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Old 04-23-2001, 08:43 AM   #1
Jimmy
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Post Eaton Superchargers Any good Supercharging a RS

What does everyone thing I'm thinking of supercharging My RS . IS it a good idea or is a turbo better. Supercharger is used that iam thinking of buying it is a Eaton Supercharger but it has very low miles on.

Help please I need some feed back
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Old 04-23-2001, 09:30 AM   #2
RacerinLSL
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Well, are you gonna fabricate all the neccessary plumbing yourself? What about ECU management? How is it gonna fit? I assume you have some angle of attack if you're actually considering buying this piece??? BTW, Rimmers first kit used an Eaton, but I'm not sure which model.

Chad
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Old 04-23-2001, 09:44 AM   #3
MY99 2.5GT
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Yeah, check out Rimmersuperchargers.com. Look for the autorotor hyperlink. The water spray innercooled kit they have would be so sweet and for $3700 for complete package that would be to bad.

Forced Induction put extreme heat strain on the engine which will cause certain parts to fail if they are not properly reinforced.

Superchargers have been hard to come by but if you can get ahold of one go for it.

[This message has been edited by MY99 2.5GT (edited April 23, 2001).]
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Old 04-23-2001, 09:49 AM   #4
SteveS
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Excellent post MY99 2.5GT! That should go in the FAQ somewhere.

Steve "huge FUD and misinformation fan"
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Old 04-23-2001, 09:55 AM   #5
MattC
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Steve's funny
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Old 04-23-2001, 09:57 AM   #6
Jimmy
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The supercharger i found is only $1850 it has everything i need, I need a fuel presurse riser and a sparktimer
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Old 04-23-2001, 10:04 AM   #7
Jimmy
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Iam so confused, I have no Idea On what i need to run The super charger.. Ill list all the parts it comes with later on today..
Iam only going to run 5 psi..
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Old 04-23-2001, 10:07 AM   #8
8Complex

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MY99 2.5GT - The only supercharger that has it's own oil reserve is the Rotrex (IIRC... may have been Vortech). The Eaton and the Autorotor have to have external oil feeds.

The benefit to the Eaton is that it has a bypass valve which allows the blower to drop boost to 0psi while under cruise load. I'm not sure this is on any of the blowers that Rimmer used to make their kits from (since it has been quite a while since they 1. put out and Eaton-based kit, and 2. put out any kit at all.

Just in case you didn't read that above, DON'T DEAL WITH RIMMER SUPERCHARGERS. The only exception is if you could pay upon delivery and making sure that it worked correctly. They had no idea how to work with the MY00/01 MAP sensor problem, so right now their kits only work on MY98/99 without modification.
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Old 04-23-2001, 10:24 AM   #9
RacerinLSL
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8-
Eatons don't require an oil feed line. They are a closed system good for 100,000miles supposedly. But other than that, I totally agree with everything you said.
Maybe Jimmy is buying an Eaton of a Grand Prix or something.

MY99 GT2.5-Explain how a turbo creates more heat/stress at a givin psi than a supercharger does. These two devices are two different ways to pack in a given amount of pressure. FAQ

Chad
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Old 04-23-2001, 10:47 AM   #10
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Its a used model, I don't weather to get a turbo or supercharger I want something that will last. I have a 99 RS IAm looking something good but not to expansive
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Old 04-23-2001, 10:49 AM   #11
MY99 2.5GT
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Thanks for the Stirn correction(s) guys. Lots of love out there. My information came from blips Ive picked up from reading other discussions and posts. I researched two supercharger kits a while back one was an Eaton. I'm not sure what the other was but both had self contained oil reserviors. Sorry if I generalized, thinking that all superchargers worked this way.

Which would you guys rather have? Turbo or Supercharger?? Let me know the pros and cons of your turbo experiences. If there is anyone out there with an EJ25 supercharged, what are the pros and cons to your setup?
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Old 04-23-2001, 05:32 PM   #12
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I have an Eaton SC on my BMW 318ti. Stock hp was 138 and the car has about 10:1 compresion. My car with the 65 cubic inch SC running 7.5 psi and a free flow exhaust puts out between 200 & 215 hp depending on whose number you believe. The kit I got uses an auxhilary fuel presure regulator to supply the extra fuel required.

