[ChicagoTommy]

That would be a **** load of weight reduction. Every 100lbs is a tenth in drag racing. You're better served working on getting the 60' down. Every tenth saved in the 60' is 2 tenths out the back door.

What track are you running? Any idea of the elevation? Density altitude will play a LARGE role in taking 3 tenths off too. Are you running it stock, or with the t/b upgrade?

[Jason@JacFab]

Originally Posted by ChicagoTommy

That would be a **** load of weight reduction. Every 100lbs is a tenth in drag racing. You're better served working on getting the 60' down. Every tenth saved in the 60' is 2 tenths out the back door.

What track are you running? Any idea of the elevation? Density altitude will play a LARGE role in taking 3 tenths off too. Are you running it stock, or with the t/b upgrade?

Most of my weight reduction will be rotational mass (wheels), so I believe each 1lb of rotational mass removed is equal to appx 3-4lbs of static mass is the old rule of thumb? I've read it to be said as high as 9.x lbs, but I don't think that's right?

By changing my wheels I'm guessing I'll shave 50-60lbs of rotational mass (just a guess, I don't know what the stock wheels weigh, but I'm sure they are heavy, plus the run flats probably weigh a ton)... Plus, I'm also going to a tire thats .7" shorter than stock, so that will in essence fudge the gear ratio from 3.27 up to 3.35, that may help a bit also, but probably not a whole lot.

Static weight, I'm guessing I'll be removing about 80lbs of stuff and things, plus about 50lbs less gasoline than I had last time...

So 130lbs of static weight
~60lbs rotational mass x 4lb == 180lbs static (theoretically)
180+130= appx 310 lbs of static weight removed... 3 tenths quicker.

The rotational conversion is of course theoretical... But, I'll be weighing everything as I remove it from the car, and we'll see what she will really do on Saturday (weather permitting, of course)

Track, Champion Raceway in White City, OR elev. 1410... Should be good DA on sat. I'll be running with the stock TB.

[ChicagoTommy]

Originally Posted by Jason@JacFab

Most of my weight reduction will be rotational mass (wheels), so I believe each 1lb of rotational mass removed is equal to appx 3-4lbs of static mass is the old rule of thumb? I've read it to be said as high as 9.x lbs, but I don't think that's right?

By changing my wheels I'm guessing I'll shave 50-60lbs of rotational mass (just a guess, I don't know what the stock wheels weigh, but I'm sure they are heavy, plus the run flats probably weigh a ton)... Plus, I'm also going to a tire thats .7" shorter than stock, so that will in essence fudge the gear ratio from 3.27 up to 3.35, that may help a bit also, but probably not a whole lot.

Static weight, I'm guessing I'll be removing about 80lbs of stuff and things, plus about 50lbs less gasoline than I had last time...

So 130lbs of static weight
~60lbs rotational mass x 4lb == 180lbs static (theoretically)
180+130= appx 310 lbs of static weight removed... 3 tenths quicker.

The rotational conversion is of course theoretical... But, I'll be weighing everything as I remove it from the car, and we'll see what she will really do on Saturday (weather permitting, of course)

Track, Champion Raceway in White City, OR elev. 1410... Should be good DA on sat. I'll be running with the stock TB.

I've never had the rotational bull ever work out that way. But 190lbs is pretty damned good if you can get it that far, 80lbs of stuff and things is probably optimistic unless you went with a trunk full of crap last time.

Your altitude sucks. That is about the same as Las Vegas Motor Speedway, and I never ran bests there ever. Using the NOAA density altitude calculator, it looks like the DA should be around 1467ft on Saturday, which is about the best you can expect at altitude.

I've gotta start watching for a negative DA here. I'm only around 730ft, and we get some good negative days in fall. I've been 14.0x at around 1000ft DA, so mustering up a 13.something should be possible.

Dammit, I just looked and my nearest track is at -852ft DA!!!! If I could make it there, and cool the car off before closing, I'd go, but that's doubtful as I'm 50 mins away, they close at 9pm, and it would cost $45.

[Jason@JacFab]

Just a pointless update. I have taken the compressor housing to a local special effects company to be 3D scanned. This way I have a perfect model to work off of for the cnc cam and can build a perfect fixture (the first time) for the mill. Hurry up and wait...


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[Jason@JacFab]

Took a month of Sundays, but I finally picked up the turbine housing today and now have a pretty good 3d model... I can finally get back to work on this project...

[Captslow]

Awesome project very interested in your developments

[wookwook]

Well?

[Evil-Bee-NH]

*crickets*

[Jason@JacFab]

Originally Posted by wookwook

Well?

Originally Posted by Evil-Bee-NH

*crickets*

We may pick up the project again at some point, too many other irons in the fire at the moment, and there are already several big wheel options available at the moment. Hell even ZZP jumped on the band wagon.