JTso

iTrader: (2)

I've just purchased a spare TSX TB and spoke with Kingsmotorsports about their big bore TB service. The turnaround time is 2 days (the time it takes to do the work). They will taper, enlarge and polish the TB, as well as replacing the correct size throttle plate. I was told the end result would be just like a factory job. However, they won't be able to set the TPS since it's DBW and no TPS on the TB. Therefore, the throttle angle will need to be verified, perhaps via a scantool for the proper degree of throttle plate opening when closed. I'm hoping the result is similar to my other big bore TB experience, and you can look forward for a dyno test result when available.

Here is a link to Kingsmotorsports.

omelette

what

dom

Dan Martin

Dan Martin

Let us know how it goes Johnny.

GIBSON6594

Someone please knock me out so I stop laughing

Tsx536

Sounds like an awesome project. Can't wait to see your results JTso!

BlackTSX

What kind of engine would benefit from this? Any engine or highly modded? And would this provided a good amoutn of HP gain?

hondata

A TL drive by wire throttle body is a bolt on. It is 64-65mm. The intake will need port matching and the idle bypass (a left over from the Accord with its standard throttle body) will need welding up.

Based on our K20 tuning, I do not expect much, if any, in the way of gains until the engine is flowing a lot more air. For that you will need a race header cams etc.

However I'll be interested in any dyno results.

JeffTSX

If money wasn't too big of an issue, would upgrading to ITBs better?

blumpkin

JTso

iTrader: (2)

I'm in the process of preparing the TB and sending it to Kingsmotorsports for the big bore service. Basically, I'm removing everything except the throttle plate and cam assembly. Here are some pictures of what's inside the throttle body.

Throttle body assembly


Bottom covers off - The left is for coolant. The right looks like a venting space for the drive motor.


Security screw - The drive cover uses T20 security screws with a pin in the center. It also has 6 clips to hold the cover.


Drive cover off - Note the two pin contacts on the bottom of the cover.


Throttle actuator control


Drive assembly - Note the dual springs setup. One to return the throttle pate to home (normal) position. One to return from a fully closed to home (normal) position.


Drive motor


Throttle plate adjustment points - One at 11 o'clock for fully closed adjustment. One at 5 o'clock for home (normal) position adjustment.


Normal throttle opening - Normal throttle position at rest. the top TB opening is ~ 62.5mm.


Trottle body bottom - The bottom opening is ~ 60.5mm.


Misc parts - Parts that I will have to reinstall when the TB comes back from the big bore service.

CCColtsicehockey

WOW so was it easy to get out and take apart or was it a pain.

Still Water

God love digial cameras.

I can't go into any exact numbers,etc. but when I was at Comptech and was looking at the TSX SC test bed car I could swear that the Ice box-to-TB looked to be at least half again the OEM size. I didn't ask what they had done to the TB. I'm not fluent in SuperChargereze to ask detailed (i.e. intelligent) questions. Thinking form follows function I would guess the TB or adapted TB assembly would have to be enlarged. How does the SC interface into the TB/Intake assembly and how does the OEM control sys feed into and/or control the SC -- Curious. Any thoughts????
-D

blumpkin

The KMS Big Bore Throttle Body service is the perfect addition for those who want more intake capacity when using big camshafts, radical headwork and more compression. A new throttle plate is installed and the throttle body bore is tapered, enlarged and polished to fit. Each throttle body is bead blasted for perfect appearance and the TPS sensor is reset for optimum performance.
- From King Motorsports



What mods do you have that would make u wanna get that done?

phil217

JTSO cant wait to see the dyno results...good luck with that

rmpage

Do you think a dealer would be willing to do this? Or could most well-equipped garages?

Where'd you find the TB? ebay?

Good luck with this, I'm intrigued.

JTso

iTrader: (2)

Currently, I have CAI, header, Hondata gasket, Hondata reflash. I'm looking for a little better throttle response and hope this mod will help, as it did with my other setup. It's also part of the plan to prep for FI setup. How much is this going to help? I don't think anyone knows as no one else has done it with this DBW setup. I'm not too concern as to how much gain it will provide. I'm more interested of how the engine responds to such mod. If nothing else, it's good for educational purposes.

JTso

iTrader: (2)

It was pretty easy to take apart.

I wouldn't go ask a dealer to do it, as they are generally not very "supportive" with this type of mod. I'll let you know how things turn out and what adjustments are necessary. I got the TB from some guys who bought those train-wrecked K24 engines.

Canyonball

Are you gonna' dyno before and after the install?

If anything, this mod will prove usefull when you do go FI...

JTso

iTrader: (2)

Yes, I have dyno results of the various mods. The most recent one was with the Hondata reflash.

sauceman

Do you have dynos of your previous big bore TB's?

JTso

iTrader: (2)

I didn't have dyno results in stages from my previous setup, as I was doing mostly street tuning with the Hondata. I have tried BBK big bore TB and GSR TB on my Civic running JRSC. The bottom opening of those two TBs were perfectly matched to the JRSC intake manifold. They both offered better throttle response over the stock TB, but not sure the amount of gain, or where the improvement was on the dyno curves. But I will have the dyno result for the TSX TB.

sauceman

Thanks for taking one for the team.

CCColtsicehockey

so have you gotten it back yet

JTso

iTrader: (2)

KIng Motorsports just shipped it out yesterday and I should have it by next week.

MyK24a

planning to do a dyno?

JTso

iTrader: (2)

That's part of the plan.

MyK24a

thats great, keep us posted!

JTso

iTrader: (2)

I just got the TB back from King Motorsports today! The top is enlarged about 4.25mm to 66.75mm, and the bottom about 3.25mm to 63.75mm. A larger throttle plate is installed and plate position adjusted. They really did a fine job on the TB and maximize the size!. The next thing I need to do is to port match the intake manifold opening with the TB before trying it out and taking it to the dyno.

Here are some pics for comparison.

Big bore: Note the taper bore.


Stock:


Big bore bottom: They put the coating back on just like stock.


Top comparison:


Bottom comparison:

Dan Martin

Looking good!

jmathew34

looks very nice! let us know how the port matching of the intake manifold goes!! let us know how much it costs too!!

drunkenbuda

WoW, that looks great. I can't wait to see how much HP you'll get from this.

vwong

Very nice.

Make sure you post the dyno results.

GIBSON6594

Looks good J, do you think the tapered opening will reduce intake temp at all due to the thinner wall abosorbing less heat?

CJams

Looks good Johnny! Will you have everything done for the meet on Saturday?

jlukja

That's an 11% increase in airflow.

JTso

iTrader: (2)

I'm not sure if the thinner wall will reduce intake temp. Perhaps the higher volume of air flowing through it might?

I'm hoping to have everything done by Friday, so I can take it to the dyno on Sat morning, then go to the meet in the afternoon.

dom

I can't wait to see the results.

Nice work JT.

jiggaman

does boring the throttle body reduce the durablity?