Camaro XV

[formula88]

Here's a video from the final road course session (about 1/3 into it).

It gets really wild about two minutes in .

Some really sweet driving by all and a great perspective on how hard these guys track their cars.

[ccracin]

OH MY GOOD GRACIOUS! My office chair was all over the place watching that. I was on the binders way before Mark. And that's just watching the video! LOL Thanks for posting that video, it made my afternoon!

[Sonar Chief]

I was thinking the same thing there .... except my heart was pumping lots, and looking in the mirror there Mark is calm and in control. WOW


Thanks for posting .... I could waist a whole day watching Mark take the fastest line!!!!

[66tintop]

That was an awesome video, could only imagine how well it would work with racing slick tires ! Thanks for sharing ! It sure seems like it pulls like freight train ! Wow !

[formula88]

Originally Posted by ccracin

OH MY GOOD GRACIOUS! My office chair was all over the place watching that. I was on the binders way before Mark. And that's just watching the video! LOL Thanks for posting that video, it made my afternoon!

LOL... I know what you mean. I was watching this last night on the big screen and found myself leaning into each turn!

[mikels]

Originally Posted by Vince@MSperfab

Its common on RPM-MAP based ecus in race applications for the lowest MAP bins to be set at the max vacuum that you can pull while opening the throttle quickly. When you quickly close the throttle quickly at high-load, high-rpm, you can often get the MAP to dip below that value and it will cause a rich condition that produces popping and flames. You can tune it out by spreading out your MAP bins, but it will lower the resolution of your fuel tables in the normal operating range and hence isn't usually done in race applications.

Controller is GM E67 and is using MAF primary control with parallel speed-density control. So I have seen what you are speaking of, but this is slightly different.

Flames are result of how quickly ramp out of PE (power enrichment) combined with spark control when transitioning from on throttle to off throttle to DFCO (de-acceleration fuel cut-off).

Non-issue from an engine standpoint - from a visual, well, it barks flames on lift-throttle transitions from high airflow.

While there are many changes I can make that could reduce this effect, we haven't had time to revisit cal since last development trips to Gingerman and now OUSCI. That and some of those potential changes would be undesirable such as how quickly power drops when reducing accelerator pedal (@ 950hp, when you lift, you likely really want to reduce power.....)

Mark and I were talking that we've reached point where more power is not likely to result in much improvement of lap times (never thought I'd say that.....). Ability to maintain fluid temps at this power level has been a challenge as well - but Mark is now able to run 20 minute sessions in any ambient with controlled temps and no drop in delivered power.

First 7.0L supercharged engine (for road racing) we did at Thomson's in 2009 made 780hp/830tq. We are now at 950hp/970tq (1010hp/1020tq on E85). Amazing what refinements can bring paying attention to the details.

Dave

[ccracin]

Originally Posted by mikels

Controller is GM E67 and is using MAF primary control with parallel speed-density control. So I have seen what you are speaking of, but this is slightly different.

Flames are result of how quickly ramp out of PE (power enrichment) combined with spark control when transitioning from on throttle to off throttle to DFCO (de-acceleration fuel cut-off).

Non-issue from an engine standpoint - from a visual, well, it barks flames on lift-throttle transitions from high airflow.

While there are many changes I can make that could reduce this effect, we haven't had time to revisit cal since last development trips to Gingerman and now OUSCI. That and some of those potential changes would be undesirable such as how quickly power drops when reducing accelerator pedal (@ 950hp, when you lift, you likely really want to reduce power.....)

Mark and I were talking that we've reached point where more power is not likely to result in much improvement of lap times (never thought I'd say that.....). Ability to maintain fluid temps at this power level has been a challenge as well - but Mark is now able to run 20 minute sessions in any ambient with controlled temps and no drop in delivered power.

First 7.0L supercharged engine (for road racing) we did at Thomson's in 2009 made 780hp/830tq. We are now at 950hp/970tq (1010hp/1020tq on E85). Amazing what refinements can bring paying attention to the details.

Dave

The development you guys have put into this package is fantastic. Your work and attention to detail is very evident!

Your statement above is all the motivation needed to do an AWD 69! Hint Hint Nudge Nudge Wink Wink!

[Sieg]

Originally Posted by formula88

Here's a video from the final road course session (about 1/3 into it).

It gets really wild about two minutes in .

Some really sweet driving by all and a great perspective on how hard these guys track their cars.

Dog Fights!







This photo was taken at about 5:20 on the video, quick heavy application of mid-range throttle.

[WSSix]

So how did Mark do overall at the event?

[SSLance]

Originally Posted by formula88

Here's a video from the final road course session (about 1/3 into it).

It gets really wild about two minutes in .

Some really sweet driving by all and a great perspective on how hard these guys track their cars.

That... was... Awesome...

Thanks for posting. Really nice driving by Mark in an obviously very well prepared car.