I have a 1985 RX7 race car which competes in the SCCA Improved Touring Sedan class. It has a 13b motor in it. I just purchased it.

Towards the end of last fall, I had it out on the track for the first time on a track day. The track was Lime Rock.

The car ran fine all day, but at the end of the day, during the final few laps, the car began to stutter in just one corner.

I don't know if you know Lime Rock, but as I ran through the "esses", which is essentially a quick left hand turn, the car ran fine. But as I took the right hand turn to go down the back strait, the car would stutter and stumble until finally picking up and accelerating down the back strait as if nothing had happened. It started out as only a brief stumble but got progressively worse every lap.

It seemed like a fuel starvation problem to me. I noted that I started out with a full tank and it was at the 1/2 level when the problem started. Then again there's the situation of taking a left hand turn and then an immediate right, but that was not a problem earlier in the day? Perhaps a heat or vapor lock problem?

Any ideas? Any idea where I should start?

 

You would have better responses to your question if you post it in the 1st gen section of the forum. My best guess is that the fuel pickup sock (filter) in the tank is either dirty or missing. On 2nd gens, if the tank sock is dirty or missing, you get momentary fuel starvation on left turns. The pickup tube may be on the opposite side of the tank on 1st gens. Hope this helps.

 

Oops. My first post.

But thanks for the response.