Proiroc

Hi! I got a 383 procharged engine, have just fired it up
Air fuel ratio is around 14.7-14.9/1 is this to lean? I run a Q-ban 750 blow thrugh carb. msd boost retard ignition.. intercooled P-1SC

Tony89GTA

iTrader: (7)

For just crusing around that is good, for wide open throttle that will kill your engine. Shoot for 10-11.9/1 for wide open throttle.

The_rabbit1

11-14 is ideal

KS91Z28

Mid to high 11's is good for WOT

AC

iTrader: (3)

Anything above 6PSI shoot for <12.9 - Above 10PSI shoot for <11.4

Orr89RocZ

iTrader: (20)

Yep, idle/cruise 14 or so is fine. Under 6 psi I like to act like a n/a motor 12.5-12.8 or so air fuel. 6-10, 11.8-12.5 or so. Above 10psi, I'm running 11.5 or richer just to be safe. 15-18 psi right now i'm rich at around 10.5-10.7 or so on pump gas no problems. I want to shoot for 11.5 if it will take it. 11 to 1 wouldnt be bad tho.

AC

iTrader: (3)

10.5!! Cough cough cough, you're like me though, no cat right? LOL.

Orr89RocZ

iTrader: (20)

yeah no cat on this car Its rich but doesnt appear to be blowing black exhaust smoke and really doesnt smell from what I can tell. Makes me wonder if my wideband is reading right

AC

iTrader: (3)

Good note to mention and it's really adressing the OP's question. A WB02 reading is only as good as the sensor. I've started reading some on optimum placement along the flow path. There's a temperature envelope that we have to be aware of, being on the wrong side of that leads to false readings and failure.

Orr89RocZ

iTrader: (20)

Well mine is probably not in a great spot being only about 8-9 inches from the turbine exit so exhaust temps are very very hot there. I'll have to recalibrate it and recheck everything.

Proiroc

thanks!! My Carb card says:
Primary Main Jet:76
Secondary jet:86
Pri Idle Air Bleed:70
Hi Speed Bleed:31
Pri Nozzle:33
Sec Nozzle:33
Needle / seat:130
Power Valve:4.5

Yesterday i changed The primary jet from 76 to 78, and Secondary Jet from 86-->90.. A/f ratio has gone down From 14.9 to 14.8...NOt really much.. I Clarely have to Swich out something else, Even bigger Jets?

Duts87ss

iTrader: (10)

For those of you that are fuel injected. What kind of fuel system are you running? Would the Racetronix Walbro (for GN) pump I'm running be enough to fuel my 383 with a P1SC at ~12psi?

Orr89RocZ

iTrader: (20)

If its a decent cammed/heads 383, it may be approaching 600whp on 12 psi. That usually requires 2 pumps.

An option to try is to get a boost-a-pump kit which just runs hot voltage to the pump to get higher output. It may wear out the pump faster in the end but may support 550-600whp.

3rd gen Will

iTrader: (8)

My buddy is running a 355 w/ an F1 @ 15lbs, has a single walbro w/ a KB Boost a pump, not running out of fuel.

Duts87ss

iTrader: (10)

Any advice on the best way to set up a dual pump system. I guess I'll go ahead and start looking for a double pumper hanger for my tank.

86Z

iTrader: (4)

i run an internal 255 and the supplied procharger pump external, i have no fuel issues, 42lb injectors 14psi boost, i dynoed 380/420 to the wheels

Duts87ss

iTrader: (10)

Yes, but I shouldn't be making too much less than that n/a. With the charger, I may be pushing near the limit. I like to leave a safety margin.

Is the boost-a-pump the same as a hot wire kit (I have one of these already)?

3rd gen Will

iTrader: (8)

The boost a pump is a voltage regulator/booster for the pump. It boost's the voltage to the pump beyond 14v. here is a link to the Kenne bell ones, MSD makes one also.

http://www.kennebell.net/accessories...boostapump.htm

Orr89RocZ

iTrader: (20)

Dual pump system you can run just like how NoboostNoGo has done in his build thread. I had Lonnies Performance make my kit for my 4th gen tank. turned out nice but it wasnt that cheap.

You can run the second pump with a hobbs switch which will activate upon a certain boost pressure. I'd get one with about 5-6 psi activation. Other way is to run the pump with a WOT switch so both are on no matter what boost your at. Or you can do it with a window switch to come on at a certain rpm, but out of these 3 ways I like the hobbs switch.

Some have wired them so that both pumps are on the same time but I dont like that since you dont need the pumps running constantly. This will heat up the fuel alot more and wear out the pumps faster.

3rd gen Will

iTrader: (8)

Yea noboostnogo setup is pretty awesome!

Jay_Rich's setup is great also!

Great pics and info on both of there threads.

Proiroc

So where is the best place for the O2 sensor?

Duts87ss

iTrader: (10)

http://www.turbobuick.com/forums/gen...placement.html

86IROC57L98

Oh man! Orr89RocZ i just went throught your build thread that is very good looking for custom done and i notice your in houston too. im N/W ( unfortunately where everyone thinks a cold air makes a honda go 200 mph lol) i hope i see this thing around sometime!!!

pajama sam

iTrader: (5)

do what i did and make ur own fuel pick up and run a weld on a1100 external pump or a1000 super easy to do

Orr89RocZ

iTrader: (20)

Not likely...the car is in PA where I moved from 9 months ago I dont plan on bringing it down here anytime soon as I'm not sure how long I'll be in TX

gta324

I've done 2 setups with dual pumps in 3'gen tank.

picture of first one
https://www.thirdgen.org/forums/powe...ps-inside.html
http://medlem.spray.se/gta324/mods/misc/pics/dual.jpg

second one, ( when I needed bigger lines)
http://s373.photobucket.com/albums/o...Fuel%20System/

I activate my 2'pump @ 2psi or by a switch......