Guide: 1HZ - GTurbo + PDI intercooler + 3" exhaust

[veiloctane]

According to Gturbo, you don’t need it. They have a tuning guide all for the stock compensator for their turbos

Yes I have read there tuning guide. Basically set preload on the spring first. Then adjust the max fuel screw stab the throttle rpm should rise to 1100 and adjust back to 650rpm.

But I think spring rates can control how the fuel ramps up. Maybe you want the fuel to ramp up slowly. Or maybe faster. It might be able to be achieved with the factory spring. No way in finding out how it performs unless I have other springs to try out. And playing with the star wheel.

 

[Blomdala]

Yes I have read there tuning guide. Basically set preload on the spring first. Then adjust the max fuel screw stab the throttle rpm should rise to 1100 and adjust back to 650rpm.

But I think spring rates can control how the fuel ramps up. Maybe you want the fuel to ramp up slowly. Or maybe faster. It might be able to be achieved with the factory spring. No way in finding out how it performs unless I have other springs to try out. And playing with the star wheel.

He also has info on regrinding the ramp on the fuel pin as well. I would think if they recommended a larger travel length to utilize all the boost in the turbo, then they would definitely instruct that.

Just my own opinion! Other than extremely fine tuning a profile, the total travel length of the pin I don’t think matters as much, just adjusting the spring so that max PSI is at one end of the travel and 0psi is the other.

 

[veiloctane]

He also has info on regrinding the ramp on the fuel pin as well. I would think if they recommended a larger travel length to utilize all the boost in the turbo, then they would definitely instruct that.

Just my own opinion! Other than extremely fine tuning a profile, the total travel length of the pin I don’t think matters as much, just adjusting the spring so that max PSI is at one end of the travel and 0psi is the other.

I ain’t grinding my pin as it was already done by previous owner. And wasn’t done good as half the pin is gone. so I went with trundles pin.

 

[Blomdala]

I ain’t grinding my pin as it was already done by previous owner. And wasn’t done good as half the pin is gone. so I went with trundles pin.View attachment 3362444View attachment 3362446

That bottom half grind is just to get it in easier, no harm done. Just rotate is 180 degrees after inserting it to get on the normal ramp area.

Anyways, not saying you need to re grind it, just trying to share that an extra tall pin isn’t needed for full utilization based on how it works/ Gturbos instructions.

 

[KiwiDingo]

This pic has been getting around on here for years but it shows very clearly what needs to be done to get more fueling on stock aneroid. The follower pin with the stock profile only moves about 4mm in depth but it can actually move slightly more than 6mm giving a bigger range of compensation and more fuel.