Discussion
Looks like may car is over fueling. Going through the GO juice real fast (and only running in). The exhausts are really thick black, running well rich. Might be ringing the US guys who programmed it to get me out another ecu, but is there anyone in the south who could programme it, if I get it to some rollers, to get the fueling sorted. My need a tanker to follow me around otherwise. (At least it is not running lean).
jellison said:
Looks like may car is over fueling. Going through the GO juice real fast (and only running in). The exhausts are really thick black, running well rich. Might be ringing the US guys who programmed it to get me out another ecu, but is there anyone in the south who could programme it, if I get it to some rollers, to get the fueling sorted. My need a tanker to follow me around otherwise. (At least it is not running lean).
Whic ecu do you have Jon?
Boosted.
Modded Delphi (Corvette ECU).
Fuel Pump is std TVR which is supposed to put out a regulated 34 - 38 psi through the Rover (so must be more than that unrestricted). Chevy I beleive should be around the 50psi mark regulated.
Most likely one or a combination of these.
Steve - what did you do for fuel pump - as do not want to jump on the guy who programmed the ECU if it could be the pump.
Fuel Pump is std TVR which is supposed to put out a regulated 34 - 38 psi through the Rover (so must be more than that unrestricted). Chevy I beleive should be around the 50psi mark regulated.
Most likely one or a combination of these.
Steve - what did you do for fuel pump - as do not want to jump on the guy who programmed the ECU if it could be the pump.
C5 fuel pump runs at 4 bar (56 psi). The problem will be in the ECU as it will be mapped too rich. You could modify the mapping yourself with something like LS1Edit software if you have an OBDII connector, but I doubt you do.
You should be able to re-map the ECU, but how you physically connect to it without removing it from the car is anyone's guess.
The C5 ECU can be remapped in the car, but you may well have to remove yours to get someone to program it.
You should be able to re-map the ECU, but how you physically connect to it without removing it from the car is anyone's guess.
The C5 ECU can be remapped in the car, but you may well have to remove yours to get someone to program it.
I'll get may father to look into this with US guys - has the car for the week. We have a full cutomised ECU and all the connectors (OBDII connector!? - will check on this). If we do do you know anyone round where we live that might have the LS1EDIT kit we could take to a RR. If done out of the car - and we back of the fuel supply how do we really know by how much unless on the RR?
The OBDII connector looks a bit like a 1980's printer connector from a p.c. !
Most if not all of the ECU programmers that are sold for the Corvette are next to useless or very limited in what they can do IMHO.
LS1Edit is not the best, but at least you can download the map to your laptop, modify the settings (Excel type tables) and then upload back to your ECU. the latest version comes with a real time monitor which allows you to see what the map is doing and in what situations.
Most if not all of the ECU programmers that are sold for the Corvette are next to useless or very limited in what they can do IMHO.
LS1Edit is not the best, but at least you can download the map to your laptop, modify the settings (Excel type tables) and then upload back to your ECU. the latest version comes with a real time monitor which allows you to see what the map is doing and in what situations.
Jon,
Your fuel pressure is way to low and your pump won't be capable of fuelling that engine properly. I've seen this happen before so I'd suggest you get a bigger pump.
As for the remap with edit, unless you've done it before you will probably run into heaps of problems, lots of them. I recommend you speak with Paul at Wortec who are based at chichester.
Lastly, are you sure your pcm can be remapped? Sometimes the programme is flashed into it and those ecu can't be mapped iirc.
Boosted.
Your fuel pressure is way to low and your pump won't be capable of fuelling that engine properly. I've seen this happen before so I'd suggest you get a bigger pump.
As for the remap with edit, unless you've done it before you will probably run into heaps of problems, lots of them. I recommend you speak with Paul at Wortec who are based at chichester.
Lastly, are you sure your pcm can be remapped? Sometimes the programme is flashed into it and those ecu can't be mapped iirc.
Boosted.
