Continued Frame Modifications, Rear Suspension Work

Still working on getting maximum strength, stiffness, and appeal out of the frame.  A partial redesign on the front end substantially increased torsional rigidity, while a few extra tubes were required in the rear to allow an alternative rear coilover mount setup.  (Seats are temporary placeholder models)

Enjoy, its coming along...  Frame construction will be next.

 

Frame Modifications

Continuing work on the Spartan V8 frame.  Working on increasing engine clearance in the front while maintaining or increasing torsional rigidity, simplifying the frame and eliminating redundant tubes, adding front A-arm and coilover pickups, and reviewing and reinforcing rear differential unit mounts.  Also working on better models for the coilover shocks - need to be able to carefully check clearances around them.  Should be ordering the actual coilovers this week, and once they arrive I can double check the final models as well.  Then the coilover pickups can be finalized.

Brake and Clutch Pedals

The original plan was to use the pedal setup from one of the donor cars, a 98-02 Camaro, but it became clear that this was not going to be the best option.  The factory pedals are a flimsy stamped steel affair, with a goofy bracket designed to mount to the Camaro's oddly shaped floor/firewall.  The pedals are also cramped together quite tightly, with the gas pedal hinging on an axis that is not in line with the brake and clutch hinges - it is actually made to swing in closer to the brake pedal as it is depressed, presumably to clear the transmission tunnel.

In place of the factory pedals, I will be using Wilwood style pedals.  To keep things clean and tight, and considering the low seat hight, I've opted to use floor mounted pedal assemblies.  I say "Wilwood style" because there are quite a few pedal manufacturers out there that are all making a similar product - Wilwood, Tilton, CNC/Neal, etc.  I chose to use another manufacturer, Southwest Speed, and I'm pleased thus far with my choice.  The brackets and pedals are cast aluminum and the pivots are hollow steel pins, so they are extremely lightweight.  The separate pedals allow me to space them however I like, and because of the aluminum construction there are a minimum of things to oxidize out in the weather.

Still working on that gas pedal, but leaning towards the flat aluminum kind that hinge from the bottom, popular in street rods and dune buggies.  The three pedal assemblies will then bolt to a common plate, which will bolt to a slide assembly.  This slide will allow for compensating between drivers of differing height, without having to have a movable seat.

LS1 Engine Mount

Starting to finalize the various brackets for the engine, transmission, suspension, etc.  These components will be plasma cut and TIG welded by Matt at Fatty's Chassis, a local speed shop.  Once the remainder of the major components are modeled and have matching brackets modeled, it will be time to start the chassis...

Just a word on Fatty's Chassis, Matt is a guy with a lot of old school hot rod knowledge and experience.  He sells just about anything you might need or want thru his website, but he also does some of the nicest custom fabrication work I've ever seen.  He insists on TIG welding everything.  He runs his own shop, complete with CNC plasma jet machine, so he can make just about anything.  Click on the link below to check out his site or send him a message if you need something in steel/aluminum/stainless fabricated - I know he's the only person who's going to be welding on the Spartan V8.

Exhaust

The exhaust system has been a debate for some time.  Being a longitudinal V8, I have exhaust manifolds on both sides of the engine bay.  On most cars with a similar driveline, these manifolds exit into tubes that follow the transmission into the trans tunnel, and run underneath the driveshaft until they reach the rear of the car.  Here, they go up and over, or even under, the rear axle, into a muffler, and finally the exhaust exits out the tailpipe.  Well, this poses a problem.  The tunnel is tight around the transmission to increase interior room and especially leg room, too tight for exhaust pipes to run next to the transmission.  Under the transmission, or under the car at all might work, except that the current ground clearance is set at 5" - running 2.5" pipes would reduce the clearance to less than 2.5", unacceptable for a street car.  The underside of the car is a perfectly flat undertray, with no place to tuck the exhaust pipes into, without intruding into the passenger compartment.

What then, if the pipes cannot be routed under the car?  Sidepipes are a great option, but have some drawbacks as those familiar with them can attest to, usually referring to the burn scars on their legs.  Heat shields help, but the pipes are still literally running right next to your legs and body as you drive, and are going to be at least somewhat hot.  I was actually thinking about a sport bike when I modeled this muffler/rear fender idea, and mind you it is a bit rough, but gets the point across.  Again, picture a sport bike where the exhaust exits out over the center of the rear tire.

