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4 Dec 2017, 18:04 (Ref:3785090) | #3201 | ||
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I wouldn't leave out the P2s of the equation. Last year all the P2 had electronic problems (only the Riley ran well and finished 3rd!), but by mid of the season they were at front fighting.
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4 Dec 2017, 18:41 (Ref:3785098) | #3202 | ||
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Outside of that, the Caddies will definitely be up there along with Nissan and very interested to see the Acura out of the box. This weeks BOP testing will tell us more. Hopefully with better cars elsewhere this year the caddies wont be hamstrung and some great racing can be had all season long! |
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4 Dec 2017, 19:14 (Ref:3785106) | #3203 | ||
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It looks like Montoya is very happy with the Acura.
http://www.racer.com/imsa/item/14610...acura-dpi-ride |
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4 Dec 2017, 20:39 (Ref:3785119) | #3204 | |||
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4 Dec 2017, 21:33 (Ref:3785133) | #3205 | |||
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4 Dec 2017, 21:41 (Ref:3785134) | #3206 | ||
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The Nissans has been very strong at the end of the season, if they improved the cooling of the engine, maybe they could go even faster in 2018.
If the Cadillacs with the new Dallara splitter can get better front grip, they would be the best cars on track again. I say this because I think WTR solved the lack of front grip with a good setup, but Action Express fought all year to be as fast as WTR car. Maybe the Taylor brothers got a setup to suit their driving style that wasn't good for the other drivers. |
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6 Dec 2017, 22:16 (Ref:3785533) | #3207 | ||
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Random and probably stupid question, but anyone have a guess at what a DPI budget is? Watching an old ALMS race on You Tube it was claimed that in '03 that Champion Racing spent $4.5 million USD to run a full ALMS season.
I know it's kind of apples to oranges (15 year time gap/inflation, IMSA didn't have a true 24 Hour race on the schedule unless you counted Le Mans, etc), but I was wondering just for comparison's sake. |
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6 Dec 2017, 22:51 (Ref:3785541) | #3208 | |||
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8 Dec 2017, 21:26 (Ref:3785930) | #3209 | |||
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Marshall Pruett reports that:
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“Sometimes there’s no poison like a dream.” — Tanya Donelly |
2 Jan 2018, 10:29 (Ref:3790286) | #3210 | ||
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Interesting Cadillac will reduce the engine capacity from 6.2L down to 5.5L in an attempt to help IMSA BOP targets.......seems like IMSA and Cadillac had a quiet kitchen discussion and agreed the 6.2L was a bit of a joke and causing everyone an un-needed BOP headache.
http://sportscar365.com/imsa/iwsc/ca...ed-dpi-engine/ Seems like a case of collective stupidity to me, mostly on IMSA's side, whereby they should not have allowed such a huge engine capacity to compete in the first place. |
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KnighTorque |
2 Jan 2018, 12:27 (Ref:3790294) | #3211 | |||
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2 Jan 2018, 12:31 (Ref:3790296) | #3212 | ||
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Is this just the 5.5 litre out of the GTE/GTLM Corvette?
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2 Jan 2018, 13:59 (Ref:3790305) | #3213 | ||
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LS and LT are basically the same engine design overall, so I doubt there's much of a weight difference. I'm betting it's down to BOP.
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2 Jan 2018, 14:10 (Ref:3790307) | #3214 | ||
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Guess won't never be confirmed if new cadillac engine is a destroked 6.2L or an updated corvette DP LS9, but I don't expect a considerable weight loss by this swap. Acura, nissan and cadillac should be in the same torque range now; with acura as the only brand fielded by the closest thing to an official work team (actually don't know if WTR will keep on being supported by GM and dallara like 2017 season.... AXR and SoD won't be for sure). Is unlikely a cadillac domination like 3/4 of last season. |
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2 Jan 2018, 23:18 (Ref:3790381) | #3215 | |
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Just for fun I made some odds for how I see the Prototype class at Daytona
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3 Jan 2018, 03:21 (Ref:3790396) | #3216 | ||
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3 Jan 2018, 09:06 (Ref:3790430) | #3217 | |
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When you have so much torque by your side, being a little overweight is not a problem at all. Peugeot 908HDi has always been overweighted and very likely even porsche, audi and toyota lmp1 are over the min. weight.
During 2014-2016 IMSA seasons, DP were 140kg heavier than lmp2, but basically was irrelevant. About cadillac there is an Angelelli interview after daytona success where he states that car is a bit more powerfull than lmp2 but however heavier because of the larger engine. About esm, before laguna seca race, scott sharp stated that the track fits better for aco lmp2 becasuse are about 50kg lighter than them. And funny side of the issue, just one years ago, you were the one who speculated about esm car overweight (page 135 of this thread) |
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4 Jan 2018, 08:25 (Ref:3790573) | #3218 | ||
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DP vs lmp2 is a different scenario because the former had at least 100 more horsepower. These DPi's are the same lmp2's but with new hardware, they don't have that big of a power advantage. If you have a source that would be nice to read! |
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4 Jan 2018, 09:37 (Ref:3790580) | #3219 | |
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let's clear something: oreca 07, along liger and dallara lmp2 with gibson engine under the hood are lighter than 930kg. No doubts about that. Add to this mandatory air conditioning system and you just have some room left for ballast to reach 930kg.
Turbo engines are heavier, require extra cooling devices around it and a more resistant rear subframe structure joint to the monocoque; very likely acura dpi uses a different rear suspensions geometry than standard 07, to make the powertrain fully stressed. The latter is just a my theory of course, but quite realistic I guess. All these modifies make the car much heavier. Question: Is oreca 07 chassis so light that even if powered by HPD 3.5 V6, the car will remain under 930kg? Perhaps, or maybe not. About lmp2/DPi, is not so correct. Power gap between lmp2 and dp was in the range of 60hp in 2014 (nissan 500hp lmp2 vs GM/ford about 560hp). From that, dp power was constantly nerfed, until 2016 season where ligiers powered by HPD 3.5L were basically in the same power range power, if not something more. Real deal for dp was that both riley ford and corvette DP were in 600-640Nm range, 100Nm more than lmp2 nissan, that helped the dp's to be on the edge even if heavier and less aero/chassis developed. |
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4 Jan 2018, 12:36 (Ref:3790607) | #3220 | ||
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4 Jan 2018, 14:56 (Ref:3790636) | #3221 | ||
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HPD engine can't be stress mounted in the Oreca-Acura because it's a stock block engine. Neither can the GM V8 in the Cadillac or the Nissan in ESM's Ligiers be fully stress mounted. By which I mean bolted directly to the monocoque vs being mounted in a sub-frame.
If you're going to redesign a stock block engine to be fully stress mounted, may as well start from a clean sheet of paper. The only thing stock on these engines are the basic block and heads, but the basic block and heads aren't designed to be bolted to the tub as an integral member. |
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4 Jan 2018, 16:18 (Ref:3790654) | #3222 | ||
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Sent from my SM-G930F using Tapatalk |
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4 Jan 2018, 20:43 (Ref:3790708) | #3223 | ||
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MP has some engine related info (semi stressed) in the Caddy
http://www.racer.com/imsa/item/14656...smaller-engine Also, imsa has a 580hp target. |
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4 Jan 2018, 20:49 (Ref:3790710) | #3224 | ||
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Semi-stressed to me implies tube frame that ties the engine to the tub. I doubt that the block and heads on any of the stock block engines has been modified enough to be bolted to the monocoque.
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4 Jan 2018, 21:24 (Ref:3790715) | #3225 | |||
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