62 mm TB's

[tejohnson]

Originally Posted by AMRAAM4

Only time it is not useless is when you have A LOT of engine work. Other than that, please feel free to send AMRAAM your $200+ dollars.

P.S. My father's line at work makes the GM TB's

I'm not sure how much a lot is? I have done a considerable amount to the entire top end (P&P), and a new exaust from the headers to the tails. I think some NA folks have proven to me how the additional flow has certainly helped. That pretty cool about your father, perhaps you can have him post some details about what modifications would really make a difference! Or if there are any interchangability options to increase intake flow by using a MAF from an LA1 for example! I would absolutely love to know more detail (This is a sincere request).

[Schweppe23]

Well, i do agree with Bob for the most part. Unless you have increased every other limiting factor of the motors intake side the tb will be the smallest increasing mod (efficiency). you can go with a tb that is too big resulting in no net gain and perhaps hurting the total performance of your engines output. in my case the tb/sc/maf is the biggest restriction on the intake side of my setup not to mention the piping of my intake. Many of my sc counterparts will coincide <sp> that a larger tb resulted in an additional # of boost and slightly lower iats. From the #s that i've been playing with a 66mm tb would be ideal and that will most likely be the size of my next tb. Then the maf and s/c. Does anyone know the max hz (maf) as well as flow #s on our tb, i got the flow#s on my modded maf and i'll post 'em as soon as i find them, but i'm curious as to what they are stock? Stay Tuned!

[phantom505]

Originally Posted by AMRAAM4

FOXNEWS ALERT!

buying a larger throttle body, for the most part, is useless!

Except that you will improve throttle response, especially at the bottom end. And if you have forced induction. Or if you have **** load of other mods like UIM.

Oh, and if going to 65mm isn't going to do much then why the hell did GM go with a 65mm TB on the 3500?

Glad to see you're back!! It's been too quiet.

[dongalonga]

I just emailed domestic performance concerning their throttle bodies. does anyone have any new updates about their 62mm tb because i just spoke with RSM and now they are telling me it will be 3 more weeks before i see my tb i ordered two weeks ago. this is really starting to become agravating considering the Doc never sent me a tb and now RSM is going to take over a month. my car is running like crap and i need a tb bad!!

[phantom505]

I'm not sure what the latest word is, but this is what I do know. The bodies themselves have been made for a while now. For some reason there is a hold up on the butterfly plate. I'm not sure why, other than the fact the machine shop keeps ****ing around (can you say fired after this run?)

Secondly, it's a billet 65mm TB. I'm pretty sure RSM's is only a ported unit.

[dongalonga]

Can you give me a rough idea of the price of this TB, because I may cancel my order with RSM if it is the right price and available withing 3 weeks guarenteed.

[Sprucegagt]

Originally Posted by dongalonga

Can you give me a rough idea of the price of this TB, because I may cancel my order with RSM if it is the right price and available withing 3 weeks guarenteed.

I have been waiting for this to be done for over 2 months now. I doubt it will be ready within 3 weeks.

[Pipelayaz]

RSM's TB isn't ported....its built to 62MM spec's.

[phantom505]

From their site:

"62mm Throttle Body - The diameter of the TB is 62 mm right through with a 62 mm diameter CNC throttle plate. Bolt-on install, 10+ HP gain."

http://www.rsmracing.com/62mmtbbefaft.jpg

Sounds and looks ported to me. The only thing CNC'ed there is throttle plate. I won't touch the BS gain.

I'll see if I can get Ty on here to say when.... how long could it take to make 65mm throttle plates?

[tejohnson]

Ty is pretty hard to get in touch with lately, he must be rather busy. Hope everything is ok...

[dongalonga]

Yeah well at this point looks like I will be waiting for the RSM unit. I don't believe the BS gain either. Maybe if I was to get the entire top end of the motor P&P then I would see around 10Hp.

[Babalouie]

Actually, the tb is machined, not hand ported. A long time ago I posted a dyno sheet with my results on their 62tb with the port matched manifold. 14hp at the wheels it gave me. Maybe I was a lucky one???

[phantom505]

But what did you have done prior to the TB? I'm sure you can see some really respectable gains. For example, if you had a CAI, computer, headers, exhaust done, I would expect you to see some good gains.

BTW, I didn't mean it was "hand" ported vs. "machine" ported (which you can use a CNC for that...) I was refering to the fact it was a stock TB that was gutted, versus a billet TB. The billet TB does not have the coolant channels, and is made from the ground up. And this TB is a 65mm. I don't think you can port the stocker out that far.

[dongalonga]

I didn't realize the RSM TB was as good as it sounds according to this recent post. Well maybe it will be worth the $$$ afterall, especially considering I don't plan on running a race motor in my car. I just want it to be as fast as my Buell XB9

[Babalouie]

Originally Posted by phantom505

But what did you have done prior to the TB? I'm sure you can see some really respectable gains. For example, if you had a CAI, computer, headers, exhaust done, I would expect you to see some good gains.

BTW, I didn't mean it was "hand" ported vs. "machine" ported (which you can use a CNC for that...) I was refering to the fact it was a stock TB that was gutted, versus a billet TB. The billet TB does not have the coolant channels, and is made from the ground up. And this TB is a 65mm. I don't think you can port the stocker out that far.

I had an RSM intake, and a 2.5" exhaust right from the downpipe and front tranny mount. Now I tig what you ment about the TB's being machined and stuff. I don't think you can go bigger than 62mm on the stock core, that is why they only go up to 62mm.

[phantom505]

Yeah, those mods would work well with a TB. Mostly because you TB was actually a point of restriction. I guess I simply disagree with putting HP ratings on products when they require other mods to make it work.

[speedyguy]

Ty is alive.

Sorry I have been busy.

I am also waiting; yup I do not personally port the units in my back yard.

The main billet housings are done and we are waiting on the valve plates to be finished.

I am very happy with the result of this unit and unlike my completion this unit will span the build life of the engine. You can use the throttle body on a stock UIM and taper the port match so you gain the best flow with the least amount of work. I am not going to go into the gains from stacking or a velocity stack but this is what you will get with a stock 3.4 UIM port matched and tapered.


when you are ready you can upgrade to a 3.5l UIM and this unit will bolt right up and already matches the unit. No pointless crappy adapters.

Yes we have adapted 3.5 UIM's already finished and will be available with the 65mm TB.

You would think we had a turbo planned ...hmmm

Oh and just for fun when you get a chance remind the 3.8l guys what there GP is turning into. A superior Grand Am. Known as the G6. oooh I love this, can you tell I love this?

Ty

[coupe]

The problem for me is i dont want a bigger TB or ported UIM or any of that crap until someone with the means makes a CAM and HEADS. At this point a 3.5L UIM and a 65mm TB would do nothing for me but eat a hole in my pocket. Our N/A engines dont out flow our stock TB's anyway.
God i want CAM and HEADS. I dream about it at night.

[phantom505]

Since we know damn near everything there is to know about the heads, I don't see how you can say we don't have them. No, nobody *sells* them *yet*. But there is plenty of knowledge. Everytime cams come up everyone talks and nobody puts money on the table. So it never happens. I have other things going so I haven't really much cared to pursue it right now. It will happen, eventually.

[Sprucegagt]

So in bringing back what really seems to be a dead topic. I've got to ask why were these even mentioned. Yeah I know you have to be patient with this stuff, but come on. It can't take over 5 months to make throttle bodies. I could of had my own custom made in that time. This is the final time I will be resurrecting this thing, so if you actually have something to sell say so and put the date it will go on sale. If not don't bother with the unless hype.