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Topic Review (Newest First)
02-15-2013 01:44 PM
mountainneer
Quote:
Originally Posted by rics1997 View Post
It all depends on why you want to re-gear. I have 4.88's with an Auto myself. It is my dd and I like to hit the trail when I can. I found that 4.88 aren't a great highway gear set especially since I have 33's. One of the reasons I am getting 35's. I think 4.88 and 35's are a good match for a all around gearing. Now if it is a strictly road vehicle then 4.88 may still be a little much but is still a good choice. For dd and trails, it is a great match with 35's. But if it is for towing and trails, then 5.13's may work better when running 35's. But really 5.13's to me are more for 37's.
Its a daily driver, but we try to hit the trails a couple times a month. We don't do any crazy stuff anymore. We are running 35's with 373 gears, automatic and 4 door. Dont know if that makes a huge difference. Definitely need to re-gear.

Thanks for the advise
02-14-2013 11:57 PM
rics1997
Quote:
Originally Posted by mountainneer View Post
Would 488's be a better choice for the automatic...??
It all depends on why you want to re-gear. I have 4.88's with an Auto myself. It is my dd and I like to hit the trail when I can. I found that 4.88 aren't a great highway gear set especially since I have 33's. One of the reasons I am getting 35's. I think 4.88 and 35's are a good match for a all around gearing. Now if it is a strictly road vehicle then 4.88 may still be a little much but is still a good choice. For dd and trails, it is a great match with 35's. But if it is for towing and trails, then 5.13's may work better when running 35's. But really 5.13's to me are more for 37's.
02-14-2013 11:45 PM
mountainneer Would 488's be a better choice for the automatic...??
02-14-2013 11:03 PM
MTH
Quote:
Originally Posted by jkjeeper06

With 35's and a 3.8L I'd consider 4.88 or 5.13's too those will wake it up even more
I'd say that's too much for a manual. I don't have my chart handy, but anticipating they're really 34" tires, my recollection is 5.13s would have you at right about 3k at highway speed--too much IMO.

Quote:
Originally Posted by mountainneer

I heard 5.13's for an automatic...???
Yeah. Deeper the better there.
02-14-2013 10:22 PM
mountainneer
Quote:
Originally Posted by jkjeeper06 View Post
With 35's and a 3.8L I'd consider 4.88 or 5.13's too those will wake it up even more
I heard 5.13's for an automatic...???
02-14-2013 10:09 PM
jkjeeper06
Quote:
Originally Posted by MTH

As Daggo said, forget the tuners--you need to regear. Put in 4.56s and it'll wake right up.
With 35's and a 3.8L I'd consider 4.88 or 5.13's too those will wake it up even more
02-14-2013 09:53 PM
Rtone1583 Supercharger!

As was stated further up though, increasing the horsepower alone isn't going to satisfy you as the peak HP rating is up the 4K plus range on the 3.8.

Regear it first to see if that accomplishes what you want.

Then start chasing HP. Just be ready to drain the bank because truly noticable HP gains are the single most expensive mod on any vehicle.
02-14-2013 12:29 PM
Raiderfan001
Quote:
Originally Posted by Duramaxxed View Post
So you're telling me that if an Engine is Re-Tuned to Run on 93 rather than 87, you're not going to Gain any Power what so ever?
I see no noticeable difference between the 87 performance tune and the 91 performance tune. Both are better than no tune but when I was running the 91 and changed to the 87 it felt exactly the same.
02-14-2013 11:03 AM
rics1997 Re-gear, re-gear, re-gear

Really, there is no real hp gains with the 3.8 without completely rebuilding it. Several manufacturers have published what they did to get some gains but the best any dyno has shown was 10 hp and they added headers, Cat back, CAI, and used a tuner. ANd even then that hp gain was at 4600 rpms. At normal rpm range it was more like 2-3hp gains. And Superchips claims they gave most of that according to their dyno.

Now Superchips does give other advantages on a 3.8 which includes a small hp gain, better fuel mileage about 1mpg, and better throttle response. In advanced mode you can even change shift points and other setting for a little better performance but you have to know what your doing to use advanced features.

Saying that, your best bang for the money is RE_GEARING. You don't get more engine hp but what you do get provides you more hp by putting your engine in a better hp to rpm range. Since you will be running at higher rpms to a given speed, you will see better hp because of the steep hp to rpm's on the 3.8.
02-14-2013 11:00 AM
MTH
Quote:
Originally Posted by challrph
How should I go about getting more horsepower on my 08 unlimited rubicon 6-speed manual (lifted/35s)? I've heard the diablosport trinity tuner will increase hp by about 80? Any ideas? I wouldn't mind increasing fuel economy too, but getting more horsepower is my main concern.
As Daggo said, forget the tuners--you need to regear. Put in 4.56s and it'll wake right up.
02-14-2013 10:55 AM
Duramaxxed
Quote:
Originally Posted by Raiderfan001 View Post
Higher octane gives no benefit in an engine not built for it.
So you're telling me that if an Engine is Re-Tuned to Run on 93 rather than 87, you're not going to Gain any Power what so ever?
02-14-2013 10:52 AM
Raiderfan001 Higher octane gives no benefit in an engine not built for it.
02-14-2013 10:42 AM
Duramaxxed
Quote:
Originally Posted by Raiderfan001 View Post
No
You're not gonna get a 15-20hp Gain Running 87.
02-14-2013 10:33 AM
Raiderfan001
Quote:
Originally Posted by Duramaxxed View Post
On a Diesel you'll get about 80hp, but on the Jeep, mayyybe 15-20hp. But in order to get that much, you're gonna have to Run 93.
No
02-14-2013 10:30 AM
Duramaxxed
Quote:
Originally Posted by challrph View Post
How should I go about getting more horsepower on my 08 unlimited rubicon 6-speed manual (lifted/35s)? I've heard the diablosport trinity tuner will increase hp by about 80? Any ideas? I wouldn't mind increasing fuel economy too, but getting more horsepower is my main concern.
On a Diesel you'll get about 80hp, but on the Jeep, mayyybe 15-20hp. But in order to get that much, you're gonna have to Run 93.
02-14-2013 10:21 AM
daggo66 You heard wrong. Your issue is gearing.
02-14-2013 10:20 AM
challrph
Increase horsepower on 2008 unlimited rubicon, tuner?

How should I go about getting more horsepower on my 08 unlimited rubicon 6-speed manual (lifted/35s)? I've heard the diablosport trinity tuner will increase hp by about 80? Any ideas? I wouldn't mind increasing fuel economy too, but getting more horsepower is my main concern.

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