Drivetrain How much boost are you getting?
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5th Gear
Joined: May 2008
Posts: 942
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From: Nor-Cal
How much boost are you getting?
My Mini is getting 11 PSI of boost max. Curious what others are getting?
Also can anyone point me in the right direction as to what's involved in adjusting the boost on our Mini's? -is it controlled by the ECU? Or adjusted manually? Does it have any negative effects to adjust boost? Curious what the pros/cons are in adjusting the boost.
(oh, i did some searches on this forum but couldn't find anything ...i know this info must exist on NAM'ing)
Also can anyone point me in the right direction as to what's involved in adjusting the boost on our Mini's? -is it controlled by the ECU? Or adjusted manually? Does it have any negative effects to adjust boost? Curious what the pros/cons are in adjusting the boost.
(oh, i did some searches on this forum but couldn't find anything ...i know this info must exist on NAM'ing)
eR1c...
I know you've been around here for a while, and this has been talked about ad nauseum....but I'll be nice and answer for you...
-11 psi is completely normal for a stock car. Depending on whether overboost engages or not, you can see ~13psi give or take.
-Boost is ECU controlled. Don't attempt to adjust the wastegate manually. Some have done it and proved to be a dumb idea and not effective on this modern, computer controlled car. Best way and only way is to alter boost tables/maps through a tune. I'm tuned and see ~17.5 -18.5 psi. In addition, you have the ability of altering more than just boost with a tune, cam timing, ignition timing, fueling...etc. Its a much more complete package.
-Pros...more power, 240 ft-lbs of torque
. cons...shorter turbo life. Just listen to the tiny KO3 on a car running 18 psi of boost....it screams. This will naturally cut its life short....not during the lifetime that most of you will keep your car I'd say...time will tell though. Not really a con for me though, cuz the turbo will be switched to something bigger and better shortly 
I know you've been around here for a while, and this has been talked about ad nauseum....but I'll be nice and answer for you...
-11 psi is completely normal for a stock car. Depending on whether overboost engages or not, you can see ~13psi give or take.
-Boost is ECU controlled. Don't attempt to adjust the wastegate manually. Some have done it and proved to be a dumb idea and not effective on this modern, computer controlled car. Best way and only way is to alter boost tables/maps through a tune. I'm tuned and see ~17.5 -18.5 psi. In addition, you have the ability of altering more than just boost with a tune, cam timing, ignition timing, fueling...etc. Its a much more complete package.
-Pros...more power, 240 ft-lbs of torque
. cons...shorter turbo life. Just listen to the tiny KO3 on a car running 18 psi of boost....it screams. This will naturally cut its life short....not during the lifetime that most of you will keep your car I'd say...time will tell though. Not really a con for me though, cuz the turbo will be switched to something bigger and better shortly
Mine never seems to hit "overboost" even in sport mode. it goes to the same PSI as if Im in normal.
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5th Gear
Joined: May 2008
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From: Nor-Cal
I know you've been around here for a while, and this has been talked about ad nauseum....but I'll be nice and answer for you...
Do JCW's come stock w/ the boost turned up a bit? -and do JCW's have the same turbo as S's? If so, i'd be very willing to tune mine to what the JCW's are getting.
okay, sounds like I am going to have to do a better search of the threads for more answers!
-sorry/thanks! -I knew this must have been on here, maybe I was tired ...yet couldn't find any posts related to boost.
Do JCW's come stock w/ the boost turned up a bit? -and do JCW's have the same turbo as S's? If so, i'd be very willing to tune mine to what the JCW's are getting.
okay, sounds like I am going to have to do a better search of the threads for more answers!
Do JCW's come stock w/ the boost turned up a bit? -and do JCW's have the same turbo as S's? If so, i'd be very willing to tune mine to what the JCW's are getting.
okay, sounds like I am going to have to do a better search of the threads for more answers!
Yes, they can run 19-20psi stock...from what I've heard. Their turbo is based off the same turbo in the S, but the internals of it are slightly bigger.
And to answer you're question...it never stops. Until you get to the point when you sell the car and look at it and wonder why you get no money for it when you've spent thousands on it
It's all worth it though! Life and driving would be boring otherwise
I cant wait (but I have no choice) until the remote tune comes out.
