I have a 2gal reservoir, 3/4 lines and a verimax pump. Yes I am spraying meth, have been for 5yrs or so.

 

Something odd to note- seems with the lower intercooler temps I lost a little bit of boost. I didn't really think it was hot enough before for expansion to play a role that much.

Thoughts?

 

Ive saw at 200* IAT a gain of 2 psi but power was down

 

I attached a spreadsheet I made for something else, but it will work in this case. Just replace the word "turbo" with "blower" and its the same haha. Ignore the bottom A2A section and just look at the top and A2W section.

I don't know how much boost you are running, but lets say 12psi. You said you gained 75F in IATs through the run. Lets assume you started at 90F. Assuming 75% efficiency for the blower, so the A2W efficiency has to be about 48% with 100F water as coolant.

So now if you only increase 25F on the same setup, then intercooler efficiency must be about 88% which is very good. Keep in mind this is very simplified since everything chances with time (temperatures, pressures, and efficiencies).

If you lost boost (how much?), then you could get the same result in temperature with 85% intercooler and 10psi boost. So how much boost did you loose exactly, and what were the before and after temperatures?

 

At 189 IAT I was seeing 15.5psi
Now at 99 IAT I am seeing 14.6

 

At cruise they run about 16-20 above ambient, in traffic they will climb to 30 above if I dont have a fan running. Both of the above pulls were on days around 53-56 deg.

 

Yep, that's strictly from the temperature decrease

P2=P1*(T1/T2)^(k-1) (polytropic gas relationship)
P1=15.5
T1=189+459
T2=99+459
K=1.4

So P2=14.6

That's a good thing also...the less boost, the less power the SC needs so you get a double benefit. Keep in mind the airflow is constant though since its set based on the rpm and pulley ratios.

 

What are the ambient temps?

 

I think you just typed a bunch of numbers.......

 

basically