Is this fuel setup ok?

[Aceman]

I recently bought my GST and it had an 18g, SAFCII, and Innovate Wideband +LC1 on it, but stock fuel pump and injectors. I have done alot of searching and reading and have come up with this set up for what my goals are for now and I want to just double check with you guys to see if I am correct:

Already on the car:
Greddy 18g
SAFCII
Wideband + LC1 and Logworks wideband logger

What I think i need:
650cc injectors
Walbro 255HP Fuel Pump
Fuel Pump Rewire

I'm basing this off of the DSM Tuning Sheet v2.1. Also, I dont want to get a better logger right now. I'm thinking this will be fine if i keep the boost under 20psi and I'm not sure if I need an AFPR. I don't really have a very specific HP goal right now, but I want a safe tune at around 10.5 AFR with IDC's at 80% and anything over 300hp to the crank is fine for me, getting traction is an issue already and its sitting at 10psi right now to be on the safe side. I don't know what the wideband readings are as of yet because I need to recalibrate the sensor because it was disconnected and therefore reset before I even knew what it was for...heck, if the AFR is fine as it is I might not do any of this, but if I upgrade I want to do it right.

I know this isn't pushing the 18g, and 650s won't from what I understand, but thats not what I'm trying to do. Its my DD, I dont want to push it. I want an upgrade I can afford, while still making the right choice. Any advice would be greatly appreciated : )

 

[redyute1]

wally 255 = AFPR

 

[91TSIallday]

yes a wally 255+650's=AFPR!

 

[Aceman]

wally 255 = AFPR

...what? Correct me if I am wrong, but wally 255=Fuel Pump and AFPR=Adjustable Fuel Pressure Regulator

Here are some quotes from a thread dealing with the issue:

"You can't tune out overrun. To avoid overrun on the 255, invest in an AFPR."

"the 255 will definitively over run the stock fpr"

"You don't need an AFPR with a 255 unless you are running over 500 hp."

"Just my experience I changed my 190 for a 255hp and without the afpr the car idles like trash. When I put the afpr on the car everything is golden now."

And here is the whole thread: Walbro 255 Pump w/ DSM Link but no AFPR?


AFPR

Walbro 255hp

 

[djordan97]

I would like to know why people think the walbro 255 will out run the stock fpr. I run a walbro 255 with stock fpr and have absolutley no problems with my car and I'm running 1000cc injectors. stable afrs at 11.5 and 20 psi boost. oh and I didn't rewire the fuel pump.

 

[Nick2gGST]

What does rewiring the fuel pump even mean? I've never heard that on any other of my car's forums.

 

[ClipseAPG]

Rewiring the fuel pump is getting a thicker gauge wire to feed voltage to the fuel pump. With the stock thin wire, voltage is erratic and can't properly power the fuel pump. More voltage = more steady fuel. Also, yes, you want an AFPR if you plan on using the 18g as an 18g and not at the less than T-25 pressure you're running it at now.

 

[ClipseAPG]

You might also want to get bigger then 650cc injectors now if you plan on ever turning up the boost later on.

 

[Nick2gGST]

Oh cool, I'll have to check for a diagram on that.

 

[Aceman]

Rewiring the fuel pump is getting a thicker gauge wire to feed voltage to the fuel pump. With the stock thin wire, voltage is erratic and can't properly power the fuel pump. More voltage = more steady fuel. Also, yes, you want an AFPR if you plan on using the 18g as an 18g and not at the less than T-25 pressure you're running it at now.

Thank you. Here's the thing though, I didn't put the 18g on it so I had no plans. Like I said, I'm not trying to get a whole lot out of the 18g, I was planning maybe 15-17psi. Its alot bigger than the T-25 so its not like 10psi on the 18g is very similar to what the T-25 is like at 10psi from what I understand. I don't even have a LSD so I dont even think it would be worth going very big with it. I just want to know what injectors and fuel pump combo will be efficient at 17psi max on the 18g and if I need an AFPR for that low of boost on it.

 

[->PrOjEcTGS<-]

You might also want to get bigger then 650cc injectors now if you plan on ever turning up the boost later on.

Yes, larger injectors are recommended. But, you have to remember that he's trying to keep this simple and he is tuning with a SAFC-II not DSMlink. 650's are as high as he can go on a SAFC without running into too many timing issues.

Now, if he has access to E-85 I'd tell him to get 950's or 1000's.