After getting the first 3.4 Whipple that was released we have tried ever mod to reduce AIT2 temps with limited success.
Talking with other owners that have seen the same problems many guessed we were limited by out Inter coolers.
About 4 months ago I got the guts to cut one open and see if there were any restrictions.
and this is what we found.
The inter cooler is not only a dual pass ( The fluid goes down one half then make a U and comes back the other half before leaving.)
Its has huge restrictions which cause the water to cycle very slow through the inter cooler.
Its has been reported that it is so restricted some stock system only cycle 1-2 time per quarter mile pass.
All large blowers make a ton of heat and the 3.4 has been test after the blower and before the IC with temps as high as 344F
What hurts us is heat soak and extended time under boost. That's why the temps are not as bad on the dyno or the street and sometimes don't show themselves till the track
To test the restriction
After building a bench set up with the absolute best case anyone will get from a stock IC the numbers are
3 gallons and 3 qts in 60 seconds
The capacity of a factory IC is 1 qt
so...
For every 4 seconds the coolant will cycle once. Remember every 4 seconds best case scenario and very few will ever get close to those numbers.
My estimate is
6 Seconds with a HE and a Mez pump
North of 8 Seconds with a stock system.
The solution
After sacrificing a few lower intakes and inter coolers we came up with a solution to the problem
The system are cut apart and
The restriction in the inter cooler are removed
The system in converted to a single pass to remove the U
The input is increased to a 1" feed
The original feed and outlet are now both used as an outlet that can be Y'ed or run dual return lines
This what the final product looks like with a 1" Heat exchange bi-pass valve
So what did these changes net?
3.75 gallons per minute to 13.5 Gallons Per minute with the same bench setup
These are about the only numbers that can be quantified.
The system has the potential to tune the flow by adding a ball valve to restrict flow when not racing.
I did this in mine by rerouting the flow through the heat exchanger and reducing down to 3/4 inch lines.
The optimal system would use an Ice Box to supply as much ice water through a run.
The use of an after market pump is also advised as well as an after market heat exchange for street use.
Talking with other owners that have seen the same problems many guessed we were limited by out Inter coolers.
About 4 months ago I got the guts to cut one open and see if there were any restrictions.
and this is what we found.
The inter cooler is not only a dual pass ( The fluid goes down one half then make a U and comes back the other half before leaving.)
Its has huge restrictions which cause the water to cycle very slow through the inter cooler.
Its has been reported that it is so restricted some stock system only cycle 1-2 time per quarter mile pass.
All large blowers make a ton of heat and the 3.4 has been test after the blower and before the IC with temps as high as 344F
What hurts us is heat soak and extended time under boost. That's why the temps are not as bad on the dyno or the street and sometimes don't show themselves till the track
To test the restriction
After building a bench set up with the absolute best case anyone will get from a stock IC the numbers are
3 gallons and 3 qts in 60 seconds
The capacity of a factory IC is 1 qt
so...
For every 4 seconds the coolant will cycle once. Remember every 4 seconds best case scenario and very few will ever get close to those numbers.
My estimate is
6 Seconds with a HE and a Mez pump
North of 8 Seconds with a stock system.
The solution
After sacrificing a few lower intakes and inter coolers we came up with a solution to the problem
The system are cut apart and
The restriction in the inter cooler are removed
The system in converted to a single pass to remove the U
The input is increased to a 1" feed
The original feed and outlet are now both used as an outlet that can be Y'ed or run dual return lines
This what the final product looks like with a 1" Heat exchange bi-pass valve
So what did these changes net?
3.75 gallons per minute to 13.5 Gallons Per minute with the same bench setup
These are about the only numbers that can be quantified.
The system has the potential to tune the flow by adding a ball valve to restrict flow when not racing.
I did this in mine by rerouting the flow through the heat exchanger and reducing down to 3/4 inch lines.
The optimal system would use an Ice Box to supply as much ice water through a run.
The use of an after market pump is also advised as well as an after market heat exchange for street use.
