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Wow, that's quite the difference in overall tire diameter between the two setups, definitely going to feel different driving down the road. Your summer setup sure looks grippy though, just don't get caught in any rain.☔😓

The Proflex ECA looks like a great upgrade. Assuming it's Bluetooth? 🤔
 

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My ECA has a stand alone passive sensor like yours, however I do think it could be possible to utilize the sensor as feedback to the stock ECM with the right tuner.

There looks to be an OEM sensor in the fuel line but it appears to not read as high of ethanol content and very likely designed to only sense E0 - E15. So there must already be an OEM table in the factory operating system that adjusts the stock tune based on ethanol content. 🤔 I cannot confirm this as I am more versed in EFI Live and LS engine tuning but a complete amateur on this HEMI platform.
 

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Yes it looks like your sensor picked right up on the 93 fuel you added which is perfect. My sensor displays an ethanol content change within just a minute or two after refuelling, however I know the engine computer needs much longer to adjust the flex tune before romping on the throttle.
8480


Currious how long does your tuner recommend you "drive easy" on the 93 octane before the flex tune is fully adjusted for it? Also wondering how long it took for your dashboard AFR reading to change for the 93.

And forgive me (can't remember) but what upper/lower pulley combo are you now running since you switched out tuners?
 

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Oh wow that motor must be a torque monster at 426 c.i. Can only imagine what it would be like with more boost, likely go from a HellHawk to Godzilla. o_O

Wouldn't want to spin the stock blower much faster though so you are likely heading towards a larger Demon blower one day if you find the itch to see what would happen with more boost.(#💸💰💸) 😀

When you had the s1025 flex fuel tune did you ever run straight 93 octane or a mix of 93/E85?
 

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Wow, that's quite a smorgasbord of fuel to choose from. I can't believe you can buy so many different octane levels of ethanol free gasoline, nor understand why they would carry so many options either. 🤔
We get one choice of ethanol free called "recreational gas" that is typically only 90 octane and $1 or more per gallon over "premium" E10 93 octane. 🙄

So how noticable is the power difference/loss going from E85 to 93 octane now that you have switched?
 

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not sure the difference between 93 and E85 but from 91 to E85 is night and day. It feels like 100HP difference but I was told by Thawmike (member here) that its around 80 HP difference.
I 100% believe that even though it feels like more.
Thanks for the input, I am still running on 🌽 E85. However it was 36F this morning warming up to 50F today, it will be up to 74F on Thursday then back down in the 40s on Saturday. 🙄

Not sure when to switch to 93 to advoid cold starting issues I hear about? I may just run a mixture of E85 and 93 during the cold winter months (flex fuel tune) instead of running straight 93 octane.

I know you guys are in warm states, but any input to what is a good in tank "target" E content number to hover around for good cold weather starts while also keeping the additional octane benefits of ethanol? Not worried about producing max hp as it just spins all 4 tires in the cold anyway.

Have read anything from say E60 and up you are getting the main knock resistance benefits of running ethanol (just not full hp output).
 

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Not cold here either but that fiinterchiller can replicate the scenario and it does seem to cause issues when starting. I'd start an individual thread about this particular issue or search it. I think it’s been discussed before. Google will even take you to the proper thread. Cheers.
Yes, I have the larger "race spec" Killer Chiller interchiller setup that can get the the intake air stupid cold, however I am not running the a/c system since it has been in the 40s around here lately. 😨

Oh, and I found quality E85 last week for 1.53/gal so I thought I won the lottery. 😃 Used the GasBuddy app with the selected fuel type as E85 to find it ....... because the built in Jeep navigation doesn’t show prices for E85 obviously.
 

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yea I get that part but why would I want it on high now in winter? or even in the summer why would I want it on high first thing in AM. I kinda get it in summer your keeping it at starting temp longer so it wont heat up as fast but its still gonna get there no matter what? am I missing something?
All good discussion here..... in saying that, yes you do need airflow for the heat exchanger work cooling everything off. However you should not need your fans on high all the time, especially right at startup. Now that is assuming you are talking about your radiator fans and not the in-cabin HVAC fan correct?

My tune has the radiator fans running on high only when very warm outside or after extended periods of idleing on very warm days. That only lasts a few mins then they slow right back down from the highest fan speed to low speed again. (Tune for 180°F thermostat)

Oh and my AC cabin temperature is very cold like stock on hot temperature days.

I would first look to see if you can better optimize the system you already have.

You could have the refrigerant charge checked in your system to see if it is possibly low before spending more on a stage 2 system.

I have extra pipe insulation on the A/C and chiller tubing and maybe that is helping me on hot days? I know it's "COOL" to be able pop your hood and show your buddies the frost buildup on the intercooler coolant lines. But that is just a place of thermal loss that could be insulated to improve performance and put less strain on the total A/C system possibly affecting in-cabin performance.

Also what refrigerant is in your A/C system? Some installers switch refrigerants when installing a chiller system to save money, but I am not sure you can do that and not suffer a system cooling performance loss. Mine is recharged with the same refrigerant as stock. Y1234 IIRC
 

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Do you have the FI thermal supercharger spacers installed? I just pulled off my supercharger and in the process of installing the S/C spacers on my Hawk to further increase the chiller performance by reducing the heat load strain put on it.
 

