[ghorsepower]

Reading the Drag Listing thread, I know someone mentioned someone having their shift points lowered to prevent hitting the rev limiter. Which i agree is hard to do with a locked PCM in D mode. Or conversely one could hand shift and avoid those rev limiters too? But that 1-2 shift comes quick... And i hate a reverse gate shifter why o why did dodge choose that on these? Push to shift not pull to shift Dodge! Thinking back on Fridays runs there were a few things that did stand out to me in the SS vs the SCAT.

I think on a few of the runs, going from 2-3 most predominantly, the shift was odd. It seemed like it layed over a little then shifted which to me points to me hitting the limiter. (All my passes were in Track mode Trans in D) In my SCAT i had the PCM and TCM tuned by HemiFever in NC. I also had a diablosport data logger which i could go back and review (miss that). The tuned shifts were always spot on and if anyone had an old muscle car the difference in the SCAT with the stock TCM tune and HemiFever tune were like putting in a shift kit in the old cars. Shifts were snappy and sometime would bark tires in the lower shifts. So I am pretty sure i lost a 1/10 or 2 from those shifts in the SS.

Also on most of my runs the air temps were cool (50s) and the DA was good. I had the power chiller on Inter-cooler was in the 50s-60s. I felt like the car was hesitating mid track. Which i prob lost a 1/10 or 2 from that too. Again for comparison if i was getting detonation and a little lean on my SCAT it would get similar esp in hot weather.

The SS has very few miles, just over 500, and I have only put gas in it twice, 93 both times. I think this Friday I am going to try to drop in some 100 with a 1/4 tank 93 to see if the surging goes away.

Some of these may just be the car loosening up but Dodge seems to have done some poor math figuring out the shift points vs rev limiter seems like for some folks?

So now again i sit at the precipice of "I will just leave the car stock and enjoy it" vs "Ok let's get a tune, a pully, some injectors, and a few other things in it"

Oh my dear sad power-train warranty I shall miss you...

 

[Rockster]

Never tried this but read that the way to launch a Hellcat with the A8 is to put the transmission in manual mode, put it into 2nd gear. As soon as one can after launch shove the lever to automatic mode and let the engine/transmission controller handle subsequent up shifts.

Might be ideal for the Scat Pack with the A8, too.

Would suggest before you take the SS to the track you change the oil/filter. Show up at the track with fresh oil in the engine.

 

[moparjim]

It was @dragrcr that lowered the shift point on his SuperStock to avoid the 1-2 shift hickup. This can be done through the BCM so it does not require unlocking the PCM.

 

[Snowman]

I’ve been told my several people it pulls a ton of timing right before the shift. The theory being Dodge had to balance performance with warranty. Hard shifts breaks parts.

 

[rickydeuce]

Hmmmm, I moved mine from 6000 to 6250 in my Redeye.....

 

[JCasey]

Reading the Drag Listing thread, I know someone mentioned someone having their shift points lowered to prevent hitting the rev limiter. Which i agree is hard to do with a locked PCM in D mode. Or conversely one could hand shift and avoid those rev limiters too? But that 1-2 shift comes quick... And i hate a reverse gate shifter why o why did dodge choose that on these? Push to shift not pull to shift Dodge! Thinking back on Fridays runs there were a few things that did stand out to me in the SS vs the SCAT.

I think on a few of the runs, going from 2-3 most predominantly, the shift was odd. It seemed like it layed over a little then shifted which to me points to me hitting the limiter. (All my passes were in Track mode Trans in D) In my SCAT i had the PCM and TCM tuned by HemiFever in NC. I also had a diablosport data logger which i could go back and review (miss that). The tuned shifts were always spot on and if anyone had an old muscle car the difference in the SCAT with the stock TCM tune and HemiFever tune were like putting in a shift kit in the old cars. Shifts were snappy and sometime would bark tires in the lower shifts. So I am pretty sure i lost a 1/10 or 2 from those shifts in the SS.

Also on most of my runs the air temps were cool (50s) and the DA was good. I had the power chiller on Inter-cooler was in the 50s-60s. I felt like the car was hesitating mid track. Which i prob lost a 1/10 or 2 from that too. Again for comparison if i was getting detonation and a little lean on my SCAT it would get similar esp in hot weather.

The SS has very few miles, just over 500, and I have only put gas in it twice, 93 both times. I think this Friday I am going to try to drop in some 100 with a 1/4 tank 93 to see if the surging goes away.

Some of these may just be the car loosening up but Dodge seems to have done some poor math figuring out the shift points vs rev limiter seems like for some folks?

So now again i sit at the precipice of "I will just leave the car stock and enjoy it" vs "Ok let's get a tune, a pully, some injectors, and a few other things in it"

Oh my dear sad power-train warranty I shall miss you...

