[2018zl1-1le]

Does the magnuson 2650 need any extra cooling? And what pulley sizes needed to get around 15psi?

[Joshinator99]

Originally Posted by 2018zl1-1le

Does the magnuson 2650 need any extra cooling? And what pulley sizes needed to get around 15psi?

I’d pair the 2650 up with good quality heat exchangers and a Pierburg CWA150 pump. That should match up well with the 2650 bricks and offer great IATs. Are you running E85?

What pulley combo and PSI are you at now? Stock cam or aftermarket?

[SOCAL.M6.ZLE]

Originally Posted by 2018zl1-1le

Does the magnuson 2650 need any extra cooling? And what pulley sizes needed to get around 15psi?

Hey buddy, simple answer is yes, but how much depends on your power level. In short, the 2650 bricks do a fantastic job at transferring heat into the HX coolant, but thats it. The OEM HX system is flawed in several ways... 1; it lacks volume, and can heat soak easily, which is why fender and trunk tanks are so popular. 2; it lacks flow. To many restrictions choke the pump, which is why we like to upgrade all of the hoses to 3/4" as well as upgrade the heat exchangers. 3; The main front heat exchanger itself is far to small, which is why so many upgrade at least the main front HX. Addressing those 3 areas will give our HX system a fighting chance. Just don't forget the the other areas of under-hood thermal management like header wrap, coolant temps, and oil temps... all things combined will help that heat pump under the blower stay as cool as possible.

[2018zl1-1le]

Originally Posted by Joshinator99

I’d pair the 2650 up with good quality heat exchangers and a Pierburg CWA150 pump. That should match up well with the 2650 bricks and offer great IATs. Are you running E85?

What pulley combo and PSI are you at now? Stock cam or aftermarket?

I’m currently running stock upper and 9.25 lower stock supercharger, BTR stage 2 cam. I’m looking to get a 2650 and port injection and run E85 or E70ish at the pump. Already did the low side pump. Willing to change lower pulley or both to whatever is needed to get to get around 15ish psi. I have larger HX will be installed at the same time as the 2650 and port injection

[Joshinator99]

Originally Posted by 2018zl1-1le

I’m currently running stock upper and 9.25 lower stock supercharger, BTR stage 2 cam. I’m looking to get a 2650 and port injection and run E85 or E70ish at the pump. Already did the low side pump. Willing to change lower pulley or both to whatever is needed to get to get around 15ish psi. I have larger HX will be installed at the same time as the 2650 and port injection

I’d guess a 3.5” or 3.75” upper with a 9.25” lower will get you 15 psi which will definitely rock and roll with a 2650/cam car. You might want to do a Smoothboost control so you can creep up on the power on the dyno to make sure everything is safe, and then dial down the power a bit on the street without having to change pulleys. But that setup will pretty much max out safe LT4 bottom end power IMO.

[KingLT1]

2650 @ 15psi likely won't need any other cooling mods especially with some ethanol. Ethanol loves heat to help it burn efficiently. All of the additional cooling mods is usually needed when running a stock blower turned up on pump gas. It's apples to oranges. If the engine timing is optimized, then you would need to start pulling some out when MAT's creep into the 130's degree range on Pump. On Ethanol you can go another 40-50 degrees without pulling timing. I still pull a little out starting around 155 but I like to be conservative. I doubt you even see 150 degree MAT's with that setup anyways unless it sat in traffic idling on a 90 degree day but it would likely come down into the 120-130 range once you start moving.