StealBlueSho
SHO Member
How much boost are you 2010-2012 LMS guys seeing sustained in 3rd gear with with the 4+X tune?
Sent from my Nexus 6P using Tapatalk
Sent from my Nexus 6P using Tapatalk
LMS 4+X Boost
- Thread starter StealBlueSho
- Start date
Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
Bruce is spot on. There may be times that your TQ MGT system will command 15 to MAYBE 16, but for the most part logic will calculate a 14-14.9 max.
StealBlueSho
SHO Member
Interesting.. I have a call into Anthony.. I hooked up my SCTx4 to see what kind of boost and 0-60 times your 4+X was producing.. Spikes at 205kpa (15.2PSI)and sustained at 185kpa(12.3psi)... Not sure that was normal or not, seemed a bit low from what I was reading online...
I have never watched my gauge continually from the time it shifts to 3rd until it shifts to 4th. I try to watch the road or track at that speed and just take glances at the boost and temp readings. 
Also, I am not measuring boost with a mechanical gauge. I use an Aeroforce gauge that takes info from the OBD port so I will defer to the folks at Livernois for a better answer. I can tell you that the 4+X/3 bar tune does seem to run about 2 PSI higher than the 4+/2 bar tune based on my gauge.
Of course, boost isn't everything. I have always liked the balanced approach to tuning rather than just raising the boost to ultra high levels.
Also, I am not measuring boost with a mechanical gauge. I use an Aeroforce gauge that takes info from the OBD port so I will defer to the folks at Livernois for a better answer. I can tell you that the 4+X/3 bar tune does seem to run about 2 PSI higher than the 4+/2 bar tune based on my gauge. Of course, boost isn't everything. I have always liked the balanced approach to tuning rather than just raising the boost to ultra high levels.
StealBlueSho
SHO Member
Yea, I happen to have a SCTx4 as well so I datalogged a few pulls... The boost is relatively low compared to other tunes I have seen.. but I will tell you, the IAT going pass the TIP are MUCH MUCH cooler with the lower boost.. which is probably what allows the car to run the timing they are requesting and keep things cool under the hood. Colder IAT's = Less chance for detonation.
It is an interesting approach, the car has a very smooth power band with no radical load spikes so make it jump at shifts... it will be interesting to see what the 0-60 times and 1/4 times are verse the other tunes I have...
I will say this though...based on the logs, from an AFR and Fuel Pressure stand point, its probably one of the safest tunes I have seen, I wouldn't think twice about running this tune in negative degree weather IMHO... Lets just see if that equates to wins at the track/street though
I did get walked by a 2013 CTS-V Coupe (it wasn't stock based on the exhaust) the other day with this tune.. I had him from a roll (sucks for us to start that way) starting at 20mph through about 70mphs.. pulled about 1/2 car initially but in the upper RPM's he inched up to me... and then started to inch by me after 70mph.. which was the start of 3rd gear...
EDIT: Not that I am upset about that... those are rated at 556hp and 551tq... 4.1 0-60 and 12.3 1/4 mile times...
It is an interesting approach, the car has a very smooth power band with no radical load spikes so make it jump at shifts... it will be interesting to see what the 0-60 times and 1/4 times are verse the other tunes I have...
I will say this though...based on the logs, from an AFR and Fuel Pressure stand point, its probably one of the safest tunes I have seen, I wouldn't think twice about running this tune in negative degree weather IMHO... Lets just see if that equates to wins at the track/street though
I did get walked by a 2013 CTS-V Coupe (it wasn't stock based on the exhaust) the other day with this tune.. I had him from a roll (sucks for us to start that way) starting at 20mph through about 70mphs.. pulled about 1/2 car initially but in the upper RPM's he inched up to me... and then started to inch by me after 70mph.. which was the start of 3rd gear...
EDIT: Not that I am upset about that... those are rated at 556hp and 551tq... 4.1 0-60 and 12.3 1/4 mile times...
Last edited:
Large displacement+positive displacement. You gotta use that AWD against those guys lol.
Like we have noted several times, more boost will always equate to more heat. The EB platform as a whole already has a PHD in heat creation. We choose to keep boost relatively low and use engineering to make power.
To monitor on your own, doing so mechanically is going to be more accurate than VIA the OBD route. I will save the entire forum the dissertation on logging, but if you have to see needles and gauges that is the best way without selling a kidney for insane monitoring equipment like we have.
Like we have noted several times, more boost will always equate to more heat. The EB platform as a whole already has a PHD in heat creation. We choose to keep boost relatively low and use engineering to make power.
To monitor on your own, doing so mechanically is going to be more accurate than VIA the OBD route. I will save the entire forum the dissertation on logging, but if you have to see needles and gauges that is the best way without selling a kidney for insane monitoring equipment like we have.
StealBlueSho
SHO Member
Not arguing analog data scavenging vs digital... no where near... I can only use what I have available
The resolution on the SCTx4 may not be 100% accurate, but its better than nothing lol!Similar threads
