I got the TSI kit w/ Apexi SAFC-II for fuel management.

4 Upgraded Fuel injectors.



As soon as I swapped out my injector, I feel better ride on idle and all but after 4rpm.

I got check engine light on. Code is saying misfiring + fuel running too lean.

I thought this will be fixed at the turbo tuning shop but no...

they tried to do everything with safc II but we failed.

Now i believe i need more fuel but 310cc injector is good upto 200 hw.... hmmm...

What do you guys recommend?

Fuel pump? rail? and what's converting to fuel return system? should i get the 5th injector?


Any help!!!!!!!!!!

i suggest you switch to a Fuel return system, so you can regulate the fuel in the rail, and upgraded fuel rail would also help.

Did your dyno guys tune the afc in for each rpm?
And if they did it right it should have thrown a CEL on the dyno if they knew what they were doing.

And if you didnt tune on a dyno thats just all bad.
You need to have a Lambda hooked up so you can see your A/F ratios and tune accordingly.

Were only in San Francisco.
You could drop the car off and have us fix it and tune it in.
" SORRY NO SPONSORSHIPS "

Like Monster said: upgrade the fuel rail and do the Lambda.

converting to a fuel return system has helped other members in the past with that problem. Let us know what you do to remedy the situation.

Definitely go with the bigger rail, fuel pressure regulator, and convert over to a return line setup. The max fuel psi is only gonna be around 52 psi but its better than the stock 45 psi. I take it you are using the TSI kit, so if all else fails, try the extra injectors they supply with the kit. I have the injectors/black box unit used for sale if you didnt get one with your kit. I also have a brand new in the box aeromotive 1:1 for boost fuel pressure regulator. for sale if you wanna convert to the return line setup. I did all this stuff for my turbo setup on the xB and it worked. You should really get rid of the S AFC and get something like Emanage. I had the Camcon but didnt get the greatest results. They werent consistent. Also, change your plugs to something a couple steps colder like a 7 range. Get copper plugs, and gap them to like .025. I hope this helps out a lil bit. You sohuld really check out the mini turbo/supercharger thread at the top of the page and ask questions there cause they will get answered quicker.

Thanks for all the info Simplyscion.

but i have few questions to ask.

1. I am replacing S AFC with E-management, since emanage can boost 50% more fuel control. You think this will solve it or i need more ?

2. trying to get the colder range spark. do you know any site or link where i can get them? how about those on e-bay?
http://cgi.ebay.com/ebaymotors/OBX-Iridium-Spark-Plugs-for-03-06-Toyota-Scion-xA-xB-tC_W0QQcmdZViewItemQQcategoryZ33693QQitemZ8014229192QQrdZ1QQsspagenameZWDVW

http://cgi.ebay.com/ebaymotors/03-06-SCION-XA-XB-NGK-IRIDIUM-IX-SPARK-PLUGS-NOT-TRD_W0QQcmdZViewItemQQcategoryZ33693QQitemZ8013555491QQrdZ1QQsspagenameZWDVW

3. is it necessary to get all fuel pump, and rail? cuz BBist is saying it does not will help that much. Steve said e-management should solve this problem.

4. if not, how much for boost fuel pressure regulator?