The Top DSM Community on the Web

For 1990-1999 Mitsubishi Eclipse, Eagle Talon, Plymouth Laser, and Galant VR-4 Owners. Log in to remove most ads.

Please Support RTM Racing
Please Support ExtremePSI

38mm or 44mm wastegate with gt35r?

This site may earn a commission from merchant
affiliate links, including eBay, Amazon, and others.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

jamesfoster

15+ Year Contributor
61
0
Nov 3, 2007
Moreno Valley, California
I'm getting a gt35r soon and I already have a 38mm tial wastegate. My question is, should I upgrade to a 44mm tial v-band or will it be alright to run the 38mm wastegate on the 35r?
 
Not True.

You only need a big gate if you want to run low boost. I personally have seen a 38mm Gate hold 6psi to Redline on a GT35R sized Turbo.

So you think if I'm going to run 16psi-22psi I'll be alright with my 38mm? I'd rather run my 38mm because I don't really want to spend the money on a 44 but I will if I should.
 
So you think if I'm going to run 16psi-22psi I'll be alright with my 38mm? I'd rather run my 38mm because I don't really want to spend the money on a 44 but I will if I should.

That turbo is still sleeping at that boost. Why run such low boost?

Either was a 38mm will work fine. I've been running one with an FP Green for five years.

Make certain that you get a real one!
TiAL Sport.com
 
That turbo is still sleeping at that boost. Why run such low boost?

Either was a 38mm will work fine. I've been running one with an FP Green for five years.

Make certain that you get a real one!
TiAL Sport.com

I'm most likely only going to run pump gas and for the street and I'll probably run 20-22psi, that's why I was wondering if I should upgrade to the 44mm. However once everything is tuned perfectly for 93 I'll up the boost as high as it'll go without knock.
 
So what's the verdict? keep the 38 or get a 44? also, what bar/spring? I was thinking 1.1bar...
 
I'm most likely only going to run pump gas and for the street and I'll probably run 20-22psi, that's why I was wondering if I should upgrade to the 44mm. However once everything is tuned perfectly for 93 I'll up the boost as high as it'll go without knock.

With a 2.3L and GT35, go with the 44.

As for spring, run a spring for the lowest boost that you plan to run. A 1.1 bar will allow you to run no less than 16 psi and will include a large blue and small yellow spring.

If you don't ever plan to run below 20psi, get one for 20psi (1.4 bar) and you can run twice the spring pressure (40psi) with that spring with a boost controller.

Look at the file below and pick what suites your needs. http://www.tialmedia.com/documents/w3_tial_44_sp.pdf
 
With a 2.3L and GT35, go with the 44.

As for spring, run a spring for the lowest boost that you plan to run. A 1.1 bar will allow you to run no less than 16 psi and will include a large blue and small yellow spring.

If you don't ever plan to run below 20psi, get one for 20psi (1.4 bar) and you can run twice the spring pressure (40psi) with that spring with a boost controller.

Look at the file below and pick what suites your needs. http://www.tialmedia.com/documents/w3_tial_44_sp.pdf


A slight bit old, but in reference to this, what would the better choice be for a GT40 with dual wastegates? Mainly street driven and a few times at the track, but a HP range of about 640-700... any ideas? My engine is also a 2.3L.
 
You can run twin 38s, and 1.4Bar springs, at least that is where I would start.. Keep in mind though, that backpressure will affect this choice too.

If you have excessive drive pressure at your target boost, even with less wastegate valve surface to push on with the 38s vs. 44s it can open them earlier.

Fortunately you likely have two spring choices for your MBC if using one, and several spring options for the gates.
 
You can run twin 38s, and 1.4Bar springs, at least that is where I would start.. Keep in mind though, that backpressure will affect this choice too.

If you have excessive drive pressure at your target boost, even with less wastegate valve surface to push on with the 38s vs. 44s it can open them earlier.

Fortunately you likely have two spring choices for your MBC if using one, and several spring options for the gates.

I was considering running an EBC (MAC 3-port) to control them due to getting an AEM EMS V2. So in theory I shouldn't have a problem if I set the EMS to apply pressure at varying times so that if the back pressure is excessive it will control it accordingly/automatically without me having to manually adjust it?

Would I be wrong in making this move? Or does it sound like a legit plan? Trying to save money but not be in the "regret" situation either...
 
That sort of scheme can help, but in some cases there is no getting around it. I don't think you will have to worry though.

~650awhp on a 40R in T4 footprint shouldn't require excessive drive pressure as long as there are no significant restrictions downstream of the turbine.
 
That sort of scheme can help, but in some cases there is no getting around it. I don't think you will have to worry though.

~650awhp on a 40R in T4 footprint shouldn't require excessive drive pressure as long as there are no significant restrictions downstream of the turbine.

Projected setup will be a JMF T4 top mount, with a 3" exhaust all the way back, don't think I should too much. So two 38mm will do, much appreciated!
 
Get a tial 44mm wastegate or the precision 46mm

More boost = less wastegate is needed. He is trying for near 700 whp on a 40r.

Because he is running a divided housing, he is running a divided manifold. The one he had chosen requires two wastegates. One for each turbine scroll and cylinder pair. This is how my setup is plumbed as well on a 42r sized turbo with the intent to go bigger down the road. I also run two 38mm v-band TiAl gates
 
Landspeed are you saying that using a bigger spring will allow the 38mm to control the boost easier then a smaller spring. I just bought a 38mm an I am catching hell with it
 
Support Vendors who Support the DSM Community
Boosted Fabrication ECM Tuning ExtremePSI Fuel Injector Clinic Innovation Products Jacks Transmissions JNZ Tuning Kiggly Racing Morrison Fabrications MyMitsubishiStore.com RixRacing RockAuto RTM Racing STM Tuned

Latest posts

Build Thread Updates

Vendor Updates

Latest Classifieds

Back
Top