The other thought was to simply shorten the sidepipes - a lot.  For this to work, the round canister muffler would be moved close to the engine, just behind the front wheels.  The muffler would end just before the front corner of the passenger compartment, ending with a rectangular angled tip.

T56 transmission

Well, long story short, the transmission I bought was out of a wrecked car, and turned out to have some serious issues with bent and broken internal parts.  The seller had been open and honest about the transmission thus far, and had even gone so far as to give a written guarantee that it was in great shape for the mileage, and unfortunately I had to take him up on it after hearing back from the trans shop.  I thank him for being a good and honest seller, not everyone would have held up their end of the bargain.  (Thank you Jake)  At this point the trans is back from the shop, rebuilt back to stock specs, and I'll be continuing to measure it and update the 3d model so that the transmission tunnel of the frame can be adjusted.

T56 Transmission

I recently picked up the six speed transmission for the Spartan, which means I can now get a much more accurate model of the transmission into the 3d assembly model of the car.  Once that model is finished, I can mate it to the engine model in the main assembly.  This will allow me to refine the dimensions of the tubes that make up the transmission tunnel in the frame - too much room in the tunnel, and I lose valuable interior space; too little room in the tunnel, and of course the transmission doesn't fit.

I'm still in the process of getting it cleaned up, but will get some pictures up soon.  It also needs to go to the transmission shop for a quick going over to make sure its ready to go.

Coil Brackets

The factory truck spark plug coil mounting brackets and the LS1 intake interfere with each other - the fuel inlet wants to be in the same place that a coil does, so I've made some brackets that slide the coils down and away from the intake.  These use the same factory mounting points as well.  I will be having them cut out of T6 aluminum and test fitted sometime this week.

Test fitted the new bracket on the valve cover, and everything fits perfect - except one hole being a bit off.  Also trial fitted the coils to the bracket and everything fit and cleared perfectly.  I fixed the hole that was off and also added holes for the coil wiring clips, now I'm ready to have two new brackets jetted and installed...  These brackets are also much sturdier and weigh marginally less than the factory brackets.

Two new brackets are made and test fitted successfully, next will be transferring the coils over and fastening them to the brackets, then mounting them back on the motor.

Drivers side coils were mounted to the coil bracket, and installed on the motor.  Looks great, is lightweight, and allows the fuel line to clear the coils with no modifications.  Couldn't be more pleased with the design.  I've had some requests already from folks wanting these coil brackets - you can email me at sbcrx007@yahoo.com or leave a message here if you're interested.

Warning - experimental

Added the logo from an earlier emblem design to the front of the engine cover, as well as "experimental" to the sides.  These would be likely decals cut from heavy gauge vinyl, stuck onto the aluminum or CF "hood".  It strikes me as a little in your face, but I like it.  We'll see what makes it to final production of the prototype.

Wiring, continued..

Customizing the wiring harness took a while longer than anticipated, but I am very pleased with how it has turned out thus far.  Every single whire in the harness has been shortened or lengthened for my application.  My harness looks a bit different than other custom harnesses you may have seen, this is due to the intake being turned around 180 degrees, which moves the MAF, IAC, and TPS connectors to the back of the motor.  Since this was originally a drive by wire motor, the TPS and IAC wiring had to be added.

At this point, it's ready to be taped up the rest of the way and test fitted one last time, then can be loomed up to look nice.  Of course, the wires all still need to be repinned into the blue and green pcm connectors as well.

Electric Version?

I got it in my head a few weeks ago that an electric hybrid version would be fun as well.  Read an article on the e-car that Audi is designing, and was drawn to the amazing torque that is available with electric motors.  That, and the lack of a need for a gearbox, given the electric motor's available rpm range.  Of course, there comes a cost - what drives these high power electric motors?  Batteries?  No thanks.  The obvious solution would be a drivetrain something similar to the Toyota Prius or Honda Insight - small gasoline motor turns a generator, which in turn powers the electric motor, maybe with a small battery thrown in for good measure. 

A 250 ft-lb motor at each wheel, good from 0-10,000 rpm?  They could be geared as well, at 1:4 or higher...  1000 ft-lbs on tap, at all 4 wheels, there's an interesting thought...  And that's evidently just what Audi plans to do.

It isn't in the works and probably won't be for a good while, let alone the budget, but food for thought nonetheless.