Twin turbos and air intake temps?

[jbolt]

Is there a formula to calculate the air exit temps for a twin turbo setup? I’ve installed a probe in my air horn and I’m going to put another one in the secondary outlet elbow this weekend so I can get an idea of the intercooler efficiency.



I’m running an HY35/BHT3E. I realize I’m under fueled now but with only the Lucas injectors (fuel pump stock), aFe 4-1/2” intake and 4” exhaust I can hit 40psi pretty easy, maybe more but I’m going pretty fast by then so I’ve been backing out of it. With a sustained 30psi run I’ve only hit air intake temps at the horn of 150 (ambient being 75). Seems kind of low to me but I have checked the thermocouple and it is accurate +- 1, reaction time is 1-2 seconds.



Thanks,



Jay

 

[Diesel Freak]

you are prolly close to 450F at the inlet of the CAC

 

[Diesel Freak]

something I figured up a while back.



With both turbos running at a PR of 2. 36, peak boost will be 67 psi!



secondary turbo discharge temperature would be 600F assuming 100F primary inlet temp, overall efficiency of 70%, and one ATM inlet pressure.



If I drop seccondary inlet temp to 60F Boost temp drops to 524F



That temperature seems high, but it really is not... . if I were just running a single turbo... . well, it would be impossible now wouldn't it.

 

[Jim Fulmer]

J-bolt..... 400 degrees after the turbo's at 50 psi and 120 at the hat with no water, I monitor air temps allot!



Jim

 

[jbolt]

Hey thanks DF and Jim. It's a whole different animal with the twins even being under fueled.



Jim- what are you using to monitor air temps?



Jay

 

[Jim Fulmer]

Autometer with a Memory recall for the highest temp... . two probes!



Jim