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Old 31 Jul 2019, 18:51 (Ref:3920578)   #1
joeb
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Road America 2019

It is race week at my favorite track in North America. Mazda is coming off back to back victories but has been slightly pegged back by the latest BOP. The Juncos Caddy is going to miss this round after the big crash a few weeks ago, but we have Starworks returning with their Audi in GTD.

Schedule

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Old 31 Jul 2019, 21:34 (Ref:3920599)   #2
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canaglia should be qualifying in the top 10 on the gridcanaglia should be qualifying in the top 10 on the grid
lol cadillac min. weight pushed to 980kg!!!


can't remeber a cadillac so heavy even when they got the 6.2L
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Old 1 Aug 2019, 02:03 (Ref:3920609)   #3
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lol cadillac min. weight pushed to 980kg!!!


can't remeber a cadillac so heavy even when they got the 6.2L
I saw that too. That is a ton of weight. How fast could they be at 900 kg? Well they did get a power increase to go along with the weight, so maybe they will be more competitive?
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Old 1 Aug 2019, 03:20 (Ref:3920615)   #4
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I saw that too. That is a ton of weight. How fast could they be at 900 kg? Well they did get a power increase to go along with the weight, so maybe they will be more competitive?
Were they catching up on long runs and IMSA is trying to manage tire wear? Same speed likely but not so light on their tires so the times are more consistent throughout the stint?
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Old 1 Aug 2019, 17:52 (Ref:3920697)   #5
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I saw that too. That is a ton of weight. How fast could they be at 900 kg? Well they did get a power increase to go along with the weight, so maybe they will be more competitive?

it's an insane weight ballast!
2 years ago, none else could get the same torque release because of huge 6.2L and it was fair to be the heaviest car in grid (according to some rumors cadillac dpi real weight was even over bop 950kg) but now GM 5.5L torque curve shouldn't be that different to the acura one!

About 40kg is really too much.

Restrictors don't tune up or down low-mid torque.
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Old 1 Aug 2019, 20:13 (Ref:3920724)   #6
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Base weight is 930kg not 900kg. Their weight difference to the Mazda has stayed the same, the problem is everyone has to get fatter because they can't get that pig Nissan below 935kg or run more boost on a GT3 engine without blowing motors. I believe some of us pointed out this problem when they insisted on making LMP2 a separate class and anyone thought DPi was actually going to get faster.
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Old 2 Aug 2019, 01:23 (Ref:3920749)   #7
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Base weight is 930kg not 900kg. Their weight difference to the Mazda has stayed the same, the problem is everyone has to get fatter because they can't get that pig Nissan below 935kg or run more boost on a GT3 engine without blowing motors. I believe some of us pointed out this problem when they insisted on making LMP2 a separate class and anyone thought DPi was actually going to get faster.
I don't understand why they have to run the GTR engine in the 'nissan'. Why not just use the engine ByKolles was running? Is that somehow against the rules? Is the Chevy engine not a race engine? It must be production based according to their rules or something.
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Old 2 Aug 2019, 02:06 (Ref:3920752)   #8
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I don't understand why they have to run the GTR engine in the 'nissan'. Why not just use the engine ByKolles was running? Is that somehow against the rules? Is the Chevy engine not a race engine? It must be production based according to their rules or something.
I think the Nissan GT3 engine was selected because it was cheap and available. There isn't a production based rule in the DPi regs afaik. A switch to the Cosworth Nissan LMP1 engine would incur a significant cost that Nissan isn't fronting, so that would be up to the single car team running it. Same with Mazda, people were calling for them to use the AER LMP1 engine, but now this old 2 liter unit is making power reliably and winning races. The Nissan has won endurance races with the current engine, not sure why they would switch it.
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Old 2 Aug 2019, 08:14 (Ref:3920785)   #9
canaglia
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canaglia should be qualifying in the top 10 on the gridcanaglia should be qualifying in the top 10 on the grid
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Base weight is 930kg not 900kg. Their weight difference to the Mazda has stayed the same, the problem is everyone has to get fatter because they can't get that pig Nissan below 935kg or run more boost on a GT3 engine without blowing motors. I believe some of us pointed out this problem when they insisted on making LMP2 a separate class and anyone thought DPi was actually going to get faster.

