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intercoolerFlow.htm
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<!--webbot bot="Timestamp" S-Type="REGENERATED" S-Format="%m/%d/%Y" startspan -->08/31/2003<!--webbot bot="Timestamp" i-checksum="12538" endspan --></font><P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>
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<p align="left"><font face="Verdana" color="#FFFFFF">Reprinted
from Turbo Gus' Webpage</font><font face="Verdana"><br>
<font size="-1" color="#ffffff">Updated April 14, 2002</font>
</font></p>
<p align="left"><b>
<font face="Verdana" color="#6699FF" size="2">*Turbo Gus Mahon,
unfortunately, is no longer with us. He was killed in late
Summer 2002 in a motorcycle accident. He was quite an inventive
person and was able to propel his 2.5L Turbocharged Dodge
Caravan into the 13's at the dragstrip, frustrating many
musclecar owners to no end. We will be reprinting some of his
more generic articles mainly due to the great information they
provide. We are extremely sorry to hear about the tragic
accident that took his life, but will remember always the
contributions he has made to the hobby. The following is the
article in full along with how the results were derived.</font></b></p>
<p align="left"><font face="Verdana" size="2">
<font color="#FFFFFF"> Flow is not the end-all be-all test
for intercoolers, but it is VERY important! If your turbo has to
make 5 extra psi to hold your desired boost level, you are
overheating the air by about 55 degrees, which means your "high
efficiency" cooler may become "low efficiency" in short order.
These flow results DO NOT show the cfm flowed; they show how the
coolers were tested for flow </font><b><font color="#FFFFFF">IN
RELATIONSHIP TO EACH OTHER</font></b><font color="#FFFFFF">.
</font></font></p>
<p align="left"><font face="Verdana" size="2">
<font color="#FFFFFF"><br>
</font><b><font color="#FFFFFF">This relationship is *NOT*
LINEAR!</font></b><font color="#FFFFFF"> </font></font></p>
<center>
<p align="left"><font face="Verdana" size="2">
<font color="#FFFFFF">This means that an increase of one inch
H2O from 10" to 11" represents a </font><b>
<font color="#FFFFFF">MUCH LARGER gain of backpressure than
</font></b><font color="#FFFFFF">an increase of one inch H2O
from 4" to 5". </font></font></p>
<center>
<p align="left"><font color="#FFFFFF" face="Verdana" size="2">
Nevertheless, this test tells which cooler outflows which, and
allows you to go from there in your selection. </font></p>
<center>
<p align="left"><font face="Verdana">
<img src="http://www.dohcfiero.com/Images/coolertest.jpg" width="634" height="429">
<br>
<img src="http://www.dohcfiero.com/Images/compcooler2.jpg" width="241" height="112"><img src="http://www.dohcfiero.com/Images/coolersupra3.jpg" width="320" height="192">
<br>
<b><font size="2" color="#ff0000">Isuzu
NPR
Supra</font></b><font size="2"> </font></font></p>
<center>
<p align="left"><font color="#FFFFFF" face="Verdana" size="2">
Here are the results of the test, starting with the best flowing
cooler, and descending to the worst flowing:</font></p>
</center></center></center></center>
<table border="1" cellpadding="0" cellspacing="0" style="border-collapse: collapse" width="100%" id="AutoNumber2">
<tr>
<td width="33%">
<font color="#FFFFFF" face="Verdana" size="2"><b>1. SPEARCO
intercooler</b></font></td>
<td width="33%">
<font color="#FFFFFF" face="Verdana" size="2">32 short thick
wide tubes.</font></td>
<td width="34%">
<font color="#FFFFFF" face="Verdana" size="2"><b>4" H2O</b></font></td>
</tr>
<tr>
<td width="33%"><b>
<font color="#FFFFFF" face="Verdana" size="2">2. TALON
intercooler.</font></b></td>
<td width="33%">
<font color="#FFFFFF" face="Verdana" size="2">42 short thin
narrow tubes.</font></td>
<td width="34%">
<font color="#FFFFFF" face="Verdana" size="2"><b>6"</b> <b>
H2O</b></font></td>
</tr>
<tr>
<td width="33%"><b>
<font color="#FFFFFF" face="Verdana" size="2">3. Supra
intercooler</font></b></td>
<td width="33%">
<font color="#FFFFFF" face="Verdana" size="2">30 ultra-thin
wide tubes</font></td>
<td width="34%">
<font color="#FFFFFF" face="Verdana" size="2"><b>6.75" H2O</b></font></td>
</tr>
<tr>
<td width="33%"><b>
<font face="Verdana" color="#FFFFFF" size="2">4. Isuzu NPR
cooler (small version)</font></b></td>
<td width="33%">
<font color="#FFFFFF" face="Verdana" size="2">16 ultra-thin
wide.</font></td>
<td width="34%">
<font color="#FFFFFF" face="Verdana" size="2"><b>8.25" H2O</b>
</font></td>
</tr>
<tr>
<td width="33%"><b>
<font face="Verdana" color="#FFFFFF" size="2">5. FORD
intercooler.</font></b></td>
<td width="33%">
<font color="#FFFFFF" face="Verdana" size="2">17 short<b>
</b>thick wide tubes.</font></td>
<td width="34%">
<font color="#FFFFFF" face="Verdana" size="2"><b>8.5" H2O</b></font></td>
</tr>
<tr>
<td width="33%"><b>
<font color="#FFFFFF" face="Verdana" size="2">6. VOLVO
intercooler.</font></b></td>
<td width="33%">
<font color="#FFFFFF" face="Verdana" size="2">34 long thin
narrow tubes.</font></td>
<td width="34%">
<font color="#FFFFFF" face="Verdana" size="2"><b>9" H2O</b>
</font></td>
</tr>
<tr>
<td width="33%"><b>
<font color="#FFFFFF" face="Verdana" size="2">7. MOPAR
intercooler. </font></b></td>
<td width="33%">
<font color="#FFFFFF" face="Verdana" size="2">10 long thick
wide tubes</font></td>
<td width="34%">
<font color="#FFFFFF" face="Verdana" size="2"><b>9.25" H2O</b></font></td>
</tr>
<tr>
<td width="33%"><b>
<font color="#FFFFFF" face="Verdana" size="2">8. SAAB
intercooler.</font></b></td>
<td width="33%">
<font color="#FFFFFF" face="Verdana" size="2">26 long thin
narrow tubes.</font></td>
<td width="34%">
<font color="#FFFFFF" face="Verdana" size="2"><b>10" H2O</b>
</font></td>
</tr>
</table>
<p align="left"><font face="Verdana" size="2">
<font color="#FFFFFF"> The results of the NPR cooler were
just added. Because of heavier air (cool with higher barometer)
than at the last test, everything was reading ONE psi higher
than last test, so the NPR result was adjusted accordingly. It
flowed one full psi better than our stocker, but has a MUCH
better surface area and cross-flow properties than the stocker.
