im wanting to know what the stock fuel injector size is. what injectors from othere cars fit directly into the xb, and the sizes of these injectors that fit. thanks for the help.

 

The stock ones are rated at about 210-230. You can swap them with the celica, I believe the GTS, 310. Maybe you can check out the tC's injectors, they are around the 370. But I am not for sure they will fit.
Make sure your pump is up to task for the added fuel supply needed for you bigger injectors.

Why do you need bigger injectors, forced induction?

 

im going bigger because im running a turbo and im on stock fuel as of now im trying to find a set of 300cc injectors but iv been told a few things about injectors that alot of you may not know. i found that the cc rating on injectors is rated a psi some injectors are rated there cc at say 30psi when otheres are rated at say 50psi well basicaly if the injectors on a celica are rated at 310 at 40psi and you put them in a xb that runs 55psi of fuel there more like 350cc injectors. so i was told to try and find out the psi thaere rated at the cc there claming to makesure im not over fueling the car. also i talked to rc injectors and thay also told me that ones you hit 12-12.5 a/f that you should raise injector size by 20cc for every lb of boost extra and it should keep you in the same a/f but if you go any more then 50-70 cc over stock and have no way of pulling fuel at lowend its will itel rough or may not even idel. wich iv been told that the celica injectors will make the car idel like crap or not even idel and if there 310cc that would be 80cc over stock.

 

Rollhard is running 310 on his xb turbo, but I am not sure about his idle.
Yes it's true, the higher the pressure the more they flow and yes, some do list their's at 30 psi, 45psi or more.
I wouldn't be changing injectors without a fuel management to compensate for the change.
When I was racing my eclipse gsx and I swapped the injectors, I had to re-tune my apex'i S-AFC to compensate for the bigger injectors.
You also said "it should keep you in the same A/F range", but that's not a forsure. You might still be running leaner or richer, every condition is different. I wouldn't base my injector choice just on "for every lb of boost raise your injector choice by 20cc to maintain the same a/f".
I don't want to upset you, but that's my opinion. If you have a fuel management in any form, even when you are running "too" big (350cc for example) of an injector you still can adjust for that.
For example: with the eclipse GSX with most basic upgrades and a 16g or big T28 turbo, you should be running 550cc injectors, some did and some went even bigger like 650cc or 680cc. They just had to lower their fuel adjustment compare to the ones with 550cc.
I hope this will help. If you have any other question let me know. And I don't want to flame you in any way. This is just my $.02.

 

yes i understand il need some sort of fuel computer but is it true that the stcok ecu retunes it self if your using a piggyback computer like a safc or is that just a myth. also isnt there a company that has a piggybac that also alows ajustment to the vvti.

 

Yes, it seems that the ecu is compensating after driving some miles and it's almost makes the changes of the piggyback worthless.
The best results were with the greddy e-manage, power enterprises cam-con and stand alone.

The one you are referring to is the power enterprises. See link below.
http://www.powerenterpriseusa.net/pr...con/camcon.htm

I am also still researching what the best sollution is for piggyback / fuel managment.

 

we sell plug and play 370cc 410cc 550cc get an emanage to pull the fuel out at idle then you will not have to worry about it

 

but what about the readjustment of the ecu? Will we then be (as i think rollhard found to be)forced to reset the ecu every 30-45 mins.