Road course differential advice

[Steve1968LS2]

Never mind.. I found the case.. nice!

How about it compared to iron for durability? Not like Penny is a daily driver but still.. thoughts?

http://www.curriejeep.com/CEStore/Product.aspx?id=2096

Here's the pinion support you mentioned:
http://www.curriejeep.com/CEStore/product.aspx?id=1657

And here's the diff.. man, that's spendy...

How much better is it than the True Trac and is it as good on the street?



http://www.curriejeep.com/cestore/pr...E.aspx?id=1647

[chicane67]

Dont forget... not the polished one... the "as cast" unit. I just wish it had a 'load bolt' provision.

Durability ?? Not a question. The Strange case is more than adequate for the application. Plus your not trying to launch it on slicks at LACR for a living. I wouldnt even think twice. What you gain in weight savings helps the suspension ten fold. Not to mention... that if it were put together correctly the first time... there should'nt be an issue for its entire life. The only Iron case that I would consider would be the Mark Williams 57460 or my choice the 57465 case.

As for the cost... I did mention an alternate approach. Currie isnt really moola friendly on certain components... and that is one of them. And... if you actually read this thread... my previous comments sum it up. $675 once... is cheaper than $375 twice. Oh yeah. They want $875...

Its the difference between night and day. Not to mention the strength is far and above that of an 'out of the box' True Trac. Unless you want to take it apart as I explained earlier in this thread and spend another $300 to tune it correctly. ? Naw... I didnt think so either.

You better squeeze Ray for the good guy price.

[parsonsj]

I'm using the Moser as-cast aluminum case. So far, so good.

jp

[Steve1968LS2]

Dont forget... not the polished one... the "as cast" unit. I just wish it had a 'load bolt' provision.

Durability ?? Not a question. The Strange case is more than adequate for the application. Plus your not trying to launch it on slicks at LACR for a living. I wouldnt even think twice. What you gain in weight savings helps the suspension ten fold. Not to mention... that if it were put together correctly the first time... there should'nt be an issue for its entire life. The only Iron case that I would consider would be the Mark Williams 57460 or my choice the 57465 case.

As for the cost... I did mention an alternate approach. Currie isnt really moola friendly on certain components... and that is one of them. And... if you actually read this thread... my previous comments sum it up. $675 once... is cheaper than $375 twice. Oh yeah. They want $875...

Its the difference between night and day. Not to mention the strength is far and above that of an 'out of the box' True Trac. Unless you want to take it apart as I explained earlier in this thread and spend another $300 to tune it correctly. ? Naw... I didnt think so either.

You better squeeze Ray for the good guy price.

Polished?? PLEEEEESEE... lol.. the less I have to clean under there the better

Squeeze for a good price??? lol.. you're so cute

[CarlC]

.....any story explaination on bearing pre-load and how to do it and get it right... and on gear pattern and what it takes to do it and get it right. Get plenty of pictures of the gear pattern stuff. Pinion support assembly will be part of the bearing pre-load stuff... but its assembly is pretty important stuff.

Ditto. The greatest components in the world won't work if they are improperly assembled.

[Steve1968LS2]

Ok, here's what we're building:

CE-4028A alloy 3.062" case
CE-4048C alloy big bearing pinion support
Eaton True Trac
Midwest 4.10 gears
CE-4044B billet yoke OR their iron yoke.

As for the yoke they feel it's nearly as strong as the billet unit, and at my power level is more than capable.

I would lighten the gear set but it will take 2-3 weeks to get it done. I don't have that much time due to deadlines. I will discuss it though. The Midwest gears are equal to the USGear.

The Platinum track was way to expensive, I'm not building a racecar.

I want to discuss the benefits of weight and all the different options specific to a "road race" third member compared to a "drag race" unit.

Shooting the build/story next week.

[chicane67]

Next week huh ??

Well... you will need to look at the Jerico web site, specifically their catalog, for some eye opening stuff on the subject of lightening components.

You will also want to look at the Mark Williams site and catalog... as they too have a bunch of low friction options as well as being the best products currently made in the market. Oh yeah... they also have some great lightening tricks up the sleeve too.

And... you may as well throw the hat in the ring and possibly talk about REM finishing and cryo treatments. These topics at least cover all differential builds and are not subject to one specific application.

And by the way Steeve... PlatinumTracks are not just for race cars. I myself... just hate to spend money twice.

Oh. Yeah. Midwest gears are not quite the same... but then again I am not trying to sell you something either.

[Payton King]

Steve what gear were you running? I am thinking of going up on my set as well. I am turning 1500 at 65 mph and would like to raise it a bit.

I have a 9 inch with a set of 3.80 gears and a tru-trac. The gear set came from Hendrick race team here in Charlotte. They have been polished.

My question is the rear howls on the pull side but is whisper quite on the coast or decel. Is this a diff problem or a lash problem?

6th gear, 2000 rpm, 80 mph it almost sets up a harmonic in the car.

[chicane67]

Gear patterns for race cars are a little different than it would be for patterns for street cars.

Race car:


The drive side of the tooth is set up a little toe to combat tooth loading and deflection. Since race cars and noise are an all in one package... the noise from the gear set up is acceptable.



