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vrracing · 03-05-2012, 10:50 PM

We tightened up the helper spring a bit. I had connected the air compressor with a hose-end regulator and a T feeding the WG actuator and the Zeitronix boost sensor. I tightened the helper spring until the boost gauge was showing ~14psi when the waste level maxxed.

Then we did a quick run with the HKS set to zero and in fourth it peaked a little over 6psi. So I dont think there is a reliable way to statically set the helper spring tension.

Then we set the HKS to 50% and in fourth reached a smidge over 12psi and it held to 11.4. This was going up a pretty steep hill.

Looks like we need to lean it out a touch.

The plots show a definite zigzag pattern. Is that the HKS boost solenoid cycling on and off or just noise?

Should we tighten up the helper spring some more so that the HKS doesnt have to work so hard? Or does that matter? I recall seeing on another site while researching helper springs that people were concerned about the duty cycle of their EBCs.

btw, we have an NA 5-speed gauge cluster which has an 8k redline. Was the S5Tii redline 7k like the S4s?

Thx

03-05-2012, 10:50 PM	#27
vrracing Rotating Assembly Join Date: Oct 2008 Location: TX Posts: 102 Rep Power: 17	We tightened up the helper spring a bit. I had connected the air compressor with a hose-end regulator and a T feeding the WG actuator and the Zeitronix boost sensor. I tightened the helper spring until the boost gauge was showing ~14psi when the waste level maxxed. Then we did a quick run with the HKS set to zero and in fourth it peaked a little over 6psi. So I dont think there is a reliable way to statically set the helper spring tension. Then we set the HKS to 50% and in fourth reached a smidge over 12psi and it held to 11.4. This was going up a pretty steep hill. Looks like we need to lean it out a touch. The plots show a definite zigzag pattern. Is that the HKS boost solenoid cycling on and off or just noise? Should we tighten up the helper spring some more so that the HKS doesnt have to work so hard? Or does that matter? I recall seeing on another site while researching helper springs that people were concerned about the duty cycle of their EBCs. btw, we have an NA 5-speed gauge cluster which has an 8k redline. Was the S5Tii redline 7k like the S4s? Thx __________________ 90 S5 Vert. JDM Tii with BNR Stage1 turbo. Pineapple Racing street port. Bonez cat-forward. Corksport cat-back with Vibrant UltraQuiet resonator. RTek 2 wZeitronix w/b. HKS EBC. Vis CF Tii hood. 3000GT wing. Ground Control coilover kit with KYB AGX shocks. Red and Black leather RX8 seats. Corksport Odura lip & bumper caps, OEM Tii skirts Last edited by vrracing; 03-05-2012 at 11:16 PM.