Hey Guys
I just completed installing a 65mm throttle body on my V10 SD. It is not what I expected, performance wise. Maybe something isn't right. Hope that those of you who have done this mod might point me in the right direction. (I think this may be a long post-)

I initially installed the TB as delivered. The truck would not idle at all. The voltage @ the center post of the TPS was 1.81 vdc w/ the idle screw completely backed out. The initial measurement was .94 vdc. Also I did not feel comfortable having to put a spacer in between the the throttle pedal lever and the end of the cable.

So, I decided to transfer the stock TB's throttle cable cam to the BBK. This was no easy task, but it turned out real well. (I am not going to go into details about how I did this, as it is irrelavant and will add to much length to this post.)

After installing the modified BBK, the engine idled perfect. The TPS voltage was 1.01vdc, I could not get the voltage to go any less.
I let the truck warm up for 15 minutes, while I put the tools away. I then went on a test drive; I was rather disapointed. Seat of the pants says that it lost alot of low end. Top end seams about the same or may be a bitless.

I am wondering if the computer is re-learning a new fuel curve. I disconnected the negative terminal when removing/installing, that should have reset the computer right?

I purchased this after reading several post that claimed better throttle response, faster revving, etc.. My other mods include an FIPK, Borla dual-out catback and a Superchip 1705(?) chip.

Tommorow, I am going to enlarge the 2 hole on the TPS to allow for adjustment. This should allow me to get the TPS voltage back down to .94 vdc.

Do any of you have any words of wisdom? I sure would appreciate it.

 

Try a new TPS?

I never heard of swapping the cam around, but then I got the ACCUFAB. I have heard to use a new TPS after a TB swapout.

Have you checked the throttle cable at the pedal?? I had to disconnect mine to get slack.

 

Heavy,
Accufab was my first choice, after looking at the intake, and the POS BBK, it should have been my only choice!

I switched the cams by filing/grinding both off nice and neat. My thinking was that I could mig/spot it together. Not a ferous metal. So, I used the epoxy putty method. Yes, I did check the slack at the peddle. I did add app. 1/2" spacer. The spacer increased the peddle travel more than stock (i.e. raised the peddle from the floor board) There is absolutely no slack in my throttle cable.

About the Accufab. Did you lose ant low end? Was acceleration improved? Did it hurt/help your fuel economy?

I purchased the BBK off of ebay. I don't hvae alot of$ into it. I wonder if I need to improve the effceincy of the engine (i.e. Headers) to realize the total gain.

Thank you for your response,

 

>>>About the Accufab. Did you lose ant low end? Was acceleration improved? Did it hurt/help your fuel economy?

Well in order: NO not at all.; YES almost scarey through the gears; From what I can tell nope. I still get 11-12 city and 13+ hwy.

>> I wonder if I need to improve the effceincy of the engine (i.e. Headers) to realize the total gain

You may, I can tell you my truck mods and what has happened.
I first added big tires, yes it hurt performance. I added the headers, not much help. I added a programmer, HEY it woke back up!! Now add in a new TB and FIPK, damn scarey as you hit 55 and shift into third and still climbing hard.


Do you have a chip or a programmer?? Kinda confusing.

 

Thanks Heavy.
No need to reply to email. I am ordering my headers next.

 

Whatever brand you decide on, make sure to get a y-pipe installed as well.

 

Borla, would like the banks, but the extra $300 can go along way.

 

Man, my install was 15 min w/no problems!Idled perfect.

 

Same with mine. I had a problem with the spacer a couple of days later. I slammed the pedal to the floor to pass a blue hair and the spacer flew off, I never did find it. I replaced it with a brass cable splicer from ACE hardware and I havn`t had a problem since. As Heavy said passing at 55 is a thrill now.

 

To update: I dialed in the BBK, very particular about voltage reading from the throtlle positioning sensor(TPS). I was very happy w/ performance and, suprisinglythe economy. My fuel mileage actually increasedby almost a mile per gallon(ALMOST!).

I was pretty happy with the throttle body until a SOB in a suburban tried to cut me off. When he attempted thos my immediate instinct was to accelerate to close the gap. When I attempted this manuever, my truck died.

After climbing underneath the hood, I discovered that the TB shaft had snapped in two. Needless to say I was more than disapointed at this point in time.

If you have read my previous posts on this subject, you will recognize my dilemma. I didn't have a stock TB to put back on my truck. Needless to say, I was scrambling, like a queer eating wieners.

I did remedy the situation, using the best of my Mcgyver skills. I made the stock TB work.

To sum up. I was depending on a larger TB to improve intake air, while the new Doug Thorley headers improved the exit of spent fuel. I have since received an Accufab ctb96-98 tb. A much more quality product than the (POS)BBK. IMHO.

To be truthful, the BBK was purchased used. Although, in my opinion, that shouldn't matter.

 

To update: I dialed in the BBK, very particular about voltage reading from the throtlle positioning sensor(TPS). I was very happy w/ performance and, suprisinglythe economy. My fuel mileage actually increasedby almost a mile per gallon(ALMOST!).

I was pretty happy with the throttle body until a SOB in a suburban tried to cut me off. When he attempted thos my immediate instinct was to accelerate to close the gap. When I attempted this manuever, my truck died.

After climbing underneath the hood, I discovered that the TB shaft had snapped in two. Needless to say I was more than disapointed at this point in time.

If you have read my previous posts on this subject, you will recognize my dilemma. I didn't have a stock TB to put back on my truck. Needless to say, I was scrambling, like a queer eating wieners.

I did remedy the situation, using the best of my Mcgyver skills. I made the stock TB work.

To sum up. I was depending on a larger TB to improve intake air, while the new Doug Thorley headers improved the exit of spent fuel. I have since received an Accufab ctb96-98 tb. A much more quality product than the (POS)BBK. IMHO.

To be truthful, the BBK was purchased used. Although, in my opinion, that shouldn't matter.

 

Do you have your headers on already?

If so tell us about them.

Installation go well? Quality? Performance?

 

No, I haven't rec'd the headers yet. Summitt says the end of the month; Thorley was out of stock-had to make more. I will keep you all posted. I don't think I will take pics of the install, but will definetly post some of the headers themselves.
I really am anticipating getting these babies on!

 

How much does the accufab throttle body cost? If you dont mind me asking. Thank you!

 

I paid $329.00, including shipping,from a vendor on ebay. It wasn't listed on an auction, I contacted him through the sites email. His user name is jtrischler. His email address is the same as his user name @ aol.com.
This was the best price I could find by nearly $15.