc on a built gsr wont hit 350? Thats an honest question...

 

no

 

X2

 

There's a huge jrsc thread on here - you should sift through it.

I'm going to be shooting for a more realistic 240-280whp with my b18c5 + jrsc and revving to 9200 on e85.

I believe the limitation is the more (over 12psi) you try to get out of the blower, the hotter it gets, robbing you of the power you're trying for and making it more detonation prone.

I'd say start with the gsr/itr cams and decent valvetrain, jrsc, kamikaze header, on e85.

Then go from there - ported blower, Lht air to water cooler, etc.

 

Realistic is a matter of opinion, but what has been proven time and time again isn't.

you could try an LHT intercooler, if they are still around.

 

That was my next question, what cams seem happiest with these superchargers. Is an OEM ITR cam really the best option out there?I understand its affordable compared to aftermarket, but money aside, whats the best cam for this?

 

if you are serious in trying to get that kind of power and rpm out of that setup you can forget the OEM cams...you will defiantly need something with a profile to make power over 9500rpm..

 

the best cams as you will find done by others is the GSR/ITR combo
but ITR/ITR would suit if going that high in rpm but you still need to pull duration via cam gears

with regard to the coment JRSC will not make power at that RPM
go read how a supercharger works !

a supercharger will make power at any engine rpm when the relavent pulleys are applied
to use the superchargers effective range of operating rpm

With a small misshap in swaping tunning maps my car pulled 9800rpm on the dyno
WHP still rising with my JRSC setup ..
this only happened due to the revlimiter being overlooked with a fresh map but proves the point it can be done

 

What he said...

Higher rev's don't mean more power a lot of people have a hard time understanding that :-p

 

Problem with S/C is heat once that SC is pushed pased its rpm and pressure limitations its going to do more harm then good. Its just not designed for the application the OP plans on putting it on. Build or not its just not going to happen. You might squeeze the 350 out of it with a huge pulley aftercooler and e85 for fuel but it will be a laggy piece of crappy like a huge turbo witha big pulley on it

 

especially with insufficient superchargers

 

So why don't you just put a larger supercharger than te JRSC? It would take some fab work, but seems more inline with your goals.

 

I had a JRSC on a GSR motor with ITR pistons an all the standard bolt ons portwork you name it i had it done back in 2004 i was a able to get 16psi with a JDM B20 crank pulley an a 3.2 SC pulley made only 287hp. Just use the ITR cams theres no need for anything else.
Now if use nitrous even just a single fogger you will hit 350hp No problem. Good luck ur build

 

16 pounds of heat to make a lousy 287whp. geez can do that on a turbo that has same responce as a s/c on less boost and no where near the heat output. i just dont understand s/c's on a honda engine. were not dealing with a 440big block here

 

Look into a custom Rotrex setup if you're dead set on supercharging.

 

I agree with you 100% the JRSC is not made for high HP output.

 

At that high of an rpm not only is the jrsc not going to make power but its just going to be a glorified heat pump. Many have tried and failed. The jrsc will not make your power goals and there's no point in spinning a motor to 10k unless you like having reliability issues and the ability to say "i rev to 10k"

 

Rotrex supercharger ftw. The JRSC is a glorified heat pump.

 

Above 9000 rpm you'll want to look into ITR cams. I don't recommend revving about 9500. It is too hard on components and not worth the hassle.

350whp is not realistic. It may be doable with a perfect setup using e85. I'm making 290whp @ 11psi in 3500+ft AD on petrol. That translates to ~ 320whp at sea level.

Ignore the peanut gallery. They don't understand the advantages of a positive displacement supercharger.

 

ITR cams wont get you there, You'll need a bigger exhaust cam due to the gases that will be produced in the cyls..

Explore the camshaft market a bit more.. Superchargers and Nitrous cars use the same type of camshaft profile due to the amount of exhaust gases they seriously kick up.. You'll need a very decent intake cam with a really beefy exhaust cam.

 

Thanks for all the information so far guys.

Im really not interested in using nitrous either, since this is going to be a street car for the most part. Seems like in regards to camshafts, its more of people just "saying" a specific cam is best, when in reality they are just repeating what has been said in the past instead of having dynographs and data to prove their suggestion. I think im going to go with something a step larger than ITR cams and obviously gears to play with duration.

Im thinking I may be better off going with something along the lines of a stroked B20 (2.1 maybe?) to get closer to my target, although im not sure what type or RPM capabilities a stroked B20 block can handle.