ATI 10% Damper with Dyno (updated on page 3 for 2.85 upper, 1300 injectors and tune)

[FULLTHROTTLERICK]

We have had this conversation before. This has nothing to do with the absolute value of boost or what A dealerships preferences are.

1. Any motor warranty work for a blown motor or blower goes straight to Stellantis for approval and the PCM data gets sent. Folks on here who work at the dealerships have confirmed this. The dealership could be the best in the world to work with but it doesn’t matter. My dealership has looked the other way on every warranty repair including the driveshaft despite them knowing I’m tuned. But they have said if anything requires Stellantis approval then I’m SOL.

2. Boost changes with altitude because blowers operate on a fixed compression ratio that is tied linearly to their RPM which is dictated by the pulley ratio. Changing pulleys changes blower RPM and the pressure ratio. Yes you could pulley up at higher altitudes and still be less than the stock boost level. But it would be immediately apparent by looking at the ratio between MAP1 and MAP2. Therefore Stellantis knows you changed the blower RPM and your warranty is void.

Maybe the (warranty) people at Stellantis arent this smart?!

AZD = Always the voice of reason for us trying to play but not pay haha. We need you to keep us in line. And keep the air in Scuba’s tank

 

[Mack0092]

Those ATI 10% lowers are the balls, I have one on my hellcat Challenger 6MT. Went from 637whp to 771 whp with the 10% lower, injectors, tune and catless (93 octane) . I could not believe the results. I have the DT 877 package on my TRX (upper, injectors, tune) and that is also very impressive.

Tune that bad boy and let her rip!

 

[jshvttlesworth32]

Those ATI 10% lowers are the balls, I have one on my hellcat Challenger 6MT. Went from 637whp to 771 whp with the 10% lower, injectors, tune and catless (93 octane) . I could not believe the results. I have the DT 877 package on my TRX (upper, injectors, tune) and that is also very impressive.

Tune that bad boy and let her rip!

What upper pulley size are you using with your 10% lower? I’ve talked to DUSTERHOFF and they are saying with their DT937 kit, a lower is not needed.

I keep asking them what supporting mods do I need to safely run their 91/93 octane and e85 and they said nothing is needed besides what is offered in their package. Wondering if their tune is really tried and true as others have said.

 

[AZDinoPwr]

What upper pulley size are you using with your 10% lower? I’ve talked to DUSTERHOFF and they are saying with their DT937 kit, a lower is not needed.

I keep asking them what supporting mods do I need to safely run their 91/93 octane and e85 and they said nothing is needed besides what is offered in their package. Wondering if their tune is really tried and true as others have said.

 

[RamTrxUSA]

View attachment 141207

With what you stated about what dealers are now having to do for any engine repair. This would mean the predator pulley which is 6% I believe would void the warranty as well?

 

[Sinister4]

Same deal as doing a piggyback on Audi, BMW or Porsche if the ecu gets sent in the warranty is Void...they can always find out IF they really want to. I use my method you want warranty you leave it BONE STOCK and drive it or forget warranty and go crazy power.

 

[DirtMcGirt8732]

View attachment 141207

So, I’m starting to get a parts list together for my first round of power mods. As far as pulleys go, I’ve been debating a 2.85 upper vs the ATI 10% lower. I’ve done a fair amount of reading on the Hellcat forum and saw this chart over there. I can see the blower is spinning just a little harder with the 2.85 upper. Here’s my question: What is the real world performance difference between the two on a 93 or Flex setup?

My thoughts were the lower install seems to be easier and I like the idea of keeping the OEM clutched upper pulley. It seems to me the performance difference would be negligible. Is there any merit to this or am I overthinking it?

@AZDinoPwr Help a brotha out

 

[DirtMcGirt8732]

Same deal as doing a piggyback on Audi, BMW or Porsche if the ecu gets sent in the warranty is Void...they can always find out IF they really want to. I use my method you want warranty you leave it BONE STOCK and drive it or forget warranty and go crazy power.

I’ve debated this with several people on FB regarding the JB4 and many just don’t want to believe it lol. Even some alleged “tooners”. You can spoof sensors but you can’t magically make more horsepower. There will absolutely be signs on the PCM for anyone looking

 

[Sinister4]

I’ve debated this with several people on FB regarding the JB4 and many just don’t want to believe it lol. Even some alleged “tooners”. You can spoof sensors but you can’t magically make more horsepower. There will absolutely be signs on the PCM for anyone looking

Yup agreed some will not believe it no matter what, so I just dont get into it anymore lol

 

[Mack0092]

What upper pulley size are you using with your 10% lower? I’ve talked to DUSTERHOFF and they are saying with their DT937 kit, a lower is not needed.

