[lupo.sk]

Install a standalone EBC with a set of APR R1 valves.

I have a greddy profec EBC and dual APR R1s on my modded 955 TTS, it’s really really good at keeping the boost curve flat AF

[Crumpler]

[hernanca]

Love it - Wunderbar!

[worf]

Roger, Roger!

[Crumpler]

Now.
Let’s pontificate on the experiment results.

With one supercharger the car was in the 5-7 pound boost range.
With two superchargers in parallel the car is in the 5-7 pound boost range.

My only theory is that I have increased air flow but not compression, because it’s the same unit with the same specs on each side of the engine.

To increase compression I would have to put them in series, again guessing.

There does seem to be an increase in the boost curve after 5000 rpm now which was not there before. The original goal was to get another 20 mph faster punch in forth gear for the straight away. Hopefully have accomplished that at least.

[hernanca]

Reminds me of a discussion I had over the weekend with the guy troubleshooting the electrical for our RV. Electricity is mostly foreign to me, and RV's are extra fun because they can have multiple sources (shore/main power, 12v battery(ies), and solar) playing in the same sandbox. He said if they all provide the same voltage (14.something volts with no more than 1 volt difference and probably needs to be much closer than that) then the voltage is said to "float", where none of the power supplying systems is causing a problem to any of the other power supplying system. I found that interesting. Be glad it is not RV electrical you are wrestling with!


(Note the brass/copper vertical strip on the 5 minibreakers (and two below it) starting in the top right. Everything connected to those strips can be providing power!)

[Crumpler]

Well I’m out of fiddle time for the car. Track event next week. The headlight delete looks ok at 10 feet ;)

Interesting to me, now that I’ve researched twin blower data (loose term because it’s all random forum stuff) and why research before you do something right?
Parallel blowers into same plenum get you same boost as a rule. Advantages are boost faster, less heat. Definitely more airflow, probably more HP, but the how much gets murky pretty quickly based on system.
If I had time I would dyno, or try the system in a serial configuration, or buy the bigger SC with the 12 rib set up that BC wants me take off his hands :)

[Crumpler]

DE event this week.
Same car, bottom line.
Ran hotter but I was pushing her harder.
I guess I will look at reconfiguring the blowers in serial now, and complete the arc of insanity.

After that I may have to admit she is a fourty year old car:(

I’m still amazed at the money showing up for these events. Multiple Ferrari’s, GT3 RS, etc.
I was most impressed with the new corvettes.
They now corner as well as they dominate the straight.

[worf]

I’m still amazed at the money showing up for these events. Multiple Ferrari’s, GT3 RS, etc.

Yeah. One reason I stopped doing DEs at Lime Rock (and indeed at any track 1/2-day from NYC bedrooms)…

… some folks would show up with a trailer and a crew for DE.

And then never give a pass by.

[Crumpler]

I’m frankly not a good enough driver to complain, but they put an 75 year old woman in my intermediate group.
I was thinking, ok don’t judge, she’s probably done ringer.
Nope. Erratic and slow, no point by’s. Bad to the point of a danger. No awareness of anything going on around her.
Left her turn signal on for a 20 min session.
Then pulls into my garage bay by mistake and they have to help her get out of the car.
I was pissed.
And she had a fucking instructor with her. What was he doing?

[Crumpler]

Sequencing the blowers was the key apparently.
First test drive it was obvious. The boost was 8.5 pounds by 3500 rpm. I need to remap the VE and ignition tables before I drive it again.

Obviously one P-1sc was not giving me the output that it should have on paper. Factory specs and pulley math, it should have. I don’t know.

Air temps don’t seem terrible. But i technically don’t have an intercooler in the circuit:(

[Crumpler]

Had to come up with a way to hold the side plenums on, the increased boost was blowing them off.


Also moved the blower intake up under the fender, while it probably should have been from the beginning.

[hernanca]

I like the front bracket, but worry about the top brackets - my buddy that is helping me polish my S3 intake said the Magnesium was pretty soft compared to aluminum. Maybe periodically check to be sure the top holes are not being routed out which could cause leaks. Maybe also measure the outer perimeter to see what might be able to wrap all the way around it (and hold heat)? A bicycle inner tube comes to mind, but I don't know their heat tolerance. If you need an extra S3 intake, I can spare one of mine for shipping costs. Remind me where you are located, in case it is in my travels!

[Crumpler]

Thanks Hernanca.
That’s a very generous offer, I appreciate the gesture. I do have a spare already.
The mag alloy is unforgiving, I agree.
Those are nutcerts with button head bolts to avoid threading into the alloy.
I looked at a lot of different options, including a cradle.
When the side blows off it’s violent, it happened mid session out on the track. I have to come up with a bomb proof option. Hopefully it lasts.

[worf]

I have to come up with a bomb proof option.

With forced induction, the value of the intake resonance tuning of the runners and plenums matters far less.

So… make your own (which is easy for me to write since a) I’m not doing it and b) you like making schtuff from metalz)

Nuke it from Orbit Ripley.

[Crumpler]

I’m reconsidering my life’s journey.
Another lesson learned, you really don’t want to use barbed fittings and clamps, not just an urban myth, I thought oil cooler lines were the exception.

Pop and smoke cloud at 110 mph during DE.
Loss of grip rear tires from oil.
I feel like a flaming asshole for shutting the track down for an hour to clean.
Motor is fine.

[hernanca]

You have stories to tell. Those of us watching or playing it safer, not so much

Lesson learned, indeed! Bet you won't forget that!!

[Crumpler]

Blue.
For cold.
:)

[worf]

Blue.
For cold.

Not to be confused with ‘blew.’

[Crumpler]

Re-routing intake tube in order to use Hacker’s IC.
There’s a fill port location that makes it less clean, but much easier to fill and eliminate air in the circuit.
The only place left for the heat exchanger was drivers side fender behind wheel. I may do a fan or side scoop on it.