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Bullet - Supermiata S1 conversion

 
Old 05-03-2017, 05:52 PM
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Default Bullet - Supermiata S1 conversion

While were are building Vegas, our ground up S1 car, we bought a friends S2 "Bullet" build to race. Vegas has been taking much longer to get built than originally planned so we decided to convert Bullet into and S1. I thought it would be a useful build thread since it's taking a
dialed, race winning S2 into S1. We're trying to keep costs down on Bullet since it will be sold as soon as Vegas is ready. Vegas has its own build thread here and is more complex project with lots of proprietary bits and fabrication.

It has a forged NB1 NASA "points" engine which will get a BP5A intake cam, SPM damper and 36T trigger wheel
It will get a 100 series, 50 row Setrab with -10 lines and Mocal tstat. The 100 series is narrow with short rows, I/O right next to each other. This style has less pressure drop than a cooler with fewer, wider rows. Packaging also easier with I/O right next to each other.
1/2" birch ply splitter
We'll cut the lower half of the bumper off to make rad ducting simpler, all covered by the air dam
20# Bosch battery in trunk gets repkaced by a 3 lb Shorai in the pax floor
OEM Sport front and NA8 rear brakes will initially be replaced by Stoptech 11" front. We're working on a Superlite Radial with 12x1" rotor front kit that it might get before the car is sold.
Supermiata 1.6 Sport Clutch/flywheel replaced with RaceTwin organic clutch
Racing Beat exhaust replaced with mandrel bent 3" system, Flowmaster 50 series muffler and resonator
Trunk hing & latch being yanked and replaced with pins
OEM trunk bracing being gutted to save some weight.
Singular 5 vent OEM hood

What is Supermiata? Maxxis Supermiata Cup Supermiata wheel to wheel racing series

What is S2? Supermiata S2 ? General Rules & Regulations Maxxis Supermiata Cup
2300#
140whp
air dam and duck tail
5 speed
225/45/15 Maxxis RC1 on 15x9

What is S1? S1 Rules Maxxis Supermiata Cup
2300#
220whp turbo
4" splitter and big 2D wing
6 speed
245/40/15 Maxxis RC1 on 15x10

Bullet as it was raced two weeks ago.


Borrowed Sonny's GT250 foil to get our mounts set up.

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Old 05-03-2017, 07:06 PM
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Are Stoptechs gonna be legal in SPM then?
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Old 05-03-2017, 07:08 PM
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Originally Posted by d k View Post
Are Stoptechs gonna be legal in SPM then?
Forgot about that. Nope. We'll stick the current radial mount Dynapro 4 11.75 SPM kit on it for the time being.
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Old 05-03-2017, 11:30 PM
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Clean.....Look forward to watching the build develop.
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Old 05-04-2017, 01:37 PM
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Gutting the trunk. I forgot the before after weights but it's something like 14lbs / 6 lbs. Once its done the skin is a bit floppy. Suitable for pinning, not hinges. Hinges are also really heavy, 3lbs or so IIRC.
Latch goes bye bye too. Skin will have slots for wing struts.

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Old 05-04-2017, 02:26 PM
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Originally Posted by emilio700 View Post
Gutting the trunk. I forgot the before after weights but it's something like 14lbs / 6 lbs. Once its done the skin is a bit floppy. Suitable for pinning, not hinges. Hinges are also really heavy, 3lbs or so IIRC.
Latch goes bye bye too. Skin will have slots for wing struts.
Little close for comfort with that bare leg and the cutoff wheel!
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Old 05-04-2017, 02:32 PM
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Removed bit 5.7 lbs


Skin after cut, 8.3 lbs


Mounts were Crushers old rear bumper mounts. Flipped 90°, a few extra holes drilled, little lateral braces added and voila. As an extra bracing measure, we slotted the trunk lid opening a half inch or so and ran the upright through there.

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Old 05-04-2017, 04:38 PM
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Old 05-09-2017, 06:06 PM
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Old 05-09-2017, 08:00 PM
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dual purpose.

i dig it.
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Old 05-09-2017, 08:08 PM
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wait, do Gen2 Xida have remote adjuster option?
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Old 05-09-2017, 09:04 PM
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Originally Posted by psyber_0ptix View Post
wait, do Gen2 Xida have remote adjuster option?
Don't feel bad, apparently these have been available for a while, lol. (I found out from the facebook video)

Though I distinctly remember inquiring prior to my purchase last year, and no bueno.

glad to know they are available
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Old 05-09-2017, 11:34 PM
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I thought I read somewhere that that was only for gen1. Guess I gotta do some more digging
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Old 05-10-2017, 12:25 PM
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Default Air dam & splitter

Some pics of Bullets S1 air dam and splitter work in progress. To accommodate the extra tire width, we allow the air dam to separate from the body as shown. The resultant gap should be covered but it can not be angled downward like a canard. Just a flat cap or block off plate level with the ground.
We contemplated allowing canards or diveplanes here but thought it would be too difficult to equalize with a simple set of rules. A curve plane generating downforce begins to stretch the abilities of the DIY mechanic. Drivers can build a second airdam & splitter for time attack, ST4 or other classes where you can go further. This car will have just the one front end. Vegas, our new S1 has a whole separate front end with giant splitter and low mount dive planes.

Air dam is .100 HDPE sheet. Allstar from Amazon or Summit Racing. .125 works well too if you find a source. 070 is too thin and flexible.
https://www.allstarperformance.com/product.htm?prod=155


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Old 05-10-2017, 01:11 PM
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What are you guys using for the L brackets?
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Old 05-10-2017, 01:29 PM
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Originally Posted by d k View Post
What are you guys using for the L brackets?
Faeries
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Old 05-12-2017, 07:10 PM
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Interim aero, 15/32" 3 ply birch splitter. On the advice of TC Design, we're going to try 10mm alumalite with cables behind the air dam. He tells is it is so much stiffer than the birch ply that we can cantilever more it out front.

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Old 05-13-2017, 01:56 AM
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Originally Posted by emilio700 View Post
On the advice of TC Design, we're going to try 10mm alumalite with cables behind the air dam. He tells is it is so much stiffer than the birch ply that we can cantilever more it out front.
It is, and you can. MUCH lighter too. But it is much more of a consumable than birch. It'll take minor scrapes on curbs OK but any moderate contact with ground/curb/etc. will shred the very thin layer of aluminum on the underside.
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Old 05-13-2017, 02:35 PM
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At Streets of Willow today
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Old 05-19-2017, 07:03 PM
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We didn't like how much of the 245 was left exposed by the air dam set up so we tried something different. Detached the fender/bumper from the tabs on the tub, cut a few notches in the fender lip to facilitate yanking the front half of the fender out. We got about 1.5". The fender lip starts to buckle and distort so either cut the entire lip off or at least cut a few notches so it can bend in 3D. Shrouds all but about 10mm of the leading edge of the tire but leaves the top and trailing edge more exposed which is ok. We mocked it up with a piece of steel rod but it will get an adjustable turnbuckle riveted to the fender skin. We'll see how it turns out with the new 10mm Alumalite splitter.

Mid hack


Here you can see where we detached the bumper/fender from the mounting bracket on the tub


This am wider
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