Explain how a tune works after addition of intake and exhaust?
04-30-2007, 04:48 PM
#1
Banned
Thread Starter
Join Date: Apr 2007
Posts: 419
Likes: 0
Received 0 Likes
on
0 Posts
So I had an exhaust and intake put on my 07 530 and drove it for about a week. Then they removed my ECU (or whatever the computer is called) and "tuned" my software. The shop told me that the tune alone on the engine would boost the hp. But when you ad an exhaust and intake and more O2 comes in. The engine runs lean unless a tune is done to recaliberate for the inceased O2 and you get much more hp out of the mods than had you not tuned.
My question is how this works? Also if they take out the ECU to tune it-how does it "know" what mods I have on the car. Basically what are they tuning it to do after the mods are on?
My question is how this works? Also if they take out the ECU to tune it-how does it "know" what mods I have on the car. Basically what are they tuning it to do after the mods are on?
04-30-2007, 05:06 PM
#2
Contributors
Join Date: Mar 2004
Location: Long Island, NY
Posts: 2,303
Likes: 0
Received 1 Like
on
1 Post
My Ride: 2008 535i: June 6th start build, complete June 17th, at NY Port July 5th, at dealer July 10th, took delivery Friday July 13- Plantimum Bronze/Natural Brown Leather/Light Poplar, Sport Package, Sport Auto, Active Steering, Premium Package, CWP & PDC. Dinan Performance Software 384hp & 421 ft/lbs.
Originally Posted by sleepyca31' post='419581' date='Apr 30 2007, 07:48 PM
So I had an exhaust and intake put on my 07 530 and drove it for about a week. Then they removed my ECU (or whatever the computer is called) and "tuned" my software. The shop told me that the tune alone on the engine would boost the hp. But when you ad an exhaust and intake and more O2 comes in. The engine runs lean unless a tune is done to recaliberate for the inceased O2 and you get much more hp out of the mods than had you not tuned.
My question is how this works? Also if they take out the ECU to tune it-how does it "know" what mods I have on the car. Basically what are they tuning it to do after the mods are on?
My question is how this works? Also if they take out the ECU to tune it-how does it "know" what mods I have on the car. Basically what are they tuning it to do after the mods are on?
04-30-2007, 05:57 PM
#3
Banned
Thread Starter
Join Date: Apr 2007
Posts: 419
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by pennetta' post='419593' date='Apr 30 2007, 06:06 PM
There is a balance between air intake, fuel system and exhaust back-pressure. If you lessen the restriction on air intake, then more air will come in but not more fuel unless you change something there as well. The same is true if you change any of these components without balancing the others. You can put on a low restriction exhaust system that sounds loud and powerful but your engine could be putting out less power if you did not change anything else.
What hp gains does this yeild on a 260hp car to begin with-exhaust/intake and tune?
04-30-2007, 06:58 PM
#5
Members
Join Date: Mar 2007
Posts: 22
Likes: 0
Received 0 Likes
on
0 Posts
there are actually sensors in the engine to detect the amt of o2 in the cylinders. i think the ecu upgrade will alter the limit for the amt of fuel that can be injected into the cylinders. (hope i'm right)
04-30-2007, 07:09 PM
#6
Contributors
Join Date: Mar 2004
Location: Long Island, NY
Posts: 2,303
Likes: 0
Received 1 Like
on
1 Post
My Ride: 2008 535i: June 6th start build, complete June 17th, at NY Port July 5th, at dealer July 10th, took delivery Friday July 13- Plantimum Bronze/Natural Brown Leather/Light Poplar, Sport Package, Sport Auto, Active Steering, Premium Package, CWP & PDC. Dinan Performance Software 384hp & 421 ft/lbs.
Originally Posted by sleepyca31' post='419610' date='Apr 30 2007, 08:57 PM
So how do they "know" how much more air is coming in or how much less back pressure there is etc? I mean the exhaust and intake are on my car and my ECU was taken out-so do they just tune the computer to handle "more" 02 but do not tune it to any specfic amount?
