Dr.n2o
Well-Known Member
Nice craftsmanship "my friend"....good luck with everything
Turbocharge your VMAX?
- Thread starter TURBOVMAX
- Start date
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TURBOVMAX
Well-Known Member
Right... some updates
Jeff's HSR 42 mm Mikuni in place
Silicon connectors with worm drive clamps. Left a set of clamps off so you can see the connection... 3/4 of inch of engagement for hose and the clamps are 3/4 wide. (will not leak) The hex head screws will be replaced with stainless socket head cap screws when I pretty it up.
This new turbo is a tight fit! Still more clearance needed laterally for the Mikuni.
More later...
Jeff's HSR 42 mm Mikuni in place
Silicon connectors with worm drive clamps. Left a set of clamps off so you can see the connection... 3/4 of inch of engagement for hose and the clamps are 3/4 wide. (will not leak) The hex head screws will be replaced with stainless socket head cap screws when I pretty it up.
This new turbo is a tight fit! Still more clearance needed laterally for the Mikuni.
More later...
dodgediesel59
Well-Known Member
Well, Just bit the bullet and ordered a turbo, stainless exhaust parts to build a custom system for it and some gauges. My question is what about the carb? I see you are planning on running the HSR42, from the calculations my friend did he says thats not going to flow very well and provide the fuel needed. I am no expert in this field nor do I claim him to be, but just looking for a little input before I start looking. Also, what is required to convert an HSR to work with a turbo?
TURBOVMAX
Well-Known Member
There's no problem using an HSR 42 with fuel or flow. My old draw-thru turbo bike ran 8.70's at 162+ MPH in the 1/4. Sean Morley can hook you up with a Mikuni setup for the turbo. Just curious... how did your friend calculate the flow and fuel? Lots of people that used an S&S carb on their draw-thru setups are now using the Mikuni.
KJShover
Proud Vmax lover
TURBOVMAX
Well-Known Member
Much appreciated KJ!
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dodgediesel59
Well-Known Member
Not too sure how he was figuring that out gary. So I have been talking to Jeff a bit about his old setup and was curious about building an intake. I am thinking about fabbing up an aluminum box of sorts that has a machined lid on it that bolts on. It will be contoured to the intake ports on the head and when the lid is removed you can bolt it to the head then install the lid. If this makes sense to you do you think it would work or do you need an actual tube between the intake and head?
TURBOVMAX
Well-Known Member
Can you tell me a little about the turbo and waste gate you purchased?
You can get get that kind of a plenum setup to work but the best setup would be having a runners (tubes) connected to the head intakes. The longer the better for low end torque... 3500-5000 RPM. So that leaves very little option given the space we're given to work with. Look at the setup I'm working on now... I'll show some pics of the inside in a couple of days. Some of things that were accomplished:
The plenum is not hard mounted to the front and rear cylinder banks... allowing for thermal expansion front to back.
Long tubular runner to the intake... high velocity
Short distance from the carb to the head intake port.
The most important thing to try and accomplish is to keep the fuel droplets or atomized fuel in suspension and get it there in a hurry. (Mikuni excels at this) Otherwise you get what's called puddling in the plenum... which is basically just raw fuel sitting there waiting to mess with you.
So if you were to build a one off setup you could take a large tube and weld the intake runners into the large tube using the engine as a jig.
dodgediesel59
Well-Known Member
I scored a Garrett TR0579 which is basically a T25 for 80 bucks shipped. It is of an older eclipse with low miles. I know its not probably ideal, but I am trying to do a nice but lower budget build as I am not planning on pushing everything to the limit. I figured a garrett of any model was probably going to be a better turbo to have instead of a cheap chinese one! I was also thinking today about doing an all tube intake that came to a center flange I could couple to turbo output. But I dont think I could make that work because the turbo would be way to the left of the bike and interfere. I suppose I could bring them up to a central location though and make a pipe to go from that flange to turbo output. Thanks for the inputs Gary, I am new to the gas turbo world, but have spent alot of timing in the diesel world playing around. All it takes is small suggestions to start big ideas! Once I get things underway with the build I will try to take pictures along the way so everybody can tell me what I am doing wrong!
TURBOVMAX
Well-Known Member
Your very welcome! I do have a bit of bad news though. To run a draw-thru gas setup your going to want to rebuild that turbo using a carbon face seal between the compressor and turbine housings. There are some kits available to do that... but I'm not sure if there's one available for the Garret model you've scored.
Here's a good explain link for you to check out... Carbon Seal
Here's a good explain link for you to check out... Carbon Seal
one2dmax
Well-Known Member
If you can sell it I can sell you a good turbo identical to what we are using with the Kits being made.
Sean
Sean
dodgediesel59
Well-Known Member
From what I can find on it its a T25 base which appears like it most likely has a carbon seal but parts sound available to convert it if not.
on a side note i completely agree!
TURBOVMAX
Well-Known Member
Very cool! It will make boost! Have known a couple of people who have ignored the carbon seal rule for drag racing and the bike ran fine... just blew a lot of smoke out of the exhaust once in a while. Looking forward to seeing your project develop.
What's your first name?
wildweasel_pt
Well-Known Member
Thumbs up Gary!...
dodgediesel59
Well-Known Member
Hey Gary, my name is Robert. I have talked a bit with Jeff o n the subject as his drag build inspired me to finally bite the bullet on this project. I am really hoping to have the Carb and Turbo next week so I Can get started on this and hopefully have this done for the spring. I think building the intake and exhaust are going to be the hardest parts to accomplish. Is the factory fuel pump going to be aduate for use with the hsr? Anything else special I need to do with this setup that yall think I am f orgetting? I bought dingys old programmable tci box and it has a spot for using a map sensor to use for the timing curve. So i am hoping i can get that working right and actually have a nice retarded timing curve. Jey sean , what are u thinking for a price for a turbo? I would love to up grade but i dont think its in the budhet right now. thanks. For all the input guys I am posting from my phone so sorry if things are hard to understand or misspelled!
06VMAXIMUS
Well-Known Member
Good reading, glad to see this project moving forward again! Best of luck guys!
TURBOVMAX
Well-Known Member
Robert the factory fuel pump is fine. I'm real interested in that TCI box.
TURBOVMAX
Well-Known Member
Some good reading for you turbo heads... GM Turbocharging Components
dodgediesel59
Well-Known Member
Well I need to get a serial to usb adapter so I can play with it a bit, but I would like to try and get a progressive spark curve set up and see what differences it will make. I will have a one up in that department over the Dyna boxes.