I had a problem where my car wasnt boosting past 6-8 psi no matter what. I was putting my Recaro in and had the battery disconnected. Once I plugged it back in I have been back to the 9-12 psi. Weird.
I had a problem where my car wasnt boosting past 6-8 psi no matter what. I was putting my Recaro in and had the battery disconnected. Once I plugged it back in I have been back to the 9-12 psi. Weird.
A few months ago, I spent hours with Jan road tuning my car, playing with maps in the eprom, trying to overcome that first gear boost limiter. About 20 maps later...many good things came from it, except overcoming the limiter.
It's a hard thing to try and fix on the dyno, because the car is never in 1st gear. It's easily one of the most annoying things ever. Floor it in 1st, the car does nothing...you can even hear it in the exhaust how it spools up real fast, then begins dumping boost @ ~10-11psi. I won't even race anyone off the line because through first gear they get such a jump on me that its hard to catch up...even with all the torque, its embarassing. However...racing people from a roll in 2nd gear and above....its bye bye
. *all on a closed track of course*It takes lots of time playing with different maps on the road to try and fix driveability things like the 1st gear limiter. Jan can't really try too much new stuff when he goes around at tuning parties, because he's essentially there for the day, tuning multiple cars and then gone. If he were to try a bunch of new stuff and then turns out something went wrong, he'd be on the other side of the country with no way to fix it, and the customer would be out a car. Therefore, he just needs lots of time with a local R56 to try map after map after map, to discover new things. I have a hunch that a lot of the maps that you R56 guys have from your tune, stem from my car...and that he just tweaks them to suit your car.
He will soon have my car for as long as he wants though...hopefully LOTS of good things will come from that.
Last edited by ThumperMCS; Jan 18, 2010 at 10:37 PM.
3rd Gear
Joined: Nov 2008
Posts: 190
Likes: 0
From: somewhere in texas
Jan is working on it! Many FWD turbo cars have boost limiters in 1st and sometimes even 2nd gear to alleviate torque steer issues for the common driver. However, I say...just let me modulate it with my own foot thank you very much.
A few months ago, I spent hours with Jan road tuning my car, playing with maps in the eprom, trying to overcome that first gear boost limiter. About 20 maps later...many good things came from it, except overcoming the limiter. It's a hard thing to try and fix on the dyno, because the car is never in 1st gear.
It's easily one of the most annoying things ever. Floor it in 1st, the car does nothing...you can even hear it in the exhaust how it spools up real fast, then begins dumping boost @ ~10-11psi. I won't even race anyone off the line because through first gear they get such a jump on me that its hard to catch up...even with all the torque, its embarassing. However...racing people from a roll in 2nd gear and above....its bye bye. *all on a closed track of course*
It takes lots of time playing with different maps on the road to try and fix driveability things like the 1st gear limiter. Jan can't really try too much new stuff when he goes around at tuning parties, because he's essentially there for the day, tuning multiple cars and then gone. If he were to try a bunch of new stuff and then turns out something went wrong, he'd be on the other side of the country with no way to fix it, and the customer would be out a car. Therefore, he just needs lots of time with a local R56 to try map after map after map, to discover new things. I have a hunch that a lot of the maps that you R56 guys have from your tune, stem from my car...and that he just tweaks them to suit your car.
He will soon have my car for as long as he wants though...hopefully LOTS of good things will come from that.
A few months ago, I spent hours with Jan road tuning my car, playing with maps in the eprom, trying to overcome that first gear boost limiter. About 20 maps later...many good things came from it, except overcoming the limiter.
It's a hard thing to try and fix on the dyno, because the car is never in 1st gear. It's easily one of the most annoying things ever. Floor it in 1st, the car does nothing...you can even hear it in the exhaust how it spools up real fast, then begins dumping boost @ ~10-11psi. I won't even race anyone off the line because through first gear they get such a jump on me that its hard to catch up...even with all the torque, its embarassing. However...racing people from a roll in 2nd gear and above....its bye bye
. *all on a closed track of course*It takes lots of time playing with different maps on the road to try and fix driveability things like the 1st gear limiter. Jan can't really try too much new stuff when he goes around at tuning parties, because he's essentially there for the day, tuning multiple cars and then gone. If he were to try a bunch of new stuff and then turns out something went wrong, he'd be on the other side of the country with no way to fix it, and the customer would be out a car. Therefore, he just needs lots of time with a local R56 to try map after map after map, to discover new things. I have a hunch that a lot of the maps that you R56 guys have from your tune, stem from my car...and that he just tweaks them to suit your car.
