Carb issues farmall H help!

Hi everyone new here. I have a 1944 farmall h, 2 weeks ago we installed a new gt 2871 turbo tractor ran ok but seemed lean. So I bored out the main carb jet 2 drill sizes its the smaller carb not the zien if that helps. But sometimes it acts Rich and other times lean. I cant figure it out any help would be appreciated.

Is this a blow through or draw through turbo? It could be the fuel feed/inlet cant keep up with the demand.

I believe its blow through I didnt realize there was a difference one guy I saw on another post installed a electric fuel pump. My issue with that is Im still on a 6volt system and Id hate to have to change it just for a turbo upgrade but I may have to! Ive tried to adjust the flow screw at wot and it sounds ok until you go to drive it then it starts acting up and surging really hard.

You bastardized it with a turbo, and youre worry about 6 volt system???

Hello Dewitt welcome to YT. Interesting that you installed a turbo on a tractor not even knowing the difference between a
blow through or drawn through system. So if the compressor side of the turbo is hooked to the intake of the carb you
have it set up as a blow through system. In this case certain areas inside the carb need to be pressurized with the charge
air pressure as well. In other words when you start boosting the carb the pressure essentially pushes the gas back in the
fuel bowl out of the main jet. I am not in the know about what all needs to be changed to make that work. In the attached
archive YT post it looks like the poster did the same thing as you did, but yes he has a fuel pump on it. Using a blow
through system does get away from the lag of the fuel mixture changes; in other words throttle changes of a draw through
system that puts the carb before the turbo compressor. In some applications I have seen the carb placed in a enclosed
box that is all pressurized by the charge air. The fuel in that case would definitely need to be pressured with a pump
several psi above the max boost pressure. If you web search Farmall Keystone turbo you will see the kit they offer for a
350 which is essentially an H engine with more cubes. Their kit has a reconfigured intake manifold to accommodate a
draw through system going that way eliminates a lot of issues with how the boost affects the carb operation, but as said
above has other drawbacks. BTW poster 1949H with the turbo H in the post attached has not posted here since 2014.
Older YT post with turbo H

Im not worried about 6volt just annoying it cant run on its in when keystone obviously made it work.

thanks for the reply and that does make since didnt even realize draw through was an option. Always known blow through. I hooked a fuel pump up today and it seemed to do better still acts up it will run at wot in neutral. In 4th gear it will also run fine at wot but when you go to 5th it will surge really hard especially going up hill. I will try to post on the earlier post. I surely cant figure it out even with the help of the old timers around me.

As I said the Keystone system has a reconfigured intake
manifold so it uses a drawn through system. In that case
the carb is connected to the inlet of the turbo compressor.
So whether it is in vacuum mode or boost mode the carb
venturi system, internal circuit venting and incoming fuel is
still reacting to normal atmospheric pressure as it does on
a natural aspirated engine. Posting on that old thread will
likely gain you nothing. It will just come back to the Farmall-
IH section here. And I suspect most of the regulars over
there have seen this post. Gasoline fuel injection and
diesels are much better suited for turbo charging. Also due
to the way an IH carb and governor are connected that
adds another level of difficulty to moving the carb to allow
for a draw through system. That is why Keystone has a
reconfigured manifold so the carb can remain connected to
the governor.