FAST-XR EVIL T Member 259 Member For: 16y 6m 7d Gender: Male Location: Liverpool NSW Posted 17/03/11 09:49 PM Share Posted 17/03/11 09:49 PM (edited) I measured my hot side pressure on both tunes (from the actuator line at the turbo)10 psi tuneTurbo Pressure: 11 psi steadyManifold Pressure: 9psi and tapered to 7.5 psi12 psi tuneTurbo Pressure: 14 psi steadyManifold Pressure: 12psi and tapered to 9.5 psiSo iniatially I have a pressure drop of 2psi then somehow my manifold pressure drops another 2.5 psi while the turbocharger is still pumping out the same pressure...Does this sound like a boost leak?????a constant pressure should equal constant pressure drop right?also is a 2psi drop overall acceptable? (that's inclusing hot side pipes, cooler, and cold side pipes) Edited 17/03/11 09:56 PM by FAST-XR Link to comment https://www.fordxr6turbo.com/forum/topic/73860-turbo-to-manifold-pressure-drop/ Share on other sites More sharing options...
PHANTMXR6 It's not a MKI! Member 1,742 Member For: 16y 11m 27d Gender: Male Location: Earth Posted 17/03/11 09:58 PM Share Posted 17/03/11 09:58 PM Depends how far into the rev range it starts to taper off.It may be part of the tune.Constant pressure at constant revs is correct, but when you cahnge things like engine revs and turbo revs pressures will change. Link to comment https://www.fordxr6turbo.com/forum/topic/73860-turbo-to-manifold-pressure-drop/#findComment-1089763 Share on other sites More sharing options...
FAST-XR EVIL T Member 259 Member For: 16y 6m 7d Gender: Male Location: Liverpool NSW Posted 17/03/11 10:07 PM Author Share Posted 17/03/11 10:07 PM it tapers off at about 4000 rpm, shortly after hit hits max boost... Link to comment https://www.fordxr6turbo.com/forum/topic/73860-turbo-to-manifold-pressure-drop/#findComment-1089765 Share on other sites More sharing options...
Wenier Donating Members 1,736 Member For: 15y 4m 29d Gender: Male Location: Christchurch, New Zealand Posted 18/03/11 06:10 AM Share Posted 18/03/11 06:10 AM Also pressure is relative to temp and other such things. Link to comment https://www.fordxr6turbo.com/forum/topic/73860-turbo-to-manifold-pressure-drop/#findComment-1089895 Share on other sites More sharing options...
spoolxr6 Member 312 Member For: 14y 7m 1d Posted 18/03/11 06:37 AM Share Posted 18/03/11 06:37 AM What intercooler r you running. A 2psi pressure drop across a crap intercooler is not abnormal. Link to comment https://www.fordxr6turbo.com/forum/topic/73860-turbo-to-manifold-pressure-drop/#findComment-1089912 Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,332 Member For: 19y 8m 24d Gender: Male Location: Perth Posted 18/03/11 06:41 AM Share Posted 18/03/11 06:41 AM So is boost drop off up high with a stock actuator with higher than factory boost. Link to comment https://www.fordxr6turbo.com/forum/topic/73860-turbo-to-manifold-pressure-drop/#findComment-1089914 Share on other sites More sharing options...
FAST-XR EVIL T Member 259 Member For: 16y 6m 7d Gender: Male Location: Liverpool NSW Posted 20/03/11 09:49 PM Author Share Posted 20/03/11 09:49 PM On 18/03/2011 at 6:37 AM, spoolxr6 said: What intercooler r you running. A 2psi pressure drop across a crap intercooler is not abnormal.a HDI cooler, 580 x 220 x 100...boost definately seems to start to fade when the motor is hot...I pressure tested my intercooler piping on the weekend, and found no leaks!so if my turbo is pushing constant pressure, and I have no leaks in my pipework, im thinking that I might have a leak in the intake manifold somewhere that gets worse after it gets hot... Link to comment https://www.fordxr6turbo.com/forum/topic/73860-turbo-to-manifold-pressure-drop/#findComment-1090557 Share on other sites More sharing options...
spoolxr6 Member 312 Member For: 14y 7m 1d Posted 20/03/11 10:24 PM Share Posted 20/03/11 10:24 PM It's acrross your core. With the HDI intercooler I had a 3-4 psi pressure drop @ about 19psi. We found this after changing over to a Plazmaman core and boost was up. Link to comment https://www.fordxr6turbo.com/forum/topic/73860-turbo-to-manifold-pressure-drop/#findComment-1090559 Share on other sites More sharing options...
FAST-XR EVIL T Member 259 Member For: 16y 6m 7d Gender: Male Location: Liverpool NSW Posted 20/03/11 10:29 PM Author Share Posted 20/03/11 10:29 PM On 20/03/2011 at 10:24 PM, spoolxr6 said: It's acrross your core. With the HDI intercooler I had a 3-4 psi pressure drop @ about 19psi. We found this after changing over to a Plazmaman core and boost was up.witht the HDI did your boost curve hold steady? or did it drop off at high revs? Link to comment https://www.fordxr6turbo.com/forum/topic/73860-turbo-to-manifold-pressure-drop/#findComment-1090560 Share on other sites More sharing options...
Epic XR6 Member 22 Member For: 14y 2m 19d Gender: Male Location: Central Qld Coast Posted 03/04/11 10:17 AM Share Posted 03/04/11 10:17 AM Also another thing to look out for is the blow off valve leaking under boost.My R32gts-t used to do it bad just swapped it out and it was all good. Link to comment https://www.fordxr6turbo.com/forum/topic/73860-turbo-to-manifold-pressure-drop/#findComment-1094176 Share on other sites More sharing options...
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