54 replies to this topic

[Jcbkid]

Hey guys I picked up a t5 Ecu from an 850 Turbo at the junk yard today

Having some problems:
I was told with it in I'd boost at or around 10psi I definitely feel alot more power and no lag but I'm still only boosting at 7psi vs my previous 5 psi I'm not getting any cels and it starts right up. It did start vibrating a little but that could have always happened since I have a bad top motor mount and leaking PS pump

[Jcbkid]

Update

It holds boost pressure at 4psi then down shifts where as before it would down shift right at 1psi and I'm getting better MPG? Weird

[Yellow95]

If you are running it in a 97 GLT then enjoy. No issues at all. If you are running it in a 98 X70 GLT, take it out or dont use your air conditioner. Gary

[MattyXXL]

It's been a while since I ran a stock t5 ecu, someone correct me if I'm wrong but isn't stock t5 set to 7.5 or something like that? And the R was 10?
If that's how it is then your right on target.

[Yellow95]

Supposed to be 9lbs but his turbo could be tires, his wastegate could need adjusting. His CBV could be torn. Should I go on? Oh and his boost gauge could be off.

[Jcbkid]

mines off by 1psi. its now boosting normally again around 7-9! Why can i not use my ac? So far it runs mint!

[MattyXXL]

Supposed to be 9lbs but his turbo could be tires, his wastegate could need adjusting. His CBV could be torn. Should I go on? Oh and his boost gauge could be off.

With you 100% on that...

mines off by 1psi.

Id get a new gauge..

[burnout8488]

You need to tell us if you put it in an 850 or S70.

[Jcbkid]

Its in a v70xc

Found that my fuel pump takes a little longer to go up to pressure when key is on and when i shut the car off it hisses from air vents. So far though running wise its mint.

[MattyXXL]

what car did the ecu come from?

[Jcbkid]

ecu came from an 850 t-5 i checked the serial number on the ecu and it is a t-5

[RobT5.]

Go ahead and remove that ecu for right now....


850 ecu in a 70 series is not a good idea...
Lets just say your ac compressor will no longer like you...

ask the PO of my car how I know...
tuned 850 ecu in the 70. <3 ya billard.

[Jardim]

Keep the AC off you should be straight. My ac stuff the bed ages ago so this isnt a problem for me.

[MattyXXL]

Its in a v70xc

Found that my fuel pump takes a little longer to go up to pressure when key is on

Could this be happening due to the 850 ecu being M4.3?

[Jardim]

Could this be happening due to the 850 ecu being M4.3?

They say M.4.4 starts the car faster than M4.3 so maybe.......I wouldnt downgrade from 4.4 > 4.3 though, i thought it was the other way around...

[MattyXXL]

Same thoughts here...

[Yellow95]

The ac pinout is dfferent and it will do dastardly things to your ac. Other then that it will run fine.

Gary

[Gideon35T]

There's a million things that can cause boost pressure issues. However, I bet that at least a portion of the issue is with the boost gauge. Most boost gauges are not calibrated. They are just a rough guess. Beyond that, the motor is 15 years old, stock intercooler piping couplers are rubber and don't last, CBV could be damaged, wastegate tired and/or needs adjusting, turbo could be tired, boost leaks of all different types, etc etc etc. If it's faster and you've done a good stage zero then just be happy. As for the ac, I seam to remember a thread where someone rewired things so the ac was fine. I wonder if Lucky could chime in on the ac wiring difference as I'm sure it's within the serial bus and may be able to be adjusted just via tuning.

[Jcbkid]

Honestly I'm doing an AC delete anyway so I'm not worried I have done stage zero so I'm very happy!

[Keaton85]

AC delete: do you plan on ever reselling this vehicle? if so then I would shy against that!