Supercharging the EJ25

Jack · Post by **Jack** » Tue Nov 14, 2006 6:47 pm

Has anyone seen or heard about this supercharger kit from Raptor?

http://www.raptorsc.com.au/kits.php?id=20

Jack

waggaclint · Post by **waggaclint** » Tue Nov 14, 2006 7:21 pm

that pretty cool hey its pity they dont do that kit anymore hopefully someone will help em out with it....

AndrewT · Post by **AndrewT** » Wed Nov 15, 2006 1:10 am

hehe common Lapsed........!

Lapsed · Post by **Lapsed** » Wed Nov 15, 2006 9:23 am

It is very tempting, very very tempting.

E.O.I - Left arm, 1 kidney or first born ??? :P

chris

BrennyV · Post by **BrennyV** » Thu Nov 30, 2006 6:26 pm

do it!! you know you wanna

KERAZY · Post by **KERAZY** » Thu Nov 30, 2006 9:23 pm

steal their design.

or run 8 SC12's. that might work

KERAZY · Post by **KERAZY** » Mon Dec 11, 2006 9:15 pm

sorry to bring this back from the dead, but I've contacted these guys, and I've found out that they can be run on any of the EJ20s, EJ22s, and EJ25s. apparently they can be adapted to the 6 cylinder ones. The kit is priced at $5700, and they WILL get it in. they say soon.

Bit of an alternative to the ol' EJ20G innit?

stinky · Post by **stinky** » Mon Dec 11, 2006 10:26 pm

not at that price it's not! buy a couple of EJ20G's, hell you can get a close to spankers EJ25T engine out of a forester for that sort of money.

KERAZY · Post by **KERAZY** » Tue Dec 12, 2006 12:17 am

kit includes ECU, wiring, mounts, supercharger unit itself, basically everything you need bar stronger internals (which you don't need straight out. standard internals on EJ25 can withstand up to 9psi).

on an EJ25, the kit with forged pistons running 12.5psi made an 80% power increase. 139kW at all four wheels in a subaru RS impreza 2.5. 185kw or so at the flywheel. Thats better than a WRX apparently.

I reckon it'll pick up. RS Impreza is about 20 grand. families will buy them as daily drivers etc., they'll think about more power, then they'll have the option of either trading for a WRX and probably losing money, or buying this kit and having nothing but gains. Plus, it adds a whole new frontier for subaru performance. it won't simply be 'turbo bov intercooler' any more.

AndrewT · Post by **AndrewT** » Tue Dec 12, 2006 12:30 am

I would consider it if it filled any of these criteria..
1 - Cheaper than turbo setup
2 - More reliable than turbo setup
However it is infact....
1 - More expensive than turbo setup
2 - Less reliable than turbo setup (unless you build a custom motor - further re-enforcing the above)

I'm not sold yet.

"on an EJ25, the kit with forged pistons running 12.5psi made an 80% power increase. 139kW at all four wheels in a subaru RS impreza 2.5. 185kw or so at the flywheel. Thats better than a WRX apparently."

This is true but thats not comparing apples to apples.
If your going to all the trouble of building a motor with forged pistons why not use a turbo motor. The turbo motors already run around 12psi of boost, with forgies you can wind it up even further.

I suppose alot depends on your application. Supercharger would be awesome offroad because of the minimal lag.

KERAZY · Post by **KERAZY** » Tue Dec 12, 2006 2:17 am

AndrewT wrote: I suppose alot depends on your application. Supercharger would be awesome offroad because of the minimal lag.

that was the concept I was following with it. Apologies I didn't mention that in my enthusiasm about this topic.

if you were to use a turbo engine, the only thing it would do would eliminate lag and create more power on the down-low. I don't think it'd be worth it in the long run. I do have to agree with you STRONGLY on the price. It's not like I'm sitting here going 'and YOU can have this f-aaaaaantaasstic supercharger kit for only $5699.95!' with a lady at my side going 'wait, did you say ONLY $5699.95?', and that repeating over and over. To be honest, I don't know where I sit with this thing now. The pros and cons are pretty balanced to me.

Apples to pears then? One is softer than the other.

Ok, money aside. Would you get one given the chance for <insert purpose here>?

BaronVonChickenPants · Post by **BaronVonChickenPants** » Tue Dec 12, 2006 8:47 am

If you had the time I reckon you could do it yourself for far less than that, take the wonderbrumby for example, I'd wager his whole EJ22 + supercharger setup came in under that.

Even if you wanted to use the "centerfugal supercharger" they're spouting on about (just looks like a turbo compressor housing with a pulley to me) it can't be too hard to put all of it together

Obviously the hard part is getting the tuning right, mixture, pulley ratios and what not, but thats all part of the fun and the reason we're all here

Then just add a WAIC some water methanol injection, and a healthy fuel budget

and you're on your way.

Jordan.

BRUMBERTY · Post by **BRUMBERTY** » Tue Dec 12, 2006 10:01 am

BaronVonChickenPants wrote:take the wonderbrumby for example, I'd wager his whole EJ22 + supercharger setup came in under that.

You would win that wager Baron.

unless I could charge for my time that is.
I estimate it could be done for about a grand worth of bits, there are heaps of blower options that I have found.

KERAZY · Post by **KERAZY** » Tue Dec 12, 2006 10:06 am

fucker, explain yourself.

now.

edit: i was smiling when I wrote that, just so you know.

BRUMBERTY · Post by **BRUMBERTY** » Tue Dec 12, 2006 10:37 am

Well, seeing as you asked so politely....
You could start with a cheapo engine or bits of several.
I would use a EJ18 block and EJ22 heads, stock internals, giving good reliable (slightly lower) compression
or an EJ22 with SOHC EJ25 heads for more capacity.

Headers
upgraded fuel delivery capacity (I use LPG)
Eaton supercharger from ebay ($200 US ish)
Toyota 1GG supercharger $400 Aust. ish
Nissan supercharger from V6 $320 US

Hose,
Pipe,
clamps,
metal stock,
welder,
lateral thought,
knuckle skin,

another blower when it backfires,

and another,

Engine Timing managment (should have been at the top of the list)
Runs like a deere now.

Post by **yarney** » Wed Dec 13, 2006 5:49 pm

Come on jack stop dreaming and just put that ej25 in your brumby you won't need a supercharger then it might be as fast as my l-series then LOL LOL LOL

Jan

steve_rising_sun · Post by **steve_rising_sun** » Sun Dec 24, 2006 10:40 pm

I put a blower from a 1GG on to a stock EJ22[ there is a picture on our web site] it only ran 4-5psi with a stock ECU and it was brilliant. The cost to do this is a lot less than these kits. I soon got bored and then put in the EG33.
Steve