TeamCapri

Tech, Repairs, Upgrades => Capri XR-2 89-94 => Topic started by: greywolf27030 on April 25, 2017, 09:43:40 PM

Title: Larger throttle body
Post by: greywolf27030 on April 25, 2017, 09:43:40 PM: I did a data base search on throttle bodies and found some info on boring out the existing TB and a reference to going big bore to one off a Thunderbird which is much larger. I believe our TB is 55MM and the BP use a 60mm. After porting the intake to match, wouldn't this give you some good improvement on a mildly modified engine?

Jack Byrd
Title: Re: Larger throttle body
Post by: Rod Bacon on April 25, 2017, 10:39:33 PM: It's going to depend entirely on your setup. You'd certainly need a de-restricted intake (even a drilled airbox, like I did on the weekend) and a bigger exhaust to get any benefit out of a larger diameter TB, in my opinion. Keen to hear if anyone has done this to a turbo.
Title: Re: Larger throttle body
Post by: greywolf27030 on April 27, 2017, 07:59:12 AM: What is a drilled air box?
Title: Re: Larger throttle body
Post by: SHOwn on April 27, 2017, 12:27:18 PM: AZGTX replied to one of my inquiries about how to open up induction with these answers. It's the stock air box with a bunch of holes.
Quote from: azgtx on October 15, 2016, 12:38:31 AM
As for the air cleaner, I don't like the cones or the foam types. After I tore down a motor that used those it really changed my mind. Use the stock air box and use a hole saw to open it up a bit and stay with the oem type panel filters. You can buy a K&N for this and the BF323 application if you prefer.
Title: Re: Larger throttle body
Post by: Rod Bacon on April 27, 2017, 09:04:11 PM: Quote from: greywolf27030 on April 27, 2017, 07:59:12 AM
What is a drilled air box?

Take a look at the photos posted by Yuri in this thread...

http://teamcapri.com/forum/index.php/topic,1621.msg4801.html#msg4801
Title: Re: Larger throttle body
Post by: Casper on April 28, 2017, 10:30:01 AM: The holes in the stock air box does wonders - even for the N/A which I have opened up the air box as well. Much more rev ability - it used to run out of puff quite early - now it can rev higher and feel like it is doing something rather than wheezing out (not as good as the turbo though).

The turbo or N/A in Oz doesn't (well at least both of mine) have the long air intake prior to the air box (as shown in the older post) - that seems to be quite restrictive.

I have found opening up air capacity of the air box does wonders on any car - not any more power per se but allows more response at different rev ranges - my V8 Falcon (5.4litre DOHC) had a definite lag in low end which was resolved with better breathing at the air box - much more responsive - just some extra holes underneath - I imagine this is just as good as the expensive cold air intake systems offered by various.
Title: Re: Larger throttle body
Post by: greywolf27030 on April 28, 2017, 10:44:36 AM: Lol....after posting the question, it dawned on me what you were talking about. Glad I did though, great pics.

Thanks, Jack Byrd