Boost 've table
Thread Starter
TECH Apprentice
Joined: Jul 2012
Posts: 341
Likes: 12
From: UK
Boost 've table Hi,
Boost 've table not going as high as expected, is this a sign of too restricted exhaust? Was expecting figures of like 140 ish at 8 psi
only boosting to 8psi gt45 turbo ls1.
only getting figures like ve 115 in areas and commanding 11.1 and getting 11.1 ish at 7 to 8 psi.
I do have a referenced regulator if that makes a difference?
can definitely feel seat of pants much faster though....
hadn't dynod it though yet.
regards
gav
Boost 've table not going as high as expected, is this a sign of too restricted exhaust? Was expecting figures of like 140 ish at 8 psi
only boosting to 8psi gt45 turbo ls1.
only getting figures like ve 115 in areas and commanding 11.1 and getting 11.1 ish at 7 to 8 psi.
I do have a referenced regulator if that makes a difference?
can definitely feel seat of pants much faster though....
hadn't dynod it though yet.
regards
gav
TECH Addict
Joined: Dec 2004
Posts: 2,177
Likes: 627
From: Florida
Ve is ultimately an arbitrary number that means nothing except a relative scaler. Make sure the rest of your config and hardware are correct then the ve table is what the ve table is.
just remember in theory there’s no difference between practice and theory, but in practice there is.
just remember in theory there’s no difference between practice and theory, but in practice there is.
TECH Fanatic
Joined: Jul 2022
Posts: 1,032
Likes: 389
From: Alaska
Hey Gav:
You get 'er Un-Corked yet ?
my 5.3, VSR78/75 with stock truck exhaust made plenty boost 12 PSI, and then fell flat over 4000 rpm.
Found the stock exhaust connector flange was only 2.6" Inside Diameter: I hogged it out to 3 inch, and then went 3.5" pipe all the way back, saw 190 kPa thru 6000 rpm, for a short bit.
Reduced wastegate springs to 10# due to local OCTANE restrictions.
anyway, I learned that the 2.75" OD chevy pipes+muffler are getting restrictive about 400 horsepower.
3 inch single pipe might get you near 500 ( flywheel) HP, but is definitely holding you back.
My best guess is that 3.5" single exhaust pipe starts to throttle your efforts around 600 (flywheel) HP.
You get 'er Un-Corked yet ?
my 5.3, VSR78/75 with stock truck exhaust made plenty boost 12 PSI, and then fell flat over 4000 rpm.
Found the stock exhaust connector flange was only 2.6" Inside Diameter: I hogged it out to 3 inch, and then went 3.5" pipe all the way back, saw 190 kPa thru 6000 rpm, for a short bit.
Reduced wastegate springs to 10# due to local OCTANE restrictions.
anyway, I learned that the 2.75" OD chevy pipes+muffler are getting restrictive about 400 horsepower.
3 inch single pipe might get you near 500 ( flywheel) HP, but is definitely holding you back.
My best guess is that 3.5" single exhaust pipe starts to throttle your efforts around 600 (flywheel) HP.
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Thread Starter
TECH Apprentice
Joined: Jul 2012
Posts: 341
Likes: 12
From: UK
Hi,
interesting to know.
no not yet. Have a problem with drivetrain clunking and problems shifting high rpm.
ended up dropping gearbox and found slave piston very tight on retracting the last 2 to 3mm, hoping that was a cause of my clunking.....but don't know why....put a new one in and seems much better but weather not the right time for high rpm shifting...
bought a 3" cut out normally open with vacuum to close from the bay,
looking to see where I can fit that in the downpipe post wideband which guessing will help my very restrictive exhaust, but not easy to fit in.
regards
gav
interesting to know.
no not yet. Have a problem with drivetrain clunking and problems shifting high rpm.
ended up dropping gearbox and found slave piston very tight on retracting the last 2 to 3mm, hoping that was a cause of my clunking.....but don't know why....put a new one in and seems much better but weather not the right time for high rpm shifting...
bought a 3" cut out normally open with vacuum to close from the bay,
looking to see where I can fit that in the downpipe post wideband which guessing will help my very restrictive exhaust, but not easy to fit in.
regards
gav
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