I know I know I said I wasn't going this route, but I cracked the code. Honda gave us the option to have a long lasting 300k+ Mile vtwin or one built for performance. And I have research today. Early 2000's, Honda had 2 Performance V twin Bikes, the vtx 1800 and the "Duc killer" rc51. I've studied these engines extensively and have realized the 1800 has borrowed many characteristics from the rc51. The only things being different are the following: Vtwin degree angle, rc51 has 4 injectors 2 plugs, vtx has 2 injectors 4 plugs (they both use 50psi denso injectors), cid (obviously) dohc, and stroke, everything design wise is pretty similar except for the rc51s 10.5 LITER AIRBOX lol it's made me realize that the vtx is literally choking to death. I'll contribute a photo that I have to compare valve sizes and other numerals. I will admit these engines use the same pistons which is amusing considering ones 996cc and the others 1759cc
As you can see increasing the valves/intake/throttle body/ manifolds 39% bigger to match the rc51s cfm rate and exhaust vacuum looks ridiculous, Either way as shown the 1800 is 78% larger than the rc51 but the 1800 pulls in 39% less air than the rc51.. so no amount of head work, big bore kit, etc will amount to fixing this unless you want to spend several thousand dollars trying to get anywhere close to the rc51s 133whp. A smaller AR turbo with an inter cooler seems like the only real hp solution.
So I'm reaching out to anyone who has a turbocharger setup. I need numbers and info please >
You may want to send a PM to "monty26" and look at his posts/threads.
He also has posts/threads on vtxcafedotcom
It appears has a turbo 1800 and a supercharged 1800.
1800 TTS supercharger running around $5-6k, looks like some still active trying to get max performance. http://www.vtxoa.com/forums/6-vtx-1800-tech-board/318064-supercharging-vtx1800-37.html
Personally I think the supercharger is going to be the easier route to go. Being mechanical, there's no real custom plumbing to worry about. With a turbo, especially with an intercooler, you will need to worry about exhaust plumbing, intercooler location and plumbing to that and then back to the intake. Of course nothing is impossible, but given the ability to just bolt everything up and really the only work after that is fuel and ignition timing (those will be issues with a turbo as well), seems like a reasonable shortcut. And then there's the sex appeal of a blower.
definent sex appeal. But I don't have any experience with superchargers. I've helped a turbo build on a Sentra and a civic, relatively familiar with turbo forced induction, hoping to save a few bucks using that knowledge and buying parts separate instead of spending $4000 to have someone put "their" product on for me
Dang!! I was considering a rear set turbo system but wasn't for sure how it would look/ accommodate for passenger space/ etc, the model I'm looking at is produced by a company south of Chicago, it looks like they use the standard 11" runners, maybe an .87 k03 and some sub-sized side mount intercooler, I'll have to find the photo again.
It looks like whether you supercharge or turbo, any forced induction over 7psi will require the fuel injector upgrade, which are Subaru injectors from what I have read... anybody have a part number? Will I need an upgraded pump as well? I only want 10 psi
Did I read somewhere also that the final drive can only support 150whp..? How are some of these 1800's running 200hp+??
I enhanced it but it was stotz racing that had the best set up I could find. Running the intake in between the exhaust pipe and the engine did surprise me though, would they have separated the exhaust from the engine block to avoid a hot spot?
I've got the kury charger and I can't even get the plates to move lol why the previous owner wasted $230 on that trash still leaves me scratching my head
I can definitely help you out. Here are some things that I suggest getting.
PC V
3 bar map sensor to hook up the the PC V aux input
Injectors - Subaru Pink, you can find the part number by just searching that
Adjustable FMU - There are a couple types (vortech, RCC, etc).
Fuel Pump - Bosch 044
I suggest going up to 15psi. You can do that on pump gas. You can easily get by with a GT2252 to a GT2560R turbo. I have a GTX2860R but I also go up to 30psi.
The final drive can handle any power you throw at it. The transmission is the weak point of the VTX. I have gone through 2 transmissions and the trans currently in the turbo bike is starting to have problems. Once you get up near 200HP, they just start having issues when you are flying through gears.
Yeah Rivet, when are we making it to the Grove this year?
Jakksin, what IAT did it calculate with? With an intercooler, you may be above 200HP at 15psi, but without the intercooler your IAT is close to 200 degrees and would be around 175HP, maybe a bit under.
Well according to the calculator the iat runs from 75F to 98F... that seems kinda low for an air to air intercooler set up. What should I set the temp to?
I plan on using an intercooler for sure, detonation scares the hell outta me. I keep thinking about that video of the pro stock hayabusa where the guy lost his left hand after the piston came flying out from under the gas tank, honestly I don't see how you can run 30psi and keep calm and collected, you must have nerves of steel man
If you are going to run an intercooler, just get a 7 psi wastegate spring and a manual boost controller and run what you are comfortable with. I'm definitely running pump gas up to 15psi, so you should be safe up to there. It is definitely fun up there. It's probably better to start with the 7psi anyways. 200hp is a handful to control in 2nd and 3rd gear, but a lot of fun in 5th gear. Doing 80 on the highway you can just turn your wrist and instantly be doing 120 and be pulling harder as the mph goes up. You will definitely want to get a code for the rev extend and change your rpm limit to 7k.
Went to the drag strip this Saturday and ran a 10.66 @ 127 with a 1.58 60 foot on 15psi. Unfortunately I was only able to do 1 pass due to a bad accident that closed the track for the rest of the day. The turbo monster is alive and well.
I know I know I said I wasn't going this route, but I cracked the code. Honda gave us the option to have a long lasting 300k+ Mile vtwin or one built for performance. And I have research today. Early 2000's, Honda had 2 Performance V twin Bikes, the vtx 1800 and the "Duc killer" rc51. I've studied these engines extensively and have realized the 1800 has borrowed many characteristics from the rc51. The only things being different are the following: Vtwin degree angle, rc51 has 4 injectors 2 plugs, vtx has 2 injectors 4 plugs (they both use 50psi denso injectors), cid (obviously) dohc, and stroke, everything design wise is pretty similar except for the rc51s 10.5 LITER AIRBOX lol it's made me realize that the vtx is literally choking to death. I'll contribute a photo that I have to compare valve sizes and other numerals. I will admit these engines use the same pistons which is amusing considering ones 996cc and the others 1759cc
As you can see increasing the valves/intake/throttle body/ manifolds 39% bigger to match the rc51s cfm rate and exhaust vacuum looks ridiculous, Either way as shown the 1800 is 78% larger than the rc51 but the 1800 pulls in 39% less air than the rc51.. so no amount of head work, big bore kit, etc will amount to fixing this unless you want to spend several thousand dollars trying to get anywhere close to the rc51s 133whp. A smaller AR turbo with an inter cooler seems like the only real hp solution.
So I'm reaching out to anyone who has a turbocharger setup. I need numbers and info please >
Did the VTX1800 Turbo thing 2007 with great success. The kit was built by myself and I ended up with finally using a Mitsubishi TD04 charger with intercooler. The bike was benched to 163Hp and incredible 260Nm in torque with 0-100km/h in 3,2s and 0-200km/h in 11,2s. I sold the bike for a bunch load of money in 2010 ( $15000 ) but I have missed it every day since so for a week ago I bought another VTX1800 which now shall have the same conversion.
the motorcycle in run vtx 1800 from 2003, the motorcycle starts well and drives and just when the turbo is going to start blowing the motorcycle brakes and then propels and the force is felt. the weekend I did a test I opened the actuator of the turbo to lower the turbo pressure a little and it worked much better, you know if for this modification to work well I must change the factory map sensor. thanks for your answer.
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