Has anybody ported and polished there throttle body yet? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Jtymay92 · 06-18-2013, 02:15 PM

Going to be installing my fa20 CAI this weel and I am thinking about port and polishing my throttle while I have it all apart. Just wanna here ur thoughts.

Chimpo · 06-18-2013, 02:30 PM

I don't see the point. It's not exactly rough. Maybe you could try and get some sort of taper to it, but you're still going to have the factory throttle plate in there as a bottle neck. Past that, it's already a 3" throttle body, which isn't exactly small for a NA 2.0L engine.

The other thing is that I don't have a degree in fluid dynamics, so unless you do (or a flow bench to prove out what you did), you don't really know that what you're doing is helping ( I understand ports on a head vs intake manifold didn't match up, and/or it was a rough cast surface).

In the end you probably won't hurt anything, but I wouldn't expect anything either.

On a side note, Cusco offers an overbored one, and I think there are more options out there as well.

CaptainSlow · 06-18-2013, 02:37 PM

*their

Jtymay92 · 06-18-2013, 02:40 PM

Quote:

Originally Posted by Chimpo

I don't see the point. It's not exactly rough. Maybe you could try and get some sort of taper to it, but you're still going to have the factory throttle plate in there as a bottle neck. Past that, it's already a 3" throttle body, which isn't exactly small for a NA 2.0L engine.

The other thing is that I don't have a degree in fluid dynamics, so unless you do (or a flow bench to prove out what you did), you don't really know that what you're doing is helping ( I understand ports on a head vs intake manifold didn't match up, and/or it was a rough cast surface).

In the end you probably won't hurt anything, but I wouldn't expect anything either.

On a side note, Cusco offers an overbored one, and I think there are more options out there as well.

I was just wondering if anybody has done it yet or it would even make a difference. I did it to my truck and it made a big deference in throttle response. But if it isn't going to make a difference am not gonna bother with it. I really just wanted to see if ppl have done it on this car yet.

supramkivtt2jz · 06-18-2013, 02:42 PM

im more concerned what the intake ports look like. im sure gasket matching them would net something.

DJCarbine · 06-18-2013, 02:55 PM

I've had some bad experiences with porting throttlebodies on OBDII engines.
Depending on the porting job, you may get DTC codes due to discrepancies between throttle position and actual airflow measured by the MAF.

I was chasing several DTC codes in a previous car that turned out to be due to a ported OEM throttle body. Was confirmed not to be a sensor/electronics issue, just a difference in airflow that the ECU said "nope" to and threw several DTC codes.

The throttle response was better with the ported throttle body, but after switching to the OEM unit I got used to it after several drives and it actually felt better and less "twitchy"

Trashed675 · 06-18-2013, 03:39 PM

If you plan on really building the engine then go for it, but if its an NA street car(intake/exhaust) its not worth it. I put a larger bore TB on my Ford Probe GT back in high school and it made absolutely zero difference on the butt dyno...that was $400 well spent

NYCsubaruBRZ · 07-13-2013, 07:00 AM

i want to see this happen. i cant believe that no one has done this yet!

i did it on my 1998 4.0 sohc v6 explorer sport.
IT IS NIGHT AND DAY WHEN YOU SWAP THE STOCK TB FOR THE P&P TB... (on the 4.0 sohc v6) even tho its a totally different engine.
i might get another stock brz tb to have p&p. i will try to find a used one maybe from a totaled one. if i can find one.

this car has no balls. we need to start modding

does anyone know how much a new throttle body is?

mad_sb · 07-13-2013, 08:42 AM

Quote:

Originally Posted by Trashed675

If you plan on really building the engine then go for it, but if its an NA street car(intake/exhaust) its not worth it. I put a larger bore TB on my Ford Probe GT back in high school and it made absolutely zero difference on the butt dyno...that was $400 well spent

Quote:

Originally Posted by NYCsubaruBRZ

i want to see this happen. i cant believe that no one has done this yet!

i did it on my 1998 4.0 sohc v6 explorer sport.
IT IS NIGHT AND DAY WHEN YOU SWAP THE STOCK TB FOR THE P&P TB... (on the 4.0 sohc v6) even tho its a totally different engine.
i might get another stock brz tb to have p&p. i will try to find a used one maybe from a totaled one. if i can find one.

this car has no balls. we need to start modding

does anyone know how much a new throttle body is?

The gain are going to depend on how big of a restriction the OEM throttle body is. On that Probe GT it probably wan't a restriction at all but on 4.0 V6 it probably was.

As DJcarbine mentioned, the ecu might get pissy, especially given the drive by wire system. Then again, it might be perfectly happy.

However, given the way the drive by wire works (torque request vs calculated torque) you would probably only notice any gains at WOT. No that that is a bad thing.

roddy · 07-13-2013, 09:09 AM

Quote:

Originally Posted by NYCsubaruBRZ

i want to see this happen. i cant believe that no one has done this yet!

i did it on my 1998 4.0 sohc v6 explorer sport.
IT IS NIGHT AND DAY WHEN YOU SWAP THE STOCK TB FOR THE P&P TB... (on the 4.0 sohc v6) even tho its a totally different engine.
i might get another stock brz tb to have p&p. i will try to find a used one maybe from a totaled one. if i can find one.

this car has no balls. we need to start modding

does anyone know how much a new throttle body is?

