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monster turbo3 build
Topic Started: Jun 17 2011, 05:53 AM (36,548 Views)
t3ragtop
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Turbo3 and Twincam Tweaker

here's a pic of the hard instrumentation. the megasquirt also gives me 8 virtual gauges that display on the netbook's screen.
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Alpine
1020cc G10 GOML

if you ever plan selling this

i want it <3
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Geo Jeff
everything geo
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This is just the best read i have done on a Geo ever. I'm looking for some turbo info for a couple hovercraft I am building and came across this and I thought I was Geo crazy. That is slicker than dear guts on a pump handle. Kudo's to you and your wallet, its not enough to dream it but to live it is life itself. To look that vette right in the eye and give him the big number one and crush him. LOL love this post

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Geo Jeff
everything geo
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So I have done many turbo set ups on my hovercraft but always used www.lowbugget.com blow through set ups no matter what the motor was. Thye work great and he has asuper set up but I am building a very small set of hovercraft right now that would be in the 30 hp range and kinda lame. so I am upgrading to the 3 cylinder and want to do a blow through on the stock TBI and ecm. When I do the carb blow through we add 1 lb of fuel pressure per lb of boost. The carb setting on top of the turbo works as if its on a normally aspirated engine except the fuel pressure increase for the most part.
I read at swift a stock TBI will do up to 8 psi of boost and this is limited to the stock fuel pump which it said was about dead headed for this. Yes i know about running fuel over the turbo blades and i'm not worried about it. What I am looking for is can any one tell me if they see a issue with the stock ecm running the TBI on top of the turbo blowing through it. If it works as well as a carb its the easiest cheapest turbo system you can ever install. Can some one recommend a good rising rate fuel pressure regulator.

I'm thinking to keep it cheap and simple a EGT gauge and air/fuel ratio gauge and a better fuel pump than stock with a good adjustable rising rate fuel regulator.

I'm wondering if we need a pop off valve on a propeller driven engine as well. I guess it cant hurt.

The cruise rpm should be in the 3200 rpm range and fast or heavy running about 4200rpm and take off full power for as much as 20 seconds but most cruising is down in the 30/40hp range for hours at a time on a friction throttle lock.

I have the turbos and motors already and didn't spend much time sizing them. I have a couple buckets I keep some different size turbos in for these projects and I have two Audi 1990 5 cylinder turbos that are the same. One for each craft. As long as they spool up at full power I'm good and they should work just fine.

So if any one see anything here i am missing doing a TBI i would appreciate the tip. I'll post some links up of the build videos to my you tube account and to here for any one that would like to follow along.
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Mikemetro
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Looking good T3. I sourced up all the internals for my build (had to get my rods from singapore). Was just about to order my MS controlls and wideban setup but had to drop 3 gs to take my ex wife back to court. Well the MS is on hold for now. Maybe. But keep it up. I will definitely be referring to your thread when I get back on it.
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starscream5000
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Got 70 MPG?

t3ragtop
Jul 6 2011, 08:03 PM
here's a pic of the hard instrumentation. the megasquirt also gives me 8 virtual gauges that display on the netbook's screen.
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And here I thought I had the most gauges on this forum, :lol
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bogs
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Duct tape heals all wounds

I think that is the most awesome array of gauges I have ever seen outside of aircraft cockpits :thumb
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Coche Blanco
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Troll Certified

I thought this was supposed to be sleeper... ;)
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t3ragtop
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Turbo3 and Twincam Tweaker

when i only had the vacuum/ boost and narrow band afr in the pillar pod, one of the guys who works out of the same building i do asked me what the blinking red numbers were for. the cyberdyne digital boost gauge displays solid numbers for negative pressure and flashing numbers for positive pressure.

cb, let's call it "sleeper-ish." ;)

my new gauge set has instruments that scroll "low" and "high" below and above the preset values and stores the actual low and high values in a memory that can be re-played by pressing a button on the pod. this new vacuum/ boost gauge also has a little piezo alarm that warns you if you pass the high value. i popped that onto the back of the vdo gauge pod along with the memory button.

i will add 2 more cyberdyne digital gauges later, one that displays the charge air temperature on the inlet side of the a2w i/c and another that displays the i/c heat exchanger coolant temperature. the i/c outlet air temp is the same as iat which is a tier one engine control sensor for the megasquirt and can be displayed as a virtual gauge on the netbook's screen. if i have intercooler inlet and outlet air temps and the i/c coolant temp i can work the delta temp calculations and track my i/c efficiency based on ambient air temperature.

i also have an ultra bright led that illuminates when the knock sensor detects pre-det/ pre-ignition. it's a visual warning, the knocksensems and ms2extra actively adjust timing to protect the engine. i still have to mount the knock detection led somewhere on the instrument panel.

