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89_Red_Xr7
12-31-2002, 03:22 PM
hey all, what size is the stock throttle body? is there any difference in the 89-93 tb's and 94-95 tb's?

thx

Jimmy 2Coupes
12-31-2002, 03:32 PM
The stock throttle body size is 60mm. There is no difference between a 89-93 TB and the 94-95 TB as far as size is concerned but some earlier model SC's have TB's with a coolant passage. I'm not sure which years but I know the 94-95 TB's don't have the coolant passage.

mn12sc35th
12-31-2002, 03:41 PM
From what I've always heard, the stock on 89-93s are 55mm and the 94-95 has a 60mm unit

Jimmy 2Coupes
12-31-2002, 03:57 PM
mn12sc35th, I think your getting the MAF and TB mixed up. The stock MAF on 89-90 I believe is 55mm while the 91-95 got a 70mm MAF. The stock TB's are the same size from 89 to 95, 60mm.

mn12sc35th
12-31-2002, 04:00 PM
I know the MAF sizes. But I'm almost positive that I saw someone looking for a 94-95 one for an older model car, and I'm pretty sure I had read that the 89-93's were also 55mm. After all, what would be the point in a bigger MAF than TB?

Whoops I had this backwards

I meant what would be the point in having a 60mm TB and a 55mm MAFS. I mean if the MAFS can't let in as much air as the TB can use, what's the point?

JAFO
12-31-2002, 06:29 PM
I was just looking at the MP setups on the SCP site. I'm wondering some of these same things. However, on the MAF's, the '91 + are 70mm. Mine's a very early '91.
Earlier discussion on MAF (http://www.sccoa.com/forums/showthread.php?s=&threadid=10114)
I'd also like a definitive answer on the TB. Seems to me the MAF may be okay, but it might be more advantageous to swap the TB out if it really is a lot smaller.
Stock 70mm MAF, new 70mm TB & SC inlet plenum (http://www.magnumpowers.com/plnm.html). Wouldn't that be a good setup?

Jimmy 2Coupes
01-01-2003, 01:11 PM
Believe me guy's, the stock factory throttle body on all SC's are/were 60mm. Check out this link for more info and happy new year to all.


www.sccoa.com/forums/showthread.php?threadid=12502

35th_tbird
01-01-2003, 01:37 PM
according to that link, the 75mm TB is overkill except for race engines. but what about the MP 85mm? maybe he meant for stock systems. i'm looking at doing the full MP system (when my budget allows), and that definitely wouldn't be stock, so would i be o.k.?

mannysc
01-01-2003, 05:21 PM
the late 91s and up had 70mm mass which can be moded much bigger by cutting out center post and drilling out tube 15/32, the tb on the 89-90 is 55 mm the 91-93 are 60 mm not sure on 94-95,

JAFO
01-01-2003, 05:59 PM
So would it not be advisable to upgrade the TB before the MAF? I was thinking that I'd eventually put in the 70mm TB here:
http://www.supercoupeperformance.com/throttle.htm
Seems that would be a good match to the stock 70mm MAF. Or am I thinking incorrectly here?

XR7 Dave
01-01-2003, 11:47 PM
All SC TB's are the same. Any mods that you do should start at the front and work backward. There is nothing negative about having a larger MAF than TB. Just remember that the stock inlet plenum is only 65mm anyhow.

Perhaps Ford went with a small MAF to restrict power so that the Mustang could have some breathing room. I don't suppose anyone really knows.

JAFO
01-01-2003, 11:53 PM
Seems as though if you aren't upgrading the MAF, TB, intake plenum & SC top that you really won't see any improvement. Only takes one bottleneck to stop up the works and prevent any gains. All or none, although buying one at a time is easier on the wallet. Once you've done all you ought to see a good gain. Or am I way off base???