A throttle body from a BB truck ... i.e. a TBI with 51 mm bore ... and 80 or 90 lbs/hour flow .. would it be a bolt on .. straight .. to a stock intake manifold for the L03 engine ? .. AND .. can one change out the injectors from the 80 or 90 .. to say hmmm 55 lbs/hour ones from the SB pickup ?

 

https://www.thirdgen.org/techbb2/sho...hreadid=205713

That was from the sticky at the top of the page.

Quick answer: No it is not a direct bolt in.

 

No. The bolt-pattern is the same on sbc TBI and bbc TBI so it will bolt up, but the factory sbc intake has bores sized for the smaller sbc TBI so the throttle blades won't open all the way. You will need to bore the manifold bore out to the larger size, and yes, it has been done before.

The BBC injectors will work, that's also been done, and they'll also fit into the sbc TBI but if you do that the engine will run waaaay too rich because you don't have a 454. So you will need to reprogram the injector constant within the EPROM (the chip) of the ECM. If you don't know how to do this, you need to read at lot on the DIY ECM board here at TGO.

Yes, but then again if the ECM (chip) you have was expecting something other than 55 lb/hr, then you'll need to change the injector constant.

 

It would fit, and you could make the motor run well with it, but its too large for an L03. Youll find that itll make the motor harder to control since youll be at WOT by the time the gas pedal is only half way down to the floor.

 

and getting the accelleration enrichment in line(tuned), (aka. pumpshot) will be a nightmare.

 

So what's my best option otherwise .... bore out the current TBI just slightly ?

 

or keep the stock one.

judging by the list of modifications in your sig, I don't see a need for a bigger one.

 

How far can the current injectors support it all ... because I'm in the process of designing a big ram air scoop intake (using parts from Home Depot lol so yeah not real small) ... will the current injectors still be ok.. or any chance I may run too lean ?


Speaking of which.. fuel ... hmmm may have to do a fuel filter replacement this weekend ... for some reason the car started running sluggish after I was down on almost no gas.. filled up the tank full ... (put in a fuel injector spacer yesterday.. doubt that would have anything to do with it) ... and well... it stalled on me in a parking lot ...


It hmmm let me describe it hmmm ok ... runs a little bit sluggish at very very low speed.. at almost no throttle.. there's like a "gap" ... where the car takes a "break" and then goes forward... so something is getting clogged


How much do shops usually charge for cleaning fuel injectors ?


The car supposedly got Fuel Service.. and Transmission Service hmmm 6000-7000 miles ago... but .. hmmm

 

You will be fine with stock injectors, its not going to add that much more air. I know for a fact the stock injectors and regulator can support over 200rwhp.

as for your hesitation, i would hook up a fuel pressure gauge, and go drive it, i bet we see your fuel pressure drop when you mash the loud pedal.

 

OK... tried it again today....

Once I got home I decided to do a quick investigation .. regarding the problems

It seems like the car's idling pretty good in Park ... when ya switch to Reverse .. or Overdrive (possible Drive as well, but since one moves through OD .. well.. shrugs) ... the idle becomes more rough

It was actually worse after the car had been parked for quite a few hours at work

Do I lack a bit of power uhmmmm well... yes a little bit I think so


So.. suggestions ?


Fuel pressure ... vacuum leak .. throttle position sensor .. idle control ??


It drives ok once out on the road ... but it does feel like a tiny bit less power than usual ... now I doubt the fuel injector spacer would have anything to do with it

 

If it is doing funky things at idle, i would look at a vacume leak first. As check your timing, make sure it hasn't slipped.

 

I'll replace all the vacuum lines tomorrow ....

damn it lol.. did it again... clicked new topic rather than reply lol .... my reply to this one was called.. timing .. hmm something lol