Quote:
Originally Posted by OzBMR
Just fact checking on the flow data quoted by Dorch Engineering on their web site and in the first post here regarding stock Bosch pump for original B58 and B58TU.
From the Bosch web site and data sheet here https://www.bosch-mobility-solutions...pressure-pump/
Bosch HDP5 (OEM N55 HPFP) has a maximum flow of 1.12 cm3 per cam rotation
Bosch HDP5 EVO (Rev C) has a maximum flow of 1.2 cm3 per cam rotation, if using a 4 cam x 4.7mm lobe. BMW uses a 3 x 4.7mm lobe so the maximum flow with the BMW cam specs is 0.897 cc/rev (188 l/hr at 7000 rpm) This product has a 250 bar or 500 bar internal pressure relief valve, reduced internal restrictions and introduction of EVO parts (outlet valve) For original B58 the 250 bar internal pressure relief valve is used.
Bosch HDP6 (has a maximum flow rate of 1.3 cm3 per cam rotation (210 l/hr) and 500 bar internal pressure relief valve. With the 3 x 4.7mm lobe the maximum flow rate is 1.1074 cc/rev (232 l/hr at 7000 rpm)
So, the HDP6 with the stock B58 cam profile provides about 23% more flow than the stock HDP 5 EVO (previously calculated 8.3% based on the maximum Bosch flow rates using the 4 x 4.7 cam profile for both pumps)
Based on the same 3 x 4.7mm cam lobe profile XDI-35 (10.5 mm piston) has capacity of 1.221 cc/rev for 256 l/hr (36% more flow) and XDI-60 (11.5mm piston) is 1.465 cc/rev for 307 l/hr (63% more flow) at 7000 rpm |
So based on the above and all other things being equal (turbo, tune, bolt-on's), is the XDI the best future proofing option? These things scale based on need, correct? Ie. if the car is stock, the pump will perform at stock flow (as needed), and increase as the demand requires up to its above-mentioned limits (1.221 cc/rev)?