Don't know if you have made anymore passes or if anything has changed but what you were feeling in the 2-3 shift is the same as my 22 SS and my logs show a large torque hole on the 2-3 shift not present on the 1-2 or 3-4 shifts. Engine torque drops 400 ft-lbs on the 2-3 where the 1-2 is 50 and the 3-4 is 100. These numbers were in Track Mode and Auto. Torque reduction was from fuel and spark not any limiter/ESP based on the Throttle Torque Source PID. If anybody knows how to mod the trans tune via the BCM w/o an ECM unlock I would sure like to know.

 

[ghorsepower]

I did and they continued until recently when I did the Dusterhoff 1077E kit. Of course now with the custom tune it pulls through the full RPM band. But when it was stock it would do it sometimes, maybe 75% of the time? Especially when i hooked good, if i spun it either didnt do it because i got out of it or maybe i didnt notice it because i was trying to keep the front tires actually in-front of the back tires the whole 1/4

 

[JCasey]

Looked up the kit...so you're on E85 now...nice kit. Did you do the install?

 

[ghorsepower]

Looked up the kit...so you're on E85 now...nice kit. Did you do the install?

Yes they have e85 at many locations around me so its easy to get. And yes i did the install along with BMR cradle lockouts and a full AAD dragpack rear link setup.

 

[JCasey]

That's nice...are you on a 15" rear tire

 

[ghorsepower]

No right now 305x45x17s which were great stock but now wont hold. So probably going to go with a 315x55x17s and launch in second or at least that's what Dusterhoff has recommended.

 

[dragrcr]

Don't know if you have made anymore passes or if anything has changed but what you were feeling in the 2-3 shift is the same as my 22 SS and my logs show a large torque hole on the 2-3 shift not present on the 1-2 or 3-4 shifts. Engine torque drops 400 ft-lbs on the 2-3 where the 1-2 is 50 and the 3-4 is 100. These numbers were in Track Mode and Auto. Torque reduction was from fuel and spark not any limiter/ESP based on the Throttle Torque Source PID. If anybody knows how to mod the trans tune via the BCM w/o an ECM unlock I would sure like to know.

Trans tune is done by flashing the TCM. It's all the exact same procedure as tuning the PCM. I used HpTuners. You would only need to unlock the PCM if you want to have actual shift points higher than spec. Because the rev limit on the engine side would need to be raised.

 

[JCasey]

2-1/2" taller and over an inch section width than what you have now. That and 2ed gear launch will reduce the chances of spinning w/ all that new power. I think I saw where someone had put the new 55 aspect ratio tire on and it fit. Can't remember where I read it but do remember checking to see that it was the bigger tire. Let us know how you do.

 

[JCasey]

Trans tune is done by flashing the TCM. It's all the exact same procedure as tuning the PCM. I used HpTuners. You would only need to unlock the PCM if you want to have actual shift points higher than spec. Because the rev limit on the engine side would need to be raised.

Thanks dragrcr...I'm getting closer to understanding. So if you don't have to unlock the PCM (if you stay below the RPM limit and torque limits in the engine tune), all you would need are the credits for the TCM and write to the TCM only?

 

[dragrcr]

Thanks dragrcr...I'm getting closer to understanding. So if you don't have to unlock the PCM (if you stay below the RPM limit and torque limits in the engine tune), all you would need are the credits for the TCM and write to the TCM only?

I had to license the PCM and assign 2 credits as well as the 4 credits for the TCM. I think because the TCM does not have the VIN associated with it or something like that.

 

[JCasey]

I had to license the PCM and assign 2 credits as well as the 4 credits for the TCM. I think because the TCM does not have the VIN associated with it or something like that.

Thanks...so you have to buy the PCM credits in addition to the TCM but it didn't have to be removed and unlocked where a computer code would be set.

 

[dragrcr]

That is correct. You do not have to remove or unlock the PCM. One word of caution. Some tuners want to work with a copy or read of your original PCM&TCM tune. I would avoid this. Just send them a copy of the TCM Tune only if you can. They should not need a copy of the married PCM&TCM tune unless they just want to review it. But for tuning purposed I would use a divorced TCM only read.

If you ARE working with a married copy, when you go to write the TCM, you need to use the drag down menu in the PCM field and select "DO NOT WRITE". SUPER IMPORTANT.

 

[JCasey]

That is correct. You do not have to remove or unlock the PCM. One word of caution. Some tuners want to work with a copy or read of your original PCM&TCM tune. I would avoid this. Just send them a copy of the TCM Tune only if you can. They should not need a copy of the married PCM&TCM tune unless they just want to review it. But for tuning purposed I would use a divorced TCM only read.

If you ARE working with a married copy, when you go to write the TCM, you need to use the drag down menu in the PCM field and select "DO NOT WRITE". SUPER IMPORTANT.

Got it...Hadn't thought about that...Thanks