I got my King Motorsports modified throttle body back and it looks good. I haven't installed it yet as I have been a little busy. Also, I never got a chance to take highly accurate measurements as I had to head to the hospital (that will be in a separate thread). But the numbers I did take are close enough to tell; within 0.5 mm.

The stock TB numbers are as follows:

68mm Inlet
65mm Outlet

The modified numbers:

71mm Inlet
69mm Outlet

This is more than I expected in the end so I am quite pleased with the $150 price. I'll put it on later today and reply with the results. Below are a couple of pictures of the modified TB:

 

great steve let me know what happens.its good to see your back

 

Looks good Steve.

 

is it the same throttle body on 01 CLS-5AT? is it a new one replacing your TB?

 

It is the stock one and the same as the automatic CL-S. All King Motorsports did was enlarge it by boring it out and adding a new throttle plate.

 

That is good keep us posted on your review... I understand you have to take out the TB and send it and wait till it is back... while the CLS is down.

 

i've followed with interest your recient 8/01 post and subsequent thread regarding the t/b and its charactoristics/ limitations in a boosted application. the additional work you and others are performing on the internal induction components and the like. i, like nashwa n/h, own an 01 a/t model, and greatly appreciated the dedication of the many on this forum who strive to improve their cars and are willing to share the info with others.
thanx,frank pletcher

 

I have a stock 03 TB sitting on a shelf. King Motorsports did the work. Was it a one time thing, or can anyone send in theirs for the same work?

 

$$$150...... turn around time?

Smitty

 

Sweet! That is excellent result on the bore... If I didn't drive my car daily, I send my in..

fuzzy, you can do it too!

 

Yes, King Motorsports did the work and the service is available to anyone. Just ship it to them with payment and return instruction. Their turn around time is about three days.

 

Three days from reciept of the unit.

 

I knew I didn't need the car for a week so I went ahead and did it.

 

I couldn't have said it better, thanks!

 

I just took it for a drive and it feels great. I can't say that there is more power; it wouldn't be felt anyway as it would only be about a 3% - 5% gain. But it continued, maybe more so, to shred the tires through first, spin through 2nd and break loose going into third.

The nice thing is that I know it does hurt so to me it is $150 well spent.

 

 

So you're looking at 6-10 HP on a stock TLS. IMO a nice gain for $150-170 (incl. p/h) and about a week without your car.

 

I wouldn't say that for sure. It doesn't appear to be a limiting factor on an NA J32A2 engine. But it might provide some gains which would need to be tested.

 

Can some with NA type borrow your new bored TB and dyno it on his car? thanks.

 

Only if they are in the Atlanta area and can go the same day I go to the dyno...

 

steve sounds good.question i f iput the new throttle body on and my stock intake maniflod isnt ported will it cause turbulence and will i see the gains you did considering my intake is not ported.

 

It has nothing to do with the manifold being ported. It is that the TB is the most restrictive flow point in the system. So yes, if gains are to be had then you would see them regardless of the manifold.

 

Steve. On the stock intake manifold, the inlet to the manifold is sized to the stock TB. When you mount a larger TB, you can actually see the inlet of the manifold inside the TB (its several mm smaller) - I don't see how the TB will help without re-sizing the manifold inlet port.

I don't know about the S/C kit as you mount the TB elsewhere.

 

The TB mounts to the SC inlet which was already larger to begin with. In fact, it was slightly larger than the gasket. I checked this before reinstalling and would place it at about 71 - 72mm.

Below is a image of the TB attached to the SC inlet:



But even if the diameter were the same you still have more area for flow since the throttle plate and shaft are not in the way.

 

True... I don't think most folks know that the 'intake manifold' inlet is smaller than the TB... actually even though its periphory is the same size as the gasket, the inside is actually smaller!

 

So the SC inlets are larger than the tappered TB? Then without having to port the SC intake, this seems like a wonderfully inexpensive mod and provides (insticntively) for some gains through improved ease of airflow. Is there any charge for a core change ext?

 

You are correct.

I didn't exchange mine, I sent it in, they ported it and sent it back within a week. They have no core units right now so it is done to your stock TB.

It might be worthwhile for someone here to set up an exchange program to where multiple people chip in to buy a stock unit, use it to be ported, take the old stock unit and send it in for someone else, etc.

 

Nice mod . . . too bad you didn't have the time to have your intake extrude honed . . . that with the TB mod would provide more noticeable gains . .

Although extrude honed is a bit expensive . . . and the turnaround time is longer . . .

Ruf

 

good idea

 

I hand ported and polished the upper intake manifold and injector base late last summer...

Part 1:
http://www.acura-cl.com/forums/showt...threadid=81192

Part 2:
http://www.acura-cl.com/forums/showt...threadid=81430

Part 3:
http://www.acura-cl.com/forums/showt...threadid=81626

 

Thanks for the links and great job on all parts. A true "Hot Rodder" :butthead"

By the way, on one of the threads I noticed you mentioned that doing it by hand vs a complete extrude honed process were basically the same.

Well, while they both clean up the rough surfaces, extrude honed is more complex. Not only does extrude honed can reach places you can't reach it does one key modification that you can't duplicate by hand. An extrude honed process actually maps airflow through the intake and determines where the "high resistence" spots are and removes them thus improving the overall velocity of the airflow. This key point can account for a larger percentage increase than a basic porting job. Something like 25-30% airflow improvements.

Extrude honed can be done to lots of different parts. However, it's not cheap, but if you got the bucks and the time, it can really get some untapped hp for you.

For more on this visit:
http://www.extrudehone.com/oem.html

Ruf

 

Well yes and no. While information provided is correct about extrude honing, there is counter information showing that this is not always desirable. In some case extrude honing removes material that should be left in place.

In this case, all areas were accessible with my air grinder negating that potential argument. Also, flow of a semi-solid/liquid is different than a gas which is why it is not perfect and has some deficiencies.

If done carefully hand porting can provide similar gains to flow; but it takes quite a bit of time to get right.

 

Thats alot of $$$ .








Juker008

 

Hey Steve,

Do you think the throttle body upgrade would be worth the $150 investment for a TL-s with Headers and Icebox (still backordered).

If so, when I take a few vacation days back to Atlanta, I will send it off to King Motorsports.


Thanks

D

 

Yes ,what were your gains?

Ruf

 

does the s/c still fit properly??

 

are you going to get it dyno'd?

 

I honestly can't say for sure if there would be noticeable gains. But if the car can be down for a week, to me the cost is very reasonable.

There is no question about this not hurting and everything suggests that it should provide gains; how much is the question. But the cost is minimal especially relative to everything else we do and add and I would expect the HP/$ ratio to be as good if not better than many other mods we can do.

 

But I knew it wasn't going to help especially after do the flow rate calculations on the stock TB; this could do nothing but help a little.

 

:sqnteek:

The inside of the TB was enlarged which wouldn't impact the outside. So yes, it does fit just like before.