I am thinking about turboing my engine but I keep hearing you need to get your carb turbo prepped and all. I was wondering, why do I need to do so? I only plan on running about 7-8 psi on my daily driver. Why does it need to be turbo prepped? Can anybody explain?

 

It needs to be modded to tollerate boost pressure going through it.

If you run a draw through setup the carb does not need to be modded.

Search, there was a good thread on draw throughs about a week ago.

 

Thanks for pointing that out. Now that I know that, where can I look to get the stuff I need for draw through? Does anybody sell a draw through kit?

 

Unfortunatly nobody is making any turbo kit for first gens.

Search for "draw through turbo" and ask guys who know way more than I do about this stuff your questions.

Robert at www.rotaryshack.com is who I'd talk to if I was going to turbo an FB. though I think he tends to do blow through setups with prepped carbs............

 

Crap, I will just see if he can help me then.

 

I've heard turbo-prepping a holley is a bit more complicated, changing out different parts, etc... dont quote me on that though, BUT on weber's and similar carbs, you have to make sure you have floats that can withstand boost. I believe the brass floats on some webers break/crush under boost, while the plastic ones are good to go. Also, you need to make sure that too much air isnt leaking out of the carb. I'm not sure how effective it was, but I used silicone sealant on anywhere that I thought might leak air and that I didnt need to adjust or remove for regular tuning. The way I see it, if youre leaking any air, that's air lost that could be going to your engine. How much air, well, I have no clue. I've looked over a lot of carb diagrams trying to figure out any problems that might arise from boosting with my weber, but I havent run across any, and my setup holds boost fine. Eventually, I would like to rig something up so I could pressure test the carb and check for leaks, but that's in the future.

 

Speaking of weber carbs, a 40 weber can with stand 11 psi before the bowls will crack, with dual webers, they could handle that a piece.

My stock honda carb can run on 7 psi before rejetting or anything. But yes you have to make sure that the carb can handle the pressure. Maybe some type of leakdown test would work, but i have no idea. Carbs arent new to me but turboing is. I was planning on running a 7 psi turbo from a firefly, but if i have to rejet and such, then i dont know.

 

Well the carb I am going to be running is a side draft Dellorto DHLA 48mm carb. I don't know if that can help you tell me if I can run a certain psi. The carb comes jetted already for a streetported motor, which mine is. Thanks for the help you guys.

 

hmm, I've never heard anything about weber bowls cracking at 11psi. Also, I dont quite understand what you mean by saying that running dual webers, you could handle 11psi a piece. Are you saying that you could run a total of 22psi of boost if you had dual webers? If so, that doesnt make much sense, both carbs would still be under 22psi of pressure. Just trying to clarify things. Anyways, I'm gonna ask robert about this thing about bowls cracking, see what he says.

 

im wondering about this as well, im planning on running about 10-12psi on weber carb, what needs to be done, guess ill let rotaryshack do it

 

detonation bad (cave man talking here people)