HighPressure Adjustable Wastegate V.S. Stock
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Dreamcar86
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The stock waste gate is good to about 18 - 19 lbs of boost and the HD actuator starts at 18 lbs and is adjustable to higher levels of boost.
salvageV6
Daily Driver
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- May 25, 2001
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Different spring pressures in each unit.
Stock adjustable you can go down to about 12 psi. or so.
HD adjustable you can only go down to 17/18 min. boost.
Range is higher over the stocker which is limited usually to around 22/23 psi. max. boost with the arm tight, HD goes up to 26/27 or so.
Roughly speaking about a 5/6 psi. adjustment shift in overall operation.
Stock adjustable you can go down to about 12 psi. or so.
HD adjustable you can only go down to 17/18 min. boost.
Range is higher over the stocker which is limited usually to around 22/23 psi. max. boost with the arm tight, HD goes up to 26/27 or so.
Roughly speaking about a 5/6 psi. adjustment shift in overall operation.
Dreamcar86
Active Member
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Much better explanation than my post.
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- May 26, 2001
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HD actuators mainly come from the turbo manufacturers such as Precision Turbo & Engine, Turbonetics and Limit Engineering. Pretty much all of the supporting vendors on this site can get you one as they sell both Garrett and Turbonetics products. One thing to remember is, these actuators are turbo specific with regards to how they bolt to the back of the compressor cover. Turbos that are equipped with stock style compressor covers, or TA series compressor covers take an actuator that has nothing welded to it but the factory bracket. Other turbos such as the TE, PT, CPT and LT series of turbos require very specific brackets to be welded to the actuator for proper alignment of the actuator arm to the swing valve on the downpipe. It can be a huge headache to try to install a no bracket equipped actuator to a turbo that is larger than a TA series. Check out the Turbo's and turbo related parts forum for more info on the differences between all the different series of turbos.
BTW, welcome aboard and glad to have you with us.
Hope this helps.
Patrick
BTW, welcome aboard and glad to have you with us.
Hope this helps.
Patrick
And one other point to ponder when thinking about a HD actuator that gets left out of virtually all posts dealing with this subjuect; HD actuators are not all created equal. That is to say, you can't just make blanket statements like "HD actutators start at 18psi".
It depends on what base spring you order with your actuator. They can be had with almost any base spring you want.
When I ordered mine, I didn't want one that started so high as 18. So I ordered it with a 14# spring. So, my minimum is 14# and it maxes out at about 21. I can go much higher, but that's because I now run dual solenoids.
It depends on what base spring you order with your actuator. They can be had with almost any base spring you want.
When I ordered mine, I didn't want one that started so high as 18. So I ordered it with a 14# spring. So, my minimum is 14# and it maxes out at about 21. I can go much higher, but that's because I now run dual solenoids.
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- May 26, 2001
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On a bone stock car that has had the Spring Cleaning done and assuming it's on stock injectors with a stock pump, you will be lucky if you can run 14-15psi on 93 octane pump gas without detonation. This is caused by a few things. The stock 86-87 chip had higher timing for the better 93 octane gas we used to have back then. Cure = get a modern chip. The stock wiring to the stock fuel pump, is in-adequate and does not give full voltage to the fuel pump. A hot wire kit cures this issue. Also, the stock fuel pumps' fuel sock has probably collapsed over time and is seriously restricting fuel flow into the pump. Cure = get a new Walbro 255lph pump with install kit. If the car is a high mileage car, you can expect the injectors to be clogged or at a bare minimum have a horrible spray pattern due to deposits.
Now, if you do the basics, new fuel pump, hot wire kit for the fuel pump, adjustable fuel pressure regulator with an accurate fp gauge, and a modern chip such as one of Eric Marshalls Turbo Tweak chips, and have the injectors either cleaned or run alot of injector cleaner through the system, you will be able to turn up the boost to around 16-17psi on todays 93 pump gas. In order to run even more boost on straight 93, you will need to run larger injectors, a larger intercooler and a freer flowing air intake system and exhaust system.
Right now, with my current setup, I am able to run 19-20psi on straight Shell 93 octane with Zero KR and very safe O2 numbers. But my combo is far from being bone stock. The motor is stock, except for valve springs, a RJC power plate for stock plenum and a timing chain.
If the car has a bone stock non adjustable stock wastegate actuator, you can simply run an RJC Boost Control Valve and you will be able to turn up the boost in accordance with whatever octane you run. Assuming you will do the basics to the car, here is an example of typical octane vs boost levels:
93 octane depending on ambient conditions, chip used and altitude
14-18psi.
100-104 octane unleaded, with 100 octane race chip and same conditions, 18-24psi.
110 - 117 octane leaded race gas, with race chip and same conditions, 25-30psi. Tuning for less that 3 degrees to zero Knock Retard. 3 degrees on 30psi would scare me personally. That's 3.0* on a Scanmaster, not .3
HTH
Patrick
Now, if you do the basics, new fuel pump, hot wire kit for the fuel pump, adjustable fuel pressure regulator with an accurate fp gauge, and a modern chip such as one of Eric Marshalls Turbo Tweak chips, and have the injectors either cleaned or run alot of injector cleaner through the system, you will be able to turn up the boost to around 16-17psi on todays 93 pump gas. In order to run even more boost on straight 93, you will need to run larger injectors, a larger intercooler and a freer flowing air intake system and exhaust system.
Right now, with my current setup, I am able to run 19-20psi on straight Shell 93 octane with Zero KR and very safe O2 numbers. But my combo is far from being bone stock. The motor is stock, except for valve springs, a RJC power plate for stock plenum and a timing chain.
If the car has a bone stock non adjustable stock wastegate actuator, you can simply run an RJC Boost Control Valve and you will be able to turn up the boost in accordance with whatever octane you run. Assuming you will do the basics to the car, here is an example of typical octane vs boost levels:
93 octane depending on ambient conditions, chip used and altitude
14-18psi.
100-104 octane unleaded, with 100 octane race chip and same conditions, 18-24psi.
110 - 117 octane leaded race gas, with race chip and same conditions, 25-30psi. Tuning for less that 3 degrees to zero Knock Retard. 3 degrees on 30psi would scare me personally. That's 3.0* on a Scanmaster, not .3
HTH
Patrick
