87preludea20a3

This is a 2nd gen prelude with an A20A3 SOHC 12 valve engine.Ok well i installed my turbo and piping. I have basically no issues with the fitment. BUT I can't get the car to run well at all... I barelly got it to idle. My boost/vaccum gauge reads the same as when i was N/A(17 vaccum at idle). But when i rev the engine i get nothing but what sounds like backfiring, it will not rev up smoothly. It is just bouncy. i tried to mess with the ignition timing by moving the distributor and rev it up but nothing seemed to help. Another thing, i filled up the tank this morning and now i noticed that there is like an 8th to maybe a 1/16th gone... enough to where i can tell there is less anyway. My whole setup consists of....

-SAFC 2
-wideband air/fuel ratio gauge(aem uego)
-autometer boost/vaccum gauge
-dsm 450 injectors(cleaned and balanced)
-dsm blowoff valve(stock)
-MSD 255lph fuel pump
-adjustable fuel pressure reg(fuel psi is currently at 32)
-fuel pressure gauge(thats how i know above)
-teo4 turbo
-elijahs old old manifold.
-msd 6al box
-msd blaster 2 coil
-ngk plugs/wires

What could be my problem...the sucky thing for me is that i only have one car to drive, so i planned on getting this done in one or two days... It's going on three and still no car. HELP ME OUT HERE!!!!

87preludea20a3

Oh yeah i checked my firing order first, then second i checked compression again... And the only way i could get it to run is to put the SAFC down to -50% on Lo throtle at 1000 RPM at a throttle point of 0%.... does that make sense... And to answer your question NO. I didn't calibrate it at all... Can you help me to do this

Tom-Guy

A20A3 are stout as ****, but I feel bad for you thinking you can DIY a turbo Honduh with no backup transportation.

Set the AFC to -40 across the board lo throttle, and richen it up (-38 to -35 or so) in the higher rpms on the hi throttle. Your ECU is tuned for ~240cc and you have 450cc so you have to draw out a lot of fuel.

Good luck getting it to like boost... the vacuum advanced distributor WILL need to be kicked, but might let you run the AFC hack with good results if you can tweak it to retard under boost - I don't know if you can, YOU need to check that out.

87preludea20a3

Oh duh i forgot about that.. Would you recomend disconnecting that? I can just disconnect that and get a BTM right?

87preludea20a3

I just talked to someone that tunes for a living and he said to try turning down the fuel pressure because the backfiring could be caused by way too much fuel. Also he told me to turn down the SAFC to like 45% to 50% across to like 3000 rpm and then integrat to 0 from there gradually.

Tom-Guy

BTM won't help you if the boost ***** with a vacuum dashpot. BTM won't help you if you disconnect something vital when trying to bypass the vacuum system. Your only recourse is to learn how the ----------er works, and nobody is going to do that for you on a stone age vehicle.

The someone who tunes for a living is an idiot. At no point will you be able to run 0 adjustment on an AFC hacked vehicle without flooding the engine with gas or disabling your ability to read boost via MAP sensor and have the ECU respond. Give me this person's number and I will give them detailed technical information why this is, and they will fist themselves out of shame.

87preludea20a3

Got it running, -50% to -45% at low throttle all the way to 3600 rpm gradually going to 0 by 4500 rpm. Set at -42% to -38% on high throttle all the way to 3600 rpm " " " " ... So it runs great, i got a full 2 1/2 inch exhaust done today and it runs at 13.5 air/fuel on the freeway at 3000 rpm.Oh and its running at 5 lbs of boost and there is no check engine light.