Drivetrain Cheap bolt on big throttle body
Its fitted and working! Unfortunately we have a curfew in the Netherlands, so I will test it over the weekend. Cleared adaptations and checked if the TB was working using the actuator test in INPA (and started the car in the garage) 
Intake side (inside diameter)
OEM JCW: 60mm
BMW 13541439580: 66mm
Difference: 6mm
Intake side (outside diameter)
OEM JCW: 68mm
BMW 13541439580: 74mm
Difference: 6mm
Outgoing side
OEM JCW: 60mm
BMW 13541439580: 65mm
Difference: 5mm
Finalized product. I used 3" silicone hose, 45 angle degree and a big 3" airfilter. I cut into the hose to directly plug in the ventilation on the rocker cover and the EVAP hose. Also I needed to hack into the lower part of the airbox to have enough clearance for the silicone hose.
Be aware, its not an entirely straight fit, but its no rocket science either.
-Drilled out the mounting holes on the TB (1mm bigger), as the bigger TB has a different spacing (minimal)
-Cut into the bracket which holds the TB onto the black plastic intake pipe (as the holes do not align)
-Used 2 extra washers per mounting bolt
-Optional: Bottom part of the airbox trimmed to allow for a 45 angle 3" silicone hose for a custom intake
-Optional: Cut 10mm hole for rocker cover ventilation
-Optional: Cut 8mm hole for EVAP ventilation
Intake side (inside diameter)
OEM JCW: 60mm
BMW 13541439580: 66mm
Difference: 6mm
Intake side (outside diameter)
OEM JCW: 68mm
BMW 13541439580: 74mm
Difference: 6mm
Outgoing side
OEM JCW: 60mm
BMW 13541439580: 65mm
Difference: 5mm
Finalized product. I used 3" silicone hose, 45 angle degree and a big 3" airfilter. I cut into the hose to directly plug in the ventilation on the rocker cover and the EVAP hose. Also I needed to hack into the lower part of the airbox to have enough clearance for the silicone hose.
Be aware, its not an entirely straight fit, but its no rocket science either.
-Drilled out the mounting holes on the TB (1mm bigger), as the bigger TB has a different spacing (minimal)
-Cut into the bracket which holds the TB onto the black plastic intake pipe (as the holes do not align)
-Used 2 extra washers per mounting bolt
-Optional: Bottom part of the airbox trimmed to allow for a 45 angle 3" silicone hose for a custom intake
-Optional: Cut 10mm hole for rocker cover ventilation
-Optional: Cut 8mm hole for EVAP ventilation
I am almost hooked up with my setup. I have a alta intake an there is no way in hell I can stretch it out to fit the new throttle body. Probably going to have to do the 3" intake setup you have... Are you worried about heat at all? I am wondering if the box reduces the heat of the intake temp by putting it in a box....
Direct bolt on and go !
2nd Gear
Joined: Jul 2018
Posts: 109
Likes: 5
I just did this using a 325 TB (same diameter, slightly more work for bolt spacing). The oversized aliexpress silicone intake I bought fit perfect. It's still on jack stand and throttle response seems a bit laggy but won't know until it's on the road this week
2nd Gear
Joined: Jul 2018
Posts: 109
Likes: 5
https://www.aliexpress.com/item/2255...3e90301c2BPU0J
China already makes one at a discount (note fatter end); some trimming to length required:
https://www.aliexpress.com/item/2255...3e90301c2BPU0J
https://www.aliexpress.com/item/2255...3e90301c2BPU0J
Thank you so much for this!!!
If you message sellers of these intakes, you can get lucky abs find people who manufacture them abd you can have one made EXACTLY to what ever sizes you need from 2in-2in to 5in-5in
2nd Gear
Joined: Jul 2018
Posts: 109
Likes: 5
I don't know why China's making intakes for the r53 w/a bigger TB diameter, but they are. Could be a copy of a custom order, could be overstock, could be error. The "sculptor Rodin" branding was a nice touch.
