Update on mods - Cherokee SRT8 Forum
WK1 General Performance Discussion If you are planning on modifying your Jeep Grand Cherokee SRT8 with a performance enhancing modification, this is the section to post about it.

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post #1 of 47 (permalink) Old 08-09-2006, 07:09 PM Thread Starter
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Update on mods

Well I got a good part number for a thermostat that will work in our truck. I went to auto Zone and me and the guy that worked there matched up some thermostat's to the factory one. Plus he cross referanced then also just to make sure. They sell Duralast stats and the part number for the 180 is 15478. This stat is a perfect fit and measures out exact I put my digital mic on it. This change alone droped my water temp by 20 degrees. With the a/c on in traffic it ran 215 now it runs between 190-195. The truck is so much more responsive and it cools off alot faster. I feel that this was a great move plus the intake temp droped also. I read the intake temp with my laser reader before and after and it said almost 13 degrees cooler. (thats alot) I bet that air charge senor likes that. Now for my modified factory intake box. I pulled the lower of the box out and removed a piece of the bottom with my die grinder 4" by 5" section. Then I modified the front air deflector by reshaping the way the air comes in. (I opened the front up behind the grill) After that I installed a panel K/N air filter. Then I went for a road test. Let me just say this with these two mods that I did my truck feels alot better. I would have to say atleast 15 hp because any less then that and you couldn't feel it. The other thing is that even after driving the truck around for an hour or so it always has the same amount of pwr and I attribute that to the lower coolant temps.
The throttle response is awesome and my wife could even feel the differance. I can't wait for the cool weather I think this truck could run in the 12s just the way it sits.

Now we need the aftermarket to make a bigger throttle body and undrive pulleys for this truck that could be another 10hp.

Last edited by GRNENVY; 08-09-2006 at 07:12 PM.
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post #2 of 47 (permalink) Old 08-09-2006, 08:08 PM
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Re: Update on mods

Quote:
Originally Posted by GRNENVY
Well I got a good part number for a thermostat that will work in our truck. I went to auto Zone and me and the guy that worked there matched up some thermostat's to the factory one. Plus he cross referanced then also just to make sure. They sell Duralast stats and the part number for the 180 is 15478. This stat is a perfect fit and measures out exact I put my digital mic on it. This change alone droped my water temp by 20 degrees. With the a/c on in traffic it ran 215 now it runs between 190-195. The truck is so much more responsive and it cools off alot faster. I feel that this was a great move plus the intake temp droped also. I read the intake temp with my laser reader before and after and it said almost 13 degrees cooler. (thats alot) I bet that air charge senor likes that. Now for my modified factory intake box. I pulled the lower of the box out and removed a piece of the bottom with my die grinder 4" by 5" section. Then I modified the front air deflector by reshaping the way the air comes in. (I opened the front up behind the grill) After that I installed a panel K/N air filter. Then I went for a road test. Let me just say this with these two mods that I did my truck feels alot better. I would have to say atleast 15 hp because any less then that and you couldn't feel it. The other thing is that even after driving the truck around for an hour or so it always has the same amount of pwr and I attribute that to the lower coolant temps.
The throttle response is awesome and my wife could even feel the differance. I can't wait for the cool weather I think this truck could run in the 12s just the way it sits.

Now we need the aftermarket to make a bigger throttle body and undrive pulleys for this truck that could be another 10hp.
How much for the "stat"? T/b and undrive pulleys....Cobra in you is coming out!!
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post #3 of 47 (permalink) Old 08-09-2006, 09:58 PM
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Re: Update on mods

Thanks for the write-up. I am going to purchase a thermostat tomorrow.
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post #4 of 47 (permalink) Old 08-09-2006, 10:07 PM
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Re: Update on mods

Great info.

Have you noticed any effect on gas mileage?

Any pics on your air box mod?

Thanks!
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post #5 of 47 (permalink) Old 08-10-2006, 01:47 AM
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Re: Update on mods

I'm there tomorrow to pick up that stat.
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post #6 of 47 (permalink) Old 08-10-2006, 07:17 AM Thread Starter
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Re: Update on mods

The stat was like 6 bucks.
So does anyone know if they have a T-body and pulleys for this truck.

Cobra in you is coming out lolol I get it now

Quote:
Originally Posted by 1268
How much for the "stat"? T/b and undrive pulleys....Cobra in you is coming out!!

Last edited by GRNENVY; 08-10-2006 at 08:01 AM.
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post #7 of 47 (permalink) Old 08-10-2006, 07:30 AM
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Re: Update on mods

Thanks for the info.

How hard is it to install?
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post #8 of 47 (permalink) Old 08-10-2006, 08:15 AM
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Re: Update on mods

Any negatives on using this stat....why wouldn't Chrysler put in a 180* from the getgo?? Warranty concerns?? If no negs or warranty concerns I will get one on the way home.
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post #9 of 47 (permalink) Old 08-10-2006, 08:19 AM Thread Starter
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Re: Update on mods

The stat change is very easy. Remove the upper air intake hose first. Then I clamped off the upper hose pulled the stat out removed the gasket from the original stat and put it on the new one. Do not stretch out the rubber ring that goes around the stat. Then I put the neck back on and tighen it up. Now for getting the air out of the system. There is a little pipe plug in the water pump you have to pull it out when adding the coolant so you get all the air out. Once you see coolant coming out of the hole put the plug back in and then just top off the radiator. That ensures that all the air is out and that you won't over heat. After the truck is running warming up for a while. You should here the fan come on and then after it cools the truck off it should go off by it's self. If it doesn't and it starts to over heat you didn't get the air out of the system.
This **** is easy for me I was a tech for a long time.

I did not take pics of the air box modified but if you take it apart and look at it it's self explanatory.

Like I said before these two mods made a big differance in my truck. I believe in modifing the factory air box. With a couple tricks it's not restrictive for this truck at this pwr level and it gets a ton of cool air. You watch and see there will be aftermarket boxes in the near future because it works.


I can't wait to to take this truck to the track once the weather cools off. It runs good in 95 degree humid weather it will be crazy in 60 degree air.
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post #10 of 47 (permalink) Old 08-10-2006, 08:20 AM
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Re: Update on mods

Quote:
Originally Posted by 1268
Any negatives on using this stat....why wouldn't Chrysler put in a 180* from the getgo?? Warranty concerns?? If no negs or warranty concerns I will get one on the way home.
I have pondered this as well. Why not implement the 180 thermostat from the factory?
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