75lb
84lb
95lb

Why isnt anyone running any larger than a 60lb maybe this has been asked before but i am curious

 

Cause the PCM cant handle larger the 60s. Actually 60s max out the pcm and are kinda to big as it is. Arent you offering to tune peoples cars with HPT?? You should know this then.

 

As of right now, no one has hit the threshold of the 60lbers. So why even go up to a bigger injector. Plus, once you start playing with those sizes, a fuel pump and line upgrades would be in order. Then there is the issue stated above.

 

The highest IFR the PCM can handle is 64 #'s so really even 60 # injectors are over the limit at the higher rates of vacuum so you need some extra help to get it to idle right.

 

just asking i had the offer of some bigger ones to test with

 

in theory with upgraded fuel pump fuel lines you could run bigger what would it take to get bigger into the pcm besides a stand alone i am a programmer and i know that those limits are jsut coded into the dam thing there is no physical limit you can tell it to shoot as much as you want... there has to be a way around

 

well couldnt you add an safc before the ecu to piggyback?

 

what duty cycle are the 60's running at? my car isnt active so i cant just go check

 

Well put!

 

im trying to explore the unknown with rob out we have to have a new jackass to blow **** up

 

60lbers and traffic sux! Especially decelerating...wtf at 1500 rpms my car always gives out a huge jerk forward. 60lbers.....

 

Oooooooh, thats from the 60's, I thought I just didnt knowe how to drive lol

 

The decelerating is a tuning problem

those larger injectors are low impendance and we use high impendance youd have to custom weld resistors in to get them to work...then the pcm wont even have near the resolution reqired to run em...nobody has tried cause noone has needed em yet

 

i have wicked plans blower swap + turbo soon

 

60's already sit below their minimum pulse width at idle making them not spray properly. Anything larger would be even worse.

Your best bet is to go for a piggyback to controll a second set of injectors or a full ECU overhual with a ECU that will handle 2 sets of injectors. I know Emerald is capable and I was told Motronic is aswell.

Personally I would go with a set of 42.5# primaries in the stock location and equivalent or larger to come on after the primaries reach 50% duty cycle and then have them increase together.

Might want to talk to RandD on the RL forums. They are running a second set of injectors with a piggyback on a 2.4 Turbo Solstice and they used a similar setup on a twincharged Ion RL.

 

Because the drivers in the ecm cant run anything larger. its that simple.

lol...

 

yea but with a piggyback it can

 

this is a little off topic but sense we are on the topic of injecters can you swap a pulley without getting a check engine light? for example i want to swap my 3.0 for a 2.7 and i have stage "2" 42lbs per hour injectors is that ok to do or will it be to lean? and most importantly will i get a check engine light from just a pulley swap with my stage 2 tune?

 

you can do that if you want your motor to blow... that is a very bad idea there man...

 

it already has. but i think 60lbers wont be enough for my upcoming setup im thinking 95-160lbs

 

I also have an off topic question...

If 42lbs injectors are too small for 2.79" pulleys and smaller, and 60's seem to be too big for a daily driver especially on a pulley as big as 2.79-2.8", why hasn't anyone tried something in between like the 50lbs from cobaltperformanceparts? Wow that was one hell of a run-on. Anyways, I'm interested in seeing if someone can tune these injectors to get a much more reliable daily driver with a 2.8" pulley: http://www.cobaltperformanceparts.co...ion-p-215.html

 

not sound mean but do a search.... anyways if you want to do a 2.7 better get the 60lbs 42lbs will max out on a 2.8

 

I was talking to the guy above you....
But those are just way too big man... car is gonna run like **** if it even idles at all.. trust me.. I"ve done these types of projects before.. as stated above the best idea is go with 42's as primary injectors and a set of 60s as secondary's controlled by a standalone.. (thats what I'm doing by the way) you'll keep a good idle and driveability and still have the fuel for up top when you'd need it

 

sounds like you guys have some serious projects going on

 

sorta had hopes to keep stock ecu stand alone is a hell of alot of work