Ported stock throttle body

I did not have time based on my scheduled appointment time, plus I had another test planned that didn't quite work out. I did not want to hold the shop up anymore. Yes, testing my car same day pre and post throttle body install would have been the best test but worked with what was available at the time.

First off I would like to say thanks to the other member for his time and effort put forth to try to document
any possible measurable performance gains from this newly-available item. I do believe most will agree -
even as this person himself has said- that the dyno protocol utilized was less than ideal.
As noted in my prior posts (#15,17) I will be doing a dyno comparison on this ported TB in the manner
suggested by Pencil Geek . Will be reporting back to all my results.

It takes five minutes to swap throttle bodies. Easily done during a dyno session.

Get a chance to dyno yet?
:ford:

Red Beast said:

First off I would like to say thanks to the other member for his time and effort put forth to try to document
any possible measurable performance gains from this newly-available item. I do believe most will agree -
even as this person himself has said- that the dyno protocol utilized was less than ideal.
As noted in my prior posts (#15,17) I will be doing a dyno comparison on this ported TB in the manner
suggested by Pencil Geek . Will be reporting back to all my results.

Click to expand...

Unfortunately no, my past 2 days off work I've been too busy to get back to do further dyno work.:frusty: I am anxious to do this but just hasn't been possible yet. Hopefully less than 3 wks. out .

Did you need an updated tune with the ported throttle body?

I ported mine a couple of weeks ago, and honestly, you're not going to notice anything. It's just one of those little things that might help airflow a touch here or there, but it's not something you can feel.

MAV said:

I ported mine a couple of weeks ago, and honestly, you're not going to notice anything. It's just one of those little things that might help airflow a touch here or there, but it's not something you can feel.

Click to expand...

By chance did you measure how far out you ported it to from the stock 87mm?

No, but it's still 87mm because that's the diameter of the butterfly valve. "Porting" in this case only means smoothing the rough edges left over from casting and machining to smooth the airflow into the TB. You have to be careful not to get into the actual machined area where the valve seats.

MAV said:

No, but it's still 87mm because that's the diameter of the butterfly valve. "Porting" in this case only means smoothing the rough edges left over from casting and machining to smooth the airflow into the TB. You have to be careful not to get into the actual machined area where the valve seats.

Click to expand...

Yeah sounds more like a throttle body spacer effect more than anything.

You really need to verify the impact of any work to the TB on a flowbench. My experience with porting cylinder heads for big inch top fuel engines tells me there is nothing to be gained unless you can open up the inside diameter. Sharp edges or transitions can impact the flow, generally smoothing rough surfaces on a large cross section area, such as this throttle body, will not show any significant change in flow. How this translates into any type of power gain is probably a mute point when there are so many conditions downstream that control the amount of air moving through this engine.

I was looking to bore out a stock GT350 throttle body but I read this and it has given me pause:

"In regards to the throttle body redesign, Kershaw mentions, “Maintaining idle and emissions is critical and far easier with the round throttle body. The GT350 was able to hit its performance targets with a slightly larger 87 mm over the GT’s 80 mm. The GT350 manifold has proven so good that we tried to make a slightly modified Cobra Jet manifold that would package under the S550 hoodline but it wasn’t any better than the stock GT350 with the stock, round throttle body. With a cowl hood or lowered engine, the Cobra Jet manifold is worth some power but few customers are interested in going down that path. We developed a 92 mm but the gain was so minimal that we have shelved it for now. Plus, it would be off-road only and currently we don’t see the level of aftermarket support to make it worthwhile.”"

link where quote is found:
http://www.fordmuscle.com/tech-stor...old-shootout-gt-gt350-boss-302-and-cobra-jet/

I think I am reading it right that a 92mm TB on the Voodoo didn't do all that much. So is the stock exhaust limiting flow?

ldp82 said:

I think I am reading it right that a 92mm TB on the Voodoo didn't do all that much. So is the stock exhaust limiting flow?

Click to expand...

This was discussed in a different thread. We're thinking the biggest bottleneck is actually the cams. Need more duration.