Ext Wastegates

[R34NRG]

since setting up everthing i needed manifold/turbo wise my next step was to choose a good wastegate.

i was wondering out of the pack turbosmart seem to be the cheapest (due to it being a aust product maybe?) but i was wondering out of all of em tial, hks, turbosmart ect ect, are there really any differences? do they make different sounds? (yes i plan to atmo) and how do screamer pipes affect them? sizes available and good performance?

i believe i would be oping for a 44mm but feel free to correct me if im wrong.

the setup will be a 25/30 rebuild with a gt3540

cheers

Edited February 11, 2008 by R34NRG

[bubba]

I was advised to get TiAl and only TiAl.

Got a 44mm TiAl gate to go on my 25/30 with the same turbo

Edit: got my gate off a guy on ebay from the US for a reasonable price.

Edited February 11, 2008 by bubba

[juggernaut1]

Part of your decision will come down to available space to fit the gate. The Tial gates are generally of a more compact design than the turbosmart items. The turbosmart pro-gate is 48mm and is a sizeable gate compared to the Tial 44.

Your getting a 6Boost mani aren't you? I know Kyle recommends the Tials due to their compact design which generally allows the gate to be mounted straight off the manifold for better boost control rather than having a 90 degree bend off the manifold to the gate.

Edited February 11, 2008 by juggernaut1

[R31Nismoid]

A wastegate is a wastegate if you ask me

Different brands are different sizes, thats about all there is to it.

I ran a Turbosmart 45mm gate (obsolete to the 48mm) without issue, and i know plenty of other people that use Tial, Turbosmart, HKS without any issues.

[johnbarry88]

44mm TIAL gate awsome price awsome sound awsome quality what more can you ask for..

[dano4127]

i still cant get my head around what size to buy?

I have a 38mm TIAL I got cheap off the forum to run with my 3540 powered RB30DET but am unsure if it will be a suitable size for my application

[johnbarry88]

38 is to small for a 3540 you should look at 44mm---->50mm

[R31Nismoid]

There is a thread about wastegate sizing - read the FI Guide.

Contains a link to a detailed thread about how to workout what you need

[dano4127]

yeah I have read that a couple of times now, still dont completely understand it but im getting there.

what I would like to know is how having a gate that is too small going to effect performance?

From what i can see it will cause over boosting as there is physically too much exhaust gas to fit through the small gate

[R31Nismoid]

too small wont bleed off enough air, boost spike

but then, it depends on the amount of boost and so on you'll be running

[dano4127]

I dont really care I just need to get the car to the exhaust shop then to the tuner to slap a run in tune in it

once the motor is run in and the wallet has had some time to recover I will buy what ever sized gate i need to run ~20psi at this stage I just need it running

[STATUS]

i still cant get my head around what size to buy?

I have a 38mm TIAL I got cheap off the forum to run with my 3540 powered RB30DET but am unsure if it will be a suitable size for my application

38 way too small, im using a 47mm on our car and it is marginal.

if you on a budget i would only ever consider tial, ive used turbsmart and they fine but are just way too bulky ..

Best bet if you r budget is a bit bigger to use brands like hks, sard (my favorite) greddy etc as they are nice and compact and flow extremely well... i used a Blitz D47D on cats car as i wanted a small gate (close too being to small as possible to aid rapid boost control) and the D47D has twin screamers and flows extremely well.

[Roy]

Its strange how they sound so different. Two cars i have been in that ran a Turbosmart Gate both sounded similar, whilst the Greddy Type R does seem to have a distinctive sound as well. But that could have a lot to do with manifold design as well

[bubba]

My thoughts if you're going to run a 38 on a lowboost run in setup, likely to have overboosting issues..

[paulr33]

there is a formula for working out the wastegate size correctly

[STATUS]

Its strange how they sound so different. Two cars i have been in that ran a Turbosmart Gate both sounded similar, whilst the Greddy Type R does seem to have a distinctive sound as well. But that could have a lot to do with manifold design as well

yeah, even though it isnt a consideration the turbosmart gates seem to sound like ass, i remember swapping out my SARD gate (damaged diaphragm for a turbosmart one way back for some testing on the series 6 and well yeah... regret is one word for it. They do however work well for their cost and we use a few (more 38mm than 44's) as many cannot afford anything else but whenever possible i try to swing em across to TIAL as they are easier to live with size wise.

[tridentt150v]

I used the formula for getting my wg size and it was 40mm, tial had one listed, but I couldn't find a business that would supply one. Couldn't find another company that made one that size. I eventually found a second hand HKS 40mm with a creased diaphragm for $200 and then fixed it up [anodised, high temp coated and new diaphragm etc], seems to work well. I settled on an 18psi spring, but I've got a 14 as well and might try it one day.

You'll have to use the formula and see what size, then decide what boost you want it to work at and the spring rate etc. Its the only way to get it right.

[GeeTR]

Order ur Tial from a US box pusher. Rates are insane atm.

[R31Nismoid]

The turbosmart gate (45mm) that i had, was the best sounding external i've heard to date... and Troy yours would be second on the list without a doubt.

RB20 and your manifold combo has a different sound to it.

More to do with manifold and the way the screamer is (size, angle of cut) than anything else IMO.

[bubba]

I hope my 30 with steampipe high mounted 35R and 44mm gate sounds REALLY nasteh