Turbo Samurai.. Hey why not?

All the oily, spinning bits

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Rotozuk
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Post by Rotozuk »

Well, I got an invite to cruise on over here.. So here I am. Very nice site.

I spent some time a while back and created a 4G63 turbo powered Suzuki Samurai. I used one of the infamous Toyota "W" series bellhousings made by a guy in Florida, and did all of the rest of the work myself. Too bad the bellhousing was less then ideal. Eventually I got one that kind of fits, and I have been beating the daylights out of the rig ever since.

Engine is basically stock, but does have a ported 16G turbo, 3" mandrel exhaust, and large FMIC. Muffler is good for an honest 300 hp (I forget the exact number). I am slowly collecting items to tune for the 300 or so HP mark. I will only tune in ways that does not hurt my bottom end torque as most of the time I'm running this rig at very low RPMs, and I never even get into the turbo when I am doing my serious work with it.

How about some pics?

Here is the engine during build up. Note, I did not flip the turbo, but do plan too.
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Serpentine belt set up. I have a large Saginaw steering box where the A/C used to be.
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Here is the horrible bellhousing:
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clutch set up: (All DSM except for the Toyota disk and fork)
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continues in next message..
Rotozuk
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Post by Rotozuk »

Electrical:
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Marked and labeled every wire then removed what could go..
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It starts looking better.. (Also note that I rerouted some parts of the harness since the throttle body is reloacted.)
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Yep, even built my own exhuast:
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You think your drivetrain is long? Ha! Toyota W56 5 speed, Marlin crawler and Toyota t-case (twin t-cases)
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and since most all Japanesse gauges are made by the same company, they are pretty easy to swap over. (except the turbo gauge, kept for CPU output and programming)
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next...
Rotozuk
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Post by Rotozuk »

Intake manifold modification:
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With a little paint it looks stock.
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So this one had to die...
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To make....
Rotozuk
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Post by Rotozuk »

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-Wayne
Rotozuk
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Post by Rotozuk »

So I can do this..

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It makes me happy. :rolleyes:

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Any questions?

-Wayne
Rotozuk
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Post by Rotozuk »

I'm in the process of making this:

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It will replace that shitty bellhousing. I was going to make these adapter plates available to others, but the task keeps getting more expensive, so I have all but decided to pass on making more then one. I'd need to make 10 at a time to keep it affordable for others. (Down to a few hundred bucks) Basically it takes a DSM front wheel drive transmission case and allows you to bolt up the Toyota "W" series transmissions. These include the trucks, vans, celica and even Supras. Pretty much most of the rear wheel drives that Toyota made up until about .. Well until they stopped making rear wheel drive stuff.

I think the Supra (single) Turbo tranny should hold up well for you guys..?

I had a few people interested, but that was about it.

During Easter we took it out to Moab for a lot of fun. I ended up busting the cross pin in the Toyota 8" rear diff. This also damaged the locker, and I discovered that my ring and pinion were really thrashed also. So that was that. I'm getting ready to do the next stage of build up on the beast. going to get some new suspension, a longer wheel base, a better cage, better motor mounts, the new adapter, etc.


A little about the vehicle.. The engine has been VERY reliable. Clutch set up is pretty much all Toyota and it has great feel. The twin t-cases and 5:29 ring and pinion gives me a crawl ratio of a little better then 100:1. This means I can put it in first, low, low and with the clutch engaged (vehicle moving) I can get out and walk around the vehicle. Yep, this is a SLOW 4G63. The 37" MTRs do a very good job in the rocks, sand and highway.

I don't think I have gone much over 85 mph. Not that she can't, just that I rather not. The spring rates are very low on this vehicle, maybe 150 lb/in. My suspension travel is measured in feet. Your spring rates are problem over 250 lb/in and you probably only have 4-7 inches of suspension travel. Thus not a high speed monster. But get me on a nice dirt road, or a sand dune and I'm hitting the fat pedal for all she is worth. The clutch does start to slip when I get into boost (about 14 psi) when in a rather high gear in the sand. The vehicle is moving at maybe 20 mph, but the wheel speed is probably close to 50-70 mph. Can you say rooster tail? It's kind of like a big Quad in the sand.

About the biggest issues I have had since I got it running is with keeping the rear axle from twisting up from the torque loads. I have a large ladder bar installed to help protect the leaf springs from wrapping, but eventually that wasn't even doing the trick. Thus my new suspension plans. Will be going with a 4 link and air shox. Also installing a beefier Toyota V6 rear end.

Well that's about the highlights.. Let me know if I can help you guys out.

-Wayne
asian312
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Post by asian312 »

Good to see you made it out. Just our of curiosity have u ever dynoed that thing? :blink:
Joel07
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Post by Joel07 »

Wow! That looks like an awesome truck! I'll bet with that much transmission your driveshaft is about 4" long... :lol:

One things for sure, I'll bet there's not another one like it anywhere! How are you making the adapter plate? I thought of building something myself, but I'm not sure how to make sure that the tranny stays concentric with the motor...
Well, now I've got the truck, should I do the swap? :)<br><a href='http://www.handcraftedracing.com' target='_blank'>http://www.handcraftedracing.com</a><br><a href='http://storm.prohosting.com/likness' target='_blank'>http://storm.prohosting.com/likness</a>
DJpowerHaus
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Post by DJpowerHaus »

I remember finding your site last fall and just thinking that "hey this guy is my hero". I really think your site and your Samuri are like the coolest things in the world and I'm honored you decided to come by.

