dsm 450s maxed out??
 

alright i didn't get any responses so let me question this differently. I start leaning out at 6000RPM to red line @ 13-15psi of boost, with a/f ratios in the low 12s. ive been carefull not to get on it unless trying to tune it out... the problem is that i keep adding fuel in those cells in Crome and i'm not getting any change what so ever... DSMs maxed out??


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i'm just wondering if anyone knows how accurate Cromes injector duty calculations are? at 13-15psi i get something crazy like 150% duty on DSM 450s.

Ive read that 450s should be good up to 300whp? i havn't dyno'd this thing yet but i'm sure at 15psi its gotta be making some power. The rest of the set up includes... z6, low comp OEM internals, t3/t4 50 trim.

any thoughts are welcome

Re: dsm 450s maxed out??
 

bump for question change...

Re: dsm 450s maxed out??
 

on a d16y5 with a big 16g, without the methanol I was able to run up into 18psi land without maxing the injectors...somehow I sort of doubt you're maxing yours out.

also, you can look into what duty cycle the injectors are at by the softwares standards...they're usually off (read higher than actual) but can give you some idea of how far off from maxed they are.

Re: dsm 450s maxed out??
 

you are adding fuel in the hi vtec map, right???

Re: dsm 450s maxed out??
 

hmmm... ok that makes me feel better. According to Crome injector duty, i'm %162 @ 15.3psi and 7500rpm. i'm not sure what exactly that means but i'll just keep playing around i guess.

Re: dsm 450s maxed out??
 

UPDATE:

so i'm still having leaning out issues with any thing above 11psi. Over the weekend i did manage to run a 13.7/ 2.2 60ft/ 103mph @10psi.

2 weeks ago it seems that i was able to boost 14-15psi with no probs with a/f. now it leans out regardless of how much fuel i add in. I'm starting to think its my fuel pump not being able to keep up or flow the fuel i need.

what do you guys think?

Re: dsm 450s maxed out??
 

how do you have the fuel pump wired?

either its not getting enough juice to pump out what it should be capable of pumping, or its failing most likely...

Re: dsm 450s maxed out??
 

I have the stock pump wired like it came from honda... but i do have a kill switch wired in... i don't think that would effect anything though. If the switch did make a difference wouldn't my issues be more consistent through out the rpm range?

i'm gonna start shopping for a walbro. i hope that solves my problem.

Re: dsm 450s maxed out??
 

yea bigger fuel pump probly the cause.


otherwise give it some more pressure.

Re: dsm 450s maxed out??
 

might want to consider upgrading to walbro if u havnet already. what size turbo again?

Re: dsm 450s maxed out??
 

replace your fuel filter.

Re: dsm 450s maxed out??
 

i'm looking into getting a walbro right now... 190lp or 255? 190 should be plenty for my 300 goal right?
Is there a major difference with the high pressure unit and low pressure unit?
another thing, i heard that guys are burning up 255ph pumps by running gas tank below 1/4 tank? I'm a student so i occasionally have to run it down to "E."

I'm running t3/t4 50trim

I thought about the fuel filter, but i just replaced it 2-3 months ago... its a possible cause i guess since i like to run my car down to empty.

the season is over and i'm gonna be parking the car for winter soon so... i guess figuring out what is causing this will give me something to do over the winter.

Re: dsm 450s maxed out??
 

Keep in mind the cooler temps this time of year can result in a more dense intake charge
Other than that I agree you may want to run a larger gauge wire to your fuel pump or possibly upgrade it

Re: dsm 450s maxed out??
 

do you still have the stock map sensor? soudns like it is a stock one wich is leaning you out over 11psi. don't know where i heard that but i think i read it on either HT or pgmfi. check it out

Re: dsm 450s maxed out??
 

2.5 bar map sensor