Best Gate Size For My Application?

[snozzle]

Hey all,

Will be collecting parts soon for my big single conversion but before i start buying id like to see what people think is the best gate setup to control the boost up to 1.5bar without any spiking or boost curve falling over. Basically want to know from the people who have done it, how you would do it if you did it again.

Since engine is standard Ill be running the turbo at around 1.1-1.2bar for now then it will probably see 1.5bar once the engine is built and a better fuel system is in place.

First q)

Ive seen people run 44mm and also 50mm, not sure which one i need - id have to know which one i want to run before i get a manifold made up correct?

IF i was to go for a twinscroll manifold and had a twinscroll version of the gt35, do i absolutely need 2 gates or can i run 1 big gate with 2 sources off the merge collector without any problems? has anyone done this with the gt35 twin scrolled?

I want to be able to run the exact same turbo kit once the motor is built to handle 500-550hp.

Ill be getting a 6boost manifold made up but im just not sure on what size gate to run and wether or not i should bother having the gate source off the turbo ex housing or off the merge collector, ive seen both.. whats the difference??

Please post what gate setups (brand size pressure source etc) you have used and if you have had any issues with them + i guess the ebc used would be important too! ill be running a profec b spec 2 unless someone on here tells me it wont be up the task

cheers!

oz

Edited October 13, 2010 by snozzle

[KiwiRS4T]

Its off the turbo housing on my GT35 on a Sinco customs manifold (similar to 6boost) because that provides the most direct route for the exhaust gasses. I have a 50mm Synapse w/g - I don't think it can be too big but it can be too small so I should be ok (engine still out so it hasn't been run yet.

[kwickr33]

Theoretically bigger gate will divert more heat, Get the HKS 50mms with the twin spring setup. That will hold boost nice and flate.

[SimonR32]

Tial 44mm will be fine...

Would go a 3076R over a 3582R any day of the week though

[STATUS]

if you can go the bigger gate, we've had issues with boost creep and the 6 boost manifolds. If possible get an ungated 6boost version and run the gate off the housing.

[R31Nismoid]

Ill be getting a 6boost manifold made up but im just not sure on what size gate to run and wether or not i should bother having the gate source off the turbo ex housing or off the merge collector, ive seen both.. whats the difference??

Talk to Kyle and ask him.

People have had boost creep issue's on those manifolds with less than 50mm gates (from reading a few threads over the years). Not sure of the exact reason behind it.

I believe a 50mm is recommended at a min to stop this. It does go against the theory, which would suggests a 45mm gate would be perfectly fine.

For my GT30 (600hp) I used a Turbosmart 45mm gate and it was perfectly fine @ 24psi.

And for some theory reading, have a look here:

http://www.skylinesaustralia.com/forums/ex...zes-t43638.html

[STATUS]

Talk to Kyle and ask him.

People have had boost creep issue's on those manifolds with less than 50mm gates (from reading a few threads over the years). Not sure of the exact reason behind it.

I believe a 50mm is recommended at a min to stop this. It does go against the theory, which would suggests a 45mm gate would be perfectly fine.

For my GT30 (600hp) I used a Turbosmart 45mm gate and it was perfectly fine @ 24psi.

And for some theory reading, have a look here:

http://www.skylinesaustralia.com/forums/ex...zes-t43638.html

is your gate one of the new generation 45mm? they seem to punch above their weight flow wise... its the smaller tial ones we had issues with, swapped it to a 50mm and issue solved.

[R31Nismoid]

Nah this was going back 5 years. Was a old progate from memory. I think i have a picture of it somewhere, will check later.

Turbosmart stopped making 45mm gates and went to 48mm/teflon coated for a while and now have 45mm's back again, although this was a few year ago.

[Weapon]

if you can go the bigger gate, we've had issues with boost creep and the 6 boost manifolds. If possible get an ungated 6boost version and run the gate off the housing.

