RPI exhaust and dyno today
11-18-2009, 09:28 AM
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My Ride: SOLD...Jet Black 2008 550i M Sport with SAT, black interior. RPI exhaust and air scoop, 35% huper optik tint all around, CF roundels, flat black kidneys, Springfield Armory XD-40 jet black in glove box, charcoal filter removed.
Can't wait. You'll love the exhaust, I know that.
Congrats!!!
Congrats!!!
11-18-2009, 09:46 AM
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Originally Posted by DMS11' post='1057522' date='Nov 18 2009, 01:27 PM
I'm going to be installing the RPI exhaust from Trinity and do a before and after dyno on my 550i today. Will post results later. 
11-18-2009, 07:01 PM
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Well I finally got it installed and dynoed. Wow the exhaust sounds awesome! I listened to all the clips but it sounds so much better in person. I love my car now. This is how a V8 should sound! As for the performance, I was surprised that it actually gives pretty good performance gains just from an axleback. My car stock was around 275 hp and 305 tq and with exhaust peak hp was 295 and torque was 310. Mostly at higher rpm's. I can't wait to drive my car now. It's like getting a brand new car. Thanks to Trinity and Dyno-Comp. 
11-18-2009, 07:52 PM
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Originally Posted by turboawd' post='1058051' date='Nov 18 2009, 08:13 PM
i dont like the fact you lose so much torque off the line. but if its the sound you like, then go for it.
For what it's worth, the first several hundred or so RPM's is not generally considered reliable data, because that's where the throttle is being rolled in. Minor changes in how the dyno operator throttles in may change how the first section of the graph will look.
Only after the throttle has been fully opened and the roller dyno inertia and/or eddy current is providing useful resistance is measurement really very useful.
11-18-2009, 08:42 PM
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My Ride: 2006 BMW 550i
Originally Posted by NobleForums' post='1058070' date='Nov 18 2009, 10:52 PM
For what it's worth, the first several hundred or so RPM's is not generally considered reliable data, because that's where the throttle is being rolled in. Minor changes in how the dyno operator throttles in may change how the first section of the graph will look.
Only after the throttle has been fully opened and the roller dyno inertia and/or eddy current is providing useful resistance is measurement really very useful.
Only after the throttle has been fully opened and the roller dyno inertia and/or eddy current is providing useful resistance is measurement really very useful.
11-18-2009, 08:46 PM
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Originally Posted by DMS11' post='1058045' date='Nov 18 2009, 11:01 PM
Well I finally got it installed and dynoed. Wow the exhaust sounds awesome! I listened to all the clips but it sounds so much better in person. I love my car now. This is how a V8 should sound! As for the performance, I was surprised that it actually gives pretty good performance gains just from an axleback. My car stock was around 275 hp and 305 tq and with exhaust peak hp was 295 and torque was 310. Mostly at higher rpm's. I can't wait to drive my car now. It's like getting a brand new car. Thanks to Trinity and Dyno-Comp.