how much boost?

[RS entities]

i'm just curious, but next weekend i'll be doing the first round of mods to my 1G turbo fwd. i'm installing full 3" exhaust, dejon uicp, water injection, and mbc. I was curious how much boost you guys think i could run before i start knocking or running lean on the stock fuel system? i'll be running 50/50 water/methanol in my water injection. i was thinkin 14-15 psi? i'll try to borrow a datalogger to see when i start knocking and timing gets pulled.

just curious
thanks
chad

 

[greathuskie]

put the water injection kit towards something more useful for the moment, thats one of those "play" type gadgets taht are just cool to have, but for now you dont need it

 

[NOSLO2PT0]

Can't run more than 15psi on stock pump/injectors. Once you re-wire the pump, you might be able to get away with 16psi, but don't go any higher until you upgrade the fuel pump.

 

[RS entities]

if i know i'm knocking at high rpm and on a hot day my car is definately slower for a lil over $200 what is better for the money than water injection? i think it is well worth it.

chad

 

[Tra2xx]

Originally posted by RS entities
if i know i'm knocking at high rpm and on a hot day my car is definately slower for a lil over $200 what is better for the money than water injection? i think it is well worth it.

chad

Triple that and just get a FMIC.

 

[RS entities]

well i don't have triple that.

 

[Ryan95tsiAWD]

255 HP walbro is just around $200 ....rewire is free for the most part.
try 16psi after that...

 

[NOSLO2PT0]

Walbro 255 can be had for about $120 new, rewire will cost you about $15 on avg. for the relay, power cable, wire connectors etc. i'd definitely do the re-wire/pump upgrade before water injection.

Mike

 

[NOSLO2PT0]

Walbro 255 can be had for about $120 new, rewire will cost you about $15 on avg. for the relay, power cable, wire connectors etc. i'd definitely do the re-wire/pump upgrade before water injection.

Mike

 

[NOSLO2PT0]

Walbro 255 can be had for about $120 new, rewire will cost you about $15 on avg. for the relay, power cable, wire connectors etc. i'd definitely do the re-wire/pump upgrade before water injection.

Mike

 

[RS entities]

can the stock fuel regulator handle a 255lph? i was under the impression it couldn't. anyway, i will definately rewire my fuel pump, i got plenty of 8 guage wire laying around.

thanks
chad

 

[Tra2xx]

Originally posted by RS entities
can the stock fuel regulator handle a 255lph? i was under the impression it couldn't. anyway, i will definately rewire my fuel pump, i got plenty of 8 guage wire laying around.

thanks
chad

No, it can't handle a rewired 255.

I put on my 255lph HP recently (I bought it for $100 with the install kit from a group buy, groupbuycenter.com)

Anyways, non rewired I am at about 40psi base fuel pressure with no adjusments.
You do have a fuel pressure guage, right? If not get one. And if you get a rewire, get an adjustable pressure regulator. (One that goes + and - )

 

[Ryan95tsiAWD]

hes right....you need at MIN a boost and fuel gauge before you change anything..but more fuel at your "stock" level is better than water inj.

 

[Tra2xx]

I just looked back and saw you are getting a 3" exhaust.

You will need to port the O2 sensor housing (especially the wastegate part) and also some of the turbo where the wastegate is, so the flapper can open up all the way. If not you will be getting mad boost creep