S54 Swap Question

[E30Strube]

I'm not getting fuel and the engine isn't starting. It will turnover, but not crank. Since I have an E30 M3, I still have the 4 cyl module in the cluster. Would not changing it cause no rpm signal and no start?? The starter is seeing 12V as is the fuel pump relay. There is nothing at the inline pump.

[jrdeamicis]

I'm not getting fuel and the engine isn't starting. It will turnover, but not crank. Since I have an E30 M3, I still have the 4 cyl module in the cluster. Would not changing it cause no rpm signal and no start?? The starter is seeing 12V as is the fuel pump relay. There is nothing at the inline pump.

First..

You can't ask a question like that and not tell us what is running it.

[VinniE30]

[E30Strube]

Sorry, should of included the info. Stock E46 M3 ECU that has been remapped, S54, into an E30 M3. I'm using the stock intank pump and a Walbro inline unit. Stock E46 M3 FPR.

[FredK]

I haven't gotten this far yet... but in the key on position, are you getting power to pin 1 of the DME at x6004?

I assume you're using a common single pole, single throw Bosch relay for the fuel pump? I'm assuming you aren't getting power at Terminal 87, otherwise the fuel pump would activate.

The tach should not matter to the engine firing, at least it doesn't make sense that it would. The engine speed would, however, which is read off the crank position sensor.

[nando]

Are you running ews? Ews delete flash?

The ecu doesnt care about the cluster coding.

as far as the fp relay, don't you have to use the one from the e46 m3? its not just on/off, it varies pump speed based on load/rpm.

More info on wiring and the tune are required.. Any chance you have access to diagnostics software?

[328ijunkie]

Youre not gonna get away with running that fuel pump.

[nando]

E46 m3 fp is cheap and pretty much drops right into the in-tank pump carrier.

[FredK]

Are you running ews? Ews delete flash?

The ecu doesnt care about the cluster coding.

as far as the fp relay, don't you have to use the one from the e46 m3? its not just on/off, it varies pump speed based on load/rpm.

More info on wiring and the tune are required.. Any chance you have access to diagnostics software?

Pretty sure he has the same flash I have, which deletes EWS as well as the need for a PWM fuel pump relay. Otherwise if you use a standard relay, it will rapidly click on and off, making a loud noise.

[e30s50dan]

A lot of info on s14.net engine swap section...but you may know that

[nando]

I dont know why you'd want to delete the relay? It should extend the life of the pump, keep the fuel cooler, not to mention being quieter. Is there some electrical complication preventing it's use in an e30?

I wouldn't want to drive 24\7 at 5 bar pressure. I wonder if they retuned the fuel for that? Maybe its an on/off multiplier variable?

[FredK]

I think it's been deleted. I don't think it's hard to use, but I'm not sure of what technical challenges it might present. I sourced a PWM relay "just-in-case".

[E30Strube]

I'm just using a standard 12V 30A relay and as Fred said, the same reflash. We jumped the relay and the fuel pumps worked just fine. Fuel went through the lines as it is supposed to. I also verified it isn't getting spark. It would seem that the ECU isn't sending the signal to the relay to actually work. The same is true for the coils. Any ideas of what the ECU looks for in order for it to send the necessary signals for fuel and spark? I've read that the S52/50s look for the knock sensor, rpm signal, and cam position sensor.

[E30Strube]

To the poster that said the pump wouldn't work...why is that?? The S14 stock inline pumps work at near 5 bar. The stock intank is just a low pressure pump that sends fuel to the inline. The walbro I'm using works up to 70 psi, which is more than enough to flow what is needed for the S54. It is also the same pump the guys at Horsepower Freaks uses for their setups.

[camberwears]

hope you get it worked out Greg