How much better does a TT accelerate?
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From: Wien, Austria
How much better does a TT accelerate?
Guys,
I have been driving my stock 993 Carrera2 since two years, mainly on the autobahn. I absolutely love the car, especially the great sound and design. However, one thing bothers me and that is acceleration in 5th gear at speeds between 180-230 km/h (that should be 110 - 140 mpH).
As a Porsche driver I want to be quicker than most, but with other makes building bigger engines all the time, this gets tougher all the time - I am not able to even pull away from a BMW 530 DIESEL!! at those speeds
Two questions, then:
1. Any mods that help me get more acceleration at above mentioned speeds?
2. How much faster is the TT compared to the regular 993 at these speeds?
Is this first step down the slippery slope?
Chris
I have been driving my stock 993 Carrera2 since two years, mainly on the autobahn. I absolutely love the car, especially the great sound and design. However, one thing bothers me and that is acceleration in 5th gear at speeds between 180-230 km/h (that should be 110 - 140 mpH).
As a Porsche driver I want to be quicker than most, but with other makes building bigger engines all the time, this gets tougher all the time - I am not able to even pull away from a BMW 530 DIESEL!! at those speeds
Two questions, then:
1. Any mods that help me get more acceleration at above mentioned speeds?
2. How much faster is the TT compared to the regular 993 at these speeds?
Is this first step down the slippery slope?
Chris
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Chris:
The speed range you mention is the "sweet spot" for the TT. It's almost silly how much speed change ability you have on tap if the turbos are spooled up! No NA car could compare, IMHO!!!
As far as your two questions...
1.) Only mod to seriously affect this might be a supercharger kit. Most other NA mods give you better throttle response or a little more bottom end pull. Best suggestion might be a closer ratio gear box setup to give you gears for those speeds within the engine power band.
2.) In a phrase..."night and day" However with the turbos, come more car to maintain. Also, the turbo is AWD and feels quite different from the driver's point of view. Many feel it is from the AWD, others the weight. It really boils down to preference. All of these cars are a blast to drive.
$0.02
The speed range you mention is the "sweet spot" for the TT. It's almost silly how much speed change ability you have on tap if the turbos are spooled up! No NA car could compare, IMHO!!!
As far as your two questions...
1.) Only mod to seriously affect this might be a supercharger kit. Most other NA mods give you better throttle response or a little more bottom end pull. Best suggestion might be a closer ratio gear box setup to give you gears for those speeds within the engine power band.
2.) In a phrase..."night and day" However with the turbos, come more car to maintain. Also, the turbo is AWD and feels quite different from the driver's point of view. Many feel it is from the AWD, others the weight. It really boils down to preference. All of these cars are a blast to drive.
$0.02
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Chris
Between 110 and 140mph , a TT would beat the Carrera by about 2-2.5 seconds, which, to put things into perspective, is about 100 mtrs. or roughly 300 ft I think . You are talking a stock TT. The TT with minor modifications can be bumped up 50 hp.
Between 110 and 140mph , a TT would beat the Carrera by about 2-2.5 seconds, which, to put things into perspective, is about 100 mtrs. or roughly 300 ft I think . You are talking a stock TT. The TT with minor modifications can be bumped up 50 hp.
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For what it's worth, do the supercharger! 100+ hp gain, no turbo lag, power anytime you want it. I was doing 80 mph in sixth gear, dropped it to fifth and poured on the gas, shifted back to sixth - more gas and I was up to 180 in no time!
If you are serious about upgrading and got the time/money... do a search on 'supercharger' and read the up's and down's of doing this install.
Driving a supercharged 993 is like nothing else........
Good Luck!
If you are serious about upgrading and got the time/money... do a search on 'supercharger' and read the up's and down's of doing this install.
Driving a supercharged 993 is like nothing else........
Good Luck!
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From: Austin, Texas
From the "seat if the pants feel", having driven both, absolutely no comparison....the TT is a beast. If you think about it, to produce a car in the 400+/400+ category back in 96 time frame was really ahead of the game a bit...there is not much on the road produced for 2004 that would outperform a 993 TT by any kind of margin...
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From: Boston, MA
Originally Posted by mr_bock
For what it's worth, do the supercharger! 100+ hp gain, no turbo lag, power anytime you want it. I was doing 80 mph in sixth gear, dropped it to fifth and poured on the gas, shifted back to sixth - more gas and I was up to 180 in no time!
