Best Way To Control Boost?

[geraus]

Hey guys i got a new turbo internal wastegate , now i was just wondering whats the best way to control boost? i want to hit 17-18psi max the turbo is a highflow 3576 with a .63 rear housing. Now i have a high pressure actuator on it and when i flloor it it hits 18psi , and also my Greddy EBC profec spec B-II is connected. Should i remove my ebc? and just let it run with the actuator? what is your advice? not really sure what i should do before i get my tune.. cheers

Geraus.

[R3N3]

if yor profec b isnt up to the job. you should look at the jaycar iebc. i know with a lot of IW turbos, thy hav a drop off in power at higher rpm. the jaycar item allows you to have two boost maps. those maps are fully tuneable allowing you to open/close the WG in small increments when you want. so you can close the WG slightly at the higher rpm to keep that power curve nice and steady. for eg. you can have a wet wether map set at say 10psi, you can tell it to start opening the wg fairly quikly, thus slowly building boost to stop that insane wheel spin in the wet.

you can also have a hi map set to 18psi, keeping the WG shut as long as possible to bring the boost on as quik as possible, then slightly shut the WG at higher rpms to keep that curve steady.

food for thought

[JonnoHR31]

turn the profec off and drive without it doing anything. if it makes boost the way you want it to then yer remove it. if not then use the profec to adjust it, they take a bit of getting used to but they're a good ebc

[geraus]

hmm alright sweet, but i set my greddy profec spec b to 14 psi and it doesnt go to 14psi... it just goes straight to 18psi... does that mean i need to adjust my actuator?

Edited June 9, 2010 by geraus

[wlspn]

Sounds like you have a 1.2 bar actuator?

If so you will never get boost below 18psi (or close enough) no matter what boost controller you use...

Controllers can only raise boost above levels set by the actuator, not lower

[HEKT1K]

yeah probably. take some prelaod off the actuator... you can never boost less than your actuator's minimum, which seems to be about 18psi.

[boostn0199]

I dont think thats true since I have a 14psi actuator with a blitz ebc and my low settings is on 11psi and hi setting on 18

[geraus]

So should I adjust the settings lower???

[wlspn]

Double-post (somehow 1 & a half hours later! Bloody phone...)

Edited June 9, 2010 by wlspn

[geraus]

yeh spoke to hypergear turbos and said the actuator on my car is a high pressure one 1.2 bar.. im gona go and try get lower boost actuator.. i just want hit 16, 17psi max on the motor..

[Randon_I_Am]

I'm in the same boat, got the hypergear ATR43 with high pressure actuator.

I took at least 10mm of preload off it, now it has only about 2-3mm pre-load. It holds true untill boost gets to around 15-16psi then opens.

I also run a greddy profec II but it pretty much isn't doing anything, set on "low" at 0% lol.

Unfortunatly untill i re-do my intake (pod and afm to turbo) i can't hold that boost till redline

[JonnoHR31]

like i said turn the profec off and see what it does. if its too much take some preload off the actuator

how do you know its set to 14psi? the profec works with duty cycles, not set boost levels

[kwickr33]

The boost controller can only rise boost. it can not drop. So if the actuator’s minimum pressure is at 1.2 bar then the minimum boost level can get will be 17psi. Also if your turbo's got gate controller installed then you might want to lose it up or adjust it abit. That sits your final boost level even you have no actuator.

[JonnoHR31]

gate controller? you mean actuator?

no actuator? not possible if you want boost with an IW turbo

[kwickr33]

Its in hypergear's thread. Stao updated it few times, the current one holds boost pretty well. He's using the controlled creep method bringing boost up without drop to 7000RPM. Very smart idea, It worked pretty well. I think its a separate apartment from the actuator, it seems like you can always get to the set boost level even the actuator is removed.

Ie if I set my boost level to 18psi with the gate controller it does not matter what I do to the actuator it will always creeps to 18psi. With actuator I get 18psi by 4000RPM with out I get 18psi by 7000RPM. But you can adjust it to set it at what ever level beyond the tip off level with the actuator.

Edited June 10, 2010 by kwickr33