Chevette Front Brake Upgrade

As a budget-friendly economy car the Chevette was never outfitted with high dollar parts from the factory in order to keep the price tag low. This includes the brakes, as the factory Chevette brakes are laughable at best. A solid brake disc combined with a brake caliper smaller than my fist would be more suited to a go kart, as we found out when we raced the JDMVette.

Once we discovered the inherent limitations of the factory brakes, we sought to upgrade them. Our solution retains the stock master cylinder, upgrades the front rotors to 11″ vented rotors with the stock 4×100 bolt pattern, and fits on the stock spindle.

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Here is the basic parts list to complete this swap:

– Stock Chevette Brake Rotors
– 1990 VW Corrado G60 Front Brake Rotors
– Wilwood Forged Dynalite Brake Calipers (Part no. 120-6806)
– Wilwood BP-10 Brake Pads (Part no. 150-8850K)
– Brake hose with a 180* fitting on the caliper side (I didn’t order the ones on our car so I don’t know the part number)
– Brake line adapter fittings for hose to caliper
– 6″L x 2″T x ?”W piece of steel bar stock (? explained later on)
– New wheels to clear the brakes (We used 15×8 Bassett wheels with wheel spacers)

The first step in the brake upgrade is to provide a mounting solution for the new rotor. We had a local machine shop cut off the rotor part of the stock hub. Be sure to bring the Corrado rotors with you when this is done as the outer diameter of the cut hub will need to be able to fit within the inner diameter of the brake rotor hat.

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Once the rotor fits on the new hub, the brake caliper bracket can be addressed. Measurement for this bracket is critical. Our best solution for measurement was remove a spindle from the car and put it in a vise. After that, you attach the rotor to the hub and secure it with 4 lug nuts. The brake pads are then installed in the caliper and the caliper is set on the rotor. In order to allow for a small amount of radial play on the rotor, two small (1/8″ or so) washers are placed between the rotor and the two silver fluid bridges of the caliper. Ensure the brake pad will sweep the rotor face at this time too. Once the caliper is in place, measure the distance between the caliper brackets on the spindle and the brake caliper. As this mount is rigid, accurate measurement for the bracket is critical to ensure normal and even brake pad wear.

Use this measurement to purchase the steel flat stock for the bracket. Our finished product ended up like this.

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Once the bracket is complete, the rest of the upgrade is fairly straightforward. Bolt on the caliper, attach the brake hose, bleed the brakes, check wheel/caliper clearance and then bed the brake pads.

A few final notes on this upgrade.

I’m not entirely sure what brake hose was used on our car. The hose we did use has a straight fitting and one adapter to attach to the Wilwood caliper and it clears from lock to lock. If you guys find a better solution, mention it in the comments and I’ll update the article.

I choose the Wilwood Forged Dynalite caliper because it almost exactly matches the piston area of the stock Chevette caliper. I believe it was 2.94 square inches versus the Wilwood at 3.0 square inches. That meant, as far as the stock master cylinder was concerned, almost no change was made. Brake pads are also very cheap and lots of compounds choices exist.

Our wheel choice of the 15×7″ Bassett wheel in the 3.5″ offset isn’t ideal. Our main concern was cost as we were buying 8 wheels for racing when we purchased them. We also bought them prior to the brake upgrade and we had to clearance the fenders quite a bit. They’re not ideal as they’re very heavy at 19 pounds and requiring a sizable wheel spacer to clear the caliper is another negative. I’m sure they’re are better wheels than what we have so don’t take what we have as the final say. We adapted what we already had to fit this brake upgrade. They have been race proven for triple digit speeds for multiple hours, so they’re not an awful way to go either.

Price list:

Wilwood Forged Dynalite Caliper – $125 (Stock – $153)

1990 VW Corrado Brake Rotor – $50 (Stock – $54)

Brake Pads – $42 (Stock – $43)

Road America – April 2012 Trackside Report

We arrived at Road America in Wisconsin today to get our racecar inspected in preparation for the race weekend. Chump Car is hosting a twin 7 hour enduro race for Saturday and Sunday. Things went well and we saw lots of friendly faces in the line for technical/safety inspection. Aside from having to deal with some chilly weather it was a great introduction to a beautiful facility at Road America.

The real treat was seeing a McLaren MP4-12C in the pit area. One friend of another team here picked it up earlier today and drove it to the track. It seemed fitting for a racetrack to be the first destination for a car with that heritage.

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Here’s a quick walk around video I did of this rolling masterpiece.

Project JDMVette: Synopsis

Project JDMVette is complete, running, and race tested but far from over.


Photo courtesy of Chump Car World Series.

