Throttle Body Modification - Pics

[Myxalplyx]

I just installed a polished/smoothed out throttle body on my RAV4 today. It differs from the stock unit in that the inside diameter is smooth instead of slightly reducing to a smaller diameter. The stock throttle body has a 'step' that reduces the inside diameter slightly. I tried to take a picture but it is not the best. I figured that the 2GR-FE Camrys probably have the same throttle body as I do, hence my posting it here Here's a pic!


The stock throttle body is on the left while the smoothed out throttle body is on the right. That ring you see halfway inside the left throttle body is where the diameter reduces smaller. It's not smooth either but an abrupt transition, like a step. On the right, is the polished out unit that came in the mail today. You can see the ring inside but there is no transition. That's where the metal was smoothed out. It is just smooth allt he way through.

Here is the unit installed -->



You can see the different color rings inside but if you run your fingers in there, it is smooth. Before, it reduced down where those rings are.

I do not know what to expect or if the change is measurable. That's what dyno's and the track is for. I will not be dynoing this though but will take it to the track. I know that if my 60ft, 1/8th and/or my 1/4 mile time or trap speed improves that this may have contributed. Will see! Just wanted to share.

I searched a bit but didn't see much around this in this forum. Happy Modding!

[LE05]

i hope you didn't pay too much for that... whoever machined the throttle body didn't do a very good job. throttle plate is all nicked and the coating on the actuator is damaged as well. and i seriously doubt removing that little step did anything if at all. i bet you it decreased performance if anything. just my two cents!

[Pawel062]

if its a increase somewhere itll be worth it.

[SMR]

The round butterfly disk should have been removed by removing the two phillips head screws and then the spindle should have been machined down to smoothen it. In that way, the butterfly would not have been nicked or scratched.

I don't see what the purpose of this mod will do.

[Netforcer]

This is a real common mod in the older car community without electronic throttle. Like the exhaust, it's all in theory... but every bit helps... by the way, you should think about coating the butterfly valve and shaft... don't want that to corrode

[Myxalplyx]

Originally Posted by Netforcer

This is a real common mod in the older car community without electronic throttle. Like the exhaust, it's all in theory... but every bit helps... by the way, you should think about coating the butterfly valve and shaft... don't want that to corrode

Thanks for the advice bro. It's appreciated! Doing this mod to see if it works at all and if it does, if it is measurable. Plan on doing as many 'little' things as possible to have a cumulative affect on straight light performance. THEN...the nitrous or cams or anything else can be added later....maybe. So...yeah, doing this to see how affective it is. I never expect anything. Just make changes, observe results and report back.

Only doing this because I haven't read anything around bored out, polished or machined throttle bodies on our 2GR-FE. Figured I may as well check it out. I plan on going to the track this Friday. Hopefully it doesn't rain. Through multiple runs, I have not been able to touch the 13.8 range in the 1/4. 60ft times stabilized in the low 2.0's and trap speeds will not go over 98mph. Temps testing on the prior runs were anywhere between 38F and 60F. So I figure if any of the above numbers improve (or all of them), this may have contributed just a tiny bit. I did install a Sprintbooster this week but I sure as hell ain't telling anyone that improved anything.

[Myxalplyx]

BTW: Based on some of the suggestions above, I am considering sending the throttle body I had removed sent out for the job to be done 'properly'. One of the RAV4 guys at another site sent me a link to a site that seems to have reasonable prices. It's worth a try.

http://www.maxbore.com/index.html

They are on vacation now but I'll give them a shout when they get back. In the meantime, I'm playing with some other mods before getting back to this. Just wanted to throw out some options in case anyone in the Camry community is interested. Seems interesting enough!

Update: Based on some good info I have been reading online, I'm going to give it a try.

[catric69]

Originally Posted by Myxalplyx

BTW: Based on some of the suggestions above, I am considering sending the throttle body I had removed sent out for the job to be done 'properly'. One of the RAV4 guys at another site sent me a link to a site that seems to have reasonable prices. It's worth a try.

http://www.maxbore.com/index.html

They are on vacation now but I'll give them a shout when they get back. In the meantime, I'm playing with some other mods before getting back to this. Just wanted to throw out some options in case anyone in the Camry community is interested. Seems interesting enough!

Dang, they are a local shop.

