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05-17-2017, 10:14 AM
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#1
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Name: jones95runner
Title: Too Much Time
Status: Not Here
Join Date: Jan 2010
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Posts: 1,432
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Tuning a Wastegate
So this is my first go around for running a external gate. This will be with a s488 96 1.32. Motor has made in the 1500hp range with a single and fuel just playing with some new stuff. I have a 50mm high pressure turbo smart Gate coming to go with charger. I think the factory settings on waste gate is 35psi. I have boost and drive gauges.
Im more wondering do I need to go on and plumb air into the waste gate side and add a little more to the spring or leave it like it is and see where im at and go from there.
Also I'm assuming 1:1 would be ideal. So I think thats what I'm shooting for.
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05-20-2017, 02:26 PM
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#2
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Name: Big Blue24
Title: Comp Diesel Sponsor
Status: Not Here
Join Date: Jan 2008
Location: Cedar City, UT
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Posts: 6,310
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Sometimes it works well to simply let drive pressure open the gate and play with wastegate spring tension to adjust overall boost. Sometimes it works best to run somewhat light spring setting say 10 psi, run full boost to the bottom wastegate port to blow it open, and run regulatated boost pressure to the top port to adjust wastegate opening/overall boost.
The second sceanario works well with high pressure ratio setups like compound turbos where you want tune-able controlled opening of the gate and then wide open gate on the topend at high boost.
A third scenario that works as well on trucks with a large single turbo at high pressure ratio meaning drive pressure is likely to be a little higher than boost at max power, is to run a very light wastegate spring, say 5 psi, then put regulated boost to the top port.
Lots of ways to do it, all have slightly different advantages/disadvantages but all work reasonably well.
__________________
95' 2wd Junker Drag Truck
1502 HP Fuel-Only 12mm P7100 Pump
SXE 472 over GTX55 116mm
OEM 12v Block
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05-21-2017, 12:52 PM
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#3
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Name: 97rada
Title: Too Much Time
Status: Not Here
Join Date: Feb 2008
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Posts: 5,410
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Watching this. I am in the process of learning it myself with compounds with the gate dumping in the hot pipe
__________________
Austin
tow truck- 14-3500 with tuning
toy truck -94 rclb auto- 5.2x with a lot left. Shooting for 4s
Any intelligent fool can make things bigger and more complex...it takes a touch of genius- and alot of courage to move in the opposite direction.
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10-31-2017, 05:03 AM
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#4
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Name: trev187
Title: Rookie
Status: Not Here
Join Date: Mar 2014
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Posts: 28
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Interested also, will be playing with one soon
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10-31-2017, 08:05 AM
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#5
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Name: sltlytwkd
Title: addicted
Status: Not Here
Join Date: Apr 2016
Location: Luxemburg WI
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Posts: 138
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Watching this too! Keep it going!
__________________
99' dodge 12v swap, 188/220, 5x16s, scheid 12mm pump, 165lb beehives, silver62/475, fuel lab, 47rh swap
03' jetta tdi, gtb2260vk, race 520s, 3" exhaust, 6" tip, Malone tune, 5 speed
94' dodge ppump 24v, 13mm, 6x18s, 200/220, 475/595, aero 1000, PCS, 4r100 swap, 2wd
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10-31-2017, 11:45 AM
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#6
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Name: Redrider2911
Title: Too Much Time
Status: Not Here
Join Date: Nov 2015
Location: Yakima, WA
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Posts: 780
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I don’t understand. You already have a 1500hp truck and are having trouble tuning a wastegate?...
__________________
49 Willys Pickup. 5600lb. 11.8sec @115mph 1/4. 12 valve. MegaSquirted 47RH. 3.54 posi rear. 35" tires. 64mm HE351ve, S475 (75/96/1.32), A/W Intercooler. AFC mods. 5x16s. 191 DVs, 180 pump. 23*. 85psi. Build Thread
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10-31-2017, 11:49 AM
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#7
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Name: jones95runner
Title: Too Much Time
Status: Not Here
Join Date: Jan 2010
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Posts: 1,432
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Quote:
Originally Posted by Redrider2911
I don’t understand. You already have a 1500hp truck and are having trouble tuning a wastegate?...
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No trouble just never messed with one realy. Never ran one. Not very hard to make 1500hp without one.
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01-03-2018, 03:29 PM
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#8
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Name: 5.9 Cummins Fan
Title: Gearhead
Status: Not Here
Join Date: Mar 2009
Location: Buhl, ID
Member`s Gallery
Posts: 444
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Quote:
Originally Posted by Big Blue24
Sometimes it works best to run somewhat light spring setting say 10 psi, run full boost to the bottom wastegate port to blow it open, and run regulatated boost pressure to the top port to adjust wastegate opening/overall boost.
The second sceanario works well with high pressure ratio setups like compound turbos where you want tune-able controlled opening of the gate and then wide open gate on the topend at high boost.
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This is how I run mine, it works great with twins. Sure it would work well for a large single as well.
__________________
1990 W250 p-pumped, lots of fuel, lots of turbo and nawzzz
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01-03-2018, 03:55 PM
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#9
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Name: Leiffi
Title: Too Much Time
Status: Not Here
Join Date: Jan 2013
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Posts: 1,381
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Quote:
Originally Posted by jones95runner
No trouble just never messed with one realy. Never ran one. Not very hard to make 1500hp without one.
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Might be harder to make with one. Well matched charger dont need one. Everytime you open gate your boost/backpressure ratio will be worse.
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01-03-2018, 05:13 PM
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#10
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Name: jones95runner
Title: Too Much Time
Status: Not Here
Join Date: Jan 2010
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Posts: 1,432
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Quote:
Originally Posted by Leiffi
Might be harder to make with one. Well matched charger dont need one. Everytime you open gate your boost/backpressure ratio will be worse.
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There is a reason said turbo has to be run, and said turbo would most defiantly not live without a gate. It is a animal, makes more power than the hx80 we ran before.. but didn't play with any settings, just bolted on and ran.
We are going to the dyno soon so i will be able to tell if any changes help.
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01-03-2018, 05:24 PM
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#11
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Name: Leiffi
Title: Too Much Time
Status: Not Here
Join Date: Jan 2013
Member`s Gallery
Posts: 1,381
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Quote:
Originally Posted by jones95runner
There is a reason said turbo has to be run, and said turbo would most defiantly not live without a gate. It is a animal, makes more power than the hx80 we ran before.. but didn't play with any settings, just bolted on and ran.
We are going to the dyno soon so i will be able to tell if any changes help.
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1500 is quite much for that small BW turbine so yes wg might help if it is very badly choked.
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