Throttle Body question

mustangLX92 · 11-14-2001, 11:19 AM

Would my car benifit from a larger throtle body? If so, what size?
Thanks

mustangLX92 · 11-14-2001, 11:21 AM

My sig is messed up. I also have gt40 heads

Mr 5 0 · 11-14-2001, 11:30 AM

Your engine would benefit from adding a 65mm TB, however I would consider upgrading the exhaust, first.

mustangLX92 · 11-14-2001, 11:38 AM

I have an offroad h pipe, flowmaster catback system. Also how can i tell what size tb i have now?

Smokedawg · 11-14-2001, 11:46 AM

I believe that the stock tb size is either 58mm or 60mm. Usually if you have a aftermarket tb, it will say the brand name right on top of it.

2FastLX · 11-14-2001, 11:50 AM

It would have the name if it was something other than a Ford TB. Do you still have the stock headers? If so get rid of those things. I'd suggest long tubes, but they are a pain to install so that's up to you. After that a 65mm TB would be a good next mod.

Mr 5 0 · 11-14-2001, 02:51 PM

When I posted my response your signature was - as you said - messed up and didn't contain the exhaust info it now shows.

The stock throttle body is 60mm. You can measure it (inside diameter) using a string, if necessary.

If you bought the car with the GT40 heads and Cobra intake installed, it should have had the TB upgraded too but you won't know for sure without measuring it.

fiveohpatrol · 11-15-2001, 01:26 AM

doesnt the cobra intake have a 65mm opening where the EGR spacer bolts up to it? i think it does

if you are having trouble measuring it, then pull off the intake tube and (by hand) open the throttle body valve and look inside to see if there is a difference in the size of the TB/EGR spacer and the intake inlet port

hope this helps

Chevyguy · 11-15-2001, 03:43 PM

Hmm it seems to me that a upgrade from a 60 mm to a 65 mm TB is pretty mild. According to my MAC catalog, they recomend their 70 mm TB even for a stock intake. Heck even the 4.6 takes a 65 mm stock and they put 70 mm upgrades on those.

Of course I have a totally stock intake system except for a K&N filter and removed silencer, so I have absolutley no experience here.

blue00gt · 11-15-2001, 04:14 PM

While going from 60mm to 65mm doesn't sound like much, you are increasing the cross-sectional area by over 17%.
As for 70mm on a stock 5.0, you will lose power.

Mach 1 · 11-15-2001, 04:29 PM

take it from somebody who has had both a 70MM BBK and a 65MM Ford motorsport. 65MM is the way to go, and also the ford TB is much better quality than the BBK,. not to mention cheaper. You lose throttle response with the 70 mm and simply dont need it. Saleen uses a 65 mm on his S-351.

Chevyguy · 11-15-2001, 05:42 PM

That's why you guys rule, I had convinced myself a 70mm was the way to go, now I am properly informed

65 mm FMS all the way yeehaaaa

11-14-2001, 11:19 AM	#1
mustangLX92 Registered Member Join Date: May 2001 Location: Maryland Posts: 138	Throttle Body question Would my car benifit from a larger throtle body? If so, what size? Thanks __________________ Motorsports springs, Lakewood drag struts, Southside rear lower arms. Motorsports upper arms. Lakewood Drag shocks. Southside rear drag springs, sub frames, 3.55 Gears, Cobra intake, 70mm TB, GT40 heads, X Cam, 1.6 Crane RR's, 110lph fuel pump, AFPR, offroad h pipe, Flowmaster catback, 1 5/8" Motorsport headers, under drive pulleys, cold air induction, Black Magic Fan, Pro 5.0, Weld Draglites.

11-14-2001, 11:21 AM	#2
mustangLX92 Registered Member Join Date: May 2001 Location: Maryland Posts: 138	My sig is messed up. I also have gt40 heads __________________ Motorsports springs, Lakewood drag struts, Southside rear lower arms. Motorsports upper arms. Lakewood Drag shocks. Southside rear drag springs, sub frames, 3.55 Gears, Cobra intake, 70mm TB, GT40 heads, X Cam, 1.6 Crane RR's, 110lph fuel pump, AFPR, offroad h pipe, Flowmaster catback, 1 5/8" Motorsport headers, under drive pulleys, cold air induction, Black Magic Fan, Pro 5.0, Weld Draglites.

11-14-2001, 11:38 AM	#4
mustangLX92 Registered Member Join Date: May 2001 Location: Maryland Posts: 138	I have an offroad h pipe, flowmaster catback system. Also how can i tell what size tb i have now? __________________ Motorsports springs, Lakewood drag struts, Southside rear lower arms. Motorsports upper arms. Lakewood Drag shocks. Southside rear drag springs, sub frames, 3.55 Gears, Cobra intake, 70mm TB, GT40 heads, X Cam, 1.6 Crane RR's, 110lph fuel pump, AFPR, offroad h pipe, Flowmaster catback, 1 5/8" Motorsport headers, under drive pulleys, cold air induction, Black Magic Fan, Pro 5.0, Weld Draglites.

