RG-45 Wastegate Boost Creep
07-01-2013, 12:04 AM
#1
RG-45 Wastegate Boost Creep I have a Turbonetics wastegate on my setup with the 5 pound spring installed. The boost never seems to level off and continues to climb (158kpa in this log). Boost is referenced from the compressor cover and ran to the bottom port on the gate per the instructions. The other port on the bottom is plugged and only one port on the top is plugged. The forth port on the top is left vented to the atmosphere.
Exhaust is an open down pipe that is dumped by the bellhousing. Could exhaust backpressure (not enough?) be causing the issue?
Exhaust is an open down pipe that is dumped by the bellhousing. Could exhaust backpressure (not enough?) be causing the issue?
07-01-2013, 08:57 AM
#2
If everything is plumbed correctly and its creeping up on boost 2 things could be causing it.
1. Gate location is not good enough, causing it to not bleed off enough exhaust thus it keep building boost up
2. Gate is not large enough to dump the exhaust it needs to in order to keep the boost down.
Is this someone turbo kit you're using, or was it built by you/custom?
1. Gate location is not good enough, causing it to not bleed off enough exhaust thus it keep building boost up
2. Gate is not large enough to dump the exhaust it needs to in order to keep the boost down.
Is this someone turbo kit you're using, or was it built by you/custom?
07-01-2013, 11:57 AM
#3
If everything is plumbed correctly and its creeping up on boost 2 things could be causing it.
1. Gate location is not good enough, causing it to not bleed off enough exhaust thus it keep building boost up
2. Gate is not large enough to dump the exhaust it needs to in order to keep the boost down.
Is this someone turbo kit you're using, or was it built by you/custom?
1. Gate location is not good enough, causing it to not bleed off enough exhaust thus it keep building boost up
2. Gate is not large enough to dump the exhaust it needs to in order to keep the boost down.
Is this someone turbo kit you're using, or was it built by you/custom?
07-01-2013, 12:15 PM
#4
9 Second Club
You need more flow out the wastegate as mentioned above.
I notice there is what looks like some sort of adjustment on the top of the w/g. Is this restricting the valve opening ?
I notice there is what looks like some sort of adjustment on the top of the w/g. Is this restricting the valve opening ?
07-01-2013, 12:36 PM
#7
9 Second Club
Whilst it may pre-load the spring more, they usually also restrict the opening of the valve.
A 60mm gate would offer a huge improvement in flow. Although that will of course depend whether the gate is the restriction or the pipework design leading to the gate.
A 60mm gate would offer a huge improvement in flow. Although that will of course depend whether the gate is the restriction or the pipework design leading to the gate.
Trending Topics
07-01-2013, 01:55 PM
#9
That is a crappy location, IMO. Its very similar to the location where ours used to be before we moved it and went to duals...ours was in the same spot, but didnt have the pipe between the gate and the merge like that.
Our car did the same thing like yours is doing, and it also makes it take longer to spool up.
I know fitment is tight in there so im sure theres no much more they couldve done to get the turbo to mount in that area and still have room for the hot and cold side piping, plus down pipe.
I would willing to say a 60mm gate would most likely fix the boost creep, but its hard to really say. I would hate to spend the money for the kit, then buy a bigger gate and it doesnt solve the issue.
How much boost are you trying to run (or not run, lol) ?
Our car did the same thing like yours is doing, and it also makes it take longer to spool up.
I know fitment is tight in there so im sure theres no much more they couldve done to get the turbo to mount in that area and still have room for the hot and cold side piping, plus down pipe.
I would willing to say a 60mm gate would most likely fix the boost creep, but its hard to really say. I would hate to spend the money for the kit, then buy a bigger gate and it doesnt solve the issue.
How much boost are you trying to run (or not run, lol) ?
07-02-2013, 10:29 AM
#11
If you can do it and still have ground clearance, the ideal spot is right where the pipes start to bend up towards to turbo merge on each side..thats where ours is on the 91. I can get you a pic if you want, we're using truck manifolds as well, but no v-bands.
You would need to get some tubing to mount the gate flange to, hold that up there on the hot side pipes, mark it, use a plasma cutter (would be ideal) to cut the holes, weld up the tubing/gate flange. Then you would need to redo your vacuum line setup, but that would be WAY worth it for the control you would have.
I wont mess your thread up, but heres a link to the picture of where our used to be and how it did not work.
http://i32.photobucket.com/albums/d1...1Camaro004.jpg
07-02-2013, 03:52 PM
#12
We haven't had any issues with creep from customers. This location is right in line of exhaust flow from both banks. I ran a 38mm gate in this location on my personal car last year with an 8psi spring and the car never saw above 8psi, controlled it fine! We will see about getting you into a different gate to try Ray! 
Jon
Jon
__________________
Featuring 6 different turbo kits for your F-body!
Check us out on Facebook at: www.facebook.com/HuronSpeed
Featuring 6 different turbo kits for your F-body!
Check us out on Facebook at: www.facebook.com/HuronSpeed
07-02-2013, 08:14 PM
#15
We haven't had any issues with creep from customers. This location is right in line of exhaust flow from both banks. I ran a 38mm gate in this location on my personal car last year with an 8psi spring and the car never saw above 8psi, controlled it fine! We will see about getting you into a different gate to try Ray!
Jon
Jon
