Intercooler efficiency

[Davezj]

Do you know if there are any figures for the efficiency of the eBay intercooler a 600x300x76mm
i am doing some calculations and need a figure for it.

iknow they can be estimated at 75% but does anyone have a figure from somewhere.
i remember seeing it in one of the eBay ads but I can't remember which one.

[adaxo]

1050cfm @ 0.5psi drop.

http://www.ebay.co.uk/itm/UNIVERSAL-...wAAOxyn9BRa9I7

Is that what you after?

[Davezj]

Yes that is the sort of thing. Thank for taking the time to find this.

that is a fin and tube core, not sure if a bar and plate type is the same sort pressure drop.
Mine is a bar and plate.


Sent from my space-aged gizmo

[Davezj]

does anyone know if the bar and plate or tube and fin intercooler have less of a pressure drop across them and what the approximate efficiency is.

this is a tube and fin quoted pressure drop.
Designed for maximum cooling capacity while allowing for minimal pressure drops.
1050cfm @ 0.5psi drop.

so if you are running at about 650CFM the pressure drop should be less.

what sort of pressure drop do you get on an air filter, @fassi1 did some pressure drop measurements on the inlet maf side of the turbos i seem to remember.

[fassi1]

Air filter and MAF don't produce significant pressure drop, almost nothing. it was a standard snorkel that slots in to the airbox which creates the biggest restriction.

[Davezj]

Can you remember want the total drop was across the full inlet to the entrance of the turbo

I am trying to calculate the pressure ratio so I can apply that to the correct point on a compressor map.

Sent from my space-aged gizmo

[fassi1]

There is thread somwhere with all my data.
Will try to dig it out.

[Grid]

http://www.clubvr4.com/forum/showthr...+pressure+drop

[fassi1]

There you go, I couldn't find it.

[Davezj]

i have done the reading of other thread again and it seem that i can use about 2 psi as the pressure drop across an unmodified inlet system.

so if i assume the bar and plate intercooler is more restictive that the fin and tube i could say the bar and plate intercooler will drop 0.5 -1.0psi

so i can calculate the pressure ratio with the pressure losses included.

but i still need to get some info on the actual efficiency of the intercooler.

i suppose i could try and measure the inlet and exit temps and work it out that way.
i believe the compressor exit temp can be calculated.
we will see.

[fassi1]

What is the purpose of your calculations Dave?
Is it just pure interest or you trying to work out potential gains?

[Davezj]

i have all the formula to plot the results on a compressor map and determine if my required hp figure is achievable from the turbos i am considering upgrading to.

i am going to do a complete write up on how to selecting the correct turbo for your power needs based on the engine you have. this will allow anyone to have a realistic idea of what you can achieve based on facts and physics rather than personal opinion.
i am hoping to be able to create an excel spread sheet that will do all the calculation for you and do all the unit conversions for you as well.

I have been doing a lot of back ground research into what you need to know to make the decision on what turbo to use for your needs, but a lot of the info relies on using a cc for your engine capacity, work in lb/min of air flow, etc , etc.
so i want to create the speadsheet to make it easy for everybody.

i would like to make it unit neutral and as simple as possible to use.

[fassi1]

Sounds like a task, hats off for effort.
Unfortunately that will only be estimated calculated value.

[Davezj]

Yes I know,
This is why I am trying to get as much real data and values as possible., to minimise the guess work I mean considered assumption.


Sent from my space-aged gizmo

[lateshow]

I have this really cheap ebay style 600x300 FMIC and I think it's a restrictive part now. Pressure drop isn't an issue, the actual cooling power must be....

[Davezj]

I have this really cheap ebay style 600x300 FMIC and I think it's a restrictive part now. Pressure drop isn't an issue, the actual cooling power must be....

You have to consider both.
the pressure drop across the intercooler is used in the calculation for the pressure ratio and the into cooler thermal efficiency is used in one of the other calculation.

So yes both are important. It seems to be noted in a few online site that on average larger intetcoolers are about 70-75% efficient so you use 0.70-0.75 in the calc


Sent from my space-aged gizmo

[lateshow]

I think that the only way to go is a HDI GT2 intercooler. Shame that they only sell them in australia/new zealand. Customs and freight.....

[Bobby~d]

^^^ I bought that one and installed it now my VR4. To me it works great. Only downside was the cutting of the crash bar to get it to fit up properly. No other modification had to be done tho.


Dw@r!k@

[Grid]

^^^ I bought that one and installed it now my VR4. To me it works great. Only downside was the cutting of the crash bar to get it to fit up properly. No other modification had to be done tho.


Dw@r!k@

You don't have to cut the crash bar, not unless your intercooler is thicker than the standard 76mm...

[Grid]

Oh and by the way - once I finish putting my Legnum back together I should be able to share accurate temperature difference readings (eg. plotted vs boost pressure and throttle position) since I have now installed thermocouples before and after the intercooler (600x300x76). Even bought a differential pressure sensor to go with that, but I'd rather get the car back on the road first.