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2010 2011 BMW 5 Series Forum F10 F10 Technical Topics Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications RSi Downpipe review for F10 535i (n55)
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      10-07-2011, 05:46 AM   #1
jaekeem
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RSi Downpipe review for F10 535i (n55)

I just wanted to share my personal experience now with this new downpipe from RSi Tuning. At the moment this is the only available downpipe for our N55 motors found on our F10 5-series. I must say this is just a remarkable mod for our cars given the amount of power gained all throughout the powerband.

Current mileage on car: 14,032 miles (JB has been on since 2,000miles)

Current power mods:
RSi downpipe
JB Stage 1 set at +4.5psi over stock
MXP prototype exhaust from e9x M3
K&N drop in panel air filter
91oct pump gas from Chevron

Stock vs. Current power mods


Dyno graph before and after RSi downpipe with the same boost setting


Power
The power gain is remarkable and if you take a close look at the RPM range the power increased its just too much fun to drive. We have the opportunity now to obtain comparable power goals the 135 and 335 owners have.

Torque
Net gain vs Stock: 64tq
Net gain with and without downpipe: 18tq

Horsepower
Net gain vs Stock: 46hp
Net gain with and without downpipe: 19hp

The total power gained from these modifications have increased my driving enjoyment easily ten fold. The peak power that was available with a stock motor is now available from 4300RPM and just continues to climb and hold steady all the way through redline. As for the available torque all I can say is that the car can now spin my BBS LM-R through first gear and a bit of second. I can definitely say that compared to stock this car really can get moving quickly.

Driveability & Sound levels
The driveability of the car remains untouched, I feel that the car is not loud at all with my current exhaust setup. If anything the downpipe is now letting my car breath which allows you to hear the turbo spool, and also gain that throaty/raspy sound. Its definitely got a much more aggressive exhaust note and does not drone at all. When cruising at freeway speeds its actually just a touch louder than stock.

I also had the opportunity to see, hear, and drive Alex's car (78mao) with the same downpipe and with a stock exhaust system, his car is pretty amazing as well. You can definitely hear the turbo spool better and has a similar sound to a 135i and a 335i. So this downpipe definitely does wonders even for those of you that are not interested in getting an exhaust system.

Future power mods:
Custom FMIC
Reinstallation of Meth injection kit
Increase JB Stage 1 boost to +6.0psi w/ Meth injection as advised by Terry
MXP Production exhaust system in full titanium

Final Thoughts
I have been on a quest for power since I first bought this car, and now I can finally say that I am satisfied with the gains this downpipe has provided. If anything this mod finally put good use to the other power mods I have installed and is just...awesome.

My short term goal is to reach 340hp with meth and the production MXP exhaust
Then when I get the chance I am going to try and reach 350hp with an FMIC

Shoutouts go out to the following people:
Daniel @ RSi Tuning
Steve & Tom @ EAS (European Auto Source)
Terry @ Burger Tuning
Alex for introducing me to Daniel
Jsyang15 for making me spend too much money on this car

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      10-07-2011, 09:22 AM   #2
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Jackeem

thank you for the great review. One thing I am curious. All this time, I thought Burger tuning kit is suppose to help gaining UP TO 60 HP. How come after all those mods, you are only able to gain 46 HP?

Please help me understand this.
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      10-07-2011, 11:04 AM   #3
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i like how you thank jimmy!

LOL !
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      10-07-2011, 11:22 AM   #4
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Quote:
Originally Posted by yxc145 View Post
Jackeem

thank you for the great review. One thing I am curious. All this time, I thought Burger tuning kit is suppose to help gaining UP TO 60 HP. How come after all those mods, you are only able to gain 46 HP?

Please help me understand this.
Those numbers were made on an E82 N55 which has a completely different ECU than the F10.
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Last edited by Dr-Euro; 10-07-2011 at 11:28 AM.
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      10-07-2011, 11:56 AM   #5
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Quote:
Originally Posted by Daniel@RSiTuning View Post
Those numbers were made on an E82 N55 which has a completely different ECU than the F10.
oheeeewwww............. that sucks. I have been bragging to people that my car has about 350HP. It is probably not even 320 huh?
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      10-07-2011, 11:57 AM   #6
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Quote:
Originally Posted by 78mao View Post
i like how you thank jimmy!

LOL !
Hey Gi Ba Mao

What do you mean? wasn't trying to be sarcastic.
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      10-07-2011, 12:18 PM   #7
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Wow a lot of chinese people in here..

You think the Burger tuning is worth the upgrade that i could feel good about?
I have an Evo8 in the garage, that i havn't really been driving. its tuned with boost controller 19psi to redline with turbo back exhaust.
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      10-07-2011, 12:34 PM   #8
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Quote:
Originally Posted by yxc145 View Post
Hey Gi Ba Mao

What do you mean? wasn't trying to be sarcastic.
ohh i was referring to jaekeem, hahaha jsyang is who iw as referring to! lol
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      10-07-2011, 01:03 PM   #9
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Quote:
Originally Posted by 78mao View Post
i like how you thank jimmy!

