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  #91  
Old 3rd July 2023
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Sportster/Buell Model: Sportster 1200
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EXCITING NEWS!

I was under the impression this whole time that Garrett no longer made the GT15 as it isn't listed on their website. Turns out, they do in fact still manufacture it, and there's multiple different websites that you can purchase it from. I'm able to source these turbo's brand new for $600! So stoked about this. More than likely I'm going to have 2 different options for the turbo; you can either go with a Genuine Garrett core, or you can go with an eBay core.

Either way, the turbo's will be converted to carbon seal, and then be machined to accept a billet wheel, and then re-balanced. So regardless of which route you go, you'll have a Billet Wheel turbo that can support 150+rwhp on higher boost. These turbo's have 360 degree thrust bearings and will be balanced to specs exceeding the industry standard.

Speaking of HP, the last thing we need to answer before coming to market is how much power this makes, so my sportster will be going on the dyno to get some numbers. Not to caveat this to death, which I feel people often do with dyno numbers; It's been 111* during the day here in Arizona, the air is nasty. I don't even have 20* of timing in the bike right now, and the AFR's dip into the 10's and then settle in the mid 11's at WOT. So keep that in mind when I post the dyno sheet.

We're back on track to release the kit before summer is over.

Cheers!
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  #92  
Old 22nd July 2023
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Quick Update; Switched to a 3" downpipe on the Sportster and I'm pleased to say it cured a couple of issues that in my mind were unrelated. Additionally, I'm going to make one final tweak to the plenum that I think will pick up an additional 5HP or so before finally going to the dyno to get some numbers. Shooting for Late August/Early September timeframe at this time. It's getting the last 10% out of the setup that's going to separate this kit from the inevitable copy-cat kits that I know are going to hit the market eventually.

The development of this turbo kit represents 18 months of my life that I dedicated to making the best draw-thru turbo setup I possibly could for the Harley Sportster. 6 (or was it 7?) revisions of the first turbo setup, a complete clean sheet re-design, and an additional 3 more revisions to end up with the final design. So many obstacles, so many hours in the garage spilling gas on my hands, pulling my hair out chasing driveabilty and response, 100's of instrumented WOT pulls, over 10,000 street miles, all to FINALLY end up at a point where I can honestly say; there's really not much more I can do to improve this kit.

See you soon!

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  #93  
Old 22nd July 2023
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She looks mean!
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  #94  
Old 22nd July 2023
84rzv500r 84rzv500r is offline
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yes been following this! the packaging has improved greatly... no more intrusive than he stock exhaust or the 38 flat slides and K&N's on my XR...
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  #95  
Old 23rd July 2023
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Quote:
Originally Posted by ChinCactus View Post
She looks mean!
Thanks!

Quote:
Originally Posted by 84rzv500r View Post
yes been following this! the packaging has improved greatly... no more intrusive than he stock exhaust or the 38 flat slides and K&N's on my XR...
Thanks, yeah it's come a long way. You can touch your knee's to the tank and not hit anything on both sides. Other than the carb taking up a little room you barely notice it's on there.

I actually just acquired an Ironhead, once I bang out my KZ650 Turbo build and also the Twin Turbo EFI GS400 Dune Bike (lofty project; 100HP, 400CC, Long Travel/paddle tire Mad Max dune machine), I'm building that bike, and turbo kit testing will begin for Ironhead Sportsters.

Should have a kit for the Ironheads out around this time (possibly earlier) next year. Then it will finally be time to tackle the FI sportster's.
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  #96  
Old 3 Weeks Ago
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Quickshifter works! I'm not going to call it a "quickshifter", I think a WOT Shifter or drag shifter would be more appropriate. I'm using a rear brake light switch to close the circuit on the ECU. The blackbox ECU's that will be coming with my turbo kit have a specific quickshift function that allow me to adjust the killtime. Spent a lot of time on this, playing around with different kill times and finally settled on something that works consistently.


This is going to be an option for those of you who have more drag oriented bikes, and because of the way it operates, my recommendation would be to use it only for higher throttle positions and above 3,500RPM or so. You really need more killtime down low and less up higher, and same goes for being in higher gears. So you have to compromise a bit with the killtime and optimize it for a certain RPM range. The way I will be sending it to the customer, it will be optimized for Wide-Open, Full throttle shifts at High RPM. I've been consistently banging the gears (including the 1-2 shift), Full throttle, no clutch staying at full boost and just clicking off gears, it's really fun. Beats the hell out of chopping the throttle!


As far as the rest of the kit, I feel comfortable saying the GT15 Kit is ready for production. The order books will be open on my website (www.doctor-motorcycle.com) as soon as I get my turbo's back from the shop that does the carbon seal conversions. They typically have a 2-3 week lead time, so we're very close! I'm going to be building these turbo kits in runs of 3, to prevent myself from being too overwhelmed in the beginning, and they will be sold in a first come, first serve manner. I have a shortlist of people that are interested; if you'd like to be added to the shortlist to be e-mailed 24 hours before the kits are live on the website, please send me a message.

Also, I will be making a separate big turbo kit for those of you that have cams/headwork that want a lower backpressure, more power focused turbo setup that will work with cams that have 40* or more of overlap. One of the last things I need to do (that I've been putting off forever, lol) is weld a bung onto the exhaust manifold of the Current GT15 turbo setup and run some bundy tubing from it to a boost gauge, and compare the backpressure to boost ratio. I suspect that on low boost (12psi and less), even the GT15 will work just fine with aftermarket cams, but I need to verify first before going out on a limb and saying that.

Methanol injection setup is in the works too, just need to move a few kits first.

See you soon folks!

Last edited by DrMotorcycle; 3 Weeks Ago at 04:37..
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  #97  
Old 3 Weeks Ago
Tomcatt Tomcatt is offline
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Quote:
Originally Posted by DrMotorcycle View Post
... I'm going to make one final tweak to the plenum that I think will pick up an additional 5HP or so before finally going to the dyno to get some numbers...
Results???
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  #98  
Old 3 Weeks Ago
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Quote:
Originally Posted by Tomcatt View Post
Results???
Haven't gone to the dyno yet, will post numbers when I have them. Everytime I call the shop the dyno is taken, they only do pulls from 7-9am, after that it's too hot.
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