Effect From Sports Exhaust On Acceleration & Topend | FerrariChat
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Effect From Sports Exhaust On Acceleration & Topend

Discussion in 'Technical Q&A' started by Ferrari Mackintosh, Jan 16, 2005.

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  1. Ferrari Mackintosh

    Ferrari Mackintosh Formula Junior

    Sep 21, 2004
    716
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    #1 Ferrari Mackintosh, Jan 16, 2005
    I have an aftermarket exhaust (and nothing else) installed on my 512TR which apparently gives the car an extra 12 to 15 BHP, bringing it up to the same horsepower level as a 512M. Would it give me slight improvement on the 0-60MPH time and topend speed? Also, because the BHP is now the same as the 512M, will it have the same 0-60 time as that car?
     
  2. mk e

    mk e F1 World Champ

    Oct 31, 2003
    13,792
    The twilight zone
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    Help me get this thing finished! https://gofund.me/39def36c
    #2 mk e, Jan 16, 2005
    The short answer is yes, if it has the same power, it will have the same performance. The longer answer is unless you have measured the hp, assuming it's there is probably a mistake. Many products/people claim performance increases that do not exist. Also, ferrari factory numbers are often optimistic, from what I've seen, it's rare to have one that makes the claimed numbers.

    So the only real way to answer your question is for you go go out and measure the perforance numbers you are concerned about. 0-60 and 0-100 can be done easily with a g-tech that costs about $300 I think. 1/4 times at the drag strip will cost you about $20 or $30 depending where you live. It's about $100 to have the car dyno'd (the g-tech will also give you hp, but you need to know the EXACT weight of the car when you make the run for it to be right). Then you'll know, no guessing.
     
  3. vlamgat

    vlamgat Formula Junior

    Jan 9, 2004
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    #3 vlamgat, Jan 17, 2005
    The improvement represents only 2%, almost all of which is available when the engine has to breath hardest, at high rpm. Generally there are many other retarding forces at those output levels so it is very hard to see the gains claimed by these suppliers except in closed tests on a dyno. Even tire type and pressure can have more effect.
     
  4. 4i2fly

    4i2fly Formula 3

    Apr 16, 2004
    1,333
    SF, Bay Area
    #4 4i2fly, Jan 17, 2005
    This is an interesting concept which has been debated many many times...of course if you don't have dyno numbers before and after it is very hard to notice 10 - 15 change in bhp. In general lowering backpressure can help hp at the top end of the rpm range but you will sacrifice low-end rpm torque. Which means your top speed may improve but your 0-60 will suffer. It has to do with how the cams operate and the amount of overlap that exists between intake and exhaust cam. But above all by just lowering backpressure and not increasing the intake air flow you may not gain anything...

    I don't know how the TR engine works but in a 360 the engine is designed to vary the exhaust cam and intake rail to accommodate best hp and torque profile for the demand. And I would suspect since the ecu strategy is unknown, it is hard to take advantage of these add-ons unless you can accompany them with ecu tweaks.

    So I would say, enjoy the sound of your after market exhaust system and forget about any meaningful bhp increase.
     

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