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From: Down the rabbit hole
Originally Posted by nile13
I have a serious question here, as a former owner of a supercharged car. Does supercharger actually increase terminal velocity of a 993 by that much? The theory on supercharging is that their sweet spots are lower on RPM curve and at high RPM they rob more power from the engine than they develop. I'm not sure what RPM 180 miles per hour would translate to in 6th gear (I've not had mine much above 160), but somehow I have my doubts that a supercharger would be particularly efficient up there.
Terminal velocity is a function of drag and power. Raise the power for the same car and you will raise the Vmax, assuming the gearing can support it of course!
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Originally Posted by graham_mitchell
Sorry, that is far from the truth. The peak horsepower with a supercharger is much higher, and that's taking any parasitic losses into account.
Terminal velocity is a function of drag and power. Raise the power for the same car and you will raise the Vmax, assuming the gearing can support it of course!
Terminal velocity is a function of drag and power. Raise the power for the same car and you will raise the Vmax, assuming the gearing can support it of course!
That's why I'm curious what a 993 would be spinning at 180 miles per hr.
In my supercharged MR2 a solenoid clutch would disconnect a superharger at higher RPM. That car had a 7500 redline. Is there a similar clutch in 993 applications?
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From: Down the rabbit hole
Originally Posted by nile13
Ah, Graham, but the gearing remains the same as it was in NA car. If supercharged car now produces more HP but at the lower RPM and quickly loses efficiency, say, above 5-5.5K, what do we have vis. a vis. terminal velocity?
That's why I'm curious what a 993 would be spinning at 180 miles per hr.
In my supercharged MR2 a solenoid clutch would disconnect a superharger at higher RPM. That car had a 7500 redline. Is there a similar clutch in 993 applications?
That's why I'm curious what a 993 would be spinning at 180 miles per hr.
In my supercharged MR2 a solenoid clutch would disconnect a superharger at higher RPM. That car had a 7500 redline. Is there a similar clutch in 993 applications?
However, that is not the case. The power with the supercharger is well in excess of the NA power until redline.
Here's Sachin Misra's power at the wheels after installation of TPC kit: (to the right)
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From: Down the rabbit hole
Originally Posted by jean
Based on my calculations, a Carrera US, about 6,950 RPMs, a ROW Carrera around 6,750RPMs. I don't remember where the rev limiter is set on N/A 993s but it could be that you will never see those speeds on a US car unless you change your gear ratios or push the rev limiter.
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From: yorba linda, ca
An aero drag reduction would yield leveraged results of approximately 4:1 at lbs of drag vs.hp
Buuuut, since aero development is limited (mostly) to wind tunnel testing, effective aero tweaks are difficult to implement. So HP it is
In short, I guess your stuck with a TT
Buuuut, since aero development is limited (mostly) to wind tunnel testing, effective aero tweaks are difficult to implement. So HP it is
In short, I guess your stuck with a TT
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From: Chicagoland
A supercharged engine will have much more torque in the bottom end than a turbo if it is setup properly. The response is quick and smooth. Now, you can setup the map on the computer to give you a better highend, but I prefer the power to be on the lower band. To give you an idea of the low end power, here are some stats from a few days ago on a nice brisk Chicago day with my supercharged 3.4 996.
0 - 60 4.01 seconds
0 - 102 9 seconds
0 - 122 12.03 seconds
0 - 131 14.97 seconds
This was with street tires on local road without breaking the wheels. Experience has shown me that the TT cannot keep up with me up to 100 -110, but starts pulling much stronger than I do above that speed. I prefer to have the lower end power because I use it more around town than I would the higher speeds.
0 - 60 4.01 seconds
0 - 102 9 seconds
0 - 122 12.03 seconds
0 - 131 14.97 seconds
This was with street tires on local road without breaking the wheels. Experience has shown me that the TT cannot keep up with me up to 100 -110, but starts pulling much stronger than I do above that speed. I prefer to have the lower end power because I use it more around town than I would the higher speeds.
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Originally Posted by graham_mitchell
Yes, on my ROW car the engine should be doing around 6700 rpm (if I extrapolate from indicated revs at lower speeds)