??? on installing turbo drive pressure gauge

[JStieger]

I'm going to hook up channel 2 of my SPA gauge to monitor turbo drive pressure. Is 6 feet of coiled copper tubing between the manifold and pressure sender enough of a buffer for cooling to protect the sender?



-Thanks-

 

[Fishin Guide]

I believe that some have run even less than that. I would be curious as well. I think some have used the copper to nylon pressure tubing. So, there must be a large heat dissapation present.



Dave

 

[JStieger]

I believe that some have run even less than that. I would be curious as well. I think some have used the copper to nylon pressure tubing. So, there must be a large heat dissapation present.



Dave

Thanks! I'll give it a try. I reread my SPA instructions and it said max sensor temp was 300* F for brass (mine is steel) so if people are running through copper tubing and then nylon tubing, then I should be OK. I'm heading to Meridian, Idaho this Friday and booked about 1 hour dyno time so I want to see if I get some improvement with my SPS66 over this (smoky HTB2 62/14). Stay tuned for a SPS66 drive versus boost pressure graph...

 

[Mhannink]

ok whats the diff between drive pressure and boost pressure why need 2 guages

 

[Fishin Guide]

Thanks! I'll give it a try. I reread my SPA instructions and it said max sensor temp was 300* F for brass (mine is steel) so if people are running through copper tubing and then nylon tubing, then I should be OK. I'm heading to Meridian, Idaho this Friday and booked about 1 hour dyno time so I want to see if I get some improvement with my SPS66 over this (smoky HTB2 62/14). Stay tuned for a SPS66 drive versus boost pressure graph...

Thank you!! We'll finally get to see some numbers!



Dave

 

[nickleinonen]

ok whats the diff between drive pressure and boost pressure why need 2 guages

drive pressure is the exhaust pressure driving the turbine [so a pressure measurement pre turbo turbine like where a pre turbo pyrometer would go]

boost pressure is the intake side pressure



i am though not sure about what the relation between drive pressure and boost pressure should be [i guess it depends on which turbo you have and what size turbine housing you have]

 

[Fishin Guide]

Ideally, we want a 1:1 ratio for drive pressure to boost.



It is a measure of effenciency and will give some insight to the characteristics of the turbo.



Dave

 

[SRadke]

1:1 or less. More boost than drive is ideal at load.

 

[JStieger]

After about 2 weeks - here's some installation pictures. I used 6' of 1/8 gauge tubing that can be bought from any auto parts store and left it coiled to dissipate heat. I actually did some really hard runs and then popped the hood and I could set my hand on the copper tubing without major discomfort. The first 2 are different angles showing the tap off the manifold. The 3rd picture shows the rail pressure at 5,520 psi and drive pressure at 2 psi when my high idle @ 1,000 rpm kicked in.