I searched and came up with posts that went no where... I found this on ebay and I was wondering if it would be of any use...

http://cgi.ebay.com/ebaymotors/ws/eB...category=33558

My friend has one on his TBI 350 in his Blazer, and he said he noticed a difference.

 

It will increase the flow of money out of your wallet. Just think of it as another way to decease the airflow in a already restricted design of the TPI.

 

Thanks, I thought I'd never get an answer!

Is it not benefitial to the TPI, or just any engine?

 

Thats ridiculous. I can't believe people get away with selling that kind of item to people. They may aw well claim 50 extra horsepower, lying is lying. They have no basis on which to claim extra horsepower, hahaha.
A spacer on a TBI is different I think, because it changes the velocity of air into the engine, whereas here, they claim it makes a swirling effect. By the time the air changes complete directions from the plenum to the runners and makes it down to the injectors, I'm sure theres no swirl effect left to 'improve atomization and create a more complete combustion and an efficiently burning engine'

Jeez.

 

all that does is move the TB away from the motor. Thus increasing the distance for air to travel. You will lose power with that. Not to mention screw up the geometry of your linkages like the throttle cable and TV cable for the trans, which would raise your idle causing the engine to race, and the shift points will be all outta whack.

 

I am not so sure about the shift points going bad, but hey I don't have one of these babies! I know that the actual idea is increasing plenum volume slightly. Which is good for nothing. The plenum on our TPI units is NOT the problem. First the runners are, and then closely after them is the base. There in lies all the potential of the LTR TPI. Don't buy that piece of shiz! Get an airfoil, at least those have a much better theory behind them. I have an airfoil. Did it help? I don't know. It was cheap tho, and the idea makes alot more sense to me than the TB spacer.

That was my 12 cents. (about 6 times as much as I needed to or should have said )

 

I know people knock them as stated above, but I put one on my '93 Z71 Silverado and noticed a difference right off the bat: smoother throttle response and idle, and I still get 18MPG in a '93 4x4 truck with 190K on it. What it does is increase plenum size and runner length, which better mixes the fuel resulting in a cleaner burn. Granted, I'm using mine on a TBI. On a TPI, your first mods should include high flow filters, an air foil, and an AFPR.


Ed

 

I still fail to see how one could possibly improve performance whatsoever. Even if you did see some minute gain, look what you pay for it.

 

TBI is much different from TPI.

A TB spacer is actually a viable mod for TBI. A TB spacer is worthless for TPI. TBI sits on top like a carb, and has the two injectors making it a wet intake. TPI is a dry intake, with an individual injector for each cylinder. The logistics are totally different.

 

Thats what I was trying to say in my first post. You cant just slap a spacer on any type of induction system and expect gains. I have no doubts it affects performance on a carb/TBI, but TPI....I seriously doubt it.

I may as well start selling 2" longer-than-stock upper radiator hoses and claiming a more efficient cooling system. Cause you know, its longer, which means its better at cooling.

I'm sure someone would buy them

 

Sorry Eb, I just realized I read your post too fast. I thought you were strictly making an argument for the TPI spacer, not the TBI spacer.

 

That's OK. I immediately thought "TBI" and had to change my initial post or I would have looked like an idiot.

[quote]Even if you did see some minute gain, look what you pay for it.[/quoute]

Mine was free, had a friend make it out of spare billet he had laying around.

No harm, no foul...


Ed

 

The TBI/Carb spacer works because the throttle sits in the center of the intake maifold.

The TPI space is not a good idea because you have just moved the throttle opening further away from the rear most itake runners, possibly starving them of air.

The throttle body location and the plenum length are designed like that for a reason and should not be changed if using the factory plenum.