What he said.

Actually, I chose the 52 over the 48

1. The intake is 52 (so why not?)

2. I actually believe the 52 gives me better thottle response. Could be my imaginiation though. JMHO

 

so if i have no muffler then i will actually lose some horsepower?

 

What information, posted above, led you to that conclusion? You do not want pressure in your exhaust system. So, removing the muffler eliminates pressure buildup. It will improve performance, assuming the PCM correctly adapts to the improved volumetric efficiency.

Your hearing may suffer though....

 

The only real problem with the stock throttle body is the way it is made. I did some side by side testing on a stock throttle body and my modified one. The modified one uses two inserts that I made which look like velocity stacks. The only other difference was that I went up to a 2" butterfly from a Holley Dominator. The shop that did the flow testing, noticed several things. First there was an increase in flow that was to be expected. The other was that the modified throttle body pulled the air in very smoothly, the stock had vorticeis all over that the wonderful area between the throttle plates. Also he noted that at various throttle positions, that the modified throttle body was more efficent (by efficent I mean it was able to pull more air in at smaller balde angles than the stock one) due mostly to the fact that the incoming air was entering the throttle bores smoothly.

I wish I would have tested the stock one with an air foil but I forgot to leave that with them.

Fuel injected engines are very different from carburated cars. On a fuel injected engine it doesn't really matter how much air the throttle body can flow. At WOT the engine is only going to pull as much air as needed. So if your motor doesn't require any extra air above what the stock tb can support and you stick bigger one on, you will most likely not see an increase in overall power. But the larger tb might be more efficent at low and mid throttle so you'll feel like you've gained something but not really. On the other hand Carbs need to be matched so that you get good fuel distribution at WOT, and changing how much air a carb can pull will greatly effect the performance of the car.

 

The GM Ramjet 502 (502ci and 502hp) uses the same size TB as the LT1. At least it looks the same.

Rich Krause

 

Inguneer,
I have done some internal mods to my LT1 hopefully to give me 380 RWHP. Is what your saying, my 48mm stock throttle body is good enough to do the jod?

 

I don't think there really is a set limit for the tb. The faster the air goes through there, the more of a restriction it becomes, and the better off you are getting one. So more hp=more restriction. But the 400-450 rwhp area is where most people say it is actually worth it to get a bigger one, because the gains are substantial enough to justify the price. For instance, if you have a stock LT1, upgrading the tb would net you a few rwhp, but probably not enough to be worth the price. If you have a 800 rwhp LT1, the gains would be much more substantial and would be worth the trouble.

If I were you, I would look elsewhere for right now to make my car faster. There's lots of suspension and drivetrain mods that would offer a much better seat of the pants feel. Gears or stickier tires would make you much happier than a new tb would.

 

[QUOTE]Originally posted by GreenDemon
I don't think there really is a set limit for the tb. The faster the air goes through there, the more of a restriction it becomes, and the better off you are getting one. So more hp=more restriction. But the 400-450 rwhp area is where most people say it is actually worth it to get a bigger one, because the gains are substantial enough to justify the price. For instance, if you have a stock LT1, upgrading the tb would net you a few rwhp, but probably not enough to be worth the price. If you have a 800 rwhp LT1, the gains would be much more substantial and would be worth the trouble.

If I were you, I would look elsewhere for right now to make my car faster. There's lots of suspension and drivetrain mods that would offer a much better seat of the pants feel. Gears or stickier tires would make you much happier than a new tb would. [/QUO TE]
Thanks!