He will soon have my car for as long as he wants though...hopefully LOTS of good things will come from that.
thanks for the info!
Thread Starter
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5th Gear
Joined: May 2008
Posts: 942
Likes: 0
From: Nor-Cal
And to answer you're question...it never stops. Until you get to the point when you sell the car and look at it and wonder why you get no money for it when you've spent thousands on it
It's all worth it though! Life and driving would be boring otherwise
It's all worth it though! Life and driving would be boring otherwise
5th Gear
Joined: Mar 2009
Posts: 857
Likes: 0
From: San Marcos, CA
Jan is working on it! Many FWD turbo cars have boost limiters in 1st and sometimes even 2nd gear to alleviate torque steer issues for the common driver. However, I say...just let me modulate it with my own foot thank you very much.
A few months ago, I spent hours with Jan road tuning my car, playing with maps in the eprom, trying to overcome that first gear boost limiter. About 20 maps later...many good things came from it, except overcoming the limiter. It's a hard thing to try and fix on the dyno, because the car is never in 1st gear.
It's easily one of the most annoying things ever. Floor it in 1st, the car does nothing...you can even hear it in the exhaust how it spools up real fast, then begins dumping boost @ ~10-11psi. I won't even race anyone off the line because through first gear they get such a jump on me that its hard to catch up...even with all the torque, its embarassing. However...racing people from a roll in 2nd gear and above....its bye bye. *all on a closed track of course*
It takes lots of time playing with different maps on the road to try and fix driveability things like the 1st gear limiter. Jan can't really try too much new stuff when he goes around at tuning parties, because he's essentially there for the day, tuning multiple cars and then gone. If he were to try a bunch of new stuff and then turns out something went wrong, he'd be on the other side of the country with no way to fix it, and the customer would be out a car. Therefore, he just needs lots of time with a local R56 to try map after map after map, to discover new things. I have a hunch that a lot of the maps that you R56 guys have from your tune, stem from my car...and that he just tweaks them to suit your car.
He will soon have my car for as long as he wants though...hopefully LOTS of good things will come from that.
A few months ago, I spent hours with Jan road tuning my car, playing with maps in the eprom, trying to overcome that first gear boost limiter. About 20 maps later...many good things came from it, except overcoming the limiter.
It's a hard thing to try and fix on the dyno, because the car is never in 1st gear. It's easily one of the most annoying things ever. Floor it in 1st, the car does nothing...you can even hear it in the exhaust how it spools up real fast, then begins dumping boost @ ~10-11psi. I won't even race anyone off the line because through first gear they get such a jump on me that its hard to catch up...even with all the torque, its embarassing. However...racing people from a roll in 2nd gear and above....its bye bye
. *all on a closed track of course*It takes lots of time playing with different maps on the road to try and fix driveability things like the 1st gear limiter. Jan can't really try too much new stuff when he goes around at tuning parties, because he's essentially there for the day, tuning multiple cars and then gone. If he were to try a bunch of new stuff and then turns out something went wrong, he'd be on the other side of the country with no way to fix it, and the customer would be out a car. Therefore, he just needs lots of time with a local R56 to try map after map after map, to discover new things. I have a hunch that a lot of the maps that you R56 guys have from your tune, stem from my car...and that he just tweaks them to suit your car.
He will soon have my car for as long as he wants though...hopefully LOTS of good things will come from that.
You too, eh? LMAO! PM me.
4th Gear
Joined: Apr 2009
Posts: 506
Likes: 30
From: UK
Quite a few folks install their own boost gauges, and some get their boost readings from devices which plug into the OBD port.
The stock standard S boost figure is 0.9bar (13.05psi) with 150 millibars (2.17psi) of over boost pressure.
The stock JCW boost figure is 1.3 bar (18.85psi) with 150 millibars (2.17psi) of over boost pressure.
The stock standard S boost figure is 0.9bar (13.05psi) with 150 millibars (2.17psi) of over boost pressure.
The stock JCW boost figure is 1.3 bar (18.85psi) with 150 millibars (2.17psi) of over boost pressure.
