[pocholin]

I'm curious your experiences in 4th gear. I have tracked my T6 S60 and logged OBD2 data, simple throttle angle and boost. It's very obvious that there is programmed in power limiting 4th gear and up at WOT. Solid 22psi goes to a sort of bouncing around of the throttle angle and boost while my foot is WOT on the pedal as you might expect on the track. I assume there is a torque target as typical engine control strategy. throttle and boost are manipulated to meet that target. You can see here, on the front straight, shift to 4th about 80mph.

Probably a good compromise for Volvo for longevity, most people aren't going to care about WOT over 80, the upper gears are a lot of load. It's noticeable though on the closed course where you got space to run!

Yes, I can see that once it shifts into 4th gear your turbo only sees 18PSI max (once early in the range) and 17PSI max in the higher range, along with the throttle angle being all over the place. Comparing to my log files, turbo fluctuates between 20, 21 and 22 PSI, going back and forward a couple of times in the entire rage (4300-6050 RPM). This is under RC Map7. Similar behavior under Map4...I'm still trying to take a better log under map4 (hard to find a safe place to keep it in 4th gear). My throttle position is all over the place through the range on both maps.

By what you're saying, it doesn't seem the car (under stock conditions) is pulling timing, but controlling the turbo pressure under a certain level (18 PSI max), do you think it does it by puling timing or by throttle position?. I'm observing the same behavior under RC, we've been referring to it as "the car is pulling timing", but is it??

 

[Power6]

By what you're saying, it doesn't seem the car (under stock conditions) is pulling timing, but controlling the turbo pressure under a certain level (18 PSI max), do you think it does it by puling timing or by throttle position?. I'm observing the same behavior under RC, we've been referring to it as "the car is pulling timing", but is it??

We're speculating because I don't think we can monitor timing advance at least I got no mfr specific codes for Volvo with the Kiwi I have but that's not surprising. Not knowing the tables and correction that feeds into it as well. Given that I don't think timing is playing into it. I think timing as power control has gone out of favor with DBW throttle, it's an easier way to manage it. Timing obviously still having an effect, as to the current conditions with knock detection and long term trim to account for fuel quality. This is based off what I have seen with other fairly modern cars (mostly Subaru) where the stuff is there for an end user to view and modify the tables in the engine programming so you get an idea how it works. Pushing the throttle pedal puts a "torque request" input and the ECU program figures out the throttle angle and then boost etc to get there.

I have been working with Hilton tuning to tune my car, which may or may not be possible (need to verify my ECU hardware) they have done some of these so some knowledge is there, but closed and proprietary.

 

[Dyno]

For what it's worth, I agree with Power6. I don't know the Volvo software specifically, but I do know that in most strategies, the pedal requests a specific torque, and then boost and throttle are manipulated in an attempt to achieve the desired torque.

Pulling timing is used to control knock, not to reduce power per se, although you can see it reflected in measured torque or acceleration rate. One big downside to pulling timing long term is that it drives the exhaust temperatures up, and there are hard limits on how high you can go. That's why you don't want to rely on it to control torque.

Boost is controlled by a wastegate, and they don't call it a WASTEgate for nuthin. When that gate is open, a lot of energy in the form of hot exhaust gas is essentially thrown away. Thus, it can be more efficient to simply close the throttle down a little.

When you've been WOT for a long time (e.g. in 4th gear at the end of a straight) the turbo has had plenty of time to reach it's steady-state RPM, and thus the throttle may need to step in and play a larger role.

All of the above is just speculation on my part.

 

[majic]

Is this thread dead coz I just got my RaceChip GTS and was going to install it this weekend on top of the Polestar for the xc90t6🤣

 

[pocholin]

Is this thread dead coz I just got my RaceChip GTS and was going to install it this weekend on top of the Polestar for the xc90t6[emoji1787]

Lol, it isn't dead. Let us know how it goes, I'm still enjoying it.

I finally did the comparison of map7 vs map4 y haven't had a chance to do the virtual dyno. I should post results this weekend

Sent from my XZ2 Compact using Tapatalk

 

[majic]

So you are just living with the engine light from time to time? I wish I bought the Viatrix one if i knew before. But they sold out atm anyways. Has anyone gotten Hilton for these t6s yet? He doesn't mention on site what the upgrades would be with his service.

 

[pocholin]

So you are just living with the engine light from time to time? I wish I bought the Viatrix one if i knew before. But they sold out atm anyways. Has anyone gotten Hilton for these t6s yet? He doesn't mention on site what the upgrades would be with his service.

Funny you mention, I hadn't gotten one for a long time, then I got the Polestar and started getting some. I've reset the ECU and went back to the connections to ensure they're well tighten, I got the engine light once about 500 miles ago but let the car cycle it out, instead of me clearing it. You might want to try un-plugging and re-plugging your 4 connectors.

 

[pocholin]

Thanks.

The blue line is map 4, correct? If so, there's definitely more power produced "under the curve" (without the ECU pulling timing).

Well, this week's run, on 4th gear, same surface for both runs (consciously matching elevations), shows map4 indeed making just a little less HP and torque.

