Seca turbo tc03 to tc04 turbine upgrade

I finally got around the time to do the swap after riding her for awhile this season, and collecting the parts needed. I had the turbo modified by an extremely talented guy on the TMIOA forums, he did an excellent job in the machine work. After swapping the turbo's, and installing a size bigger jets and a boost controller, the bike really scoots!! Some new plugs were installed, and I cut off the ground electrode about flush with the outside diameter of the center electrode which gives the plugs a much better spark. I've always had problems with my turbo's spark "blowing out" under pressure no matter what the gap was, and this modification stops the popping/missing that always happened in the upper RPM's. I also had my buddy fabricate and weld a unique BOV piece that attaches to the surge tank so compressor stall is at a minimum. He was also the one who helped make clean welds so the rear disc brake set-up easily went on, and the turn down on the exhaust side of the turbo. After balancing the carbs (with YICS block-off tool) the bike runs most excellent! As soon as the weather cooperates on a friday I'm heading to Norwalk Raceway to see if I can break the 11 second barrier! here are a few pics of the process.

 

I hate to say this, but it sounds like you have "the bug" and you won't be happy until you buy an Australian 891 CC crank, and "middle gear set", a PAIR of 400 pistons, this gets you almost 1000 CC's, then, cobble together a MicroSquirt using SQLguy's posts, add an extended swingarm and GSXR-750 front end because you will HAVE 200 HP on Premium fuel.

You know that bigger Turbo needs to breathe . . .

(and the clutch won't work past 130 HP)

 

I think I may have had this "bug" for a time now, It seems $$ is the only thing holding me back. I hate when people say "why don't you get rid of that 30 year old PITA of a headache bike, and get something newer?" I tell them what's the fun in owning something 20,000 other people own, and my turbo I'd like to think is unique by nature of the modifications done to it...not even considering the low number of turbo's still running on the road (running correctly that is) The guy who did the machine work on my turbo suggested fitting a 750 crank, rods and pistons to the turbo's cases....an idea I've been thinking about because I happen to have all those parts off a 750 laying around (need rings though) fuel injection would be nice though, wish the MS didn't cost so much and take so much time to fab the install. After fitting the R1 front brakes to mine, I actually don't mind my front end now after the progressive springs were installed (about to get race-tech emulators)

 

Hope it stays together for you . Hopefully the crank is in perfect shape. I never knew that was the same crank they used in the 700 air head motor. If you do try the 750 motor thing how are you going to keep compression down? So far Jeffs has stayed together i think he said he was running in the neighborhood of 18 psi boost. I am curious how you make out at the strip keep us posted

 

Yup, mines doing just fine and Ive got my boost controller set right around 17-18psi. I'm Eradicator on the TMIOA forum so you can see more of what I've done there.

I can't view the pics here at the office but I'll look tonight when I get home...big brother at its finest<LOL>.

I'm curious about your BOV setup....if you are using a boost controller what did you do to raise the blowoff point? I simply installed a large flat washer behind the spring. I got lucky because it raised it to around 22psi which is right at the edge of what the engine can handle for extended periods. A guy on the other forum taught me that using a controller was much easier on the turbo then letting the BOV control the boost.

It is a blast and it lets me tell others that I LOVE BEING BLOWN without sounding like I saying something nasty!!

Make sure you post your Norwalk results....I'd be very curious. Be careful of what TTR tells you, he tried to get me killed too<LOL>!!

Just teasing....besides, if I want to do 1/4's fast, I have a heavily modded H2 triple for that. A very modified H2 is 36 years old and still hold the record for a naturally aspirated 750...not too shabby

jeff

 

Hey Jeff, I'm mrxj650 over at tmioa....as for the function of the BOV, it has nothing to do with controlling boost....it's only function is to release the boost spike that happens when the throttle plates close under pressure, the surge tank valve does this also but at a much higher psi...I've also shimmed the valve with a washer. I have the BOV set around 7-8 psi, so when there is positive pressure it holds the BOV closed...as soon as positive pressure turns to vacuum, the boost spike created by the quick closing of the throttle can escape through it without causing possible compressor stall between hard shifts. The weather here in Ohio might cooperate Friday and I'm rather excited about going to the drags, cause every time the other bikers there say "what the hell kinda bike is that?" "Is that thing really turbocharged?" I love it

 

Rock on and keep the rubber tight with the asphalt when you go to the track!!

