| Author |
Message |
    
Neal Glessner (Nealg)
| | Posted on Monday, October 28, 2002 - 10:57 pm: | 
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Has anyone ever put a super charger on a disco? I know they make one for a Defender. What kind of supercharger is it? Where can I buy one? |
JEN STOLEN (Rovr4x4)
| | Posted on Monday, October 28, 2002 - 11:35 pm: |
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I know a company out in California was putting them on the 4.6 RR but do not know the company. |
Steve
| | Posted on Tuesday, October 29, 2002 - 01:02 am: |
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Neal,
I would't advise using a supercharger on a Disco. 2 Reasons: The first has to do with how blowers make horsepower. They increase presure in the cylinders. Rover's don't do real well with much additional presure until the revs are up. They already need high test to avoid detonation problems so increasing lower rpm combustion chamber presure invites problems. Unfortunately, where you generally need the horsepower is at lower revs. As such blowers don't fit the off road working range very well. The second reason is you have to spin them to get them to make pressure, turbos are subject to lag and belt driven ones if geared low enough to avoid lag problems encounter the detonation problem mentioned above. Admittedly, all this goes away if you are dealing with a diesel or are planing some major engine mods as well. In which case a 4.6 or 5 liter swap might be a better setup.
You might also do a search for super charger as I remember a prior thread on this topic.
Steve |
Paul T. Schram (Paulschram)
| | Posted on Tuesday, October 29, 2002 - 05:55 am: |
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There was a guy on the D-90 board few weeks ago, selling the blower off of his Defender. I believe it was a Rimmer Bros. and included all of the ancillaries necessary to mount it up.
It may have some downsides, but it beats the hell out of nitrous.
But, both will drastically accelerate the bad things that can happen |
David Marchand (Dmarchand)
| | Posted on Tuesday, October 29, 2002 - 08:12 am: |
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For that kind of money (Rimmer, brand new), you'd be better upgrading the DII motor to the 4.6....
But the research would be a pain. I doubt a dealer would be willing to help you on that one. |
jim
| | Posted on Tuesday, October 29, 2002 - 09:14 am: |
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I have a SC on my Disco 1. Rimmer with a modified Eaton m90 to make it more efficient. |
muskyman
| | Posted on Tuesday, October 29, 2002 - 09:40 am: |
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steve,
allthough you may have a general idea about super chargers you are missing a few key points.
sc's come in either direct drive or centrifical drive.
a direct drive charger using a boost blow off/wastegate can be geared to put the boost anywhere you want. you can then set it up to produce boost in the low rpm range to get the same cylinder pressure that the motor would have at its factory intended maximum rpm range.
the whipple charger has done this for almost 2 decades without burning up or detonating pistons to death. because they are direct drive they also have no lag and put the power where you need it.
the temptation to try to produce peak horsepower is where most guys run into problems with a super charger.
now back to rimmer...rimmer is a pretty half assed company that has built a bunch of shitty kits that really send you down alot of dark tunnels alone. I did a rimmer kit on a subaru and they where really piss poor people to work with. we ended up going it alone and putting a complete engine management system in to meet the needs of the motor.
the facts are if you need to go out and ask questions on a forum like this you are a zillion miles away from being able to deal with the dailey needs of a aftermarket blown motor. even the most complete turbo/supercharger kits need someone with a great sence of what needs to be watched and what needs to be checked and adjusted all the time to live.
just my opinion...but then again I have owned a kawasaki TC31000,a dinan turbo 325iS,vortech V1 in same 325iS,740tivolvo in a 120s,rimmer sc'd outback and set up a number of other blown rides for friends. |
jim
| | Posted on Tuesday, October 29, 2002 - 10:12 am: |
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I agree if you are going to supercharge you need to make sure you do it right and take all the precautions. When I did my system I also did other work to it. I have 100k on my disco and still running strong. 97 D1. The Rimmer kit is not the best. I did some machine work and some modification to the kit. Other than the oil change every 3k no "daily needs" of the Supercharged motor. No oil leaks. I run Redline synthetic every 3k. OME HD lift and 245 75 16 stock gear ratio, Borla and I can still outrun a RR 4.6 and the new 03 DIIa 4.6. But if I had the choice to do it again and had to pay for my Supercharger I would opt for the motor upgrade. Especially for the cost. JMHO |
Bill Bettridge (Billb)
| | Posted on Tuesday, October 29, 2002 - 10:34 am: |
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In addition to what Musky mentioned - there are also stand alone management systems that will work with factory ECU and monitor O2 sensor readings and will rich/lean the mixture as necessary realtime. This is important for all - but especially the 3.9/4.0 -
Bill |
muskyman
| | Posted on Tuesday, October 29, 2002 - 05:16 pm: |
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bill, yep no doubt there...oh yea that brings up that the fact all this new found air needs to exit the motor!
now you are back to exhaust...another area the disco 3.9/4.0 is all maxed out stock. so now you need a real header/cat/exhaust system to set up if you plan on any real gains from your pricey blower/ECU combination.
fact is if you are this far down the rabbit hole you really wish you'd taken the blue pill |
Roland Kutasi (Disco1)
| | Posted on Wednesday, October 30, 2002 - 06:27 am: |
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Greetings from Oz!
I have a stroked 4.7 litre 95 Disco that is supercharged as well as a 1991 Disco fitted with a 4.6 litre hi compression TVR RR engine.
The 4.7 was initially fitted with a Rimmer M62 unit which I was not overly happy with, because not being intercooled it caused 'pinking' up in the rev range and I didn't fancy one day picking up pieces of the motor in a bucket. The rimmer unit was replaced with a vortech V2 with intercooling and the whole system is controlled by a Motec Pro M48 management system which does away with the O2 sensor and controls all the electrical and fuelling requirements. Here's my comments on supercharging.
Don't supercharge without intercooling. Direct drive units such as Eaton, Whipple etc are difficult to intercool without first ceramic coating the supercharger and manifold to cut down on heat transfer which normally heats up the already hot air created by the supercharger and creates pre detonation which will destroy you engine eventually. You could use water injection. Boost from a direct drive SC is instantaneous but usually only around 5 psi max and if you try to increase it by fitting a smaller pulley you'll stuff the blower.
The centrifugal/turbo supercharger such as Vortech, Procharger, Paxton etc can easily be intercooled but exibit lag. You can run with boost pressures up to 10 psi without having to fit forged pistons.
Basically, to really set up a supercharged system on any vehicle these days and to do it properly cost big $$$$$
The cheapest alternative with less headaches is fit a factory 4.6
Just my 2 cents worth.
Roland |
Paul T. Schram (Paulschram)
| | Posted on Wednesday, October 30, 2002 - 09:02 am: |
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Sounds like the SBC conversion might be easier and cheaper, in spite of the inherent problems with engine swaps.
I wonder what Mike Slade's comments would be.
Paul |
Roland Kutasi (Disco1)
| | Posted on Thursday, October 31, 2002 - 05:01 am: |
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Hi Jim,
I didn't know rimmer made a kit to suit the Eaton M90 or did you purchase the M90 and modify the base plate to suit? Just curious!
Roland |
jim
| | Posted on Thursday, October 31, 2002 - 12:43 pm: |
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They made a kit with the m90. But I did get the ports on the bottom of the SC modified.
Jim |
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