T-28-Quattro de VT

From what we know about lower intake temps. Which is a better investment? Water Injectionor a FMIC?

Tron (///M)

Only because heat soak will kill that little IC that came stock with the car. Then on the other hand to get consistent #'s (by that I mean run after run)to the ground you will need the water mister.

Audi2ptzero

you can tune a chip to run with the FMIC giving you more adv timing to run with the lower air charge.

xr4tic

Each has it's pros/cons.

A FMIC is more expensive (especially compared to a homemade water injection unit) and has a pressure drop. But there is no fluid to refill or run out, and has less parts to fail.

Water injection has a side benefit of providing a "steam cleaning" effect in the combustion chamber, helping to get rid of carbon deposits.
The main problem is finding a place to mount the water injection pump. Space is at a premium in the A4 engine bay. Plus you have to keep the water reservoir filled. Of course, if you use the stock windshield washer reservoir, then you have plenty reserve.
If you also inject water before the IC, that will help prevent heat soak.

Either way, a chip may be needed to take full advantage of both. I saw timing advance 5-6 degrees with the WI on, flat-lining at 18, it probably could have run even more timing.

I have WI with the stock IC now, but I also have a Spearco IC core waiting to go in. Neither is needed right now, as it's 20 degrees outside, and my car is buried under snow.

T-28-Quattro de VT

without the new software? The thing is I just love the look of the aggressive fmic.

johnAWD

I'd go with the FMIC first, as it's a 'permanent' addition, vs having to worry about the water/alcohol level in the reservoir.

I've built a couple of pretty serious turbocharged motors, and have opted for the FMIC first and foremost. Not that water injection wouldn't do the trick - some of my turbo pals are using it with (seemingly) good results.

How about both?