Manthey 3.9 RS w Videos
10-04-2010, 03:45 PM
#31
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One more point about the Manthey 3.9: They promise 450 hp on an engine dyno. That is the minimum, but my car feels far stronger than 450 hp. Very few companies have access to an engine dyno.
Chassis dynos results can vary widely, based on a number of variables. and measure power to the wheels. Any calculation to estimate engine power is just that; an estimate.
The Sharkwerks 3.9 is also very impressive, and as Carrera GT said, the sustained power to 8800 rpm is outstanding.
Chassis dynos results can vary widely, based on a number of variables. and measure power to the wheels. Any calculation to estimate engine power is just that; an estimate.
The Sharkwerks 3.9 is also very impressive, and as Carrera GT said, the sustained power to 8800 rpm is outstanding.
10-04-2010, 03:51 PM
#32
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True but only RS tuning uses engine dyno Manthey uses a Maha rolling dyno with at least proper cooling and funs.
The 450 they quote is on their dyno not on an engine one, however I thing their kit would make 450 on an engine dyno because its fairly similar to the RS tuning kit.
John
The 450 they quote is on their dyno not on an engine one, however I thing their kit would make 450 on an engine dyno because its fairly similar to the RS tuning kit.
John
10-04-2010, 06:31 PM
#33
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True but only RS tuning uses engine dyno Manthey uses a Maha rolling dyno with at least proper cooling and funs.
The 450 they quote is on their dyno not on an engine one, however I thing their kit would make 450 on an engine dyno because its fairly similar to the RS tuning kit.
John
The 450 they quote is on their dyno not on an engine one, however I thing their kit would make 450 on an engine dyno because its fairly similar to the RS tuning kit.
John
10-04-2010, 09:28 PM
#34
Perhaps someone has done a comparison of the parts and spec's for each of the engines. If ever there was a business where the devil is in the details, it's in performance engine building. A valve spring here, a cam lobe there and you've got two very different apples.
To stray off topic, I'm sure it's well within the realms of marketing that a rumored "4.0" engine in a "limited edition" GT3 RS could well be something much less than 4.0 litres. Perhaps as little as 3.90 (or whatever some of these various 3.9's measure.) Have the vendors of the 3.9's and 4.0's and 4.1's (or whatever) pulled out the pipette and published exact volumes? Ironically, if Porsche delivers on this rumored 4.0, I'd be happier to find it's really a 3.9x (in terms of strength) than to find they've gone too far into the bore or turned it into a cranking stroker that doesn't have the same excitement and energy at 8800 rpm. If anything, I'd prefer to have them deliver another 3.8, but take it to 10K rpm and deliver 500 horses all whinnying up on high doh. I guess that's not saying much -- who'd prefer a narrower power band?
To stray off topic, I'm sure it's well within the realms of marketing that a rumored "4.0" engine in a "limited edition" GT3 RS could well be something much less than 4.0 litres. Perhaps as little as 3.90 (or whatever some of these various 3.9's measure.) Have the vendors of the 3.9's and 4.0's and 4.1's (or whatever) pulled out the pipette and published exact volumes? Ironically, if Porsche delivers on this rumored 4.0, I'd be happier to find it's really a 3.9x (in terms of strength) than to find they've gone too far into the bore or turned it into a cranking stroker that doesn't have the same excitement and energy at 8800 rpm. If anything, I'd prefer to have them deliver another 3.8, but take it to 10K rpm and deliver 500 horses all whinnying up on high doh. I guess that's not saying much -- who'd prefer a narrower power band?
10-05-2010, 09:11 AM
#35
What's the redline on the Manthey 3.9?
I know the Sharky's 3.9 revs up to 8,800rpms. That's very high. Where's the peak power developed?
Would be interesting to compare that w/ where the Manthey's power band.
The stress of the engine is proportional to the square of the rpm, so if one engine has to revved very high to keep the power flowing, and the other engine has a different characteristic.. there might be difference when it comes to long term reliability / service interval.
Just a thought. I am not saying that it is the case w/ the Sharky's engine at all. But it is interesting on its approach, vs. other shops that does 4.0L conversion (but keep the stock rev ceiling), for example.
I know the Sharky's 3.9 revs up to 8,800rpms. That's very high. Where's the peak power developed?
Would be interesting to compare that w/ where the Manthey's power band.
The stress of the engine is proportional to the square of the rpm, so if one engine has to revved very high to keep the power flowing, and the other engine has a different characteristic.. there might be difference when it comes to long term reliability / service interval.
Just a thought. I am not saying that it is the case w/ the Sharky's engine at all. But it is interesting on its approach, vs. other shops that does 4.0L conversion (but keep the stock rev ceiling), for example.
Second, what's the compression? You get about a 10% increase in power from every full point of compression. The Sharkwerks upgrade bumps compression a full point from 12.0:1 to 13.0:1 showing that most of the power increase is really from the bump in compression. If the Manthey compression is lower then don't expect as much power.
Although this is probably a decent upgrade for a 3.6l, I am not sold on it if you already have a 3.8L. Here is what my 100% stock 3.8l did without even the GMG headers they put on the 3.9l run on the exact same dyno that the Manthey car was run on:
05-26-2011, 01:36 PM
#39
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I also have a 3.9 conversion from Manthey on a 2007 GT3. It is an incredible package, and the improvement in acceleration over stock is almost hard to believe. It explodes out of the blocks, and keeps pulling and pulling and pulling. I am very happy with the conversion.
In addition to the 3.9, it includes an ECU tune, special spark plugs, a second intake (a trick piece which fits in the same location as the engine fan without removing the fan), headers, 200 cell cats, cup flywheel and a sport clutch. You can also keep your stock clutch and flywheel (I did, and your preference may wary, especially if your car is primarily a track car). It is a complete package, and I highly recommend it.
In addition to the 3.9, it includes an ECU tune, special spark plugs, a second intake (a trick piece which fits in the same location as the engine fan without removing the fan), headers, 200 cell cats, cup flywheel and a sport clutch. You can also keep your stock clutch and flywheel (I did, and your preference may wary, especially if your car is primarily a track car). It is a complete package, and I highly recommend it.
05-26-2011, 01:55 PM
#40
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05-26-2011, 02:15 PM
#41
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05-26-2011, 04:11 PM
#43
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