I installed the SC with 63,000 miles on the car and I am now approaching 87,000 miles. I haven't had any problems and I get zero detonation and no lag. I don not beat on my car but I don't baby it either. The power increase is nothing short of amazing.

There are a couple of things that make the SC so dependable and trouble free.

1. The kit I bought (Downing Atlanta) is very well thought out and designed.

2. BMW uses a self tensioning pulley to control the serpentine belt tension so I don't have any belt slipping problems.

3. BMW's knock sensors and CPU do an excellent job controlling the timing and detonation.

The only real plus, that I can see with a turbo is no parasitic drag and the fact that you can run much higher boost with a turbo except the higher the PSI the more chances of blowing up the motor.

Steve M.
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Old 04-23-2001, 08:04 PM   #13
LangstonSubaru
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Jimmy, give me a shout or maybe search for my thread, I have one for sale that is complete and it works. I got all the bugs worked out before we changed our 01RS back to N/A and put it back on the lot for sale. Trust me, there was alot of effort involved in taking a Rimmer Sidewinder kit and adding an intercooler and making the engine live. Thanks Brian
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Old 04-24-2001, 12:53 AM   #14
dkpassat
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Just a heads up on the Eaton SC. I have a '95 1.8-ltr Miata with the Eaton SC pushing 8psi. The only problem with the Eaton's is the size of the SC to the size of the motor. The 45 cubic inch unit is really made for the 1.6-ltr engine. For mine they compensated by using a smaller pulley. The only problem is that at faster rotational speeds your return on investment diminishes quickly. Roughly translated means BIG time heat with no intercooler. My poor Miata is on the ragged edge of disaster with the boost upgrade. I have 2 systems for knock control, the MSD that retards with pressure (active system) and the J&S (reactive system) that has a microphone to hear for knock. The J&S have to hear the knock before it retards the timing, which is why I added the MSD later.
On the up side, the Eaton gives you power on demand like a bigger motor. Mine for the most part is an install and forget system. Cool little trick on my mass air sensor equipped car is that they use a resistor to fool the ECU to think it's -40 below zero and will add the extra fuel. Down side, it takes power to make power. Going from the basic 6 psi to 8 psi I now need to add an intercooler and add a bigger aux fuel pump. Seems like I go out to the garage every 6 months and through a lot of $$$ at my Miata to get a tiny return in power. If I could do it over, I would have gone turbo in the first place.
Make sure you get at least a 65 cubic inch Eaton if you go that route for the 2.5-ltr (the 65 may be too small). If the SC you are looking at is smaller you will need to spin it faster, which adds heat and then the killer knock rears its ugly head.
Last but not least go to Miata.net for more info on the Eaton supercharger, more info then you could ever want.
For stoplight to stoplight runs the SC is fun!
My $.02
David
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Old 04-24-2001, 06:57 AM   #15
Jimmy
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This is what it comes with He said that I need a presure riser too

It comes with all the hardware. wich includes:

Throttle body relocation plate
Inlet tract
Eaton unit
Large pulley driver nose
5 psi pulley and belt
7-8 psi pulley and belt
Bosch by pass valve.
All brackets, bolts and vacum lines.
Alternator new pulley
Hood buble

all this for $1850 Is it worth it

You`ll need for 5 psi of boost (larger pulley), a BEGi 2005 fuel pressure
riser, a walbro 255gph fuel pump, 7 or 8 heat range NGK spark plug (one or
two steps colder than stock).
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Old 04-24-2001, 06:57 AM   #16
Rich L
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I was toying with the Eaton idea like 18 months ago for my RS.

Jimmy, I would advise you not to go that route unless you know what your doing and have experience with tuning S/C'ers and Scoobys.

Bottom line is that a majority of ppl had trouble with that setup and either couldnt get it tuned properly or damaged their engine in the process.(not to metion Rimmer took some ppl's money)

With that said, there was advice was givin to me that I now pass on to you....

There are proven turbo kits available that will give you better performance and equivalent "bang for the buck"... if not better. Is it worth going through the nightmare of tuning something so risky?
Currently there are turbo kits and great tuners out there that can make your car faster with less hassle.

IMHO the tubolag debate is moot, its not how you get to the finish line, just all long as you get there first.

[This message has been edited by Rich L (edited April 24, 2001).]
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