Time to go stage II with A/C!

[kidglok]

norbs how did you calibrate the sensor??

 

[norbs]

Norbs, I would find a way to decrease that oil pressure, or get ready for lots of oil leaks in your near future. 40 at hot idle is too much in my opinion. That's what I get when I cruise around on the street at 2500rpm. With your pressure, every time you want to drive your car, you have to let it warm up 10-15 min before driving it..........

I will see what I can do with it, the oil is ruined I don;t want to run it any more until I change it.

 

[norbs]

norbs how did you calibrate the sensor??

I measured the voltage against a gauge at 100 psi and did all the calcs...

Just finishing up the intake piping.

 

[norbs]

Seems I can;t get it the boost up, and oil psi down....everything works backwards for me........................

 

[turbobitt]

Seems I can;t get it the boost up, and oil psi down....everything works backwards for me........................

Sounds like your car needs some Viagra...

What do you think your boost problem is from?
Converter to tight, wastegate stuck open??
AG

 

[norbs]

Sounds like your car needs some Viagra...

What do you think your boost problem is from?
Converter to tight, wastegate stuck open??
AG

I really think its an excessive backpressure issue, I need to put a bung in to log it. I have the heavy spring in the gate now, I guess I have to add the 2nd spring next. Right now I have the boost duty cycle set to 0% I am trying to find Min boost..I'm still dialing in the VE table so the correction is still all over.

 

[kidglok]

Why is the fuel pressure 78 when the boost is 5?

 

[turbobitt]

I really think its an excessive backpressure issue, I need to put a bung in to log it. I have the heavy spring in the gate now, I guess I have to add the 2nd spring next. Right now I have the boost duty cycle set to 0% I am trying to find Min boost..I'm still dialing in the VE table so the correction is still all over.

I would check for potential wastegate leak or if its stuck open for some reason. Maybe some welding slag or something holding it open.
Allan G.

 

[norbs]

Why is the fuel pressure 78 when the boost is 5?

Good catch, I think I messed up the sensor calibration, when I was setting up the oil psi sensor. Back on the topic of oil psi, can someone please explain this statement in the power source book......
shim the oil pressure spring to provide 80 psi @2500 rpm at 120F..

 

[norbs]

I would check for potential wastegate leak or if its stuck open for some reason. Maybe some welding slag or something holding it open.
Allan G.

I will have a look at it today, does seem odd the spring I put in is at least 3x the pressure I took out, I wish I would have measured backpressure, then could see more what is going on..

 

[turbobitt]

I will have a look at it today, does seem odd the spring I put in is at least 3x the pressure I took out, I wish I would have measured backpressure, then could see more what is going on..

Something odd going on. That is why I suggested an internal leak. You never know but sometimes worth checking before you pull your hair out looking elsewhere. If your wastegate dump is easy to dissconnect then maybe easier to look for exhaust flow at idle.
Allan G.

 

[HighPSI]

Are you saying your backpressure is so high at 5 psi it is opening the WG? I find that very hard to believe. During spoolup the backpressure will climb a little while the wheel is being accelerated, but not that high. What turbo are you running, what size WG and what spring? You are the "king" of unique problems

 

[turbobitt]

Don't dwell to much on the high oil pressure. Mine is like that or even more when I use new 20w-50 oil and it is very cold still. Even in the summer months it will start out very high and eventually idle at about 20 psi.
Allan G.

 

[norbs]

Are you saying your backpressure is so high at 5 psi it is opening the WG? I find that very hard to believe. During spoolup the backpressure will climb a little while the wheel is being accelerated, but not that high. What turbo are you running, what size WG and what spring? You are the "king" of unique problems

The turbo is a garett gtxr4202 76.1 mm wheel with a 1.01 housing, the gate is a JGS 50MM gate with the single heavy spring, the light spring gave me 2 psi the heavy is giving me 5.5 psi...I am going to add the 2nd smaller inner spring to the gate. I still have more problems, I need to put a scope on the input voltage to the XFI, I am getting random data stream loss now.

 

[kidglok]

Maybe it's the 1.01 housing?

 

[norbs]

Maybe it's the 1.01 housing?

It could be the quickspool valve now has changed that 1.01 to .5 ish? Lets do some quick math. the gate has a surface area of 3.14 sq inches, so to hold back 1 psi we would need 3 psi spring, it felt about 25 psi force to push the gate spring in, if we had 8 psi backpressure at 5 psi boost, I would seem about right. I put the 2 springs in , I needed help from a neighbour to install it or I would have never got it together, unless I would have to use my foot and stand on top of it. I could not see any evidence of the valve leaking on the seat.

 

[norbs]

Got the dual springs in, now it looks like I need more spring, I put the dual with the light spring, I think I need the with medium spring, should give me 2 lbs more or so. Fuel psi has been re-calculated, but I think its still off, I assumed 4.5 v = 100 psi but without a gauge on it I don;t trust it...

 

[turbobitt]

It could be the quickspool valve now has changed that 1.01 to .5 ish? Lets do some quick math. the gate has a surface area of 3.14 sq inches, so to hold back 1 psi we would need 3 psi spring, it felt about 25 psi force to push the gate spring in, if we had 8 psi backpressure at 5 psi boost, I would seem about right. I put the 2 springs in , I needed help from a neighbour to install it or I would have never got it together, unless I would have to use my foot and stand on top of it. I could not see any evidence of the valve leaking on the seat.

Don't forget that there is boost pressure reference on the back side of the diaphram if you hooked it up that way. Makes it open sooner than just back pressure alone acting against the valve. So two factors to consider.
Allan G.

 

[Alky V6]

How is the plumbing to your wastegate set up? What sort of boost control system are you using?

 

[norbs]

How is the plumbing to your wastegate set up? What sort of boost control system are you using?

I am using the fast xfi boost control with a 4 port solenoid, with open loop duty cycle, based on the numbers I put in for now, Right now the duty cycle is set to 0%. It is plumbed as the 4 port diagram shows.