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[Scratch]

I was going to wait a bit before I gave my thoughts on the Magnuson Supercharger and to let Pettys garage address any little issues that may have come up.
Well I did have driveability issues from the get go. Got in touch with Pettys as they are doing the tuning for it and got one revised tune back from them which did not help and talked to them about some of the issues again and was mentioned that the current tune is set to stock configuration. I have 37's with 4.88 gears. They said they would get in touch with Magnuson and verify some changes they wanted to make for the aftermarket parts. That was just about a week ago and nothing, not a word. So I assume that avenue has dried up.
Issues are the light switch feel from a start and when you slow down and take back off without stopping completely, dead pedal then POW! away you go. Issues with it not wanting to go into 8th gear and hold. Going down the interstate at 77 mph, it will finally go into 8th and then any little load or maybe even just for the hell of it it will drop out of 8th. Then maybe go back in or just stay in 7th.
Now at 60 mph and any headwind just forget 8th gear. It hunts between 6, 7 and 8th so bad it pisses you off. It will go up to 7th, then maybe 8th, right back into 7th and sometimes even drop into 6th then right away into 7th. Back and forth and back and forth.
It is actually to the point I hate it. It drove better without the supercharger and held 8th better in stock form.
I am working with someone that understands programming much better than me and I am sure he will be able to get it, but as of now and if he can't I may just yank it off and go back to stock. Oh, plus I have lost about 3 mpg since installing it and that is not because of hot rodding it just everyday driving.

I had a Spintex on my 2007 JKU that was a problem and when these came out and hearing the good responses about it. Plus thinking that everything has come along so much I thought I would give it a try, kind of wish I hadn't.

I will come back to this and update it. Either way, good or bad. So it does not become an open post and others can use it in there decision making.

Thank you for the information!

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[Membrain]

I was going to wait a bit before I gave my thoughts on the Magnuson Supercharger and to let Pettys garage address any little issues that may have come up.
Well I did have driveability issues from the get go. Got in touch with Pettys as they are doing the tuning for it and got one revised tune back from them which did not help and talked to them about some of the issues again and was mentioned that the current tune is set to stock configuration. I have 37's with 4.88 gears. They said they would get in touch with Magnuson and verify some changes they wanted to make for the aftermarket parts. That was just about a week ago and nothing, not a word. So I assume that avenue has dried up.
Issues are the light switch feel from a start and when you slow down and take back off without stopping completely, dead pedal then POW! away you go. Issues with it not wanting to go into 8th gear and hold. Going down the interstate at 77 mph, it will finally go into 8th and then any little load or maybe even just for the hell of it it will drop out of 8th. Then maybe go back in or just stay in 7th.
Now at 60 mph and any headwind just forget 8th gear. It hunts between 6, 7 and 8th so bad it pisses you off. It will go up to 7th, then maybe 8th, right back into 7th and sometimes even drop into 6th then right away into 7th. Back and forth and back and forth.
It is actually to the point I hate it. It drove better without the supercharger and held 8th better in stock form.
I am working with someone that understands programming much better than me and I am sure he will be able to get it, but as of now and if he can't I may just yank it off and go back to stock. Oh, plus I have lost about 3 mpg since installing it and that is not because of hot rodding it just everyday driving.

I had a Spintex on my 2007 JKU that was a problem and when these came out and hearing the good responses about it. Plus thinking that everything has come along so much I thought I would give it a try, kind of wish I hadn't.

I will come back to this and update it. Either way, good or bad. So it does not become an open post and others can use it in there decision making.

While we know we can recalibrate for tire size, any thoughts on having to set a value for gearing ratios? I know my JK had a setting.

 

[JTPatriot]

While we know we can recalibrate for tire size, any thoughts on having to set a value for gearing ratios? I know my JK had a setting.

The Tazer JL is the only device I know of right now that allows you to adjust tire and gear values. The latest stable version of HPtuners does not allow it, the beta version may, I do not know though.

