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Discussion Starter #22
Well my 50mm thick aluminium rad upgrade solution arrived today... hopefully this will cope with whatever the V8 can throw at it...



Here it is fitted, still got top brackets to make...





All of my standard steel radiator pipework has been ripped out and much larger diameter aluminium pipes run from front to rear, so no part of the stock aw11 cooling system remains now.... well it's an MR8 now isn't it!
 

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That looks really nice :thumbup

I wonder if I need to upgrade the radiator and pipes for my own project. THe mark2 uses pipes that are 1.25 inches in diameter. I already have a stock turbo radiator to put in (as my project car was NA).
 

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Discussion Starter #25
I have started to weld in the chassis bracing, strength is my number one priority regardless of weight on this build.This engine revs so violently i'm not going to take any chances.



 

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Wow, very impressive work.

Considering that the MKI engine bay is kinda short and wide, and the MKII engine bay is a little longer and narrower, I wonder how well this would fit in a MKII... I'm sure that it would still have to protrude into the passenger compartment, but I wonder how much...
 

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Discussion Starter #30
If you search MikeH's posts here you will see his Mk2 version.It only protrudes into the cabin by a little from what i can tell by his pics.
 

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paul woods said:
If you search MikeH's posts here you will see his Mk2 version.It only protrudes into the cabin by a little from what i can tell by his pics.
Thanks. I don't frequent the V8 forum enough to know all of the projects that are going on :)

I probably will never atempt something like this myself, but it sure is fun to read about. :thumbup

EDIT: I take that back. I found the thread, and it turns out I actually had posted in it, I had just forgotten about it :clumsy:
 

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Discussion Starter #34
After studying the audi cooling system (as it would be on the S8) i discovered an Mr2 coolant filler point was not going to work, the highest rated cap i can find for the Mr2 is a 1.5bar Sard cap, and the S8 runs closer to 1.7bar max pressure.... so using the mr2 filler neck was binned off.

So i needed to look at the VAG way of doing things, and took a punt on a VW golf custom expansion bottle, this will plumb up correctly to the V8 system and will have the S8 stock 22psi cap fitted, it's also a bit of eye candy in the engine bay.



 

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Discussion Starter #35
More test running, this time with a fully sorted cooling system, twin 11" spal fans on my radiator, hooked up to the stock Mk1 rad switch/relays and VW expansion bottle with 22psi cap.

It ran for 15 minutes with no fans on, then when it hit 88* at the EFI temp sensor the rad fans came on slowly (first stage), the temp then climbed to 92* over the next 15 minutes (no revving at all so just letting it heat soak as much as possible), no water pump hurling the coolant round quickly, just idle.At 92* the fans kicked in to their second stage and stayed on, the temp rose to 94* at the EFI sensor for 2 minutes before dropping back to 92*, fans went back onto their first stage and the cycle repeated itself.

After this idle heatsoak test passed i let it get to 92* and then revved the throttle and the temp instantly dropped back to 88* so my cooling system is perfect for handling this v8.

Here is my second test running video, this was early on during the warmup, EFI only at 50* or so.Everything in the bay is still dummy rigged so if things look in an odd place it is only temporary.

http://www.youtube.com/watch?v=iwZLbNwc7_U

I am still getting bad trigger errors during cranking and oddly at no other time? but this will be rectified soon.
 

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Awesome Paul!

Have someone hold the video camera while standing behind the car, while you rev it, so we can hear that V8!
 

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Discussion Starter #37
I would have done that today chris but i was on my own, i will see if i can shoot one more vid before it all comes apart for the final time.
 
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