October 22, 2019, 03:09:07 PM

Author Topic: Texas Mile October 18-20 2019  (Read 870 times)

Offline gunpilot

Texas Mile October 18-20 2019
« on: August 21, 2019, 08:41:20 AM »
Ill be out there running again.  I'm currently working on getting all the issues I had last time corrected. 

To recap - had my front stock harmonic balancer spin off - upgraded to ATI super damper.  This should absorb the torque associated with the car.  I also plan on adding a key to the crank to pin it from spinning.

I built the car to go over 200 in the top of 5th, but that did not happen.  I hit the rev limiter (set at 6800) about 30-40 yards short at the top of 5th and did not have time to shift to 6th.  With the fuel cutting off short of the speed trap, I registered a 196.  I'm pretty sure I was going over 200 before my fuel cut off.  I raised the limiter to 7000 and plan on only using it at the top of 5th to get those extra 30-40 yards.

My aero seemed off.  Car was drifting right and left 3-4 feet at high speeds.  Felt a bit uncomfortable.  :o  I have been, and am continuing to work on underbody aero and a drag wing.  Mid section of the underbody is done and I still need to work under the engine bay, and a rear diffuser.  I tape off most of the lines and air gaps on the car, and with the under body panels I will need a place for air to escape the engine compartment after it goes thru intercooler and radiator.  I don't want to cut holes in the hood, so I plan on adding 1in spacers to the hood latches to raise it up in the rear.  This should give a large enough gap between the hood and windshield to let air escape.

For the drag wing, I have been looking at many designs and am fabricating something that follows the rear trunk and still allows me to open it if needed.  Ill have to put lots of holes in the trunk lid and bumper, but those can be plugged later.

Pictures to follow.
1993 RX-7 LS6 Swap
Future Turbo
Future 8.8
"Texas Mile Here I Come!"

Offline Venom13132

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Re: Texas Mile October 18-20 2019
« Reply #1 on: August 21, 2019, 11:50:03 AM »
that's pretty crazy.  Put a gopro in that thing while your going!
1995 RX-7 - LS1, T56: LS6 Intake, Feed wide body, Feed CF Side skirts, Ray's Gram Lights, K-Sport coilovers, 99 spec\ tails and spoiler, SpeedHut Gauges, Aeromotive fuel pump, TwinZ Rear Diffuser
2000 Ford Excursion - V10 Tow monster
2006 BMW 650i - 4.8l V8 6-Speed Manual - Daily Driver

Offline digitalsolo

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Re: Texas Mile October 18-20 2019
« Reply #2 on: August 22, 2019, 07:43:59 PM »
GoPro for sure!
Blake MF'ing McBride
1988 Mazda RX7 - Turbo LS1/T56/ProEFI/8.8/Not Slow...   sold.
1965 Mustang Coupe - TT Coyote, TR6060, modern brakes/suspension...  project car
2016 BMW 428i xDrive Gran Coupe - Completely stock...ish

Offline kinger

Re: Texas Mile October 18-20 2019
« Reply #3 on: September 09, 2019, 06:00:06 PM »
Whoa!  That has to be a crazy ride!  My STi did 160mph and felt like 90 it was insane stable.  The 7 scares the wee out of me at 140mph.  Its not a high speed racer at all with the twitchy bump steer spacing and poor aero (my car specifically 99 spec front, no spoiler, lots of gaps for cooling but not good for aero). 

Raising the hood 1" at the hinges sounds genius! 

