celicauk
07-13-2002, 11:55 AM
Well another hour or two on the rollers courtesy of Tom Airey Tuning this morning.
Things are looking very good indeed, still having issues with fuelling but I was pretty sure this would be the case.
The car now has a boat load of bottom and mid range power and the top end requires a bit of fine fettling and an issue with fuel supply sorting and I will have quite an impressive output.
The figures so far are 168bhp at the wheels, this is at approximately 5000rpm so room for more, at this point the engine is pinging like a good 'un. BTW - This equates to a tad over 200bhp at the crank, this is more then 60bhp up on my baseline, pretty good gain if you ask me, and not even fully tuned as yet, bear in mind that expectations where of a 40% increase so I am well pleased, it basically means that in its current form it is more powerful than a stock VVTLi
Problem with the fuelling is whats called pulsing. What is happening is the injectors are so huge they are pulling fuel from the rail faster than it can fill up. This isn't necessarily a pressure problem, more likely a bore size, ie the capacity of the rail is insufficient for the full load requirements, not exactly shocking as the injectors are more or less 50% larger than stock.
My solution to this will be:
Uprate fuel pump.
Increase size of fuel feed line from pump to engine bay.
Fit a four way splitter on the engine end.
Distribute the fuel directly to each injector from the splitter.
If this doesn't solve it then I may have to convert the car to a return line fuel system and fit the SARD regulator I have to keep the pressure constant, I don't feel this is going to be necessary though, we shall see
Well thats about it, I also just fixed the ABS fault my car has had for a while, turned out to be a bit of didgy wire on the ABS ECU, signal from the front right speed sensor wasnt getting through, five minutes and a bit of solder later all sorted.
Things are looking very good indeed, still having issues with fuelling but I was pretty sure this would be the case.
The car now has a boat load of bottom and mid range power and the top end requires a bit of fine fettling and an issue with fuel supply sorting and I will have quite an impressive output.
The figures so far are 168bhp at the wheels, this is at approximately 5000rpm so room for more, at this point the engine is pinging like a good 'un. BTW - This equates to a tad over 200bhp at the crank, this is more then 60bhp up on my baseline, pretty good gain if you ask me, and not even fully tuned as yet, bear in mind that expectations where of a 40% increase so I am well pleased, it basically means that in its current form it is more powerful than a stock VVTLi
Problem with the fuelling is whats called pulsing. What is happening is the injectors are so huge they are pulling fuel from the rail faster than it can fill up. This isn't necessarily a pressure problem, more likely a bore size, ie the capacity of the rail is insufficient for the full load requirements, not exactly shocking as the injectors are more or less 50% larger than stock.
My solution to this will be:
Uprate fuel pump.
Increase size of fuel feed line from pump to engine bay.
Fit a four way splitter on the engine end.
Distribute the fuel directly to each injector from the splitter.
If this doesn't solve it then I may have to convert the car to a return line fuel system and fit the SARD regulator I have to keep the pressure constant, I don't feel this is going to be necessary though, we shall see
Well thats about it, I also just fixed the ABS fault my car has had for a while, turned out to be a bit of didgy wire on the ABS ECU, signal from the front right speed sensor wasnt getting through, five minutes and a bit of solder later all sorted.