How much boost in stock X50?
#4
12-20-2005 | 10:31 AM
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Re: How much boost in stock X50?
Originally posted by ari
X50 / TruboS owners. How much boost do you see if punching it form 2000 to 3000 RPM in 3rd or 4th gear (at 3000 RPM)?
X50 / TruboS owners. How much boost do you see if punching it form 2000 to 3000 RPM in 3rd or 4th gear (at 3000 RPM)?
What RPM is peak boost? 3000+? I can't imagine you getting much more than 0.6-0.7 if only running it from 2000-3000 in 3rd/4th. The turbos don't have enough time to spool if peak boost is reached at a higher rpm.
#5
12-20-2005 | 10:46 AM
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I tested this out this weekend. I was pulling a steady .8 in 5th gear in the 120+ mph range. brief spike of .9 ran out of room to see what happened in 6th gear. Have '03 X50 with 20K miles.
tmw
tmw
#7
12-20-2005 | 11:14 AM
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To be more specific, what's the max boost you get at 3,000 rpm. I guess this more a question about throttle response and lag, as opposed to max boost.
Last edited by Turbo Fanatic; 12-20-2005 at 02:48 PM.
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#8
12-20-2005 | 03:37 PM
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Originally posted by ari
To be more specific, what's the max boost you get at 3,000 rpm. I guess this more a question about throttle response and lag, as opposed to max boost.
To be more specific, what's the max boost you get at 3,000 rpm. I guess this more a question about throttle response and lag, as opposed to max boost.
Have everyone start @ 2500rpm in 6th gear and then climb to 3000rpm to see what their boost is at.
Last edited by Ruiner; 12-21-2005 at 08:52 AM.
#10
12-21-2005 | 02:41 AM
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Originally posted by Ruiner
Run a higher gear so that the rpms are climbing too quickly for you to see.
Have everyone start @ 2500rpm in 6th gear and then climb to 3000rpm to see what their boost is at.
Run a higher gear so that the rpms are climbing too quickly for you to see.
Have everyone start @ 2500rpm in 6th gear and then climb to 3000rpm to see what their boost is at.
#13
12-21-2005 | 11:56 AM
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the dealer has wiped out my ecu so i've got stock programming right now and some mods (k16/24 hybrids, exhaust, headers, & wastegate adjustments)
in 2nd gear, i can only hit .7 bar most of the time.
in 3rd gear, i can only hit .7/.8 bar until 6000rpm or so, and then it jumps to 1.0 bar (suddenly, car feels like a rocket.)
this seems like very strange behavior to me; i would expect full boost to come on earlier. is the ECU limiting boost in the lower rpm?
(just trying to understand ECU/boost characteristics before i get re-programmed.)
- chuck
in 2nd gear, i can only hit .7 bar most of the time.
in 3rd gear, i can only hit .7/.8 bar until 6000rpm or so, and then it jumps to 1.0 bar (suddenly, car feels like a rocket.)
this seems like very strange behavior to me; i would expect full boost to come on earlier. is the ECU limiting boost in the lower rpm?
(just trying to understand ECU/boost characteristics before i get re-programmed.)
- chuck
#14
12-21-2005 | 02:23 PM
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Originally posted by carendt242
the dealer has wiped out my ecu so i've got stock programming right now and some mods (k16/24 hybrids, exhaust, headers, & wastegate adjustments)
in 2nd gear, i can only hit .7 bar most of the time.
in 3rd gear, i can only hit .7/.8 bar until 6000rpm or so, and then it jumps to 1.0 bar (suddenly, car feels like a rocket.)
this seems like very strange behavior to me; i would expect full boost to come on earlier. is the ECU limiting boost in the lower rpm?
(just trying to understand ECU/boost characteristics before i get re-programmed.)
- chuck
the dealer has wiped out my ecu so i've got stock programming right now and some mods (k16/24 hybrids, exhaust, headers, & wastegate adjustments)
in 2nd gear, i can only hit .7 bar most of the time.
in 3rd gear, i can only hit .7/.8 bar until 6000rpm or so, and then it jumps to 1.0 bar (suddenly, car feels like a rocket.)
this seems like very strange behavior to me; i would expect full boost to come on earlier. is the ECU limiting boost in the lower rpm?
(just trying to understand ECU/boost characteristics before i get re-programmed.)
- chuck
The problem is that the ECU on the stock TT (with K16s, no clue how the X50 curve looks, but I would assume that it is similar) peaks to ~0.8bar, drops to 0.6 bar, then peaks again at 6000rpm to ~0.7 bar. Getting 1.0 must be a product of the hybrid turbos. As you can see, the boost is ECU controlled.
The stock boost curve (1) is below (remember that it is taken at 1 atm I do believe, so you have to subtract that out in order to get the absolute pressure):
Last edited by Ruiner; 12-21-2005 at 02:26 PM.
#15
12-21-2005 | 06:42 PM
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well, i get the same behavior if i punch it from 2500rpm in 4th gear.
i should get (close to) maximum load at this rpm point in such a high gear, but it will stick to .7/.8 bar til the higher rpms where it will suddently let go to 1.0 bar.
again, i might have too many variables/mods to really figure out what's going on, but it just seems like odd behavior.
regardless, the re-flashed ecu will be in soon.
- chuck
i should get (close to) maximum load at this rpm point in such a high gear, but it will stick to .7/.8 bar til the higher rpms where it will suddently let go to 1.0 bar.
again, i might have too many variables/mods to really figure out what's going on, but it just seems like odd behavior.
regardless, the re-flashed ecu will be in soon.
- chuck