Quote:
Originally Posted by DR_
The lower BTU rating is what is applicable to wet sump cars like ours. I think the 72 fits the front bumper opening pretty well so it is a good choice for our car but I don't think it will cool any better than the wide 25 row.
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I would agree with 90% of the statement. I think the differences will show as speed increases. Especially the larger surface area. Hot engine oil spends more time in the oil cooler before being recycled back. The 25 row is rated at 33,000 on the low end as opposed to 40k on the 72. The 34 row would be the better comparison. 183 square inches of surface area vs 135 for the 34 row or 99 for the 25 row. It correlates with the hp rating more than the BTU. 325-425 for the 25 row (great for NA), 400-475 (full bolt on's or mild boost) with the 34 row, and 600+ (FI) on the 72. I'm thinking there has to be a serious load on the 72 row to show it's merit over the 6 series coolers. It would make sense that GTM offers twin 34 row oil coolers to cool it's most powerful FI setups, as they package easier and can handle a lot of power. IMO, it's better to look at the hp rating than BTU per hour due to the variables to match it. We don't match intercoolers as to how many BTU's per hour they cool, but by their hp rating.
If I were to do it all over again, I would have saved my money and gotten something smaller, but now that the car is going FI, I'm glad I sent the extra $150 to get it over a 34 row.