I keep asking them what supporting mods do I need to safely run their 91/93 octane and e85 and they said nothing is needed besides what is offered in their package. Wondering if their tune is really tried and true as others have said

What upper pulley size are you using with your 10% lower? I’ve talked to DUSTERHOFF and they are saying with their DT937 kit, a lower is not needed.

I keep asking them what supporting mods do I need to safely run their 91/93 octane and e85 and they said nothing is needed besides what is offered in their package. Wondering if their tune is really tried and true as others have said.

My hellcat with the 10% lower has a stock upper pulley. The Hellcat was tuned by a local tuner, not Dusterhoff.

 

[Wil370]

I didn’t see a lot of threads on this so thought I would post up my results. I had an S&B intake but other than that no performance upgrades. I talked to a few shops in Houston and decided to install the ATI lower balancer/damper whatever you call it. No tune, stock injectors, etc which I understand could be a small risk. Just didn’t feel like voiding the warranty yet.

My guy included before and after dyno pulls. The 80 hp/60tq was better than I expected. Dyno attached below. This was done as rear wheel dyno which I think I read gives bigger numbers than actual? As you can tell I’m not super technical. Gauges showing a 2 psi bump in boost over what I was seeing previously. 8000 miles on my 2023.

Bracing myself for the no tune criticism

View attachment 122691

Are you still running this set up?

 

[Steve Rollin]

Are you still running this set up?

I am. I’m really happy with it and haven’t had any issues and have about 19,000 miles on the truck now. I do think about tuning it properly from time to time but just haven’t gotten around to it.

 

[Wil370]

I am. I’m really happy with it and haven’t had any issues and have about 19,000 miles on the truck now. I do think about tuning it properly from time to time but just haven’t gotten around to it.

Good to hear ! So the truck is completely stock besides the 10% ATI? Also what’s your total psi at wide open throttle ?

 

[Steve Rollin]

Good to hear ! So the truck is completely stock besides the 10% ATI? Also what’s your total psi at wide open throttle ?

I have an S & B intake but otherwise bone stock. I see 12 psi WOT. I was seeing ten before. I’ve done launch control a few times and I think my best showed 3.8s? I will go check if that sounds like bs. No idea if that is accurate at all either. I had two friends in the truck and hunting equipment and a beer weighing me down.

 

[Wil370]

I have an S & B intake but otherwise bone stock. I see 12 psi WOT. I was seeing ten before. I’ve done launch control a few times and I think my best showed 3.8s? I will go check if that sounds like bs. No idea if that is accurate at all either. I had two friends in the truck and hunting equipment and a beer weighing me down.

Nice yeah my truck is right at 10psi now too so 12 would be perfect are you on 91 octane too?

 

[Steve Rollin]

Nice yeah my truck is right at 10psi now too so 12 would be perfect are you on 91 octane too?

93. Texas

 

[JKMTRX]

Aren't the incognito and predator only 6% and ATI 10%? I thought on stock tune max you would want to safely run would be 6%.

 

[Wil370]

Aren't the incognito and predator only 6% and ATI 10%? I thought on stock tune max you would want to safely run would be 6%.

No expert here but I assume it comes down to psi being made , my truck is only making 10 with added 2-3 from 10% lower I’m still under what most other 6% lower guys are making some claim 14 psi and are fine. I’m a little higher elevation so no tune should be ok? I’ll probably get it dynoed to verify

 

[JKMTRX]

No expert here but I assume it comes down to psi being made , my truck is only making 10 with added 2-3 from 10% lower I’m still under what most other 6% lower guys are making some claim 14 psi and are fine. I’m a little higher elevation so no tune should be ok? I’ll probably get it dynoed to verify

Ah yes elevation does play into the boost levels. I am at sea level and with S&B and Preditor i was at about 12.5 - 13psi. About 6 months after i ended up having ATI 10% lower, ID1300CC injectors, BAP, upper and could other things done and flex tuned with dusterhoff. I've run E85 since tuned (about 11.5k miles since) and will touch 17.5 psi with my setup.

 

[Steve Rollin]

This thread bump last month really cost me. I started thinking it would be fun to squeeze some more power out since it’s been a year or so and you know how you start to get used to things. Talked to my same shop and I’m going back in to do:

2.85 upper pulled
1200 cc injectors
Proper tune, for 93 octane only at this point

Will report back in a few weeks with dyno numbers (unless they are bad).