11-14-2001, 11:46 AM	#5
Smokedawg Tires Fear Me... Join Date: Jan 2001 Posts: 867	I believe that the stock tb size is either 58mm or 60mm. Usually if you have a aftermarket tb, it will say the brand name right on top of it. __________________ 1990 Mustang GT- 347 Stroker-Tremec 3550-Compucar Nitrous, AFR, Systemax Intake, AFM, 30lbers, 70MM TB, 76mm MAF, full suspension and lots more 1995 Chevy S-10 406 SBC, Dual tunnel ram, Dart heads, Nitrous, full tub, 4-link, adjustable drag shocks, coil-overs, 9in rearend, 4.56 gears...etc

11-14-2001, 11:50 AM	#6
2FastLX The Photoshop Guru Join Date: Feb 2001 Location: Mecca, Indiana Posts: 1,419	It would have the name if it was something other than a Ford TB. Do you still have the stock headers? If so get rid of those things. I'd suggest long tubes, but they are a pain to install so that's up to you. After that a 65mm TB would be a good next mod. __________________ Project: 1988 Coupe - EFI 5.8L Twin Turbo with Victor intake, Canfield heads, F303 cam, March aluminum underdrive pulleys, TKO (or T56 if funds permit), PBR twin piston calipers and 13" rotors up front, 94 Cobra rear calipers and 12" rotors on the rear, 3.73's, Griggs K-member, tubular front control arms, torque arm and panhard bar, polished 99 Cobra wheels. "The GR-40 kit installation is now complete, and the humble Fox-chassis car will now out-corner and out-stop a ZR-1 or a Viper, and support massive horsepower additions with perfect balance." Griggs Racing ICQ# 42269241

11-14-2001, 11:30 AM	#3
Mr 5 0 Conservative Individualist Join Date: May 1997 Location: Wherever I need to be Posts: 7,487	Your engine would benefit from adding a 65mm TB, however I would consider upgrading the exhaust, first.

11-14-2001, 02:51 PM	#7
Mr 5 0 Conservative Individualist Join Date: May 1997 Location: Wherever I need to be Posts: 7,487	When I posted my response your signature was - as you said - messed up and didn't contain the exhaust info it now shows. The stock throttle body is 60mm. You can measure it (inside diameter) using a string, if necessary. If you bought the car with the GT40 heads and Cobra intake installed, it should have had the TB upgraded too but you won't know for sure without measuring it.

11-15-2001, 01:26 AM	#8
fiveohpatrol I'd rather be basketweaving Join Date: Feb 2000 Location: Indianapolis Posts: 2,551	doesnt the cobra intake have a 65mm opening where the EGR spacer bolts up to it? i think it does if you are having trouble measuring it, then pull off the intake tube and (by hand) open the throttle body valve and look inside to see if there is a difference in the size of the TB/EGR spacer and the intake inlet port hope this helps __________________ NMRA O/C 9516 NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft

11-15-2001, 03:43 PM	#9
Chevyguy Backyard Mechanic/Chemist Join Date: Feb 2001 Location: Acton MA USA Posts: 435	Hmm it seems to me that a upgrade from a 60 mm to a 65 mm TB is pretty mild. According to my MAC catalog, they recomend their 70 mm TB even for a stock intake. Heck even the 4.6 takes a 65 mm stock and they put 70 mm upgrades on those. Of course I have a totally stock intake system except for a K&N filter and removed silencer, so I have absolutley no experience here. __________________ 2001 Crown Vic Maurader Airbox/MAF, DR chip Edel IAS shocks Single exhaust :wtf: 93 P-71 Vic interceptor Backup car now 90 5.0 LX Notch SOLD 74 Chevy Laguna type S-3 454 under construction Currently apart undergoing bodywork.

11-15-2001, 04:14 PM	#10
blue00gt Mustang Addict Join Date: Jan 2001 Location: McKinney, TX Posts: 1,294	While going from 60mm to 65mm doesn't sound like much, you are increasing the cross-sectional area by over 17%. As for 70mm on a stock 5.0, you will lose power. __________________ Strike down the unroadworthy! 2000 GT Atl. Blue: '03 Cobra motor - 465rwhp/473rwtq, T-56 6-speed, full MM TA/PH & tubular K-member suspension, Saleen body, 17" Torq-Thrust II's, M/T ET Street radials, and lots more '94 Rio Red Cobra: All the bolt-ons, 3.73s

11-15-2001, 04:29 PM	#11
Mach 1 Registered Member Join Date: May 1999 Location: Georgia Posts: 3,866	take it from somebody who has had both a 70MM BBK and a 65MM Ford motorsport. 65MM is the way to go, and also the ford TB is much better quality than the BBK,. not to mention cheaper. You lose throttle response with the 70 mm and simply dont need it. Saleen uses a 65 mm on his S-351. __________________ 2002 GT 1993 GT (SOLD) '93 Mustang GT RHC member #142

11-15-2001, 05:42 PM	#12
Chevyguy Backyard Mechanic/Chemist Join Date: Feb 2001 Location: Acton MA USA Posts: 435	That's why you guys rule, I had convinced myself a 70mm was the way to go, now I am properly informed 65 mm FMS all the way yeehaaaa __________________ 2001 Crown Vic Maurader Airbox/MAF, DR chip Edel IAS shocks Single exhaust :wtf: 93 P-71 Vic interceptor Backup car now 90 5.0 LX Notch SOLD 74 Chevy Laguna type S-3 454 under construction Currently apart undergoing bodywork.

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