 

[DAVECS1]

You can adjust tire size and gearing in the HP tuner scanner tool. It will not let you do it in the edit tool. That info must be coming from some sort of BCM. I think the issue I have found is the adjustment for gear and tire corrects the speedo, but it does not rescale the transmission output speeds. I am not sure if what Petty Garage is using is a stock operating system, or if it is modified, and somehow that portion is not correct. I know the base settings between a Rubicon and my truck are exactly the same in the Petty file and it states it is a JK Operating System. With numerically higher gears the Petty tune indicates very low transmission output speeds. This combined with low airflow numbers at low throttle indicates no torque is needed, and the engine generates no power until you clip the output shaft speed minimum limit and then it lights it up, by backshifting and cracking the throttle by 20 percent, and I imagine that is the light switch everyone feels. With stock gears and tires my guess, that is not as prevalent.

 

[Flux]

You can adjust tire size and gearing in the HP tuner scanner tool. It will not let you do it in the edit tool. That info must be coming from some sort of BCM. I think the issue I have found is the adjustment for gear and tire corrects the speedo, but it does not rescale the transmission output speeds. I am not sure if what Petty Garage is using is a stock operating system, or if it is modified, and somehow that portion is not correct. I know the base settings between a Rubicon and my truck are exactly the same in the Petty file and it states it is a JK Operating System. With numerically higher gears the Petty tune indicates very low transmission output speeds. This combined with low airflow numbers at low throttle indicates no torque is needed, and the engine generates no power until you clip the output shaft speed minimum limit and then it lights it up, by backshifting and cracking the throttle by 20 percent, and I imagine that is the light switch everyone feels. With stock gears and tires my guess, that is not as prevalent.

Dave, thank you so much for the effort you are putting into helping all of us find a solution for the drivability issues. I, personally, am quite grateful, and I haven't even ordered an SC yet. With the tools you have, would you be able to make adjustments incorporating changes to gear and tire diameter? The progress you're making is what's leaning me more towards the Magnuson.

Dave Reese

 

[DAVECS1]

Dave,
Currently gear and tire diameter need to be changed using the HP tuner scanner or Tazer variants. The calibration for the supercharger on the other hand will need to be worked on. I believe I am making progress on understanding how the torque model reacts to the different TOS with gears and such. It would be nice if the transmission was scalable with these changes, but it is not, or at least it does not with the OS Petty sends.

 

[Flux]

Dave,
Currently gear and tire diameter need to be changed using the HP tuner scanner or Tazer variants. The calibration for the supercharger on the other hand will need to be worked on. I believe I am making progress on understanding how the torque model reacts to the different TOS with gears and such. It would be nice if the transmission was scalable with these changes, but it is not, or at least it does not with the OS Petty sends.

Good to know. I already have the Tazer and have made appropriate adjustments for my tires and re-gear (37s/5.13). It didn't occur to me that there would be a separate map for the trans that would need to be tweaked. Figured the computer would see the gear/tire changes made by the Tazer and adjust accordingly.

 

[DAVECS1]

That was my assumption also, but the data I am seeing does not reflect that behavior be curious if a stock truck is different.

 

[Flux]

That was my assumption also, but the data I am seeing does not reflect that behavior be curious if a stock truck is different.

Did you try adjusting the ball bearings?

 

[Scratch]

I would like to get some real world feedback like this from owners that have installed the Hamburger unit.
I'm still in the trying to decide stage. First if and then which one.
It also seems like very few of these on the west coast.

 

[DAVECS1]

I thing the biggest issue with all of the options is tuning support. If you have a shop near by that can tune, I would ask their preference. If they have tuned challengers, the ZF8 speed in the gladiator is no different from a tuning perspective.

A centrifugal is going to have less impact on the overall transmission and engine tune modifications as it does not supply MUCH extra airflow in the lower RPMs. This will make it easier for more shops to get driveabilty to something agreeable.

The positive displacement blowers like the Magnuson can supply extra air very early in the RPM range and this has a tendency, to change the behavior of the transmission and throttle feel when do everyday things like cruising through your neighborhood or parking garage. Getting this tuning right is more complicated as it is not easily done on the Dyno and there are many more tables to take into account as this behavior is very transient.

