BC

Where did you get red Cayenne coils? The ones I have are black. I feel ripped!

Lizard928

I would love to find the plugs for the coils at a more reasonable cost and then I would do that.

BC

yes, the loom/plugs are the expensive part. The coils are only 12 bucks.

Lizard928

Brendan, could you post a pic for me of the plug part of the cayenne coils? as well as the link as to where I can get them at that price?

TIA

BC

I said the coils are 12 bucks - just to be clear. The plugs ARE expensive. Let me get a pic tonight. The coils are 12 bucks at sunset porsche - more towards up by you. They were 12 bucks in 2006 at least.

Lizard928

Thanks Brendan, I can get them from a canadian place for $21 cdn, but $12 USD is only $14 cdn

Roy928tt

Hi Colin I've only just joined Rennlist, I've also put together my own Twin Turbo 928, on a much smaller scale and budget tho. I'm rather blown away by what you are doing there, the sheer scale of the project is impressive, respect.
I get the impression that, like myself, you work in oil and gas, correct?
I think ultimately you will end up building a lower compression ratio engine to extract the most from your 5 litr, we find ultimately that by dropping CR and screwing in a bit more timing more power can be extracted. The other emerging tweak is to run on E85 (85% ethanol ) typically gains 10% at the wheels after tuning.......
Keep up the great work, looking forward to the next instalment.

Cheers Roy

Lizard928

Hello Roy,

I actually do not work in oil and gas, I work strictly in the mineral exploration line of business. Which has taken a bit of a tank recently But thankfully I have lined up some work in mexico and will be getting out of this damn cold weather.

I have been busy working on the fuel cell and rad relocation for the last bit.




I just finished building the lower cage/support for the fuel cell this evening. I am also needing to get a couple sheets of really thin aluminum sheet for enclosing the radiator and routing the air.

I am not sure if I have added this one already or not, but the plumbing for the drysump is done, all except to the tank which I still need to make.


As to lowering the compression ratio and pumping more boost in. Yes it is completely doable, and yes I could extract more HP. However my power estimates are for around 650whp, that brings me almost into the 4:1 range with how much weight I will be pulling out/off of the car. Anything lower than 4lbs per HP gets into an area of undriveable. Plus I am running a very stiff suspension which means that I really have to be able to maintain smooth inputs/controls or I am going to end up in the weeds. If I am unable to hit 650whp with the setup I am having here, then I will at that time consider building another engine and lowering the CR at that time for higher boost.

I also thought I would comment on your location, I was in australia in 96 for 5 weeks went from sydney to north rockhampton/yeppon area. I had a blast, but I do have to admit I really enjoyed the Jenolan caves in the blue mountains. Would love to take another trip over there, but more of Europe is first on my list.

IcemanG17

Colin
Is that the final location of the radiator......or are you going to build some type of shroud-ducting around it.....it looks like it would make the interior HOT HOT HOT too me....since my stock race shark gets pretty hot inside already........

mark kibort

Tell me thats a placement joke for the radiator. Is it?
If not, I would love to hear the logic around it.

Tass 928

Colin,

I installed the same cell and had fuel starvation problems on right-hand turns. I ended up swapping it out for bladder type racing cell (copied from Dave lloyd's race car.) I'm running a single stock fuel pump and have it mounted slightly lower than my fuel cell. Hopefully you will avoid this problem but I thought I'd share my experience.

Tass

[QUOTE=Lizard931;6241191]


I have been busy working on the fuel cell and rad relocation for the last bit.

Lizard928

Tass,

Thanks for the information on the tank, only time will tell on the tank as I am going to try it first. But I do thank you for your input on this.

Brian and Mark,

that IS where the radiator will live. Yes it will be fully shrouded. I will probably end up putting some things on the inside of the shielding to help keep the interior heat down.
There are a few reasons for putting the rad here. With the car being twin turboed I will be fighting underhood temps already, my plan is to run a LARGE air-air intercooler in the end and I am relocating it for 2 reasons. The first, heat soak. The second is that ALL the air that can enter through the front will go through the air-air intercooler, it will then have full ducting to vent it out the TOP of the hood. Thus preventing as much air as is possible from getting trapped under the hood and eventually under the car.
With the radiator in the front this ducting simply is NOT possible. Well beyond the amount of work I wish to do.

Then we get to the benifits of having the rad here.
I will be cutting a hole right above the top of the tranny, this is where most of the air will come from. This will increase the amount of air travelling over the case of the transmission which should help keep it cooler and minimize the case from expanding. Then the radiator also has a oil cooler in one end tank, which will be the cold side, I will be using a small gear pump and pumping the tranny oil through, once through it I will be putting 45 deg spray nozzles (not atomizing) which will spray the cool oil onto the side of the gears in the tranny hopefully extracting alot of heat and maximizing tranny life with high HP.

Now the ducting of this radiator will all be FULLY enclosed and will have two vents which will exit out the rear of the car in the MOST low pressure zone of the car. This will create, at speed, a vacuum through the radiator. This will be PULLING air out from under the car, thus adding downforce to the vehicle. Hopefully I wont really require a massive wing to achieve enough downforce

In addition to this I will be making a full underbody tray, and the exhaust will not be routed under the car. As much as I dont like the look, it will be run down the side of the car. But with the location of the turbos I will be able to go through the frame and exit behind the front tires. It will then be right below the door. I will be fully shrowding it and all that one will see is going to be the small exit of the pipe just before the rear tire.

FUSE69

The design of the 928 to me looks like it's quite well suited to a rear mount radiator....

Though I wonder if you have left yourself alot of ducting work to do.... perhaps the fuel cell and radiator would be best swapped around allowing the hatch to seal down onto a reasonable sized encolsure as in the below pictures...?





As reference, this is from a Norwegian built WRC Ford Escort Cosworth Built by Stian Hafsengen (Just incase you'd like to try and find some better reference material) .... with approx 550Hp at all four wheels.....



All the best!

belgiumbarry

will you helping the air flow with fans to ? or just relay on over,underpressure ?

123quattro

The only two things that really come to mind with your radiator placement are:

1. I hope you don't pop a coolant hose. 230F coolant sprayed all over the interior can be quite nasty.
2. That thing is going to cook you.

Best of luck. I'm looking forward to seeing what sorts of numbers you get on the dyno.