Power commander or screamin eagle tuner

[Simon]

Something to consider is how often you will be changing bits on your bike. If you are only going to make a few changes and then leave it, all well and good. However, if you are going to be making regular changes them there are better alternatives.

I'm about to ditch the SEPRT and stock ECU on my XR1200 for a Thundermax auto-tune system. One a base map is loaded with a target AFR it will constantly readjust the settings to suit. Periodically you can reset the base map. You can also get the bike dyne tuned to get it spot on but the system has the advantage of doing most of the work for you.

[Foxster]

Originally Posted by simonDyna

Something to consider is how often you will be changing bits on your bike. If you are only going to make a few changes and then leave it, all well and good. However, if you are going to be making regular changes them there are better alternatives.

I'm about to ditch the SEPRT and stock ECU on my XR1200 for a Thundermax auto-tune system. One a base map is loaded with a target AFR it will constantly readjust the settings to suit. Periodically you can reset the base map. You can also get the bike dyne tuned to get it spot on but the system has the advantage of doing most of the work for you.

Umm, I might kinda see the point of the Thundermax for starting from scratch but I really don't see you are going to get much from it as a replacement. Though from a "its mid-winter and I want to spend some money on something to play with" point of view I'm right there with you.

With the SEPST you put on a canned map and then use Autotune (if you have the software and leads) to get a pretty good tune. You can also get it dyno-tuned and get it even better.

With the Thundermax you do the same. Its just a bit better at keeping the target AFR, but that's just a target AFR, its not what is the best power, you need a dyno to measure that.

I doubt you'd really get a better tune from either.

[Simon]

Originally Posted by Foxster

Umm, I might kinda see the point of the Thundermax for starting from scratch but I really don't see you are going to get much from it as a replacement. Though from a "its mid-winter and I want to spend some money on something to play with" point of view I'm right there with you.

With the SEPST you put on a canned map and then use Autotune (if you have the software and leads) to get a pretty good tune. You can also get it dyno-tuned and get it even better.

With the Thundermax you do the same. Its just a bit better at keeping the target AFR, but that's just a target AFR, its not what is the best power, you need a dyno to measure that.

I doubt you'd really get a better tune from either.

Then we agree to differ on some elements and agree to agree on others.

The bike came with the SEPRT fitted presumably because it was an ex-demo bike for Cheltenham HD. It wasn't what I would have chosen but I've run it for six months to give it a fair go. I've got the leads and software for the SEPRT and have had a decent play with it. I've decided its not for me. I've had a look at the Thundermax and prefer the flexibility it provides me.

Harley don't provide any performance parts for the XR so everything is after market. The Thundermax is more suited to that direction in my mind. The SEPRT is a good system but doesn't really allow parts changes without going back into the system whereas the Thundermax does.

As for peak power/torque, as you state, none of the systems will get that without a proper dyno tune but the Thundermax will place you nearer more consistently. I also like the fact it will compensate for different octane rated fuel on the fly.

I've got three choices of cams lined up, starting with the little ones (575's) and working up. It should be interesting to see how much or little actually needs to be done when setting them up.

[Foxster]

Originally Posted by simonDyna

Then we agree to differ on some elements and agree to agree on others.

The bike came with the SEPRT fitted presumably because it was an ex-demo bike for Cheltenham HD. It wasn't what I would have chosen but I've run it for six months to give it a fair go. I've got the leads and software for the SEPRT and have had a decent play with it. I've decided its not for me. I've had a look at the Thundermax and prefer the flexibility it provides me.

Harley don't provide any performance parts for the XR so everything is after market. The Thundermax is more suited to that direction in my mind. The SEPRT is a good system but doesn't really allow parts changes without going back into the system whereas the Thundermax does.

As for peak power/torque, as you state, none of the systems will get that without a proper dyno tune but the Thundermax will place you nearer more consistently. I also like the fact it will compensate for different octane rated fuel on the fly.

I've got three choices of cams lined up, starting with the little ones (575's) and working up. It should be interesting to see how much or little actually needs to be done when setting them up.

Sounds like a plan. Post how it turns out cos I'm definitely interested.

[Simon]

Originally Posted by Foxster

Sounds like a plan. Post how it turns out cos I'm definitely interested.

Will do. I'm interested in how far it will go. Are you going to be at Talgarth?

For the original poster, if you are starting from scratch (and certainly looking at aftermarket parts) the Thundermax with Auto Tune is a viable alternative.

[Julesx]

I have read this thread with interest as I want to Stage 1 my 2010 Street Bob.

Foxster has kindly offered his advice in the past () and I am now ready to do my bike. As with most things cost is a consideration!

I have just found a ball park figure of £690 for the Thundermax auto tune. I need someone to fit it and I assume tune it - Any ideas of tuning costs and who to do the work?

Alternatively I think I would be happy with a SEPST tune but have no idea how much HD charge for loading the map and then tuning the bike.
I'm thinking that the SEPST might be cheaper!?

Foxster, anyone give me a price?

Thanks

Jules

[Bute Bagger]

The Thundermax is easy to fit , about an hour for your average home mechanic , download your map from the T max website , plug in your laptop to the bike with the cable provided, transfer the map , fire up the bike and watch the bike set its idle setting on real time gauges on your laptop it will tell you when it's finished shut the bike down disconnect and ride , the autotune will do the rest , no requirement for dyno time and added expense , come to the Bute rally and I will fit it and tune it over the weekend for the price of a pint

[heliharley]

Sorry just jumpin back into this thread as I got a SE race fueler instead (part of a bulk order from overseas and was cheap as chips)are these any good?

[Yeti]

If of any use, we have taken off many V&H FuelPaks and some SE Tuners replacing with Thundermax's, PC III's and PCV - some due to our recommendation, but in the main due to punters choice and pleased they came to The Hogfather Motorcycles as we are approved installers / tuners for these two in our opinion better tuning aids. We fit loads of PC III's and PC V's (circa. 20 already this year), on the ThunderMax with AutoTune, a punter brought us his CVO 110Cui Electra Glide Ultra from down south, with a "simple" objective, he wanted it tuned to hit 110 BHP on our Dyno. Yes we did other things, which pumped up the overall cost, but the owner had it in his head that's what he wanted, so that's what he got without performing any major mechaincal internals - a side issue I know, but hey, thought I'd throw it in for good measure. Regardless, as someone once said opinions are like arse holes everyone's got one, so whatever you coose, hope it works for you. Take care all and see you at the Lakes gig in July.