</font><br>
</font></p>
<hr align="left">
<p align="left"><font color="#FFFFFF" face="Verdana" size="2">
Here's how the results were derived: </font></p>
<p align="left"><font face="Verdana" size="2">
<img src="http://www.dohcfiero.com/Images/blower.gif" width="395" height="172"></font></p>
<p align="left"><font color="#FFFFFF" face="Verdana" size="2">
As you can see, the abrupt change from over 3" ID to
a 2.5" pipe hampers flow. So we get 2" of backpressure from a
simple short straight 2.5" pipe. Therefore backpressure of the
coolers is measured in inches of water *above* 2". </font></p>
<p align="left"><font face="Verdana"><b>
<font size="2" color="#FFFFFF"><i>EXTERNAL FLOW TEST</i></font></b></font></p>
<p align="left"><font color="#FFFFFF" face="Verdana" size="2">
<br>
THIS TESTS THE ABILITY OF AMBIENT (OUTSIDE) AIR TO FLOW THROUGH
THE CORE OF THE COOLER, INTO THE ENGINE BAY. EACH EXTRA 5 MPH OF
AMBIENT AIR FLOW THRU THE CORE MAKES YOUR COOLER MORE
EFFICIENT. SPEARCO HAS CHARTS SHOWING DRAMATIC COOLING
EFFICIECY IMPROVEMENTS FROM BETTER FLOW. </font></p>
<p align="left"><font color="#FFFFFF" face="Verdana" size="2">I
have tested only 5 cores so far; here they are in descending
order of flow quality: <br>
</font></p>
<table border="1" cellpadding="0" cellspacing="0" style="border-collapse: collapse" width="100%" id="AutoNumber1">
<tr>
<td width="33%">
<font color="#FFFFFF" face="Verdana" size="2"><b>1. Supra
intercooler</b></font></td>
<td width="33%">
<font color="#FFFFFF" face="Verdana" size="2">30 ultra-thin
wide tubes </font></td>
<td width="34%">
<font color="#FFFFFF" face="Verdana" size="2"><b>5.0" H2O</b></font></td>
</tr>
<tr>
<td width="33%"><font face="Verdana"><b>
<font color="#FFFFFF" size="2">2. Isuzu NPR cooler (smaller
version)</font></b></font></td>
<td width="33%">
<font color="#FFFFFF" face="Verdana" size="2">16 ultra-thin
wide.</font></td>
<td width="34%">
<font color="#FFFFFF" face="Verdana" size="2"><b>5.75" H2O</b></font></td>
</tr>
<tr>
<td width="33%">
<font color="#FFFFFF" face="Verdana" size="2"><b>3. Spearco
intercooler</b></font></td>
<td width="33%">
<font color="#FFFFFF" face="Verdana" size="2">11 long thick
wide tubes</font></td>
<td width="34%">
<font color="#FFFFFF" face="Verdana" size="2"><b>7" H2O</b></font></td>
</tr>
<tr>
<td width="33%">
<font color="#FFFFFF" face="Verdana" size="2"><b>4. MOPAR
intercooler</b></font></td>
<td width="33%">
<font color="#FFFFFF" face="Verdana" size="2">10 long thick
wide tubes.</font></td>
<td width="34%">
<font color="#FFFFFF" face="Verdana" size="2"><b>9.75" H2O</b>
</font></td>
</tr>
<tr>
<td width="33%">
<font color="#FFFFFF" face="Verdana" size="2"><b>5. Spearco
intercooler</b></font></td>
<td width="33%">
<font color="#FFFFFF" face="Verdana" size="2">32 short thick
wide tubes.</font></td>
<td width="34%">
<font color="#FFFFFF" face="Verdana" size="2"><b>11" H2O</b></font></td>
</tr>
</table>
<p align="left"><font color="#FFFFFF" size="2" face="Verdana">
<b> </b>Surprises? Yes! The NPR tubes are so thin, that
they look like they would not flow well. Apparently the internal
fins are designed for very little resistance, and the cooler
actually beats the stocker by a decent margin in INTERNAL flow,
and beats the stocker HANDILY with EXTERNAL flow! </font></p>
<p align="left"><font color="#FFFFFF" face="Verdana" size="2">
<br>
The Supra cooler turned out to be just like the NPR cooler.
The thin tubes are very deceiving to look at. </font></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>
<P class=newstext align=center>
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