maxed stock inj?
You changed the inj scaling but not the fuel map? In that case the IPW and IDC changed, but so did the AFR.
If the IPW figure we are logging is not IPW but a value that becomes IPW after it is processed with the inj size then the conventionally logged IPW will not reduce when you retune for larger injectors or higher fuel pressure, but it does.
I've been wrong before
but I think in this case people are overcomplicating it based on present evidence.
My IPW logs behave exactly as I would expect them to, at the power levels I would expect them to.
If the IPW figure we are logging is not IPW but a value that becomes IPW after it is processed with the inj size then the conventionally logged IPW will not reduce when you retune for larger injectors or higher fuel pressure, but it does.
I've been wrong before
but I think in this case people are overcomplicating it based on present evidence.My IPW logs behave exactly as I would expect them to, at the power levels I would expect them to.
.
Most injectors aren't rated to a maximum pressure but rather to the industry standard of 43psi at a maximum of 80% duty cycle. Injectors can generally handle over 100psi of fuel pressure as anyone who has turbo'd a non-turbo car and has run a fuel pressure riser can attest to. I ran my stock 235cc injectors on my turbo'd 95 talon to a maximum of 120psi at 80% IDC.
I Scaled my injectors to 472 again but this time I increased my fuel maps by the same ratio as the injector scaling changed (8%) by using ECUFlashes "Multiply Data" feature and globally multipled the fuel map cells by 1.08. As you obviously already know JCSBanks, the IPW and IDC were IDENTICAL on this map in comparison to my standard map. When I say identical, I really mean a mirror image.
Last edited by Jack_of_Trades; Nov 2, 2007 at 10:47 AM.
I like being wrong, helps me remember there is much in the world I dont understand. Now that that is settled, my only question that remains is why some cars can dyno on a low reading dyno at lets say 370whp and only be 95% but another car on a high reading dyno making 370whp will be over 100%. Is it only the difference in the AFRs?
Its either that or someone messed with the injector scaling. Honestly, on stock injectors I have no idea how they can only be at 95% on 91 or 93 octane unleaded. Granted I know my tune is hovering in the 11.0:1 range above 6500rpm but I still don't see me getting it leaned out to be 95% in evoscan while adding an addition 70whp(I hit up to 105% now depending on weather lately). If its race gas or assisted with alky injection, then sure.
Also, if they had an adjustable FPR and the tuner raised the static fuel pressure, that would get them a bot more out of their injectors.
I still would like to see my actual IDC's (or should I say actual IPW) rather than the mathematical numbers, its not absolutely necessary but it would be nice. I tried testing the IDC at the injector harness with my duty cycle meter and it would reach 98.9-99.1% while evoscan reads 104% at this time. I still don't think its 99% right now, my guess would be that the meter loses its accuracy with such high rpm's. It's only accurate to +/- 1% anyhow.
Also, if they had an adjustable FPR and the tuner raised the static fuel pressure, that would get them a bot more out of their injectors.
I still would like to see my actual IDC's (or should I say actual IPW) rather than the mathematical numbers, its not absolutely necessary but it would be nice. I tried testing the IDC at the injector harness with my duty cycle meter and it would reach 98.9-99.1% while evoscan reads 104% at this time. I still don't think its 99% right now, my guess would be that the meter loses its accuracy with such high rpm's. It's only accurate to +/- 1% anyhow.
Last edited by Jack_of_Trades; Nov 2, 2007 at 03:33 PM.
I would bet the difference is in the AFR. I know people locally that run over 12:1 on pump gas with no knock. You couldn't dream of this on a DSM, but the EVO takes it. I still run 11:1, just becuase I'm more comfortable with it, and the power gain at 12:1 isn't worth losing sleep over.
Well the example in question was 370whp on a Dynomite with a stock turbo/cammed/stock injector versus a car that made 372whp on a dynojet here in the NW. The one that I tuned I know for a fact was 11.5:1 but the other one is subject to error. The Dynomite by the way reads in between a Mustang and a Dynojet that are also in the same area.