48 Dellorto blow through hesitation at transition

[brookester]

I don't have much to go on here but the areas I would be looking into would be bigger idles, bigger pump jets or smaller venturis or a combination of the three. That would just be to clear the stumble when you stab the gas....and that's assuming your fuel pressure is right. You need a wideband for sure. Don't run it lean on boost. Better to start out too big on the mains and work down.
Only do one change at a time.

[brookester]

I just went back and read your other thread on this subject and it sounds like this has been covered.
Just to give you an idea I used 32mm venturis on my 2161 draw through to get the air speed up and it still made 250 hp. you might need smaller venturis than 30mm. Your wideband will help you when you get it. you never know it could be too rich.

[brookester]

[70turbobaja]

It seems I got it fixed I had a small vac leak. Im currently running 10 psi but the afr is not as rich as I would feel safe at. Should I go to 200 mains from 190?

[brookester]

What is your afr reading?

[70turbobaja]

13.9 in 2nd gear at 3500 rpm @ 10 psi

[brookester]

It can't hurt to try it.
How cold was it outside when you took your afr reading? That makes a difference.

[70turbobaja]

Mid 40s. I still dont really trust my afr. Is it really displaying at the moment readings? It seems when engine warms up and your driving that its always running a little rich but not to much. It feels that all it reads is twmp(which It does right?)

[brookester]

You might need to try the modulator rings. I know mine runs like poop without them.

[70turbobaja]

Do mod rings help up top or down low?

[miniman82]

They help on boost, RPM is irrelevant.

[70turbobaja]

And what happens if I dont use them?

[miniman82]

You might not get boost enrichment, though some have said you only need to boost reference the float chamber.

[70turbobaja]

And I assume by boost referncing the float chamber you mean putting the rubber hose that clonebug did on his build and just like brookester shows on the pic he posted? The hose between the main jet stack right?

[GARRICK.CLARK]

bump. Guys doing dell/weber blow through need to read this. I'm giving blow through another try.
I think I'll crack it this time.