[grandville455]

I would open up the booster holes, and open up slot restrictor to .075 if it were mine and send it

[charlie66]

So I drilled the 0.56 to .075 and then I drilled out the booster from 182 to 192.

[grandville455]

Originally Posted by charlie66

So I drilled the 0.56 to .075 and then I drilled out the booster from 182 to 192.

The Terminology here needs to be clarified lol, so the above is your boosters, and u drilled the holes from 0.56 to .075? what did u drill out to .192? what is loose? The banjos that boosters press into?

[grandville455]

The red arrow is transfer slot restrictors n blue is your booster pins

[charlie66]

Originally Posted by grandville455

The red arrow is transfer slot restrictors n blue is your booster pins

The .056 to .075 is the 12 holes in the red insert .

The booster was drilled from .182 to .192 which your saying is the banjo.

My transfer slots are .098..

[charlie66]

I found out that 2 of the booster are loose . Anyone know of a tool they make to tighten them up?

[charlie66]

The booster/ banjo was loose. I never messed with a 4500 booster before . so im learning ive done many 4150's in the past so its different for sure ..
But i got the pin out and loc-tighted it back in . It seems ok but im going to get some new ones .

[grandville455]

Blue arrow is the banjo , it’s what the booster presses into

[charlie66]

yes i understand now . That was drilled to .192

[johnta1]

are you talking about straight alcohol or e85? I went 30 percent ...

I think it's around 39%. (not much difference between E85 and E100 I think)

Straight methanol is about double.

[charlie66]

https://www.summitracing.com/parts/qft-14-218qft


These are called booster pins..

[grandville455]

Originally Posted by charlie66

https://www.summitracing.com/parts/qft-14-218qft


These are called booster pins..

Yes, wow u are using some big pins, mine are only drilled to about .183 on my 1200

[charlie66]

Originally Posted by grandville455

Yes, wow u are using some big pins, mine are only drilled to about .183 on my 1200

Those are just what i found . They have .170's that i can drill .

Ive been looking for a set being mine aren't in good shape.

Are you using E85 or gas? I don't remember you saying .

[grandville455]

Originally Posted by charlie66

Those are just what i found . They have .170's that i can drill .

Ive been looking for a set being mine aren't in good shape.

Are you using E85 or gas? I don't remember you saying .

They get sketchy to drill after about .185 real thin, unless u go to that bigger pin and the drill out the banjo for it, Are you drilling it out after installed in body? They shrink back down a tad if u drill them beforehand and need to ream them back out some after installed i have found, .180 Is fine for you no need to go bigger on pin. I'm on E85 now

[charlie66]

Originally Posted by grandville455

They get sketchy to drill after about .185 real thin, unless u go to that bigger pin and the drill out the banjo for it, Are you drilling it out after installed in body? They shrink back down a tad if u drill them beforehand and need to ream them back out some after installed i have found, .180 Is fine for you no need to go bigger on pin. I'm on E85 now

Ok i figured you were .


What it was , was i converted over to E85, so i drilled them in place to see if that worked out first . When i saw one was loose i took it apart and found the pin was like you said very thin and fell apart at the end . So for now i just put it back together with some loc-tight . The pins before i drilled them were 160's.

So now i will probably get the .170's and drill them .

I was thinking a bout getting the big ones and try them .. Not sure yet on what i will do. If having the bigger ones in there wont hurt maybe ill just get them . At least ill have growing room for the future.

For now i want to test the car and see if the changes i made make any difference. So far i got the car running and it sounds and idles real good. Today is a wet one so i have to wait.

On a positive note, The holes i drilled in the metering blocks and main body for the pump-shot feed seem to have made things better on the bog i was having ...

[charlie66]

Tested the car today and its still the same at WOT. At this point im not sure on what else to try. Anyone have any suggestions ? I just want to say that i really appreciate everyone's input so far ..

One good thing is that the bog is 90% gone now . So i have to work on that a bit more . But the lack of fuel problem at WOT really has me stumped .. I guess ill try a different carburetor because i feel like ive tried everything with this one ..

[grandville455]

Originally Posted by charlie66

Tested the car today and its still the same at WOT. At this point im not sure on what else to try. Anyone have any suggestions ? I just want to say that i really appreciate everyone's input so far ..

One good thing is that the bog is 90% gone now . So i have to work on that a bit more . But the lack of fuel problem at WOT really has me stumped .. I guess ill try a different carburetor because i feel like ive tried everything with this one ..

Do u have a pressure gauge where u can see it? That pump is probably to small or right on the edge! I never liked that pump, tried it years ago in my Grandville!

[charlie66]

Originally Posted by grandville455

Do u have a pressure gauge where u can see it? That pump is probably to small or right on the edge! I never liked that pump, tried it years ago in my Grandville!

No its under the hood. What pump are you using ?

What AFR are you at @ WOT ? Whats your target that you shoot for ?

[grandville455]

Originally Posted by charlie66

No its under the hood. What pump are you using ?

What AFR are you at @ WOT ? Whats your target that you shoot for ?

I’m using my fast afr meter which was for gas, n it’s hard to read cause it’s used but it looks like it’s around 12.0? I have the A1000 pump .

[charlie66]

Originally Posted by grandville455

I’m using my fast afr meter which was for gas, n it’s hard to read cause it’s used but it looks like it’s around 12.0? I have the A1000 pump .

Yeah thats what id like 12.0 or under .

I know what you mean . I have mine mounted on the dash right in front of me and its still hard to read .