PnP TB

[Kilroy]

Does anyone still have the write up for this mod? Are there any dynos to show the power gain from this?

[Beodude123]

I don't think it would really show any gains... It might be a little bit, since the air doesn't have a huge bump to go across, but it's mostly better throttle response.

I did it on my RS a while back, and it did help power. But I basically just got a dremel, and smoothed out the edges. I didn't do much with the throttle plate bar though, just cut the middle down a bit. It's pretty easy to do.

[JoshDank]

Does anyone still have the write up for this mod? Are there any dynos to show the power gain from this?

Don't remember there ever being a write-up. There is little to no power gain, but it does help with throttle response. Basically, what I did, was use the grinding tip on a Dremel. You want to remove the "step" and smooth it into a "horn" shape. Do not grind where the butterfly seats against the inside wall. You can also smooth it below the butterfly. Try not to remove too much material or you can open a hole where a screw goes into the side of the TB. After you grind everything, you can polish it to make it more smooth and work out any smaller bumps. Feel free to PM me if you have any questions.

Another option is to get in on 4U2QUIK's group buy. He is actually boring the TB's and replacing the butterfly with a larger one (58 mm). This actually increases the amount of air into the TB a lot more than a PnP job.

[Kilroy]

Don't remember there ever being a write-up. There is little to no power gain, but it does help with throttle response. Basically, what I did, was use the grinding tip on a Dremel. You want to remove the "step" and smooth it into a "horn" shape. Do not grind where the butterfly seats against the inside wall. You can also smooth it below the butterfly. Try not to remove too much material or you can open a hole where a screw goes into the side of the TB. After you grind everything, you can polish it to make it more smooth and work out any smaller bumps. Feel free to PM me if you have any questions.

Another option is to get in on 4U2QUIK's group buy. He is actually boring the TB's and replacing the butterfly with a larger one (58 mm). This actually increases the amount of air into the TB a lot more than a PnP job.

link to the group buy?

[JoshDank]

link to the group buy?

http://www.teamzx2.com/showthread.php?t=66

[Kilroy]

70 seems sort of expensive?

[JonsZX2SR]

If you want to improve airflow, don't bother with a ported TB using a stock throttle plate. Increasing the throttle plate size from 55 to 58 mm will increase airflow (at equal pressure drop) by about 20%. (I have a one of a kind TB with a horn shaped inlet and a 57.6 mm throttle plate. Airflow was increasedby 18-19%.

The larger TB won't help much on a stock engine, but if you want to raise the HP peak with cams and headwork, increasing airflow (at equivalent pressure drop or resistance) by +16.5% means the larger TB would resist airflow at 6700 rpm at the same level as the stock TB does at 5750 rpm (which happens to be peak HP.)

If you believe the 130 HP rating of the stock engine, a modified engine that flowed 16.5% better at high rpm would be expected to make at least 151 HP at 6700 rpm. With better timing and higher CR the actual number would be higher.

The trick is to build the engine at least as well as the larger TB.

[JoshDank]

70 seems sort of expensive?

Not really. The only non-stock TB's available are for the Focus and they run $200-$300 dollars new. Plus, they usually require some modification to fit. Quik is actually using precision equipment to bore the TB's and creating new butterflies for them as well. I don' think it's a bad price, personally.

[Kilroy]

Cool... i might be interested... It'd be cool if they were powder coated or something too.

[Beodude123]

So when would you need a new TB? They don't seem to add much pony power when you see dynos in magazines. Of course, they are all pretty close to stock, but still. Would a fairly stock engine (most of the bolt ons) really even benefit with a 58mm TB?

[JoshDank]

So when would you need a new TB? They don't seem to add much pony power when you see dynos in magazines. Of course, they are all pretty close to stock, but still. Would a fairly stock engine (most of the bolt ons) really even benefit with a 58mm TB?

I hope to dyno mine at work when I get my bored TB. I had a 58mm Gude TB on my car for a little while and it seemed to make a noticeable difference over my self-ported one. Hopefully I'll have some actual numbers to compare when I get my new one from 4U2QUIK.

[vega]

I really miss my Gude TB, and im very exited to get quicks tb, and for 70 dlls, very good price. !!!

[Kilroy]

maybe i'll get it then if everyone seems so confident in its abilities.

[Beodude123]

I wonder if the engine braking is improved with the size?

[mechtech]

I have no dyno proof.
But it has to be better power wise - less restriction. This is assuming the job was decent.
Throttle response should be about the same.
My butt dyno showed a bit better pull at high RPMs/full throttle with my rough TB job.

[Kilroy]

I have no dyno proof.
But it has to be better power wise - less restriction. This is assuming the job was decent.
Throttle response should be about the same.
My butt dyno showed a bit better pull at high RPMs/full throttle with my rough TB job.

did you put a bigger butterfly in too, Mech, or just the pnp?

[mechtech]

I just cleaned up the ridges and casting marks. I radiused the entry and did a little dressing of the shaft and plate.
But it's the stock parts.
I am not where I need a bigger throttle body.