VAP

this 4-5 years ago. I do not believe it's an intentional power-reducer but more likely just an INCREDIBLY stupid error/mistake. You have to remember something like this DEFINATELY has a significant negative influence on Audi's published city/highway EPA/MPG window sticker fuel figures. It's at least possible "maybe" Audi planned on narrow cone pattern injectors that were going to "thread the needle" past thru that obstruction then went back to ordinary wide-dispersal injectors when the bean-counters got a look at what narrow pattern injectors would cost.

Best I can offer is that trying to understand why someone does something/anything is a lot like a dog chasing a car, ie; once we catch it whatta we do with it!?!

red90q

if theres issues like this with the 7A head ??

VAP

where the injector is aimed and if there are any obstructions between the injector tip and the intake valve.

I "think" my 20V engines were clear of obstructions but I've always used RCE injectors because of their smaller/narrower, more fucused pattern that hits the valves rather than the runner walls 3"-4" upstream of the valves.

Using RCE's on my AAN/UrS4 was an incredibly good modification that cured a lot of related ails. Same on my TT. I just don't like Bosch injectors when used in cylinder heads with longer than 1.5" to 2" intake runners due to the fuel dispersal pattern always impacting the intake runners dramatically upstream of the intake valves. I will always prefer valve head fuel impact/dispersal to ANY/ALL other fuel-stream impact locations.

corne

What sort of results would you get with the stock injectors with this mod?

VAP

then later when injectors are more in reach you don't have to R&R the intake manifold to do this. Swapping injectors on these engines is a 20 minute task.

odelay12v

for myself this all makes even more sense to see you do this. some of the pluses of FSI is the high pressure injectors that atomize the fuel before it hits the chamber where ours has to heat up off the back of the valves to "atomize" which i see now a good part of it doesnt ever even get to the valves until bouncing around ..Very cool!!

islingtonaudi

So this is done in place of traditional gasket matching? I'd love to have one when I do my ports.

VAP

Not at all. This is done "in addition" to traditional gasket matching.

islingtonaudi

So a means to get the all important angle/slope to the valve. Smart.

VAP

Bingo!