IMSA DPi Discussion - Page 70

Matt · 13 Dec 2016, 22:21 (Ref:3695967)

Quote:

Originally Posted by chernaudi

I also like how the Riley had a removable bodywork section so they can work on the front suspension without having to remove the whole nose, kinda like the old Lolas and sort of like the Bentley Speed 8.

Here's a fun one.

The fin on the Riley isn't part of the engine cover. It's almost like it's structural. The engine cover is a two piece cover that clips into the fin.

fieldodreams79 · 13 Dec 2016, 22:31 (Ref:3695972)

Quote:

Originally Posted by Matt

Here's a fun one.

The fin on the Riley isn't part of the engine cover. It's almost like it's structural. The engine cover is a two piece cover that clips into the fin.

Cool! The first picture makes my neck hurt....

CyberMotor · 13 Dec 2016, 22:42 (Ref:3695978)

Quote:

Originally Posted by Matt

Here's a fun one.

The fin on the Riley isn't part of the engine cover. It's almost like it's structural. The engine cover is a two piece cover that clips into the fin.

Yes, that's way cool. I like people thinking differently.That's where the fin belongs to be attached anyway, if you think about it.

Years ago, I was standing next to Bill Riley and we were looking at the Audi endplates that almost touched the rear panel but didn't.

I said, "That's pretty cool the way they did that!"

Riley answered, "I submitted the same idea several years ago and they rejected it. Interesting how some people get approved when others don't."

Yikes! Wasn't expecting that!

Anyway, it's great seeing Riley still coming up with innovative ideas.

I'm really liking the new look and interpretations and variations in engine sounds.

CyberMotor · 13 Dec 2016, 22:46 (Ref:3695981)

Quote:

Originally Posted by fieldodreams79

Cool! The first picture makes my neck hurt....

That guy has some ostrich in him, me thinks. Where is his head?

Matt · 13 Dec 2016, 22:54 (Ref:3695987)

Better hope that engine is reliable, gonna be a bear to work on

TF110 · 13 Dec 2016, 22:54 (Ref:3695988)

Quote:

Originally Posted by fieldodreams79

http://livetiming.alkamelsystems.com/imsa/

Looks like WTR haven't done a lap yet. Action Express are on the slow end at 1:46+

My 6 year old just told me he likes the WTR livery but not the others.

I mixed up the two Cadillac's. Either way they're going quick!

fieldodreams79 · 13 Dec 2016, 23:06 (Ref:3695992)

Quote:

Originally Posted by TF110

I mixed up the two Cadillac's. Either way they're going quick!

Nope. You had it right. WTR had some telemetry issues and didn't show on t&s but were well up the order

Quote:

Originally Posted by Matt

Better hope that engine is reliable, gonna be a bear to work on

Mazda? Reliable? No better place to find out than a 24 hr race!

Quote:

Originally Posted by CyberMotor

That guy has some ostrich in him, me thinks. Where is his head?

it's in a place mine won't be able to go.

Lagunaseca_4life · 14 Dec 2016, 00:49 (Ref:3696001)

Quote:

Originally Posted by Matt

Better hope that engine is reliable, gonna be a bear to work on

looks easier to work on compared to the ford gt.

**joeb** · 14 Dec 2016, 02:01 (Ref:3696008)

Quote:

Originally Posted by fieldodreams79

Nope. You had it right. WTR had some telemetry issues and didn't show on t&s but were well up the order

Mazda? Reliable? No better place to find out than a 24 hr race!

it's in a place mine won't be able to go.

Watch your tongue sir when you mention the Mazda! And that pic was from the Gibson engined Riley.

On another note, I now like the #5 livery after seeing it on track.

hondafan37 · 14 Dec 2016, 02:31 (Ref:3696013)

The first laps times analysis is:
Cadillac DPI 1:38:766
Ligier JSP217 mid-to-high 1:39 lap in November test
Riley LMP2 1:40:714
Mazda DPI 1:41:117
http://results.imsa.com/Results/16_2...by%20Class.PDF

The 2016 P2 Cars, with 100 HP less and the old harder Continental tires was:
Ligier JSP2 Honda 1:38:889
Lola Mazda 1:40:376
http://www.racingsportscars.com/resu...016-01-31.html

I guess the 2016 cars should be more than 1 second faster with the new Continental tires.
I think it is a good start for the new DPI but there is a lot of development ahead.

Matt · 14 Dec 2016, 02:34 (Ref:3696014)

or theyre not really pushing too hard yet

fieldodreams79 · 14 Dec 2016, 02:37 (Ref:3696015)

Quote:

Originally Posted by joeb

Watch your tongue sir when you mention the Mazda! And that pic was from the Gibson engined Riley.

On another note, I now like the #5 livery after seeing it on track.

I got a little excited today with "cars on course" and black liveries and work and prototypes; I saw a black car and made a mistake. My apologies but the comment still stands on Mazdas. The last one we saw....well let's no bring up old stuff. That really goes for all of them. It will be interesting to see who is reliable.

And I'll agree with you on the 5. Cars always look better on course at speed, no matter what.

