M35 Boost Bleed Valve

[Sage222]

hmm how hard is the "scottys backyard spring actuator mod" to do?

[Sunkist]

easy if you pay him lol.

he'll send you a modded one and youhave to send him back your stock one.

[slippylotion]

If your talking about putting a spring on the actuator to the the wastegate flap arm, that is one of the first big no no,s to do with a turbo for boost control. There have been many an article written by Martin donen about this back yard fix.

[Sunkist]

i dont know who martin donen is but ok.

im happy with it, its doing exactly what i want

[slippylotion]

He writes all majority of the tech articles in a heap of car magazines. Zoom and high performance import magazine are two that instantly come to mind.

If your modifying the factory actuator like that, I would spend the $140ish and just buy a new adjustable 12 psi actuator and increase the preload from there. Much safer than whacking on a spring.

[Sunkist]

theres about 10 of us doing it now without any problems.

[slippylotion]

Ah well if its working for you thats good, I wouldnt even contemplate doing that to my cars. The best form of boost control is said to be mechanical but only by using the correct pre set adjustable actuator or external waste gate with correct spring. If using an EBC they say to have a mechanical setting of minimum 50% of the max boost set.

[zei20l]

zoom and HPI magazines are notorious for incorrect information............ no offence to that guy. whoever he is lol

[bigkevracer]

Martin works for/runs Willall Racing in SA. Specialise in R35 GTRs these days I think. Knows his stuff. But I don't know what he said...

[scotty nm35]

Ah well if its working for you thats good, I wouldnt even contemplate doing that to my cars. The best form of boost control is said to be mechanical but only by using the correct pre set adjustable actuator or external waste gate with correct spring. If using an EBC they say to have a mechanical setting of minimum 50% of the max boost set.

There are no aftermarket options for us. I only replicate the heavy actuator with the externally adjustable spring to upgrade the stock 7psi one, making sure the spring pulls straight is the key. Its much smarter than winding a heap of preload into those adjustable ones you see around and it fails in the "low boost" setting for most of the scenarios I have thought of, unlike those.

There is no difference in operation between my spring on the side mod and a 17 psi hks actuator so I don't know why everyone is so against it. Come up with a better reason than "its backyard" and I will discuss it as all my mods are backyard. lol.

[Dunc]

Martin works for/runs Willall Racing in SA. Specialise in R35 GTRs these days I think. Knows his stuff. But I don't know what he said...

And arguably one of the best tuners in Australia, looking forward to getting him to have a stab at the M35 over the coming months

[slippylotion]

There are no aftermarket options for us. I only replicate the heavy actuator with the externally adjustable spring to upgrade the stock 7psi one, making sure the spring pulls straight is the key. Its much smarter than winding a heap of preload into those adjustable ones you see around and it fails in the "low boost" setting for most of the scenarios I have thought of, unlike those.

There is no difference in operation between my spring on the side mod and a 17 psi hks actuator so I don't know why everyone is so against it. Come up with a better reason than "its backyard" and I will discuss it as all my mods are backyard. lol.

I'm all for yard yard mechanics, hell, I've been building my own engines and modifying my cars in the back yard for 20 yrs. That's just one mod I wouldn't touch. No offense, just my thoughts.

Edited July 13, 2011 by slippylotion

[Sunkist]

I'm all for yard yard mechanics, hell, I've been building my own engines and modifying my cars in the back yard for 20 yrs. That's just one mod I wouldn't touch. No offense, just my thoughts.

fair enough buddy! appreciate the heads up though, im sure if one of ours fails it'll be mine lol and ill be the first to let everyone know.

[scotty nm35]

Whatever works for you I guess, if you come up with a better option I'm all ears. The 45mm external gate is working fine too but it's still dropping 4psi by 7k. The 1 bar spring isn't enough to hold 20psi let alone the 2 bar it's running ATM.

[Sunkist]

Whatever works for you I guess, if you come up with a better option I'm all ears. The 45mm external gate is working fine too but it's still dropping 4psi by 7k. The 1 bar spring isn't enough to hold 20psi let alone the 2 bar it's running ATM.

lol 2 bar.

[Commsman]

Not sure about these dodgy backyard mods, but I'm all for frontyard mods. (My garage is at the front of my house.)

[bigkevracer]

And arguably one of the best tuners in Australia, looking forward to getting him to have a stab at the M35 over the coming months

Let me know how you go. The tuner I was going to use still wants to persue the Haltech option, which admittedly sounds better (in theory), even though I've bought an eManage

[scotty nm35]

Of course, youre paying for the r+d. Lol

[Jetwreck]

Let me know how you go. The tuner I was going to use still wants to persue the Haltech option, which admittedly sounds better (in theory), even though I've bought an eManage

Don't waste the dollars on a haltech unless its the ps2000

[bigkevracer]

Funny, he says he can do an Emanage tune, but can't quote accurately, so I take it that means he hasn't.

Haltech option is a new unit which works with 350Zs, so they figure it'll work with VQ25s using the same trigger pattern. I have a quote for $500-1000, but no guarantees it'll work.

Seriously considering getting Cian to do it when I come over for Gymkhana World Tour...