hacker-pschorr

Shane, at Road America with Speed Seekers it's 4 - 20 minute sessions per day for 2 days. I think my class was averaging about 5-6 laps.

John Veninger

25- 35 min. sprint races.
Then there is the 90min enduro!

Shane

Ok thats doable! Will actually be quite fun!! What kind of data would you be looking for other than coolant and oil temps?

Carl Fausett

I've been racing my SC car for 3 years now without problems - with one acception - in 2001 when I sent my intercooler out to modified mid-season and it did not come back in time for the next race.

I was in the points hunt for the season championship so I stubbornly decided to race anyway without the intercooler. It was a hot, hot August day. Broke a piston land from detonation. It was a stock 1978 Mahle cast piston. My fault.


Heinrich brings up a good point - when I supercharged my 928 track car, they gave me points for the SC and more points for the intercooler - it moved my up to Class A (unlimited) Modified - and now here I am with my little 4.5 L surrounded by Modified Z-06's, and Vipers and the like. The wins do not come easy like they once did.

CMW

Carl is that the one you broke the same day Lag raced the sport bike?

Isn't Tom racing one of his as well, he has more than one SC'ed car, unless he never got the others on.

I can vouch for the flat torque HP curve on both Andy's car and Spigels. The dyno reflects what you feel. The twin screw is not turbo like. Does the Vortech unit feel like that at 3000RPM? Not that that is a bad thing. Thats what makes these fun.

Andy has raced the twin screw in at least one racing event... his only goal, was to break the engine.
He won his class I believe. He told me the monitors or whatever that were at the track said his car scared them as it built up speed. I think a 3500LB missle would scare the crap out of me too.

Maybe we should start a new SC 928 post that will post only the best facts possible, no comments just good data. Dynos are awsome, drag times are awsome, track events, hell even passed smog slips.

I am a big bad *** Marine but there is someone out there not even a Marine who is bigger and badder than me, guaranteed. So lets celebrate the biggiest and baddest among us. Boasts are awsome, so is humility, we should Honor the achievements that we successfully do. Tha is why we look up to people like Mark Anderson and JKC. Just because I prefer the twin screw positive decplacement supercharger does not me that I cannot laude, encourage, and commend the efforts of Tim and Carl.

Stan.Shaw@Excell.Net

Hi Shane,

Thanks, the information JV provided is correct. Running the car for 20-30 minute sessions as hard as possible followed by a 90-120 minute wait, then repeat. Four sessions in one day is what we normally run.

When I am on the track, I am usually on the brakes or on the throttle all the time, so the rpms don't drop below 4k much, if at all, during a track session.

Temperature readings on coolant and oil would be useful. While I certainly don't want you to damage you motor, knowing whether the car will stay cool enough with your bumper close to the car in front of you is important as well.

Also, if you can advise the boost level you are running at, and whether the hp at the level is known.

I appreciate any information you can provide, thanks!


Hi Carl,

I would be interested in your information, but I don't see myself as going with a 16v setup unless you (or someone else) can convince me otherwise. I think with the variety of parts I have (and therefore options) a 32v motor is the right direction for me.

Hi Chris,

If you are referring to Tom F., I think he has been redeveloping the Tilo car since purchasing it. I believe I heard he expects to be at VIR this month.

Stan.Shaw@Excell.Net

Also, has anyone supercharged a 104mm bored motor (no sleeves) without stroking it?

shaaark89

hi stan,
yes the tilo car is a work in progress. i can tell you though that it has seen 18 track days (de) since i bought it in october of last year. only minor issues so far (like intake boots blowing off under boost which has been solved.)
before i started changing it, the oil temp consistently ran around 220 and the coolant around 210. as it sits now, the oil runs in the 230 range and coolant at 215. it will easily run 3 to 4 sessions per day of relatively aggressive driving. this is with 7 psi of boost.

Stan.Shaw@Excell.Net

Tom,

Thanks for the feedback. Do you know how your setup would compare to any of the kits out there? Of course your motor is uncommon if not unique as well (stroked not bored).

Out of curiousity have you ever taken a lap time at Summit Point, VIR or Watkins Glen? I am wondering how they would compare to the PCA club race lap times.

shaaark89

stan,
my car runs a vortech v-1 s trim which is the same as what f.a.s.t. and tim murphy uses. from there on it's unique. spearco air to air intercooler, upgraded fuel pump, 65 lb injectors and aftermarket engine management. at 7 psi i think any of the kits would prove to be pretty reliable and minimally taxing on the motor.
as far as lap times, my best at vir is in the 2:09 range, summit point 1:24, haven't been to the glen with it yet. these can be much faster with a driver who is more comfortable with the limits of the car (i am not as of yet.) i'm sure i leave 5 seconds on the table at vir and summit i have yet to master.

John..

I do think the lb. per lb. comparison is totally valid. Who wants to donate an S4 for me to play with? I assembled the Goldmember's engine this weekend and the manifolds are out for fixturing right now. I am considering just selling the manifolds for those who want to tinker themselves....guys those are the hardest part to make...and unless your wife will let you spend 4+ weekends in the garage it would be best to buy them from me! Had to get that self-promotion part in.

Personally, I do think the "rubber meets the road" is the best comparison. I'm not crazy about the dyno myself and a peak HP number is the last reason to make a selection. Busting out of a corner or climing a hill is all about mid range torque. If you can have mid range torque and top end HP you have it all....the reason I love the turbos...I have my cake and eat it too! Z, don't bother because I don't care.

Marc, I figured that was in the range for a hardware cost for the CS and at that I think your number is conservative. I think Carl's price is reasonable and I find Tim's very high as the hardware is about the same. No profit, I don't think so....

Turbos, heat and valves...bla bla bla. Show me any engine mod like this that doesn't put additional heat load into all the components and I'll show you a bull****ter.

Just to make you all happy I'll dynojet strap GM down upon completion.

Stan.Shaw@Excell.Net

65lb injectors, wow!

Good times, particularly if you think there is that much time left on the table.

That is great information, thanks.

GoRideSno

I wish I could type faster.


Z,
If I had a brother I would want him to be just like you.

That's a really good question. They sure seem to have a lot in common.
There are two others that match their qualities as well. SRV (banned) and Dr Wolfgang.
What do they all have in common?
1) From Wisconsin.
2) Showed up right around the time Tim started marketing his kits (as did Tim).
3) Slam virtually every engine configuration besides the CS.
4) Slam virtually every vendor of 928 performance products besides Tim/Carl.
5) Use only fake names.
6) Almost exclusively show up on threads about supercharging.

Two of these "people" have supplied false information that has significantly and poorly effected the attitudes of rennlisters in general and/or torards supercharging.

Andy K

Jim_H

I sure don't know how anyone could knock your kit Andy. I have seen one ear to ear smile from your kit and heard of many other permanent smiles that don't go away. Me thinks the differences aren't too big between the kits for all the back and forth going on. I know I can't wait to get mine installed and have one of those permanent smiles plastered on my ugly mug.

Jim bailey - 928 International

Back to the original question ; This is an interesting comment ....Marc..devek quote re stroker engines "They have increased ecomomy(SIC)...better mpg/....." . O K so a bigger engine 400 cubic inch versus 300 cubic inch touring at 75 mph same RPM as before is going to get better gas mileage ? That would be nice ....