If you buy a Holly Carb Intake Manifold with EGR......

Can you......place the nitrous kit for a carb on the intake manifold....then on top of the nitrous plate add a CARB to TBI adapter....then fianlly the TBI unit??

Is this possible or am i totally thinking off track???

 

Sounds good to me.

 

Yup

Or you can put a TBI nitrous plate on top of the carb/TBI adapter, then put on the TBI unit.

AJ

 

You'll have to use a low intake manifold or use something other than the Holley adaptor. My Performer RPM and the Holley adaptor brush up against the bottom of the hood. I emailed NX about putting a spray bar though my Holley adaptor acutually, and they said it could be done. That would be trick as hell.

 

I'm in the same boat! If and when I go with some N2o I'll probably make my own 1/4" adaptor instead of using the holley 1". That should leave me with enough room for a low profile plate.

 

the carb nitrous plate will only work properly if the spray bar lines up under teh tbi bores.
if the spray bar is not exposed to a draw of intake across it a large portio9n of the charge will get caught in teh low speed and highly turbulant air that is in teh dead spot between the openings of the bore and the larger intake opening.
it will work ok as long as most fo the bar is exposed under teh bores. but i woudl say if it covers more about 1/3 of teh bar jsut spend the money on the tbi plate instead. there are platees for tb's with 2inch bores too, just look on holley's site under teh NOS section. the systems are listed for 454 tbi's.

later
tim

 

You said something about that to me on aim, Tim. What if it went directly though the bores on the tbi adaptor, something like:



Sorry for the quick photochop. Theres pleanty of room there to put it on.

 

I dont completely understand this. The spray bars dont line up under the holes of a carb, so why would they need to line up under the bores of the tbi?

 

He is saying that the spray bar which actually "sprays" the nitrous into the line of fuel must line up underneath the holes of the TBI....

If the nitrous is NOT sprayed in the line of fuel and rather is sprayed outside of the flow of fuel it will mess up and not work correctly....

Think of a tornado as the line of fuel...

You want the nitrous to be in the middle of that tornado, so it works properly and gets mixed in with the fuel, If it's outside of the tornado it just simply builds up and goes every which way, not where it is intended to go.....

The spray bar made for a Carb, MIGHT not line up with the bores of a TBI....

Wow, this was a long time ago, when i was interested in performence for the 305, lol.....

 

The spray bar for the nitrous doesnt only spray nitrous. It sprays nitrous AND fuel. So it would not need to be under the bores of the tb. If you look at a carb setup, the nitrous doesn't line up under the bores so why would it need to line up under the tb?

 

I think Tim was concerned that the "crosslace" design of the carb nitrous plate might lay directly under the TB-to-carb adapter.



That could be a problem if you put the plate in upsidedown (but it would ALWAYS be a problem if you put it in upsidedown ), but otherwise it will be OK.

Something we can actually learn from Honduh boys is how they put the jet/nozzle in the cold air intake tube BEFORE the TB. The nitrous has to go over, under, through and around many curves, including the TB, before it reaches any fuel. So if it works OK for them, then it's gotta work OK in a wet-flow system like ours.

 

That's what I'm saying. See how the spray bars are directly in the center. On a 4 barrel carb the bores are on each corner and aren't under the bores of the carb. Plus you can get plates with only 1 spray bar, not 2. I think a carb nitrous plate would work excelent with a carb manifold and a tbi adaptor plate. I don't see why they wouldn't work well with tbi, but I could be wrong. The only thing I might be concerned with are the different fuel pressures between a carb and tbi. You might need to use smaller jets for the tbi because of the higher fuel pressure.