its funny to see 4-5 years worth of dyno talk and still no one has done it...

 

Why bother wasting pulls on a dyno? What's funny is to hear people still try to justify the money they spent on throttle body spacers and devices that get inserted into the intake to "swirl" the air...

Every few years, some noob pops up and argues it was money well spent and they can detect a difference. Placebo effect/wishful thinking. It's up to the person claiming the improvement to back up those claims, not the rest of the world to prove them wrong. He who asserts, must prove. It's a basic principle of logic. Until then, it's all conjecture.

 

I agree swirling air wont help anything in this system

The TBS has only 2 principals that I could see making it work, either additional volume or somehow helping the flow path into the plenum, and volume as well as air flow can be tricky items... unless you have access to a flowbench.

As for the waste of dyno time I haven't seen a dyno showing anything good or bad and from all I know the claims of smoother power could be coming from a noob or some who is moderately experienced.

 

I dont believe they are designed well enough to cause the air to swirl... or that the swirl effect would help any. Thats just marketing fluff to me.

Point is, taller plenums helped performance vs short plenums for old hotrods and what do these do that those didnt? I think thats some proof right there, but technically these are on a smaller scale (short/tall plenums were 4-barrel) so air velocities may be increased.

To be quite frank i've not seen one person try to be very technical in their discussion in this thread yet.... aside from RacerX.

Got 550km out of the tank of fuel, about average but I was driving with my foot into it more than usual.

 

The taller intake manifolds on the older V8s was to increase flow.

On the low profile intake manifolds the fuel/air mix would leave the carb and hit the floor of the manifold. Make a 90* turn and go into the runners, then make close to a 90* turn again and go into the ports.

The high rise manifolds eliminated those sharp turns. The fuel/air mix left the carb and went straight down the runners and into the ports giving the mix a straight shot without all those sharp turns.

Gadget

 

The extremely tall ones, yes.

However, the ones which were only a few inches taller still had effects compared to short ones.

 

http://www.truckblog.com/story-444-f...e_body_spacers

or this one:

http://www.mustangforums.com/archive...1982633-1.html

Throttle body spacing started in hot rodding to lower an engine's torque curve for better off the line performance and to smooth out lower end acceleration in some cases (it's cheap and simple).

A second thought is an exhaust system is a complex beast: back pressure, intake volume, throttle body bore, throttle body length, blah, blah, blah.

Every real review I have read or seen on a MPFI engine has not shown any benefit to HP or MPG.

 

I have one on a 2.7. I like it. I wouldn't mind getting a bored out throttle body though.