65mm vs 70mm??

sport200

Member

Feb 18, 2008

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LAWRENCEBURG, IN

Jun 29, 2008

#1

• Jun 29, 2008

• #1

Hey, I'm thinking about going to a 70mm throttle body. I have a 65 now, has anyone done the (HP) numbers on these?

 

2000xp8

SN Certified Technician

Aug 8, 2003

8,016

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NJ

Jun 29, 2008

#2

• Jun 29, 2008

• #2

Depending on your mods, it may do little to nothing.

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

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#3

• Jun 29, 2008

• #3

List of current mods owuld help

 

sport200

Member

Feb 18, 2008

73

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LAWRENCEBURG, IN

Jun 29, 2008

#4

• Jun 29, 2008

• #4

MODS

302 STANDARD BORE, 185 CC AFR HEADS, COBRA INTAKE, 65MM THORTTLE BODY, 75MM MASS AIR,X303 CAM,COBRA ROLLER ROCKERS,24LBS INJECTORS,BBK 1 5/8 LONG TUBES,PULLIES,373'S

 

SVT32VDOHC

waiting for the next hack atta

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Motor City

Jun 29, 2008

#5

• Jun 29, 2008

• #5

IF you go with the bigger throttle body, you will need to bore out the opening of your intake. How big is the Cobra intake stock?

 

sport200

Member

Feb 18, 2008

73

17

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LAWRENCEBURG, IN

Jun 29, 2008

#6

• Jun 29, 2008

• #6

I can feel that the intake side is bigger than the throttle body side. Thats why I was wanting to do this? any ideas?

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,184

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Jun 29, 2008

#7

• Jun 29, 2008

• #7

Cobra intake inlet is 70mm


you could prob run a 70mm, might gain a few ponies, but i wouldn't count on huge gains.

 

justagt

Founding Member

Oct 26, 2000

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Jun 29, 2008

#8

• Jun 29, 2008

• #8

price

Unless you are getting a deal on the 70mm, I think it would be a waste of $ and gains would be very minimal at best.

My vote would be finish off the rest of your exhaust if you want your car to breathe better.

A highflow catted midpipe and or a catback would do a lot more for you.

 

sport200

Member

Feb 18, 2008

73

17

18

LAWRENCEBURG, IN

Jun 29, 2008

#9

• Jun 29, 2008

• #9

I have a bbk h-pipe no cats, 2 1/2 -2 chamber flowmasters with turn downs?

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

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#10

• Jun 29, 2008

• #10

Future mods?

 

wythors

Get off my lawn!!!

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C Addle

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#11

• Jun 29, 2008

• #11

Mustang5L5 said:

Cobra intake inlet is 70mm

Click to expand...

The Cobra throttle body opening is actually 65mm.

I switched from a Cobra with the appropriate 65mm throttle body to a Tmoss ported GT40 tubular with a 70mm t/b (the GT40 has a 70mm opening) and picked up 5 horsepower and 12 lb/ft of torque at the rear wheels. I would attribute most, if not all, of the gain to the porting rather than the t/b. Other mods can be found in my sig.

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,184

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Jun 29, 2008

#12

• Jun 29, 2008

• #12

wythors said:

The Cobra throttle body opening is actually 65mm.
.

Click to expand...

I was referring to the inlet of the upper intake manifold.

I have a 65mm TB on my Cobra Intake and there is a lip in there, so i'd imagine it's slightly bigger than 65. Not sure if it's 70 though

 

wythors

Get off my lawn!!!

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#13

• Jun 29, 2008

• #13

On my Cobra intake, the Edelbrock 65mm t/b fit perfectly.

 

JKidd

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Aug 21, 2007

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Suffield, CT

Jun 30, 2008

#14

• Jun 30, 2008

• #14

I'd skip it. Might make a bigger difference if your car was forced induction, but I doubt you will feel anything at all by switching. Put the money toward porting your Cobra lower. That would yield better results (in my opinion). The rest of the motor seems set up pretty well.

I'd work at getting your set up to run the absolute best it could before you start throwing other parts at it.

 

B

blackmust5.0

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May 15, 2008

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Jun 30, 2008

#15

• Jun 30, 2008

• #15

MM&FF did a TB test years ago on a car with moderate mods like heads & intake and they found that the 65mm provided the most hp over stock. The test car actually made less power (than the stock 58mm TB) when going to 70mm and larger TBs.

 

5spd GT

"the 5.0 owns all"

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#16

• Jul 1, 2008

• #16

Spend your money elsewhere.

 

Yobi1Kanobi

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Apr 9, 2003

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Jul 1, 2008

#17

• Jul 1, 2008

• #17

I am gonna say that the gains your gonna see from a throttle body swap with your current mods are going to be minimal. Get some gears Instead or pick another MOD.

 

1

1/4mile_runner

New Member

Jun 1, 2008

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Jul 2, 2008

#18

• Jul 2, 2008

• #18

Spend the money on an 85mm MAF w/ a power pipe.