LMDh (DPi regulations version 2.0)

[NaBUru38]

IMSA is planning to adopt new DPi regulations in 2022. What we know:

o- 9 manufacturers are interested.
o- Hybrid electric powertrains are confirmed.
o- Front axis electric motors are discarded.
o- Power levels are discussed. Some want high, some want low.
o- Cost control and affordability by privateer teams are concerns.
o- Bodywork will have more freedom.
o- Compatibility with FIA WEC Hypercars is a possibility.
o- Next meeting is at Watkins Glen.

[MaskedRacer]

They might become the fastest cars in sportscar racing with LMP1 going away. Hypercars won't be as fast if the Le Mans 3 min 30 projection is true.

[NaBUru38]

I don't think that the DPi 2.0 can do 3'30.

[broadrun96]

They are already faster than LMP2s and they are running 3:25s so how would they not run a 3:30??

[canaglia]

likely a michelin 2019 dpi can run somewhere between 3.22 and 3.23 at best.


3.30 for hypercar is the target time for race trim, it may mean about 3.25 for pole.


Anyway, guess dpi 2.0 could realistically become the fastest sportscars of their age. It's just about how much combined power will get with electric motor boost.

[Akrapovic]

IMSA LMP2s are 10kg heavier and have a smaller fuel allocation then ACO LMP2. DPi will be easily as fast as ACO LMP2.

[Tique]

It will be nice if the DPi 2.0 can operate in the same performance window than the hypercar and Run the same race. We could have then a very good mix of car on the grid (Cadillac, Mazda, Accra, Toyota, Aston Martin, Rébellion, SMP, ... )


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[broadrun96]

On the same track, at the same time of year the WEC LMP2s were running tick faster than the current DPis, 1:44.28 average vs 1:45.86 Acura DPi. Tell me the cars will be going slower with an update and they are already close in pace. The idea that the next gen DPi will be slower and not able to theoretically do a 3:30 is either intentionally obstinate, delusional or LMP2s must be better. The LMP2s aren't getting any faster any time soon and the DPis will only get faster

[canaglia]

Originally Posted by Akrapovic

IMSA LMP2s are 10kg heavier and have a smaller fuel allocation then ACO LMP2. DPi will be easily as fast as ACO LMP2.

ACO LMP2: spec dunlop, 930kg, 9000-9200rpm gibson 600hp and about 560Nm as torque peak, sprint and le mans homologated bodywork and gear ratios.


IMSA DPi: spec michelin, 910-960kg according to bop, 2019 DPi have a bit more power, so about 620hp and different torque levels (guess mazda is in the range of 520Nm for most of the range; acura, cadillac and nissan should be >600Nm for most of rpm range). Aero settings according to bop, but basically it doesn't exist a full low drag aero bodywork.


If we take 3.25 as ACO lmp2 benchmark,

guess DPi has more mid-range power and cadillac, acura and nissan have much more torque in low-mid range. Guess DPi michelin too are better than dunlop even if michelin lacks of a soft compound if memory helps me.



In a LM virtual lap, I expect a 930kg DPi a couple of km/h slower than oreca and dallara on straight (ligier lmp2 always had worse top speeds, except riley lmp2... but you know....) but considerably faster exiting long straight chicanes, mulsanne corner, arnage and ford chicanes.

DPi should be slightly faster on porsche sector because of their less low drag design that should produce more downforce than lmp2 in LM bodywork.


No doubts for me the fastest DPi could run 2 seconds faster than ACO lmp2.

[TF110]

I think the new dpi will depend on what lmp2 turns into. And it'll depend on how many sign up for hypercar and it's popularity. If big names like Ford want to do both but with the same car, you might see the rules sway towards what the ACO are offering. But who can tell right now.

[carbsmith]

Originally Posted by MaskedRacer

They might become the fastest cars in sportscar racing with LMP1 going away. Hypercars won't be as fast if the Le Mans 3 min 30 projection is true.

That depends on being faster than GT500.

I would fully expect 2022 DPi to be BoP'd at LMP1 pace at best though, there's absolutely no benefit to going faster. If that is even possible using next gen LMP2 cars as the base vehicle.

[joeb]

Originally Posted by carbsmith

That depends on being faster than GT500.

I would fully expect 2022 DPi to be BoP'd at LMP1 pace at best though, there's absolutely no benefit to going faster. If that is even possible using next gen LMP2 cars as the base vehicle.

As far as we know, is the plan for DPi 2.0 to utilize the upcoming P2 chassis as a base? Do we know anything about the upcoming P2 chassis? I assume they will follow a similar format with a small number of regulated manufacturers but I can't imagine the actual rules regarding the tub will change all that much.

I guess what I'm getting at is, I expect the next gen dpi cars to be about the same (in looks) as the current cars but will also include some type of hybrid system. Don't know what will be done with minimum weight but I would have to imagine the cars will be faster on the current IMSA tracks than they are right now

[Maelochs]

Originally Posted by joeb

As far as we know, is the plan for DPi 2.0 to utilize the upcoming P2 chassis as a base? Do we know anything about the upcoming P2 chassis? I assume they will follow a similar format with a small number of regulated manufacturers but I can't imagine the actual rules regarding the tub will change all that much.

I guess what I'm getting at is, I expect the next gen dpi cars to be about the same (in looks) as the current cars but will also include some type of hybrid system. Don't know what will be done with minimum weight but I would have to imagine the cars will be faster on the current IMSA tracks than they are right now

I figure the P2 chassis will stay for cost effectiveness and performance---it offers both, why mess with it?

[chernaudi]

IMSA are wondering if they should run a 48 volt hybrid, or allow options of 100-400 volts. Ford and BMW are said to be in favor of allowing hybrid systems of up to 400 volts:

https://sportscar365.com/imsa/iwsc/i...e-for-dpi-2-0/

[Phantom Lord]

Originally Posted by Maelochs

I figure the P2 chassis will stay for cost effectiveness and performance---it offers both, why mess with it?

IMSA were making noises about a spec DTM/Super GT -style safety-cell: https://sportscar365.com/imsa/iwsc/i...-new-dpi-regs/

Is that still on the cards, or has it been ruled out?