LS1 Edit is usually vin specific - doubt if anybody in UK has tuners multiple use version. You can reprogram with LS1 Edit but its data logging is crap - people use EFI Live for logging. So that's two pieces of software at $500 each.
The best solution is HP Tuners, $500 for a reprogrammer and a data logger, with much much more functionality. For an extra $300 they go to 2 bar MAP tuning for FI.
The best solution is HP Tuners, $500 for a reprogrammer and a data logger, with much much more functionality. For an extra $300 they go to 2 bar MAP tuning for FI.
So I might need a 4 bar pump (C5? - but the 36psi from the TVR pump is the 'regulated' pressure to the Rover FI so it might be making 58.
But likely will need the ECU / fueling adjusted - could this be done remotely i.e. off the car - not on rollers if I am just saying I have a very rich exhaust - not accurate for making adjustments!?
May give the chaps that have been recommended a try.
But likely will need the ECU / fueling adjusted - could this be done remotely i.e. off the car - not on rollers if I am just saying I have a very rich exhaust - not accurate for making adjustments!?
May give the chaps that have been recommended a try.
no number or adress on www.Wortec.co.uk site weird - do you know what it is? Seems like they could be the people.
Without all the info, it sounds like you may have a fuel pressure issue.
Lots of modern motors run fixed fuel rail pressure (usually approx 55PSI), and have no fuel return line from the fuel rail.
In this case the fuel pressure regulator is a part of the pump, which is always in the fuel tank. Excess fuel is just spilled straight from the pump.
When you convert to this system from the rather better (but more expensive) older type system, you must place a fuel pressure regulator under the bonnet. The return from the regulator goes back down the tank return line as before.
If you connect the pump straight to the rail without a regulatro, you will get a pressure of typically 75-95PSI hence giving you rich running.
Where fuel pressure is too low, you get poor atomisation. This accentuates the lean mixture problem by causeing a slow burn in the chamber, creating lots of soot even though the mixture is weak.
Give me a call if you want to chat it through.
Good Luck!
Lots of modern motors run fixed fuel rail pressure (usually approx 55PSI), and have no fuel return line from the fuel rail.
In this case the fuel pressure regulator is a part of the pump, which is always in the fuel tank. Excess fuel is just spilled straight from the pump.
When you convert to this system from the rather better (but more expensive) older type system, you must place a fuel pressure regulator under the bonnet. The return from the regulator goes back down the tank return line as before.
If you connect the pump straight to the rail without a regulatro, you will get a pressure of typically 75-95PSI hence giving you rich running.
Where fuel pressure is too low, you get poor atomisation. This accentuates the lean mixture problem by causeing a slow burn in the chamber, creating lots of soot even though the mixture is weak.
Give me a call if you want to chat it through.
Good Luck!
Didnt LSV vuy HPTuners software ?
From what, I have read, most people suggest its better and easier to use than LS1Edit.
My fuel system is far from standard, although it make little odds. It just follows a normal efi pattern. Tank, pump, rails, regulator, then return to tank.
An un-restricted fuel pump will give zero pressure, just with lots of flow.
What way is your fuel system plumbed up ? What type of pump etc ?
What fuel rails are you running ?
From what, I have read, most people suggest its better and easier to use than LS1Edit.
My fuel system is far from standard, although it make little odds. It just follows a normal efi pattern. Tank, pump, rails, regulator, then return to tank.
An un-restricted fuel pump will give zero pressure, just with lots of flow.
What way is your fuel system plumbed up ? What type of pump etc ?
What fuel rails are you running ?
As Mark says, you need your regulator on the rail and not by the tank.
These engines are also seem sensitive to inlet tract length so your ecu won't be correct although it would be ok. Your ecu thinks you are in a stockish american car, not a tiff. The HP tuners package is very popular and I think Wortec are using this for modding some of the holdens.
Boosted.
These engines are also seem sensitive to inlet tract length so your ecu won't be correct although it would be ok. Your ecu thinks you are in a stockish american car, not a tiff. The HP tuners package is very popular and I think Wortec are using this for modding some of the holdens.
Boosted.
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