We all are waiting for more options for the transmission. I know of one guy on the Starion boards, Shawn, to make a custom cast belhousing for the W series transmission. I also am hoping to see more on your site about the adapter plate. It would make life alot easier I'm sure.
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Getting the engine bolted in is about 10% of the way there.
The next 80% can go quickly with help and skill.
That last 10% takes about as long as the 90% that came before it.
Rotozuk
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Post by Rotozuk »

Nope, no dyno on her. I have no baseline to start with.. Not sure I will when I think about. Dyno pulls don't really mean that much to me. Vehicle performance is far more important. To me a dyno is simply useful for some to help tune. As far as people trying to brag about the numbers they scored on a dyno, I consider that 100% worthless. No 2 dynos will report the same numbers, so what good is it?

The rear drive shaft was a bit of an issue. I ended up moving more engine forward and tilting the t-cases down more then I wanted. It now has a very good angle, and good length.
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The adapter plate is not an easy process. My proto type was made up by a guy that goes by the name of Wild Bill. He machined it up in his spare time. He is working on dropping a 4G63T into an early Datson convertable. But first he needs to finish off his CRX that is powered by a twin turbo Nissan. I think he has earned his name. He has some other interesting vehicles also.

Anyhow we got his plates, and decided we needed to add some dowels and the such. Bill is not sold on this though. I imagine he will have the prototype available once I send it back to him. It does seem to be fully functional.

The process involves some use of a large end mill, and a fair amount of time. Keeping things centered is not always an easy task. If we develope drawings and I do not try to make these up for folks, perhaps I'll publish the CAD files for others to use...?

If the guy that is making up the custom bellhousings for the "W" series is Andrew of Florida, I must warn you to stay away. That is the guy that made the mess that I'm currently using. The first one he sent me would not even fit. The second one he told me was off his race car and was perfect. When I got it it was not perfect, and I made it work. I'm sure it is not centered, and is creating more problems for me down the line. Killed bearings in transmission and rear main seal leak.

Thanks for the warm welcome. Sorry if I'm a little snippy in this post.. It's a Friday at 5:30 pm and I'm stuck at work waiting for a customer... Then I only have a few hours of work before my day is over.. I'm ready for the weekend.

-Wayne
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Post by Joel07 »

No 2 dynos will report the same numbers, so what good is it?
You got that right! Dynos are great for tuning, and if you're about to make a change, it's nice to compare before and after (as long as it's on the same dyno), but as far as bragging rights, I always laugh when people brag about that stuff... :lol: Same thing goes for engine dynos, the guys at my local circle track always brag about how this motor that so-and-so built pulled 425hp on the dyno, but what they don't know is how much better that dyno can make an engine look...
Well, now I've got the truck, should I do the swap? :)<br><a href='http://www.handcraftedracing.com' target='_blank'>http://www.handcraftedracing.com</a><br><a href='http://storm.prohosting.com/likness' target='_blank'>http://storm.prohosting.com/likness</a>
asian312
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Post by asian312 »

It's not the HP numbers I'm interested in, but the torque. I know it's easy to fudge numbers on a dyno and that it even get more complicated with engine and inertial dynos. But lets face it, that little Samurai has gots to have ridiculous amounts of torque!
Rotozuk
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Post by Rotozuk »

<!--QuoteBegin-asian312+May 9 2004, 06:23 AM--></div><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td>QUOTE (asian312 @ May 9 2004, 06:23 AM)</td></tr><tr><td id='QUOTE'><!--QuoteEBegin--> It's not the HP numbers I'm interested in, but the torque. I know it's easy to fudge numbers on a dyno and that it even get more complicated with engine and inertial dynos. But lets face it, that little Samurai has gots to have ridiculous amounts of torque! [/quote]
Torque is still stock at this time. I have not changed injectors or cheated the computer... Yet.

It moves out OK, but the big tires and mushy suspension and all of the gearboxes do eat up their share of power. Still quicker then any of the V8 powered rigs in my club. And at altitude in the mountains, I still have all of my power where the V8s start running a little low. That's got to be the best part of a turbo application.

Total torque do to multiplication is crazy. Tranny first gear is something in the 3 range, then each t-case is 2.58 (I think) and the ring and pinion is 5.29 so.. So multiply the torque produced by 105 and you get the idea. 200 ft lbs would equal 21,000 ft lbs at the axle shaft. and since all corners are locked, any given axle can see 100% of that torque given enough traction. Needless to say, the tire can not hold that much traction unless it is buried in cured cement. If it did, something would bust.

-Wayne
DJpowerHaus
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Post by DJpowerHaus »

Can you put it in the lowest gears and take it to redline... get out.. and walk faster? hehe..

I'd really like to hear more about what your power mods in the future are going to be.
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Getting the engine bolted in is about 10% of the way there.
The next 80% can go quickly with help and skill.
That last 10% takes about as long as the 90% that came before it.
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