WJ 4.7v8 Throttle Body Spacer

_R700_ · Jan 14, 2013

Hi guys,

Is the throttle body spacer worth it on a 4.7v8 WJ? Can you notice it in your seat-of-the-pants dyno? Does it improve fuel economy at all?

It made a little improvement on my prev XJ 4.0L and the spacer was cheap so I didn't mind giving it a go. The spacer for the WJ is a bit more $$ (esp to get it to me in Aust as well) so was wondering I'd ask before buying.

Thanks

Jeep Boy · May 12, 2013

I've never heard a lot of good things from those spacers. For some engines (like the I6 4.0) I think it helps a little bit but it's not worth the cost.
But if you are looking for something bolt-on that will help open the 4.7 up a bit go to this website:

http://www.thefastman.com/throttlebodies47.php

It's a polished and bored out 4.7L throttle body that helps the engine breath better. May be more expensive then you'd like but I know that will definitely add some punch!

_R700_ · May 12, 2013

Jeep Boy said:
I've never heard a lot of good things from those spacers. For some engines (like the I6 4.0) I think it helps a little bit but it's not worth the cost.
But if you are looking for something bolt-on that will help open the 4.7 up a bit go to this website:

http://www.thefastman.com/throttlebodies47.php

It's a polished and bored out 4.7L throttle body that helps the engine breath a lot better. May be more expensive then you'd like but I know that will definitely add some punch!

Thanks Jeep boy, I'll check it out.

Interesting to see that the 4.7's had diff throttle body sizes from 2000-2003, I never knew that..!

kfxnando · Jun 2, 2013

have only read that throttle body spacers on the 4.7 are a waste of money!!

however there is something that can make a nice difference!!

https://picasaweb.google.com/117986...m/117986774702287688534/JeepHeadersBranchesAndNOCats?authuser=0&feat=directlink

hope this helps

rppearcy · Dec 16, 2013

Jeep Boy said:
I've never heard a lot of good things from those spacers. For some engines (like the I6 4.0) I think it helps a little bit but it's not worth the cost.
But if you are looking for something bolt-on that will help open the 4.7 up a bit go to this website:

http://www.thefastman.com/throttlebodies47.php

It's a polished and bored out 4.7L throttle body that helps the engine breath a lot better. May be more expensive then you'd like but I know that will definitely add some punch!

Read your comment about "fast man throttle bodies". Am interested but noticed you didn't mention having that item on your car???
Thanks, Richard

Jeep Boy · Dec 18, 2013

rppearcy said:
Read your comment about "fast man throttle bodies". Am interested but noticed you didn't mention having that item on your car???
Thanks, Richard

I have not tried it on mine yet but I will be soon, maybe in the next couple weeks. I get my knowledge from articles I've read of folks who have tried it themselves and got good results. I'll be sure to post the results of me actually installing it.

rppearcy · Dec 18, 2013

Jeep Boy said:
I have not tried it on mine yet but I will be soon, maybe in the next couple weeks. I get my knowledge from articles I've read of folks who have tried it themselves and got good results. I'll be sure to post the results of me actually installing it.

Thanks, will be watching for it. I'll be working on my WJ again late Jan.

rppearcy · Dec 18, 2013

Thanks, I'll be watching for it. I'll be working on my WJ again probably late Jan. R

hawkWJ2000 · Jan 18, 2014

Judging by that Throttle bodies page just get a TB from a 2001+ 4.7 and you'll get all the benefit that his will give you.

Jeep Boy · Jan 22, 2014

hawkWJ2000 said:
Judging by that Throttle bodies page just get a TB from a 2001+ 4.7 and you'll get all the benefit that his will give you.

Agreed!

If you install a stock 2001 TB then you will get the same intake efficiency as a as a 2000 TB from Fastman.
You can get a larger bore by installing one of his 2001 TBs that have been bored to 71mm. However he doesn't recommend it as it showed minimal gains.

So if you have a 2000 4.7L then just install a 2001 throttle body
If you have a 2001+ 4.7 then the throttle body is already the optimal bore

WJ 4.7v8 Throttle Body Spacer

_R700_

Jeep Boy

_R700_

kfxnando

rppearcy

Jeep Boy

rppearcy

rppearcy

hawkWJ2000

Jeep Boy

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