Manual boost controllers and external gates

larrym

West Coast Newfy
Joined
Jul 17, 2007
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Mine is plumbed like figure 3 what are the advantages and or disadvantages over figure 2?
 
figure 3 will be the most consistent day-to-day based on my experience with a similar setup years ago
 
The external gate I ran in the past was plumbed like figure 3. It was very consistent and easy to adjust. I never knew you could even hook it up like figure 1&2, I'm curious myself now. Good question!
 
the side port of the wastegate has a pressure leak past the valve guide, this leak changes with temperature.

so anything that is a straight bleeder will be inconsistent from day to day. (the stock solenoid falls into this category)

figure 1 looks to be a ball-and-spring "controller" (its really just an "adjuster"), these work ok in this kind of situation, they tolerate downstream leaks.

figure 2 looks to be a pressure regulator being used in-line, most likely as a bleeder, I would not do things this way, if you have a regulator, set it up like figure 3.

Bob
 
Thanks Bob my controller appears to be the bleeder style would a ball and spring design be a little more consistent?
 
what "controller" do you have? you said you were plumbed like #3 above, which works well in my experience.

B
 
It's a turbonetics set up with an evolution gate the boost fluctuates about a 1lb WOT in 3rd
I sealed a couple leaks I found at the waste gate now I'm just trying to understand the system a little more and see if 1 way is more effective than the other.
 
So from what I have been able to deduce the bleed still is more consistent ball and spring is better for spool as it takes boost pressure to over come the controller spring before the signal is sent to the waste gate
 
you don't have a bleeder, you have a pressure regulator that is sending a controlled amount of balance pressure to the top side of the gate. apples to oranges with a stock gate and bleeder or ball and spring. Was that your trace posted in another thread about the boost? How sure are we that the boost is fluctuating and its not noisy data? The wastegates and stuff like that don't tend to "flutter" the boost changes more slowly due to the wastegate.

Bob
 
Yes that's my thread I have a digital boost gauge with a built in map sensor. The reference line is not tried to the 3 bar map I use to log both show the flutter.
 
I have a new set of plugs set to go in and inspect the old ones when I do just can't find my dielectric grease.
 
i am not a fan of the dielectric grease, I think it just holds dirt. There is probably no downside.

where are your boost/map sensors grounded? where do they tie into the engine for pressure?

Bob
 
The 3 bar map is in the stock map location my boost gauge is on the A pillar and grounded under the dash it's also my meth controller it's a cooling mist unit. The log shows rpm dropping too as it climbs up. You think it could be a voltage issue? It's a 200 amp power master alternator but my voltage drops to 12 volts on the logs typically it's 13.5.
The car runs great the only reason I'm pursuing this at all is that I only get to the track a couple times a year always looking for that extra tenth. I have a date with one of the fastest tracks in northwest on the 17th of June Mission Race way. I had a personal best there of 11.43 with my old motor compared to the 11.85 I ran at our airport a month before. Last year with my new motor 1 ran an 11.32 at the airport so I'm hopping I can break into the 10s at Mission. I started data logging this year in hopes of dialling it in for this trip and I have a tablet set up to log my passes at the track now too.
 
I didn't get the plugs in had pick up the daughter and I hate burning myself:) after I dropped her off I went out and did a little test hit. I have removed the shims from the waste gate so it's just the spring it's not fluttering. I rolled into it in 3rd it went to 24 held steady for a bit then 25 then 26 and I lifted no knock trying to decide what's better the flutter or the creep....
 
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