Ultra XP850 Almost there!

Ironmike said
Update! if you've been following, I was a little rich at cruise speeds 40 to 60 MPH. Had 34 MAB's all four corners. Mr Turk had a coniption, saying they're way too big. This goes AGAINST what Holley tells you in all the manuals, books, etc.

He suggested going to 26's and 30 at MOST. Again, exactly the opposite of what my book says.

So I tried his advice. Beautiful day today so I took a little ride with the 34 MAB's still in there. Nice level roads cruising at 45 to 60 my gauge shows 13ish to 1. so just for the hell of it i did what Holley says to lean it down and installed 37's. Wow. 11.6 to 12.5 to 1 on the same roads.

So now I follow Newbomb advice and go smaller, down to 30's all 4 corners. 13.5 to 13.8. Again same roads. Holy sh$% I think he's Right again!

My plan now is to just stick in the 26's and it will probably be exactly where I want, since I picked up half a point going from 34's to 30's.

Have done nothing with emulsions.......yet.

So Newbomb..........you were right again. I'm eating crow for dinner.

No need to eat crow. You did the best thing, and that was test what you were being told. Even if the results had been different you’d still get a gold star for doing the work and posting the results.

Obviously I would have wanted to know why the results were different than what I thought they would be, but you did the testing.

Most guys don’t do that.

On top of being counterintuitive, you have to overcome the inertia of reading books by highly regarded authors who certainly have more gravitas that I ever will have.

They are recognized experts in the field and I’m just an internet blowhard who usually doesn’t give an inch of ground.

So kudos to you for doing the work!

Maybe your results will spur others on to do what you are doing and we can take some of the inertia away from the holleyitius machine.

I suggest that when you get the MAB situation settled, get the main jetting back to where it should be, get your power valve timed correctly and then get your emulsion under control I think you will find the Holley carb, when correctly calibrated for the application will make more power than any other carb out there, get as good as fuel mileage as other carbs, maybe better and it will carburate like EFI.

It takes some work but in the end the effort will pay off bigly.

OUTSTANDING JOB!