Throttle Body Spacer: Smooth vs Swirl

[93SierraWT]

Hey guys, I'm about to order a throttle body spacer and injector riser but I'm not sure which one to get. I've got a 93 K1500 with a 4.3 Vortec TBI in it. Would a smooth or swirl be more beneficial?

This is the one I've been looking at:

http://www.summitracing.com/parts/TRD-2733/

 

[Problem2420]

i have no idea if this would help ?
http://www.ttmotorsportsinc.com/theory/index.htm

but another question would be open spacer without seperate bores, i guess it all depends on what your looking for? do you want top end or lowend power?

mid rage or top end
http://www.summitracing.com/parts/TRD-2634/

mid range
http://www.summitracing.com/parts/TRD-2734/

low end or mid range
http://www.summitracing.com/parts/TRD-2533/

its all up to you, but im guessing all would be better then no spacer.

 

[93SierraWT]

Well it's not too often that my truck is under WOT so I'm not too worried about top end. Low to mid range is really what I'm going for. Do I need longer bolts or hoses?

 

[Problem2420]

Probably only fuel line fitting extensions.

 

[Southern Pride]

I ordered the smooth bore I think? From Summit anyway it comes with the bolts and gaskets and it was the one for mid-hi power. The TBI's already have great low end torque and nothing on the top end so why not balance it out?

Anyway, my 40mph punches got A LOT better But I also did some air mods like the powercharger and injector spacer at the same time as the TB spacer along with opening up my intake tube by replacing the stock air box with 3" pipe.

It helped my acceleration greatly, which is what I think they're designed for but my point is don't go expecting 20 hp gains or anything they're just designed to smooth and give a quicker response for acceleration. That's it.

 

[Playare]

I don't mean to hijack the thread, but where does this thing go?

 

[94blu1500]

http://www.cfm-tech.com/

they have some good reading on that site for throttle body spacers and the like

 

[MOBS]

An airgap spacer would be the most beneficial of all the spacer designs. Swirl-port spacers are a waste, standard spacers increase plenum volume, airgaps do that and allow both injectors to feed both banks of cylinders. Don't raise your injectors more than 3/8" or the streams will hit the bores of the tbi causing your air and fuel not to mix properly. If you break it down and actually look at the facts, on a fresh crate engine that's already been broken in with new injectors and nothing used on the engine, at WOT the engine only pulls around 460-470cfm through the intake passages, the tbi at WOT flows around 480-485cfm. So technically any cfm upgrades are a waste of time/money, although I've done them on most my trucks just for *****.

Replacing the cam, heads, and recurving/replacing dist for a higher rpm limiter will be what begins to justify cfm increases.

 

[gmcierra]

Completely different engine, I know, but I put a swirl one on my 2000 pick up and it actually "whistled" just cruising down the highway! I had to take it off, it drove me NUTS!

 

[MOBS]

Completely different engine, I know, but I put a swirl one on my 2000 pick up and it actually "whistled" just cruising down the highway! I had to take it off, it drove me NUTS!

The ones for the 96+ trucks are only for show, and can be an annoyance like you stated.