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My guess would be the XLR was 'blessed' with the exhaust setup from the Vette which is not ideal. No idea if the intakes were the same or not -- I think we could examine the diagrams and see if there is something radically different there.

I think I looked at that in my calibration and the throttle was already immediately at 100% -- no ramp in on the opening rate. You can reprogram the throttle so current 25% the engine sees as 35% or similar, but why not just press down further when you want more throttle?

I have seen some air ducting or 'funnel' mods that help get air directed to the filters on other cars. The factory engineers would not use the volant approach due to the chance of water intake while driving in a heavy rain -- I suspect it is not up to 'spec' in that regard. I am mostly...

I would not expect top up/down to have a significant effect on air flow to the engine -- the top is downstream of the airflow relative to the air intake so to speak. If the XLR was more powerful with the top down that would make me smile though.

Thanks for the link to the performance thread. My undercar valance and skirting appear to be okay. With the air at 95F+ everything is going to be hotter than that cooling medium most of the time. Interesting that the air in through the Volant actually showed 2F cooler than ambient (99F...

Thanks. It would be a lot easier with a huge garage and a chassis dyno. I do like that I think most people have the ability to replicate the type of testing I am doing. New post for the Volant intake install & test is up. Next I believe will be more baselines with the air intake, then...

I am starting to experiment with basic tuning for the LH2 V8 engine in my "new" 2007 XLR using data captured from hptuners and Brad Barnhill's Virtual Dyno. Unfortunately due to lack of a handy runway I am doing my Virtual Dyno runs in 2nd gear, so not directly comparable with a chassis dyno...

Finally got the bank check in hand and the XLR bought. Nice sunbeams to celebrate the homecoming.

As it turns out, found a local 2007 Blue XLR and reached agreement on it. Here is a shot next to my STS-V from our test drive this morning. Waiting on a bank check to arrive to close the deal, but out of the market.

I hope so; I kept thinking a 50s or 60 Cadillac convertible but the XLR is likely easier to keep going a bit, and if it is a weekend car should only get a few K miles a year, but we'll see.

I am actively shopping for a low-mile Cadillac XLR-V in excellent condition as a weekend car. I am located in Plano near Dallas, Texas but can travel for the right XLR-V & deal. If you have a V you might consider letting go to a good home please let me know details about the car...