Fogelhund · 14 Dec 2016, 02:37 (Ref:3696016)

Quote:

Originally Posted by Matt

or theyre not really pushing too hard yet

Get as many miles as you can under your belt, don't show the full performance, in gamesmanship for BoP.

hondafan37 · 14 Dec 2016, 02:48 (Ref:3696019)

Quote:

Originally Posted by Fogelhund

Get as many miles as you can under your belt, don't show the full performance, in gamesmanship for BoP.

you are right, "don't show the full performance, in gamesmanship for BoP"
This is the truth and I escaped my consideration.

FormulaFox · 14 Dec 2016, 02:58 (Ref:3696021)

Quote:

Originally Posted by hondafan37

you are right, "don't show the full performance, in gamesmanship for BoP"
This is the truth and I escaped my consideration.

What makes this test so exciting, IMO, is that there's actually even more to it than that - even without BoP it'd be kind of foolish to show your hand right now because, well... Nobody actually knows exactly WHAT is in their hand yet.

EVERYBODY in the Prototype class is trying out brand new equipment here. Now is the time to feel it out, find out it's quirks, figure out ways to address potential failures, etc - not the time to push the performance envelope and risk accidentally cutting short the test before you learn all the little things.

carbsmith · 14 Dec 2016, 03:10 (Ref:3696022)

I would think the Mazda has the same style of airbox and engine cover anyways?

silente · 14 Dec 2016, 07:39 (Ref:3696035)

Quote:

Originally Posted by hondafan37

The first laps times analysis is:
Cadillac DPI 1:38:766
Ligier JSP217 mid-to-high 1:39 lap in November test
Riley LMP2 1:40:714
Mazda DPI 1:41:117
http://results.imsa.com/Results/16_2...by%20Class.PDF

The 2016 P2 Cars, with 100 HP less and the old harder Continental tires was:
Ligier JSP2 Honda 1:38:889
Lola Mazda 1:40:376
http://www.racingsportscars.com/resu...016-01-31.html

I guess the 2016 cars should be more than 1 second faster with the new Continental tires.
I think it is a good start for the new DPI but there is a lot of development ahead.

are you sure that the old LMP2 had 100 hp less than now in 2016?

New engines have around 600hp, 2016 WEC lmp2 engines had about 490-500, but as far as i know the imsa spec engines had something in the region of 550...So maybe we should not expect as much of a difference in lap time in Daytona as we would expect in Europe?

TF110 · 14 Dec 2016, 07:49 (Ref:3696037)

They're already as fast as the best from this year's race on the first day. Improvements will surely be made. I think they might be able to get into the 37's, maybe we'll see tomorrow.

**joeb** · 14 Dec 2016, 12:09 (Ref:3696106)

Quote:

Originally Posted by silente

are you sure that the old LMP2 had 100 hp less than now in 2016?

New engines have around 600hp, 2016 WEC lmp2 engines had about 490-500, but as far as i know the imsa spec engines had something in the region of 550...So maybe we should not expect as much of a difference in lap time in Daytona as we would expect in Europe?

I think you are probably correct on the hp numbers. The Honda and Mazda units last year had to have made more that 500 hp to keep up with the corvette DPs. The new engines might be more powerful yet, but there are additional improvements from the chassis and tires this year.

Damian Baldi · 14 Dec 2016, 15:00 (Ref:3696145)

R. Taylor Cadillac is getting 198mph - 316 km/h as top speed today

TF110 · 14 Dec 2016, 20:01 (Ref:3696210)

1:37.7 from the #31!

Damian Baldi · 14 Dec 2016, 20:07 (Ref:3696212)

Quote:

Originally Posted by TF110

1:37.7 from the #31!

Yeah ! and the Mazda finally under 1.40 with just 186 mph final speed. They are loosing an entire second just on the last sector with that poor final speed.

Matt · 14 Dec 2016, 20:39 (Ref:3696217)

fieldodreams79 · 14 Dec 2016, 20:42 (Ref:3696220)

Quote:

Originally Posted by Matt

That's cool to see them side by side like that. Or on top of each other.

canaglia · 14 Dec 2016, 20:54 (Ref:3696225)

about max power:

up to 2013: max hp was in the range of 500-520hp for DP

2014: about 560hp for ford and GM DP motors, about 500hp for nissan/HPD/judd lmp2 cars, about 520-530 for the oak HPD ligier

2015: about 540-550hp for ford and GM DP motors, about 500hp for nissan/HPD/judd lmp2 cars, about 520-530 for the MSR HPD ligier

2016: about 540-550hp for ford and GM DP motors, 500hp for nissan (less than 500hp at sebring), 540-550hp for the 3.5 MSR and ESM HPD ligier

top speed range didn't change a lot during years. More power was balanced by more downforce/drag

This year, in theory new narrower lmp2 cars should produce less drag than old chassis. Because of that, without traffic, should be easy to hit 310km/h lap by lap. Pheraps mazda has a worse top speed because the engine developes less than 600hp, surely because of reliability issues (not surprised about that)

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