significant increase in boost...why?...how?
12-20-2006, 09:04 AM
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significant increase in boost...why?...how? FI guys...especially ProCharger guys...please comment...
quoted from the following thread:
http://www.performancetrucks.net/for...7&page=3&pp=10
Originally Posted by Superado
went WOT from a roll this morning...45 degrees outside...tranny downshifted...afr went to 11.5...boost jumped in at about 6 #'s...started climbing again...thought last time was a fluke...thought that it would peter out at about 8 #'s...NOPE...climbed to 7...8...9...10...11...12...I got out of it...wtf!?!
I am confused!
I thought by freeing up the exhaust that I would probably lose a pound of boost...which was 8 #'s w/ cats...
spoke w/ ProCharger...they said they didn't have an answer for me...
the first thing they said was that I had a major restriction somewhere...asked me if I changed muffler when I got rid of cats...NOPE...
someone else asked about the blow-off working...but hell, if it wasn't working properly I wouldn't see increased boost @ WOT...and anyways, I can hear it when I let off...
I am confused!
I thought by freeing up the exhaust that I would probably lose a pound of boost...which was 8 #'s w/ cats...
spoke w/ ProCharger...they said they didn't have an answer for me...
the first thing they said was that I had a major restriction somewhere...asked me if I changed muffler when I got rid of cats...NOPE...
someone else asked about the blow-off working...but hell, if it wasn't working properly I wouldn't see increased boost @ WOT...and anyways, I can hear it when I let off...
http://www.performancetrucks.net/for...7&page=3&pp=10
12-20-2006, 11:03 AM
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btw...it is a P1SC...
no belt adjustment...no pulley change (yet) from the 4.0"...
temperature drop yes...both WOT runs were at or below 45 degrees AAT...
nothing else touched other than cat delete... EXCEPT...I did remember yesterday that Jerry filled my AquaMist tank with methanol that was about 1/2 full of distilled water and isopropyl alky...
no belt adjustment...no pulley change (yet) from the 4.0"...
temperature drop yes...both WOT runs were at or below 45 degrees AAT...
nothing else touched other than cat delete... EXCEPT...I did remember yesterday that Jerry filled my AquaMist tank with methanol that was about 1/2 full of distilled water and isopropyl alky...
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12-20-2006, 11:27 AM
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granted...alot cooler weather, but a 4 # increase? 
not to mention that my breather is right above my driver side valve cover...
old pic...no more fmu now...
http://pg.photos.yahoo.com/ph/al_101...e2.jpg&.src=ph
not to mention that my breather is right above my driver side valve cover...
old pic...no more fmu now...
http://pg.photos.yahoo.com/ph/al_101...e2.jpg&.src=ph
12-20-2006, 12:05 PM
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some have mentioned a faulty gauge...it's an Autometer Pro Comp Ultra Lite...
the gauge seems to be working fine under daily driving though...experiencing same vac/boost levels that I always have...I dunno...
the gauge seems to be working fine under daily driving though...experiencing same vac/boost levels that I always have...I dunno...
12-20-2006, 02:28 PM
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Originally Posted by cablebandit
too small i/c with drastic ambient air temp drop is the reason...next
I know we just spoke on the phone in regards to this, BUT, for everyone else's benefit...you may want to elaborate...
12-20-2006, 08:00 PM
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jake...gauge is mechanical...
slowhawk...you mean that the filtered inlet that I currently have could increase boost over the one supplied by ProCharger...right? I agree with that as well as the inlet to TB that I now have would definitely increase boost over the restrictive one supplied by ProCharger...but both of these were in place w/ cats...
The more I think about what Jerry said, the more I think that he has something...if the new filtered inlet and the new inlet to TB both have the potential of increasing boost significantly...maybe it wasn't witnessed in late Summer due to the inefficient IC...45 degree weather and the higher flowing exhaust assisted in overcoming that obstacle...thus...a very significant increase in boost has now been witnessed...
Alot of guys have relocated their filtered inlet...but usually have increased the length of it by several feet...and bends...
several guys have upgraded their IC's...but with no change to the filtered inlet...or inlet to TB either...
slowhawk...you mean that the filtered inlet that I currently have could increase boost over the one supplied by ProCharger...right? I agree with that as well as the inlet to TB that I now have would definitely increase boost over the restrictive one supplied by ProCharger...but both of these were in place w/ cats...
The more I think about what Jerry said, the more I think that he has something...if the new filtered inlet and the new inlet to TB both have the potential of increasing boost significantly...maybe it wasn't witnessed in late Summer due to the inefficient IC...45 degree weather and the higher flowing exhaust assisted in overcoming that obstacle...thus...a very significant increase in boost has now been witnessed...
Alot of guys have relocated their filtered inlet...but usually have increased the length of it by several feet...and bends...
several guys have upgraded their IC's...but with no change to the filtered inlet...or inlet to TB either...
Last edited by Superado; 12-20-2006 at 08:11 PM.
12-21-2006, 04:30 AM
#19
Strange scenario, but I suppose 4 psi is possible with the wrong/right conditions with an inefficient intercooler. The pure methanol will help to keep your engine from self destructing, but as Slowhawk mentioned, the tune needs to be checked. Bob