In our experience, if you are still running on the OEM Throttle shaft seals, you most likely have a boost leak. With ‘03/04 Evo's, we have witnessed an 80% chance that your OEM throttle shaft seals are cracked.

If you own a 05/06 Evo, those odds increase to over 90%

MIL.SPEC seals are metal cased, like the OEM units, but offer SUBSTANTIALLY more lip seal thickness.

OEM seal:


MIL.SPEC seal:


Our vendor claims they can hold 50+ psi, but we have only tested them to 35psi on one of our cars during a boost leak test with ZERO Leakage

This is a good idea whether you're running a ported throttle body or an OEM unit.

For more info, along with how and where to order go here:
https://www.evolutionm.net/forums/sh...d.php?t=364108

 

Looks good!

 

Why dose the 05/06 odds increase? I would think the older VIII would have a higher rate.

 

You would think, but I am just relaying our experience.

Regardless of which year TB you have, there's a good chance it's leaking...the kind of odds I'd be willing to bet large sums of money on

 

I just installed these this weekend.......price was right, shipping was fast.

I installed the machV seals about a month ago and after the install I boost leak tested them and they leaked right away (imo they just aren't a good seal). I know, i should have bought the works seals, but its against my religion. Thankfully i heard about these seals and promptly order them - after installation I had 0 (audible) leakage from the TB and all is fine n' dandy.

Long term test will just have to wait and see - im confident they will hold up to the test.

Thanks

 

I installed the works ones when i did my Magnus b/c I didnt want to pull it off twice. Im sure I stopped some leakage. If these seals ever fail or I port my TB I will send it to you guys and get these, they look great.

 

Do these seals come standard in your 65mm throttle bodys?

 

Of course

They are complimentary, included at no extra cost...even FREE if you like to look at things that way

 

I dont know why the 05/06 tb seals crack sooner.....but i know they do. I have seen a cracked seal on '06 tb with 1835 miles on it!!

I have only seen cracked seals on the throttle cable side of the tb as well......not sure why

 

i have a question. is zero leakage really zero leakage?
can you pump 35psi in there and have it hold indefinitely, or is there some acceptable bleeding allowed. i did a boost leak test the other day and still run the recirc dump valve, so i had to block of the rocker cover vent and some other hose going to the what i believe is related to some fuel apparatus since they would both cause leaking.. even after doing that pressure would bleed off, but without any audible leaking.

 

More torsional load. The shaft has more play on that side of the TB.

 

any How-to install?

 

We're working on a how-to install. However, Aby and I have very busy schedules at the moment.

We have also had some shops inquire about larger orders, and larger orders are not a problem. PM me with any questions and volume discount inquiries

 

 

MILSPEC get full props for TB that don't leak I put my foot on it 44+ psi daily and it HELD!