throttle body
throttle body
Postmaster
Joined: May 2002
Posts: 3,028
Likes: 1
From: Annapolis, Maryland
throttle body
The general consensus is that throttle body spacers give you a *slight* boost in power - like .0003% of a boost, and most of that is likely a placebo effect - but they cause whistling that gets louder relative to the throttle. I think most of the guys on the forum who dabbled with the spacers eventually deep-sixed them because of the whistling.
If you're looking for a boost in performance, ditch the spacer, spend a few more bucks, and get a 75mm (?) throttle body. I believe Deanjet put one on his truck (or it was RtpJunior, I can't remember which - those two might have to go to support groups because of their uncontrollable tinkering
) and liked it a whole lot. I'm sure they'll come across this thread soon, so we'll know within a few hours
XXL
If you're looking for a boost in performance, ditch the spacer, spend a few more bucks, and get a 75mm (?) throttle body. I believe Deanjet put one on his truck (or it was RtpJunior, I can't remember which - those two might have to go to support groups because of their uncontrollable tinkering
) and liked it a whole lot. I'm sure they'll come across this thread soon, so we'll know within a few hours XXL
Senior User
Joined: Feb 2003
Posts: 369
Likes: 0
From: Bronx, New York
throttle body
I will take that as a complement, Matt.........The throttle body spacer falls into the category with the Tornado, Slick 50, as well as most other products advertized after 2am on TV. For the 90 - 100 bucks you spend on the "spacer", save it and go for a 75mm Throttle Body. The labor to install it is almost identical, and the results unmistakeable. A good exhaust will help you get the full potential out of it, along with the FIPK I see you have already. Good Luck!
Senior User
Joined: Feb 2003
Posts: 369
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From: Bronx, New York
throttle body
When I installed my exhaust, I looked at Gibson, Borla, and Flowmaster. After a little research, I found the Flowmaster to be the right mix of performance and value. If I had the extra $$$, I would have gotten the Borla, but I am 110% happy with the Flowmaster Force II.........
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From: San Diego
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Logistics Pro
Joined: Oct 2000
Posts: 3,960
Likes: 5
From: All over Texas
throttle body
FYI, here's a response to a similar question by a guy on an engine forum who probably knows as much or more about 4.6L and 5.4L engines than anybody. Take it for what it's worth, I just don't want anybody to be disappointed.
"Well if you just bolt the LARGER 75MM BBK TB on, you will see little if no effects. The problems is that the stock hole in the TB ELBOW is only about 68-70mm in diameter. The BBK TB is 75MM in diameter. Thus leaving a 2.5mm disturbance in the incoming airflow. This resistance can actually make you lose power vs. your stock TB. What you need to do is to port/polish your TB ELBOW to match your BBK 75MM TB."
"Well if you just bolt the LARGER 75MM BBK TB on, you will see little if no effects. The problems is that the stock hole in the TB ELBOW is only about 68-70mm in diameter. The BBK TB is 75MM in diameter. Thus leaving a 2.5mm disturbance in the incoming airflow. This resistance can actually make you lose power vs. your stock TB. What you need to do is to port/polish your TB ELBOW to match your BBK 75MM TB."
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Junior User
Joined: Apr 2003
Posts: 98
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From: Redondo Beach
throttle body
That appears to be the case for me. I just finished installing my 75mm TB and I drove around the neighborhood. I have to tell ya, I didn't notice a whole lota difference. Maybe after the ECU adjusts itself I'll notice sometrhing...
Now about porting the TB elbow, how would one do that and what tools are required? It seems like I'm spending more on tools than on the actual Mods...
Now about porting the TB elbow, how would one do that and what tools are required? It seems like I'm spending more on tools than on the actual Mods...
Senior User
Joined: Feb 2003
Posts: 369
Likes: 0
From: Bronx, New York
throttle body
Forget the mod, you can get a 3"cold air style intake on ebay for $65 bucks. It's a 3" diameter (75mm) from filter to the TB. It may not be a K&N fipk, but you'll save like $150. The K&N is not much more than their logo on pretty much the same thing. Trust me, I've had both types.............
Logistics Pro
Joined: Oct 2000
Posts: 3,960
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From: All over Texas
throttle body
Originally posted by golakers
That appears to be the case for me. I just finished installing my 75mm TB and I drove around the neighborhood. I have to tell ya, I didn't notice a whole lota difference. Maybe after the ECU adjusts itself I'll notice sometrhing...
Now about porting the TB elbow, how would one do that and what tools are required? It seems like I'm spending more on tools than on the actual Mods...
That appears to be the case for me. I just finished installing my 75mm TB and I drove around the neighborhood. I have to tell ya, I didn't notice a whole lota difference. Maybe after the ECU adjusts itself I'll notice sometrhing...
Now about porting the TB elbow, how would one do that and what tools are required? It seems like I'm spending more on tools than on the actual Mods...
The elbow is after the TB, not before. It is a very labor intensive process whereby you have to literally shave the metal out of the inside of the elbow.
Junior User
Joined: Apr 2003
Posts: 98
Likes: 0
From: Redondo Beach
throttle body
Yes, I know that the elbow is after the TB. After looking at Neals work, I know that porting is something that I will definitely not be doing. It's more complicated than a simple layman such as myself is able to do.
I was correct in guessing that my ECU would adjust to the 75mm TB. After driving approx 400-500 miles during my roadtrip and re-fueling, I noticed improved throttle response and more power. At one point I was able to climb hills and mountains easier than before. Passing slower cars also got easier... or maybe it was all in my head.
I was correct in guessing that my ECU would adjust to the 75mm TB. After driving approx 400-500 miles during my roadtrip and re-fueling, I noticed improved throttle response and more power. At one point I was able to climb hills and mountains easier than before. Passing slower cars also got easier... or maybe it was all in my head.
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