ryan2l

Well if you have no cat it will smell rich sitting there at idle. And with a stock fuel system shouldn't you expect to be running lean with any type of boost? Look into some ford injectors I know they work for the 4.0 strokers not sure if they will work in yours. Maybe a FMU or something.

wckdyj

Have a 3:1 fmu but I start cutting out before I get into boost so I am not even getting to the point that the fmu will raise the fuel pressure. The only reason that I have an FMU is because I cant find anyone to program my computer.

As far as the injectors...I only have 1 in the tbi and finding a higher flow injector has be tough.

I have made an adjustable MAP sensor that I can raise the A/F ratio a little at a time but the more I raise the voltage the less drivable the thing is. I have the voltage at 5.5v (normal being around 5v) and it cuts out at even the lightest throttle under load. Which is what was making me think it was getting to much fuel from the start.

I need to get some premium gas today and check my plugs. Maybe gap them down to .28 instead of .35. Maybe the spark is getting blown when the boost starts to climb.

Will update later.

wckdyj

OK, update with pictures.

first a picture of the entire setup with the new smaller vw/audi .48 turbine, greddy bov.



Next a pic of the wastegate. Hoping that someone has some info on it. It is dual port with no actuator. Any info would be great.



And just since some asked for them, here are two more pictures of the rig. Its not much, but it does the job.




Now for some questions....I am still cutting out at higher rpms. I am waiting on my wideband to really tell if I am running out of fuel, but I am also not really building any boost. It will go to 5psi sometimes but not all of the time. Also it seems that I am getting some fluttering from the turbine around 3600-3800rpms. This also the same time that its cutting out.

Would I really being sending pressure back to the turbine wheel if I am still on the throttle? I can here the BOV releasing the pressure when I let off the throttle but I still hear the chatter from the turbo.

Last question....What would be the causes of a turbo this small on a engine with a decent displacement(2.5L) to spool so slow? I dont even hear it start to spin until almost 3K rpms. I have gone over the entire setup and there arent any boost or exhaust leaks.

Thanks,

chris

wickedpumpkin

Nice setup man

rprznt

check plug gap, install new plugs, check timing, get some management, post pics of the manifold and turbo setup - up close please.
why don't you just clock the comp housing around, and it'll have a straight shot at the intake mani- remove extra-long bendy pipe? this cannot hurt spool times either....

Rob the plumber

I rotated my compressor housing around to make it cleaner to plumb. I also had to rotate the cartridge so the oil feed line points up. Still waiting on my intercooler too. Mine also spools very quickly too, like 5 psi @ 1200 rpm. so I am thinking you definitely have issues. Do you run a check valve to your MAP sensor? I heard they tend to fail without a check valve. I don't have one on mine, but I just put mine together two days ago.

wckdyj

Plugs are new and gap is set at .030. The compressor is where it is because I am planning on a intercooler in front of the radiator. I will try it though, cant hurt. I will post the results.

As for management, I kind find any for my engine outside of a full standalone kit.

Rob,

Saw your post when I did a google search. Setup looks good. I do have a check in the MAP and also built an adjustable map to fine tune the fuel curve. I wonder if yours is spooling so fast because of the water cooled center section?

On a side note, what is the part # for the colder plugs that you used? (saw it in your thread on another website).

Thanks for all the input.

Rob the plumber

I'll check on the plugs tomorrow. What do you have for a check valve on the MAP sensor? I ave been running mine without one, and now it is running like it was the last time it had a bad map sensor.

wckdyj

I just have a vacuum T in line with the MAP. Like this.

------------------------------T------------------------------------
I
check valve

Let me know on the plugs.

chris

Rob the plumber

The plugs I have are Autolite 3924's. The guy at the parts store said that they were one range colder than stock.

I have another question for you. I think my engine may have some considerable blow-by. While idling, if I remove the oil fill cap there is a decent amount of air blowing out of there. Could you possibly check to see if yours is blowing out as well? I think I might try to remove the oil pan, and replace the rings from the bottom if I can. I just don't know if I will be able to slide the rod and piston out with the crank still in there.

Thanks,
Rob