What hp gains does this yeild on a 260hp car to begin with-exhaust/intake and tune?
What hp gains does this yeild on a 260hp car to begin with-exhaust/intake and tune?
04-30-2007, 09:42 PM
#7
Members
Join Date: Feb 2007
Location: Elk Grove, CA
Posts: 211
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by sleepyca31' post='419581' date='Apr 30 2007, 05:48 PM
So I had an exhaust and intake put on my 07 530 and drove it for about a week. Then they removed my ECU (or whatever the computer is called) and "tuned" my software. The shop told me that the tune alone on the engine would boost the hp. But when you ad an exhaust and intake and more O2 comes in. The engine runs lean unless a tune is done to recaliberate for the inceased O2 and you get much more hp out of the mods than had you not tuned.
My question is how this works? Also if they take out the ECU to tune it-how does it "know" what mods I have on the car. Basically what are they tuning it to do after the mods are on?
My question is how this works? Also if they take out the ECU to tune it-how does it "know" what mods I have on the car. Basically what are they tuning it to do after the mods are on?
Post the shop you went to for crissakes, I'll call them, and ask them myself.
04-30-2007, 10:09 PM
#8
Contributors
Join Date: Apr 2005
Location: San Diego, CA
Posts: 7,363
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: 2007 E63 AMG | Obsidian Black | Schwarzes Nappa | Black BirdEye Maple | Premium II Package | Electronic Trunk Closer | Parktronic
Engine: RPi/Powerchips custom ECU tune, RPi Ram Air Kit (BMC filter, scoops), RennTech Sport exhaust, secondary cats, charcoal and resonator delete, custom AAA x-pipe
Exterior: 50% side windows / 35% rear window Formula One Pinnacle Series | Flat AMG hood emblem
Suspension: Renntech Lowering Module
Wheels/Tires: Radenergie R10, Falken FK452 245/30/20, Yokohama ADVAN Sport 285/25/20
-----------------------------------------
2005 545i Sport SMG | Ti Grau | Schwarzes Dakota | Anthracite Maple | Logic 7 | Nav
Engine: Custom AFE CAI, Superchips ECU remap, Sprint Booster, RDSport Dual Exhaust Conversion with Quad Pipes and X-pipe, 3 resonators deleted, 90mm tips!
Exterior: M-Tech Aero kit | M5 Mirrors | M5 Rear Bumper | Trunk Lid Finisher | Vorsteiner decklid spoiler | 50% Formula One Pinnacle Tint
Suspension and Brakes: Bilstein PSS9 coilovers, JBT BBK: 16" cross-drilled rotors, 8 piston and 15" cross-drilled rotors, 4 piston
Wheels: VIP Modular VR 02 20x9F, 20x10R | Toyo T1R 245/30/20F, 285/25/20R
Lights: PIAA 4150K Xtreme White Plus fog lights, AIB v3
MOST IMPORTANT: Hardwired V1; =)
ED Date: 4/7/05, Re-delivery date: 5/21/05
Originally Posted by Jed Peter' post='419669' date='Apr 30 2007, 10:42 PM
I think that instead of doing a search, you should ask this same question 5 more times in 5 different ways.
Post the shop you went to for crissakes, I'll call them, and ask them myself.
Post the shop you went to for crissakes, I'll call them, and ask them myself.
04-30-2007, 10:25 PM
#9
Senior Members
Join Date: Apr 2006
Location: UK
Posts: 3,097
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by vegastrashed' post='419675' date='May 1 2007, 07:09 AM
.some of our e60 brethren across the pond that have remapped their petrol engines swear by these tuners....
Here we have visiting services and the remap is done at your own location. I know that at least one operator sends the original map to a German HQ and gets an email back with the new map which is then applied.
Most offer a free remap in the event of the remap being wiped after a Progman upgrade and only one AFAIK offers a warranty in the event that BMW withdraw warranty support because of the mod (which is claimed to be detectable only by BMW AG Munich).
ABC
Thread
Thread Starter
Forum
Replies
Last Post