[Myxalplyx]

Here are a few pictures I took of the stock throttle body. This is the unmodified throttle body that came stock on the 2010 RAV4 V6. The 'molested' throttle body is what I currently have installed now. This stock one pictured below is what was sent out to Maxbore to be bored out earlier.
This first picture is of the inlet to the throttle body.


The next picture is the discharge side of the throttle body. This is what connects to the intake manifold via 4 bolts.


Nothing to write home about, I know. This is just for documentation purposes. It'll also help with the visual comparison of before and after.
I tried to take measurements of the inside diameter as accurately as possible. This next picture is the measurement taken of the inside diameter of the inlet side of the throttle body.

Take note that this measures at 3 1/16" (3.0625"?) or 78mm. Friggin' inches! Maybe I should have measured in mm. I hope the inch fraction conversion is right. :oops:

Next is the measurement taken of the discharge port of the throttle body.

The inside diameter of the discharge side of the throttle body measures at 2.75" or 70mm.

I mentioned above about how the 'step was removed with the throttle body I purchased from 'someone' here. I did not realize that the step was that significant. I didn't even think that the diameter reduced that much. Perhaps I have measured wrong, I dunno. What you see is what you see though.

So, just for the hell of it, I figured I may as well weigh this thing. Maybe boring it out will removed enough metal from the inside that it would be measurable weight wise. I do not know how this information would be useful but you never know right? So I weighed the throttle body.

It is 2lbs 2.7oz or 34.7oz.

Packaged this baby up and sent it out.

Now to wait and see what it looks like when it gets back. As for hp/tq, I am not expecting anything either way. Just testing the waters and seeing/learning what works and what does not. This is all for now.

[2wickedtoyz]

this sounds great. i give you props for even trying. most peple want "bolt-on" parts. you should look into increasing the inlet diameter of your plenum also or have them upgrade your disc to a larger size.

i'm going to do this to my 1mz and hopefully get some results from it.

[Myxalplyx]

I received the bored out stock throttle body from Maxbore yesterday. Took a little over a week to return. Not bad at all. Here are a few pictures I took this morning that you can compare to the previous pictures I took.

Bored out stock throttle body inlet -->



Bored out stock throttle body outlet (Where it connects to the intake manifold)-->



Here is the measurement of the inlet diameter of the throttle body after it was bored out:

Looks like 3 3/16 but it's slightly past that and the ruler isn't perfect. Seems it was a little off center so I'll say 3 4/16" or about 82.55 mm. So as to not exaggerate, I'll round down and say 82mm. So it's about 4mm bigger than stock.


Here is the measurement of the outlet diameter of the throttle body after being bored out:

2 13/16" or 71.4mm (Rounding down to 71mm). About 1mm larger than previously.


As for weight, to see just how much metal was removed, here's a picture-->

The throttle body is now 2lbs 1oz. It previously weighed in at 2lbs 2.7oz. So it weighs 1.7oz less than before.


I will probably install it sometime later today. Won't be able to dyno for a while since the guys are booked for weeks. Would like to simply have a stock throttle body to dyno, then remove it and dyno this one. Problem is, the unit I have on the car now is 'slightly' modified as you can see from my first post in this thread. I may go to the track tonight. Again, I never expect anything but if something has changed significantly enough, it'll show there. That's all for now!

[Myxalplyx]

A couple more pics before I put the intake back together. This was really quick and easy since the coolant is bypassing the throttle body already. Just 4 bolts and unplug the sensor.














I did measure the inlet to the intake manifold before installing the throttle body. It measured 3" or 76mm. There is no boring out of the intake manifold because it appears to be plastic. No wonder it doesn't stay hot. The gasket that seals the throttle body still is ok and seals fine. Car started and idled ok.

[njerald]

Have you heard of calipers to measure???????

[gdanaher]

njerald,
Just keep in mind here that measuring the diameter of the body throat with a tape measure is an improvement over the old eyeball trick for some of these guys. There are people who try to rebuild an engine and match piston diameter to cylinder bore with a tape measure, too. Y'all need to go shopping at Harbor Freight and buy up some of their cheapie tools that don't work well, but beat nothing. Multimeters for $3, and digital calipers for about $9. All Chinese, all short lived items, but they beat the heck out of a tape measure for this sort of thing. Use that tape to build your next house, not on the engine, please.

[untitlejk]

So did you ever get the dyno numbers? I'm very interested in your results with the maxbore.