Dinan or RPI?
02-20-2011, 08:04 AM
#31
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My Ride: 545I SMG
While the RPI option is a forum favorite and many compare it other systems including custom quad setups, if you actually look at all the dyno results that have been posted, 99% of them are from RPI themselves. Now I'm not stating that the dyno results are in any way lying, but when I look for a product that will perform, I don't just take the manufacturers word for it. In fact most of this forum believed quad setups would always lose hp based off a manufacturers theory, which was later revealed as false (look up "Truth Behind Quad Setups" thread) as there were proven results of a 10hp gain. So I guess what I'm try to say is that its hard to compare Dinan vs RPI without having unbiased dyno results from either company. What this forum really needs is an exhaust system shootout where we have all the popular exhaust systems dyno'd to show the true numbers of each. Additionally it would be extremely hard to question the variables if all were done on the same machine, the same day and with the same car.
One last note I'd like to add is that while everyone tries to compare what exhaust system is the best performing, most won't even really notice the difference in performance, if indeed there is a gain. Of course when you start to gain 10+ hp, then it will be considerably more noticeable compared to say 3-5hp where the gains are so minimal the "butt dyno" can't notice the difference. The way I see it, our cars are large heavy family sedans and I think its safe to say that 99% of the members here haven't pushed their cars to their true limit, which is where performance is going to play a large factor. With that being said, is 5-10hp really that important or is it the exhaust note you are really going after?
As for installing an RPI exhaust wrong, well thats quite a stretch as its like hooking up a hose. As long as there are no exhaust leaks, there's no other way to install it to make it perform better.
02-20-2011, 09:36 PM
#32
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My Ride: BMW E60 545i 04
Mods: Matte White / Black car color
Matte Kidney Grills
Angel Eyes
White Fog Lights
White lights license plate
M5 Body kit
RPI GT Exhaust
^
Totally agree with you,
i've test my car with another stock 545i .. there's no different at all..! walking side by side
if there's any leaking or issue it would be power loss which make him win
i believe RPI exhausts performance can be noticed only for M5 cars...
Totally agree with you,
i've test my car with another stock 545i .. there's no different at all..! walking side by side
if there's any leaking or issue it would be power loss which make him win
i believe RPI exhausts performance can be noticed only for M5 cars...
02-22-2011, 04:48 PM
#33
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My Ride: 2008 550i (E60) - Titanium Silver | Black Dakota w/ Bamboo Anthracite | Sports Package | Premium Package | Steptronic | Navigation | Logic 7
Former:
1995 540i MSport (E34) - 6sp, B&M Short Shift | Dinan Intake | Dinan Exhaust | Dinan Chip
1987 325iC (E30) - sold
I drive a 2008 BMW 550 - Dinan Stage 1. Over the last three weeks I had the following mods done to my car:
The suspension modifications were secondary. Adding in front and rear braces and changing out the entire suspension system. Coming from the regular Sport Suspension to Dinan Stage 1 suspension, the difference is remarkable. You have the same travel (up and down) as the Sport Suspension, but your 1/2 an inch lower / more aggressive. The car no longer bounces when going over bumps in the road -- it sticks. And lastly, the car has almost zero roll in the corners. The car remains almost flat when going around a corner at 80 mph.
Every time I drive this car I can't help but smile. If you own a 550, these upgrade in my opinion are mandatory.
Todd
- Dinan Free Flow Exhaust
- Dinan High Flow Intake
- Dinan Stage 3 Software
- Dinan Shock Braces
- Dinan Strut Braces
- Dinan Throttle Body
- Dinan Stage 1 Suspension
The suspension modifications were secondary. Adding in front and rear braces and changing out the entire suspension system. Coming from the regular Sport Suspension to Dinan Stage 1 suspension, the difference is remarkable. You have the same travel (up and down) as the Sport Suspension, but your 1/2 an inch lower / more aggressive. The car no longer bounces when going over bumps in the road -- it sticks. And lastly, the car has almost zero roll in the corners. The car remains almost flat when going around a corner at 80 mph.
Every time I drive this car I can't help but smile. If you own a 550, these upgrade in my opinion are mandatory.
Todd
02-22-2011, 07:39 PM
#35
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My Ride: '10 Switzer "Ultimate Street Edition" GT-R
Do you have any other mods? What type of wheels are you running? If your running a 20" wheel and running a stock car with 18" you can throw your hp gain out the window!
02-22-2011, 08:29 PM
#36
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My Ride: E60 M5, F85 X5M
Personally, I plan to do the ESS tune in the coming months after obtaining the correct BDM interface. Unfortunately for me, ESS said they would not send me my original (OEM) DME flash contents prior to putting the tuned image on, so they've pretty much forced me to order a BDM interface so I can suck the original flash contents down myself before shipping my DME out to get it re-programmed. Slightly silly logic on their part given that they know I already have the DME contents from a 650i (same platform, iirc), and I wouldn't be gaining acces to any IP that would be of any threat to them that I don't have already, but I want to run their tune so I'm willing to play along. Just sucks for me cause I want that damn tune and those EVC BDM programmers don't pop up on ebay all that often! 
On the exhaust question, maybe we can just get a few Mexico runs with a car with just the RPI exhaust and one with just the Dinan.
02-23-2011, 10:58 AM
#38
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My Ride: A Car faster than yours.....
Dual exhausts will make power on at least the v8 e60. There is a thread around here with details on the matter. You should probably make some effort to do some reading or buck up and hire a professional to take some measurements for you if you want to pretend to be a subject matter expert in the area.
Maybe I can shed some light here or at least my personal opinion...
While the RPI option is a forum favorite and many compare it other systems including custom quad setups, if you actually look at all the dyno results that have been posted, 99% of them are from RPI themselves. Now I'm not stating that the dyno results are in any way lying, but when I look for a product that will perform, I don't just take the manufacturers word for it.
While the RPI option is a forum favorite and many compare it other systems including custom quad setups, if you actually look at all the dyno results that have been posted, 99% of them are from RPI themselves. Now I'm not stating that the dyno results are in any way lying, but when I look for a product that will perform, I don't just take the manufacturers word for it.
http://www.m5board.com/vbulletin/e63...k-exhaust.html
http://www.m5board.com/vbulletin/off...i-exhaust.html
Feel free to come down anytime and I will be more than happy to show you how we do R&D and why. Then you can give your professional opinion as to how we do our testing.
List your mods please. Saying that the exhaust gives you no power is a false statement especially if you havent had it tested. For all we know you might have an AFE intake or something or maybe 20" wheels.
02-23-2011, 11:07 AM
#39
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My Ride: A Car faster than yours.....
Something to know about changing the throttle bodies. The reason for this mod is to allow more air into the engine. Will this increase power? If your engine holds 4L of air at 100% VE, but is only able to suck in 3.5L of air, will increasing the throttle body diameter cause it to suck in 3.6L of air? Think about it for a second.............
Wihtout increasing intake velocity, your larger throttle body is worthless and in some cases will net you a loss of power.
Wihtout increasing intake velocity, your larger throttle body is worthless and in some cases will net you a loss of power.
02-23-2011, 11:40 AM
#40
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My Ride: 14 550i
lol i was simply stating what they've said before. i don't know if it makes power or not and do not claim that dual exhausts won't make power.
Dual exhausts will make power on at least the v8 e60. There is a thread around here with details on the matter. You should probably make some effort to do some reading or buck up and hire a professional to take some measurements for you if you want to pretend to be a subject matter expert in the area.