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The n54 isnt the only car limited up top by its twin turbos
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09-04-2012, 11:47 AM | #1 |
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The n54 isnt the only car limited up top by its twin turbos
Here is the results from my custom tune from AMS on my 997.1 Turbo. You can see what the engine can do down low similar to the n54 but with limited results up top.
Stock the 911 turbo generates 480 hp and 505 tq at the crank. Stock power expected after exhaust - 498 hp and 521 tq. So the baseline appears reasonable at 16% loss for an all-wheel drive car. The car pulls north of .9 gs through 100mph. Feels amazing. Thanks AMS for everything.
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2015 - Cayman GTS - Stock
2011 - 335is e92 - Cobb PTF E40/Rob - Beck/AR/Helix (458 rwtq and 479 rwhp) - Retired 2007 - 911 Turbo - EP1/AMS (617 awtq and 500 awhp) - Retired 2008 - 335i e92 - Cobb/AR/Helix/OSS (384 rwtq and 356 rwhp) - Retired |
09-04-2012, 11:57 AM | #2 |
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This is not surprising. Virtually every single stock turbocharged car is limited in upper RPM ranges because auto mfgs place a higher priority on boost response over ultimate all out power, hence the use of smaller turbos.
BMW seems to be trying to change this paradigm with turbocharged M-cars that can pull hard to redline. However, once you start turning up the boost in those cars, you will still run out of steam in the upper RPM range. I guess it's very similar to your Porsche where the stock tune makes max power at or near redline, but when you turned up the boost, there's not as much that can be gained in the upper RPM range compared to the lower RPMs. |
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09-04-2012, 12:19 PM | #3 |
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The new tri-turbo M3/M4 will have two VATN turbine nozzles, which should eliminate the high RPM choking. Same with the diesels, but those don't rev that high. The straight 6 will be rev limited based on stroke and crankshaft harmonics, anyway.
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09-04-2012, 10:26 PM | #5 | |
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09-04-2012, 10:45 PM | #6 | |
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09-05-2012, 07:05 AM | #7 |
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617wtq. Gotta love Porsches! PS...the Sachs clutch setup is great, and you will certainly need it soon, if not already
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09-05-2012, 08:54 AM | #8 | |
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Alpina_B3_Lux
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Audi R8 LMX, BMW M550i xDrive (G30 LCI); gone: Alpina B3 3,3 (E46), BMW 335i, Audi R8 V10 manual, Audi R8 V10, BMW M235i, BMW 550i F10
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09-05-2012, 09:00 AM | #9 |
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The turbine (exhaust side) has vanes around the turbine wheel that can pivot to push more or less exhaust against the turbine. At low RPMs, the vanes are moved to push gasses against the turbine, and at higher RPMs, the vanes pivot away to allow more exhaust gas flow without choking the engine down, which is where a small stock-style turbo chokes the engine out. So you get great boost response and higher boost pressures at low RPMs, less choking at high RPMs.
There was a video on the BMW tri-turbo diesels that shows computer graphic cutaways of the system working with the VATN turbos.
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09-05-2012, 09:13 AM | #10 |
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really cool
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07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
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09-05-2012, 09:32 AM | #11 |
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Already shopping around.
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2015 - Cayman GTS - Stock
2011 - 335is e92 - Cobb PTF E40/Rob - Beck/AR/Helix (458 rwtq and 479 rwhp) - Retired 2007 - 911 Turbo - EP1/AMS (617 awtq and 500 awhp) - Retired 2008 - 335i e92 - Cobb/AR/Helix/OSS (384 rwtq and 356 rwhp) - Retired |
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09-05-2012, 09:32 AM | #12 |
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Now that is awesome. Seems so simple when you watch the video.
Can't wait to see what a "tuned" next gen M3 will put out.
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2008 E92 335i M-Sport | Sapphire Black | Sunroof | Creme Beige | Poplar Grey | Logic 7 | 6AT | 19" AG M359's | Michelin PS4S | LUX V3 | MHD V5 E40 | Steve AZ Walbro inline | Vishnu DCI | BMS CP | AR Design Catless DP's | Forge DV's | Helix IC | (Stock Cat. back) |
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09-05-2012, 10:30 AM | #13 | |
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I actually just started shopping for a 997.1 to replace my 335i. Low mileage cars can be had for 70-80k, which seems reasonable for a relatively reliable entry level Super Car. How has your experience been, going from a modded 335i to the P-Car? |
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09-05-2012, 11:47 AM | #14 |
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PS, have you considered doing e85? My buddy who just picked up a 997.1 TT is supposedly getting the Protomotive e85 setup, and claims that the power made by e85+stock turbos is equal to upped VTGs on 93. Just curious if that was in the cards.
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09-05-2012, 11:55 AM | #15 | |
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nice numbers op
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09-05-2012, 11:58 AM | #16 |
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Here is a write up I did comparing the two.
http://www.e90post.com/forums/showthread.php?t=694095 With more time behind the wheel, I am still in love with the car. The acceleration is brutal. AWD makes so much difference, there is no wasted power at low speeds. Some negatives. The cost to modify are staggering compared to the n54. The car is obviously on a diet compared to the 335i. It weighs 10% less than the 335ix and chunk of that saves comes from sound reduction materials. Its not a noisy car, but its not quiet like the 335i. Only changed the oil once for about $250.
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2015 - Cayman GTS - Stock
2011 - 335is e92 - Cobb PTF E40/Rob - Beck/AR/Helix (458 rwtq and 479 rwhp) - Retired 2007 - 911 Turbo - EP1/AMS (617 awtq and 500 awhp) - Retired 2008 - 335i e92 - Cobb/AR/Helix/OSS (384 rwtq and 356 rwhp) - Retired |
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09-05-2012, 12:01 PM | #17 | |
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Also, I am already getting only 15mpg. With E85, I would be at the pumps every other day.
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2015 - Cayman GTS - Stock
2011 - 335is e92 - Cobb PTF E40/Rob - Beck/AR/Helix (458 rwtq and 479 rwhp) - Retired 2007 - 911 Turbo - EP1/AMS (617 awtq and 500 awhp) - Retired 2008 - 335i e92 - Cobb/AR/Helix/OSS (384 rwtq and 356 rwhp) - Retired |
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09-05-2012, 02:11 PM | #18 |
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Why the wavy dyno plots?
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09-05-2012, 02:31 PM | #19 |
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Smoothing is at 3, less than the 5 most folks are use too.
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2015 - Cayman GTS - Stock
2011 - 335is e92 - Cobb PTF E40/Rob - Beck/AR/Helix (458 rwtq and 479 rwhp) - Retired 2007 - 911 Turbo - EP1/AMS (617 awtq and 500 awhp) - Retired 2008 - 335i e92 - Cobb/AR/Helix/OSS (384 rwtq and 356 rwhp) - Retired |
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09-05-2012, 02:45 PM | #20 |
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We are doing a flexfuel kit on our shop 997tt
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09-05-2012, 02:46 PM | #21 |
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Upgraded fuel system needed so far on yours? What type of numbers are you getting?
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2015 - Cayman GTS - Stock
2011 - 335is e92 - Cobb PTF E40/Rob - Beck/AR/Helix (458 rwtq and 479 rwhp) - Retired 2007 - 911 Turbo - EP1/AMS (617 awtq and 500 awhp) - Retired 2008 - 335i e92 - Cobb/AR/Helix/OSS (384 rwtq and 356 rwhp) - Retired |
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