Big built time. Custom Ti exhaust, CF Shaft, Eventuri, and more!

[darren p.]

Originally Posted by Chrisyphus

After installing refreshed, but stock heads and a set of Schrick cams, he made 408 wheel horsepower.

292 or 284?

[Gottagofast]

Originally Posted by Chrisyphus

Thanks for the kind words!

Great question about the Alusil, but it is a common misconception that the Alusil is a coating. The entire block is cast from Alusil. No matter how much material is removed from the cylinder wall, there are still Silicon crystals to be exposed. The primary issue with Alusil reconditioning is that very few shops are willing to do it, and even fewer have the necessary tools to do it correctly.

The process is, essentially, bore to near desired diameter, diamond hone to the final desired dimension, then use a felt pad and the appropriate abrasive paste and reode the Aluminum away without eroding the Silicon crystals which were surfaced via the diamond hone.

In the end, from the piston ring's perspective, it only ever touches Silicon.

Meeting the correct roughness specs is critical because if you do not erode enough of the aluminum, the piston rings will scrape the Silicon and gall the walls, leading to a catastrophic failure, and if you erode too much, the Silicon crystals will not be adequately supported by the Aluminum substrate and be scraped out by the piston rings, filling your oil with Silicon particualates, and allowing the rings to come into contact with the aluminum leading to catastrophic failure.


We are firm believers in retaining the Alusil surface for any and all NA builds we do and for all but the most extreme FI builds.


Man, the G8x cars are incredible machines. I rode in one around VIR during IMSA, and it was... mind-bending. Awesome lap you had there!

Thanks for the detailed explanation. It's good to learn new things from the horses mouth than internet rumors. Consider me educated on Alusil!

I'd love to hear any and all updates regarding your 4.6L package when they are available. I'd like to keep my options open and Partee seem to be doing great things. I know the ITBs close at 8500 RPM on the stock ECU, yet the thought of a dry sumped 4.6L S65 revving to 9000 RPM keeps me up at night....

As for the G8X, they are insanely fast machines that are easy to drive and forgiving on the limit. Completely different ball game than a manual E92 and I'm glad they both exist.

[omgzirra_exe]

Originally Posted by Chrisyphus

In the end, from the piston ring's perspective, it only ever touches Silicon.

this probably explains why i lost compression in 1 of my cylinders on my 80k mile 4.4L lmao.

[Chrisyphus]

Originally Posted by omgzirra_exe

this probably explains why i lost compression in 1 of my cylinders on my 80k mile 4.4L lmao.

Ooooof. I was under the impression that VAC sleeves all of their builds, but either way... Oooofff. 80K miles isn't a terribly short life for a fully forged race engine, which is what VAC builds, but it isn't a very long life for a built motor in a street car either. Depending on your plans, call us if you want a superior build.

[Chrisyphus]

Originally Posted by darren p.

292 or 284?

292.

[omgzirra_exe]

Originally Posted by Chrisyphus

Ooooof. I was under the impression that VAC sleeves all of their builds, but either way... Oooofff. 80K miles isn't a terribly short life for a fully forged race engine, which is what VAC builds, but it isn't a very long life for a built motor in a street car either. Depending on your plans, call us if you want a superior build.

nah i did the non sleeve route.

tbh 80k miles out this engine is a miracle.

daily driving, canyon driving, track days. my lack of care.

[Gottagofast]

Almost finished with the exhaust:

[a5m]

Originally Posted by Gottagofast

Almost finished with the exhaust:

Attachment 3858245Attachment 3858246Attachment 3858247

Interesting setup. Will this be valved? I assume mufflers are titanium, who makes those?

From your earlier posts I thought you were going single tip on each side lol

[Gottagofast]

Originally Posted by a5m

Interesting setup. Will this be valved? I assume mufflers are titanium, who makes those?

From your earlier posts I thought you were going single tip on each side lol

Ticon Mufflers

Factory came with 4 tips, we weren't gonna short change it .

[Gottagofast]

Progression:

youtube.com/shorts/nDk_pD20BPo

[Thumbie]

Looks sick AF.

We are all eagerly awaiting sound clips when it's done. I am sure you are aware of this....

[Gottagofast]

Originally Posted by Thumbie

Looks sick AF.

We are all eagerly awaiting sound clips when it's done. I am sure you are aware of this....

What's worse than waiting? A teaser for new parts:

[Gottagofast]

Soon, very soon....

And then this happened...



Can't get a break!

[Gottagofast]

Just a recent visit to the shop....

[Gottagofast]

This is the car running fully stock, before we started hacking it up . At the ripe age of 175000 kilometers.

[Chrisyphus]

I am in love with the exhaust valve design. It is precisely how I have always wanted to do mine, if I had the time and ability.

[Gottagofast]

Originally Posted by Chrisyphus

I am in love with the exhaust valve design. It is precisely how I have always wanted to do mine, if I had the time and ability.

And money. I could have bought a mint condition E92 330i for the same price as this exhaust system.

[spammysammich]

Pssst… driveshaft. But I get what you meant. Nice weight savings.

[Gottagofast]

Got some numbers for you fellas.

Stock exhaust system header back weighed 100 lbs. The new catback titanium system with valve controller is sitting at 53 lbs.

The OE driveshaft weighed 22.4 lbs. The CF shaft is at 19.1 lbs. Not as light as I imagined but it's still gonna wake the car up.

Battery, Clutch/Flywheel pack is next

[Chrisyphus]

Originally Posted by Gottagofast

And money. I could have bought a mint condition E92 330i for the same price as this exhaust system.

Access to funding is part of the ability, lmao. You didn't have to call me a poor so directly hahaha I was trying to leave that out for my pride :P

[Thumbie]

Originally Posted by Chrisyphus

Access to funding is part of the ability, lmaoP

Yes, but isn't it fun to think about what our cars would be if that wasn't an issue?

[Gottagofast]

Some underskirt shots for us perverts out there:



The trans tunnel is pristine.