FP 18 psi vs. 25 psi wastegate actuator
#1
FP 18 psi vs. 25 psi wastegate actuator
I have an 18 psi actuator on my Black and I'm wondering whether that might be causing some erratic boost issues I have on spool-up. Does anyone else with a Black have the 18 psi actuator?
For those with a 25 psi actuator, what does your boost curve look like when you run at wastegate pressure. Is there creep above 25 psi up top? How high does your boost spike at wastegate pressure?
Thanks.
For those with a 25 psi actuator, what does your boost curve look like when you run at wastegate pressure. Is there creep above 25 psi up top? How high does your boost spike at wastegate pressure?
Thanks.
#2
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I have an 18 psi actuator on my Black and I'm wondering whether that might be causing some erratic boost issues I have on spool-up. Does anyone else with a Black have the 18 psi actuator?
For those with a 25 psi actuator, what does your boost curve look like when you run at wastegate pressure. Is there creep above 25 psi up top? How high does your boost spike at wastegate pressure?
Thanks.
For those with a 25 psi actuator, what does your boost curve look like when you run at wastegate pressure. Is there creep above 25 psi up top? How high does your boost spike at wastegate pressure?
Thanks.
#5
http://store.forcedperformance.net/m...e=Lancer-Turbo
Thats correct. You have the choice between the 25psi and 18 psi wastegate actuator.
How much PSI are you boosting?
Thats correct. You have the choice between the 25psi and 18 psi wastegate actuator.
How much PSI are you boosting?
#7
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I have an 18 psi actuator on my Black and I'm wondering whether that might be causing some erratic boost issues I have on spool-up. Does anyone else with a Black have the 18 psi actuator?
For those with a 25 psi actuator, what does your boost curve look like when you run at wastegate pressure. Is there creep above 25 psi up top? How high does your boost spike at wastegate pressure?
Thanks.
For those with a 25 psi actuator, what does your boost curve look like when you run at wastegate pressure. Is there creep above 25 psi up top? How high does your boost spike at wastegate pressure?
Thanks.
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#9
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You may have to cut the end of the actuator rod to get enough tension on that puppy. But me I wouldn´t even try to run the 18# actuator on a Black at over 26-27# peak. I would just go straight to the 25# actuator if I was running the Black at 31# peak...don´t pass go! Don´t collect $200.
Last edited by sparky; Oct 28, 2010 at 06:39 PM.
#11
With the 25 psi gate I worry about creep up top from the higher spring rate reducing the travel of the actuator rod. Running a heavily preloaded softer spring should give similar seat pressure with a more widely opened wastegate once it starts opening. I'll try adjusting the preload tomorrow or Saturday. As long as I can bring boost down to 23-24 psi up top (my conservative altmap when things go wrong), I'll be okay with the additional preload (reduced range of travel of the WG puck).
#12
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With the 25 psi gate I worry about creep up top from the higher spring rate reducing the travel of the actuator rod. Running a heavily preloaded softer spring should give similar seat pressure with a more widely opened wastegate once it starts opening. I'll try adjusting the preload tomorrow or Saturday. As long as I can bring boost down to 23-24 psi up top (my conservative altmap when things go wrong), I'll be okay with the additional preload (reduced range of travel of the WG puck).
I would say the 18psi gate fp sells would be a better bet with lots of preload as you just suggested.. i suspect the creep would only go about 22 instead of 30. its still going to creep i think tho.
heres log for reference: (ignore the crappy spool - didnt tune a/f yet there)
#14
tscomp-- That's wastegate pressure with the 25 psi WA? Holy cow. That definitely would not work for me when I get on the road course. 28 psi at 7000 rpm on pump would push the EGTs into the danger zone for road course sessions.
Boosted Tuning -- Are you sure that those cars didn't have the 18 psi gates on them?
FWIW, on my old FP White Rabbit turbo, I ditched the FP 18 psi actuator because it crept to 24-25 in the mid-range on wastegate pressure. I went back to the stock 11 psi actuator. Of course, that was back around 2004 when we all thought 24-25 psi was a race gas boost level.
Boosted Tuning -- Are you sure that those cars didn't have the 18 psi gates on them?
FWIW, on my old FP White Rabbit turbo, I ditched the FP 18 psi actuator because it crept to 24-25 in the mid-range on wastegate pressure. I went back to the stock 11 psi actuator. Of course, that was back around 2004 when we all thought 24-25 psi was a race gas boost level.
#15
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I am running the 18psi waste gate on my fp black and I dont see any boost creep. It holds a constant 27psi all the way to redline. Iam not sure what you guys are talking about when you say to adjust preload. How is that done and why?