Throttle body, headers, underdrive pulleys questions - IMBOC
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post #1 of 11 (permalink) Old 10-07-2019, 11:17 AM Thread Starter
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Question Throttle body, headers, underdrive pulleys questions

I'm thinking of getting a larger TB. Is the stock Bullitt TB 55mm?

Do I need a tune if I go with a bigger TB (60 or 62mm), Steeda underdrive pulleys, and BBK ceramic shorty headers?
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post #2 of 11 (permalink) Old 10-07-2019, 05:11 PM

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Are you sure you want to do this? How much faster will you be? Is it worth the cost?

Put some loud mufflers on it......you'll think you have a GT500!

Keep it stock and enjoy what you have......LOL!

Most four banger out there will blow your doors off....

ARMY TC
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IT MUST BE THE GREEN!!!!
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post #3 of 11 (permalink) Old 10-08-2019, 02:10 AM
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Once you modify the air intake sizes beyond OEM specs, a tune is necessary. That includes the CAI tube, throttle body and intake manifold. The computer is set for the OEM specs.

The Bullitt throttle body is the GT stock 55mm. The next step is 62mm. A tune is required.

A tune is set for a specific octane rating, so the unique Bullitt "octane sensor" (Knock adapability) is disabled. Good canned tunes are hard to find.

Just adding the FRPP 62mm throttle body ($600 and very pretty) is the start. To gain the full effect, the FRPP intake manifold ($600), FRPP hot rod cams ($750) and short or long tube headers must be added to gain the full effect of increased HP and torque at high RPM. Even so, torque and HP gain at low RPM is minimal.

Some aftermarket TB's reuse the motor from your OEM TB, which is why they are cheaper. But binding issues can then happen.

I have the Steeda underdrive pulley, good, cheap performance mod. No tune needed. No issue with A/C cooling and power steering.
MY motor is stock. run 87 octane for road trips and am happy, saving $. I do run a 93 tune for the road course track, mainly as the tune eliminates throttle lag at apex.

Yes, the BBK short tube headers will increase some HP and give some louder noise at a reasonable price. No tune needed.

Mufflers are a totally different issue, but with no tune needed.

For performance, look at a 1piece aluminum drive shaft is great. No tune needed. Over half the the rotational mass.You will definitely feel this on acceleration and no more drive shaft banging. You will then want a new shifter (MGW).

Hopes this helps. Look for no tune needed. Ford did a good job with the OEM computer. Just beware the law of unintended consequences of vehicle modification.

Last edited by tossass4370; 10-08-2019 at 03:03 AM.
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post #4 of 11 (permalink) Old 10-08-2019, 01:06 PM Thread Starter
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Thanks tossass4370, that's the information I was looking for. I'll skip the TB, because I don't want to mess with tuning.

I have the headers, MGW shifter and Blowfish bracket in boxes. I'll save my money and get the pulleys and driveshaft later this winter.

Do you have the two pulley set?
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post #5 of 11 (permalink) Old 10-08-2019, 07:50 PM
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Yes, the 2 pulley set, allows you to use the OEM size serpentine belt. And check condition of current belt.

Also look at the Steeda throttle body spacer. No tune needed. 2-4 hp increase.

Get on Steeda email list for sales on their manufactured products, usually around holidays.
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post #6 of 11 (permalink) Old 10-09-2019, 12:12 PM Thread Starter
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Will the stock CAI tube fit with the Steeda TB spacer?
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post #7 of 11 (permalink) Old 10-19-2019, 11:37 PM
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Yes, the Steeda spacer will fit with the oem cai tube and oem throttle body. The spacer goes behind the throttle body.

Last edited by tossass4370; 10-19-2019 at 11:48 PM.
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post #8 of 11 (permalink) Old 02-13-2020, 12:36 AM

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Quote:
Originally Posted by ARMY TC View Post
Are you sure you want to do this? How much faster will you be? Is it worth the cost?

Put some loud mufflers on it......you'll think you have a GT500!

Keep it stock and enjoy what you have......LOL!

Most four banger out there will blow your doors off....

ARMY TC
What he says lol
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post #9 of 11 (permalink) Old 02-15-2020, 08:26 AM

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RE: Tunes- while I'm sure everyone has their own take on aftermarket tunes, I tried several on my Bullitt and had issues w/all, except one: STEEDA. And I'll leave it there and say no more.
Lee
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post #10 of 11 (permalink) Old 03-10-2020, 01:56 AM Thread Starter
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Originally Posted by Freefallin08 View Post
What he says lol
I know... LOL.
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post #11 of 11 (permalink) Old 03-15-2020, 09:16 AM
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Brenspeed tunes work great on my '09, if you think one's needed.


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