Manthey 3.9 RS w Videos
10-01-2010, 12:51 PM
#3
The Web site lists the parts -- it includes the headers and cats, but (sadly) retains the factory side and rear cans.
I'm not convinced by these numbers:
"
Factory: 3.6L Engine - 370 hp at the wheels (415hp at the crankshaft)
Tuned: 3.9L Engine - 420hp at the wheels (495hp at the crankshaft)
"
The factory has a 45hp drivetrain loss and the 3.9 has 75hp loss? 89.16% vs 84.49% or a 11% loss factory but a 15% loss by a 300cc increase in displacement?
I'm not convinced by these numbers:
"
Factory: 3.6L Engine - 370 hp at the wheels (415hp at the crankshaft)
Tuned: 3.9L Engine - 420hp at the wheels (495hp at the crankshaft)
"
The factory has a 45hp drivetrain loss and the 3.9 has 75hp loss? 89.16% vs 84.49% or a 11% loss factory but a 15% loss by a 300cc increase in displacement?
10-01-2010, 01:06 PM
#4
Admin
Lifetime Rennlist
Member
Lifetime Rennlist
Member
What is mentioned above is probably wrong these are the proper specs and number for 997.1 GT3/RS
3.9L kit aka 450kit
+35HP /NM includes pistons,liners,gaskets,cats,sparks,dme tuning.
they also have a 4.1L kit with the above and conrods +65HP/NM aka 480kit
John
3.9L kit aka 450kit
+35HP /NM includes pistons,liners,gaskets,cats,sparks,dme tuning.
they also have a 4.1L kit with the above and conrods +65HP/NM aka 480kit
John
10-01-2010, 07:47 PM
#5
Rennlist Member
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.
10-01-2010, 08:29 PM
#7
Rennlist Member
Trending Topics
10-02-2010, 11:10 AM
#8
Rennlist Member
Does anyone in the Dallas area (or Texas) have a SharkWerks 3.9? If so, PM me. We can meet at Eagles Canyon Raceway, and I can bring you as a guest (my treat).
10-02-2010, 11:37 AM
#9
I don't know that we need to revisit the Carrera GT discussions around 0-100-0 or -200-0, but it would be an interesting (if dangerous and far from scientific) comparison. Maybe one of the magazines or Top Gear/5th Gear has the resources to get a few 911's together -- especially the current 3.6 and 3.8 RS in factory stock trim as baselines for the various 3.9 and rumored factory hot rods.
10-02-2010, 02:22 PM
#10
Rennlist Member
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.
10-02-2010, 04:10 PM
#11
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.
Anyway, your question prompted me to go find the Sharkwerks product page:
http://www.sharkwerks.com/products.php?pid=258
And the main chart:
The lower plot is a 3.6, no slouch, but not in the same league as the new RS with the 3.8 in terms of power and torque over 6800 rpm +/- ... and one could argue there's at least a little bit of ram induction on the new engine cowl.
10-02-2010, 06:24 PM
#12
Rennlist Member
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.
10-02-2010, 10:39 PM
#13
Rennlist Member
Looks like the peak power is developed at around 8k rpm and then continue to make power up to 8,800rpm.. would be interesting to see the Manthey curves for comparison. Of course, one can always "short shift" (if you can say shifting at 8k as "short shift") to save the engine.. having the extended "head room" is not a bad thing. You don't have to use it, but it is there for the taking when you want it. (to keep the power in higher power band when upshifting, etc.) Hey, like when you are racing for pinks.. :P
10-03-2010, 12:28 AM
#15
Rennlist Member
