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Even though I have headers, I agree with most of what has been said here. Decatted stock headers yield close to the power of after market headers. It'd be nice to see an E/H/tuned F go at it against an E/decatted/tuned F. I'd be down for that.
Supercharger ugh, much want. Maybe then we could keep up with some of the newer M's lol.
Believe it or not but I did a roll on with my buddies stock 2015 M3 6spd (I know DCT's are a little quicker) but he could not pass me until after 120mph.
We did four 20-145mph pulls, every single time, the ISF would jump out about 1 car length and hold the lead from 20-120, after 120mph though he started to pull, they have good top end. Afterwards he said he was very surprised he could not pass me until after 120mph.
My ISF at the time had only a Borla exhaust and 377whp. He's also a very good driver and very much into (road course and drag strip) with all his cars, he actually has one of the fastest record 1/4 times in his modded 135i.
Believe it or not but I did a roll on with my buddies stock 2015 M3 6spd (I know DCT's are a little quicker) but he could not pass me until after 120mph.
We did four 20-145mph pulls, every single time, the ISF would jump out about 1 car length and hold the lead from 20-120, after 120mph though he started to pull, they have good top end. Afterwards he said he was very surprised he could not pass me until after 120mph.
My ISF at the time had only a Borla exhaust and 377whp. He's also a very good driver and very much into (road course and drag strip) with all his cars, he actually has one of the fastest record 1/4 times in his modded 135i.
I think stock 2016 M3's are supposed to get 430whp on a dynojet, so keeping up with him is really good...
-Rafi
__________________
We Engineer Track Proven Upgrades For Your Lexus! SUPERCHARGERS : ECU TUNING : SUSPENSION : EXHAUST : PPE MASTER DEALER
Here's my dilemma, has anyone done this in CA and passed smog?
I heard the yes/no opinions but has anyone done it.
I want the RR tune but I'd love to capitalize on removing the exhaust restriction.
Further more as an aerodynamist I have read the entire post and can comment. Pipe flow as this is settles/goes steady state something like twice pipe diameter, if I remember correctly. The flow losses momentum going through a solid as is the CAT, you get a lot of separation in the flow (goes turbulent) which reduces efficency and causes less of the flow not to leave the pipe in a streamline manner. So not getting too technical here but they are correct, In assuming this output. Unless you have vast changes in geometry say 90deg bends instead of sweeps, the pipe will flow I'd say only a 10% percent better at best.
Then again this is without empirical data and that is all I work off of, opinions in aerodynamics are like CFD. Bull**** unless you have real data! My 2 nickels
Here's my dilemma, has anyone done this in CA and passed smog?
I heard the yes/no opinions but has anyone done it.
I want the RR tune but I'd love to capitalize on removing the exhaust restriction.
Further more as an aerodynamist I have read the entire post and can comment. Pipe flow as this is settles/goes steady state something like twice pipe diameter, if I remember correctly. The flow losses momentum going through a solid as is the CAT, you get a lot of separation in the flow (goes turbulent) which reduces efficency and causes less of the flow not to leave the pipe in a streamline manner. So not getting too technical here but they are correct, In assuming this output. Unless you have vast changes in geometry say 90deg bends instead of sweeps, the pipe will flow I'd say only a 10% percent better at best.
Then again this is without empirical data and that is all I work off of, opinions in aerodynamics are like CFD. Bull**** unless you have real data! My 2 nickels
I am always amazed by how many run headers in California...
Rafi
__________________
We Engineer Track Proven Upgrades For Your Lexus! SUPERCHARGERS : ECU TUNING : SUSPENSION : EXHAUST : PPE MASTER DEALER
Unless you have vast changes in geometry say 90deg bends instead of sweeps, the pipe will flow I'd say only a 10% percent better at best.
Then again this is without empirical data and that is all I work off of, opinions in aerodynamics are like CFD. Bull**** unless you have real data! My 2 nickels
Believe it or not but I did a roll on with my buddies stock 2015 M3 6spd (I know DCT's are a little quicker) but he could not pass me until after 120mph.
We did four 20-145mph pulls, every single time, the ISF would jump out about 1 car length and hold the lead from 20-120, after 120mph though he started to pull, they have good top end. Afterwards he said he was very surprised he could not pass me until after 120mph.
My ISF at the time had only a Borla exhaust and 377whp. He's also a very good driver and very much into (road course and drag strip) with all his cars, he actually has one of the fastest record 1/4 times in his modded 135i.
Nice M and F!
Originally Posted by flowrider
Really?
Lou
lol at hijacking that pic You have the good side (driver) the other side was actually a lot worse, wish I took comparison photos on that
Even though I have headers, I agree with most of what has been said here. Decatted stock headers yield close to the power of after market headers. It'd be nice to see an E/H/tuned F go at it against an E/decatted/tuned F. I'd be down for that.
I think there was a race like that minus the tunes... It was so close neither could agree on who won.
So to smash the cat, you just use a long flat head and hammer? Do you have to pull any mesh out with a pliers or anything? I'm planning to do this to my car soon.
So to smash the cat, you just use a long flat head and hammer? Do you have to pull any mesh out with a pliers or anything? I'm planning to do this to my car soon.
02-19-16, 11:30 AM
You have the good side (driver) the other side was actually a lot worse, wish I took comparison photos on that 
