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  #1  
Old 08-13-2014, 11:27 AM
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GTHAUS Performance Thread

Ok, performance reviews on GTHAUS systems are sprinkled throughout the forum and there are a lot of questions. This is an attempt to centralize the results. I'm going to use acronyms from this point forward.

I'll start. We've been debating GTHAUS in open, in closed versus stock as well as other systems. The general consensus is Open Mode (OM) is slower off the line than Closed Mode (CM), but faster on the freeway. This is allegedly a result of more HP from OM but less Torque.

Today I decided to do a test and the results have revealed more variables to me. OM and CM are one thing to compare, another significant factor is Launch Control (LC) whether by the feature or your foot, and Mash the Gas (MTG). Previously my tests were done with LC. This morning was different.

I get the mail for my work every day. There is a nice/safe little test strip in route. Plenty of room for 0-60. Results are on 3/8 tank of gas, 93 Octane. Below I have an attachment of the weather conditions.

Run 1: On the way to the mail (4 mile round trip) I was in CM. I stopped and MTG. No LC. 0-60 in 4.8 seconds. Continued to the mail.

Run 2: 10 minutes after Run 1. Engine was shut down for a few minutes. I opened the exhaust before I parked to get the mail. My reasoning for this was to have the computer prepared for it. So when I started up it was already in OM. Back to the spot. Came to a complete stop. MTG. 0-60 in 4.6 seconds.

Now I'm confused. All the testing I've done with LC the Open Mode has been slower to 60 than the CM. Now I don't use LC and just mash the gas and OM is faster than CM.

I'm going to wait a week or so and then I will retest same conditions with LC both times to confirm my findings.


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  #2  
Old 08-13-2014, 03:52 PM
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Re: GTHAUS Performance Thread

Honestly, I would rather see the dyno numbers if this is true or not. I understand dyno racing means nothing but it could be that closed mode has a slight bump in HP and torque but in open mode you have higher HP and lower torque (and why it might feel slower, initially, off the line)...
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Old 08-14-2014, 11:15 AM
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Re: GTHAUS Performance Thread

I did another test this morning, this time with LC in both CM and OM. Same order, CM first, then OM. The difference today is the weather (obviously) and I did not let the Jeep cool between runs at all. In fact I sat in the bank drive-through for about 10 minutes before driving to do the next run.

It's also worth noting I have 16k miles on my stock all seasons so needless to say they are not gripping well.

Today's runs were with 1/4 tank of gas.

Run 1: CM. I used LC. 0-60 in 4.7. Considerable tire spin

Run 2: OM. I used LC. 0-60 in 4.6. Less tire spin than CM

This is contrary to my findings in cooler weather. Here is my theory, the lost low end torque is actually helping my 0-60s right now because I have very little grip...meaning the lack of torque is allowing the tires to grip better long enough to where torque does not matter quite as much. This may not make sense but it's the best sense of it I can make. I'm curious to here some expert opinions.

Once my 22s arrive and I get fresh rubber I will retest both of these scenarios. It should still be hot so that will be a good data set. Then I will do it again in the winter.

I'm also curious to re-do all test in reverse. OM first then CM. Maybe the difference would have been even greater.


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Old 08-14-2014, 11:28 AM
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GTHAUS Performance Thread

How are you getting wheel spin in LC in CM are your tires that bald ? Or you have traction control off or disabled , and what mode you in ? Track or sport or doing manual shifting ? Bit more info please, been doing a lot of LC myself which I'll post some pics later but never once had traction loss ? Also how much fuel in the tank and do you have spare tire and crap in or out ?


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Old 08-14-2014, 11:38 AM
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Re: GTHAUS Performance Thread

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Originally Posted by maxy9 View Post
How are you getting wheel spin in LC in CM are your tires that bald ? Or you have traction control off or disabled , and what mode you in ? Track or sport or doing manual shifting ? Bit more info please, been doing a lot of LC myself which I'll post some pics later but never once had traction loss ? Also how much fuel in the tank and do you have spare tire and crap in or out ?


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I wouldn't say my tires are bald. I've honestly been getting wheel spin since 7 or 8k miles on the tires. More in the winter than summer. One thing I can say is wheel spin is hard to detect in these if you don't know what you're looking for. The more time you spend with the Jeep the more you'll be able to pick up on it. It does not make any sound. It's just a feel.

