Outer Limits 4x4 Board

Hi all,

i am preparing to put a turbo on my 2.6 paj, i have already don the efi conversion which works well, I am using the stock magna computer and from what i've read on various other posts this will be fine for up to about 5-6 psi.
But my question is where should i place the Air flow meter?

Should it be where the air first enters through the snorkel where it is now or closer to the inlet point after the intercooler and turbo?

Thanks in advance for your help.

Without fully understanding the operation of the air flow meter, I would say there's a risk that it won't read airflow properly under boost conditions - so I would say the safe bet is to place the meter upstream of the turbo, to "read" uncompressed air.

At 5-6psi you should be safe, but I'd be interested to find out how well the stock afm reads flows above those achievable by a standard N/A 2.6. Are you sure the stock afm won't max out at high revs/boost?

hi oldm8,

do you have a thread of your carb to efi coversion? I too have a
carb 2.6L. Im thinking of converting it to efi. Was there an improvement
in torque and power? How about fuel consumption? Tia

You must place the AFM before the turbo. I'm not so sure that the stock ecu can compensate well even at 6 psi. Do not make the common mistake to see just the numbers. For example, 6psi pressure with a small turbo maybe is ok, but with a GT35 is a recipe for a disaster . Some people increase the fuel pressure from the fuel pressure regulator to match the increased needs for fuel. But is the mixture ok? In any engine load? Apart from the fuel problem even bigger is the problem of the ignition's advance timing. Lowering this from the distributor many times is not enough. My recommentation is simple. If you want something perfectly tuned and also trouble free, consider puting an programmable ECU. Believe me, it's worth it. You can have some serious boost (over 6 psi, things are interesting ) and can get rid of the AFM and put a map sensor wich is simpler and with no problems.

Thanks guys for your input.

Scott, i have no idea wether the AFM will max out or not, i guess i can give it a shot, test it out. I didn't fully record the EFI conversion though i may start a thread once i sort out all the gear and the path i want to head down.

Constapa, I was trying to save a bit of coin by resisting the programmable ecu but its looks more and more inevitable the further i go with this.

i have sourced a used t04 turbo of a 1.8ltr mitsu 4g64? along with the intercooler and pipes etc, i have also ordered a cast manifold from a place in the states who sent me the wrong one in the first instance so i am waiting on the replacement one.

Anything else you guys can think of that i might need to cover before i begin?

Thanks again.

Shane

monmendoza, i did the efi conversion cause i got sick and tired of servicing/tunig the complicated carby.

The main benefits are instant throttle response and slightly better fuel consumption.

If the torque and power are better i haven't noticed but it is certainly not any worse.

i followed a post on sigma-galant.com fo rthe efi conversion.

You should check it out.

Shane

oldm8 wrote: Constapa, I was trying to save a bit of coin by resisting the programmable ecu but its looks more and more inevitable the further i go with this.

i have sourced a used t04 turbo of a 1.8ltr mitsu 4g64? along with the intercooler and pipes etc, i have also ordered a cast manifold from a place in the states who sent me the wrong one in the first instance so i am waiting on the replacement one.

I fully understand the coin saving idea but believe me this is not the case. I 've passed all the tuning process and then i realized that any other way to put a turbo depends on luck... This is the proper way to do it. Wait a little (for the extra coins ) and do the things right. Peace of mind is more valuable.
Also, DO NOT touch the compression. It's fine as it is. The trick is to make the car as linear as it gets ( in the transition from normal to turbo state) and for this you need -among other things- to retain the 8:1 factory copmression. Note, that with a programmale ecu you can have 14 psi of pressure on stock pistons (hehehe... ) with a turbo capable of 180-200 PS. I believe yours is something like that. (Mine is from a 1.8L engine). Also do not forget the exaust. You need a new one...
Cheers.