 

[lamarguy]

Well, this week's run, on 4th gear, same surface for both runs (consciously matching elevations), shows map4 indeed making just a little less HP and torque.

What was the ambient temp? Overdriving the supercharger with cold intake air may balance out the heat addition.

 

[pocholin]

What was the ambient temp? Overdriving the supercharger with cold intake air may balance out the heat addition.

Ambient temp SAS 55F, as shown on the image. I had driven ~25 miles at a very conservative way until the moment of the two runs I made, so i really don't think heat soak was an issue. I will try again on Tuesday, my first pass will be on map 4, then map 7 hay to ensure map 4 gets a chance first.

Sent from my XZ2 Compact using Tapatalk

 

[lamarguy]

Ambient temp SAS 55F, as shown on the image. I had driven ~25 miles at a very conservative way until the moment of the two runs I made, so i really don't think heat soak was an issue.

I was referring to the prior run, made a month or so ago, where Map 4 showed more power under the curve and now Map 7 is showing slightly more power under the curve. I think a lower ambient temp may explain the difference.

 

[pocholin]

I was referring to the prior run, made a month or so ago, where Map 4 showed more power under the curve and now Map 7 is showing slightly more power under the curve. I think a lower ambient temp may explain the difference.

I think back then I did the map 4 run coming down from a long overpass bridge where it benefited from a down hill faster acceleration. That's why I mentioned that this time I consciously ensured surfaces matched for both runs.

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[pocholin]

I think back then I did the map 4 run coming down from a long overpass bridge where it benefited from a down hill faster acceleration. That's why I mentioned that this time I consciously ensured surfaces matched for both runs.

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Temperature back then was 44F, but accounted for on the SAE adjustments.

 

[majic]

Well Installed my GTS RaceChip. Drove it about 50km on map 4 and 5 before I switched to 6 and then 7, definitely felt more power no more then 50hp at crank from butt dyno, but on 7 I noticed unstable power surge on low rpm. Not like we shud be driving on map 7 everyday, I'll only turn it on when someone wants to get their jdm ass whooped. Will do Hwy drives tomorrow and report back.

 

[lamarguy]

Temperature back then was 44F, but accounted for on the SAE adjustments.

Based on your real world data and prior dyno results (Vaitrix), is there consensus that Map 4 (GTS) or Map 3 (S, RS) is the upper limit without overdriving the supercharger?

 

[pocholin]

Based on your real world data and prior dyno results (Vaitrix), is there consensus that Map 4 (GTS) or Map 3 (S, RS) is the upper limit without overdriving the supercharger?

At least from Racechip, I'd say yes. Max boost remains at 22.62 under Map4 or Map7, which is the same I see under Stock configuration, except that the more aggressive the map the faster it makes the car achieve max boost.

 

[pocholin]

Well Installed my GTS RaceChip. Drove it about 50km on map 4 and 5 before I switched to 6 and then 7, definitely felt more power no more then 50hp at crank from butt dyno, but on 7 I noticed unstable power surge on low rpm. Not like we shud be driving on map 7 everyday, I'll only turn it on when someone wants to get their jdm ass whooped. Will do Hwy drives tomorrow and report back.

The "unstable power surge" you're feeling is the ECU throttling down the car to decrease the boost, then RC making up for it. In my record log I can see the Throttle position jumping all over while the boost pressure is steadily kept at 22.62589 PSI

My daily driving is on Map5, I do Map7 only for when I want "max" performance, no check engine lights for the past 2 months.

 

[pocholin]

So you are just living with the engine light from time to time? I wish I bought the Viatrix one if i knew before. But they sold out atm anyways. Has anyone gotten Hilton for these t6s yet? He doesn't mention on site what the upgrades would be with his service.

I wanted to follow up with you on this topic. First, make sure your plugs are very well secured. I have noticed that I only get the check engine light when I use Eco mode. For the past 4 weeks I haven't gotten the engine light driving on Comfort or Polestar. What has your experience been?

 

[Power6]

To follow up on Hilton, they are thin on information online but Rob seems like a great guy and a good reputation. A remapping of the ECM is always going to have way more capability than messing with a couple sensor inputs. Unfortunately Volvo updated the ECM hardware in the SPA in 2019. My S60 has the updated ECM which has not been "cracked" yet so Hilton is unable to tune it yet. He's going to keep me posted. If you have a 2017-18 they can tune it.

 

[pocholin]

To follow up on Hilton, they are thin on information online but Rob seems like a great guy and a good reputation. A remapping of the ECM is always going to have way more capability than messing with a couple sensor inputs. Unfortunately Volvo updated the ECM hardware in the SPA in 2019. My S60 has the updated ECM which has not been "cracked" yet so Hilton is unable to tune it yet. He's going to keep me posted. If you have a 2017-18 they can tune it.

I can't find the info you provided on this tune, can you re-post it?

RC has provided a quick and economical way to get more power out of the car...but I do agree with you that a tune is going to be more capable at optimizing several parameters and getting the most.