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    Boost Addict Lifetime Member opiateESP's Avatar
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    Wastegate Adjustment

    I have two simple questions about adjusting our wastegate actuators.

    Does adding preload:

    1.) Increase/reduce boost spikes
    2.) Reduce boost held in higher RPM ranges to trade for earlier spool
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    Senior Member musicsurf's Avatar
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    Adding preload has one major risk and that is boost creep. I am pretty sure that the function of the wastegate is handled more electronically than mechanically, please don't quote me on that though and if I'm wrong someone please chime in and correct me. I live near Forge in Orlando and have their actuator. After talking to them several times and trying different springs/preloads and different preloads on the OEM actuator, their advice has been best. For their actuator 3 full turns~3mm (about half a hole) and that is where it should be set at according to their instruction. I think as long as the spring in the actuator holds the wastegate shut while building/holding boost then you are in the ideal position for preload. From the factory I think there is no preload on the actuator, at least that's how mine was. I haven't noticed any benefit or higher boost by adding more preload and I have gone up to 4.5 turns just to find out. I will say this though, my Forge WG holds higher boost than the stock actuator for reasons I have yet to find out
    Michael
    All Angles Design
    cell - 352.262.6071

    2013 Grigio Abarth
    AAD Torque Strut, AAD Catch Can, ATM FMIC, HCI, and Boost Gauge, Forge BOV and Actuator, Mpx TB, ATP Downpipe, Magnaflow Catback, Ryephile's EVAP Reroute, Neu-f Springs, Koni Yellow Front and Rear Shocks, Neu-F Torsion Bar, TWM Short Shifter, Custom 16x7 Royal Black & Polished Lip Rota RB's

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    Senior Member Rowtarded's Avatar
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    The purpose of adjusting preload on the stock wastegate is to change the stiffness of the factory spring. The more you pre load it the tighter the spring gets. Thus taking more boost pressure to overcome it and open the wastegate.


    Stock actuator has very minor preload. Only about 1mm. As far as adjusting the stock wastegate I have been messing around with it lately. I started out with 3 full turns in from oem position. And 1-3 gear was perfect but I did get some unwanted boost creep in the higher gears. It came back down after a second but I don't like the spike it had so I went back out a full turn (2 full turns from factory) and that seems to be perfect for me. But this all depends on what you have done to the car already. I have a piggy back, intake, downpipe ect. I don't know how this setup would react on a stock car. And the only reason I messed with it at all is because after my downpipe install my peak boost dropped by about 2 psi and I didn't like it. I tried the forge actuator and after installing 2 of them and having weak springs and not being able to spool over 12 psi I gave up and put the oem actuator back on.

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    Boost Addict Lifetime Member opiateESP's Avatar
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    Quote Originally Posted by Rowtarded View Post
    The purpose of adjusting preload on the stock wastegate is to change the stiffness of the factory spring. The more you pre load it the tighter the spring gets. Thus taking more boost pressure to overcome it and open the wastegate.


    Stock actuator has very minor preload. Only about 1mm. As far as adjusting the stock wastegate I have been messing around with it lately. I started out with 3 full turns in from oem position. And 1-3 gear was perfect but I did get some unwanted boost creep in the higher gears. It came back down after a second but I don't like the spike it had so I went back out a full turn (2 full turns from factory) and that seems to be perfect for me. But this all depends on what you have done to the car already. I have a piggy back, intake, downpipe ect. I don't know how this setup would react on a stock car. And the only reason I messed with it at all is because after my downpipe install my peak boost dropped by about 2 psi and I didn't like it. I tried the forge actuator and after installing 2 of them and having weak springs and not being able to spool over 12 psi I gave up and put the oem actuator back on.
    Have you tried other springs in the Forge unit or did you stick with stock? I had a green unit in mine and it wouldn't hold stock 500T boost. I went to a yellow spring and it stabilized things nicely. Better than stock even with out a piggy back. I'm simply trying to establish if there is conventional knowledge relating directly to controlling spiking specifically.
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    Quote Originally Posted by Rowtarded View Post
    The purpose of adjusting preload on the stock wastegate is to change the stiffness of the factory spring. The more you pre load it the tighter the spring gets. Thus taking more boost pressure to overcome it and open the wastegate.


