Rimmer Supercharger???

[hink01wag]

i recently bought a Rimmer Supercharger and am trying to collect some info, pros and cons, stats what i need to do to my engine so i don't blow it up!!! Ive found a few posts on NASIOC but no one has got into real detail. like compression ratios at RPM's, whether or not its crucial to do bottom end work on the motor... i need some help on this

here is an RS i found with it installed
http://www.youtube.com/watch?v=OfsmKoSUm-Y

[VIN CODE 6]

Wow, congrats on the find! From what I understand those things are hard to come by. I really don't know how much boost those are capable of producing but your probably looking around 6-7 psi. 10 psi is max for an N/A motor and that's really pushing the limits. If your happy with a mild amount of boost get some type of fuel and ignition control to compensate and have fun. If you want more boost there are several options such as an STI shortblock, EJ22T shortblock, and many others. Stock compression ratio on a N/A 2.5 is 9.7:1 to 10:1 depending on year. With 6 psi of boost your effectively running around 11.5:1 compression ratio witch is pretty high. Make sure you run premium and search the forums on here. Any info pertaining to turboing a N/A car pretty much applies here. As far as support goes I think your out of luck as Rimmer has gone under!

[subba]

it looks like a PITA to install properly.

[jey]

If you are comfortable with tuning you can probably get away with not doing any bottom end work, but if it were me I'd throw in an EJ257 (STi) shortblock. I've been running a light turbo setup that way for a while now and it works great, should be pretty safe for supercharging too.

[rougeben83]

the only thing I would be concerned about is the hood clearance of that particular rimmer kit in your youtube link (though I don't think that's a Rimmer, I remember it's a custom setup when the owner was selling it on rs25.com). The engine sits a couple of inches higher in the engine bay on the BE's vs. the GC or GD imprezas...

here's the old rimmer kit, does yours look like this one?

http://www.shamrockmotorsports.com/SC3.JPG

[hink01wag]

no its exactly like the one on the youtube clip...
i think im going to build a cal induction for my hood. that was one concern that i did have.

[rougeben83]

no its exactly like the one on the youtube clip...
i think im going to build a cal induction for my hood. that was one concern that i did have.

ah ok, well it looks well made when I was looking at it at least. IIRC the pulley is set at 6-8psi? The basic issue about running any aftermarket F/I setup on an n/a subaru is the engine management. Don't skimp on that aspect and make sure it's running correctly and the sc kit should last you awhile.

[hink01wag]

So here it is... i got it fabed up this weekend still need a cal induction hood and rout some of the wiring, hoses, and install the gauges.

https://sl-i.net/FORUM/images/imported/2009/06/img_3600-1.jpg
https://sl-i.net/FORUM/images/imported/2009/06/img_3594-1.jpg

painted the intake and did a bench mock up
https://sl-i.net/FORUM/images/imported/2009/06/img_4886-1.jpg
https://sl-i.net/FORUM/images/imported/2009/06/img_4884-1.jpg

[rougeben83]

you can always reuse the plastic scoop to route air into the filter, actually, it would point directly at the cone if it was attached in that pic...

looks good, how's the clearance on the firewall? The BE's have less room there than the imprezas...found that out the hardway when I was test fitting an aftermarket TMIC...

[hink01wag]

i got rid of all that when i put the aftermarket intake on. the clearance is fine on the firewall but the hood wont close, so that is why im doing the cal induction on the hood.

[hink01wag]

If you are comfortable with tuning you can probably get away with not doing any bottom end work, but if it were me I'd throw in an EJ257 (STi) shortblock. I've been running a light turbo setup that way for a while now and it works great, should be pretty safe for supercharging too.


:smt017 so i just got a ej25 block out of an 02 outback from a friend of mine. he broke the timing belt and smacked the valves on the pistons. can i have delta cams or whom ever i find to do the heads, and be able to put the full bottom end of an ej257 in the 25? will the heads work or even the block be able to handle the low compression pistons and upgraded cams?

i guess what im really asking, is the ej25 able to be an ej257? or is the ej257 a totally different block in its self?

[rougeben83]

If you are comfortable with tuning you can probably get away with not doing any bottom end work, but if it were me I'd throw in an EJ257 (STi) shortblock. I've been running a light turbo setup that way for a while now and it works great, should be pretty safe for supercharging too.


:smt017 so i just got a ej25 block out of an 02 outback from a friend of mine. he broke the timing belt and smacked the valves on the pistons. can i have delta cams or whom ever i find to do the heads, and be able to put the full bottom end of an ej257 in the 25? will the heads work or even the block be able to handle the low compression pistons and upgraded cams?

i guess what im really asking, is the ej25 able to be an ej257? or is the ej257 a totally different block in its self?

pretty much any H4 subaru heads will bolt up to any H4 subaru block. The hybrid setup (ej205 heads, ej257 block) is becoming pretty common in WRX's.

what kind of work are you looking to do to the head? You don't really need to change a lot in the valvetrain to get it to run boost (these are usually done when youre raising the rev limiter on an n/a engine). If it was a simple 3 angle valve job or something, a local place with a good reputation is going to probably be just as good.

[anothernord]

You can safely run 5psi with proper engine management. At the very least you need to run a rising rate fuel pressure regulator, or an apexi s-afc to control fuel. Since the Rimmer isn't setup for an intercooler (tmic at least) you'll have to watch out for any knock that is created from the higher cylinder temperatures. Get a set of one step colder spark plugs too.

Still, if you want long-term reliability, get a piggyback engine managment system, like the Greddy eManage, or Rallitek Perfect Power 6.