I posted this, yesterday in the tech section, but got no response, so hopefully someone over here can help me.


A few months ago, I purchased another 93 corvette, which is heavly modified with a turbocharger and a Accel DFI system. (formally Bruces car) I have never driven the car yet, but I have noticed, while sitting still, running in nuetral, (6sd) when I try to rev the motor, the traction control engages and kicks the throttle back.
Also, Bruce had said he had noticed that one of the brakes would lock up sometimes.
Any ideas what would cause this?
Also, I purchased a 95 z-28 throttle cable to bypass the traction control box, and I was considering bypassing the ABS. Would this be as simple as running new brake lines, 1 to the front and 1 to the rear, then teeing to each wheel from there?

 

some sort of backfeed in the wiring system, or trouble with the CCM?

I got rid of my ASR motor and put a 20 ohm 20 watt ceramic resitor in it's place to simulate the loading.

The Abs I might hold off on. If I remember the brake lines to the car looked icky here and there. Replacement along with a heavy inspection of each wheel bearing and it's respective sensor. Rusty reluctors casue more headaches in the north...

 

Hey Rick, thanks for the response. I have 4 new tires ordered for it, so when I pull the wheels, I will check bearings and clean the sensors etc. I do suspect a short in the wiring somewhere. One thing I have noticed is something will drain the battery, if left connected over night. I found 2 relays in the console area, and there are 2 more that have been added on the firewall by the battery. Not sure how much of this is left over from when the car had nitrous on it or how much is being used now.
As we talked before, I am running new circuits for the oil pump and the waterpump for the intercooler. I have not found out how the dual fuel pumps are being fed yet.
Lots of little things to figure out. But once I get it all figured out, im sure it will be worth it!!

 

Rich
The 2 relays by the battery I believe 1 relay is for the fuel pump and electric water pump. the 2nd relay is for the water pump for the water to air intercooler. That water pump is mounted inside the water tank and the 2nd relay is also activate the turbo oil pump. BTF did all the wirings as far as I can remember it. I would leave the relay alone unless you choose to re-wire everything.

About the dual 255 fuel pumps. both pumps inside the fuel tank and Y it to a -08 AN out to a -10AN feed all the way the firewall and Y to a -08AN and connect to both fuel rail. Both fuel pump run full time. If the **** pit show you got 3 bar of fuel on the fuel guage. You better fill it up soon because the dual 255lph pump will empty the tank very quickly and leave you on the side of the road. This have been my experience in the pass.

Bruce

 

Hey Bruce, thanks for the response. Do you know what the relays are for that are in the console behind the 2 lights that were added?

 

I don't remember we install any relay in the console. That probably were installed by Agostino Racing Engine in Canada when they installed nitrous system on the car then.

Later BTF re-wire the 2 lights on the console. 1 one light is monitor the oil pressure going to the turbo. example: when you rev the motor the light should come on and turn off itself. if it does not come on, it means the turbo is not getting oil flowing in. That is why you will see a oil pressure switch mounted on the turbo. The turbo oil line is also have a restrictor valve that can be open the valve for more oil flow or less oil flow. That valve can be seen near the turbo area. Example, the motor is idling only, the light don't turn on if you open the valve more it will turn on. we did this is to be able to control oil flowin in to the turbo. To much oil going into the turbo is no good.

the 2nd light is monitor boost pressure, when it see boost, it will activate the water pump inside the water tank. But later we decided to run the water pump full time. so the 2nd light is a dummy light now.


Bruce

 

Hey Bruce, thanks for the info. Rick is sending me pictures of the build up that the two of you did with the car. I plan on trying to photo what I do as well and keep a photo album of the car.

 

Quick question. When you rev the car is it up on jack stands? If that is the case the rear tires tend to spin with the engine running. If the front tires arn't spinning it seems to the car that the rear tires would be spinning. Hence the traction control kicks on.

If it is not up on jackstands and the rear tires are not moving then you probably have a faulty wheel speed sensor. If a wheel locks up under breaking for more than a fraction of a second then my bet would be on a faulty sensor/wiring. Does the servise ASR or ABS light ever come on?

I actually design these systems for a living so if you have any other questions feel free to send them my way.

For my traction control system, I just unplugged the power to the ASR motor under the hood, it sets the Service ASR light, but that doesn't bother me, and if it starts to rain, I'll pull over and plug the motor back in, takes 10 seconds and I'm safe again.