on the blow-through turbo project, i've read threads by some guys who have done those. i don't have any direct experience with those setups so i will reserve commenting other than to make the observation that providing proper fueling seems to be elusive as boost pressures rise seems to be a recurrent problem.

a blow-through turbo rig on a propellor powered machine is easier to build as the engineering is designed to hold a steadier throttle input and operate at an rpm that puts you on your fan curve. the throttle response issues and rpm range is considerably different from a car. you could use a 1:1 rising rate fuel pressure regulator for that and there are any number of inexpensive options out there. you are correct about the fuel pump pressure but your 3200 to 4200 rpm spec should make it pretty simple to run the throttle body injection with the map controlled ecu while making your hp number. you'd probably be well within the torque range for a prop job, maybe a little low on rpms for max hp from the engine.

the weekend is here and i'll be doing the megasquirt control wiring and some welding on the front exhaust to add a flex pipe and a forward exhaust hanger under the steering rack. i'll also get the netbook computer mount located. i may not use the mount for the passenger seat bolt as i have been considering moving the mounting location forward and onto the floor pan tunnel to maintain some room for a passenger.



Edited by t3ragtop, Jul 8 2011, 04:38 PM.
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rlkramel
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Did a video of this baby materialize? Did I miss it somewhere?
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t3ragtop
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Turbo3 and Twincam Tweaker

i'm not really a video kind of guy. i'm doing good to get still pics posted. :P

i might get some video up when i get to the point of starting the engine towards the end of the month. until then i have a bunch of wiring to finish, more fabrication on the exhaust, and interior work.

the important thing is that i have my motivation at a pretty high level and i'm chipping away at the work every day. right now, it's down to a money thing. i have another couple of fistfuls of cash to throw at the car and until i sell some parts i can't order the materials i need to finish the project.
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t3ragtop
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Turbo3 and Twincam Tweaker

i tried to get an early start today to beat the heat. darn, it's hot out there! :x

i finished up the front exhaust pipe, adding the flex joint and hanger, cleaning up the welds, and painting the weldments with high zinc epoxy to make things "pretty." i also welded the hangers on my big fart cannon and got it in place so that when my next load of parts gets here i can finish running the 2.5" rear pipe from the intermediate pipe to the muffler.
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i got some other little things done to clean up like new stainless hardware for the lower tie bar, a waterproof micro fiber sock on the air filter to keep water from being inducted into the turbo, more surface rust remediation and seam sealing at the back of the car on the bottom before i hung the muffler, etc.

after the heat of the day subsides and the sun gets a little lower, i'll get back out to work on the megasquirt wiring making those tedious point to point solder joints. i'll concentrate on the clt sensor, the iat sensor, the variable reluctance sensor's shielded cable, and the tps. those are the sensors that get dedicated grounds back to the controller.
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Deckers
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My question is: Since you like to run enormous levels of boost. Why didn't you go with a Mercedes supercharger? Turbos are nice, but in a real push - Supercharge.
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Nissan Supercharged 3 cylinder Engine link This one uses the Miller cycle engine timing system and diamond coated piston rings for 30% lower friction !

And another point I have reservations is oil starvation. High compression {and thus also Turboed engines} engines leave alot of oil upstairs in the heads and in the cylinders due to piston ring push. So once that happens, the bottom end runs dry. I know this because of several Cobrajet engines built to extremes and blueprinted by myself and others pitching in. This kid of stuff gets more expensive EVERY TIME.but you know that already I'm sure.

These types of boost pressure can also result in INSANE levels of oil pressure - which is another topic entirely.

I would want a oil reservoir can on this thing to dump in an emergency qrt. of fluid and repump it back into the reservoir once the OP raises. They used to make a pressurized can that dumped in automatically in such a situation, but now most are just running dry sumps and windage trays and crank scrapers on the pan.
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This one is for a two cylinder motorcycle engine.

http://www.moroso.com/catalog/categorydisplay.asp?catcode=22521

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Dry sump pump{Three line system}

See Turbine engine design details here at:
http://www.free-ed.net/sweethaven/MechTech/Aviation/ch05.htm for an idea of my issues about this extremism. :thumb


The fuel injection manifold sounds really interesting though.

More really Cool stuff for personalized cars and engines.
Edited by Deckers, Jul 10 2011, 10:21 AM.
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Deckers
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Don't get me wrong though. Bless your heart for trying so hard. I'm impressed, but I wouldn't let a woman drive this thing for a million dollars.
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Coche Blanco
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Is he running that much boost? lol I thought it was around 10psi or something.
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