When.....not if. :snapout:

Mark, maybe Laura can hook you up with a Focus RS. :unibrow:


:peepwall:

Mark your imfo and help is always great and well appreciated by many of us on here,I do agree 100% with you that it was a lot better when it was super nice street cars doing the auto crossing and not full track cars.I admit I would love to track race but can't afford to build the kind of cars it takes to be competitive.Getting ready to start on a new build and hoping to do an ls9 or new LT IV,What do you think of the new LT engines? Thanks for any advice.

#limitless

The LS9 is a proven performer with head room to make more power. The LT4 stuff is very nice but not a lot of extra head room left on that blower.

Bang for the buck the stock LT4 is great. If you want to make more power later the LS9 is easier as of Nov 2015.

As the LT engines become more main stream things may change.

Mark

Expanding on what Mark said:

If you are running a stock LT4, it's a great engine (provided adequate cooling). If you are wanting something more powerful, there are better choices (at least today).

The engine Mark is running in JA2.0 is evolution of 7.0SC package that we started in 2009. We are now capable of 1000hp/1000tq with arguably better driveability than we had with earlier lesser powered versions.

LT engines (at least with OEM ECM) are power based control systems. You MUST have an accurate torque map of entire engine operating range to make these systems work seamlessly. Alternatively, you could switch to MoTeC M142 or M182 and get back to power being a result, rather than an input - and that could have potential.....

LT4 SC is to small to support basically anything over stock power levels. Again, great if you are happy with 650hp..... But I like more!

I could be proved wrong, but I think we are years away from having an LT package at 900+hp/tq range with the driveability and other attributes that Greg Weld was talking about a few posts ago. If he thinks Hellfire drives great, JA2.0 is even better.

Dave

BTW Sieg: I did happen to catch your 'fix' comment - and found it quite funny.

Mark, love these builds and respect the parameters for not going completely track, however is there any gains to be made if an aluminum (dse) subframe, full carbon or aluminum tub were to be incorporated?

As it is it would seem the next direction to go with all else sorted harmoniously (cooling, ABS fuel management etc). Weld can order and Charlie can finance lol:buttkick:

Sure make it lighter and it will go faster.

It is the physics of things

Mass
Power
Center of gravity
Front to Rear weight distrubution
Areo
Downforce
Trackwidth
Grip
2wd or 4wd

Turn this knobs either up or down and the car will go faster within a certain range.

It all depends on what you want to do. How much do you want to spend to go how fast.

Mark

Welcome home, Mark, and congratulations again to everyone involved in JA 2.0 on another successful year in my eyes.


Thanks,
John

If you take a look at the speed stop results from the 2015 challenge:

https://clubregistration.net/clients...ubEventType=SS

and then the AX results:

https://clubregistration.net/clients...ubEventType=AX

You will see the dominance of 4WD in the low speed events. Danny Popp was competitive in his C5 'Vette, but he was driving at 10.5 tenths to do it :)

Watching the speed stop in person, it was visually obvious how much harder the 4wd cars launch. Any car that has enough power/weight ratio to win will probably have traction issues in the lower gears with 2WD and street tires, especially front engine cars.

OK, I understand by looking at the results, but if that's the case, why does porsche make so many different 911 models for example? How does one decide?...lol

Optima
 

One thing I have noticed when tracking is how much faster the
new gt3's are compared to an older one... they seem to accelerate
a lot faster now.. never had them pull away from me in the Pantera
like they do now.
My neighbor said the new transmissions are so much better and
I read where they moved the torque curve down a couple hundred
Rpms and they are .3 faster on a track... They just keep tweaking
things that we cannot on our cars

Still fun to run around in a 43 year old car with those boys

Bob

That perfectly captures what my friend and i talked about all day saturday. This was the 4th time we've been to ousci, and we've seen the move to 'race cars'. You've mentioned you cannot build an old muscle car to beat new cars. Watching that porsche tear up the speed stop in such a seemingly effortless manner drove that home in spades.

Hey Mark, I tried sending you a PM a while back but your inbox was full. Do you have a part number for the Air filter you like to use on your current setup? I saw a recent photo when you were finishing things up on this for the good guys show. It looks like a huge filter, is it sourced from a GM vehicle? I had a discussion with Brian Thomson about this but he wasn't sure about where you're getting the filter from. Thank you for any information you might be able to provide. The Airraid filter I bought was starving my engine on the chassis dyno.

Thanks

It is a 6 inch inlet K&N. I made an adaptor to neck it down to 5 inches. Matt at Sled Alley made the inlet tube that tapers fron 5 inches down to 4 inches at the 90 mm TB.

I hope that helps. I can try to finf the part number but it was the biggest one I could fit in the fender.

BTW my engine is flowing around 1600 CFM so a big filter is part of the package.

Mark

Thanks Mark, that is great info. Your engine is certainly an anomaly!

:thumbsup: :sieg:

Some JA video from an earlier test session:

Jackass looking good on the track last weekend. :thumbsup:

https://photos.smugmug.com/photos/i-...jWb35qk-X2.jpg

great shot Scott!!

Thanks Mark!! :thumbsup:

Is it still 19/20's on J/A?

Thanks,

Lead.

No it is 18 x 10 front and 18 x 12 rear to fit the new Rival S tires.

dig those headlights on a 69. I have them on my 2015 jeep and cant wait to put them on my camaro.

Great shot

It looks like JA 2.0 had a great performance, congrats Mark.

Cooling Question
 

Hi Mark I posted a question on cooling in the cooling section. If you get a few minutes could you check it out and give me your opinion? Its under this heading.

cooling question + Trans cooler location

Thanks.

Wayne

It is Feb. in Michigan and that means another Autoramma.... Matt at Sled Alley did some tune up on Jack Ass and has it ready for the show.

We updated the car with a Marquez fiberglass Endura front bumper to replace the orginal Endura front bumper. We saved about 10 pounds of the nose of the car and after some tune up it fits good.

http://i439.photobucket.com/albums/q...pssuiavmq7.jpg

http://i439.photobucket.com/albums/q...psz4xllr4x.jpg

Matt loaded Jack Ass and the Caddy into Autoramma last night so if your are at the show stop by and say hello. The Caddy is a very cool car.

Jack Ass was in the show in 2008 and this is it's return as Jack Ass 2.0..

http://i439.photobucket.com/albums/q...psgl2v9f2n.jpg

Mark

SIMPLY STUNNING MARK!:star: :star: :star: :star: :star:

Nice, Mark! Is there much left to do with JA 2.0 or is it just dialing it in and enjoying it for now?

Damn... it's been 8 years?

Car looks great.

It still looks like the bell of the ball to me.

Look'n good Mark. :thumbsup:

Hi Mark
I was just watching the motor trend video of the corvette zo6 against the viper acr at Laguna Seca.
I would love to see jackass or hellfire be driven by Randy Pobst there just to see how one of your superior pro touring cars stacks up with the best latest Detroit cars.
That would be really cool to see what old school body with modern tech can do.

Does it bolt up in stock location??

Anybody know what and how far along , the next build is?

Yes it does.

Don

What does the radiator setup cost?

I can't remember so it would be best for you to give them a call.

Don

Ok thanks

Called around $2000.00