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IMSA Series Planning LMP3, GT3 Tests

Marshall Pruett writes that IMSA is in the planning stages for a pair of intriguing tests that could set its future direction with the TUDOR United SportsCar Championship’s Pro-Am classes.

Team owners in the PC category were invited to attend a closed door meeting with the series last weekend at Mazda Raceway Laguna Seca and were queried about their interest in attending a group test to sample new LMP3 machinery. At present, the current ORECA FLM09 PC cars are set to run through the 2016 TUDOR Championship season, with a replacement, likely to be the P3 formula, targeted for 2017.


According to multiple sources, the test would involve participation from multiple P3 manufacturers as a showcase for potential sales. A date after the 6 Hour race at Watkins Glen in late June was mentioned as a potential timeframe for the test, which would follow the same format used by the ALMS in 2009 when it invited prospective PC owners to test the ORECA FLM09 at Road Atlanta the morning after Petit Le Mans.

“It’s good that in May, more than a year before it happens, we’re meeting to talk about what direction to take,” said one PC team owner who, like the rest, spoke under the condition of anonymity.

IMSA also raised the topic of the introduction strategy for the FLM09’s replacement. In addition to a complete new-chassis update to start the 2017 season, the option of a gradual introduction during 2016 was presented.

“Give the IMSA guys the credit for getting on the PC update done sooner than later,” said another team owner. “They’re willing to sit at a roundtable with team owners, to listen, to give their views on what might work, and then listen to what we need to survive. I think we surprised them with our feedback on what we wanted for our businesses. It wasn’t necessarily what they thought we wanted.

“We don’t all agree, but the consensus was that P3 is the topic to keep talking about, but we didn’t necessarily see IMSA’s need to go there as fast as they suggested. The reaction from the owners’ side wasn’t as warm as I bet they expected. It seems most team owners agree closed-cockpit cars would help to sell more seats, but the cars we own now still work and I wouldn’t mind having them for another five years.”


The European Le Mans Series introduced a P3 class for 2015 which made its debut at Silverstone in April. The closed-top cars, which are powered by spec Nissan V8 engines, were surprisingly reliable on their debut, but it was clear the ELMS technical team would need more races to develop Balance of Performance data. The 2.5-hour race found P3s and GT cars constantly intermingled, and with more time, better separation between the classes should be possible.

“My biggest fear is what happened with the PC car in 2010,” said another owner in reference to the narrow PC-to-GT speed gap. “If it gets in the way of the GT cars like the Pcs did for a long time because they weren’t fast enough, we’re going to drive more customers away. It needs to do 180mph at Daytona and Sebring so we’re not stuck in a GT fight the whole time. If they get that right, I think P3s could be pretty popular. If it’s fast, and it’s a coupe—everybody seems to like the prototype coupes nowadays, I think a P3-style car could be popular.”

Ginetta, Onroak, Riley, and other marques have embraced P3, with the British Ginetta brand getting the jump on the competition by supplying all five cars that raced at Silverstone. Provided the June test happens as it has been discussed, and more than Ginetta is ready to send an example of its Ginetta-Juno chassis, multiple manufacturers would bring cars to the event.

Some owners suggested a performance upgrade and extension for the existing PC car, while others reportedly questioned why a move to a dedicated Pro-Am P2 class wasn’t being considered. The meeting, which most agreed was productive, did not send many owners away with a feeling for where IMSA’s second-tier prototype class is headed.

“They threw a lot of stuff against the wall, but I’m not sure any of it stuck,” one owner surmised.

As Marshall wrote on in March [], IMSA is also continuing to evaluate the expansion of its GT3 offerings, which could include a separate sprint race series.

IMSA will convert the TUDOR Championship’s GT Daytona class to full GT3 spec in 2016, where the cars will contest a regular season of endurance racing, but with the growing popularity of the Pirelli World Challenge series’ GT3-spec GT sprint race format, IMSA has been on the receiving end of inquiries from GT3 owners and entrants.


“That inquiry been part of our discussion for quite some time, it has been a bit of a constant, from our entrants who own GT3 cars that also sometimes race in Pirelli World Challenge,” said IMSA president Scott Atherton in a pre-Sebring interview.

“I would say those inquiries have ramped up as we have clarified that we will, in fact, be FIA GT3 spec in our GTD class next year. It really is going to happen. And in that same conversation when GT3 owners ask what they need to do to do to prepare for next year, they also ask if we are going to put forth a sprint racing option…”

GT3 manufacturers have recently been brought into the conversation on whether they would support a separate IMSA sprint race series for their customer cars, and according to multiple sources within the GTD paddock last weekend, IMSA’s intent to give GT3 owners sprint and endurance options has sharply increased.

Along with the Watkins Glen P3 test, IMSA’s GT3 manufacturers have also been invited to the upstate New York road course to participate in a Continental Tire test. The invitation has been described as one to test cars in full GT3 configuration on the brand’s rubber to capture its performance in sprint and endurance runs to help Continental define its construction and compound variables for 2016.


“I’ve heard of the test at Watkins Glen…” said one rather coy GT3 manufacturer representative.

Rumors regarding the make-up of an IMSA-sanctioned GT3 sprint series make the rounds at Monterey. Suggestions included a capped field and a limited number of events, with between 20-24 cars and no more than six races being considered.

“I’ve asked the series a lot of questions on this, and a lot of us want to know how it would work, if our owners would be allowed to run in both races with our [GT3] car in the same event, and how it would work in all the other ways,” said another manufacturer rep. “They are looking at it very seriously, and I know they are extremely motivated to make it happen.”

As Atherton noted in March, creating a new series would pose a few problems due to the packed event schedules that currently accommodate quite a few existing series. Whether an IMSA GT3 sprint series would come at the expense of one of its feeder series is unknown, but it’s likely some adjustments would be required to fit the class into its season-long plans.

“There’s nothing to announce right now, but it’s something that’s been on our radar and continues to be,” Atherton continued. “We need to be careful internally because, if you look at the overall IMSA umbrella and the content platforms, there has been some schedule compression that’s occurred.

“You’ve got fewer opportunities to pack other racing into major events; everybody wants to be a part of the big weekend, so scheduling would be a primary area of research. I can say that if we were going to pursue something like a [GT3] sprint series, we would only do it if we could offer up the same type of high-quality, high-value, highly professional IMSA production.”

Marshall Pruett