Street car:


Since passenger cars (the idea of them) are more for comfort vice 800hp high bank pavement pounders... the noise is somewhat unacceptable to the masses. Not to mention, that they were not designed and/or produced with the idea of and level of performance that mere mortals ever needed.

[James OLC]

For what it's worth we are running a DPI platinum track in the OLC Camaro. When we were laying out the the rear end design with Mark Williams I asked their chief tech what differential he would recommend in a road racing, ORR, autocross environment and his answer, with no response was the DPI unit. What really impressed me was that he then went on to say that they do not stock nor sell the DPI unit but suggested that I contact them directly and make arrangements to get one straight from DPI. Besides the obvious pleasure dealing with someone who is truly out to ensure that a customer or potential customer gets what is best suited for him regardless of his line card, the guys at MW went out of their way to explain the benefits, pro's and con's.

At the end of the day though, the pretty much told me the exact same things that Tom had told me when we first started talking about differential options....

[Payton King]

so what you are telling me is I am going to have to live with the whine for the durability trade off...not a problem

This is the first 9 inch that I have owned and the guy who set it up does circle track cars, so I am sure it is correct.

Thanks for you time to post.

Payton

[Steve1968LS2]

Next week huh ??

Well... you will need to look at the Jerico web site, specifically their catalog, for some eye opening stuff on the subject of lightening components.

You will also want to look at the Mark Williams site and catalog... as they too have a bunch of low friction options as well as being the best products currently made in the market. Oh yeah... they also have some great lightening tricks up the sleeve too.

And... you may as well throw the hat in the ring and possibly talk about REM finishing and cryo treatments. These topics at least cover all differential builds and are not subject to one specific application.

And by the way Steeve... PlatinumTracks are not just for race cars. I myself... just hate to spend money twice.

Oh. Yeah. Midwest gears are not quite the same... but then again I am not trying to sell you something either.

I know PlatinumTracks arn't JUST for race cars

The story is at Currie, so I need to do it on parts they have. I will discuss the DPI and Detroit units, I'm just using the Detroit unit.

So, what's wrong with the midwest gears compared to the USGear? They use to use the USGear but USGear couldn't keep them supplied.

The lead time killed me on getting a set of gears lightened. They are digging around the shop to see if they have a set already done. At the very least I will discuss the topic.

I'm pretty much going to go over a "cost is no object" diff and then a more wallet-friendly option. My unit is a compromise based on money and, in some regards, to the time frame I have to work in. Hopefully I can make the story educational.

At the end of the day Penny is still a street car that will occasionally see some track time and not the other way around.

[chicane67]

Here is where you got into trouble:

I'm going ot Currie next week to do a story on building a third member for the road track. Suggestions?

And then you stated this:

The Platinum track was way to expensive, I'm not building a race car.

So which is it going to be Steve-O ??

I will try and surmise all of this... with a simple statement:

At this level, street cars are merely race cars with license plates.



We can talk about the gear difference in a private setting sometime...


Next... on your full blown build speal... don't forget to add the EDM lightened gear sets from Tex Racing, a MW titanium yoke and throw in a pinion driven gear pump for the cooling efforts.

[Steve1968LS2]

Here is where you got into trouble:



And then you stated this:



So which is it going to be Steve-O ??

I will try and surmise all of this... with a simple statement:

At this level, street cars are merely race cars with license plates.



We can talk about the gear difference in a private setting sometime...


Next... on your full blown build speal... don't forget to add the EDM lightened gear sets from Tex Racing, a MW titanium yoke and throw in a pinion driven gear pump for the cooling efforts.

Ok, you're right.. I give..

I should have said..

"I'm going to Currie next week to do a story on how to choose parts for more "road race" g-Machine car. And even though some of the parts won't be the "full race" versions I will still address those parts in the story. After all, Penny is far more of a street car."

How was that? lol

Titanium Yoke? Well, this isn't circle track magazine.. I don't know how far I will get into the total race stuff. I'm sure we will talk when I get down to writing the story.

[chicane67]

Yup, Titanium. But, its not for left handers...

[Steve1968LS2]

Yup, Titanium. But, its not for left handers...

What I meant is that some of the more exotic, and expesive, stuff is more towards the race side where people are spending tons to be a hair faster. In other words it's more on the "race car" side of the equation.

How much does a Titanium yoke cost? Just curious...

[Damn True]

Can someone PLEASE edit the title of this thread?

It's driving me up the wall.

[fast Ed]

Scott,

Is that the same diff that is used by Ford in the 03-04 Cobra Mustangs?

Andrew

Andrew, the 03-04 Cobras used a standard Ford traction-lock differential, but with carbon fibre clutch packs.


cheers
Ed N.

[parsonsj]

Can someone PLEASE edit the title of this thread?

It's driving me up the wall.

Glad I'm not the only one!
jp

[chicane67]

What I meant is that some of the more exotic, and expesive, stuff is more towards the race side where people are spending tons to be a hair faster. In other words it's more on the "race car" side of the equation.

How much does a Titanium yoke cost? Just curious...

There are things that I do and its not just to go a hair faster... it is also for saftey, reliability and weight managment. Especially for anything related to rotational inertia.

They are 'bout seven bones.