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Bruce Nunnally is an independent Blogger who writes Cadillac Conversations on all things Cadillac. Connect with Bruce on Google+

Cadillac XLR LH2 V8 Tuning – More Tune 9a

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Tonight I had cooler weather so I re-tested Tune 9a for baseline comparison.

XLR Tune 9A2 Comparison Calc HP

The 9A2 runs showed some KR spikes at 4150 rpm and 5000 RPM. This appears to relate to a high IAT advance multiplier at those RPMs, which I will zero out for Tune 9B.

XLR Tune 9a2 to 9a comparison

The Virtual Dyno for 9a2 was equivalent to 9a1, which is good news (same tune, different day).

Tune 9B will also reapply the MAF 2% touch up around 8,000 hz since there are some signs of running lean there.

XLR Tune 9A2-0139 HPTuners

The issue of KR due to multiplied IAT advance at lower temps could be why the XLR has consistently run better at high temps (which is counter-intuitive). In the next tune I will change the multipliers below 6000 RPM/below 104F for IAT advance to 0. The alternative would be to zero out IAT advance adders at cooler temps, but there may be some value in keeping them at higher RPMs.

Because the KR doesn’t go up at higher RPM it may be false knock?

Sunny SRX September highlights Cadillac Sales

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The Cadillac SRX continued to bloom well for Cadillac, leading all models.  ATS sales held even, although still well below target.   XTS and CTS sales continue to flutter along.   Even the ELR was less than its normal 100ish at 36, perhaps a victim of ongoing low gas prices.

  September (Calendar Year-to-Date)
January – September
  2015 2014 %Change Volume   2015 2014 %Change Volume  
ATS 2,295 2,239 2.5   18,839 22,535 -16.4  
CTS 1,319 2,282 -42.2   14,253 22,921 -37.8  
ELR 36 111 -67.6   740 885 -16.4  
Escalade 1,628 2,290 -28.9   14,977 13,705 9.3  
Escalade ESV 1,181 1,228 -3.8   10,153 7,647 32.8  
Escalade EXT 0 0 ***.*   2 50 -96.0  
SRX 6,849 3,700 85.1   50,712 41,708 21.6  
XTS 1,600 1,979 -19.2   16,023 18,386 -12.9  
Cadillac Total* 14,908 13,829 7.8   125,699 127,837 -1.7  

Summary

SRX total sales were up 85%, and retail sales were up 56%, so a good number went to rental fleets?

The Cadillac Escalade and Escalade ESV have a 31 percent share of the retail market for large luxury SUVs.

GM and Cadillac continue to minimize incentives and keep average transaction prices high, which in the long run will help brand value and vehicle resale value.