4.5 injectors ....what will they support?

[a1rak]

Does anybody know for sure what the maximum BHP the standard Injectors will support on a 2001 4.5AJP before the mixture starts to lean out....will they support 475BHP.

[itsallyellow]

Well they seem to be ok on mine so i would have thought so.

However i definatly feel they are approaching there limit.

Mike

[spitfire4v8]

You're still on stock fuel pressure Mike too, so well in excess of 500hp if you're going up on pressure a bit aswell.

[itsallyellow]

So there is no point in going for new injectors???

[spitfire4v8]

well i would say buy them if you have to, not if you think you might need them. the exchange rate at the moment means theyre damned expensive.

[Brummmie]

itsallyellow said:

Well they seem to be ok on mine so i would have thought so.

However i definatly feel they are approaching there limit.

Mike

Did you not look when they were on the rollers? You would have been able to see if they were approaching 100%. As said here you could up the fuel pressure but then you will have to re map to suit, as you would richen the whole map.

[fatjon]

I got some siemens Dekra 640cc ones from the US for about $58 each plus about 15% import tax. I think it was about £250 in total for 8 when the exchnage rate was about 2:1, so a bit more now. Still much cheaper than in the UK though.

What's the part number of the originals, I have a chart with the specs for loads of injectors so I might be able to look them up, then it's just a simple calculation based on the flow rate and BSFC for the BHP limit.

Jon

[a1rak]

got a call from Paul at Austec, I think he does all their MBE chip tuning.
He informed me that the standard injectors are capable of 475bhp but reaching their limit at 500bhp. Seems like I will not have to change the injectors then