Quote:
Originally Posted by jamesm
in response to @ DeliciousTuning stating that racerom extends the usable range of the stock injectors, i would ask for an explanation as to how that is possible. i've used racerom and custom maps more extensively than most 'master tuners', and haven't seen anything that would allow that. if it's a map definition that would enable it, that's kind of a moot point being that with romraider, you can define any map you want and use it (not the case with ecutek). the only thing i could imagine that you are referring to is port/di ratio or di fuel pressure targets, both of which are defined in all three of the software packages i've tuned 86s with iirc. i'm very curious to know what you mean by that statement.
as for the whole sd vs. maf debate, i find it comical that the someone arguing that a large maf housing is a solution to maf reading limits would simultaneously argue that speed density has bad low speed drivability. large maf housings introduce problems with low speed drivability as intake velocity drops, and i'm sure you're aware of this. the only way to have your cake and eat it too is a hybrid setup, which can only be done with racerom.
speed density is just like a maf in that if you want good drivability you just have to take the damn time to achieve it. unfortunately, even with maf systems in my experience it seems that very, very few tuners actually do this (and none that etune that i'm aware of, unless there is some way to do it properly without process separation which is logically impossible given two separate, interoperating fuel systems). so as always, it's more about who you go with than any other detail of the implementation. |
Thank you for asking questions it is appreciated.
With regards to DI/PI and RaceROM and extending the designed OE range. The designed OE range as I understand it the injectors DI/PI is ratio based. So if DI is using 40% of then the maximum PI can use 60%, or if PI is using 20% then DI can only use a maximum of 80%, and so on.
I am not going to give away the farm, but I have figured out a way with EcuTeK RaceROM, so that you can use use a maximum of 100% DI and 100% PI, effectively giving you 200% fuel delivery. It is not something within the standard operating procedures of EcuTeK, but it is in there (in RaceROM) if you know how to look at it. This is how a lot of my tunes work on 350+ whp vehicles (turbo kits and superchargers) running stock injectors on E85.
In regards to Speed Density etunes, you are more than welcome to speak to any of my customers running pure speed density on their turbo kits. There are a few out there now and all of them are running quite well and are very happy with the tune. Though I will say it took quite some time to figure out how to make it work well, while using EcuTeK RaceROM to dial in compensations, and of course it is still being revised for improvements.
Cheers,
William Knose