Who has the yellow A4 "TUNE ME". Fuel pump question inside.
09-25-2003, 01:15 PM
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Who has the yellow A4 "TUNE ME". Fuel pump question inside.
I remember you (i think) installing a Walbro 255lph "high pressure" fuel pump out of a fox body stang. Do you have the specific part number you used? Any more info on where to get one? Thanks!
09-25-2003, 03:42 PM
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Should I do this???
I bookmarked that write-up a while ago. I have since made ~325hp on the dyno and installed a 3" exhaust and some other minor mods recently. I also have a tank of race gas waiting to try my 100 octane chip. I read that my pump is good for 360hp - which I will never hit unless I do a 2.0 conversion.
My O2 readings are ok, but my injectors are maxed. I am wondering if my fuel pressure is dropping a bit in the upper RPMS and that I may benefit from a larger pump. I am thinking that I will not know for sure unless I put a fuel pressure guage on my fuel rail and look at it in the upper Rs.
But then again - for $150 - why not just get the larger pump and know it will never be a problem...
Are there any down sides to such a large pump? Should I consider a used S4 pump? TIA...
My O2 readings are ok, but my injectors are maxed. I am wondering if my fuel pressure is dropping a bit in the upper RPMS and that I may benefit from a larger pump. I am thinking that I will not know for sure unless I put a fuel pressure guage on my fuel rail and look at it in the upper Rs.
But then again - for $150 - why not just get the larger pump and know it will never be a problem...
Are there any down sides to such a large pump? Should I consider a used S4 pump? TIA...
09-25-2003, 04:37 PM
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You really need a fuel pressure gauge to be sure....
there really is no downside though, other than the fact that it's not exactly a plug-n-play mod.
The reason I like the Walbro pump over the A4 or S4 pump is because I KNOW what it can flow. No guessing games, and no taking chances.
The reason I like the Walbro pump over the A4 or S4 pump is because I KNOW what it can flow. No guessing games, and no taking chances.
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09-26-2003, 09:54 AM
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251.7HP. According to Todd, with their dyno you should *1.28 (~22% loss)
<center><img src="http://pictureposter.audiworld.com/24886/dyno1a.jpg"></center><p>I went to AWE the day after I pulled an all nighter putting the kit in. I still had old plugs in there with a stock heat range + a few other problems. This was with my Borla exhaust and a OEM CAT that was hallowed out.
I apparently pinged a bit up top and according to my vag logs it was pulling back timimg as you can see from the plot in the upper Rs.
I have no idea what I will get now that I fixed a bunch of stuff. It will most likely go down some, it could even go up a bit - but prolly not much if any... dunno.
I apparently pinged a bit up top and according to my vag logs it was pulling back timimg as you can see from the plot in the upper Rs.
I have no idea what I will get now that I fixed a bunch of stuff. It will most likely go down some, it could even go up a bit - but prolly not much if any... dunno.
10-09-2003, 12:36 PM
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Re: Nice write-up, John!
Gotta agree John, I used your writeup as a guide and also dropped in a 255 walbro. I had one in my eclipse yrs ago and made a loud whining sound, but it's barely noticeable on the A4. I'm thinkin about trying ATP's 475cc injectors.. you think it'll work alright w/ a T28 program?
10-09-2003, 04:57 PM
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You'd need the T28 program configured for the larger injectors...
IMHO, the 475cc injectors just aren't worth it for the money.
I've been told Subaru WRX Sti injectors would fit, and I think they are ~550cc. The only drawback is they require a different style connector. PE 650cc injectors can be had for ~$550
440 injectors will support 300hp easy, and can be had much cheaper. I have to upgrade real soon, so I might have a set of 440s for sale soon....
I've been told Subaru WRX Sti injectors would fit, and I think they are ~550cc. The only drawback is they require a different style connector. PE 650cc injectors can be had for ~$550
440 injectors will support 300hp easy, and can be had much cheaper. I have to upgrade real soon, so I might have a set of 440s for sale soon....
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