Hi,

Has anyone used a fuel cooler on their FI Z?

We have just finished tuning the Z and made 576 HP at the wheel with max boost of 20psi (5000rpm) falling back to 18psi.

we seem to have an issue with the fuel getting too hot and going lean after a pull (no det though as we are using water injection)

Has anyone else running the APS fuel system had this problem?

PS we are 1500m above sea level ,fuel rating of about 95mon.

I will post a graph up soon but I suspect that the tune needs to be looked at as well as we make about 868nm torque at 4200 dropping to 520nm at 6500rpm.

 

cool cans are mainly used in drag race applications where you fill the cool can up with ice water and it cools the fuel down.

I haven't seen anyone use a coolcan or any other fuel cooler on a G/Z, but there is no reason that you can't do it.

I could be wrong, but the temp of your fuel shouldn't affect your A:F ratio. The density of the liquid fuel isn't going to get thinner with a little heat in the fuel system. The heat will affect your resistance to pre-ignition though.

 

The Porsche 928's had a really cool feature on them. They had a block that the fuel went through that was cooled by the A/C. It actually worked really well.

If you look in this picture you can see a black tube with a yellow sticker on it to the left of the FMU. That is a fuel cooling block that is integrated with the A/C system.

 

that picture gives me the chills.


just think , if one of those little vacuum lines was to pop off, it could blow the engine up.



Vacuum lines are the most important thing on the car...

 

LOL. Yeah we have taken care of those T's. When that picture was taken we didn't have the proper stuff to finish it and we were dealing with some other issues.

 

What's the temp delta that you're seeing? I am curious how significant the change is. If the temp change is big enough, it could theoretically effect the fueling. Fuel will expand as the temps rise so you'll have less actual fuel in the same volumetric unit. Since fueling works based on volume, not mass, you could technically be delivering less fuel per unit of volume and ECU would not know to correct based on O2 feedback because you're in open loop in your scenario. It could happen but your temp changes would have to be significant.
Unless you have good evidence to support the theory that your fuel temps are at fault here, I'd look in many other places to account for the lean out before I'd start questioning fuel temps: fuel pressure, fuel pump, pressure regulator, IDCs, dirty fuel filter. Good luck.