aharres Posted November 8, 2016 Report Share Posted November 8, 2016 I've got a 1999 V70 T5 auto and I've recently done a bit of work to it. K24, R manifold, S60R MAF, Do88 S60R turbo inlet pipe, Do88 intercooler, Do88 RIP kit, EST 3" downpipe to mototec (simons) 2.5" catback, S60R green injectors, and a walbro 255lph fuel pump that I got from fuel-pumps.net which is supposedly a reliable source. I'm running a hilton tune and we're at about 14 psi of boost at the moment and my injectors are going 100% at higher rpms. I got the injectors from eerie vovo and they had about 70k miles on them. I measured 58psi fuel pressure at idle, but I don't really have a way of testing fuel pressure at high rpms. Theoretically, my fuel pump should be overkill for my application, so I don't see how it could be dropping pressure unless I got a faulty pump. But on the other hand, shouldn't these injectors be plenty big for a k24 since they came from an S60R in the first place? Link to comment Share on other sites More sharing options...
Tightmopedman9 Posted November 8, 2016 Report Share Posted November 8, 2016 Test the voltage at the pump. I would say about 30% of the cars I tune need a dedicated relay and lead straight from the battery to provide enough power to the pump. Link to comment Share on other sites More sharing options...
aharres Posted November 10, 2016 Author Report Share Posted November 10, 2016 What would be the best way to do this? I'm assuming the car should be running so there's nominal voltage. I guess I could unplug the pump and measure the voltage at the leads before the car dies? Link to comment Share on other sites More sharing options...
Tightmopedman9 Posted November 10, 2016 Report Share Posted November 10, 2016 You need to measure the pump under load, if you disconnect it there won't be any load so voltage drop will be negligible. Just get some sewing needles, stick them in the backside of the connector and use them as test leads. Link to comment Share on other sites More sharing options...
aharres Posted November 10, 2016 Author Report Share Posted November 10, 2016 Sewing needles! That's a great idea. Thank you. Link to comment Share on other sites More sharing options...
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