Maximum horsepower potential of the stock turbo, 2001 A4 1.8T
03-09-2001, 08:25 AM
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Maximum horsepower potential of the stock turbo, 2001 A4 1.8T
Stock hp on a 2001 A4 1.8T is 170hp. Adding a Stage 1 Garrett chip increases output by 40hp. How close is 210hp to the limits of the stock turbo?
At what point does the K04 turbo make sense?
At what point does the K04 turbo make sense?
03-09-2001, 08:54 AM
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Limit is same for K03s....
Hiya,
If a chip gives an increase of 40hp for the 150hp motor, you cannot assume the increase is 40hp for the 170. The Audi engineers already tapped into a little more available boost to get the new motors to 170.
There is a small power increase due to manifold changes and the greater ability of the computer to optimize engine operation in a drive-by-wire system as the 2001s have (and the TT had since inception) that do make these motors ultimately more powerful than the 99-00 and earlier.
APR indicates (in thier websites ad for these chips) this is 7hp in difference between a 99 chipped vs. a 2001 chipped, not 20.
Some here have achieved dyno figures and dragstrip numbers out of a K03 that would indicate 210-217hp. This is the K03 operating at the limits of its design, and unless you can afford to break things, it probably isn't for you.
The K03 and K04 are old turbos, used by Audi to add power to a 4cyl (2 on S4) power plant with good torque characteristics (long stroke, 5 valve) to make a level torque curve and a happy V6 like driving experience. They are not high HP turbos.
The KO4 is probably the safest way to go over 200hp with acceptable realiability for the daily driver (Audi gets 225 on the TT (Ko4) with the long warranty). However, MTM and other tuners, have limited its maximum reliable performance to 240-250 hp. Above that go APR stage 3+ or another custom set up.
My advice (IMHO):
KO3/chip, cheapest, brief runs at WOT, not for hard track workouts (190-200hp) $400, add exhuast for $450-600
K03/exhaust/chip/tandem intercooler/better BPV for a reliable, conservative 205hp. $2000
K04/exhaust/chip/intercooler/BPV for a reliable, conservative 240hp. $3000
APR stage 3+ 280-300hp $4000+
Custom set up for more. $$$$+
Hope this answers your question.
Michael
If a chip gives an increase of 40hp for the 150hp motor, you cannot assume the increase is 40hp for the 170. The Audi engineers already tapped into a little more available boost to get the new motors to 170.
There is a small power increase due to manifold changes and the greater ability of the computer to optimize engine operation in a drive-by-wire system as the 2001s have (and the TT had since inception) that do make these motors ultimately more powerful than the 99-00 and earlier.
APR indicates (in thier websites ad for these chips) this is 7hp in difference between a 99 chipped vs. a 2001 chipped, not 20.
Some here have achieved dyno figures and dragstrip numbers out of a K03 that would indicate 210-217hp. This is the K03 operating at the limits of its design, and unless you can afford to break things, it probably isn't for you.
The K03 and K04 are old turbos, used by Audi to add power to a 4cyl (2 on S4) power plant with good torque characteristics (long stroke, 5 valve) to make a level torque curve and a happy V6 like driving experience. They are not high HP turbos.
The KO4 is probably the safest way to go over 200hp with acceptable realiability for the daily driver (Audi gets 225 on the TT (Ko4) with the long warranty). However, MTM and other tuners, have limited its maximum reliable performance to 240-250 hp. Above that go APR stage 3+ or another custom set up.
My advice (IMHO):
KO3/chip, cheapest, brief runs at WOT, not for hard track workouts (190-200hp) $400, add exhuast for $450-600
K03/exhaust/chip/tandem intercooler/better BPV for a reliable, conservative 205hp. $2000
K04/exhaust/chip/intercooler/BPV for a reliable, conservative 240hp. $3000
APR stage 3+ 280-300hp $4000+
Custom set up for more. $$$$+
Hope this answers your question.
Michael
03-09-2001, 09:52 AM
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Re: Limit is same for K03s....
Thanks for the help. I had a feeling 210hp would be pushing things.
FYI, no assumption on the 40hp increase with the 170hp motor. According to AWE/GIAC a "stage 1" chip increases hp by 47 in the 150hp engine and 40hp in the 170hp engine.<ul><li><a href="http://www.awe-tuning.com">http://www.awe-tuning.com</a</li></ul>
FYI, no assumption on the 40hp increase with the 170hp motor. According to AWE/GIAC a "stage 1" chip increases hp by 47 in the 150hp engine and 40hp in the 170hp engine.<ul><li><a href="http://www.awe-tuning.com">http://www.awe-tuning.com</a</li></ul>
03-09-2001, 10:01 AM
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Re: Limit is same for K03s....
The 2001 engine has one big advantage over the previous engines -- 8.5:1 compression vs 9.5:1. This basically means that you can advance the timing a little bit more before pinging starts to occur, thus gaining some power at a given boost. I believe this to be the main reason as to why you get 210HP with the new engine and 1bar of boost w/K03 vs 197HP and 1bar of boost w/K03 in the old one.
03-09-2001, 10:16 AM
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Re: Limit is same for K03s....
Good to know. Thank you.
Like the Doc said the turbo itself is most likely at it's limits at 210. Breaking stuff is not an
option.
I would like to tweek a bit more power out (not looking for a race car) of the engine and perhaps an exhaust/intake upgrade would make more sense.
Like the Doc said the turbo itself is most likely at it's limits at 210. Breaking stuff is not an
option.
I would like to tweek a bit more power out (not looking for a race car) of the engine and perhaps an exhaust/intake upgrade would make more sense.
03-09-2001, 12:46 PM
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must be a misprint
No way Audi dropped the compression ratio by that much. The gas mileage would suffer badly. The car would also lose a ton of low end torque and flatspot badly.
If they did, you probably could go to 20+lbs of boost without pinging though.
If they did, you probably could go to 20+lbs of boost without pinging though.
