DMS Supercharger Coolant Pump Test Number 2
Aug 19th 2025
It's been a few years since we did a big coolant pump show down and we have some new players on the field. This time we're doing a static test using some typical components found in most supercharged setups. We have a LSA supercharger lid with a stock intercooler brick, DMS billet inlet manifolds both in -12an and -16an, a CSF heat exchanger for the Gen 2 CTS-V and a custom test tank. The smaller pumps will be tested with both a short hose setup (found in most cars with a small engine bay tank) and a long hose setup (about 35 feet to simulate a trunk tank setup). The larger pumps will be tested with -12an and -16an in both short and long scenarios.
The pump lineup:
- OEM Gen 2 CTS-V Bosch
- OEM 5th/6th Gen ZL1, V3/C7 Z06
- Davies Craig EBP40
- Davies Craig EWP150
- DMS 100 (more info on this later)
- Pierburg CWA50
- Pierburg CWA100
- Pierburg CWA150
- Peirburg CWA200
- Pierburg CWA400
- EMP WP29
The test bench.
The key take away from this test is that hose diameter and length play a large role in flow rate. If you have a trunk tank setup but plan to run -12an hose you may find the Pierburg CWA150 to be a better value flowing 10.5 GPM @16 amps compaired to the CWA400 flowing 9.70 GPM @26 amps and the EMP flowing 13.20 GPM @30 amps.
Final results:
To make things easy I'm posting 3 graphs. 1st is all the pumps tested with -12an hose only, then -16an hose and finally all the data in one spot.
Raw data.
Pump ConfigurationFlow Rate Gallons Per Minute
| OEM Gen 2 CTS-V Short 12an | 6.75 |
| OEM V3/ZL1 Short 12an | 7.80 |
| Davies Craig EBP40 Short 12an | 7.50 |
| Davies Craig EBP40 Long 12an | 6.25 |
| Davies Craig EWP150 Short 12an | 6.50 |
| Davies Craig EWP150 Long 12an | 5.15 |
| Davies Craig EWP150 Short 16an | 9.75 |
| Davies Craig EWP150 Long 16an | 7.50 |
| DMS 100 Short 12an | 8.60 |
| DMS 100 Long 12an | 7.30 |
| Pierburg CWA50 Short 12an | 9.50 |
| Pierburg CWA50 Long 12an | 7.75 |
| Pierburg CWA100 Short 12an | 11.50 |
| Pierburg CWA100 Long 12an | 9.30 |
| Pierburg CWA150 Short 12an | 11.60 |
| Pierburg CWA150 Long 12an | 10.50 |
| Pierburg CWA200 Short 12an | 10.00 |
| Pierburg CWA200 Long 12an | 7.50 |
| Pierburg CWA200 Short 16an | 15.30 |
| Pierburg CWA200 Long 16an | 12.75 |
| Pierburg CWA400 Short 12an | 13.35 |
| Pierburg CWA400 Long 12an | 9.70 |
| Pierburg CWA400 Short 16an | 19.50 |
| Pierburg CWA400 Long 16an | 16.50 |
| EMP WP32 Short 12an | 16.75 |
| EMP WP32 Long 12an | 13.20 |
| EMP WP32 Short 16an | 21.30 |
| EMP WP32 Long 16an | 18.60 |