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  #11  
Old 12-01-2012, 07:14 PM
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Quote:
Originally Posted by Penguin View Post
I've found this to provide an effective performance boost:



Sorry, I just couldn't resist...

Oh, now you're talking clip on mods?!?!?
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  #12  
Old 12-01-2012, 10:33 PM
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Quote:
Originally Posted by JCL View Post
I can't imagine a sprint booster being considered a performance mod. It is a gas pedal mod, not a performance mod. If you want to change the pedal action, great.

A blow off valve? Seriously? If I heard one on the street I wouldn't be able to prevent myself laughing. I looked it up to see who was selling BOVs for BMW models and saw an advertisement that stated "has the ever-popular whoosh sound". Honestly. OK. Do what you like, it is your car.
If that makes you laugh, then you should listen to an X5M. It has loud BOVs.

They may sound silly, but they do make a difference. The reason that certain ones make noise is that they hold and release boost better. The BOVs on the 50i don't hold as much boost, so they don't make a funny sound when the boost is released...that fits for a less extreme car. For the more performance-focused M they used different BOVs because of higher boost levels...hence the characteristic "cooing" sound. For someone with a tuned 50i making more boost, upgrading the BOVs would likely make a noticeable difference, as the stock 50i valves aren't meant to handle that level of boost without leaking.
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  #13  
Old 12-01-2012, 11:05 PM
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Quote:
Originally Posted by TahoeM3 View Post
If that makes you laugh, then you should listen to an X5M. It has loud BOVs.
Apparently not loud enough.

http://www.xoutpost.com/bmw-sav-foru...bovs-x5ms.html

The ones that sound laughable IMO are the ones that vent to atmosphere instead of the exhaust.
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  #14  
Old 12-02-2012, 10:48 PM
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Reading this thread is a little confusing to help clear a couple things up. There are two types of blow off valves (BOV) either vent to atmosphere or air recirculated pre-turbo, a by pass valve (BPV) is typically on a roots or eaton style supercharger and is not the same as it allows air to bypass the supercharger when in vacuume.
It's a horrible idea to vent to atmosphere on a MAF system because the ECU has accounted for that air and added additional fuel for it then when you vent the air the AFR goes rich and can cause hesitation. As everyone pointed out it also sounds foolish. Down pipes are a great way to get more of the turbo Spool or "whistle" in my opinion that is the turbo sound that I was to hear. Another this is hard intake pipes with a cone air filter (cold air intake) will also give the OEM re-circ BOV a louder sound as will an aftermarket re-circ valve i havent taken a look to see what kind of valve it is but typically OEMs use a Bosh valve and Samco and Go Fast Bits make direct bolt on replacments for bosh valves they wont hurt your performance and will be slightly louder if that's what you dream about.

Last edited by Sylvan Lake V35; 12-02-2012 at 11:23 PM.
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  #15  
Old 12-03-2012, 12:49 AM
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Originally Posted by ard View Post
Oh, now you're talking clip on mods?!?!?
For some reason, I actually could see/hear ard getting pissed about that. Obviously he wasn't, but still, the thought was funny.
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  #16  
Old 12-06-2012, 05:28 AM
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Diesel mods..

I transformed my diesel X by having the ECU remaped and modified the exhaust to relieve back pressure, also removed the heavy sock off the air filter. End result 203kw (276 HP ) 615nm (452 fp torque ) more than enough for the lighter E53. The company that organised the remap on my car through a German tuner told me for a 40d, a stage 2 tune will achieve 280 kw (380 hp ) 740 nm ( 544 fpt ) with that tune your vehicle would be a rocket ship, then an exhaust mod and your away. My X has been extensivley modified with suspension, wheels, big brake kit, flares, spoilers, etc, all of the changes have been carefully thought out, and all have delivered a good end result. Their too nice a vehicle to mess up. Just my thoughts.
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  #17  
Old 12-06-2012, 07:23 PM
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Quote:
Originally Posted by huntertec View Post
I transformed my diesel X by having the ECU remaped and modified the exhaust to relieve back pressure, also removed the heavy sock off the air filter. End result 203kw (276 HP ) 615nm (452 fp torque ) more than enough for the lighter E53. The company that organised the remap on my car through a German tuner told me for a 40d, a stage 2 tune will achieve 280 kw (380 hp ) 740 nm ( 544 fpt ) with that tune your vehicle would be a rocket ship, then an exhaust mod and your away. My X has been extensivley modified with suspension, wheels, big brake kit, flares, spoilers, etc, all of the changes have been carefully thought out, and all have delivered a good end result. Their too nice a vehicle to mess up. Just my thoughts.
Yea, those are the figures I heard I just need to find a shop in London that can achieve this kind of HP gain with the ECU, and I'm still deciding on the exhaust.
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  #18  
Old 12-06-2012, 11:11 PM
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Remap

Try POWERS 1 on the Forum, I haven't spoken to him for a while, I'm sure he is still around, he knows his craft well. I've been assured these figures are a safe acheivement. The 40d has had extensive engine upgrades over the 3.0d. Good luck with it.
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  #19  
Old 12-08-2012, 02:15 AM
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Originally Posted by X5X View Post
Yea, those are the figures I heard I just need to find a shop in London that can achieve this kind of HP gain with the ECU, and I'm still deciding on the exhaust.
Does Sal with Evolve Automotive work on diesels? They are in your neck of the world, AND Id trust them to do anything....
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  #20  
Old 12-08-2012, 08:54 AM
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Originally Posted by ard View Post
Does Sal with Evolve Automotive work on diesels? They are in your neck of the world, AND Id trust them to do anything....
Yes, they are not far from me, about a 30 min drive. What do they do other than ECUs?
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