Actually 930kg is base weight for ACO lmp2, mazda dpi used to run with a min. weight of 915kg. There isn't a min weight for dpi, as it seems for cadillac there isn't a possible max weight as well....


Actually don't think nissan dpi influences that much bop...

also because since they'll surely sticking to more reliable and heavier 2017 engines, likely car is about 950kg heavy.
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Old 2 Aug 2019, 08:16 (Ref:3920786)   #10
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I think the Nissan GT3 engine was selected because it was cheap and available. There isn't a production based rule in the DPi regs afaik. A switch to the Cosworth Nissan LMP1 engine would incur a significant cost that Nissan isn't fronting, so that would be up to the single car team running it. Same with Mazda, people were calling for them to use the AER LMP1 engine, but now this old 2 liter unit is making power reliably and winning races. The Nissan has won endurance races with the current engine, not sure why they would switch it.

Nissan involvment in dpi is really poor: gt3 engine + nismo stickers.
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Old 2 Aug 2019, 11:37 (Ref:3920816)   #11
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Nissan involvment in dpi is really poor: gt3 engine + nismo stickers.
Hence why he was saying why switch engines? The GTR GT3 lump was relatively easy to procure and fairly inexpensive for ESM, now Core, to source. Spares became a problem at the end and I believe ESM had to withdraw 1 car from a couple races as they only had the 2 engines on hand.

The BOP is most likely driven by the Nissan as the point is to keep all the cars together. It can't really be sped up more and Braun is not slouch in a prototype so they have to restrict the remaining cars a bit. Everything else probably has plenty of pace in hand but in order to keep a long term partner around IMSA is slowing everyone to the Nissan's pace. I understand their thinking and Core is a big part of IMSA and has had a car of some kind in the field for a while.
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Old 2 Aug 2019, 12:04 (Ref:3920820)   #12
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canaglia should be qualifying in the top 10 on the gridcanaglia should be qualifying in the top 10 on the grid
don't know... to me seems like IMSA increased acura and cadillac min.weight as mazda received a weight ballast too.... basically to penalize everyone.
About gt-r gt3 engine, last year at WG, nismo introduced 2018 specs engines, made with lighter parts but extremely unreliable... infact both ESM had several engines failures during WG week-end and could field just one car at mosport waiting for fresh 2017 engines.



Being DPi basically a bop class, bespoke engines are allowed, but guess coswroth-nismo V6 3L is too expensive... and basically worthless since dpi can't have more than 600-620hp.
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Old 2 Aug 2019, 20:07 (Ref:3920868)   #13
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cbbrit should be qualifying in the top 10 on the gridcbbrit should be qualifying in the top 10 on the grid
The Starworks Motorsport Audi R8 LMS was almost last in the first practice session! Th team completely disassembled and rebuilt the car between VIR and RA, but so far is still lacking speed:

https://racerdigital.files.wordpress...practice-1.pdf
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Old 2 Aug 2019, 22:26 (Ref:3920883)   #14
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Acura dominated practice 1 (with Nissan up there too), but for second practice things seem a bit more close. Lots of teams have tested here previously, so they should have an idea on the setup. Still expect to see a time in the 1:49's for qualifying.

Practice 1

Practice 2

Last edited by joeb; 2 Aug 2019 at 22:41.
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Old 2 Aug 2019, 22:44 (Ref:3920886)   #15
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Originally Posted by cbbrit View Post
The Starworks Motorsport Audi R8 LMS was almost last in the first practice session! Th team completely disassembled and rebuilt the car between VIR and RA, but so far is still lacking speed:

https://racerdigital.files.wordpress...practice-1.pdf
Lowest top speed for the starworks car also.

top speeds
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