I would love to get your insight into what is wrong with my set up then. I got my kit off ETM which is similar to 6Boost again with an un gated manifold and it runs off the housing with a Tial 44mm gate and it won't even come close to controlling boost. My kit is coming off to go back to him to get modded to run like a conventional set up.

The only thing i can see different to the number of these on this site and mine is where mine is plumbed into the housing.

We tapped a new vac feed with bigger vac line, disassembled the wastegate to check if anything was wrong. It was perfectly fine. Changed to a brand new Turbosmart 45mm gate and same issue. Past 5000rpm it spikes past both the 14psi spring pressure and 10psi spring pressure to 21psi we even went as far as to dropping off the screamer pipe to eliminate that as a cause and still spiking.

This was all with no EBC and should just be running spring pressure. So i will be going to wastegate off the manifold set up.

Mine is a GT3582R with 0.82 ex housing also

[ahh 33 s2]

snozzle, cant talk from experiance, but i have a 6boost a GT35 with .82 rear and a turbosmart 48mm progate with a 21psi spring combo,

going on a built 26.

the gate is off the manifold, right at the merge collector

[snozzle]

Thanks for the replies guys but i still have question marks in my head.

I will give kyle a call very soon and see what my options are.

Daniel when will that setup be in action? Would love to see how it goes and how much power it ends up making

[Weapon]

snozzle, cant talk from experiance, but i have a 6boost a GT35 with .82 rear and a turbosmart 48mm progate with a 21psi spring combo,

going on a built 26.

the gate is off the manifold, right at the merge collector

Thats where mine will be getting located i'd say

[snozzle]

I was talking to simon-r32 regarding the position of the wastegate being on the merge collector and he tells me its not very efficient as the gases flyright past it. Makes sense if the manifold is flowing really well.

Have you tried a 50mm gate? got pics of your yoursetup and how its been welded? maybe is not in the most optimal position ?

[Weapon]

I was talking to simon-r32 regarding the position of the wastegate being on the merge collector and he tells me its not very efficient as the gases flyright past it. Makes sense if the manifold is flowing really well.

Have you tried a 50mm gate? got pics of your yoursetup and how its been welded? maybe is not in the most optimal position ?

Had a quick chat with Paul from Red R Racing and thats what he said in regards to my set up

Here is a pic for reference

[JonnoHR31]

I was talking to simon-r32 regarding the position of the wastegate being on the merge collector and he tells me its not very efficient as the gases flyright past it. Makes sense if the manifold is flowing really well.

thats exactly why kyle recommends bigger gates with his manifolds, because the efficiency of the manifold means theres not much exhaust flow down the gate pipe.

i think when i was enquiring about one he recommended a 60mm gate for that reason

Edited October 14, 2010 by JonnoHR31

[Weapon]

For reference here is a HKS display engine with a good look as to how the wastegate is plumbed in. Obviously this would use at minimum the 50mm wastegate they produce.

Although on the subject of wastegate size. Standard XR6 turbo with upgraded 0.7 A/R comp cover and running the same 44mm tial gate with the same exhaust mod as mine and it runs perfect...

Edited October 14, 2010 by Weapon

[3BEPKA]

I have been running this combo for 2 years now daily with no dramas. It's built 25 with GT3582R and TIAL44mm gate on 6boost manifold and Haltech E11 ECU,running 19psi and 24 psi.

Hope it helps.

[R31Nismoid]

is your gate one of the new generation 45mm? they seem to punch above their weight flow wise... its the smaller tial ones we had issues with, swapped it to a 50mm and issue solved.

Knew i had one somewhere

[KiwiRS4T]

Ok looks like I was wrong to say your gate can't be too big but the literature that comes with the GT35 emphasises having the most direct route for the waste gate and that would seem to support having it come off the housing as recommended by Trent and also my manifold maker.

[r33cruiser]

If you called up kyle, he would have recommended a 50mm turbosmart gate

I am using this setup, so are a few other cars built by my mechanic with absolutely no drama's.

Also have had NO problems with the gate comming off the collector of the manifold, he fabs them that way for a reason right...

Edited October 15, 2010 by r33cruiser