Boost drops from 1.1 to 0.6 at WOT in 6th gear
#1
Boost drops from 1.1 to 0.6 at WOT in 6th gear
I' ve got an X50 with Cargraphic/Rs tuning exhaust and flash to 1.1 bar.
Car runs great in all conditions but i've a strange problem: When i push at WOT in 6th gear and when the car hits 6400 rpms and 190 Mph boost drops from 1.1 bar to 0.6/0.7...This is limp mode because when this happen the car only boost 0.6/0.7 in all gears until i stop the engineand turn the key off.
My tuner has replace N75 valve and set wastegate actuators properly but the problem is NOT resolve ?!?
The strange thing is that the car goes in LIMP mode always when it's at WOT at 6400 rpms /190 mph in 6th gear ..
NO CEL and NO codes...?!?
Car runs great in all conditions but i've a strange problem: When i push at WOT in 6th gear and when the car hits 6400 rpms and 190 Mph boost drops from 1.1 bar to 0.6/0.7...This is limp mode because when this happen the car only boost 0.6/0.7 in all gears until i stop the engineand turn the key off.
My tuner has replace N75 valve and set wastegate actuators properly but the problem is NOT resolve ?!?
The strange thing is that the car goes in LIMP mode always when it's at WOT at 6400 rpms /190 mph in 6th gear ..
NO CEL and NO codes...?!?
#3
I' ve got an X50 with Cargraphic/Rs tuning exhaust and flash to 1.1 bar.
Car runs great in all conditions but i've a strange problem: When i push at WOT in 6th gear and when the car hits 6400 rpms and 190 Mph boost drops from 1.1 bar to 0.6/0.7...This is limp mode because when this happen the car only boost 0.6/0.7 in all gears until i stop the engineand turn the key off.
My tuner has replace N75 valve and set wastegate actuators properly but the problem is NOT resolve ?!?
The strange thing is that the car goes in LIMP mode always when it's at WOT at 6400 rpms /190 mph in 6th gear ..
NO CEL and NO codes...?!?
Car runs great in all conditions but i've a strange problem: When i push at WOT in 6th gear and when the car hits 6400 rpms and 190 Mph boost drops from 1.1 bar to 0.6/0.7...This is limp mode because when this happen the car only boost 0.6/0.7 in all gears until i stop the engineand turn the key off.
My tuner has replace N75 valve and set wastegate actuators properly but the problem is NOT resolve ?!?
The strange thing is that the car goes in LIMP mode always when it's at WOT at 6400 rpms /190 mph in 6th gear ..
NO CEL and NO codes...?!?
#4
Joe is probably right... absolute boost map... not to mention Mass air flow maps that actually control the boost as well .. if these values are not not raised enough it will cut the boost... etc...
why dont you lower manually the boost via Wg actuators so you only run .9 bar max.. see if that does the job.. if so then its in the ecu... did you put on after market WG actuators?
why dont you lower manually the boost via Wg actuators so you only run .9 bar max.. see if that does the job.. if so then its in the ecu... did you put on after market WG actuators?
__________________
2001 996TT 3.6L and stock ECU
9.66 seconds @ 147.76 mph 1/4 mile click to view
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2001 996TT 3.6L and stock ECU
9.66 seconds @ 147.76 mph 1/4 mile click to view
160 mph @ 9.77 seconds in 1/4 mile click to view
50% OFF ON PORSCHE ECU TUNING BLACK FRIDAY SPECIAL
#7
Joe is probably right... absolute boost map... not to mention Mass air flow maps that actually control the boost as well .. if these values are not not raised enough it will cut the boost... etc...
why dont you lower manually the boost via Wg actuators so you only run .9 bar max.. see if that does the job
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#8
HI,Just curious,,Could you tell me what you cars MPH is at redline in 5th gear
Usually i shift at 7K so in 5th gearis 168 mph.
#9
Hi,Thanks....My rev limiter is set at 7400 RPM...I have hit that in 5th gear several times and my speedo reads 181mph then....I can not wait to find a open stretch of road and safe to hit the rev limiter in 6th.........i have to do that before you beat me in breaking more then 190mph..lol...
#10
maybe it's a simple as your boost recirculation valve has failed or is failing. per that other thread, and similar symptoms. they go bad, and cause these cars not to fully boost.. no? ( although i have NO business talking parts here...)
Last edited by '02996ttx50; 01-08-2012 at 08:12 AM. Reason: out of my depth
#11
maybe it's a simple as your boost recirculation valve has failed or is failing
#12
Hi,Thanks....My rev limiter is set at 7400 RPM...I have hit that in 5th gear several times and my speedo reads 181mph then....I can not wait to find a open stretch of road and safe to hit the rev limiter in 6th.........i have to do that before you beat me in breaking more then 190mph..lol...
Looking this thread https://www.6speedonline.com/forums/...modded-tt.html
with your 7400 rpms rev limiter if you hit it in 6th gear (with 626 rwhp you do NOT have problem to do this) your REAL speed shoul be 213 mph ( 342 Km/h) but speedo only shows MAX 212 Mph ...
But I shoul never do this in USA road..
NOT after looking this video clip
#13
i believe they ( the valve(s) n75 ) are one and the same and it may be a different terminology from US to UK/europe?. but this thread has experts contributing, so i'll leave that for them to clarify.
#14
BUT - Make sure you have the ignition on when you disconnect it, otherwise the back-up alarm will go off and pierce your eardrums!!
#15
this is STRANGE....Mine retun to run well after i turn off the key.