Bomb girl, final iteration

[Bonjo2]

I am going to give it another go this year. Goal, be competitive in autocross, track day, standing 1/2 mile, drift, and short track drags without a trailer, changing tires etc... Would love to run solo1/time attack/drift, but a "kit car" and not massed produced production vehicle. this might be my last go, before joining the miata crowd. I spanked a supercharged LS miata on highway but there's nothing I could do to stay with it on the off ramp, or under braking.. I love hitting the cruise rides and car shows.

 

Currently my kite is running 1760lbs at 705Bph per ton (flywheel and no driver). Car is nuts, super easy to handle up to a point. over 100mph wants to kill. Cam comes on, mega lift and wind buffeting though 170mph, (so even 4th gear wheel spin at 90mph) and then even goggles or full face helmet don't work. Anyway, designing new front control arms to lessen the braking wobbles/upper a-arm flex at high speed. second is to beef up the rear end which even after welding tubes and 600bph axles, and a stout 3.08 ring gear, the poor 7.5 flexes and leaks, and doesn't like burning through 315 tires.

 

1. safety, bleck, side impact bars, crossover bar and top, plus reinforcing frame a bit by adding some 20g steel flats and 16g gussets. I got turned down at three open tack days and 1 nascar style "wacky Wednesday" event due to no side nets, side (2?) impact bars, crossover bars, fuel tank not sealed off from driver, battery not sealed off, aluminum firewall and only 2 frame (steel) mounted seat mounts (other 2 are mounted to aluminum skin). one tech guy says I need 3/16 mount plates for a min of 6 point roll cage? WTF? not a mustang. Currently I've only found one shop in MD to do the roll cage mods, but am not sure it worth the hassle as I can get a spec miata roller for about $3500.

 

1. a. lose 40lbs--make up for other weight gain

 

2. aero, full flat bottom through diffuser, front wing, rear wing, windshield, barge boards etc.. not quite full time attack due cost, but no more lift. but doing the math will need 100-150 wheel horsepower to be 170-200mph crazy. (single low boost 6-9psi rear turbo?, or wait a year and up cubic inches)

 

3. Longer... lengthen rear trailing arms and relocate fuel cell to be flat, may have to run a mumford link to clear beefed up 10 bolt housing. New front spindles and a-arms should net more caster, 1 degree more neg camber, and almost 1" forward bite with adjustable ackerman (on or parallel). A 2" longer trailing arm will allow me to go back to the 13" shocks and still clear the frame at full droop. with 15 wheels, and 13" shocks, the axle would hit and I would spin...

 

4. More fuel. Currently 90% cycle on stock injectors and wali pump is stressed, angled tank sucks below 1/4 full. Need to relocate FPR to engine bay with a solid 8 or 10AN feed and 6AN return, with 65-80lb injectors, add a holley 450+ in-tank pump.

 

4. Smaller tires. The most fun I've had in this car was running 15x225 drag radials with 0 tread wear. They lasted only 1k miles but were awesome and sidewalls were suited to a car of our weight. The toyo 100 treadwear tires (and brakes) look brand new after 12K miles, but are rocks until they get hot, and sidewalls made for a 3500lb car, so no telling if no pressure. I will downsize to a 17x9 rim and 235-255 tire as since upping rears to over 300mm the car is an on and off switch and if/when hooking up feels like something is going to break. My best gtech was 1.9 to sixty with 225 drag radials, and now over 2.4 with 315 100 treadwear and very inconsistent. Still able to launch in 2nd or 3rd, keep low revs and blast past most cars to about 90, then technology takes lead and the GTR, demon, corvette and 911s walk me as I feel like I am bout to take off for flight. The LS3 sounds like a truck motor in non merged form and not cool until 4500-6500RPM which is nuts..not as much fun as a 7 with a screaming Ztec, Duratech, or Honda that can pounce to 6500-9krpm.

 

 

I just wanted to put my plans out there with hopes that 1. someone needs my spare bits, 2. someone knows a shop that can do roll cage near Hampton VA. and 3. someone might have some experience with making a polycarbonate windshield.

 

all the best.

[Bonjo2]

mm

[Bonjo2]

170

[sf4018]

I'm a gung-ho kinda guy but that sounds terrifying!

[xcarguy]

170

 

OK, Kevin, I have to ask....is the lawnmower your Bomb girl tow vehicle?:jester:

 

Sounds like you’ll be upping the bar just a tad. This will be interesting to follow.:seeya:

[Bonjo2]

Yeah. Lawnmower is my Seb Ferrari tribute, same wing as your car.

 

You might want to itemize and part out your car. I’ve been debating it. Found an FD and a FB rx7 shells... thinking having a windshield would be so cool.

[xcarguy]

Yeah. Lawnmower is my Seb Ferrari tribute, same wing as your car.

 

You might want to itemize and part out your car. I’ve been debating it. Found an FD and a FB rx7 shells... thinking having a windshield would be so cool.

 

With that much down force on front, I suspect one pass is all you neeed for a nice, even cutting.

[Croc]

Car is nuts, super easy to handle up to a point. over 100mph wants to kill.

 

 

I find that to be an intriguing selling point in a car especially when considered with your later comment...

 

 

 

....but doing the math will need 100-150 wheel horsepower to be 170-200mph crazy.

 

 

In a car that wants to kill you over 100mph, you are contemplating another 100-150whp? You sir have a big brassy set hanging there to even contemplate adding more hp. I think I want to meet you in person and have a few beers - I like your style!