Papasmurf

I am about to buy a racing beat intake manifold and an RB prepped 600 cfm Holley. I was just wondering if it would be enough for a 60-1 turbo, external fuel pump pumping atleast 255lph, a RRFPR and I don't believe it is a double pumper unless that is all that Racing Beat sells. Is it possible for me to just up the jetting to make it flow? I might buy another holley off of someone that is maybe a 700 and I was wondering if all the stuff that racing beat modifies if it all can be swapped over to the larger carb? Thanks anyone for your help.

Scott 89t2

first of all you can't use the walbro. you need a low pressure pump. carbs only use around 5psi.

2nd. I don't know if you can just use any carb. there may be special ones to use for blow through seups?? I'm not sure.

personlay I would never run a turbo carb setup. efi is the way to go. more money. but you have to pay to play.

Papasmurf

This is strictly a strip car. So even If I run high boost, I still only need a low pressure pump? Does the RRFPR make up for that? Like I say, the 600 is a racing beat carb, but I don't know about the other one. I am looking for around 400 HP on race fuel. THanks for the reply.

Scott 89t2

FPR would have to be a carb one as well. not an EFI one. I don't know if the carb ones come in raising rate or not.

Papasmurf

They do make a RRFPR for carbs but how can I boost 20 pounds or so when my fuel pump will only put out 5 psi?

Evil Aviator

The 600cfm carb will probably work, but its flow rate will depend on the engine's vacuum, so your porting will have a large effect on this. It's probably best to check with your turbocharger's distributor and ask them which carb to use. You should also check with Racing Beat to see if their carbs are turbo ready. Forced induction requires special carb modifications so that the boost pressure doesn't crush the floats or shoot fuel and/or air out of various orifices, screw holes, or gaskets.

The Holley carbs need about 6psi fuel pressure. If you increase the pressure, you will flood the bowl. Remember, carbs meter fuel from a vacuum, not from positive pressure like fuel injection. That also brings up another point in that you will need a rising rate fuel pressure regulator to maintain that 6psi fuel pressure as the turbo increases the manifold pressure, and therefore you need the fuel pump to supply at least 6psi plus your boost pressure, whatever that will be. You will also need a turbo bypass valve.

Are you sure that you want to use a carburetor? A blow-through setup is very difficult to put together properly, and is horribly outdated and difficult to fine tune. You can get a Microtech LT8 EMS for the same price as the RB Holley carb and intake kit, and the LT8 is good for whatever horsepower your fuel injectors and fuel pump can support. I'm with Scott 89t2, and would never run a turbo carb setup that is inferior to fuel injection across the board.

Evil Aviator

You need the FPR to meter 6psi output + the boost level. At 20psi boost, that means an output of 26psi at the FPR. The fuel pump will need to support a little more than 26psi output because there is some pressure lost through the plumbing from the pump to the FPR.

Papasmurf

My main point is to keep it simple for track use. I have talked to others who have run this setup said they liked it a lot, but always said tuning was the key.

Evil Aviator

I don't see what is simple about a carburetor, but to each his own.

813KR$

Atkins uses the 690 cfm on their supercharges, I would use something bigger than the 600, but I know nothing about turbo's?

pillage6

I have a relatively small carb for my turbo, but I don't boost over 12 psi and I don't run my car hard.

Either use a Mallory 4309 or a Malpassi RRFPR, they are good regulators.

You can use whatever fuel pump you want to if you have the right regulator.

Superrican

well i hear Marine carburetors work.........