Back and running again

btw...

what pressure are you running on the fuel?

when I swapped to the electric pump (a stock intake GM pump nothing fancy) I needed about 3-4psi I think to keep from overcoming the needle. seems kinda low to me..

(aeromotive 11103 I think and a autometer pressure gauge 0-15psi and -6 supply and return lines)
 
My Holley 1946 will run fine all day on 7 psi base pressure. I never bothered to try it lower than that for some reason.
 
turbo_fairlane_200":t8s6cspg said:
btw...

what pressure are you running on the fuel?

when I swapped to the electric pump (a stock intake GM pump nothing fancy) I needed about 3-4psi I think to keep from overcoming the needle. seems kinda low to me..

(aeromotive 11103 I think and a autometer pressure gauge 0-15psi and -6 supply and return lines)

Steady 7psi base pressure with the new inline pump and the 13-301 Aeromotive FPR w/ 3/8" feed and 1/2" return.

3-4 psi on the GM? Sure your float wasn't too high, or worn needle/seat?

Kirk
 
the float might be to high. basicly I put it all together fired it up and sorta dialed in things for about 15 mins and put the car back in storage.

so should I turn up the pressure and then adjust the float to match?

I would assume lower the float level and remove the sight plug to keep from flooding motor and then adjust everything?
 
Check the float level while the engine is running, if it pours gas out, well then you know what.
Adjust the float with a wide blade flat screwdriver and a 5/8" box wrench. Turn the nut clockwise to lower the float, a turn of each hex flat on the nut will change the float level approximately 1/32". You want the fuel level just below the site hole, I always like to see just a little bit of fuel coming out, barely.
Make sure that you adjust the float with the engine off, or it will spray gas everywhere, I know.

You can adjust the pressure before or after, I don't think it makes a difference, though I may be wrong.

Kirk
 
Got everything back together and running, good at idle, but when I go for a test drive after about 1 mile, the engine just goes lean on me and barely runs. I adjusted the float, air/fuel mixture screws and upped the jets to #70's and lowered the PV to a 8.5 and still.
After this I took the bonnet off to adjust more and noticed that fuel was dripping out of one side of the squirter....VAPOR LOCK? You think from the turbo heat infront of the carb? Is this why it is going lean on me? I am buying a heat shield made for the t3 today.
I also for got to mention that I stripped out the threads in the metering block where one of the jet goes. Ordered me a Quickfuel metering block that has adjustable bleeds (great more stuff for me to mess with) from jegs, waiting on that will let you know.

Kirk
 
All righty, from futher inspection (yes I finally pulled the plugs), I am running too rich. The plugs, of course, are blacker than night. Even though I was reading lean on the wideband, it was rich...I have heard of this and now I can prove it.

This was with 10.5 PV, #70 jets, 0.081" pvcr's both restricted with 2ea. 0.008" wire. First off the pvcr's are way to big, I should have left them stock at 0.062" (I think that is stock), and that's about it. All four kids are driving me crazy and I need to put them to bed (wife works at night so I get everyone of them to myself, and now you know why I have taken so long on this turbo).

Keep ya updated.

Kirk
 
running WAY too rich can show up as lean on an O2 sensor. At the moment, I forget the exact reason why but if I think of it I will be sure to post. haha

Can't help ya with tuning the carb tho. Might as well be a slide rule ;)
 
Bort62":3htbp0wo said:
running WAY too rich can show up as lean on an O2 sensor. At the moment, I forget the exact reason why but if I think of it I will be sure to post.

Because the burn quality in the chamber is so bad and cold, even a fair bit of air won't get burned off. Bad flame quality.
 
Linc's 200":3sqro045 said:
Bort62":3sqro045 said:
running WAY too rich can show up as lean on an O2 sensor. At the moment, I forget the exact reason why but if I think of it I will be sure to post.

Because the burn quality in the chamber is so bad and cold, even a fair bit of air won't get burned off. Bad flame quality.

Thanks for that Linc. Yeah I have just been reading my plugs for now, and the gauge is there now for looks, only.

Got back from the sand drags/rock crawl event, and the holley had no problems, what so ever. Only issue is the transition b/tw idle and part throttle hesitating/missing. What I did since I was there most of the time on the rock crawl was up the idle to @ 1200rpm and fine tune the carb mixture screws, worked good. The holley with the spring loaded needle/seat work flawlessly on the rocks, no spits or sputters, and the lower fuel pressure (@ 3.5 - 4psi) helped out, too. Got the Quickfuel metering block and set it up back to stock specs of the 7448 holley (350 cfm 2-barrel). At WOT with 0.053" pvcr's I ran a 12.7:1 AFR (what meter indicated), this might be part of the denotation problems. I will open the pvcr's up to 0.060" and see how that does. I changed my PV to a 6.5 because I was getting fuel to soon at light load/cruise with the 8.5 - 10.5 PV's. The IFR's are a stock 0.028" and the IAB's are also stock at 0.070".

Once I got to the sand drags...well, I might as well tell you how I did first:

8 races, at double elimination:
6 wins
1 tie
1 loss (due to a bad start)

All races were against V8 engines in 4x4 vehicles:(1)289's, (3)302's, (3)351's and (1) chevy 350 on propane (lost to him on a bad start, yet he never pulled away and I was right next to him the whole run).

Only concern, pump gas sucks! Ran 18* total timing at 10psi boost (7psi base fuel pressure) and still denotation was there (had to let up on two races and the end) w/ 93 octane. And, fuel pressure was good when boost came on. Did not run any lower total timing, no time to change b/tw races.
I do need a new gas tank, though, come to find out it is full of dirt and rust. Had some issues during the practice races w/ no fuel up top due to a clogged filter, the one before the pump. It must have been the bouncing around the rocks that loosened it up and clogged the filter. I unclogged the filter and ran the races, hoping it would not starve me out (did not have an extra filter on me).

It was a fun weekend, that turbo inline six really proved itself off and on the (sand) track.

Whats the deal on E85 (I will read up/search some more on it)? Will (does10s), if you are reading, could you chime in if you don't mind.

Don't have any pics, myself, of the sand drags, did not bring a camera, but will see if anybody else does.

Kirk
 
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