Lagavulin

Randy, you do have a valid point, and I am by no means trying to minimize it. With that said however, it is important to keep in mind the original scope of the project:

..And ANYONE can do this who has a healthy engine, and some mechanical aptitude.

Tim did achieve his goal, and to the tune of 492 confirmed rwhp. To be honest, we were not expecting the numbers to be this high; it just goes to show how good of a grasp Tim has on supercharging 928’s.

My original intent though, was to share our disappointment as well as how elated we are with everything else. The FMU episode is a part of our weekend experience, and thus gives a more complete picture of what we went through, so that others can learn from it.

After the first run numbers came up, we were ecstatic to say the least! It was only at that moment in time, dyno sheet in hand, when we able to see how the air/fuel was behaving. We quickly consulted the Vortech documentation and noticed a boost/fuel-curve configuration that seemed ideal for what we perceived as happening. Visions of breaking 500 rwhp raced quickly through our heads as we searched and measured the available discs. You should have seen our disappointment after calling Vortech who confirmed that the disc was indeed missing. Rats!

It may sound petty to complain about such a small thing in light of the overall experience, but it just goes to show that no matter how spectacular the results, there is ALWAYS room for improvement,

With this new-found wisdom, ‘just wait till next time!’, and the iterative process will start anew.

Thom1

What does it cost?
<img border="0" alt="[burnout]" title="" src="graemlins/burnout.gif" />

John..

So what does the ignition curve look like for the S4 cars, i.e. what is the max advance? For my car is is about 30 degrees max advance, and I will be turning that back to 22 degrees on boost.

bcdavis

Congratulations!

I feel a lot of joy, knowing there are more and more 928s out there impressing people with their immense SC power! The 928 is such a cool car! Go get 'em boys! (And girls) Bwwwaaaaaaaaaaaaaaaaaaaaaahhhhhhhh!!!!!!

Seth W

Job well done.

Now to benchmark and record the installation procedures and get an authorized west coast dealer and. . .

Tim Murphy

I have 70+ digital pictures that I took during the installation to make a manual with. This will take a little time to put together but it should be very clear for anyone to follow, including a shop that would be doing it for the first time. The plan is to make the manual in chapters so that at the end of each chapter you would be able to drive the car until you had the time to complete the next chapter. The chapters will not necessarily have to be sequential either; you can pick and chose what you want to do next. This will make it very easy to tackle the job by taking it in little steps. Alternatively, you can make it a marathon weekend like the one we did with Lag's car. We could have done it in a shorter time but I was still doing some development work with the layout and that took some time with additional fabricating. The kits would already have that all done and would be a bolt in place type situation.

</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by Seth W:
<strong>Job well done.

Now to benchmark and record the installation procedures and get an authorized west coast dealer and. . .</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">

BC

Tim - Good stuff. Glad to see it all is there.

How do you feel about cogs for the drive mechanism? I don't believe you are currently doing that, nor plan to. I remember you mentioned something about WANTING some slip?

Air to Water intercoolers - What do you suggest? Does your design implement some sort of water circulation system?

I was thinking of a tank at the back of the car with a radiator in a front wheel well, circulating water wetter and water. Then at certain times, you can spray C-02 or similar onto the coils, thereby cooling the water to BELOW ambient - WAY below - Cooling the water to freezing (but it won't because of the coolant level). That would super cool the water going through the intercooler, and that would be very fun indeed.

Another idea the 996TT guys have is a supercooled BULB in the intake tract, JUST before the throttle body. It is also cooled by C02 or similar, to 250deg BELOW 0.

This dense air, with the correct spark and fuel mapping could get 650 at least, out of 10lbs of boost. Remember that we are talking about the air entering the combustion chamber at BELOW ambient.

Anyway - good stuff. Woudn't mind talking to you when I pass through GB in Early August. Maybe get a ride in the rocket sled.

Lagavulin

Pictures as promised; thanks Z!

Engine bay 'complete'. Supercharger's pipe, and connectors will be replaced as they did not arrive in time. Believe it or not, it looks even better in person.





Who is that working on my instrument pod??



Supercharged and heading out to the dyno. Note the instrument pod on the driver's left; it is the perfect location for viewing, especially compared to the more common ashtray mounted units. The car accelerates so fiercely, it's not a good idea to have to look down and view one's boost or air/fuel; all it takes is a glance in this location.



Too bad it rained on the way to Jim Page's shop on Saturday, otherwise it would have looked better, especially the wheels. :-(



The moment of truth, power-wise. After it was all said and done, the dyno operator who has a Viper GTS, while looking at both Tim's and my car, said that he will not be challenging any dark colored 928's from now on. Pretty cool sounding coming from a Viper owner!

bcdavis

AWESOME!

Z

I'll take the liberty of answering on Tim's behalf. His wife seemed very understanding about all the car stuff, but there's got to be a limit somewhere. He was still married when I left there the other day, and I'm assuming he'd like to keep it that way.

The S4 is 10 degrees at idle and low RPM, and then jumps up to 30 degrees. The change to 30 degrees happens at around 3,000-3,500 RPM or so. As previously stated, the above car's ignition and timing is stock, and the car runs the same premium unleaded pump gas that the owner was using before.

Tim talked to Vortech and was told that the cog systems are harder on the internal gears of the supercharger. Unless someone's intending to run a lot more boost, there's no need for cogs. So far the current system has seen up to 14psi of boost without problems.

Yes, the coolant is circulated by a pump from the reservoir to a radiator, from there to the intercooler, and back to the reservoir. A method to lower the temperature of the coolant to below ambient has been discussed already. The generally accepted figure is that roughly every 10 degree drop in intake temperature is worth about 1% more horsepower. The the current intercooler system is very efficient, so it may not really be worth the added complexity that the other system might provide compared to the current one. The above car was driven hard and also dynoed with the ambient air temperature above 80 degrees, and the intercooler stayed cool.

Jadz928

This is an excellent development... way to go guys!
If you are looking for a 16V test subject, I'm very interested.
I'm just on the other side of the lake.
My engine is a hard-charger, ready to be a supercharger. <img border="0" alt="[thumbsup]" title="" src="graemlins/bigok.gif" />
Let me know...

GoRideSno

Tim, Lagavulin, Z,
Excellent job! This is just what the 928 community needs.

A few questions for you guys.

What are you using as a radiator for your IC, where did you get it, and where is it placed?

Did you delete the stock FPR?

Lagavulin, I am adding you to the Boostards list post.

Again, Great Job!
Andy K

Z

That's actually different between the two cars. Tim's is a motorcycle radiator and fan. The one in Lagavulin's car is I believe an oil cooler of some kind that Tim found would work and fit well. At this point I think that's what will continue to be what's used in the future. It's located in front of the radiator.



Yes.



The above are pictures of the installed components. They'll probably end up in the manual, along with more detailed photos showing how the parts actually got installed.

Carlos

Come on guys, this is the first blower install I've been impressed with. How much?

Lagavulin

Tim is trying to keep the kit right around $8k.

If you compare that price to the mass produced C5 kit from Vortech, $7.5k, one can quickly see that it is quite the bargain given that the 928 is a no-volume niche car.

That Carlos is always a no-fluff kind of guy, isn't he? I appreciate that.