Harrop Owners Chime In!

[CamasM3e93]

Originally Posted by RUG8RB8

Thanks, corrected yes 481 at 7450. I have no cats installed, just resonators.

Was thinking that the kit usually hits around 500 whp with test pipes but I see that they let off the gas at 7500 rather than driving it up to the redline. Assuming you would continue to build horsepower with that last 800-900 rpm looks like your kit is consistent with expectations and you've got a solid build.

Really appreciate you circling back and sharing it with the group. I've not done a dyno and would love to just for the hell of it.

[RUG8RB8]

Is anybody familiar with who’s install this is???

Harrop M3 with F1 Interchiller Installed

IAT’s are a killer on our setup, this should cure the problem.

[BP709]

Originally Posted by RUG8RB8

Is anybody familiar with who’s install this is???

Harrop M3 with F1 Interchiller Installed

IAT’s are a killer on our setup, this should cure the problem.

I’ve been eyeballing the FI interchiller for awhile now. Would love to see more in depth pictures and details of that install.

[drwankel]

The interchiller kit does seem interesting, and I suspect it would definately add some power.

I just don't understand how they can claim it doesn't affect cabin a/c performance.

You are essentially asking for additional cooling capacity from the A/C system with the same size condenser and compressor. How could cabin a/c performance not be impacted?

Second concern, is isn't the IAT measured before the intercooler cores in the harrop supercharger manifold? Meaning even if the interchiller can get the intercooler water significantly colder, would the fuel management even know?

[RUG8RB8]

The IAT sensor is located post passenger side heat exchanger. We have an upward flow S/C, ie the air is sucked in from the bottom and exits the top where it is forced through each heat exchanger downward and into the ITB’s. Please see picture provided by Mark. Personally, I don’t care for IAT sensor placement, it is located in what I call a dead zone. It is not really located optimally where it is in a flow zone, but with our Very unique situation it is difficult. The same problem arises when trying to use a WMI system with our design. There are very limited spots to mount the nozzles unless you want to do a “suck through”. I have been reading up on the subject and it does not seem to affect the lobes and it far better than nothing, but not optimal. Ideally you would want to spray, post heat exchanger pre ITB downward into the throttle plate. This is easy on a centrifugal style S/C but not on our setup. I am toying with the idea of drilling the lid/roof of the S/C in 8 locations directly above the ITB’s and spraying post lobes but pre heat exchanger. I am worried about hood clearance though. Anybody that has previously added WMI please chime in!

[RUG8RB8]

If the IAT where a longer design, the placement would be quite good, please see picture below that I quickly hand edited. If you notice it appears to be slightly forward of the actual hole for the ITB as well, and not centered.

[DRLane]

Originally Posted by RUG8RB8

The IAT sensor is located post passenger side heat exchanger. We have an upward flow S/C, ie the air is sucked in from the bottom and exits the top where it is forced through each heat exchanger downward and into the ITB’s. Please see picture provided by Mark. Personally, I don’t care for IAT sensor placement, it is located in what I call a dead zone. It is not really located optimally where it is in a flow zone, but with our Very unique situation it is difficult. The same problem arises when trying to use a WMI system with our design. There are very limited spots to mount the nozzles unless you want to do a “suck through”. I have been reading up on the subject and it does not seem to affect the lobes and it far better than nothing, but not optimal. Ideally you would want to spray, post heat exchanger pre ITB downward into the throttle plate. This is easy on a centrifugal style S/C but not on our setup. I am toying with the idea of drilling the lid/roof of the S/C in 8 locations directly above the ITB’s and spraying post lobes but pre heat exchanger. I am worried about hood clearance though. Anybody that has previously added WMI please chime in!

I tried WMI with various size nozzles with full spray at 4PSI to 8.5 PSI on my Harrop and saw no meaningful reduction in IAT on track. I wasn’t planning to tune for it, simply wanted to lower temps.

I had asked Mike about it going in, and he said I wouldn’t likely see what I was hoping for… Played with it for a summer here in Colorado and since pulled the whole system.

At this point my thought is to delete the heat exhanger, and route the SC intercooler coolant through the firewall into a small YETI type cooler with copper coils surrounded by dry ice in the passenger footwell area. And pump it back up into the plenum.

A capable cooler should vent dry ice and 10lbs should easily last a whole day at the track. Sadly the cooler will likely add 10lbs but at least I can pull it away from the nose.

Edit: likely what’s offered via chiller but I’m deleting the HVAC and don’t want the additional strain from running AC to enable the Chiller.

[drwankel]

Originally Posted by RUG8RB8

If the IAT where a longer design, the placement would be quite good, please see picture below that I quickly hand edited. If you notice it appears to be slightly forward of the actual hole for the ITB as well, and not centered.

Oh interesting! I didn't realize it was post intercooler core. At least at that point, the engine management would be able to see some reduction in IATs from the interchiller system.

[DrFerry]

cchen9_ posted about his meth injection installation on his Harrop equipped car over on his thread. Cross posting here just in case other thread subscribers haven’t seen it.
.
https://www.bimmerpost.com/forums/sh...php?p=30001851

[DukeofAlexandria]

I’ll chime in with DRLane and The Doc.

I CAD’d out small miniature 1/2” velocity stacks that you could drill and tap to put on top of the throttle bodies.

I mocked one up in a 3D printer before I installed my Harrop and….I just don’t think it would work without a LOT of additional work and even then I’d have to custom bend meth tubes to get to all 8 throttle bodies. Like DRLane said, by the time you push it through the fins, it quickly becomes heat charged and you wouldn’t see a huge reduction or help.

BUT, I’m positive that if you could basically direct inject into the throttle bodies, you would see some decent gains all things considered. Im just not willing at this time to dive deeper into it.

-Duke