Nitrous

[Billy Mild]

Can't you create 2 tunes with using the power key function? I would make it normal power would be Full timing, then when you click the key over to full power it would retard the timing.

[tpepmeie]

Originally Posted by Billy Mild

Can't you create 2 tunes with using the power key function? I would make it normal power would be Full timing, then when you click the key over to full power it would retard the timing.

No, because I presume you'd want to still have access to full power operation when off the bottle.

What I'd recommend is wire the window switch into an open input on the ECM and apply a spark retard when active. Alternatively, you could have the PT Open spark tables active when the window switch is closed (versus when the secondary bit is set). This becomes a lot easier if you don't have secondary throttles.

Note: the later calibrations have exactly this feature, although the tables are zeroed. The EBTCM sends a binary signal to the ECM, which then retards timing by a specified table amount. That was the secondary form of traction control (spark retard), the first being mechanical throttle modulation.

[Billy Mild]

I meant have both settings be "full power" where they would always open the secondaries, but one of the two power settings had retarded timing.

[Hib Halverson]

Originally Posted by tpepmeie

No, because I presume you'd want to still have access to full power operation when off the bottle.

What I'd recommend is wire the window switch into an open input on the ECM and apply a spark retard when active. Alternatively, you could have the PT Open spark tables active when the window switch is closed (versus when the secondary bit is set). This becomes a lot easier if you don't have secondary throttles.

Note: the later calibrations have exactly this feature, although the tables are zeroed. The EBTCM sends a binary signal to the ECM, which then retards timing by a specified table amount. That was the secondary form of traction control (spark retard), the first being mechanical throttle modulation.

Ah...good old Todd...always thinkin'

For almost as long as I've owned a ZR-1 I've always wondered why the LT5 TCS never used spark retard. The system was designed to be three steps.

1) Spark retard
2) TPS reduction
3) rear brake intervention at lower speeds only.

As Todd says, all the LT5 cals had that table zeroed.

It'd be pretty easy to use the shifter gun switch or whatever else you use for nitrous enable to control a relay whch would in turn switch a 5V signal to the ECM in place of the signal from the EBTCM.

Then you could just put, say...a 5° retard value in the the TCS table in the cal.

Lastly, on nitrous oxide rigs for LT5, while NOS may no longer sell the LT5 stuff, the guys who originally designed that system are back in business under a different name, Nitrous Supply. It's owned by Corvette nut and the founder of the original Nitrous Oxide Systems, Mike Thermos. 714-373-1986 is the ph. there.

[Billy Mild]

Originally Posted by Hib Halverson

Ah...good old Todd...always thinkin'

For almost as long as I've owned a ZR-1 I've always wondered why the LT5 TCS never used spark retard. The system was designed to be three steps.

1) Spark retard
2) TPS reduction
3) rear brake intervention at lower speeds only.

As Todd says, all the LT5 cals had that table zeroed.

It'd be pretty easy to use the shifter gun switch or whatever else you use for nitrous enable to control a relay whch would in turn switch a 5V signal to the ECM in place of the signal from the EBTCM.

Then you could just put, say...a 5° retard value in the the TCS table in the cal.

Lastly, on nitrous oxide rigs for LT5, while NOS may no longer sell the LT5 stuff, the guys who originally designed that system are back in business under a different name, Nitrous Supply. It's owned by Corvette nut and the founder of the original Nitrous Oxide Systems, Mike Thermos. 714-373-1986 is the ph. there.

What was special about NOS kit? Did it ja e a way to make it safer to run? Looks like the Zex kit already fits the bill.

[Hib Halverson]

Originally Posted by Billy Mild

What was special about NOS kit? Did it ja e a way to make it safer to run? Looks like the Zex kit already fits the bill.

Then buy the Zex kit.

[LGAFF]

nitrous bottle holder arrived as did window switch; also have 55, 65, 75 shot fuel/nitrous jets

[LGAFF]

Well I have all the parts

MSD Window Switch, Zex system with TPS switch, and a MDS DIS-4 Plus which will allow me to easily adjust timing in addition to providing few other protection features. Now I just need the time to install

I was able to get the DIS-4 cheap as it was a display model, the system uses part 8870 to sit between the coil housing and coils to control timing.

https://www.msdperformance.com/produ...ss/parts/62152

https://www.msdperformance.com/produ...ols/parts/8969
https://www.msdperformance.com/produ...ess/parts/8870