Let the tinkering continue.....

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Originally Posted by cogdoc

The main pitfall exhaust wise is that the JBS DPF delete downpipe is 2.75", and whilst this is plenty big enough, if I truely want next to no restriction, I need a bigger dump pipe. Need to chat to Gav and JBS about that, and tossing up the idea of a parrallel 1" pipe giving 3.75" total, into a 3.5" cat back with perhaps a single big bore jap straight through muff. The jap stuff flows very well overall from what I read. Would only liberate the last 10hp, but heck, if I'm gonna spend the money, might as well go large!

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G'day mate. Just a note that the cross sectional area of a pipe is proportional to the square of the area, so adding a 1in pipe to a 2.75in pipe in parallel will give you a cross sectional area equivalent to a 2.9in pipe, not 3.75.

Also, most of the losses in the pipe (pressure drop) are a result of friction between the walls of the pipe and the gas. These losses are proportional to the square of the velocity of the gas.

So, if you double the diameter of a pipe, you increase the area by four, and reduce the velocity by a factor of four (and therefore reduce the friction losses by a factor of four squared, or 16)

P.S. any mechanical engineers here please feel free to add re. losses in a gas pipeline, I usually only work with water :)

Gees Greg you're really going hard core with this sucker. I like it. :bowdown:

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Originally Posted by cogdoc

Oh and Preeny, I'd try 100% nitro injection just for giggles, might have to do a little research on it though!

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With what, 17.5:1 compression? That'll throw the crank into the road.. Literally. Nitro engines don't break, they explode. Haha. :eek:

18.5:1 Preeny!! Where can I get methanol in bulk mate? VP fuels??

Given the DMF and gearbox etc is still stock, I reckon I'll be pushing things with just the delete, tune and Snow kit. See what happens.

Interesting stuff Phil, seems I need to enlist some more time into working this out, but it sounds like yet another vote for bigger is better? But how big is too big??? Seems odd the monster SUV's in the USA that run 500-1000hp use 4" and 5" systems, and here I am with a third the capacity, but more revs, talking 3-3.5". Seems excessive, even to me, and I'm keen to go nuts!

Anyone from Bris have any recommendations as to who can do nice inlet plumbing welding, and who would be right into the exhaust end of things?

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Originally Posted by Preen59

Gees Greg you're really going hard core with this sucker. I like it. :bowdown:

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Was always the plan mate, just started out slow covering all bases, doing my research and testing. Also knew DPF deletes would be the answer, so as soon as one became available, I jumped onboard. Should be an interesting year. Hope my gearbox survives it!

Greg, when we were racing post classic road racers we bought our methanol from a chook farm. Apparently chook poo is used as the bio mass. It might be worthwhile talking to the speedway boys about where they get theirs from.

/methanol.htm

http://holdren.com/methane/operation.php

FYI, A 200l drum of racing methanol is about $230. Yeah that's correct, it's about $1.15 a litre. The price hasn't changed in a couple of years. We recently just bought a drum off a friend who races Sprint Cars.

(Methanol used to be twice the price of petrol/diesel... You tell me we aren't getting ripped off for our fuel!!)

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Originally Posted by philthy

G'day mate. Just a note that the cross sectional area of a pipe is proportional to the square of the area, so adding a 1in pipe to a 2.75in pipe in parallel will give you a cross sectional area equivalent to a 2.9in pipe, not 3.75.

Also, most of the losses in the pipe (pressure drop) are a result of friction between the walls of the pipe and the gas. These losses are proportional to the square of the velocity of the gas.

So, if you double the diameter of a pipe, you increase the area by four, and reduce the velocity by a factor of four (and therefore reduce the friction losses by a factor of four squared, or 16)

P.S. any mechanical engineers here please feel free to add re. losses in a gas pipeline, I usually only work with water :)

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its all a fluid in the end mate, thanks for chiming in there with good info.

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Originally Posted by Preen59

FYI, A 200l drum of racing methanol is about $230. Yeah that's correct, it's about $1.15 a litre. The price hasn't changed in a couple of years. We recently just bought a drum off a friend who races Sprint Cars.

(Methanol used to be twice the price of petrol/diesel... You tell me we aren't getting ripped off for our fuel!!)

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Originally Posted by craigy

Greg, when we were racing post classic road racers we bought our methanol from a chook farm. Apparently chook poo is used as the bio mass. It might be worthwhile talking to the speedway boys about where they get theirs from.

/methanol.htm

http://holdren.com/methane/operation.php

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preeny, theres you answer :-)

Very interesting.

I should point out that "racing methanol" isn't 100% methanol. I'm not 100% sure what else they put in it (and they're not going to tell you), but it has other things in it to produce more power and burn cooler. I know that "Shell Racing A" used to have acetone and a few other goodies in it...

Having said all that, i'm sure for what you are doing, Greg, whether you use racing methanol or bootleg methanol, it will work just fine.. :)

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Originally Posted by Preen59

Very interesting.

I should point out that "racing methanol" isn't 100% methanol. I'm not 100% sure what else they put in it (and they're not going to tell you), but it has other things in it to produce more power and burn cooler. I know that "Shell Racing A" used to have acetone and a few other goodies in it...

Having said all that, i'm sure for what you are doing, Greg, whether you use racing methanol or bootleg methanol, it will work just fine.. :)

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The final result will be the same

http://www.freeimagehosting.net/uploads/444016e682.jpg :grin: