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Moss Supercharger

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I was waiting to hear myself. Surely there must be quite a few installed by now. They made some pretty tall claims about the power gain....
 
Well, the claims are not wild at all. They're using an Eaton M62 which is the proper size for the 2.5 litre engine. Most of these kits will put out 6 psi of boost, which on any engine is good for a 40-50% increase in power...which is what they are claiming. I have an Eaton M45 on my 1.6 Miata running at 6 psi, and I got an increase from 90 rwhp to 130 rwhp. That's a 45% bump.
 
TR6BILL said:
pretty <u>tall</u> claims about the power gain....
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Tall, not wild. I believe they claim 50% increase in power on an otherwise stock engine. What happens when you increase the CR, put in a cam and....

And, how does the TR engine hold up with the boost?

Good questions. Does anyone on the forum have one yet.
Tinster?
 
No experience with a TR but I had one on my 1.8l Miata. I never put the car on a dyno but the stopwatch times for 0 - 60 showed a pretty big improvement. I was running about 5.5 psi boost. I also had to run a knock sensor and / or retard the timing using 93 octane gas. I would worry about what you might have to do to avoid knocking if you had raised the compression ratio but on a stock engine it probably works fairly well.

Bryan
 
I'd be really concerned about putting that kind of power on a 30+ year old engine, without doing some serious overhaul work and beefing up of the bottom end.

Then....you could have a major screamer.

Good bye clutch and differential.....
 
The local British car shop has one installed on a TR250. The car is in good un-restored condition but getting a little long in the tooth. But I got to ride in it and it was very spirited. They drive it pretty hard and have had no ill effects. This was at over 5000ft so it would have even better results at lower elevations.
 
Brosky said:
I'd be really concerned about putting that kind of power on a 30+ year old engine, without doing some serious overhaul work and beefing up of the bottom end.
Click to expand...

That is a very good point, adding extra stress to any older engine will just accelerate the wear. Which is probably covered in Moss' "limited warranty" that you have to request separately.

Just about any engine out there can take a 6-8psi boost from a supercharger as long as its in good shape. The stock bottom end of the TR6 engine is plenty strong for that amount of boost. It can actually take a lot more boost than the Moss kit offers before you have to worry about it failing. The big weakness of the stock TR6 is more RPM related (long crank and only four main bearings). Turn up the 'wick' a bit over the standard 'kits' and you venture into newer territory.

Raising compression on a supercharged car is tantamount to suicide for the engine without the sophisticated timing and engine management systems to control knock. The supercharger is already stuffing more air into the cylinder than would normally be there so the compression is already effectively increasing with the boost. And yes, a supercharged car is more sensitive to gasoline octane than a non-supercharged engine.

Big cams on forced induction engines are also detrimental to performance. Where the overlap of exhaust and intake valves being open at the same time will help a naturally aspirated engine, on a forced induction engine it sends a bunch of your boost right out the exhaust port.

The draw of a supercharger over the cam/compression/ extra carburettor routine that some of us have done (guilty /bcforum/images/%%GRAEMLIN_URL%%/blush.gif ) is the ability to have a decent and docile idle and very easy drive-ability at lower rpm and the extra power when you stab the loud pedal. /bcforum/images/%%GRAEMLIN_URL%%/driving.gif I still prefer my lumpy idle and loud bark when I succumb to the red mist and 'gently' press my volume control lever. /bcforum/images/%%GRAEMLIN_URL%%/cheers.gif
 
crj7driver said:
The local British car shop has one installed on a TR250. The car is in good un-restored condition but getting a little long in the tooth. But I got to ride in it and it was very spirited. They drive it pretty hard and have had no ill effects. This was at over 5000ft so it would have even better results at lower elevations.
Click to expand...

Those guys don't take it easy on the car either. They 'demonstrate' it properly. /bcforum/images/%%GRAEMLIN_URL%%/driving.gif
 
The advertised hp is 118 at the rear wheels, an increase of 39hp over stock, that doesnt sound very impressive to me for the cost of $3500, and with shipping that comes out to almost $95 per 1-hp.-----Although It would look and sound impressive.
 
Do a "google" for supercharged Tr6's. I pulled up a number of sites a while back. Seems that several people have gotten superchargers on their cars for about 2 grand less.

Moss is Moss. Good and Bad..
 
39 Hp for $3500.00 might be a little high BUT you can always take it off and put it on the next car or sell it.

Try that with a cam and compression...
 
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