044 pump upgrade

[Brummmie]

Having fuel starvation problems AFTER upgrading to the bigger pump.. It turns out, that the standard TVR wiring is too spindly and was not supplying enough current.
Running a direct wire to the pump from the battery showed an increase of 5psi instantly across the range. So Craig at Dyno Torque has rigged me up a relay using the old pump wiring as the trigger, and we then sourced the back of the fuse box for the bigger power. There is a proper big cable there that runs direct from the battery.
So anyone who has upgraded to this pump could actually be running MORE dangerous than the standard!!
Just might be worth checking...

[TT Tim]

Thanks for the heads up Paul, will certainly check mine.

Tim

[dbv8]

Cheers, will check mine also.
I should be ok for fuel off this pump for my mild set up.
I will be using the old standard pump just to suply the nitrous system independantly.

[Brummmie]

dbv8 said:

Cheers, will check mine also.
I should be ok for fuel off this pump for my mild set up.
I will be using the old standard pump just to suply the nitrous system independantly.

No not really, if your wire is not supplying enough current, the more you ask the less it will give. You need a gauge on it to be sure, put a direct wire on it if your pressure jumps up, then you need to upgrade your standard wiring.

Edited by Brummmie on Wednesday 28th July 10:54

[dbv8]

Sorry thats what i meant.... will be checking.
But it would have been a big worry last year when i was feeding the system and the nitrous system off the 1 pump.
I will rewire and set up pressures as required for NA and the gas.

I will also have fuel pressure switches in both supplies that will kill the gas if the pressure drops for any reason.

[shpub]

Yep been there done that. On the supercharged Wedge I fitted two pumps in parallel with separate 30A feeds so that if anything happened with one pump, the other would be able to cope. Yes it cost a lot more but peanuts compared to the costs of repairing detonation damage.

Worth doing on any serious motor IMHO.

[shpub]

dbv8 said:

I will also have fuel pressure switches in both supplies that will kill the gas if the pressure drops for any reason.

be careful with those as the fuel pressure regulator is referenced off the manifold pressure and the actual fuel pressure does change quite a bit. You can get a 8lb drop quite easily when the manifold vacuum drops. Get a fuel pressure guage installed. Spa do one that you can program various alarms at certain pressures.

[dbv8]

shpub said:

dbv8 said:

I will also have fuel pressure switches in both supplies that will kill the gas if the pressure drops for any reason.

be careful with those as the fuel pressure regulator is referenced off the manifold pressure and the actual fuel pressure does change quite a bit. You can get a 8lb drop quite easily when the manifold vacuum drops. Get a fuel pressure guage installed. Spa do one that you can program various alarms at certain pressures.

The pressure required for the nitrous is actually quite low. The sitches are set quite low as a safety in case of something stupid like running low in the tank and sucking on fumes! Engines dont like to run on nitrous alone

Oh to add... i have a gauged regulator as supplied by Eann Whalley and aim to fit another.

Edited by dbv8 on Wednesday 28th July 12:24