[AussieTrackrat]

Originally Posted by travislambert

I have a Magnuson 2650 and I can tell you from first-hand experience (with data), that you will never be able to keep that car cool or supplied with fuel without some serious supporting mods.

For a little background on my car... I have a stock lower, 90mm upper, big gulp, Nick Williams 103mm, cat deletes, and. JMS voltage booster. It dynoed at a little over 700 RWHP.

I'm having trouble keeping my temps down on hot days. My oil temps exceed 290F. My coolant temps are going above 240F. Unfortunately, there isn't much in terms of cooling upgrades available. Most of the products you see with "thicker cores" are snake oil. It just ends up increasing the pressure in front of the radiators instead of helping to cool. The increased mass of these units will help on the drag strip, but not the road course. I've actually been talking back and forth with the engineers at C&R Racing about a cooling solution. They told me straight up that their $1,200 radiator is no better than stock for road course.

If I could get the oil temps down, I think everything else would fall into place. In addition to C&R, I've talked to Improved Racing, Derale, Mishimoto, and others and nobody has a good kit available.

Last week I ordered a 95 mm pulley to drop the boost level and lower temps that way.

Fuel is another big problem for these cars. Sure there are plenty of "solutions", but basically none of them will work out of the box for road course use unless you keep things modest and go with a voltage booster only. Voltage booster will only get you to 700 RWHP reliably. Beyond that, you can run the engine lean.

The problem is we have a saddle style fuel tank. When you drop below 1/2 tank, and you go around a hard right turn, all of the fuel transfers to the left tank. Aside from a booster, none of the aftermarket solutions I've seen will keep up with fuel demand under this condition. The aux pumps like the junk DSX Tuning kit only taps the right side of the tank, so that's only a good option if you're eager to blow your engine. The Fore Innovations units delete the fuel bucket from the pump and therefore cannot provide constant pressure as the fuel sloshes around in the tank (because there is no buffer). Other units are pretty much variants of these solutions...designed for drag racing...not road racing. To my knowledge there are no reliable road racing lowside fuel solutions for more than 700 RWHP aside from a custom solution with a surge tank.

If you are serious about tracking the car in the heat, I think you'll need to dial back your build quite a bit to have a reliable setup.

Helpful. Thanks.

[juice3]

Originally Posted by NEZL1

Literally had zero issues so far with my magnuson heartbeat setup with longtubes.
The 2650 has even larger cooling bricks, so maybe I'm lucky.

But my car was built in AZ and tracked in AZ heat so here in New England it seems to be no problem whatsoever for a 20 min session.

Power level?


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