Cadillac XLR Tuning LH2 V8 – Tune 5B PE Ramp
Today’s road test is a repeat of the previous test to add to the baseline for Tune 5. The only change from previous was to decrease the TUTD shift speed by 1 mph to 81, and to change the PE … Continue...
View ArticleCadillac XLR tuning LH2 Tune 5d Piston Protection AFR
The default XLR programming includes 0.5 AFR richer tuning at 6000 RPM to cool the pistons. Ideally there would be a timer associated with it — say after 10 min at 6000 RPM it added — but there is...
View ArticleCadillac XLR LH2 4.6L V8 Tuning — VVT Tune 6a-6c
One change for the Cadillac Northstar in the LH2 variant was the addition of variable valve timing. Today’s test is a slight change in the VVT timing on the intake and exhaust to see what impact on...
View ArticleCadillac XLR LH2 Tuning – Tune 6D Better is not always better
Today’s test Tune 6D was to keep the early VVT changes from Tune 6C with some late changes back from Tune 6B. I have also slightly modified my Virtual Dyno settings. Virtual Dyno uses barometer and...
View ArticleCadillac XLR LH2 Tuning VVT Tune 6E – MAF adj, Baseline
For Tune 6E I returned to Tune 6B, except I further corrected the MAF signal in high frequency to a smoother curve. Click to zoom in, back to return. Today’s run in blue, comparison best run 6B in red....
View ArticleCadillac XLR LH2 Tuning – Tune 7B Less Timing low, Lean
I am glad that I am running 2 tests on every setting now, as I am seeing some variability. [Click to zoom images, back to return] Tune 7B reduced the timing low, included some knock reserve where we...
View ArticleCadillac XLR LH2 V8 Tuning – More Tune 9a
Tonight I had cooler weather so I re-tested Tune 9a for baseline comparison. The 9A2 runs showed some KR spikes at 4150 rpm and 5000 RPM. This appears to relate to a high IAT advance multiplier at...
View ArticleCadillac XLR LH2 V8 Tuning – Tune 10a #HPTuners #Tuning #Cars
Tune 10a reduced the timing advance from Tune 9B across much of the range to sync up with the MBT timing in the appropriate cyl air ranges. That was the plan at least — it turns out I didn’t account …...
View ArticleCadillac XLR LH2 V8 Tuning – Tune 10B MBT
Tune 10B uses MBT values, adjusted for static retard and VVT adders, as the main spark table. MBT, or minimal timing for best torque, is a table that shows Cadillac’s calculated ideal timing. Often...
View ArticleVlog on #iPhone 6 Plus, @ProClipUSA #car mount in #Cadillac XLR
Video shot back into the XLR. Turning the air vents appeared to improve the audio. Unedited to show iphone on mount to youtube to you. iPhone runs out of storage and shuts video down abruptly at the...
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HPTuners, Delivered torque, Virtual Dyno, SC losses
I have been quoting delivered HP values in recent articles, and these are quick and easy to ref. This is a PCM calculated value that converts air flow to torque using air/fuel ratio and spark advance....
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Cadillac XLR Virtual Dyno calibration
Using my initial and second (premium) run data captured from HPTuners, I did some Virtual Dyno Analysis (see my initial Virtual Dyno article here). First I needed a new custom file for the XLR: I had...
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Cadillac XLR Top-up Testing
This evening I ran some top-up comparison tests to help calibrate and establish a baseline. Previously I had tested with the XLR top down, enjoying the convertible. I was focused on monitoring...
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Cadillac XLR & Virtual Dyno conventions
Another thought on this topic. My XLR got new tires along the way, and uses Michelin Pilot MXM4 tires, 235/50R-18. The calculated diameter for this size would be 27.3″ per Tire Size Conversion, or...
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Tuning the Cadillac XLR – MBT #Motorama @hptuners
Torque and horsepower are related, and if we increase torque everywhere across the RPM band, horsepower will go up as well. What we want to know is what timing or advance will give us the most power?...
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More Cadillac XLR baseline Virtual Dyno runs
Couple of quick runs today to gain more data to see what consistent results look like. The red and blue runs are both done today, from two different test locations. The green run is run 3 from...
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Cadillac XLR validating frontal area calculation
2009 Cadillac XLR I did a bit more work on frontal area, which appears to support the short-cut we took earlier. From a thread on Virtual Dyno on HpTuners, The quick way to calculate frontal area is...
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Cadillac XLR Virtual Dyno Testing 2015-08-28 #Motorama
I have been testing my 2007 Cadillac XLR with the LH2 4.6L DOHC V8 engine to establish a baseline prior to any mods or tuning. Today the air was a bit cooler, although not as much as I had hoped....
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Initial Tuning Steps Cadillac LH2 V8 Engine
First, I wanted to adjust the tune to recognize that we have E10, or gas with up to 10% ethanol. This gas has a lower stoichemic makeup, and an ideal ratio is 14.2:1 air:fuel instead of non-alcoholic...
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Cadillac XLR LH2 VVT V8 Tune 3
Noting that in Tune 2 the 5500+ RPM response in baseline was better, I adjusted the PE table for Tune 3 to return to 1.176 from 5500 RPM+, (12.5:1) and kept 1.148 below that point (12.8:1). So from...
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Cadillac XLR Volant Cold Air Intake Install and Test
Today I installed and tested a Volant Cold Air Intake p/n 25846150 for the Cadillac XLR. Install The install is pretty easy. A screwdriver is needed for the clamps, and a bit of WD40 or similar for...
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Cadillac XLR Volant Intake baselines
Today’s test was a repeat for baseline of the Tune3 with Volant air intake. Today’s test in Red, previous test in blue. What we see is that the two results are close, although the blue run has a...
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Cadillac XLR Tune 3 MAF Tuning & Tune 4
There are several things you don’t want to have happen when you are tuning a car: Tuning laptop crash Communication / connection / gadget problems Unintended tune changes Changing conditions I think I...
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Cadillac XLR Tune 5: Back to Basics, Glitches and All
If you are not getting the results you expect, reset and try again. Today I moved to Tune 5, which is the OEM calibration with only changes to TUTD shift, top speed, and MAF calibration for the...
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Cadillac CT6 and My Favorite Murder
One of my Wife’s birthday presents in August was a trip to see Karen Kilgariff and Georgia Hardstack from the My Favorite Murder podcast live when they were to be in Dallas. The PodCast live...
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