I also have a 4.0 SOHC V6 (supercharged), but it's in an '07 Mustang. Reading your post got me thinking about these guys... http://www.zabteck.com/moretb.htm They specialize in the 4.0, but can do any throttle body you care to send them. I have seen a lot of people use them for TB mods, and heard nothing but praise for their work. If anyone is interested, contact Todd Z. Good people.

troek · 07-13-2013, 10:26 AM

the cusco bored tb barely shows gains. i think it is the lowest hp per cost mods ive seen.

roddy · 07-13-2013, 12:49 PM

The price of the Cusco TB is crazy.
For less than 1/5 the cost of that, a person could have their stock TB (or a core from a wrecked car, etc) ported/bored, polished, 1/2 shafted, and knife edged. I'm surprised I haven't seen more discussion on this especially in the F.I. threads.

jamesm · 07-13-2013, 01:13 PM

There's absolutely no need for it. The TB on this car is huge already. Very, very low hp/$ mod.

zooki · 07-13-2013, 04:58 PM

If you get this done, don't forget to pick up one of these:
http://kalecoauto.com/index.php?main...&products_id=8
I'd say it was almost mandatory....

06-18-2013, 02:15 PM	#1
Jtymay92 Member Join Date: Jul 2012 Drives: 2013 Raven Scion FRS Location: Victoria TX Posts: 77 Thanks: 26 Thanked 12 Times in 7 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Has anybody ported and polished there throttle body yet? Going to be installing my fa20 CAI this weel and I am thinking about port and polishing my throttle while I have it all apart. Just wanna here ur thoughts.

06-18-2013, 02:37 PM	#3
CaptainSlow Senior Member Join Date: Oct 2012 Drives: 2013 Scion FR-S Location: Mid-Michigan Posts: 799 Thanks: 392 Thanked 388 Times in 180 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	their __________________ Ultramarine 2013 Scion FR-S 6MT*

06-18-2013, 02:55 PM	#6
DJCarbine Thupercharged Join Date: Mar 2013 Drives: 2013 FR-S Location: La Grange Park, IL. Posts: 1,501 Thanks: 116 Thanked 751 Times in 439 Posts Mentioned: 23 Post(s) Tagged: 0 Thread(s)	I've had some bad experiences with porting throttlebodies on OBDII engines. Depending on the porting job, you may get DTC codes due to discrepancies between throttle position and actual airflow measured by the MAF. I was chasing several DTC codes in a previous car that turned out to be due to a ported OEM throttle body. Was confirmed not to be a sensor/electronics issue, just a difference in airflow that the ECU said "nope" to and threw several DTC codes. The throttle response was better with the ported throttle body, but after switching to the OEM unit I got used to it after several drives and it actually felt better and less "twitchy" __________________ 2013 FRS Vortech V3 11psi Revworks UEL - PLM Overpipe - MOTIV catted frontpipe - Invidia Q300 2019 Series.Grey STI - Stage1+ SF

07-13-2013, 12:49 PM	#12
roddy Senior Member Join Date: Apr 2012 Drives: '13 Ultramarine Location: Ontario Canada Posts: 2,243 Thanks: 1,476 Thanked 1,165 Times in 685 Posts Mentioned: 15 Post(s) Tagged: 0 Thread(s)	The price of the Cusco TB is crazy. For less than 1/5 the cost of that, a person could have their stock TB (or a core from a wrecked car, etc) ported/bored, polished, 1/2 shafted, and knife edged. I'm surprised I haven't seen more discussion on this especially in the F.I. threads. __________________ no man with a good car needs to be justified...

07-13-2013, 04:58 PM	#14
zooki Senior Member Join Date: Jun 2012 Drives: waiting on a 2021... Location: Texas Posts: 770 Thanks: 190 Thanked 410 Times in 233 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	If you get this done, don't forget to pick up one of these: http://kalecoauto.com/index.php?main...&products_id=8 I'd say it was almost mandatory.... __________________ 2016 4Runner Tail edition 2020 Camry 2020 RAV4 2013 Chevy 3500 4x4 Duramax 1999 Ford F250 Powerstroke, the tow rig 1969 Mustang, the fast car....(:

06-18-2013, 02:30 PM	#2
Chimpo Senior Member Join Date: Sep 2012 Drives: '15 STi Ltd Location: Probably a location near you! Posts: 297 Thanks: 37 Thanked 149 Times in 61 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I don't see the point. It's not exactly rough. Maybe you could try and get some sort of taper to it, but you're still going to have the factory throttle plate in there as a bottle neck. Past that, it's already a 3" throttle body, which isn't exactly small for a NA 2.0L engine. The other thing is that I don't have a degree in fluid dynamics, so unless you do (or a flow bench to prove out what you did), you don't really know that what you're doing is helping ( I understand ports on a head vs intake manifold didn't match up, and/or it was a rough cast surface). In the end you probably won't hurt anything, but I wouldn't expect anything either. On a side note, Cusco offers an overbored one, and I think there are more options out there as well.

07-13-2013, 07:00 AM	#8
NYCsubaruBRZ Banned Join Date: Sep 2012 Drives: 2013 Subaru BRZ & 99' Ford Explorer Location: NYC Posts: 709 Thanks: 94 Thanked 87 Times in 66 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	i want to see this happen. i cant believe that no one has done this yet! i did it on my 1998 4.0 sohc v6 explorer sport. IT IS NIGHT AND DAY WHEN YOU SWAP THE STOCK TB FOR THE P&P TB... (on the 4.0 sohc v6) even tho its a totally different engine. i might get another stock brz tb to have p&p. i will try to find a used one maybe from a totaled one. if i can find one. this car has no balls. we need to start modding does anyone know how much a new throttle body is?

07-13-2013, 01:13 PM	#13
jamesm Banned Join Date: Mar 2013 Drives: 2013 FR-S Location: Orlando, FL Posts: 2,929 Thanks: 1,166 Thanked 2,293 Times in 1,180 Posts Mentioned: 313 Post(s) Tagged: 4 Thread(s)	There's absolutely no need for it. The TB on this car is huge already. Very, very low hp/$ mod.

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