Our race team put on a great showing at the Chump Car invitational race at Iowa Speedway. We completed all 25 hours of racing and ended up 19th out of 47 cars after completing over 1,300 laps. Our problems were relatively minor excluding the final hour of the race. The oil cooler in the RF wheel well caught a rock in the final hours of the race. We didn’t have time to protect it with a wire mesh in the last minute scramble to get the car together in time for the race. Simply looping the lines at the motor solved that issue. The motor was also consuming water for some unknown reason, so we had to refill the radiator a couple times in the final hour of the race. We will have to see if the radiator had a pinhole leak or the headgasket went bad and was seeping water into the combustion chamber. The brakes are another area of concern. We are turning way faster laps with the new motor swap and we are exceeding the capability of the stock brakes. The solid front rotors can’t dissipate the heat generated slowing the car from triple digit speeds and become heat soaked in a hurry.

Overall, the car performed extremely well for its first race. An exotic motor swap with zero testing lasting 25 hours in brutal racing conditions is a great building block for a successful racecar in the future.

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JDMVette: Trackside report

This will be a quick and dirty post as I’m currently sitting in the pits at Iowa Speedway in Newton, Iowa for the National Champion ship race.

The JDMVette survived the first day of racing, 12 hours of abuse in all, with only a few minor issues. The weather was horrendous with off and on downpours through out the day. The rain ended up leaking through the lexan windshield directly onto the fuel relay for the ECU. A makeshift repair of a plastic grocery bag taped around the offending part got us back in business. The air filter sticking through the core support was great for getting cold air, it also ended up being great at ingesting water. A duct tape bridge between the bumper and hood was enough to shield the filter and MAS from most of the water.

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Other than those minor issues the car has been solid and has gotten us to 21st place out of 48 cars if I counted correctly. We lost a Tom of ground in the standings because we ran 30 minute sessions for each driver at the beginning of the race instead of the maximum 2 hours. We wanted to ensure every driver had a better chance at driving at least once in case the car blew up in spectacular fashion.

Lastly, I don’t think a Chevette hood was designed with a turbo in mind. The paint was discolored pretty badly after 12 hours of racing.

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The $20 intercooler I overpaid for

The progress on the construction of project JDMVette continues on. We came up with an unorthodox solution to help keep the motor cool while we flog it around a race track for hours on end. We added an intercooler to help cool the hot air the turbo will be pumping out but we didn’t install it in the usual manner or use the usual materials. This car really limits us on space and the type of racing we’re doing really limits our budget. What follows is how we managed to stay within those requirements and help extend the longevity of our motor in the process.

The Chevette chassis really limited our options for intercooler placement. Most cars use a front mount system to ensure maximum cooling capability from a steady supply of fresh air. We wouldn’t have that luxury as there isn’t any room for the intercooler in addition to the radiator. Seeing other cars, such as Subarus, use a top mount system led us to seeing if that would work for us. Luckily, the cowl area was very similar in size to the beat up intercooler core we had. Body mounts were constructed out of 1/2″ steel tubing to position the intercooler where we needed it.

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Once the core was in place, we scavenged the radiator hoses from the drivetrain donor chassis and repurposed them to route the turbocharged air where we needed it.

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It’s not an ideal solution but it’s not a bad result of a $20 intercooler and scavenged parts being thrown together.

Project JDMVette: Taking a page from NASCAR’s book

As our race team continues the mammoth effort of swapping in a Mitsubishi four cylinder motor into a Chevrolet Chevette we decided to follow what NASCAR did recently and convert our carbureted fuel system to fuel injection.

This isn’t as daunting as it sounds. Our car runs a fuel cell, so adding the requirements for fuel injection is far easier than adapting a factory OEM fuel tank. There was one concern though, most fuel injection gas tanks have baffling around the fuel pump pickup to help prevent fuel starvation. Fuel starvation can lead to the engine running lean and causing catastrophic damage. This isn’t an issue for carb engines as the float bowl on the carb itself acts as a miniature reservoir for the fuel supply. We needed to add our own reservoir to prevent any fuel starvation under sustained cornering at the race track. Luckily, many racers have already solved this problem and have come up with a mass market solution called the surge tank. Adding one to our setup took a bit of planning and a couple of shipments from Summit Racing.

Our surge tank would provide the proper reservoir for the fuel injection pump but we need to ensure the tank is full by using a low pressure feeder pump that pulls from the fuel cell.

Once the surge tank has the required fuel, we need to give the fuel injectors the fuel they need at the required pressure they need. To do this we bought an inline EFI fuel pump and mounted a fuel filter between it and the surge tank.


Once we got the high pressure fuel into the fuel rail and fuel injectors, we needed a way to regulate the fuel pressure the motor would see. To accomplish this we mounted a fuel pressure regulator in the engine bay and plumbed it into to the fuel rail. The regulator will also ramp up the fuel pressure as boost rises when we plug in a vacuum reference line from the intake manifold. More boost is more air going into the engine, which needs more fuel to keep the needed air fuel ratio.

The regulator keeps the fuel pressure at the the proper level by returning whatever fuel isn’t needed to the surge tank. Running a line from the FPR back to the surge tank completes the fueling circuit and also completes the conversion to fuel injection for our fuel setup in the Chevette.