COS5 N20 Settings??

[BowlingSS]

This has some important info... stickied.

Good idea joecar....

[jermstyle]

I know it's late - but the documentation actually says to set A0012 and A0013 to MAX VALUE. So just set these to same value as H0109 and you're good.

[BowlingSS]

I know it's late - but the documentation actually says to set A0012 and A0013 to MAX VALUE. So just set these to same value as H0109 and you're good.

BE SURE TO SET A0012 and A0013 (valet mode speed) to zero or else the timing retard will not work!!!

[Highlander]

Hi Bill

You can also just run the ground to pin 56 with a second relay from the Nitrous arming switch...saves having multiple switches.

Why would you need a separate relay? What would be the best way for the system to arm at the same time as the PCM?

[5.7ute]

Why would you need a separate relay? What would be the best way for the system to arm at the same time as the PCM?

Using a second relay that earths pin 56 only when the nitrous solenoids are activated allows the pcm to pull timing, add fuel only when spraying. This method has worked fine for me over the last year and at least 50 passes.

[Highlander]

i know about the PCM control, i was refering about the wiring perse... i thought the SAME relay from the switch provided such input... or the switch perse... depends on how you wire it...

[5.7ute]

i know about the PCM control, i was refering about the wiring perse... i thought the SAME relay from the switch provided such input... or the switch perse... depends on how you wire it...

The arming relay, even when used on the ground side of the solenoids may still have some voltage that could harm the PCM.( I am no electrical engineer so cannot say this for a fact)
To be safe I thought it best to use a seperate relay.

[VYSSLS1]

ok guys heres a little information, a while ago now, i actually rang Paul from EFILive to up the multiplier tables to 3.0 as they were only 1.3 years ago, and i couldnt get enough fuel to flow whilst on NOS.

As a good guide, this is how ive tuned many NOS cars including my own, If running a dry shot, and using big injectors, run car at approx 12.8AFR Naturally Aspirated, Arm the NOS system, with NOS bottle turned OFF, depending on NOS shot eg 200hp aim for 10.4 AFR, making sure timing retard is working correctly, run car in closed loope for approx 5 minutes, to clean spark plugs after a extreamly rich mixture.

Heat bottles to 1180psi using an accurate pressure guage, and carry out test on dyno with NOS Bottles turned on. I personally find with a 10.2 to 10.4 AFR with a 200hp NOS shot, AFR will rise to approx 11.8-11.9AFR with the NOS bottles turned on. Just remember this is a guide only. Make sure you have 2 degrees retard for every 50hp of NOS at a minimum.

Just remember this is a guide on what i find, others may find different. Depending on fuel system and Injectors used.

[427]

ok guys heres a little information, a while ago now, i actually rang Paul from EFILive to up the multiplier tables to 3.0 as they were only 1.3 years ago, and i couldnt get enough fuel to flow whilst on NOS.

As a good guide, this is how ive tuned many NOS cars including my own, If running a dry shot, and using big injectors, run car at approx 12.8AFR Naturally Aspirated, Arm the NOS system, with NOS bottle turned OFF, depending on NOS shot eg 200hp aim for 10.4 AFR, making sure timing retard is working correctly, run car in closed loope for approx 5 minutes, to clean spark plugs after a extreamly rich mixture.

Heat bottles to 1180psi using an accurate pressure guage, and carry out test on dyno with NOS Bottles turned on. I personally find with a 10.2 to 10.4 AFR with a 200hp NOS shot, AFR will rise to approx 11.8-11.9AFR with the NOS bottles turned on. Just remember this is a guide only. Make sure you have 2 degrees retard for every 50hp of NOS at a minimum.

Just remember this is a guide on what i find, others may find different. Depending on fuel system and Injectors used.

Damm -

why the big bottle pressure

You dont feel once it hits 10.2-10.3 afr the plugs are shot?

[5.7ute]

Damm -

why the big bottle pressure

You dont feel once it hits 10.2-10.3 afr the plugs are shot?

Following Brad's (VYSSLS1) advice a year or so ago when I set up my dry shot it only took a small tweak to get the AFR where I wanted it when spraying. Mind you I only run a 150 shot at 1050psi bottle pressure.
Having the AFR run at around 10.2 for a pass had no adverse effects on the plugs which had cleaned themselves up by the time I returned to the pits.