DougR

Hi guys,

Well my K03 is toast, so I'm going to be upgrading to a K04. I've done a lot of reading over the years, and recently too, but I could use some advice on exactly what to do along with the turbo. There seem to be as many different approaches as tuners!

I have a 2000 A4 1.8TQM with about 90,000 miles on the clock, an APR exhaust, a Bailey DV, and a brand new AWE stage 2 clutch and LWFW :-) I've run GIAC software for about 80,000 miles, and have been extremely happy with the P09L software. The exhaust manifold, catalytic converter, air box, and intercooler are all stock. I could probably be talked into upgrading the manifold and cat right now if the argument were compelling, but the air box is staying the way it is. I plan to upgrade the intercooler, possibly later this year, but most likely next spring.

The turbo will be a K04-015, assuming it shows up in the mail next week; the software will be GIAC; and as I mentioned, I won't initially have a FMIC.

So here are the questions:
1. What version of GIAC software?
2. What FPR: 4 bar, 5 bar, or adjustable?
3. Which injectors? Stock, or different spec?
4. Do I need to change the plugs?
5. How much boost should I run, or how much boost should I expect may be a better question?

I'm working with Shine Racing for the install. They plan to use an adjustable FPR with the stock injectors, and have advised me not to install a ported exhaust manifold. I don't know what they have in mind for the software version, or spark plugs.

Thanks in advance for your help. I realize none of this is breaking new ground, but I'm having trouble keeping the options and combinations straight.

Durrrrty Dufour

if you dont plan on getting an FMIC for a while go with the K05 programming from GIAC. with that you will need a 5 bar fpr. i believe the K05 programming spikes around 20psi and holds at about 17psi but i could very well be wrong.

then after you decide to get the fmic, go with an adjustable fpr set at about 3.7bar and 310cc injectors and run the J31 programming

as for plugs id go with plugs with a slightly lower heat range than stock. search the archives and you will find a couple different kinds that people reccomend

DougR

They don't seem to list it on their website. I'm no stranger to GIAC software revs, and the last rev that got me to the P09L made that same transition: a little more power than the previous version, and much much smoother.

After DUf's pointer to you in his reply I was able to track down some of your experiences. A J31 true believer!

So am I to understand that there's no way to deliver enough fuel for the j31 programming without bigger injectors? Or are you just hesitant to run the stock injectors at that high a pressure?

Thanks for chiming in.

DougR

Hey Duf, is this how you have your upgrade mapped out?? I'm guessing that an adjustable FPR will be fine from the start with the stock injectors then -- turn it to "5" :-)

Thanks for the pointer to mmart, searches turned up some good stuff..

DougR

I think that answered most of my questions:

1. K05 software, not K31 (at all,) or J31 (until FMIC.)
2. I need more fuel pressure, which I'll achieve with an adjustable FPR.
3. Stock (270cc?) injectors are fine for now.
4. I haven't found a specific answer on the plugs, but that's fine -- Shine will know what to do.
5. I can expect about 22 psi peak boost.

ShadowJet

j31 programming...need an FMIC tho

Audi2ptzero

but this setup tends to lean out a little up top. Using bosch 310cc injectors with a adjustable fpr set around 3.7 bar will give you a better supply of fuel across the board.

The K05 version is the newest version used without a fmic and hits a max of 22psi while the J31 hits 28psi max.

ModifiedA4

about the leaning out up top...would a mbc set to 20psi prevent that?

DougR

I thought I could compare the fuel delivery by multiplying the pressure by the cc's -- but now that doesn't look right (5*270=1350, 3.7*310=1147,) if the 270cc injectors go lean up top and the 310cc don't.

Audi2ptzero

270cc at 5 bar
The Injectors you have chosen are 25.710 Lbs/Hr (rated @ 43.5 psi) are now rated at 33.19 Lbs/Hour at a new fuel pressure of 72.502

310cc at 3.7 bar
The Injectors you have chosen are 29.519 Lbs/Hr (rated @ 43.5 psi) are now rated at 32.78 Lbs/Hour at a new fuel pressure of 53.651 PSI

Here is the specs for my setup right now.
The Injectors you have chosen are 76.179 Lbs/Hr (rated @ 43.5 psi) are now rated at 71.20 Lbs/Hour at a new fuel pressure of 38 PSI


The link below is the one I tend to use the most.<ul><li><a href="http://www.rbracing-rsr.com/fuelinjectors.htm">click here</a></li></ul>