take a pill...

when the wires are worn the resistance gets thrown off giving a less accurate signal at the lower fuel level range where the most wear generally is. eventually the wires break and the gauge reads zero before the tank is actually empty, i figured you could gather what i was getting at. i have seen a number of 2nd gens with frayed wires below 1/4 tank which worked fine up until that point then dropped to 0 on the gauge as soon as they hit the bad spot.

Can I use an S5 tank in my S4 if I swap the straps also?

Technically, yes, but there's alot of wiring to do. Plugs are different, senders are different, fuel pump pickups etc etc.

:banghead:

i really don't imagine it is that difficult to swap them. the S5 sender plugs right into the S4 harness at the LR strut tower 4 pin rectangular plug. you just won't have the junction on the top of the tank anymore as the S4 is a solid connection to the strut tower.

i have swapped a few S4 pump housings into S5 tanks as the bulkhead connector style of the S4 pump housing is much more durable than the S5/S6 for high horsepower applications without the need to modify the housing for passthrough connections. you do need to cut and add ring terminals to the S5 fuel level sender and low level sensor and modify the S4 pump housing to lower the pump to the appropriate level though. but that is an afterthought and doesn't apply if you are swapping everything from the S5.

Resistance values that the gauge will see could also be different so there would be alot of trial and error with the S4 sender in an S5 tank. Then again, the values could be the same.... would need a journey into two different FSM's to make sure

Somewhat related to this thread - 1970 MG Midget tank holds 25 Litres (Approx 6 gallons). With the 13B Extend Port under normal driving my range from full is 100km (60 miles).
Yes, I plan on installing a larger tank in the near future. On the upside, I always use fresh fuel.
Downside is no warning light or reserve - empty means empty!

How the heck is it so inneficient? When I drove my car down south I was getting around 13L/100km

Real cars come factory standard with 120lt carbon fiber fuel tank :lol:

Good to hear from other Aussies...
I believe the inefficiency is partly due to the lack of a fuel regulator - or at least I hope so. I believe the fuel pump is over supplying to the Weber. I have fitted a Mallory 4207 last night and am yet to set at 4 PSI. Fingers crossed.

Rice Racing, 120 litres is a lot of weight to be lugging around... I cant think of any car that comes standard with a carbon 120L - enlighten me.

The SP rx7 did (which he owns) and u can only put 60L of fuel or so in if u desire

Thanks Mazdabater, I had no idea they were factory produced at 120L and of carbon construction.

Australia had a special high performance version of the RX-7 in 1995, dubbed the RX-7 SP. This model was developed as a homologated road-going version of the factory race cars used in the 12hr endurance races held at Bathurst, New South Wales, beginning in 1991 for the 1995 event held at Eastern Creek, Sydney, New South Wales. An initial run of 25 were made, and later an extra 10 were built by Mazda due to demand. The RX-7 SP produced 204 kW (274 hp) and 357 N·m (263 ft·lbf) of torque, compared to the 176 kW (236 hp) and 294 N·m (217 ft·lbf) of the standard version. Other changes included a race developed carbon fibre nose cone and rear spoiler, a carbon fibre 120 L fuel tank (as opposed to the 76 L tank in the standard car), a 4.3:1-ratio rear differential, 17 in diameter wheels, larger brake rotors and calipers. An improved intercooler, exhaust, and modified ECU were also included. Weight was reduced significantly with the aid of further carbon fibre usage including lightweight vented bonnet and Recaro seats to reduce weight to just 1218 kg (from 1310 kg). It was a serious road going race car that matched their rival Porsche 911 RS CS for the final year Mazda officially entered. The formula paid off when the RX-7 SP won the title, giving Mazda the winning 12hr trophy for a fourth straight year. The winning car also gained a podium finish at the international tarmac rally Targa Tasmania months later

What's a bonnet?

An Australian hood.