3rd Gear
Joined: Oct 2012
Posts: 179
Likes: 25
From: Finland, Europe, Earth
The one I linked only needs about 1/3" off the fat end and could use a diagonal cut at the intake box end to match the intake box stop (I didn't bother w/this cut). I recommend using the worm clamps as a straight guide to cut.
I don't know why China's making intakes for the r53 w/a bigger TB diameter, but they are. Could be a copy of a custom order, could be overstock, could be error. The "sculptor Rodin" branding was a nice touch.
I don't know why China's making intakes for the r53 w/a bigger TB diameter, but they are. Could be a copy of a custom order, could be overstock, could be error. The "sculptor Rodin" branding was a nice touch.
So you have installed this Chinese intake tube?
3rd Gear
Joined: Feb 2014
Posts: 180
Likes: 6
I replaced my throttle body with one off Amazon (it was quickest to arrive) almost exactly a year ago. I believe ECCP brand. Haven't driven the car more than 5000 miles since but would get a rare rough idle & CEL. Maybe 3-4x over the year, would clear the code and go on no issues. Went to actually drive the car and it died, CEL, EML and would not idle. Tried clearing codes but still getting, p1125, p0638 & p1229 and won't idle. Waiting on an OEM stock replacement but debating this upgrade, with TPE charge pipe and upgraded intake pipe and air filter....
Have you guys had any reliability issues with these $90 upgrade BMW TBs? Have any of you went with the factory part? Most of the stuff I've ordered from Asia has been garbage, whether it's a drive shaft, coil, whatever - it works but typically fails relatively quickly. I love toying but if I can't drive the car when needed, what's the point?
BTW, even after typing all that I'm still tempted to "upgrade" cooling hoses with these...
https://www.aliexpress.com/item/2255...403122795%21sh
Have you guys had any reliability issues with these $90 upgrade BMW TBs? Have any of you went with the factory part? Most of the stuff I've ordered from Asia has been garbage, whether it's a drive shaft, coil, whatever - it works but typically fails relatively quickly. I love toying but if I can't drive the car when needed, what's the point?
BTW, even after typing all that I'm still tempted to "upgrade" cooling hoses with these...
https://www.aliexpress.com/item/2255...403122795%21sh
3rd Gear
Joined: Oct 2012
Posts: 179
Likes: 25
From: Finland, Europe, Earth
I've had the P1125 and P0638 codes with three differenct TB's now. Two of them were OEM and one is the bigger BMW. So it's not necessarily the TB causing it... In my case it seems to be the TB connector in the car's wiring. Every time the codes popped up and the car went in to limp home mode, I could clear the codes and continue driving after popping the connector off and back on. I have now secured the connector on the TB (the bigger one) by making the TB side of it thicker with a layer of electrical tape. The connector is now on there pretty tight. No codes so far, but I have only done about 800km with this "fix", so let's see...
The link didn't work for me, but if it's silicone hoses you're thinking about, then don't. Coolant can seep through those. Not in such quantities that it would cause issues, but enough to let the smell through. Not necessarily a perfect fit either.
The link didn't work for me, but if it's silicone hoses you're thinking about, then don't. Coolant can seep through those. Not in such quantities that it would cause issues, but enough to let the smell through. Not necessarily a perfect fit either.
3rd Gear
Joined: Feb 2014
Posts: 180
Likes: 6
Good call. Now that I think about it, I vaguely recall the new TB connector not "clicking" in. Unfortunately I haven't had the time to play with the car. Thank you though.
Yes, that was a link to silicone cooling hose kit. Thank you for that as well, saved me a lot of headache.
Yes, that was a link to silicone cooling hose kit. Thank you for that as well, saved me a lot of headache.
3rd Gear
Joined: Oct 2012
Posts: 179
Likes: 25
From: Finland, Europe, Earth
My TB connector fix wasn't the final solution, I got P1125 and P0638 and limp home mode yesterday when driving on an old cobblestone covered square at a car meet. So it might be some other connection somewhere that is loose. But I got it cleared again by unclipping the TB connector and then putting it back...
