R34 Gt-R Project
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Stock RB fuel pressure is near enough 43.5 psi, so the latency in that table at 31.6 will be close. You can see that 7 or 8 psi equates to about 0.4µs extra latency. So if you wanted to interpolate between the 31.6 and 39.9 psi values you could say you're going up about 2 psi out of those 8, so add about 0.1µs, which is barely worth talking about and is quite possibly wrong because ideally you would fix the latency while running at the appropriate conditions on the dyno, with a wideband sniffing its butt. -
The pressure, is what you set the fuel pressure to. If you have the factory fuel reg, you'll need to find the factory spec. I don't know it off the top of my head, but someone else might. -
For others, what GTSBoy states here should be paid attention. Why? Well lots of people play with different engines, and they LOVE to change things like remove AC, or steering pumps etc, and it lends to them needing to move the tensioner too. You want your tensioner, particularly those that are sprung or hydraulically tensioned, to be the first thing after the harmonic balancer, or technically the "last" pulley in the chain. By saying last pulley, I mean look at the direction the crank spins when the engine is running, follow the belt from where the crank is pulling the belt FROM, and keep following that until you're between the last pulley/accessory on the belt and about to reach the crank again, this is the spot where you put the tensioner. This is the area that will always end up with slack. This is worked out exactly the same way for chains too, as the physics is the same for them. The crank pulley is where all the force to drag the belt around comes from. You will never ever get rid of the slack that appears, especially under load. The tensioners job is to keep the belt loose enough when stationary that there shouldn't be out of sync movement in slow movement, and then be tight enough when running, that the belt can't jump off any gear and get damaged. Too tight, bad things happen, too loose, bad things happen. Have a tensioner (mainly sprung/hydraulic one) in the wrong spot, it can't actually do anything about keeping the tension.
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By GabsReDeal · Posted
It was gonna take much longer for the 440cc so I'd thought I'd risk it with the 550cc. They finally arrived and I couldn't wait any longer (I could but I was quite excited after 2 months) and installed them myself. Removed the old injectors, inserted the new and connected everything up. Before starting the car, I tuned the injector size from the factory 270cc to 550cc using Nistune. This did some of the calculations automatically which catered for the TIM. The latency however did not seem to change. Deatschwerks have the tuning data available for each injector online, and I had a look at it. It has a table which relates to latency according to pressure and voltage (see below image). Nistune requires the 14v value, but I am unsure of which pressure value to look at (my lack of knowledge and experience have something to do with this). The highlighted value is close to my current latency which is 760µs. It is for 14v which makes sense, and the pressure is 31.6 Psi. I still gave the car a test drive to see how it goes, and honestly it has never felt so powerful before (and some people say the RB20DE is very weak?). I really enjoyed the drive. Side note; The injectors are quite noisy, which someone mentioned before. This does not really bother me however. I will still ask my mechanic to have a look at it and perhaps ask a tuner to fine tune it if they have the knowledge. -
Also true. But imagine not wanting new injectors? Imagine wanting to use 30 year old injectors?
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