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  1. #1
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    2 out of 2 members liked this post. Reputation: Yes | No

    GT3 4.0 Liter vs 3.8 RS Dyno

    From a 6speedonline member: Both dyno'd same week same dyno


    Took the 4.0 to TopSpeed Motorsports this afternoon to see what the stock numbers were on it. With 500 miles on the clock I know it is a little early to put the numbers out there but it came back pretty good. 457 rwhp and 325 ft lbs of torque were the peak numbers. Did 4 runs and the last 3 were within 4 rwhp of each other. Will post a chart as soon as I get it emailed to me.

    Updated the post a little bit. Now we have the dyno chart that compares a stock 3.8 to the 4.0. Both
    cars
    were dynoed on the same dyno on different days but within the same week

    Click here to enlarge
    Current:
    14 Viper TA
    Wsir - 1:28:9
    Buttonwillow C13 - 1:54:1

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    I know they are both uncorrected but impressive #s
    Current:
    14 Viper TA
    Wsir - 1:28:9
    Buttonwillow C13 - 1:54:1

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    Holy crap, those are awesome numbers to the wheels. Gotta love such low drivetrain loss about 10%
    Burger Motorsports
    Home of the Worlds fastest N20s, N54s, N55s, S55s, N63s, and S63s!

    It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.

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    457 STOCK? Click here to enlarge

    Click here to enlarge

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    Click here to enlarge Originally Posted by DD GT3 RD Click here to enlarge
    I know they are both uncorrected but impressive #s
    Says STD correction.

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    Porsche 997 GT3 RS 3.8 liter versus GT3 RS 4.0 on the dyno - 419 vs. 457 rear wheel hp + highest specific output list

    We bow down in respect to Porsche. This is some of the most impressive factory stock specific output we have ever seen. To hit over 100 wheel horsepower (not crank horsepower) per liter is a feat we have not seen many factory stock motors over 4.0 liters accomplish with the F430 Scuderia being the only other one in recent memory with 459 wheel from its 4.3 liter. 457 wheel horsepower in STD correction from a 4.0 liter flat-6 is absolutely absurd and this is by far the most powerful production naturally aspirated six cylinder the world has ever seen.

    The 997 GT3 RS 3.8 hits 116.38 wheel horsepower per liter. The 4.0 hits 114.25 wheel horsepower per liter. The F430 Scuderia is at 106 wheel per liter. The GT3 RS is rated at 125 crank horsepower per liter but that crank ratings even looks conservative to us.

    How about that the GT3 RS 4.0 is making just over 100 horsepower at the wheels more than an E92 M3 4.0 liter V8? Same displacement, two less cylinders, and 100 more at the wheels. Ladies and gentlemen, that is some of the most impressive engine building the world has ever seen from a production naturally aspirated six cylinder motor. Porsche squeezed out a ridiculous amount of power and 4.0 owners are certainly getting their monies worth. We do not have enough superlatives to bestow on Porsche, phenomenal.

    Click here to enlarge

    Click here to enlarge

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Says STD correction.
    oh, I dont know much about std and sae. For some reason on the forum they were asking for SAE and someone said they were both uncorrected.


    All I know is 457 rwhp is solid for 500 crank, as well as 419 for 450 crank
    Current:
    14 Viper TA
    Wsir - 1:28:9
    Buttonwillow C13 - 1:54:1

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    Click here to enlarge Originally Posted by DD GT3 RD Click here to enlarge
    oh, I dont know much about std and sae. For some reason on the forum they were asking for SAE and someone said they were both uncorrected.


    All I know is 457 rwhp is solid for 500 crank, as well as 419 for 450 crank
    457 out of that motor is absurd.

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    The 458 V8 is absurb as well. 562hp out of a 4.5L NA motor, good sh*t.


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    Click here to enlarge Originally Posted by M3_WC Click here to enlarge
    The 458 V8 is absurb as well. 562hp out of a 4.5L NA motor, good sh*t.
    When you look at the 458's rwhp it doesn't make any more power than the GT3 4.0 RS. That is a BIG deal.

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    When you look at the 458's rwhp it doesn't make any more power than the GT3 4.0 RS. That is a BIG deal.
    Has there been anymore dynos of the 458 besides that one from Fabspeed.


