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Just Dynoed Rb20det

Waldo

By Waldo,
in Engines & Forced Induction

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Waldo Proficient

Waldo

Posted
Posted

hey guys just got my rb20 tuned and finished today, its didnt pull the power i wanted but i think this is due to lack of boost, i have high flowed turbs and all the supporting mods to run over 320rwhp, but when they went to tune it at 18psi, it would spike there then drop straight back to 12psi, wat is the deal there, there is no leaks in the cooler pipin anywhere as they thoroughly went over them, could this be the actuator on the turbo giving in, or would it be the stock bov opening up? how to i test these 2 things, any recommendations on wat it is would be greatly appreciated. So atm its tuned on 12psi.

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Waldo Proficient

Waldo

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Posted

thats the thing, they installed my apexi boost kit for the power fc, they said it wasnt working very well because it kept losing so much boost and couldnt hold it at 18psi at all, so i gave them my old manual boost controller, and they tuned it for 12psi and said that the manual one worked a bit better and wasnt so spiky, they still couldnt get it to stay at 18psi with the manual boost kit.

BHDave Grand Master

BHDave

Posted
Posted

I found my stock actuator would drop back to 10-11psi at any boost above that.

An aftermarket adjustable would be well worth a look for 2 reasons: 1) you can set a higher base boost on the actuator and so are garanteed of that whatever your ebc does, and 2) The higher the base you set, the easier it will be for the ebc to do it's job and as a result you will have a more stable system with less spiking and a flat line to redline.

predator Grand Master

predator

Posted
Posted

I also have a feeling the stock actuators aren't that good at holding anything above 10psi, unless combined with a decent EBC to pulse it.. Mine can sit on 13-14psi, but always dribbles back to 10-11psi in the higher rev range.

It may be one of those varying things - some factory ones may be fine, others get old and not so good.

I've got an RB20 and RB25 actuator sitting around, should do a couple of swaps and see which is better (onto rb25 turbo).

Cubes Grand Master

Cubes

Posted
Posted (edited)

No.

Boost ramps up harder.

Try not to think about it too much. It works, that is why adjustable rods were created. :blink:

The RB25/VG30 actuator is quite soft and can be adjusted by hand, the RB20 on the other hand requires a big dirty screw driver to be levered against the elbow.

Edited by Cubes

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