    Stock actuator has very minor preload. Only about 1mm. As far as adjusting the stock wastegate I have been messing around with it lately. I started out with 3 full turns in from oem position. And 1-3 gear was perfect but I did get some unwanted boost creep in the higher gears. It came back down after a second but I don't like the spike it had so I went back out a full turn (2 full turns from factory) and that seems to be perfect for me. But this all depends on what you have done to the car already. I have a piggy back, intake, downpipe ect. I don't know how this setup would react on a stock car. And the only reason I messed with it at all is because after my downpipe install my peak boost dropped by about 2 psi and I didn't like it. I tried the forge actuator and after installing 2 of them and having weak springs and not being able to spool over 12 psi I gave up and put the oem actuator back on.
    Weird I hit 22 PSI spikes and hold 19-20 PSI with the Forge WGA. Granted, I have the 'bigger' of the two models, but from what I've heard even the smaller one is good for wayyyy more boost than we'd ever push. Were you monitoring the stock boost gauge, or Dash Command, or? I'm using the ATM mechanical boost gauge for the numbers I mention above...
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    Senior Member Rowtarded's Avatar
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    Quote Originally Posted by shagghie View Post
    Weird I hit 22 PSI spikes and hold 19-20 PSI with the Forge WGA. Granted, I have the 'bigger' of the two models, but from what I've heard even the smaller one is good for wayyyy more boost than we'd ever push. Were you monitoring the stock boost gauge, or Dash Command, or? I'm using the ATM mechanical boost gauge for the numbers I mention above...
    I had the blue spring. I was told it was at stock or slightly above. Set it to 3mm preload and 12 psi max in sport mode is what I got. Exchanged it for another. Same thing. And the physical strength of the spring is significantly weaker compared to oem wastegate. I am going by stock boost gauge which I know is in accurate. But inaccurate or not I know where it boosts normally and it was way lower with the forge unit.

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    Senior Member Rowtarded's Avatar
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    Also right now with stock wastegate I peak 23 and hold around 19-20 on the oem gauge. And with my piggyback I know those numbers are on the low side of what I am actually running.

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    Senior Member Rowtarded's Avatar
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    Quote Originally Posted by opiateESP View Post
    Have you tried other springs in the Forge unit or did you stick with stock? I had a green unit in mine and it wouldn't hold stock 500T boost. I went to a yellow spring and it stabilized things nicely. Better than stock even with out a piggy back. I'm simply trying to establish if there is conventional knowledge relating directly to controlling spiking specifically.
    To answer your question, boost spikes and or boost creep in controlled by wastegate size. If your wastegate is a decent size then you should be able to prevent boost creep. Boost creep accurs when your wastegate is not big enough to bypass enough exhaust around the turbine to slow the turbo down. Boost spikes are mainly caused by a watergate that does not open quickly enough or is sprung higher than needed. I had a massive boost creep problem on my rx7. So I took the turbo off, ported the wastegate and fabbed up a bigger plunger to cover the larger wastegate opening and it worked so well I could turn my boost controller down to 5psi and it would hold steady with no creep. The Hks evc boost controller I was using was responsive enough to prevent most spikes. Maybe 1-2 psi spikes here and there.

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    Senior Member musicsurf's Avatar
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    The Forge actuator comes from them with a green spring that is way beefier than the yellow or blue spring you can get from them. Just to be sure the two of you with issues did order the actuator for the Punto Evo correct? The one they sell for the 500 is not for our engine, it's for the T-jet. The yellow and blue springs are MUCH weaker than the green spring and testing each of them, I found the blue spring to be comparable to the OEM in both stiffness and function. I am getting my boost readings from an actual boost gauge in the ATM offering.
    Michael
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    cell - 352.262.6071

    2013 Grigio Abarth
    AAD Torque Strut, AAD Catch Can, ATM FMIC, HCI, and Boost Gauge, Forge BOV and Actuator, Mpx TB, ATP Downpipe, Magnaflow Catback, Ryephile's EVAP Reroute, Neu-f Springs, Koni Yellow Front and Rear Shocks, Neu-F Torsion Bar, TWM Short Shifter, Custom 16x7 Royal Black & Polished Lip Rota RB's

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    Senior Member Rowtarded's Avatar
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    The 2 I got where for the punto Evo. And where blue springs. I was told they where supposed to be similar to stock. And neither of them where. After checking installation and preload numerous times on both I just got fed up and returned both of them. And figured out 2 turns in on a stock wastegate have me what I was looking for.

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