New ACR loses motor at COTA Details?

[FLATOUT]

If these cars need dry sump to live on track with the OEM tires and aero and setup per the supplement that is a really bad situation. I'll keep my slower GT3.

FWIW I doubt that, as the cup car did fine with slicks and wet sump.

No one said that, at least I didn't, and the car wasn't stock either. Also just food for thought but we've seen lap times faster than the Gen IV ACRX's in the ACR at VIR already. The envelope keeps getting pushed further and further.

[Steve M]

No one said that, at least I didn't, and the car wasn't stock either. Also just food for thought but we've seen lap times faster than the Gen IV ACRX's in the ACR at VIR already. The envelope keeps getting pushed further and further.

You kinda did.

Throwing a rod has nothing to do with the top end package, the real possibility is oiling and G loads that the ACRs are able to achieve. Might be dry sump time to be honest.

[TrackAire]

If these cars need dry sump to live on track with the OEM tires and aero and setup per the supplement that is a really bad situation. I'll keep my slower GT3.

FWIW I doubt that, as the cup car did fine with slicks and wet sump.

Agree with you about doing a dry sump on the car.....never heard of an oiling issue on the Gen 4's or Gen 5's. Didn't SRT use the same ACR-E to set the 13 track records around the USA with pro caliber drivers and that car survived with no oil related failures? Willing to bet the car at COTA has never set any track records.....am I right?

I'm guessing the stock oiling system is not the issue here.

[nuviper]

Maybe we should wait for the detail of the story. We cannot draw any effective conclusion before we make sure that this "rumor" is true.

[FLATOUT]

You kinda did.

I "kinda" did when talking about a car with 100 extra hp, upgraded dampers, on Michelin slicks losing a motor due to oil starvation with a 7,000 rpm fuel cut.

He was discussing needing a dry sump in OEM form on OE street tires.

That's what I was trying to point out.

[FLATOUT]

Agree with you about doing a dry sump on the car.....never heard of an oiling issue on the Gen 4's or Gen 5's. Didn't SRT use the same ACR-E to set the 13 track records around the USA with pro caliber drivers and that car survived with no oil related failures? Willing to bet the car at COTA has never set any track records.....am I right?

I'm guessing the stock oiling system is not the issue here.

The car that let go was not stock.

[XSnake]

Why take the car to 7k? It's simply not necessary with these cars. The only way you are going to go faster by taking it up that high is if you are doing it to save a shift.

[FLATOUT]

Why take the car to 7k? It's simply not necessary with these cars. The only way you are going to go faster by taking it up that high is if you are doing it to save a shift.

Roll race events are the only time it's needed with stock Gen V gearing to save one shift.

[mjorgensen]

Car will be here soon and we will do a quick cursory inspection, at that point I will be deferring to the real experts at Arrow to determine real cause. I would hope that there was not a 7000 rpm corner with high G's as this happened. The wet sump was fine on the ACRX's, but yes the limits of the G5ACR are higher and perhaps even just a pint low on oil could push it past staying supplied with oil.

We are working on a possible buffer for the serious track guys to insure that oil is always present that won't depend on a dry sump and all the money that conversion takes to do. Right now though it's all speculation so let's wait and see.

[RedTanRT/10]

Mark,

If that ACR was one of your's, I'm guessing that it's Dirk's from Washington/Oregon area?? Guessing as I saw it at Buttonwillow in January and he told me you built it, and he's been running all the Speed Venture events this year.

[RedTanRT/10]

I took a look at the Speed Ventures site. If the viper that's near top listed as 750 hp and owned by Dirk then,

STOP THE URBAN LEGEND THAT IT WAS A 100 MI. VIPER.

I met him at Buttonwillow at the end of January when he first got it. He has a ride and drive program out of the northwest. He picked up the car brand new at BW, then drove to Scottsdale and back to attend the Barrett-Jackson auction and break it in, approximately 1,000 miles.

Since that event he's probably run 3-4 more weekends with SV.

As for track prep, he has all the $$$'s, his car comes to the track in a 18 wheeler with 4-5 other arrive and drive track cars, GT-2's and the like. Don't know the shop, but I'm sure they go through the car deeply before any event, and monitor it after each session.

[City]

Maybe we should wait for the detail of the story. We cannot draw any effective conclusion before we make sure that this "rumor" is true.

That was actually brilliantly funny and should be blatantly obvious. I couldn't agree more, however if everyone did abide by your perfectly logical guideline .... well, we'd have an empty forum. LOL

Speculation is what everyone here lives for; providing a great many of us with volumes of useful information. And unfortunately what many scuffle over.

Now back to supposition, assumption, presumption, speculation, postulation and conjecture ... the possibilities are endless.

[AZTVR]

I took a look at the Speed Ventures site. If the viper that's near top listed as 750 hp and owned by Dirk then,

STOP THE URBAN LEGEND THAT IT WAS A 100 MI. VIPER.

I met him at Buttonwillow at the end of January when he first got it. He has a ride and drive program out of the northwest. He picked up the car brand new at BW, then drove to Scottsdale and back to attend the Barrett-Jackson auction and break it in, approximately 1,000 miles.

Since that event he's probably run 3-4 more weekends with SV.

As for track prep, he has all the $$$'s, his car comes to the track in a 18 wheeler with 4-5 other arrive and drive track cars, GT-2's and the like. Don't know the shop, but I'm sure they go through the car deeply before any event, and monitor it after each session.

And, he is not new to tracking Vipers.

[kverges]

meteor strike.

[FLATOUT]

meteor strike.

lmao

[kdaviper]

I "kinda" did when talking about a car with 100 extra hp, upgraded dampers, on Michelin slicks losing a motor due to oil starvation with a 7,000 rpm fuel cut.

He was discussing needing a dry sump in OEM form on OE street tires.

That's what I was trying to point out.

IIRC one reason the Gen V engine doesn't turn 7000 RPM in the first place is because lubrication becomes an issue at those speeds. Weather or not the car was mid-corner could be irrelevant if this is the case

[kverges]

I am waiting to see what those in the know have to say.

[7TH_SIGN]

Could be so many things to include a miss shift by the driver. Will be interesting to see the cause.

[ViperSmith]

7k on a road course just sounds like a bad idea all around

[NT-ACR]

7k on a road course just sounds like a bad idea all around

What? Why?

[Vprbite]

What? Why?

I'm sure others know more than I do about the subject but I would say because you are running it all the way on the ragged edge, spinning that huge bastard of a motor at the very limits of its engineering but for no real reason or gain. That is to say, poor return on investment. You are out of the peak power and torque areas of the curve and you will be there for longer periods of time under load. Roll racing where you are saving yourself a shift may be different but on a road course, you are pushing every last tiny inch of that motor, every component, every fluid to its complete max and not getting a whole lot out of it.

At least as I understand it. Those of you who are more educated on the subject may have a better answer and please correct me if I am wrong but that is why I wouldn't do it. Viper motors are not built to turn like F1 motors. Different engineering.