Forge actuator

I'm sure the stock one is up to the job on a stock engine and wouldn't notice any difference

 

They dont increase boost

 

They do if you run a shorter rod !

 

they are designed to hold boost pressure better and yea the forge item will give you more boost if you was to make the rod shorter but not always the best way to go if don't know what your doing.

 

I want one just to bling the bay up a little bit. Can these be DIY fitted without a map adjustment? Say I did half a hole preload on a yellow spring ( cars running 21psi ) I'm not paying £400 for another mapping session just to fit one!

 

Actuators dont work the way you are thinking. They have springs in them that are varying strengths dependant on what you put in.

The springs are designed to keep the wastegate penny shut until a certain point is reached , then it opens. Generally the stronger springs crack at a higher boost.

Instance, five gt turbo standard actuator you can pull the rod out with your hand and is around 13psi crack , the dash 31 is around 16 and is a bugger to pull the rod, the larger ones arer near impossible but crack around 20 psi.

The actuators holds your boost , not makes the boost.

 

It wont allow you to run higher boost , it just holds the boost. If the spring is too weak it will just bleed off .

 

I think what they're trying to get at is it'll only give more boost if the original is at a point of leaking from a mapped engine running more boost than it can handle.

 

For me , I wouldnt get one unless its needed.

I run 280+ hp and 300+ ib ft.

I didnt need one.

Does that help ?

 

From what I can gather a uprated actuator can run higher boost, but I've never heard of a 250/265 needing one. Turbos good for 330bhp, so you'd probably be upgrading the turbo before the need for a uprated actuator. So unnecessary unless you plan on big power in the future I think?

 

I just cant see how a forge actuator can get you a free bhp boost.

 

It shouldn't do, just allows the turbo to run at a constant boost pressure if I'm correct? What I was saying is that the standard actuator should be fine, but would give out at a point I.e upgraded turbo running a much higher boost pressure?

 

My understanding is the standard one will be fine too. The stronger spring allows a higher point to be reached and held.

 

I'm running 1.5 bar of boost on the standard actuator and have logged it with the RStuner. My boost level is near identical to my target boost so im assuming it doesn't leak any at this level anyway.

 

Harpo at the end of the day if you want one get one. It will hold the boost better and it'll be a damn sight better quality and look better than the standard oem one. Everyone has their own opinion but at the end of the day it's not going to do any harm only good

 

What if he sets the rod too short , it overboosts and mashes his rods.

It will do harm them

< /pedantic >

 

Your looking for justification , or a reason to buy.

Just buy one , stick it on and sit back knowing you have a forge actuator on buddy. Be happy and enjoy

 

But we're now trying to assess if it can be fitted DIY...?

 

It wont do harm if it's fitted properly.

And I personally don't have one fitted but if you don't know what your doing get someone who does to fit it. Will it sway your decision if no one has one fitted or will you still be undecided? It does the same job as the oem one it's just more robust if you like for holding more boost.

 

If it changes boost , it will change the afr and det ( if there is any ) Just be aware of that.

 

Surely the lambda sensor will adjust the AFR to keep within limits, at worse throwing up stored DTC for long term fuel trim? Same applies to any over boost, I'm 99% sure the car goes into limp mode after sensing a certain over boost threshold.

 

What if it cant adjust to suit ? Mine ( admittedly a r26 ) ran on a remap ( a crap one at that ) a sub 10.5 AFR. The lambda couldnt trim that.

 

I stand corrected, said the man in the orthopedic shoes

 

No. No it wouldnt.

It will allow the full potential vs a tired actuator. It doesnt magically gain power. The only time you will see a back to back power gain is if the old actuator was failing.

The other reason you upgrade an actuator is if a spring cannot maintain the pressure required.

Read this here

 

<sigh>

A standard actuator can hold most boost increases. You are going to have to be going some to find that point where you need the actuator changing.

 

What's the price vs Renault for an actuator? If yours is faulty perhaps this could cost less.