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- 1989 RX-7 GXL Blaze Red
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Drag Truck Build Thread
- Thread starter Cleverfrog
- Start date
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- 03.5 YLW MSP
WOW I can honestly save I've never seen a setup like that...
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- 1989 RX-7 GXL Blaze Red
The compounded turbos, from what I've seen and heard, drastically reduce spool time and increase spool speed. The exhaust initially charges the large turbo and then the large turbo charges the twin smaller turbos and the smaller turbos recharge the large turbo. Like recycling boost. the large turbo pushes the boost into the intake and the small turbos are the exhaust. It sounds really weird but, it's a proven setup in the diesel community.
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- 99 protege
damn thats freaking awesome! i love that pipe... s*** looks cleeeeaannnn
AzteCypher
black ops modifications..
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- 2001 Mazda Protege LX
Wow! That's going to be an insane build!!
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- 1989 RX-7 GXL Blaze Red
I know his current truck with two turbos (also compounded but, only with 1 big and 1 little) is making around 1200 HP to the wheels but, the race truck won't be street legal.
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- 1989 RX-7 GXL Blaze Red
I'm new to it as well, especially this stuff. I don't think turbulence is an issue with the amount of pressure its going to be making. I'll have to ask but, I'm almost certain I heard around 100 psi. Remember though that this isn't a mazda engine or a gas engine, it's diesel. Engine that runs exclusively on compression. No spark plugs.
You can do fun things with diesels. They're already built to withstand anything you can throw at them... so why not throw more?
That triple setup isn't much different than a standard sequential turbo setup... other than the fact that two feed the larger one.
That triple setup isn't much different than a standard sequential turbo setup... other than the fact that two feed the larger one.
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- 1989 RX-7 GXL Blaze Red
They may be built but, they do still break just like any other engine. I'm not allowed to post any specs about the forged internals or the built trans. The pistons are totally custom made. One of the big worries is a "runaway". Which is when you shut off the motor and it keeps going and/ or when the boost goes out of control. We've had to design a safety that shuts off the air that's going into the engine. A lot of times it's said that the "runaway" is caused from a bad turbo leaking or some other oil getting into the firing chamber. When this happens the motor will rev itself up to high rpms (for diesels 4000-5000+) and fail mechanically. You can shut the fuel source off but, the engine can still run on the oil mist so, you must kill the air source.
here's a link about diesel runaway http://en.wikipedia.org/wiki/Diesel_engine_runaway
I'm trying to be as informative as possible. There may be more than what I post. So, if you don't think something is right please don't hesitate to research and share your own findings!!!
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Well yeah... but most people aren't shooting for 1000 hp either. Riding in a mildly built up powerstroke gave me a good appreciation of what you can do with the factory design.
Runaway is definitely a problem. My VW Rabbit had it from time to time. Nowhere near as bad as it can be tho. It will scare the s*** out of you when it decides to just take off while cruising. I didn't think that little 55hp engine had it in it.
Runaway is definitely a problem. My VW Rabbit had it from time to time. Nowhere near as bad as it can be tho. It will scare the s*** out of you when it decides to just take off while cruising. I didn't think that little 55hp engine had it in it.
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- 1989 RX-7 GXL Blaze Red
From what I've heard you only have a matter of seconds to kill it before it's non-rebuildable
Yup. At least with something crazy powered like that. When it happened on my VW, I would just stand on the brakes, hit the key, and let it calm itself down. It didn't have enough guts to over power the brakes, so it just worked really hard for a few seconds.
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- 1989 RX-7 GXL Blaze Red
Oh that's right! If you have a manual you can do that. An automatic is a different story. I forgot to mention that it's an auto.
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- 1989 RX-7 GXL Blaze Red
He's trying to make it as quick as possible and with an auto trans (if it's built right with ratios and all) is the best way to go I think. Quicker gear changes than a manual can offer. I know it may be debatable. I'd personally rather drive a manual any day of the week. I love knowing what gear I'm in.
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- 1989 RX-7 GXL Blaze Red
Agreed, It initially started about a year ago with a motor build and bought chassis. He's been waiting on funding and having good time. We're pretty slammed at work right now but, he's still hoping to have it ready to race. I was talking to him about it yesterday and he was saying that we might have to do a mechanical fuel pump this year for time and go electronic next year. The difference is power at higher vs lower rpms. the mechanical will require higher rpms for good power vs the variable time electronic pump.
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- 1989 RX-7 GXL Blaze Red
Ok, I've got a couple small updates with some more pictures.
Heating up the cam gear to seat it on the cam. Super tight tolerances.
Some pictures of the block work.
Enjoy!
Heating up the cam gear to seat it on the cam. Super tight tolerances.
Some pictures of the block work.
Enjoy!