3rd Gear
Joined: Feb 2014
Posts: 180
Likes: 6
Lucky you got it to idle! Had a few min to start the car last weekend, idled fine, cleared codes, restarted and ran fine for a few min... so strange. Will likely send back OEM TB and order up one of these bigger TBs to go with silicone intake tube and filter.
4th Gear
Joined: Nov 2021
Posts: 538
Likes: 126
I have been running this TB for years with no issue. You see all these posts talking about true 3" blah blah blah the black plastic intake pipe is your restriction and any low down issue is not the TB. That being said I have a 4.5 " ALum billet feed into the tvs and with the stock throttle I can only hit 8200 with this one its 9k all day but again I am leaps and bounds above what most are putting this on. Besides the Bomba I think I am the only one with mech rockers ruining it out to 9
3rd Gear
Joined: Feb 2014
Posts: 180
Likes: 6
Finally got around to installing this along with 3" intake tube and filter. I'd really like to tap off the vac line but have it plugged up for the time being. Kind of incredible that I was unable to find line or an appropriate brass nipple locally...
I didn't get the chance to drive the car much unfortunately but did drive it around maybe 5 miles. There is a definite change. I'm not sure good just yet though. It seems like it needs more time to adjust or settings need to be cleared. At idle no check engine lights, I got on it a bit and CEL and EML light stayed on but car seemed to run the same. Previously, EML would light would put it in limp mode. Scan shows P1498 and P0136, which is strange because both sensors have been replaced recently.
380cc injectors going in soon then tune. Debating installing the headers I've had also, need an appropriate cat to go with them... any recommendations are most welcome.
I didn't get the chance to drive the car much unfortunately but did drive it around maybe 5 miles. There is a definite change. I'm not sure good just yet though. It seems like it needs more time to adjust or settings need to be cleared. At idle no check engine lights, I got on it a bit and CEL and EML light stayed on but car seemed to run the same. Previously, EML would light would put it in limp mode. Scan shows P1498 and P0136, which is strange because both sensors have been replaced recently.
380cc injectors going in soon then tune. Debating installing the headers I've had also, need an appropriate cat to go with them... any recommendations are most welcome.
I do sell the enlarged throttlthrottlebodies with matching 3in intakes.. I also tap the throttlthrottlebody to accept stock vacuum line routing and I test every throttlthrottlebody befor I sell them.
3rd Gear
Joined: Oct 2012
Posts: 179
Likes: 25
From: Finland, Europe, Earth
3rd Gear
Joined: Feb 2014
Posts: 180
Likes: 6
It's not a vacuum line, it's the EVAP line coming from the purge valve. Might not be a good idea to plug it off. I left the line coming from the EVAP canister to vent to open air, and deleted the purge valve all together (and disabled the fault code with bytetronik so it doesn't trigger a CEL).
5th Gear
Joined: Oct 2004
Posts: 1,005
Likes: 156
From: Northern Jersey
I've tried to read most of this thread, but for a stock JCW/GP, would there be a benefit to this throttle body? Do you lose some sensitivity with your throttle right at tip in if you've got a larger throttle body?
4th Gear
Joined: Nov 2021
Posts: 538
Likes: 126
I started running out of avl air flow at the top end and just over 300 whp. I didnt loose anything because I have a stand alone and was able to correct any negatives via complex tuning methods the stock dme cant do. My cam is also insanely wild at 300/288 and 450 lift with mech rockers.
Thread Starter
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6th Gear - AX Champion
Joined: Mar 2007
Posts: 3,296
Likes: 297
From: Pittsboro NC
I run them on stock head/cam cars and had a increase in boost with no downside as shown in datalogs including the ones I posted on first page
All of mine run jcw tune on facelift ecu
All of mine run jcw tune on facelift ecu