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    Click here to enlarge Originally Posted by M3_WC Click here to enlarge
    Has there been anymore dynos of the 458 besides that one from Fabspeed.
    Nope. But i think it should put down more than 450whp that fabspeed showed. F430 puts down around 400whp, 458 should make around 470-80whp.

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    Click here to enlarge Originally Posted by M3_WC Click here to enlarge
    Has there been anymore dynos of the 458 besides that one from Fabspeed.
    Not that I can find.

  14. #14
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    Click here to enlarge Originally Posted by Sorena Click here to enlarge
    Nope. But i think it should put down more than 450whp that fabspeed showed. F430 puts down around 400whp, 458 should make around 470-80whp.
    The F430 puts down more than 400 whp and the Scuderia puts down more than this 458 dyno.

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    Good job Porsche! Wonder how that motor would react with a bit of boost through it....

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    1 out of 1 members liked this post. Reputation: Yes | No
    A buddy of mine got a GT3 over Christmas and took me for a ride last week. He has had it out to a few track days at Sebring and is feeling pretty confident, but I have to admit that car works very well. His intent was to impress me, and the car did a pretty good job. With the Michelin Cup tires that car sticks like glue and he was not afraid to throw the car into the turns at all. The engine is really strong and the gearbox allows you to keep the revs right where the engine wants to be. Add to that brakes that are ready to throw you through the windshield and it is quite the carnival ride.

  17. #17
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    Click here to enlarge Originally Posted by SlicktopTTZ Click here to enlarge
    Good job Porsche! Wonder how that motor would react with a bit of boost through it....
    I dream about this scenario...

    What about a centri blower on it? Imagine, would make the E46 M3 look like junk. E92 M3 too.

  18. #18
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    I dream about this scenario...

    What about a centri blower on it? Imagine, would make the E46 M3 look like junk. E92 M3 too.
    Yep. What comp ratio? Even 6psi would be nice....

    I always imagine twin-turbo GT3s.... or a GT2 RS with a better/high-revving valve-train....

  19. #19
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    Click here to enlarge Originally Posted by SlicktopTTZ Click here to enlarge
    Yep. What comp ratio? Even 6psi would be nice....

    I always imagine twin-turbo GT3s.... or a GT2 RS with a better/high-revving valve-train....
    A turbo setup would be nice too.

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    1 out of 1 members liked this post. Reputation: Yes | No
    Hello everyone, long time.
    The 4.0 RS is one impressive car. It has incredible grunt for an NA motor and of course all the motorsport characteristics of the GT3RS.

    Now stay tuned for upcoming developments on a "covert" engine build. This time it will be done by a reputable company with proven results, capabilities and know how :-)
    Many total car components are being address in the entire project, ie. gearbox, diff, suspension, brakes, body panels (goal ~ 2,800 lbs) and of course a bore & stroke engine build.
    This is gonna be fun!

    Ranger

  21. #21
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    Click here to enlarge Originally Posted by Lock n Load Click here to enlarge
    Now stay tuned for upcoming developments on a "covert" engine build. This time it will be done by a reputable company with proven results, capabilities and know how :-)
    Many total car components are being address in the entire project, ie. gearbox, diff, suspension, brakes, body panels (goal ~ 2,800 lbs) and of course a bore & stroke engine build.
    This is gonna be fun!
    Is this for your GT3?

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    1 out of 1 members liked this post. Reputation: Yes | No
    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Is this for your GT3?
    Yes it is :-) ... my 997.1 GT3RS.

    Ranger (Sua Sponte)

  23. #23
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    Click here to enlarge Originally Posted by Lock n Load Click here to enlarge
    Yes it is :-) ... my 997.1 GT3RS.

    Ranger (Sua Sponte)
    You getting the Sharkwerks motor?

  24. #24
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    You getting the Sharkwerks motor?
    No it is not a Sharkwerks kit.
    This is a Champion Motorsport build

  25. #25
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    Click here to enlarge Originally Posted by Lock n Load Click here to enlarge
    No it is not a Sharkwerks kit.
    This is a Champion Motorsport build
    Custom build?

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