Does this sound right? Stock m20, HX35. MS logs are showing >100% duty cycle. I know MS calculates DC off of a variety of factors and isn't necessary accurate. I was always under the impression that those injectors are capable of quite a lot more than that...
Announcement
Collapse
No announcement yet.
Bosch 42lb Green injectors maxing out around ~10psi?
Collapse
X
-
Gasoline, I assume? When you "run out" of duty cycle, do your AFRs start climbing? Is your fuel pressure manifold referenced? As I'm sure you know, it's impossible to have more than 100% duty cycle.
10psi doesn't mean much, per se. The injectors you have should get you to around 325whp, I would expect. How fast does the car feel?'84 318i M10B18 147- Safari Beige
NA: 93whp/90ftlbs, MS2E w/ LC, 2-Step
Turbo: 221whp/214ftlbs, MS3x flex @ 17psi
-
Originally posted by Fraser View PostYes, Gasoline. The AFR's are where they should be, even when the indicated DCs are through the roof. The fuel system is bone stock m20 stuff.
The car is pretty fast, butt dyno says 280hp or so, maybe a little more? But who knows...'84 318i M10B18 147- Safari Beige
NA: 93whp/90ftlbs, MS2E w/ LC, 2-Step
Turbo: 221whp/214ftlbs, MS3x flex @ 17psi
Comment
-
Originally posted by nando View Postif your injector constants are not right, the duty cycle will be wrong. If you're seeing duty cycle over 100% then you need to readjust the constants. This will also likely require VE table adjustments.
I'll post an MSQ and log later this afternoon, I need to grab my computer from the shop to look into this further. Thanks!
325iX Turdbo Rally/Hillclimb/Beater
Comment
-
if it reads 100dc+ yet it still responds to increasing ve
then it is not at 100.
idk the limits of the stock pump or the draw but i do know the stock wiring sucks
and if u wire the pump from the batt. on a relay it will get you where you need to be.
if not for this then for future pump needs. stock wiring is shit.
my 255 was going lean and wiring it this way gave me that extra needed fuel
10psi on stock hx35 setup i don't think you are maxing them out.
i am rusty on MS settings but your dead time and fuel requirements are not right.Last edited by LowR3V'in; 03-12-2019, 08:30 PM.
Comment
-
Thanks for the info- that's not the first time I've heard it's wise to rewire the pump with it's own circuit and relay.
Here is a link to the current tune and a couple logs- one is ~12 psi and is busting 100 DC, another is back down to 10psi and still hitting near 90, which I do not believe to be correct. Thanks to whoever is interested in looking at them...
325iX Turdbo Rally/Hillclimb/Beater
Comment
-
Originally posted by LowR3V'in View Post9.8arf @ 11psi it's drowning.
Even your targets are 11.5afr that is way too rich for the boost.
try 12.5 afr.
I'll work on those tables a bunch over the next few days and see what it looks like.
Thanks for your help!
325iX Turdbo Rally/Hillclimb/Beater
Comment
-
Originally posted by ForcedFirebird View PostShoot me a datalog with the current .msq, last one said 65% if memory serves me correctly. I owe ya a beer/soda. :p
I'll send over the most recent log and MSQ and see what you think... I'd like to run 12-14psi regularly which looks like shouldn't be a problem with the current hardware once I get the tune a little more dialed. Other than my stock clutch which is starting to slip like a bastard and needs to be replaced ASAP.
Thanks guys!
325iX Turdbo Rally/Hillclimb/Beater
Comment
Comment