Griffin-srt8-300

Hello mopar forum!! So I’m completely new to mopars but am absolutely loving every moment I spend in mine...my car is a completely stock 6.1 hemi but the mufflers are cut for quite a lot of extra noise!! Anyways I need advice on starting modifications. I really want a set of big drag radials in the back so I can launch without traction control on, because on the stock wheels/tires it burns them every time, is this a reasonable modification or am I delusional I’m new to modifying cars but am excited to learn!

thanks

RacerHog

Welcome to the site. Sounds like a lot of fun. But check out some of the YouTube stuff on Hellcat Rear end exploded.
its just something to think about before getting started!!!

wreklus

I don't know if you've ever modded before.
But it's almost always an ongoing process.
In the past, I've spent years planning my next mod and still ended up investing more time and money than I had expected.

Not knowing much about the 300, I couldn't say whether running bigger tires is reasonable. That engine can certainly handle it, but the rest is a mystery to me.
Find out if others have done what you plan to do. See if they follow up after a few months. Sometimes you'll find that things that seem reasonable end up being painful due to driveability or cost or additional maintenance only after the fact.

Either way, I'd recommend your best first step in modding be to pad your savings up in case things don't go exactly as planned.

I can tell you that bigger tires can mean a lot of trade offs:
Less fuel economy
Possibly reduced drivability as a daily driver
Power loss (due to more rotational mass and inertia)
Reduced breaking performance (same as above)

These might not be an issue for you at all, depending upon what you want and how you expect the results to be. But some people have really shot themself in the foot with things the internet might lead you to believe would be easy. That's why I recommend that you try to talk to someone who has done what you plan to do.

Iowan

I will agree spending time on developing a package is probably the most important thing you can do. Parts are expensive so you don't want to be making mistakes.

Griffin-srt8-300

Thanks for the advice guys your definitely right about saving up some money first to plan for any unexpected problems I have heard that I would need to upgrade the rear end in order to compensate for the extra rotational mass I’ll do some extra research and see if I can find any1 who has accomplished this

wreklus

Some nerd levels of thought here:

If the new tires are the same total height as the old, your "effective gear ratio" would be the same. In that case, the total difference in weight would be the only variable.
But,
If the new tires are taller (or shorter) in total diameter than stock,
You'll have a different "effective gear ratio".

I can't remember which direction taller tires would push your effective torque hitting the ground (and I don't want to confuse anyone else with my own confusion).
Maybe someone who knows that stuff well could step in and offer wisdom here...

But that's a riddle you'll probably want to solve before changing your differential.
Tire height effects your toque and speed from a gear ratio perspective.
Tire weight changes the dynamics from inertia.

Griffin-srt8-300

Interesting stuff haha no idea about gear ratios but I’ll give updates and pictures if I end up getting into trying this

Iowan

Here is something for inspiration
http://www.shophemi.com/c-1320-hemi-...nce-parts.aspx
Now you will not be able to sleep tonight. 🙂

RacerHog

The 300 sure is a nice car "I think".... Not sure about yours, But I know the one we had... Had a 2 part Driveshaft. and at one point the coupler gave out and really messed up the undercarriage.... So I'm sure you would also have to go to a 1 piece shaft...

Do you think you could put the underhood supercharger in the car?

wreklus

Would changing the tire size really put that much strain on the driveline?
I know in the Jeep world, people run every tire from 25" height to 37" without changing the drivetrain at all. Even on my Quadra Drive II set up (3 diffs: front, center and rear) I could run 37's and only have to fear breakage from rock crawling.

I mean, it is a good point that probably should be investigated. The Jeep drive shafts and diffs are different from the rest of the RWD sedans from FCA.

My opinion:
If it worries the owner... Have a shop fabricate a new driveshaft out of an alloy that fits your budget and your concerns.

RacerHog

My point was... You change the tire for more bit.... Rite...
And sometimes you over look that and the consequences...
This is a little different format but the same concept..

I'm not saying you cant make it Better !!!!

RacerHog

I could not find the video... But my buds did a deal with Car Craft "Car Craft Week to Wicked".... Was kind of cool... Seen it run at Irwindale....

Iowan

It can be your for some gray poopon that's how classy it is........hahahaha
I like the car that would be a fun driver.
There rear differential is a weak link, it's a Mercedes differential. Back when the platform first cam out I read an arctical were a Dana diff 60 was being manufactured for this setup.