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Did you fill in and machine or do anything additional to smooth out that lower transition from your upper intake to the supercharger? Not trying to say it won't work without doing that, I have no idea how turbulence affects the efficiency of the blower. I'm really just curious.
The donut elbow (very tight radius 3" tube) blows directly at the bypass valve intentionally in this build because twincharger. When the turbo spools it will outrun this little SC so it will be a bit more efficient to blow past it as much as possible. I agree it would be better to have the donut got the full 180 degrees to point directly at the SC rotors if this were a SC only conversion.
Here is what faces the rotors, you can see the end of that donut elbow:
If this works out and I desire more glory, the current plan is to go big turbo and weld on a larger bypass into the side of the intake and use a secondary throttle body to control the bypass. The benefit of this SC is anti-lag especially with a big exhaust turbine. It will add area under the curve in the low-mid range. That's the idea at least...
Bypassing the SC will lower the overall airflow that the engine sees but it will reduce heat.
The way I think of it is, you car is essentially supercharged. Without the turbo, it acts like any other supercharged car would. Adding the turbo just increases the blower inlet pressure which dramatically increases the efficiency of the blower. Youre never going to "outrun" the supercharger with the turbo because the SC just multiplies everything it intakes.The SC is ALWAYS increasing overall airflow. Once the turbo comes on fully the benefits are diminished but its not getting in the way persay. Also, running a larger pulley like a 3.8 also helps to increase blower efficiency and keep the temps way down. On my car and other twincharged deltas ive seen, the stock SC cooling system was controlling intake temps quite well.
Bypassing the SC will lower the overall airflow that the engine sees but it will reduce heat.
The way I think of it is, you car is essentially supercharged. Without the turbo, it acts like any other supercharged car would. Adding the turbo just increases the blower inlet pressure which dramatically increases the efficiency of the blower. Youre never going to "outrun" the supercharger with the turbo because the SC just multiplies everything it intakes.The SC is ALWAYS increasing overall airflow. Once the turbo comes on fully the benefits are diminished but its not getting in the way persay. Also, running a larger pulley like a 3.8 also helps to increase blower efficiency and keep the temps way down. On my car and other twincharged deltas ive seen, the stock SC cooling system was controlling intake temps quite well.
Just starting to look into the pulley replacement. Do you have the pulley puller? I have a bearing splitter and hydraulic press so looking at the ZZP instructions I can get the pulley off. I assume I can make a tool to press it on with a threaded rod and some nut ingenuity.
If you enjoyed doing that to the supercharger, there's a market of ecotec-swapped Miatas that would like that done, too.
As long as it isn't going to hit that frame rail, might need to angle the engine like they did with the Solstice.
MIATA Ecotec swapped:
SOLSTICE ecotec on an angle. The engine mounts are custom, but based off of the stock mounts (made jigs off the stock mounts to build the custom ones):
I don't think he needed to, but he may have cut some of the shelf. Tub cutting and forming has been quite common ever since people have shoved LS engines in Miatas. The caveat is once you get to around 250HP you need a different transmission, and the angle of the AR5/Ecotec creates issues like this.
Those Miata people are sucking up all the good used engines.
In the kappa world, Toyota guys are taking all our AR5 transmissions (rwd) to swap into their cars, it bolts right up to JZ engines. Interesting that these Islanders need this 'merican spec'd stuff to make power or not break.
03-25-2019, 08:06 PM
Moderator
, but I'm down
