74goldtarga

Did a little Google search on swirl pots so I can start to understand what the purpose/function of this setup is. I have lost fuel pressure on the track with my fuel level nearly empty - it would seem that most people with 944 track cars do not have something similar to this. Are you wanting to be able to get every last drop out of the tank so you can run longer races or carry less fuel or is this just for peace of mind on fuel supply?

Dubai944

The swirl pot ensures there is always a supply of fuel at the main pump inlet. With higher lateral acceleration you can get some fuel starvation with the standard tank. I used to get a predictable engine stumble in some right hand corners before using a swirl pot with fuel running away from the pickup particularly toward the end of races with lower tank levels. Fuel cells have proper collectors and trap doors around the pickups to prevent those types of problems.

Chris White

In the real world fuel cells have more of an issue with starvation than the stock gas tank. Most 944s end up running a ‘Swirl pot’ if they have a fuel cell with a real safety bladder and multiple pick ups. ….some of us also call them jockey tanks!

Paulyy

And the bad thing is ours is so close to the exhaust headers leaving no room for much custom work. i mean it's possible to make4-1 equal length headers but just it'll be a lot more screwing around.

TonyG

So did I. Then I decided to run an extra 3 gallons of fuel. Problem gone.

If you're low enough that you have fuel starvation, you didn't put enough fuel in to begin with.

:-)

TonyG

Dubai944

In my real world I have never had any problem with my fuel cell. Suppose it depends on the design of your cell. I still have the swirl pot and pumps sitting in the garage if I ever need it..


Haha. I coud never figure out how to put in more than a full tank... I would always get the problem in the last 10 minutes of 1 hour races regardless.

TonyG

You need to know what your full load fuel consumption is at any given track.

Fill the tank up to the top so that it over flows... do 5 hard laps, come back in and fill it backup. Divide by 5. Now you know.

I always add enough for 3 extra full load laps to avoid fuel starvation.

If it's a timed race rather than a lap count race then I add enough to do 6 minutes of full load.


TonyG

Dubai944

Good idea, except for the overflowing bit...my filler is inside the car

333pg333

Well I'm essentially just following advice. With the car changes which will increase lateral loads a decent percentage (I hope) then this is a fuel starvation prevention issue rather than running out of fuel issue.

In regards to the amount of fuel pumps, the guy doing the wiring works on a lot of top end racecars down here and assumed that I'd be running 30psi regularly. One of the Evos he worked on with the last Superlap down here was running 30psi in the corners and 40psi on the straights. All running at least 3 pumps. I suggested that we won't be doing that sort of thing so I'm thinking 2 044s will be fine.

333pg333

Oh, ps...does anyone have pics of the 968 turbo RS intake? Was it different to the 951 version (apart from what I remember they might have been Magnesium?).

95ONE

Pat, the last pic I saw of one had what looked like a regular old 951 intake.

95ONE

THATS IT! I was wondering why his looked so straight and easy. LOL. DUH. I was looking at that the other night and thinking His pipe had so much more room than mine.

Whew. Thought I was crazy for a minute there. No steering shaft. That's the difference.

333pg333

The downside of that is that if you want to buy aftermarket headers such as SFR...they don't fit.

333pg333

Interesting that the factory raced with that intake and their budget. Almost feels like the motor in that car was a bit of an afterthought in that they could have gone with a 16v with custom intake/plenum etc but almost threw in the 8v out of convenience/time.

I was discussing the stock intake with the engineer and he wasn't so quick to dismiss it based on what the factory deemed fit for their program. He felt that making custom intakes could become a bit of a goosechase and wasn't that keen on ITBs for turbo cars.

Thom

As far as I know the standard 951 intake was used on the factory 3.0T cars.
They seem to have made it all from the proven & cost effective side since they had a power-to-weight rule to comply with - using the 16V head may have made a killer car but that couldn't have competed.