i did a search and i'm still confused as hell. thats why i'm lookin for some input on something thats focused around my car... not a stock gs-r or an ls. anyways, i've been talkin to some people and i've heard that a jrsc with my current mods won't really help me in any way due to the climate. also if i do decide to get the jrsc, would i need to upgrade the ecu and fuel system?? i'm only plannin on runnin 6psi.

 

Supposedly you can bolt the JRSC on and it should work fine with yoru stock stuff.
You may want to get a better fuel pump just for the hell of it -- but injectors and ecu arent necessary.

NOw, as far as it not working in Ohio. that's lame.
If they're talking about humidity/heat in the summer - that goes the same for anywhere. The hotter, the less power the car makes, period. It will still add a buttload of OOMPH to your car though...

and in the winter, well -- the colder the better
=]

 

I don't see how your setup would limit the effectiveness of the JRSC. ITR cams aren't that extreme. Is there something unusual about the climate where you are? Ohio doesn't sound like the tropics to me, nor is the elevation really high.

The JRSC will work fine, within the limitations of the system. That is that there's no intercooler. I wouldn't buy the thing for my car, but that's because I prefer to do extended high-RPM running like on canyon runs and road courses and in these situations the lack of an intercooler is a big handicap. If you want to cruise around town and race assorted fools from stoplight-to-stoplight, it works alright.

 

well thats the same thing i thought of when i was told about that in ohio. i told the guy he was full of ****... oh well. this guy i know has this set up...
Fuel:
Jackson Racing Fuel Pump
Vortech Fuel Rail
Vortech Fuel Pressure Regulator

would you suggest anything different? he's runnin on 9psi

if you want you can go to streetimage.net and click on mikes name on the right to see the his setup

 

Actually adding an ITR exhaust cam to a JRSC set-up does yield some decent gains...

The optional aquamist system seems to work OK. It's no intercooler, but still...

Shingo

 

Water injection is a guard against detonation. It doesn't lower the charge temperature and doesn't do anything about heat soak.

If one were to add only one ITR cam to a motor with a JRSC'd motor, it would be the intake cam. With just the exhaust cam you wouldn't be able to suck any more air into the motor but some of the boost would creep out the exhaust valves unless you worked on dialing out the overlap. With a supercharger you want lots of lift and semi-long duration on the intake, and less lift and very low duration on the exhaust.

 

Are you 100% sure MrFatBooty I swore some f00s over at that other message board gave me conflicting info. I'll try to search for that post when I have time.

But yeah I've been informed numerous times of 10-30 whp gains from water injection on JRSC motors...so I really don't know what to think. What does water injection do to guard against detonation yet not lower the charge temperature/deal with heat soak?

Shingo

 

it is because exhaust gases flow more easily than the intake charge. you want the intake valves open as long as possible to get as much air as possible in there, but you want the exhaust valves open just long enough to let it all out, which doesn't take as long as the intake cycle.

 

Actually I wasn't disputing his intake cam suggestion, just the aquamist comment. I'll need to dig up the intake/exhaust cam + JRSC info as well...

Sometimes it's not worth being on 2 message boards I should just keep quiet...

Shingo

 

Essentially the way Aquamist works is you have a couple of additional injectors that shoot water instead of fuel. There's a water map in an ERL MF2 injector controller. The same controller can be used to map additional injectors. F-max actually includes it, pre-mapped, with their turbo kits.

Anyway, the amount of time the water is in the intake is too short to have any sort of cooling effect. As soon as it comes out of the injectors it gets sucked into the motor. The reason water injection lowers cylinder temps is that water has a very high specific heat. It takes a lot of heat to evaporate the water, which means that it can absorb a lot of heat. So when the water hits the cylinder, it is vaporized almost immediately. Some of the heat inside the cylinder is used up to do this. When the effect is taken cumulatively it helps keep the cylinder temps down.

Water injection does work very well as a detonation aid, and it does let you run more boost. It does not however, prevent heat soak from a compressor running for extended periods of time and does little to help cool the charge air.

Ideally you want both an intercooler and water injection. The intercooler would cool the charge air, which then makes it more dense. More dense = more oxygen to combust and the ability to combust more fuel with it. More oxygen and more fuel = more powerful explosion. More powerful explosion = more power. It also however, means higher cylinder temps. Add water injection and you can cool down the cylinders.