LOL !
Lol jsyang15 is the breaker of bank of accounts!
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      10-07-2011, 02:19 PM   #10
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Jason, You reviews make me want to buy whatever you're talking about.

Looks like I'm sold with this!
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      10-07-2011, 02:24 PM   #11
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Quote:
Originally Posted by LACSTER View Post
Jason, You reviews make me want to buy whatever you're talking about.

Looks like I'm sold with this!
LOL I just enjoy the mods I've been able to get my hands onto. Honestly I think you will like this and the JB stage 1 with your supersprint exhaust. I cannot wait to hear that
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      10-07-2011, 02:26 PM   #12
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Quote:
Originally Posted by yxc145 View Post
Jackeem

thank you for the great review. One thing I am curious. All this time, I thought Burger tuning kit is suppose to help gaining UP TO 60 HP. How come after all those mods, you are only able to gain 46 HP?

Please help me understand this.
Its like Daniel said, the 60hp gain is from the same motor but different chassis car and ecu. Our cars are still being taken apart on the ecu side so we will be making power at a slower rate than the 135 and 335. But you have to remember its only a matter of time before a stage 2 tune becomes available.


Quote:
Originally Posted by trojanlee View Post
Wow a lot of chinese people in here..

You think the Burger tuning is worth the upgrade that i could feel good about?
I have an Evo8 in the garage, that i havn't really been driving. its tuned with boost controller 19psi to redline with turbo back exhaust.

I definitely think the JB is a requirement for this car. This car weighs in at 4100lbs and is a heavy car for its size. Even if the HP numbers arent what you expect, for daily driving the torque is amazing from idle to 5000rpm.

Your evo is a completely different animal and I think its the complete polar opposite of your 535. But I'm sure you would like the added power in the midrange with a downpipe and increased boost
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      10-07-2011, 02:28 PM   #13
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Quote:
Originally Posted by jaekeem View Post
LOL I just enjoy the mods I've been able to get my hands onto. Honestly I think you will like this and the JB stage 1 with your supersprint exhaust. I cannot wait to hear that
Yeah I should have my exhaust next week. I've already advanced my car modding allowance well into next year

Downpipes and JB are a must now. Waiting for Daniel to get back to me about those.
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      10-07-2011, 02:53 PM   #14
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You guys are crazy!!!! are you millionarie or something? or have some type of free sponsorship from all those dealers? All you guys have been changing different body kits, wheels, exhaust systems, suspensions like 10,000 times!!!!
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      10-07-2011, 02:59 PM   #15
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I just got a custom made x-pipe/magnaflow muffler system installed. The sound is good/deep. But It drones like crazy!!! Does anyone of you guys have the same problem with whatever system you have?
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      10-07-2011, 03:42 PM   #16
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Quote:
Originally Posted by yxc145 View Post
oheeeewwww............. that sucks. I have been bragging to people that my car has about 350HP. It is probably not even 320 huh?
Unfortunately no, not even close. As you can see from jaekeem's dyno, we are making 310whp (for now) - this is still a huge improvement from the 264whp baseline. Stay tuned for more aggressive mapping dynos and more.

Quote:
Originally Posted by jaekeem View Post
LOL I just enjoy the mods I've been able to get my hands onto. Honestly I think you will like this and the JB stage 1 with your supersprint exhaust. I cannot wait to hear that
+1!

Quote:
Originally Posted by LACSTER View Post
Yeah I should have my exhaust next week. I've already advanced my car modding allowance well into next year

Downpipes and JB are a must now. Waiting for Daniel to get back to me about those.
PM Sent
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      10-07-2011, 03:55 PM   #17
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why does BMW claim that 535 has 300 HP? can someone explain the logic behind this?
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      10-07-2011, 04:01 PM   #18
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haha, how is my name being thrown out there as a financial crippler when my car is modded like a poor person???

LOL
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      10-07-2011, 04:14 PM   #19
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i swear this forum is gonna make me go broke!! got this on my wish list too now!!
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      10-07-2011, 04:24 PM   #20
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Quote:
Originally Posted by yxc145 View Post
why does BMW claim that 535 has 300 HP? can someone explain the logic behind this?
Car manufactures rate horse power off the crank - this is considered BHP/BTQ or brake horse power/brake torque and is calculated on an engine dyno. As Enthusiast, we are only concerned with the power the reaches the wheels. There is a percentage of power lost in the drivetrain (10-20%) - this is called drivetrain loss. The power that is measured at the wheels is WHP/WTQ or wheel horse power/wheel torque.
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      10-07-2011, 04:31 PM   #21
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so WHP of 310 is equivalent to 370 BHP approx.?
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      10-07-2011, 05:00 PM   #22
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Quote:
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so WHP of 310 is equivalent to 370 BHP approx.?
That is probably pretty close if not accurate
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