Throttle body, headers, underdrive pulleys questions - IMBOC
 7Likes
  • 1 Post By ARMY TC
  • 4 Post By tossass4370
  • 2 Post By tossass4370
 
LinkBack Thread Tools Display Modes
post #1 of 7 (permalink) Old 10-07-2019, 12:17 PM Thread Starter
BULLITT In The Chamber
 
banzaibullitt's Avatar
 
Join Date: Jul 2019
Location: Minneapolis, Minnesota
Bullitt Year: 08
Bullitt Color: HG
Bullitt Serialized Number: 4981
Posts: 31
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?
banzaibullitt is offline  
Sponsored Links
Advertisement
 
post #2 of 7 (permalink) Old 10-07-2019, 06:11 PM

Monster BullittHead
 
Join Date: Jun 2003
Location: Western PA
Bullitt Year: 09
Bullitt Color: Highland Green
Bullitt Serialized Number: 6498
Posts: 957
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
bullit4404 likes this.

IT MUST BE THE GREEN!!!!
ARMY TC is online now  
post #3 of 7 (permalink) Old 10-08-2019, 03:10 AM
Lifetime Supporting Member
 
tossass4370's Avatar
 
Join Date: Dec 2011
Location: Tallahassee FL
Bullitt Year: 08
Bullitt Color: HG
Bullitt Serialized Number: 4370
Posts: 441
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 04:03 AM.
tossass4370 is offline  
 
post #4 of 7 (permalink) Old 10-08-2019, 02:06 PM Thread Starter
BULLITT In The Chamber
 
banzaibullitt's Avatar
 
Join Date: Jul 2019
Location: Minneapolis, Minnesota
Bullitt Year: 08
Bullitt Color: HG
Bullitt Serialized Number: 4981
Posts: 31
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?
banzaibullitt is offline  
post #5 of 7 (permalink) Old 10-08-2019, 08:50 PM
Lifetime Supporting Member
 
tossass4370's Avatar
 
Join Date: Dec 2011
Location: Tallahassee FL
Bullitt Year: 08
Bullitt Color: HG
Bullitt Serialized Number: 4370
Posts: 441
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.
bullit4404 and banzaibullitt like this.
tossass4370 is offline  
post #6 of 7 (permalink) Old 10-09-2019, 01:12 PM Thread Starter
BULLITT In The Chamber
 
banzaibullitt's Avatar
 
Join Date: Jul 2019
Location: Minneapolis, Minnesota
Bullitt Year: 08
Bullitt Color: HG
Bullitt Serialized Number: 4981
Posts: 31
Will the stock CAI tube fit with the Steeda TB spacer?
banzaibullitt is offline  
post #7 of 7 (permalink) Old 10-20-2019, 12:37 AM
Lifetime Supporting Member
 
tossass4370's Avatar
 
Join Date: Dec 2011
Location: Tallahassee FL
Bullitt Year: 08
Bullitt Color: HG
Bullitt Serialized Number: 4370
Posts: 441
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; 10-20-2019 at 12:48 AM.
tossass4370 is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the IMBOC forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome