well,

the Dutch Rx-7 club was at the Zandvoort Circuit last weekend and i did my first test there with the trackcar.

everything went great, only sometimes having a dip in the fuelpressure. Never took it to 100% but that's what a test run is for
powerband is not bad, but the most fun starts at 7000+ RPM.
Next time there will be cage, a bucketseat, harness and slick tires

Here's a video from the trackday :

please right click and "save as"

http://rxseven.demon.nl/web/zandvoortweb.wmv

 

Mireck, what fuel pump are you running?

 

Congrat's with the trackcar Mireck! Enjoyed the video as well....

That sure is a nice circuit you have in Holland. Great mix of cars... maybe to many cars? Does it thin out as the day goes on or it's it that busy all day?

Best of luck with future runs.

//Oliver

 

I'm running a EFI Bosch fuelpump. i'm using the returnfuel-line also. At idle the fuelpressure is 6 PSI, and it drops to 4.5 PSI when driving. But when i push the car hard for more than 2 gears, it starts to drop to 2 PSI, and that is too low for the carb. I have a restrictor in the returnline but i think the problem is the pressure regulator. I'm gonna swap it for a better one and see what happens, maybe i need a heavier pump too, or a catchtank setup.

 

It's that busy all day, those trackdays are for "small" carclubs like the Rx-7 Club, Maserati Club, Westfield Club, Fiat 500 Abarth Club ect ect. i drove in the recreational sessions (100 cars on track at the same time), it was just a first real rolling test drive for me. Next time i want to drive the sporty sessions, less traffic in those sporty sessions, but still 50 on track at the same time.

 

Cool, congratz Mireck
You inspired me to get off my *** and start working on the Rx again

*edit*
Ha ha I accidently saved the video to my Porno folder, I will keep it there

 

Sounds good Mireck, look forward to your next video.

//Oliver

 

I didn't know you have troubles with the car?

 

Its been on halt for the last couple of months, endplay issues.
That and the fact that I just put way too much money towards fixing up my appartment
So much to do - so little money

 

Nicely made video Mireck! Nice car too!
Well, I sure wouldn't feel comfy on such a crowded track... Seems the club day is a success!

As for fuel issues: normally a carbed setup wouldn't need a swirl pot, so it might be the regulator.

 

Yeah it must be, this FPR cannot handle higher pressure as 6 PSI, and to stabilize fuelpressure i will have to put in a smaller restrictor in the returnline, and a different FPR.

 

Hey man as far as fuel pressure goes I have run a Holley blue with a dead head regulator for about 3 years on a 13B Bridgeport. Some people say its not good but I beg to differ. The kit costs about $125 from summit racing and will cure your pressure problems. The kit even includes the regulator. Even at wide open throttle on the highway@10400 RPM it has never dried up on me. While doing some dyno testing we were able to extract up to 20 HP just messing around with fuel pressure. Porting will only take you as far as the fuel will let you. It is a bridgeports life blood.