Here my my data plot of of my direct replacement ICs using still stock hoses... not 2.5" OD piping like on others....

A friend did the plot as i am not Excel savvy... the runs were from 0 to 250km... an 18g car running 1.1 to 1.2bar boost.... the stock IC run was done in -2.25 Celsius or 28 degree F.... the 911tuning ICs were done in 0 Celsius or 32 degree F...
same car, same tune, same boost..... nothing else changed...
I also can make them with 2.5" OD piping as in other popular after market units... we probably will see even better results....

 

nice..

 

Great data. The only problem is that you don't start at the same or near to the same temperature so the delta is compromised. If you look at the temperature differential, it actually appears as if the stock ICs do a better job at keeping the heat at bay. We both know that isn't true

I will try to post a compiled data graph as well but it just takes forever to put it on paper, and I will be in the dyno all day tuning a car

Justin

 

Justin what if the 4.5inch IC's did not allow the starting temp to get as high as the stock starting temp?

I see what you are talking about the delta of the 2 coolers.It does look like the stockers are maintaining a smaller delta.

 

That's the other problem....

maybe wait on the side of the road for 20 minutes blowing into the stock IC's? Technically, you could simulate almost the same starting temperature, but it would just require some creativity. Who wants to put stock ICs back on their car to test? Certainly not me For reference though.... in cruise with my stock intercoolers, no boost, they are within 3-4F of the 4.5 inchers. When you step on it is when you see the BIG differences.

Justin

 

Hello Justin. I compiled the data for Mark.

The two cars were run on different days, with a temperature difference of 2.25C. Both runs went from 0-~250 km/h. When you pick data points compare, you need find points of commonality. I chose the very end of the run...at WOT in what I am assuming is 4th gear. There wasn't enough common points to plot a full run in comparison.

Other points. The starting IAT at 0 km/h for the stock ICs is 12.8C...despite a 2.25C advantage in ambient temperature over Mark's 3.5in ICs (which was 6.8C.) This difference of 3.75C at the begining of the run can not explain the difference at WOT at the end of the run.

 

Paulie,

The delta that you and Justin are referring may be an artifact due to the limit data points in commonality. I could not compile data from say 3000RPM and up there were not enough data points in common. Hence the slope (or delta as you are referring to) may be off...we just can't tell from these two runs.

However, what IS evident, is a overall difference in temperature from one run to the other...a near 18F difference at WOT.

 

Here is a comparison plot using km/hr as the indicator (x axis.) Because of the very cold ambient temperatures, I'm not sure if the two runs are adequate to demonstrate heat soak characteristics.

 

FWIW, 10C delta = 18F delta

 

WOT temperature for stock IC max temperature = 40.55C
WOT temperature for 3.5in IC max temperature = 30.8C

DOOOOH....my mistake. Corrected!

corrected: 18F

 

Difference = delta.

40.55C = 105F
30.8C = 87.44F

105F-87.44F= ~18F

Note that I don't mean to suggest that these intercoolers aren't doing much -pressure drop across the core is probably substantially lower & I think you'd see massive gains after repeated pulls.

 

DOH!

 

I understand completely. First off, it's hard enough to find a place to even do a 0-250kph run

I was just getting back to the basics as when I was tuning my car with the standalone it made a big difference as to where the run began(temperature wise). Granted this was with very little airflow and why when I posted the comparo I gave back to back hot comparisons. Then the runs started with about the same 100F+ ambient temps(sucks to be in Texas, huh? )

I understand that the temps are definitely lower .... that's a given. I was just pointing out that to see the differential between the two given a close to equal starting point would have been nice. I am sure that his aftermarket IC's would show a large difference, and a smaller increase in temps from the beginning of the run until the end. I have tons of runs on the dyno with data, but not so many on the street(call me a wuss).

It's definitely great data and reinforces the need for intercoolers at almost any level... Thanks for compiling and graphing it

Justin

 

It took me a week... it was hard... getting it done in Chicago temps... and on closed circuit roads... I have a handful of other runs.... mostly 4th gear... the temp differences are even greater as I repeatedly stopped on it....
This was on 18gs at 1.2 bar peak....
The 4.5s on on another car... That one will be even more interesting.... but they are not direct replacement... and these are with the 2.5" piping vs stock 1.8" ID inlet hoses...
mark

 

No worries ! great thread