No manual shifting. All of my tests are done it track mode. I've done enough tests to say without a doubt Track Mode (TM) is faster than Sport or Auto. This only applies to the '14. Apparently the 12-13 are completely different in this regard.

I put fuel level in the first set of runs (3/8th tank). Today's runs were with 1/4 (2/8) tank. Spare tires and tools are out. Everything else is in...floormatts, cargo cover, etc.

I'm unable to edit Original Post to address these parameters.
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Old 08-14-2014, 11:44 AM
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Re: GTHAUS Performance Thread

Loads of variables and I expect worse times with 22's honestly JMO

An AWD Mustang Dyno is really the only way to test this theory IMO

1-2Hp is not gonna set records since comparing 1 exhaust to the next or throwing rough stats IMO is relatively just a good talking thread and discussion so heres my contribution Haaa.


For instants on my car I blew out the cats and the car was tuned with cats I'm sure a new tune will do minimal to noting seeing I have 750HP 1-2HP means noting ya know? Honestly that's what we are talking here not 30-40HP and that's a fact. Open Mode will defiantly yield a loss in HP if your not making power. If your losing bottom end that's because their is not enough back pressure in OM their fore will you gain on the top side in OM this is why the TT do cutouts after the Headers or dump out the fender or hood. Now get a real tune not some mickey mouse canned tune when tuning finally opens fully and not what they say is full tuning I mean when it's really opened up like the 05-10's and let the adaptive's learn your driving and open mode will be a whole new cup of tea.
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Old 08-14-2014, 11:50 AM
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Re: GTHAUS Performance Thread

Thx for that mate I was just curious as to what was going on , wasn't trying to be pushy or demanding I just can't feel my wheels spin but maybe they are ? But I do feel the launch Yee Haa love it when the whole front end lifts up . When I get around to it I was just going to post pics of my SRT pages ,like my best time and the times in OM,CM and using LC the whole time


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Old 08-14-2014, 11:56 AM
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Re: GTHAUS Performance Thread

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Originally Posted by maxy9 View Post
Thx for that mate I was just curious as to what was going on , wasn't trying to be pushy or demanding I just can't feel my wheels spin but maybe they are ? But I do feel the launch Yee Haa love it when the whole front end lifts up . When I get around to it I was just going to post pics of my SRT pages ,like my best time and the times in OM,CM and using LC the whole time


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HAHA no worries. I wasn't trying to be a dick. I think it just sounds that way because of the typing. I enjoy discussing these things.
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Old 08-14-2014, 12:02 PM
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GTHAUS Performance Thread

Yea your dead right Chad in your comments , I just keep fighting myself in which way to go next spend more money on a SC for that extra kick or leave the car alone because it's quick enough and start rebuilding a classic muscle car . What car you have Chad that has 750hp ? Any pics just curious as I love to look at pics :-)


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Old 08-14-2014, 12:05 PM
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Re: GTHAUS Performance Thread

@ Chad. I'm very curious to see how much 22s affect my performance. I can't find detailed tire weights but the 305/35r22 Pirelli is allegedly lighter than the 295/45r20 run flats. Also, my wheels are 3 piece forged with polished lips and brushed centers and are also (supposedly going to be) lighter than stock.

Now I know that the rotating mass will be higher as the rims have metal out further from the center than the stock...but being that the setup should be lighter I'm hoping the effects will be negligible.
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Old 08-14-2014, 12:06 PM
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Re: GTHAUS Performance Thread

All good A-kon I love to talk about how people do things as well mate it's the only way we learn


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Old 08-14-2014, 12:34 PM
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Re: GTHAUS Performance Thread

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Originally Posted by maxy9 View Post
Yea your dead right Chad in your comments , I just keep fighting myself in which way to go next spend more money on a SC for that extra kick or leave the car alone because it's quick enough and start rebuilding a classic muscle car . What car you have Chad that has 750hp ? Any pics just curious as I love to look at pics :-)


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I have my own opinions about SC the 2012+ hemi's. Honestly I rather keep to myself and off the forums but Feel free to call since I have already told vendors stuff I should't have and they take it as their own knowledge so Phone is really the only way I will share my views.

I will say this I don't sell a kit for a reason And it's not because I couldn't have one built or tuned by one of the best tuners in the country and not anyone affiliated with Diablo.

And yes this is one of my toys this one is the most fun it's my garage queen LOl.



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@Akon guess we will see.
What wheels did you go with I feel the 22's even lighter will have a harder time spinning and for drag time their will be no improvement but hey only tests like your doing above will tell right
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