moving the carbaurator closer to the turbo

[yellowscorp]

Before I start. yes I know I should do FI. Not in the budget for now.

Now....

I want to move the carb from it's stock place on the intake manifold and mount it up close to the turbo to reduce the inlet length. Has anyone seen a pre-made (as opposed to me making it :) ) bracket with some sort of down pipe that could be used in this regard

Carb: 34 DMTR
Turbo: Rajay.

Any help would be appreciated :D

[Will]

I'm not sure you stand to benefit by this a great deal, I would think that you'd be better off having an inlet tract thayt was pressurised, rather than one that was pulling a vacuum, in either case the distance from your turbo to the inlet valve is the same.
If you want to achieve the same result as moving the carb, you could put in a throttle body in line just after the turbo, and then remove the throttle plates from the carb. You'd probably want to change to a synchronous carb, rather than a progressive carb, to make this mod.
If your intent is giving the fuel more time to mix, you can relocate the carb entirely, in this case you'd want to change to a sidedraft type carb so that the inlet tract could make an uninterrupted pass from the turbo to the intake manifold without all of the airbox, etc. A formed tube with some creatively welded endplates should achieve this.
IMHO, of course.
-WIll

[John Allen]

Hey Alan.... I tried to respond on the 'old' site but DJ informs me it was lost.

I still need to come by and see your final setup, give me a call or email sometime.

Anyway, most people aren't familiar with your setup. It has the draw through carb mounted in the stock location with a one-way valve under it that allows the mixture to by-pass the turbo when not under boost.

You are correct in your assumption that you will decrease the pressurized volume by moving the carb to the inlet of the turbo, but you will sacrifice throttle response when off-boost as well as making it harder to start. You will INCREASE the length the mixture has to travel when off boost (as the one-way valve allows a straight shot to the intake manifold).

There are many adapters to mount the carb to the inlet of the turbo, as this is the method used on most kits. I can't think of a specific manufacturer at this time, but they are out there. I'm not sure you'd gain anything from this change and I would guess that any effort should be put into FI or blow-thru carbs, not improving the draw-thru variant.

Later
John A

[Will]

Sorry, I had ASSUMED it was a blow-thru by the words "stock carb location on the inlet manifold".
-WIll

[Wallace]

I wouldn't totally recomend blow through - the "turbo" carbs on my engine pissed fuel out of them at the boost I was running .. . .(14psi) !!

[yellowscorp]

The setup works as is, but the issues are:
1. There is little or no boost unless under almost full throttle. Which means a heavy foot to gain boost.

2. fuel tends to pool up in the turbo housing when cold, or driven off boost. This produces a. bad fuel economy, b. upon startup a big cloud of white smoke as the excess fuel burns and chokes the engine (this only visibly happens at startup on a cold engine.

Other than that it seems to work great.

Thanks for the input.