1268 replies to this topic

[Doctor Ed]

spent the arvo tidying up, measuring some stuff, and doing some small bits so i could start calling things 'done'

 

as mentioned above, i managed to get the gap to the wastegate actuator out to 4-5mm. tried putting the car in 1st gear and rocking it to see what a torque load did... barely moved 1mm, and after thinking to myself hey, thats pretty good, i realised that the lower motor/torque mounts werent even fastened. so yeah, hopefully itll be just fine

 

 

[Doctor Ed]

got a chance to pay a bit of attention to the intercooler piping, and cut stuff properly to size. 3" hose/pipe isnt small, and im not exactly blessed with space here! pretty happy with the way it all lines up though. nice short run from the compressor outlet to the throttle over all.

 

W2A core fittings are 3", so post cooler piping is all 76mm stepped down to 70mm with a silicone reducer immediately before the throttle body

 

[Doctor Ed]

started looking at exactly how much space ive got to bring the compressor outlet pipe straight over the top of the engine and down into the cooler core.

 

63-76mm reducer elbow into the cooler core

 

[Doctor Ed]

over the top of the engine is tight. 63mm might be a little optimistic, but the alloy coupler pictured is around 70mm. conveniently the mesh insert of the motor cover is in exactly the right place to allow a bit of room to get a pipe past. its going to be tight, but everything is tight, so no surprises really. as long as its doable

 

 

 

[smiley]

Here is a sample of engine movement with poly inserts.

I doubt 5mm will be enough.

 

[Doctor Ed]

yes and no. the motor rocks, and from what i can see it rocks/rotates in such a way that the actuator rotates down, maintaining the gap to the subframe (kindve).

 

one way to find out!

[Rosssco]

I thought about modifying / bodging a flattened cross over pipe like this one:   http://www.illusiona...pics/engine.jpg   Or, cutting out the mesh section and bonding back in just a slightly taller section

 

P.s. - Glad to see the engine in money shots

[Doctor Ed]

Its tight, but 63mm might just fit Ive found some 80x26mm Oval Aluminium pipe too, though that would be. Major fuckaround to make

[alexb]

The pipe diameter after the turbo can be smaller because you move air under pressure and the important factor is the speed of the air through the pipe. Higher pressure equals to lower air speed. For around 320-340 HP, you should be able to get away with smaller diameter pipes, especially for that small part where you go over the engine. Obviously all bends and other obstructions add to the pressure difference of the whole system, but I wouldn't worry too much.

 

About that PWR barrel, do you have any data about it? The only thing I can find is 'good for xxx HP', which is kind of a nonsense statement. Or perhaps a better question: why this specific size and not bigger or smaller?

[Arno]

- Tesla Roadster uprights (first car in space!)

Yup... Correct..

Looks like it's missing it's uprights and brake discs alright! (see the light through the wheel..)

 

Although I suspect most of the bits under the clam apart from the alu tub are missing from the 'car' anyway to keep the launch mass down..

Bye, Arno.

[alexb]

That's weird. The payload of the Falcon Heavy for that kind of orbit is over 10 tons. Tesla's are heavy, but not that heavy, so why remove parts? Normally they use water or concrete for these type of test flights.  As it's Elon Musk's own roadster, all I can think of is that he was modding it and got tired of it. Sending it to the stars must have seemed like a good idea and he got the means. Or perhaps his wife, tired of him spending too much money on the car  ...  Did they ever check what's inside that suit?

[Rosssco]

Did they ever check what's inside that suit?

 

Rumour has it, one of his enemies.. I think the weight was probably selected to match the weight of a potential satellite being lined up to be launched, although the 'standard' Falcon rocket probably has that payload capacity alone..  

[Doctor Ed]

Or perhaps a better question: why this specific size and not bigger or smaller?

 

because thats the one that fell at my feet at the right time for the right price. its probably Overkill for my setup, but as i could make the space for it, theres certainly nothing wrong with having a slightly bigger core than the maths say is necessary.

 

im pretty sure dominik did some core pressure differential testing at some point (coincidently he has the same/similar PWR core) - he might chime in with what he measured (i cant remember).

[BadCop]

The pressure drop is ridiculously low - even when you max out that K04 turbo at 2.1 - 2.2bar.

It was like 0.1 bar or below.

And although the turbo is very inefficient in that high range - the PWR always keeps the IAT under ambient + 10°

So the maximum I ever reached was 46°C IAT on a hot 38°C day.

A better suited turbo would further drop the IAT,

 

 

Someone told me PWR rate them for a 0.25bar pressure drop.

So the rating of 600 hp equals to about 490 g/s or 380 litres /s

 

-->  0.25bar @ 490 g/s

 

To keep it easy for the simple chap they just tell you "600 hp"

[alexb]

OK, thanks for the info. It is strange that they rate these things by pressure drop only. In that case, the best performer would be a straight pipe. It's far more interesting to have some information about the cooling capacity in combination with the pressure drop. But it looks like it's doing a decent job, 10C above ambient at a pressure drop of less than 100 mbar is very good.

[BadCop]

Just what I was told

Think you could get more detailed information from PWR.

 

Yep - best I measured so far.

Most front mount IC drop 0.2 to 0.3 bar if they are sized correctly.

Too small ones will create much more...

 

Think the Pro Alloy 7-row Chargecooler had about 0.3 bar (but I didn't measure that myself, just read it somewhere on a german forum)

[alexb]

Answer from PWR Europe (they are quick!): HP rating is based on experience and it's always better to use an oversized intercooler. For about 400 HP, they recommend a 5"x10", rated at 500 HP. Which happens to be the one I was planning for. Only challenge is to find a place for it. Oh well, plenty of room on the outside of the car ...

[cookster501]

Answer from PWR Europe (they are quick!): HP rating is based on experience and it's always better to use an oversized intercooler. For about 400 HP, they recommend a 5"x10", rated at 500 HP. Which happens to be the one I was planning for. Only challenge is to find a place for it. Oh well, plenty of room on the outside of the car ...

[cookster501]

Iv mounted my pwr on top of my engine it also helps reduce the intake track

[Doctor Ed]

cut the firewall out! lol

 

if anyone ever wants to do this btw, ive got the design for my modified wall saved as CAD for cutting/folding