With a centrifugal it shows up when the engine is getting down to business so it is obvious what to tune and when.

With a PD blower, it truly is like having a larger displacement engine but getting it dialed in can be some work.

 

[JTPatriot]

Guess it is time for an update. The individual that is helping me get this dialed in (doing the tuning) has made great strides in getting this setup to have better drivability. With my tire size and gear ratio I believe it has thrown a whole nother factor into the tuning. The light switch acceleration is much much better, still there at times but better. I want to let the computer get used to these settings and see what happens.
We are going to work on one area at a time now. So we still need to take care of the highway cruising issues. Mainly not wanting to go into 8th while cruising and if it does, staying there and not hunting back and forth. At 77 mph it is better, for some reason at 60 it likes to hunt and jump between 6, 7 and 8th gear. Like I said we will work on those as we go.
The last thing will be to try and get some of the fuel mileage back when cruising, seems to have lost 2-3 mpgs when just cruising. I think it has something to do with the tune Pettys supplies, maybe with stock tires and all it may work but when you change tires and gears everything changes with it.
I know I can not thank the gentleman that is helping me enough. He has been quick to respond and has not lost it with me on a few issues I had with inputting tables (at least not in his responses to me )
I will continue to follow up with the progress.

 

[Eric Kern]

Guess it is time for an update. The individual that is helping me get this dialed in (doing the tuning) has made great strides in getting this setup to have better drivability. With my tire size and gear ratio I believe it has thrown a whole nother factor into the tuning. The light switch acceleration is much much better, still there at times but better. I want to let the computer get used to these settings and see what happens.
We are going to work on one area at a time now. So we still need to take care of the highway cruising issues. Mainly not wanting to go into 8th while cruising and if it does, staying there and not hunting back and forth. At 77 mph it is better, for some reason at 60 it likes to hunt and jump between 6, 7 and 8th gear. Like I said we will work on those as we go.
The last thing will be to try and get some of the fuel mileage back when cruising, seems to have lost 2-3 mpgs when just cruising. I think it has something to do with the tune Pettys supplies, maybe with stock tires and all it may work but when you change tires and gears everything changes with it.
I know I can not thank the gentleman that is helping me enough. He has been quick to respond and has not lost it with me on a few issues I had with inputting tables (at least not in his responses to me )
I will continue to follow up with the progress.

Thanks for the updates! And keep them coming, debating between this or the Hamburgers.

 

[JTPatriot]

Another update.
I went ahead and sent Magnuson a email about the issues I was having since install and how unhappy I was with it from the daily driving aspect of it. Dealing with the dead pedal and light switch effect plus the shifting issues at cruising on the interstate.
The lead Tuner at Magnuson sent me an updated file to try. Now I do not believe that Magnuson adjusts anything in the TCM only the PCM, now this is just an assumption on my part as the tunes do not have anything in the transmission area.
I have to say that it drives really well in regards to the pedal issue, in fact it is back to being fun to drive again. Really smooth take offs and nice acceleration from when you slow down to turn and take back off. Have to say I am pretty happy with that part of it now. As far as the cruising and highway shifting. The hunting is pretty much gone now and cruises nice. Still not really happy with the way it handles 8th gear though. Takes a bit to get in to 8th and sometimes feels like it is right on the edge of staying in or coming out into 7th. Plus my cruising mileage is down from 14-17 to 12-14 mpg's.
To me it feels like is a bit sluggish at 77 mph and in 8th, so I am not sure if it just needs some attention in that area which would need either more data logging and looking just at that area or maybe even a dyno to get everything nailed down with the 37's and 4.88 gears.
All in all I am very pleased with the way it is now and do not plan on yanking it off anytime soon as I was when I started with all of this.

 

[KurtP]

Goodness Did they give you any love for doing all their beta testing and trouble shooting for them??

I hate it when companies release a product, charge you THOUSANDS for it, and it isnt even a finished product. You cant tell me that they did any road testing what so ever with issues like you are having.

Hope it keeps getting better for you.....

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