AgSilver

You are most definitely correct to say there is no "night and day" improvement. However, the water in your reservoir was warm because the warm coolant rises and there is no circulation to the reservoir. I suspect if had touched the HE, you would have found it to be at ambient temperature. If you do a WOT run and immediately stop (with the engine running) and touch the HE, it will be warm as there is no air flowing through it to create a heat exchange.

Remember, you cannot add cold, you can only remove heat. Oversize HE's do a good job of reducing the coolant to ambient temperature before returning it to the IC. As we all know, the IC in the E55 has limited BTU capacity unlike the twin top mounted IC's of the SLR. The best that can be done in our case is meth and chilled coolant.

Again, for myself, I'm satisfied with an larger HE and other cooling modifications. With an ambient of 80F at 500' MSL, a WOT run to, let's say, 175 MPH produces a max IAT of about 155F with recovery to 100F in less than 30 seconds. Just returned from Dresden (about a 300 mile run) and with the cruise control set on 110 MPH, the IAT was steady at about 15F over ambient or about 75F.

ArmoE55

I thought the whole point of split cooling was to split the circuit of water flow of the engine and HE? In other words, the engine water doesn't go through the HE and create higher IATs? That has to have at least some impact on IATs, no?

What am I missing here? Thanks.

Denroll

SDS... good solution.

And I wouldn't call it rape; such a harsh word. More like, "forced love via right foot."

S2K750

I thought of another way last night. I'm going to tap into the power wire to the pump and run a wire to the battery with an inline switch under the hood. I'll then be able to manually activate the pump anytime I want.

I'm a harsh guy and a rapist* lol I just got finished raping* her this morning and I'll rape* her on the way home too lol

100% talking about driving, please don't call the police* lol

S2K750

You have it right, he's just getting a little too scientific and thinking race car.

I almost want to take back saying its not night and day. I did 9 back to back 30-120 pulls on the way to work and by the 8th I still had at least 400hp lol.. Normally by the 5th I'm getting beat by civics.

ArmoE55

Don't get me wrong, I am not expecting a 30-40* drop in IATs, but even 5-10* drop makes it worthwhile when you're running only slightly over ambient (like in my case, for instance) in the humid summer months just cruising around. For example, if it's 65-70* ambient, with my current setup, I right around 75* cruising around town, no WOT runs or blower engagement. With the split cooling, I'd like to be right around ambient temps cruising around. That would satisfy me ... every bit helps. It's for those 3-4 months of summer that our cars suffer.

I'm not worried about the Fall and especially the winter months as the car feels like it gains 100HP At least up North here...you Cali and Florida guys, sorry

S2K750

Damn you! We get two months of nice weather, if we're lucky lol

WANTED!!

I actually just had my kit show up today. Anyone have pictures of the lies and mounting of the reservoir? The how to on here no longer has the pictures attached to it.