Throttle body research: VQ35DE vs VK56DE

SexyRob · 09-16-2009, 08:40 AM

I figured this would be most appreciated here since N/A is looking to maximize performance in every way possible. If this isn't the appropriate section, mods feel free to move.

I started my throttle body project this weekend and took some measurements and pictures. I hope this helps someone as it was surprising to me that our 3.5l v6 uses the same size* throttle body as the 5.6l v8

*the inlet, outlet, and throttle plate are the same size. there is however more meat on the 5.6l if someone were to bore it out. *

I haven't looked into how the signaling is different between the two, if at all... I noticed they each have 6 connections. I assume two are for the electric motor and 4 for the position sensors. While they are oriented differently they both seem to have the same functions and should output the same result except for the possibility that the sensors send different ohms out for a given position.

to adapt the VK56 throttle body to the VQ35 plenum, I was going to get an adapter machined, but easier, get a throttle body spacer and drill holes to match up to the VQ35 plenum.

Pictures:

Click on images for Hi-Res

VK56DE -Left VQ35DE -Right

VK56DE Outlet - ID

VQ35DE Outlet - ID

VQ35DE Diagonal

VK56DE Diagonal

VQ35DE Thickness - OD (This is not solid throughout)

VK56DE Thickness - OD (This is not solid throughout)

Both throttle plates

VK56DE throttle plate

VQ35DE throttle plate

VQ35DE Inlet - ID

VK56DE Inlet - ID

VQ35DE Plenum - ID

This is why you cant take off more than a couple MM from the VQ35DE throttle body

SexyRob · 09-16-2009, 08:44 AM

Polishing:

Throttle plate polished (to 1500 grit)

Smoothed out all internal casting marks and got rid of the edge, Polished to 600grit

R350nate · 09-16-2009, 11:30 AM

wow thats sick man well done.

Entaille · 09-16-2009, 11:35 AM

thanks for sharing, interested to hear what becomes of all this.. great detailed pics on any info anyone could want..

Nexx · 09-16-2009, 11:41 AM

in the end, probably nothing even a dyno could pick up but nicely done.

SexyRob · 09-16-2009, 11:58 AM

Quote:

Originally Posted by Nexx

in the end, probably nothing even a dyno could pick up but nicely done.

Probably not, but It was done as more of a complimentary mod. It will help when I finish port matching and polishing the upper and lower intakes and the runners. And later when I get my 3" intake going.

uglyduc · 09-16-2009, 12:05 PM

Just an observation, it looks as though the gear ratios for plate movement may be different as well.

Z1 Performance · 09-16-2009, 05:40 PM

Quote:

Originally Posted by uglyduc

Just an observation, it looks as though the gear ratios for plate movement may be different as well.

you're absolutely right

Z1 Performance · 09-16-2009, 05:41 PM

Quote:

Originally Posted by SexyRob

Probably not, but It was done as more of a complimentary mod. It will help when I finish port matching and polishing the upper and lower intakes and the runners. And later when I get my 3" intake going.

explain?

SexyRob · 09-16-2009, 06:11 PM

what part do you want me to explain?

also in regards to the gear ratios, yes they are probably different, just I noticed while the motor gear is smaller on the vk56de the middle wheel is larger. I'm not sure how much it would be off (I'm sure there is some math that can explain) and if the computer could compensate for it. I just got it cheap on ebay so I decided why not? If anything I can throw it back together and resell it for more than I paid.

ironx · 09-17-2009, 11:43 PM

sweet looks good what kind of paint did you use looks great

TheFarmer · 09-17-2009, 11:45 PM

Looks good.

allmotorsedan · 09-19-2009, 03:35 PM

Very nice! Do you know of any company that sucessfully ported the TB with no problems of the DBW (drive-by-wire)? I thought I seen Portflow had done it but not 100% sure.

Anyway, the VK56 has 315hp and 400tq, so it is pretty obvious that porting is not necessary to make power gains especially for NA VQ35de gurus...

INTIMAZY · 09-24-2009, 07:10 PM

Quote:

Originally Posted by allmotorsedan

Very nice! Do you know of any company that sucessfully ported the TB with no problems of the DBW (drive-by-wire)? I thought I seen Portflow had done it but not 100% sure.

Anyway, the VK56 has 315hp and 400tq, so it is pretty obvious that porting is not necessary to make power gains especially for NA VQ35de gurus...

Proflow was very conservative on their porting jobs. I currently have an old 350evo TB which from what I read, was done by Proflow. It runs well once ECU relearns. Gains? None that I noticed...

MouseTrap · 07-04-2010, 08:48 AM

So did this end up working out in the long run? Did the connectors just plug and play?

SexyRob · 07-04-2010, 02:55 PM

the vk56de throttle body is still sitting on my shelf. I never pursued boring it out or converting it because I haven't felt the need yet. It was proven by sash that the TB wasn't the limiting factor on our engines, at least on mild n/a builds.

MouseTrap · 07-05-2010, 06:27 AM

True that. I was just intrigued. Searching for random knowledge haha

Maddawg · 08-07-2010, 08:14 PM

what paint did he use, or was the body powdered coated??????????????????

please advise. I am at this point now

SexyRob · 08-10-2010, 10:40 AM

just used duplicolor and baked it...

I removed the throttlebody warmer and put in a iso thermal spacer so I don't have to worry about high temp paint.