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Hey all,

Nostrum High Performance here. First time for us posting on the forum, although we’ve certainly been keeping up on reading all the great content posted. For those of you that don’t know, we’re the engineering company behind the AMS Alpha High Pressure Fuel Pump. As you probably do know, these pumps are an incredibly simple way to unlock the power potential of your Q, by increasing the max amount of fuel your system can flow.

We’ve seen this brought up a couple times on the Q50/60 FB page, but most recently we had a customer contact us with concerns about injector failures on his car, so we wanted to reach out on here to better explain how the VR30DDTT fuel system works, and dispel a few myths.

Here’s a basic diagram of the VR30 fuel system:



Firstly, a HPFP upgrade should always be done in conjunction with a low pressure “in tank” fuel pump upgrade to maximize its performance. Without this you will run out of fuel feeding the HPFP at higher loads, and it can’t build pressure without that fuel feeding it. Secondly, the VR30 has a single HPFP, so you only need to buy one, and you’ll never have to worry about any bank/bank variations due to the upgrade.

The primary confusion we’d like to clear up is that an AMS Alpha HPFP can NOT cause injector failure. However, OEM injector failure (Bosch HDEV5) is a well-documented issue on the VR30DDTT platform. Infiniti has gone as far as releasing a TSB for injector failure on these engines.



AMS has seen them fail on development vehicles with completely stock fuel systems, and we’ve personally encountered injector failure on an aggressively tuned 100% stock car. These injector failures are almost always due to a mixture of octane inconsistency and tuning issues, especially where the stock fuel system is particularly stressed (running ethanol blends on stock HPFP, etc).

What happens? The VR30DDTT does not currently have a table which sets a hard stop for the End of Injection (EOI) window as far as the industry knows. This means when you’re running high ethanol blends and need to inject for longer durations, if not accounted for (adjusting Start of Injection or SOI, etc.) your injectors can still be open when combustion occurs. This can damage the injector’s ability to seal properly, which leaves you with a leaky injector. Poor tuning resulting in knock events with the injector open is highly likely to cause injector failure, so we recommend ensuring your vehicle is always tuned by someone who knows what they’re doing when it comes to the VR30 platform. Especially with the stock fuel system. If you’re unsure, AMS offers experienced tuning services.


The secondary myth we’d like to tackle is the possibility of there being contaminants in the Alpha HPFP which could cause an injector to leak. The first thing to understand here is that each injector has a 10μm (micron) filter at its inlet. As such, no contaminant large enough to not flow safely through the injector is capable of actually entering the injector. As far as preventative manufacturing techniques, every HPFP component we manufacture is individually cleaned for potential contaminants, the sub-assemblies are flushed, the final assembly is flushed, and the pump is installed on our test bench, where it’s flushed again, and then has a test cycle run which verifies operation, all while flowing fluid through it.

In summary, we know how intimidating modifying a fuel system can be, but you can be assured in knowing that every HPFP that leaves our facility is completely clean of contaminants, and fully flushed, and validated before it ever reaches your hands. It’s then important to make sure not to introduce any contaminants to your fuel system during install, so we always recommend having a certified mechanic or AMS dealer perform any modifications to your car. The last step is getting a tune from a reputable VR30 shop to take advantage of your new fuel capacity! As always, contact AMS if you have any questions regarding your own Alpha pump install, and we’ll be behind the lines for any additional support needed. We’ll try to do a better job of being active on here as well.

Cheers!
 

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Hey Nostrum rep, can you gives us an idea when this type of upgrades is needed? If someone wants to make only 500 horsepower or less do they need this fuel system kit? Or is the kit necessary regardless of power output?
 

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Discussion Starter #4
Hey Boosted,

When we were running 500whp with E85 on our Q50 we were doing it with the Walbro LPFP and an AMS HPFP upgrade.

Looking at the dyno records page on the Q50 forum, it looks like everyone making +500whp without race gas is running the AMS HPFP. Fueling is a crucial part of your engine's performance, and is also critical in ensuring its longevity.

While it may be possible to eke out 500whp at the ragged edge of the OEM parts, you would be doing so at a pretty extreme risk to your car. The AMS fuel system upgrades are a tried, true, and safe way to make big power on a VR30.
 
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