Ok so I,m thinking of some ideas as far as more power & reliability and i want to ask some questions if anyone has the time

Since the water pump seen some results i was thinking of some others not dealing with upgrading the boost!

A Ported throttle body with a bigger opening. will it help with the spool of the turbo or yield more horsepower




The more power you make the more fuel you need to push in the car. But is it possible to leave the 550cc primary's & instead of changing the primary can you just add additional injectors for when the turbo kicks in and leave the primary's for the regular driving?

 

I don't know for sure, but I think quite a few have gone with the additional injector route to stave off 'leaning out'. Seems like one version of the GReddy intake pipe has a provision for an additional injector....

 

/\ yeah but the guy who does my motor said that that isnt a good idea to keep the 550cc primarys & add big additional injectors on top of the big injectors that you already have


ALso ive done some research on throttle bodys. I know that they will help the spool of the turbo (thus more air) but as far as horsepower gains. theres a website where one on a fd made from 406-442hp which is 40 hp more than the regular throttle body


im just open for NA ideas if anyone has any!



P.S.where in the states where can i get a ported throttle body

 

Hmmmm....what are the race guys using? Like the drag cars?

 

I remember a discussion long ago that a ported TB will not gain much at all. Stocker is good enough.

Single turbo is the way to go


Later

 

yeah but more air= quicker spooling turbo

race guys throttle boddy is something you can throw your kids in!

 

Is there a limit then? I mean, surely there must be SOME disadvantage or else cars would have trash-barrel sized TBs. I mean hell...I've a friend with a NA
fuel injected Mercruiser 502 cid engine in his boat and that TB is pretty small, like a 4 X 6 opening if that? On a 502....

 

And why not? Just because HE has trouble with injector staging and transition doesn't mean it isn't "a good idea".....

-J

 

most that I' ve seen limit on the size of the exhaust ports, the exhaust ports are 60% the size of the throttle body. but also if you go bigger ( i mean huge like your speaking of) then a lot will have to be redone for that extra airflow to flow evenly with everything. so yes its possible but a lot of other work will need to be addressed like the manifold



When i got the 850cc primary with the modified fuel rail and 1600cc for the secondary injectors i was talking with him and hes telling me that its already enough fuel to support the power i want (600hp) but i dont think he undestands that im only keeping the 550cc for mpg.

question internal comsucktion. at what point does the computer start using the secondary injectors?

 

That depends on your tuner, tps % and load.....But usually around 3k.

-J

 

If you get the FJO injector driver, you can run 850cc primaries and not effect your fuel mileage if its tuned properly. Also, with negative lag without the FJO driver, some tuners have been able to reach similiar results. MPG is all in the tuning, not the size of your injector.

thewird

 

/\ thanks i was wondering about that! cause i have 550cc & 1600cc but i have 850cc with the primary rail waiting to install and its a daily driver that i have so i have to do more than youguys

 

600whp is a stretch with 550s..throw in the 850s. i hear like 480..tops 500whp is the limit of the 550/1600 combo

 

thanks, ill keep you updated, (i just bought 850cc with modified rail)

 

this fjo peak and hold driver is worth every penny

 

I run 850 primaries with rock solid idle at 900rpm only with the PFC and I still use the ISC. I do admit though that it took me a bit of time messing with the TB adjustments including the air bleed screw to get it right.