Looking for a 4G63 to rebuild.

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It's a run of the mill 0.9 bar George. I was talking to the guy that crews for me about this, my thinking is a higher pressure cap just increases the pressure in the system. He reckons the less water going to the expansion tank is more water in the system cooling the engine. What's your experience say?

I just got the car of the trailer, found the mani to turbo gasket has parted company. This was a good mls seal, I'm really starting to think this cooling issue is more to do with the small turbo and tune and the resultant back pressure rather than the cooling system itself.
 
as mike pointed out earlier it could be a lack of timing making combustion temps sky rocket.

could have burnt out the gasket?
 
A 0.9 cap lifts the boiling point of plain water to 115º every 1psi increase is 1º increase in boiling temp. Once the water boils it will pump out the cap. The higher the pressure the better. But you can start popping core plugs out.
Yes you should be able to lift the cap on a 85º engine temp. I think it shows the system is working well for it to cool down quite quick. It seems you are just putting too much heat into it.

It might pay you to check that it is holding pressure. Put 14psi into it by pumping back through the overflow hose.It should keep a hard hose for hours. I think its a better test back through the overflow as it checks the cap to radiator seal as well. Mine iwas tricky to get to seal there as its a strange depth of cap and a bit of a divet in the seal stuffs them
 
It's possible mate. I did wind some more in for this event, and I'll post some logs up tomorrow so you lot can pick through them. The haltec software is free, so can post up my full maps/logs and a link to the software so you more edgabicated blokes can give me your input. I don't do this for a living or for profit so I do value the input for what it is.

(edit, thanks jack and Brian. Was a delayed post as I was chatting with uncle Brian )
 
Turbo is off. Seems in very good condition. Holding it in my hands and trying to work out what it all means. There was gas getting out of the area were the cold and hot side join as seen in the pictures, I guess this is more signs of way too much pressure build up. TDO6SL with a billet wheel seems like a good way forward.

photo 1 (1).JPGphoto 1.JPGphoto 2 (1).JPGphoto 2.JPGphoto 3 (1).JPGphoto 3.JPGphoto 4 (1).JPGphoto 4.JPG

You can get the haltec software here:

http://www.haltech.com/downloads-2/ecu-software-firmware/

But the site wont let me load the files so it doesn't matter. If your that keen you can email/PM me and I'll send them to whoever wants a look.
 
And it burnt a hole in my nice new shiny manifold bag. Not happy Jan.

Just reading some suff on strokers and rod ratio's this morning and when you get into the nitty gritty about the piston behavior in a stroker, the math says that the point of max tourque effiencey about 2.25* earlier than a standard stroke 4g63. Theoretically this means you can run your whole ingnition map 2* more advanced, all other things being the same. I didn't take that into account when building the timing map.

Having a better look at my logs, the compressor is falling over pretty much as soon as it hits boost. The wastegate at no point opens to control a rising boost situation, it in fact starts closing after about 5000rpm because the compressor has said 'fuck this shit' and just starts chopping the air, making the ECU think it needs to close the gate to increase boost. So basically after 5000 the exhaust restriction is being made worse by the ECU trying to do its job. By 6800 the wastegate is effectively shut, but no doubt just being forced open by the huge amounts of back pressure.

While researching turbo stuff, there seems to be very little info on turbine sizing. Does anyone know if there is a basic number figure than can be applied to the difference in flow between a td05 and td06 exhaust housings? I know there is more to it than that, but let's just say you have a td05 20g and a td06 20g on the same application, is there a rough percentage you could say that the 06 housing flows more gas than the 05 housing irrespective of what's happening on the cold side?
 
Our fastest lap video from the last event. Co-driver was well happy with the time! Time was 15th fastest outright but lack of consistency gave us 17th outright.

http://youtu.be/8XriPTF_7K8
 
I have a feeling your not going to let this go mate....

Dammit...... forever known as a little pink pig.........awesome
 
picturescafe_002.jpg
 
maybe you could try building the boost more slowly and have more timing down low?.

It would let the turbo breathe more until higher in the revs
 
I think progress has been made in this area. We can just say that a 'rather large' amount of exhaust restriction has been removed. The results seem promising, spool is longer and the wastegate is actually doing something now, it's actually working to control boost.

I'm too much of a pussy to muck around with the timing too much without going on the dyno, but I plug the detcans into the terra phone system during recce and that lets me add timing progressively while keeping an ear on it.

Find out next Thursday. The last round is on and we will be going all out to break something.
 

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