S4 (Stage 4) Temperature

[tom1l21]

What is the temperature the engine must be to get into stage 4 and to allow for gliding with no engine revolutions? I have heard temps for S4 to be 157F, but at that temp on my ScanGauge, the engine will still run when trying to glide. I even used the xgauge engine temp for this. What is the target temp and how do you display it on the SG? Thanks!

[TheForce]

Its actually about 70C or around 157-159F. I always shoot for 159F minimum.

[Matt Herring]

I also use the 159 degree mark as my hurdle for EV but recently with the lower temps I have noticed I am needing around 162 degrees on my SGII to capture EV.

That being said, when I get into EV in the 160 degree range there is some cooling that occurs at current ambient temps while in EV so I have to get back up to temp afterwords to use it again.

On my commute to work there is a long downhill that I usually get into EV at the crest (about 3/4 mile from my house) and I'll usually do an EV neutral coast to the bottom and beyond. After that coast I'm at about 155 degrees so a small amount of ICE is necessary to get back up to temp over the next couple small hills before getting back into EV on the next long flat/slightly downhill stretch.

[efusco]

According to CAN-View, 157F is my consistent threshold. Remember that you must do the idle check to enter S4 (full stop, with engine running, for about 7 seconds and until the ICE shuts down).

[tom1l21]

Originally Posted by efusco

According to CAN-View, 157F is my consistent threshold. Remember that you must do the idle check to enter S4 (full stop, with engine running, for about 7 seconds and until the ICE shuts down).

I'm not quite sure I understand this explanation.

If I read an engine temp of 150F on my SG (engine temp xgauge) and decide to accelerate from say from 10mph to 35mph and in doing so, I reach 165F on my ScanGauge, will I be able to take my foot off the accelerator and then feather back on the accelerator to glide? I'm not quite sure what you mean by full stop for 7 seconds. I hope you didn't think I meant going into EV mode (I don't have that installed) which I would imagine you would have to come to a stop to engage it.

[efusco]

Originally Posted by tom1l21

I'm not quite sure I understand this explanation.

If I read an engine temp of 150F on my SG (engine temp xgauge) and decide to accelerate from say from 10mph to 35mph and in doing so, I reach 165F on my ScanGauge, will I be able to take my foot off the accelerator and then feather back on the accelerator to glide? I'm not quite sure what you mean by full stop for 7 seconds. I hope you didn't think I meant going into EV mode (I don't have that installed) which I would imagine you would have to come to a stop to engage it.

Yes, at 165F (or 157), when you hit any speed b/w 42mph and 35mph you can feather off into a glide...but you are NOT in S4 at that point...I think that's S3b or something.

If, after getting up to 157F you come to a full stop, with the ICE running, the wait for the idle check/ICE shut down, you are THEN in S4 and will be able to feather into a glide from ANY speed below 42mph (Gen II), not just b/w 42 and 35mph.

[tom1l21]

Originally Posted by efusco

Yes, at 165F (or 157), when you hit any speed b/w 42mph and 35mph you can feather off into a glide...but you are NOT in S4 at that point...I think that's S3b or something.

If, after getting up to 157F you come to a full stop, with the ICE running, the wait for the idle check/ICE shut down, you are THEN in S4 and will be able to feather into a glide from ANY speed below 42mph (Gen II), not just b/w 42 and 35mph.

Ahh thanks for clearing that up. In stage S3b, I take it the engine is just spinning while you try to glide?

[Matt Herring]

I do the stop for several seconds process once in awhile when I accidentally trip ICE in EV. On my commute home I have 1/4 mile of driving to get through my living community and if I trip the ICE I just pull over...wait for ICE to shut off...then continue my EV driving to the parking location.

I don't trip the ICE often during this 1/4 mile stretch...maybe 1 out of every 20 times...but if you're limping home on EV with 3 bars and apply too much pressure to the GO pedal it's easy to trip the ICE vs. 4-6 bar operation. The several second stop process to shut down ICE is a handy little trick to conserve mpg.

[tom1l21]

My engine temp was at 172F when I came upon a red light. After waiting for 20 seconds, I accelerated off and tried gliding which didn't work. I then came to another red light at 180F 15s down the road and again waited for 30s. After accelerating, I was able to glide. How come I wasn't able to at the first red light?

[efusco]

Originally Posted by tom1l21

Ahh thanks for clearing that up. In stage S3b, I take it the engine is just spinning while you try to glide?

b/w 35-42 you can have a true ICE-off glide. If you try to enter a glide at less than 35mph in S3b the ICE will continue to run.