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I emailed kirk last night about the stage 2 and he called me back instead. dude has the best customer service. he mentioned to look at refrigerant levels. I used stock stuff also.
he also mentioned to check sensor placement. I will check both of these but I know they are good my IC temps are low. I know my problem I drive in stop and go traffic. I have a 15 min drive to and from work but its stop and go all the way. I am gonna check the fan setting also. Kirk didnt think I needed the stage 2 just turn fans on. He said stage 2 is more for serious racers or people that live in AZ etc. it gets hot here but not AZ hot.
Yes the stop and go traffic would be the worst aspect of trying to keep your cabin cool in the summer heat. As you know you need plenty of airflow across the A/C condenser to cool effectively.

Another question as I cannot remember, what hood do you have? My raised cowl Black Ops hood lets a ton of engine compartment heat out of the back of it. The rear raised cowl portion near the windshield is open enough I can actually see the top of the supercharger lid while driving. It acts like a chimney pulling trapped engine heat out even sitting at a stoplight.

I was concerned at first so much cowl area heat may get pulled into the inlet at the base of the windshield and affect cabin A/C cooling. But it has proven to not be an issue.

Lil Hemi, sorry for derailing your thread. Always concerned about posting photos in someone elses build thread and cluttering it up, so I can easily delete these later.

8804


8805
 

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My hood is stock. I like that hood you have I am just to lazy to deal with that. or did yours fit no issues?
I like the wrap you have also. you need some carbon fiber front and back spoilers tie it all in.
I love the hood as it helps remove excessive engine heat and the carbon weave dark and light colors match even better than expected with the wrap color, black grill and the factory titanium grill ring color. The fit of the Black Ops hood was fantastic with no installation issues. Just don't buy a hood from Russia. 🙈

And I am way ahead of you on the matching carbon rear pieces. 😉 Already pulled off the viny wrapped Sarona mid spoiler and replaced it with a glossy carbon fiber one from Black Ops that matches the hood perfectly. Also ordered the upper carbon Black Ops wing back on Thanksgiving, just waiting on it to arrive.
8807


Automotive design Automotive tail & brake light Automotive exterior Fender Trunk
 

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Ok gang, update on Lil Hemi. Jeep has been at the tuners for a hot minute to resolve the fuel pump issues I’m having when making long left turns with less than half a tank of fuel. The Jeep will cut out hard sometimes and we know it was fuel pump related. They found a piece of the secondary fuel pump assembly had broken off and was floating around in there as well as a cracked transfer hose on the passenger side. Then we sent the whole unit back to Fore to so they could give it a full examination to make sure we don’t have any further issues. Fore found a clogged Venturi and shipped it back the next day. I should be able to pick it up this Friday. I can’t wait to start stopping at the gas station every other day again.
Argh, you have definitely been dealing with some nagging issues since the installation of the FORE system. I hope it will all be resolved soon for you. Thanks for continuing to update your build post as it will help others in the future with similar fueling issues.
 

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LO
Yeah, story of my life. Lol.

At the end of the day, what’s important is that the team at Fore and the team at Peitz Performance have been amazing, especially Alex Peitz. That guy is awesome when it comes to taking care of his clients!! I can’t wait to see what this thing can really do. Blowing an engine made me a bit shy of my right foot for a while and then COVID hit, so everything pretty much shut down anyways. Now that things are getting going again, it’s a good time to get everything finalized.

it’s the summer of Hemi!!

LOL 😆 Love the Summer of George reference!

You are in good hands with Alex from everything I have heard about him. 👍

Lot of people just say "what's it run?", what really matters is not what they think but how comfortable you are with the build, having confidence with it and that it stays together of course so you actually drive it.

I would be hesitant after an engine failure also and being slow with gaining confidence in the current build is the smart approach. You are definitely covering your bases getting all things sorted out to where you are feeling at ease.

After pulling my supercharger again for some porting, polishing, adding FI thermal spacers, insulating, dual BAP and reworking my ethanol sensor content fuel path I am slowly gaining confidence with opening the throttle on the current build and tune. It has helped to data log fuel pressure and injector pulse width against boost psi to comfort myself that there is plenty of fuel capacity reserve on ethanol before pushing it very hard.

I appreciate your sharing of the Lil Hemi build as it has helped me personally think through my build choices and provide motivation taking extra safety measures for long engine life.

Looking forward to hearing about your progress when Alex is all done. 👍
 

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Came out of work this morning to a flat, glad to have that tow package. Then I got home to no electricity. Gotta love that Texas power grid 👍🏼

Argh! Sucks to have a flat anyday. I just ditched the runflats to install my new forged wheels and MPSS tires on the Hawk. So happy I have the spare tire option like you do more than ever, but hoping I never need to test it out. 😉
 

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Will a 22” spare fit in the wheel well?
Why would you do that? 🤔 I am running 22s now and still have my OEM 20" spare in the back. No need to change the spare as the OD is the same as the new 305/35r22 tires. Differentials and the transfer case do not care about the wheel diameter only the OD of your tires.

So technically a 22" spare would fit if you keep the tire OD the same as the OEM 20" spare tire. But you would need a narrow tire and narrow width 22" wheel to fit under the cargo flooring as the spare tire well is quite shallow in depth.
 

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I'm running 305x35 r22's with Michelin Super Sports and love the grip.
Running the same 22" 305 MPSS as adamkc, better ride than the 3 season Pirelli run flats but she still spins all 4 tires through 1st and 2nd like you will be doing with your 427. Love the aggressive look of wide 305 tires if you get wheels with about 1" less offset to push them out flush with the fender lips. 👍
 
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