intercooler test
#271
I think you are confused, thats not how you measure efficiency. In fact im not sure what its measures.
By your logic if ambient temperature were 2 C and the post intercooler temps were 3 C, we could say its gone up by 50% lol
The correct way to measure intercooler thermal efficiency is thus
(Intercooler temp input - Intercooler temp output ) / ( Intercooler temp input - ambient temp) =
(138 - 32.5) / (138 - 21) = 90%
By your logic if ambient temperature were 2 C and the post intercooler temps were 3 C, we could say its gone up by 50% lol
The correct way to measure intercooler thermal efficiency is thus
(Intercooler temp input - Intercooler temp output ) / ( Intercooler temp input - ambient temp) =
(138 - 32.5) / (138 - 21) = 90%
#273
Scooby Regular
um 50% because the difference of 10 degrees (30-20, i rounded it) is 50% of the initial figure of 20.
the higher the inlet temps go the more power you loose. the temp change shows that inlet temps have gone up by 50%, so power loss, due to temps will be 50% greater than the first pics. But 50% is not 50% power loss, its just 50% additional loss through thermal expansion of air. i can't remember what the figure is for bhp loss for degrees C increase in inlet temps off the top of my head.
the higher the inlet temps go the more power you loose. the temp change shows that inlet temps have gone up by 50%, so power loss, due to temps will be 50% greater than the first pics. But 50% is not 50% power loss, its just 50% additional loss through thermal expansion of air. i can't remember what the figure is for bhp loss for degrees C increase in inlet temps off the top of my head.
#276
To quote Harvey
In this case if you just measured % gains on the movement of air temps on a good fmic you could say 37-75% - which of course is nonsense.
Rather than worry about efficiency its more important to measure the amount degrees over ambient.
According to the above a good FMIC does 6-12 degrees over ambient @ WOT.
My test shows in this case 11.5 degrees over ambient. So not quite as good as a FMIC but pretty close.
It helps this test was done on the road to get real world airflow thru the tmic and i run a big scoop.
I hope to do some more tests with a watersprayer.
The objective is to get the air entering the inlet manifold at the throttle body as close to ambient temperature as possible.With an efficient front mount that temperature will typically be 6-12 degrees over ambient so let us assume your in car temperature guage is showing 16 degrees then you could expect to see 22-28 degrees on your ACT guage.
We normally refer to air charge temperatures as "X" degrees over the ambient.
According to the above a good FMIC does 6-12 degrees over ambient @ WOT.
My test shows in this case 11.5 degrees over ambient. So not quite as good as a FMIC but pretty close.
It helps this test was done on the road to get real world airflow thru the tmic and i run a big scoop.
I hope to do some more tests with a watersprayer.
Last edited by typeRv4; 11 November 2010 at 02:26 AM. Reason: added WOT
#279
Retested the same classic hyperflow top mount with waterspray.
Left is air temp before the airbox, right is exiting the intercooler.
1.7bar peak - md321. Test on exactly the same road.
Temperature increase over ambient 7.1C,
not bad for a top mount
Last edited by typeRv4; 11 November 2010 at 02:27 AM.
#282
Scooby Regular
#283
Scooby Regular
Join Date: Apr 2003
Location: South Bucks
Posts: 3,213
Likes: 0
Received 0 Likes
on
0 Posts
Thread
Thread Starter
Forum
Replies
Last Post
Flat4x4-again
General Technical
2
29 September 2015 06:32 PM
coreuk, flow, fmic, forester, gdb, gt2, guages, hdi, hybrid, intercooler, intercoolers, magnahelix, test, testing, wrx