Has anyone ever tried these? On our cars they come 60,70,80, and 100mm

http://cgi.ebay.com/ebaymotors/70mm-Universal-Throttle-Body-CNC-BILLET-GDF-2-5RS-R30-_W0QQcmdZViewItemQQhashZitem4aa4e69e2eQQitemZ320594157102QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

Dino did IIRC.

I think it was too much or something. He will probably chime in.

"Universal" does not mean "direct fit" or "bolt on". These are not a bolt on part for anything except the car they were made for, probably a Mustang from the look of it.

70mm is too big for pretty much anything you're ever going to do with a 420A, and there are 60mm TBs that can bolt on with much less work already available.

even with a built engine with forced induction? Im gettin a venom manifold almoast free and i can weld the flange on it. It would be able to work. Just wanted to see if anyone else has tried

If you're planning to use your TPS and IAC, you'd be better off buying one that was made for our cars. Cheaper in the long run, as all the work making it fit our cars and using our sensors has been done for you. Just my .02

Originally posted by freakingbori617
even with a built engine with forced induction? Im gettin a venom manifold almoast free and i can weld the flange on it. It would be able to work. Just wanted to see if anyone else has tried

http://www.nawdu.de/pics/venom/

yeah, some one else has. It was on the car for a couple months, driven < 100 miles, and now it sits on a shelf in my garage. The top end felt great, but it drove like shit otherwise. Just too big.

I'll sell you the entire setup for $200 if you really want to try it out.

is that 70mm it looks huge? what gets to me is that honda guys use 62 or 66mm throttle bodies and they arent even turbo. Im planin on a full rebuild with turbo. I am turbo now only at 8psi.

IMO, 70mm is way too big for the street (even turbo). You might want to try a 65mm Mustang TB. I'm running one on the NA right now (well, actually its off a Crown Vic or some kinda shit). For $35 I was happy.

But then, I run MSnS.

i remember reading somewhere, that on our engines, wether its turbo or N/A, get to the point where 60mm is like 80mm, which is like 100mm. They said anything after sixty really doesn't matter...

My big question is...
Why are Ls1chevy guy only running 70 mm tbs, those engines have 5.7L of displacement. Thats 3 times our motors but they only need 10mm more air?

Originally posted by Fasttopass
My big question is... Why are Ls1chevy guy only running 70 mm tbs, those engines have 5.7L of displacement. Thats 3 times our motors but they only need 10mm more air?

A circle is exponential.

So the area of a 52mm = 21.24 cm2

60mm = 28.27 cm2

70mm = 38.48 cm2

So that 10mm difference has almost 25% more area than a 60mm and almost 50% more area than a 52mm.

Originally posted by teklein

Originally posted by Fasttopass My big question is... Why are Ls1chevy guy only running 70 mm tbs, those engines have 5.7L of displacement. Thats 3 times our motors but they only need 10mm more air?

A circle is exponential. So the area of a 52mm = 21.24 cm2 60mm = 28.27 cm2 70mm = 38.48 cm2 So that 10mm difference has almost 25% more area than a 60mm and almost 50% more area than a 52mm.

This.

The math doesn't lie.

So does that mean there is a 25% flow increase? Or are the Area and flow capiblities differant formulas?

Originally posted by Fasttopass
So does that mean there is a 25% flow increase?

What it means is there is a potential for a 25% increase (if that what the number figures out to be. I just took your word for it).

It would be up to the rest of the build of the engine as far as how much more will flow.

K that makes sense, I just thought that airflow wasn't exactly related to area. Like I thought that an area increase of say 25% would only have a flow increase of something like 12.5%. What I'm trying to say is I thought that an increase of area was only equal to half an increase of flow