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    PTG finishes 3rd and 4th at Lime Rock Park

    Their M3s are the only cars in the series to have ABS, likely to level the tough GT2 class.

    http://www.ptgracing.com/press_relea...6/07_01_06.htm


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    Hallen
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    Re: PTG finishes 3rd and 4th at Lime Rock Park

    Auberlen is just a genius in these cars. Marks is pretty much there too. The team has the drivers. Now it looks like they are getting a competitive car under them.
    I am looking forward to watching them in Portland.

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    ABS helps but Lime Rock is a momentum course

    and the team and partners have done a great job getting the handling/grip/driving down. Yokohama tested and built a new tire with great results and the new JRZ'z are coming together. Portland will be tough because the rules and the current BMW engine choices leave a bit of power on the table to Porsche and Panoz. Portland's got alot of long straight into slow corners with critical acceleration demands (erad: need torque and HP).

    Look for more great things though, they're working hard!

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    Hallen
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    What are JRZ's?

    I think of Portland as a bit more of a momentum track. Turn 12 onto the front straight demands a good handling car to get good speed down the straight. The combinations of turns 4-7 are also more of a handling section leading onto the back straight. I am not a driver and have never driven the track myself, but it seems like more of a handling track, especially with the slick pavement. The turn three exit is the only place I can think of where low end torque is going to be a big advantage.

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    Most teams can set their cars

    JRZ Suspension Engineering is the shock absorber company that designs and builds the shocks for the cars.

    The M3's are a bit down on power and torque compared to the others...at the moment.

    to do well in the corners leading onto critical straights. For Portland, its a drag race down the fron stretch to heavy braking into the festical corners and heavy acceleration out again, to another fast right hander. The corners at Portland are pretty basic with accellerate/brake/carry speed/accelerate onto a longer stretch again. The key for handling tracks is how much of the total lap time is actually spent in a corner. Tracks like Lime Rock, Infineon etc have pretty high ratios of total time spent in a corner and are good for well-handling cars. Places like Portland have higher ratios of acceleration and straights.

    Torque becomes critical in the race where the slower GT cars often have to come off-line or check up to allow faster prototypes by in traffic. Re-accelerating then becomes much more important than it might have been during qualifying or when setting raw times.

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    Jim Derrig 93 750
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    your prediction came true

    caught part of the portland race and watched the F430 motor right by and there was nothing you could do about it--a pure power move assisted by an extra liter of displacement. the abs was of little help as most of the corners do not involve heavy braking and good modulation by a mere human is plenty adequate. sure you can outbrake everyone at level 10, but what about level 5 when the abs isn't triggered? no help--it won't be a fair fight until they lt you have a V8.

    does the abs make trail braking easier? seems like it should.


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    The F430 GTC has a 4.0 liter 430 hp V-8

    PTG's BMW M3s have 3.2 liter I-6s with 300 lb-ft of torque and 430 hp. PTG's M3s are the only cars in the ALMS to have ABS.

    I talked with a guy from Risi Competizione at the Portland Grand Prix and he said the F430 GTC has 430 hp.

    Jaime Melo started from the pole at Portland in his # 62 F430 GTC, but he was hit from behind in the first turn. He had to come in to change the two rear tires and came out around one minute down to the GT2-leading car. GT2 cars took around 1 minute and 13 seconds to get around the track.

    Mika Salo made a pass for the lead in the final 18 minutes.

    http://www.risicompetizione.com/go/news.cfm


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    Most importantly the ABS lets you avoid locking up

    inside front wheels and rears as weight transfers in trail braking. The guys at this level are plenty good to do it anyway in all but the most extreme cases but it certainly takes some of the burden off.


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    Re: ABS helps but Lime Rock is a momentum course

    I think Risi will have the edge at Portland with their F430 GTC.

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