I've only run on a big track (Buttonwillow and California Speedway Roval) a couple times with my Vortech S-trim. The only negative I can say was that with my old combo (302 with 9:1, E303, AFR 165 and 10-12 psi boost without an intercooler) is that I had to run on my pump gas tune (436rwhp/380rwtq) and straight VP110 to keep the engine from detonating. That was with total timing of just 17*. However, as long as I ran the VP110 I had no other issues and the car ran great.

 

Good to hear. Did you have a cogged belt, or serpentine?

 

I have the stock serpentine pulleys that came with the kit.

 

Darius Rudis runs a Vortech on track with a seprentine belt I believe. He has a website noting modifications.

 

LOTS of photos: Website Template

It does "ok" hanging with some race-prepped Vipers on track too...

I ran an S-trim for YEARS, without issues.
(sure there is some heat, and lose hp when engine gets warm... just tune for it and deal with slight loss from peak dyno numbers)

Turbo for roadrace is VERY expensive, and heat will glow red-hot, and headers (not cast exhasut manifolds) wont handle heat at WOT for back straight stuff... Thats IMOHO, and been told that too, thus wont build turbo.

(Shhhh 427cid T-trim going in for 2014 season, but dont tell anyone).

 

LOTS of photos: Website Template

It does "ok" hanging with some race-prepped Vipers on track too... 2009 09 19 SCMC GingerMan Darius Vipers - YouTube

I ran an S-trim for YEARS, without issues.
(sure there is some heat, and lose hp when engine gets warm... just tune for it and deal with slight loss from peak dyno numbers)

Turbo for roadrace is VERY expensive, and heat will glow red-hot, and headers (not cast exhasut manifolds) wont handle heat at WOT for back straight stuff... Thats IMOHO, and been told that too, thus wont build turbo.

(Shhhh 427cid T-trim going in for 2014 season, but dont tell anyone).

Thanks for posting. I loved that video! I read about the heat from the turbos, and also that some were using the screw type superchargers on the track.

I also read the debate on the liner boost of the centrifugal vs the screw type, and what I didn't see what anyone talking about using a different pulley on the centrifugal to get the boost in a bit sooner.

I was thinking that the centrifugal units would run a bit cooler than an engine mounted screw type [even with the air water cooler under the supercharger], as they are mounted away from the engine. Also, it looks like it wouldn't be hard to fab up a cooling duct from the front somewhere was well as cutting a hole in the hood right above the head unit.

In my thinking a bigger displacement engine like mine [427cid], wouldn't loose to much torque as the displacement of the engine would take car of that. The blower would really just add an extra bit of power when needed in my application.

Any secrets/tips that you can tell us for running, and tuning a centrifugal on a track car?

 

My girlfriends uncle has a 4.6 with a Vortec S trim, runs around 12-14lbs of boost. No over heating issues, runs 190-205* all day.
Cooling mods are a lower degree thermostat (not sure what degree), A 3 core radiator, Vortec After-cooler setup w/front mount heat exchanger, Cylinder head cooling mod. We will be adding an oil cooler to the mix and possibly an electric water pump this winter.
The track tune dials back the HP a little bit and runs a little rich to keep everything in check. But it is still a bit over 500rwhp with the track tune on.

I like driving the car because I can roll on the throttle a little quicker than I can with twin screw cars I've driven. The boost from a Centrifugal is gradual so it doesn't shock the rear end as much when you really get on the gas after an apex. However you do need to try and keep the RPMs up to stay in your powerband, so we run a 4.10 gear. We are swapping out this year to a 3.73 and seeing how it turns out.

However if it were up to me I always suggest running N/A with track cars.

 

Your right about using an oil cooler for the SC. I'm going to plumb one on my setup to run to the side scoops for air.

 

Building a 369 with a Novi 2000. Aftercooled. Glad to see that it is ok and I am not the only one. I am going to use the 1993/95 Cobra R front mount oil cooler as well as a thermo controlled oil valve made by russell I think. It should open at 180 degree's I think, something like that.

One day I plan to swap the 427 dry sump NOS motor from my drag car into this then build an all aluminum 600ci NA motor for the drag car. I say put the 427 in it with a blower, both of you guys. I would if I could fit one on the front of the engine.

 

I've seen a lot of bad things happen to turbo cars on the track. When that boost kicks in the rear kicks out. I've been thinking of super charging my car but don't want to lose reliability.

 

From all that I have read, and know, a centrifugal supercharger don't make hp/tq down low in the rpm range so you wouldn't have to worry about boost comming in all a once, like with a roots, or screw type positive displacement SC.

The centrifugal type makes boost as rpms go up, so you wouldn't come into boost unless you were up in the rpms coming out of the corner.

Now, you could make power come in a bit lower by using a different pulley on the SC [talking centrifugal ] to get the boost down lower if that was want you wanted.

What I was going to do, is use the bigger cid of the 427 to have low end tq, then the SC should pull me along on top end..........I hope that makes sense.