I read your postings on the other forum...and I'm guessing that either Grumpy or Positive Pressure did your mods. I'm going to do a bit of reading about the 04 turbine to see if it would be worth it to me. I'm getting super boost so for me, there might not be any real sense in modding it. I'm still trying to get a past insurance issue with the MVA resolved so I can ride up to the turbo rally in July....are you planning on going?

jeff

 

Your right about the mods...I sent Grumpy a stripped turbo (no exhaust housing, no wastegate) and he did the machine work on the compressor housing and put the bigger wheel in...then sent it for balance and sent it back to me. The front R1 brackets were made by Positive Pressure, and after tracking down all the R1 brake equipment I had what I think is the most important upgrade I have made yet. I've thought about the turbo rally, but 8-9 hours on I-80 with no riding buddies sounds like a looong ride so probably not....but it sure sounds fun though to mingle with all the other turbo owners. I am going to the AMA vintage days at the Mid-Ohio race course the weekend of July 23, It's the biggest vintage swap meet in the country and there's ton's of people, vintage bikes and racing. Of course it's probably 5-6 hours of travel for you, only an hour for me. It's going to be sunny and 80 tomorrow here in NW Ohio so I'm going to the drags for sure, I'll be sure to post the results!

 

I got one run in before it started raining, but that's all I needed. I guess that's why they call it Friday test n tune, because I tested it and it needs tuned! After I hit third gear it was pulling hard, and the clutch started slipping....I backed off till she caught again and finished the run with a 12.3. I'm aiming for low 11's possibly high 10's if I can get a good launch. My back tire is on it's last season, so the balding strip in the middle is good for heating it up in the smoke box...grip was very good. The clutch is adjusted to as good as it gets, I replaced it about 6k miles ago with Versah friction discs and EBC HD springs...thought about shimming the springs but i'm thinking about taking everything out for inspection and possible replacement. Maybe I have hit that HP threshhold like Time said and the clutch just can't take it, I hope not!! Also I replaced one of the float bowls with a spare to stop a leak, which it did....but I forgot to clean and check the enrichment tube because all of a sudden it doesn't want to idle smoothly when cold, so looks like the carbs are coming back off again! I'll keep the updates coming when I can make it back to the track.

 

From my point of view, if you pulled a 12.3, that's very respectable. I think that was very close to what the factory had claimed for the bike back in the day.

From my personal experience, if the "factory said 12.2" then the best that I would have seen from ANYONE would have been low 13's...LOL. When the 69 H1 came out, the times advertized were 12.2.....throughout my entire life, I never saw anyone with my own eyes, break into the 12's on a stock H1. I heard thousands of stories over the years but NEVER witnessed anyone do 12's on a stocker. Same with other bikes....if the factory said 11.5.......I never saw anyone put one into the 11's. Just one of those things.............so don't feel bad about 12.3, not at all!


Slipping clutch or not, the bike is a pig so getting it off the line in a hurry just isn't going to happen, combine that with the fact of not getting any real boost until 1/3 of the way down the track.....12.3 is very good.

Unfortunately, if you do exceed one component and it fails, you'll repair it and the next component will take a dive. It's the rule of HP<LOL>.

For my modded H2 triple, I use carbon fibre's and steels....got the complete custom kit from John Lutz at Mid-Atlantic. The kit came with springs but I do fine with 3 HD springs and the rest stock....nice easy pull and the clutch holds up to the power....but I also do not drag race it.

I don't know if you'll get into the 10's with your turbo but it sounds like you're having a blast with it.

Thanks for posting your results!!

jeff