Cobra Heat Exchanger...specifically for our cars

[vandy0419]

Talked with Mark again from LFP...all the talk about the cobra heat exchanger and I never mentioned it to him. They make upgraded heat exchangers for Cobras that offer twice as much flow and he said they can make them dual pass even.

They will be available around the end of the month!!! Around the same time to expect the Ice Box from them to be realeased so adding the two of them together he said on a Cobra they see about a 25-30% drop on a Cobra, but the Ice Box I fabbed up for them is a lot larger than the Cobras so that means more room for the coolant to chill.

Can you imagine a 30 degree or so difference between IAT1 and IAT2 while at the track?

[Doc_ss]

sounds good..does this upgrade run $300..??
also, can your IAT2 temp be lower than your IAT1 temps?

[vandy0419]

Originally Posted by Doc_ss

sounds good..does this upgrade run $300..??

Yeah, probably right around there, but seeing it will fit right up to our car and is a lot better than the stock cobra heat exchanger. In the view of SuperBird...instead of having a Honda and doing an upgrade for a B16 as a part off of the K20 or something, its like taking a upgraded performance part for the K20 and putting it on your B16.

also, can your IAT2 temp be lower than your IAT1 temps?

Not sure, but I don't see why not as long as:

Temp Rise in air circulating in s/c < Temp drop (from temp in s/c minus temp after IC)

[superbird]

Originally Posted by vandy0419

Yeah, probably right around there, but seeing it will fit right up to our car and is a lot better than the stock cobra heat exchanger. In the view of SuperBird...instead of having a Honda and doing an upgrade for a B16 as a part off of the K20 or something, its like taking a upgraded performance part for the K20 and putting it on your B16.



Not sure, but I don't see why not as long as:

Temp Rise in air circulating in s/c < Temp drop (from temp in s/c minus temp after IC)

no!!!!!!!!!!!!! iv been slanderized

[Pierre]

Originally Posted by Doc_ss

sounds good..does this upgrade run $300..??
also, can your IAT2 temp be lower than your IAT1 temps?

AIT2 can only be lower that AIT1 if you use an ice box or a resevir cooled by the AC system. Without it the best you can do is to bring AIT2 to ambiant temperature which unless you have a hot air intake would put AIT2 within 5-10 degrees F of AIT at road speeds. This would require 100% efficiancy in the heat exchanger/intercooler system which isn't going to happen. 75%-85% is a reasonable goal. The former being stock and the latter upgraded. The Cobra heat exchanger has the most potential from what I can see. The only question being can the laminova's take advantage of the lower temperature coolant and not become the limiting factor.

Soapbox mode

I'm disturbed when people want to compare AIT1 to AIT2 just driving around. It serves no real purpose. A more valid method is to do a WOT 3rd gear pull from 30 to 90 mph and record AIT1 and AIT2 at 90. This will give you a much better way to compare efficiancies of both stock and upgraded intercooler systems if horesepower is the goal.

Pierre

[djt81185]

Originally Posted by Pierre

AIT2 can only be lower that AIT1 if you use an ice box or a resevir cooled by the AC system. Without it the best you can do is to bring AIT2 to ambiant temperature which unless you have a hot air intake would put AIT2 within 5-10 degrees F of AIT at road speeds. This would require 100% efficiancy in the heat exchanger/intercooler system which isn't going to happen. 75%-85% is a reasonable goal. The former being stock and the latter upgraded. The Cobra heat exchanger has the most potential from what I can see. The only question being can the laminova's take advantage of the lower temperature coolant and not become the limiting factor.

Soapbox mode

I'm disturbed when people want to compare AIT1 to AIT2 just driving around. It serves no real purpose. A more valid method is to do a WOT 3rd gear pull from 30 to 90 mph and record AIT1 and AIT2 at 90. This will give you a much better way to compare efficiancies of both stock and upgraded intercooler systems if horesepower is the goal.

Pierre

technically thats wrong u want to eliminate varia nce caused by extermal temperatures

u want a 30-90 wot run in 3rd but compare the slopes of the curves as the iat2 rises...the lower the curve the more efficient

im an IE...4 levels of statistics lol

[Pierre]

Originally Posted by djt81185

technically thats wrong u want to eliminate varia nce caused by extermal temperatures

u want a 30-90 wot run in 3rd but compare the slopes of the curves as the iat2 rises...the lower the curve the more efficient

im an IE...4 levels of statistics lol

We could get complicated and generate a map for all the conditions and there is nothing wrong with taking things one step further. My method is a simple attempt to get measurements with the system steady state if thats really ever possable so one can measure the efficacy of any modifications. It's far more accurate than driving around the neiborhood.

Any difference in the curve slopes will be more due to mass differences than heat exchanger efficiancy. For instance an ice box with no heat exchanger will be more a measure of thermal mass as opposed to system efficincy with the exchanger. One can only store energy and release it the other is dynamic and can continue to cool long term.


Pierre

[djt81185]

Originally Posted by Pierre

We could get complicated and generate a map for all the conditions and there is nothing wrong with taking things one step further. My method is a simple attempt to get measurements with the system steady state if thats really ever possable so one can measure the efficacy of any modifications. It's far more accurate than driving around the neiborhood.

Any difference in the curve slopes will be more due to mass differences than heat exchanger efficiancy. For instance an ice box with no heat exchanger will be more a measure of thermal mass as opposed to system efficincy with the exchanger. One can only store energy and release it the other is dynamic and can continue to cool long term.


Pierre

i just didnt want people comparing peak iat2's and saying well it went up after the intercooler upgrade...when it was iat1 that was much higher ya knowlol

[vandy0419]

As far as IAT2 being less than IAT1...yes, I am talking about with the cobra heat exchanger and Ice Box...

[Pierre]

Originally Posted by vandy0419

As far as IAT2 being less than IAT1...yes, I am talking about with the cobra heat exchanger and Ice Box...

The addition of the Cobra exchanger to an icebox system can in fact warm the icebox up faster. The cooled fluid from the icebox will warm up as it goes through the heat exchanger assuming it's not winter and ambiant air is colder than ice water. The exchanger works both ways . You would have to put a themostat or valve in that would bypass the exchangers when the coolant/ice water is below ambiant air temperature.

I'm a post whore tonight

Pierre