So any turbo configuration will work, but to have a good setup it takes math and research.
With my 130 pump you want to have about 25-35 psi of boost to use that amount of fuel well. Ideally, a single turbo could achieve that well, but let’s explore the compound anyways, because we both know you’re going bigger and better in the future.
I’ll start by laying out some goals as far as psi per rpms, for a starting place let’s say:
1. 1500 rpms 5 psi
2. 2000 rpms 15 psi
3. 2500 rpms 20 psi
4. 3000 rpms 25 psi
5. 3500 rpms 30 psi
Now with those psi goals in mind, let’s calculate the airflow needed to reach that boost level at each rpms, using this formula
CFM=Displacement in Liters x rpms x volumetric efficiency x pressure ratio /5600
We know all of these factors, but we still need to calculate pressure ratio. That is done by adding 14.7 to the boost pressure, and dividing by 14.7. So we end up with this for our cfm at the five rpms points.
- 196.5 cfm
- 395 cfm
- 576.9 cfm
- 792.1 cfm
- 1040 cfm
Most compressor maps use lbs/min instead of cfm, so to estimate that, divide cfm by 14.5.
Your manifold charger (your smaller turbo) you want to light off quickly and carry up until 2200-2500 rpms where the atmospheric charger starts to build boost. Using the numbers above, a tbp4 Garrett turbo would be perfect for you. Here is the compressor map with the first three points marked in yellow, you can see if right in the middle of the map, where you are at peak efficiency.
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This turbo is internally wastegated so you won’t have to worry about adding an external wastegate to bypass this turbo once it builds enough boost.
Currently going for about $350 from Garrett:
https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/172982628848
As far as your atmospheric turbo, I would go with an s362 if you plan on changing it up later down the road once you have more fuel, or an s366 if you want to keep the compound setup.