Be safe!
93 Touring, 6.3L, T56 Magnum, Mamo RPS BC2 clutch, FAST 90, NW 90TB TB, 8.8, samberg everything, AC, PS, TC, Cruise, LED Tails, HID head lights

Online shainiac

Re: Texas Mile October 18-20 2019
« Reply #4 on: September 09, 2019, 10:22:30 PM »
Unfortunately raising the hood at the rear will do the opposite of what you want. Where the hood meets the windshield is a high pressure zone like the front of the bumper. The spacers work well for stuff like drifting or autocross where it's low speed and you really just want ventilation while the car is parked. There's a good illustration from Mazda showing the high/low pressure zones of the FC that gets the point across. The best place for a vent is the zone right behind the headlights.
'88 TII -  SBE 5.3L, Twin EFR 6758s, T56 Magnum, Ronin 8.8" IRS, MS3Pro Ultimate
716whp/662wtq @1.3bar

Online shainiac

Re: Texas Mile October 18-20 2019
« Reply #5 on: September 10, 2019, 07:51:53 AM »
I found the diagram I was talking about. I know you have an FD and not an FC, but I'd think the general rule still applies. It's the same reason cowl induction hoods work.



'88 TII -  SBE 5.3L, Twin EFR 6758s, T56 Magnum, Ronin 8.8" IRS, MS3Pro Ultimate
716whp/662wtq @1.3bar

Offline Supe

Re: Texas Mile October 18-20 2019
« Reply #6 on: September 10, 2019, 09:21:28 AM »
^^^ Yep

Offline gunpilot

Re: Texas Mile October 18-20 2019
« Reply #7 on: September 19, 2019, 02:04:50 PM »
Nothing like a race in 3 weeks and having the entire drivetrain removed!!!!!  Hoping the motor will be finished next week so I can install it, re-plumb the turbo, break it in, and tune.  YIKES!!!!!
1993 RX-7 LS6 Swap
Future Turbo
Future 8.8
"Texas Mile Here I Come!"

Offline gnx7

Re: Texas Mile October 18-20 2019
« Reply #8 on: September 29, 2019, 05:02:02 PM »
Just buy a stock spare hood and put some venting it.  You need venting or you will get front end lift.

What kind of power are you making?  200mph should be a cake walk in 1 mile.   We do that in pretty much 1/2 a mile  :grin:

Take all the aggressive handling alignment out of the car and tell the place what you are doing and you want high speed stability.  I can go 200mph without issues.... it only drifts a little left/right if there is some serious wind.

If you can'd find a hood... I'm sure Steve Kan in TX who does a lot of RX-7's will have one or be able to find you one
https://www.facebook.com/prtperformance/
'93 FD: 441ci/AllPro LS7 heads/intake en route, T56 Mag, 8.8" IRS, HolleyHP, DavisTechTC 10.32@137mph cats/full exhaust. 165mph 1/2 mile (old LS7)
'93 FD LS9 turbo, T56 Mag, Samberg 8.8" solid axle, 9.35@163mph 197mph 1/2 mile
`69 Chevelle: alum 5.3, GTS76 turbo, ChiseledPerf A/W, T56 Magnum,Ford 35 spline 9".CTS-V interior http://www.norotors.com/index.php?topic=18234.0
old yellar....440rwhp/FD sold but not forgotten: http://www.ponycars.net/scc.htm
I sell new T56 Magnums/McLeod clutch/T56 rebuild kits/Holley EFI/FIC injectors and all BrianTooleyRacing parts.  norcalmotorsport@gmail.com

Offline gunpilot

Re: Texas Mile October 18-20 2019
« Reply #9 on: October 01, 2019, 10:34:42 PM »
Well someone broke into my shop and decided they needed my turbo setup more than I did. There is no way to install the motor, get replacement parts,tune, and sort it out before the race. I want to be safe. The next event is in March, and I should be ready then. Stay tuned. I will continue to post in my build thread.
1993 RX-7 LS6 Swap
Future Turbo
Future 8.8
"Texas Mile Here I Come!"

Offline Exidous

Re: Texas Mile October 18-20 2019
« Reply #10 on: October 02, 2019, 03:31:51 PM »
Damn man sorry to hear that. A v8 rx7 turbo kit is so bespoke. I cannot imagine anything outside the turbo being worth anything to them. Dumb dumbs.
94 BB SBE LS1 Full Mamo top, MS3ProU with TC, RONIN 8.8 and another custom dual 2.5" stainless exhaust. Not too loud with the new resonators!