Tial 35mm vs. 38mm wastegate differences, dimensions, pics, diaphragm

[XDEep]

i think someone swapped the cap on my 38mm to the 35mm so i thought i was jipped, but it turns out at least i do have the 38mm valve.

here are my measurements +/-.02mm:

outlet: 35.22mm.
inlet: 44.04mm.
fire ring seat: 40.24mm.
fire ring o.d.: 44.10mm (measured in hand, fits snug in inlet).
fire ring i.d.: 34.85mm.
valve: 38mm (rough estimate).

outlet bolt holes shortest distance: 64.44mm.
outlet bolt hole: 6.65mm threaded.
inlet bolt holes shortest distance: 62.42mm.
inlet bolt hole: 8.65mm unthreaded.

some quotes from honda-tech.com

@Pat

I got both a 35mm and a 38mm and what’s interesting is that the valve seat ring for the 38mm has an ID of 35mm while the 35mm has an ID of 32mm, so technically the 38mm wg will fit better on a 35mm manifold flange

@ben@importparts.com

The 35mm and 38mm use the exact same flange.

@quikB18B

They use the same flange, the outside is the same side, its the inside diamteter thats 3mm larger. No major difference besides that that im aware of. Also the 35mm is discontinued, the 38mm replaced it.

@johnisenglish

The 35mm Deltagate, 35mm Tial and 38mm Tial wastegates all use the same flange.

@ben@importparts.com

The 38mm wastegate in silver will be the same size. They use the 40mm top for other colors and it is taller.

@InfamousRS

The “38mm” or “35mm” refers to the actual size of the valve.

@Hoosier Daddy

Saw this question pop up quite a few times in the past, and I saw a few different numbers floating around, so I decided to contact Tial and get the right numbers.

Wastegate - 35mm

BAR // PSI // Color // OD

0.30bar // 4.35psi // Sm. Yellow // 1.875in
0.45bar // 6.53psi // Sm. Red
0.65bar // 9.43psi // Sm. Green
0.8bar // 11.60psi // Sm. Blue

Wastegate - 35mmHP

BAR // PSI // Color // OD

0.95bar // 13.78psi // BigYellow // 1.875in
1.10bar // 15.95psi // BigRed
1.35bar // 19.58psi // BigGreen
1.5bar // 21.75psi // BigBlue

Wastegate - 38/40mm

BAR // PSI // Color // OD

0.25bar // 3.63psi // Sm. Yellow // 1.875in
0.4bar // 5.80psi // Sm. Red
0.5bar // 7.25psi // Sm. Green
0.6bar // 8.70psi // Sm. Blue
0.7bar // 10.15psi // Big Yellow 2.36in
0.8bar // 11.60psi // Big Red
0.9bar // 13.05psi // Big Green
1.0bar // 14.50psi // Big Blue
1.1bar // 15.95psi // **
1.2bar // 17.40psi // **
1.3bar // 18.95psi // **
1.4bar // 20.30psi // **
1.5bar // 21.75psi // **
1.6bar // 23.20psi // **

Wastegate - 44/46mm

BAR // PSI // Color // OD

0.2bar // 2.90psi // Sm. Yellow // 1.875in
0.3bar // 4.35psi // Sm. Red
0.4bar // 5.80psi // Sm. Green
0.5bar // 7.25psi // Sm. Blue
0.6bar // 8.70psi // Big Yellow // 2.36in
0.7bar // 10.15psi // Big Red
0.8bar // 11.60psi // Big Green
0.9bar // 13.05psi // Big Blue
1.0bar // 14.50psi // **
1.1bar // 15.95psi // **
1.2bar // 17.40psi // **
1.3bar // 18.95psi // **
1.4bar // 20.30psi // **

*All Standard WG35mm Springs can also be used for WG35mmHP

**You can combine Big&Small Springs to get the PSI that you need for HP

Modified by Hoosier Daddy at 3:42 PM 5/7/2004

replacement diaphragm $59 http://linux.forcedperformance.net/merchant2/merchant.mv?Screen=PROD&Store_Code=FP&Product_Code=TID&Category_Code=UNIV-TiAl

[xenocron]

Based on those pictures…I have a 35mm top with a 38mm body…weird.

[Stu]

@xenocron

Based on those pictures…I have a 35mm top with a 38mm body…weird.

Me too I think.

[XDEep]

hm thats a relief then.

@ben@importparts.com

The 38mm wastegate in silver will be the same size. They use the 40mm top for other colors and it is taller.

from that im assuming that initially the 35mm top was the standard top for the 38mm as well, while the rounder, silver one (or any other color option) is the 40mm top and was an extra 10 or so. most of the current dealers seem to be offering the round, silver, 40mm top as standard.

[system]

TiAL switched to the 38 and stopped casting the 35mm, I dont know why, they just did, maybe a year or two ago.
I have a 35mm with a rounded top, it si a gray/brown annodized color. My friend has a 35 also, but his does not have the rounded top (he has the squared corners) and his is bare aluminum color. We both bought them brand new, but at different times. I think TiAL used both tops on both valves depending on what they had in stock when they are assembling them. Dont worry, just run it and hope you put it back together correctly.
P.S. The RWD AEM/Driver FX.com Pro-drag car uses two 38mm Tial wastegates. TiAL is the shit.