Table wont go low enough

turbosl2 · Post by **turbosl2** » Sat Apr 08, 2006 11:14 pm

My car seems to be acting very weird since 96# injectors. It is a 4 cyl turbo. I have a MX6300 3 bar map, using MS-2 and version 2.25 MT. My problem seems to be that my pulsewidth is so small. The PW is at 1.0 to get the car to idle and it still idles in the 11s sometimes 10s. I cannot lower the table any lower, they are all at about 1%. I was playing around with the injector opening time (ms) and went from around 1ms to now .8ms, then i had to richen the table up to around 5%, but the car would idle surge. It apeared that the AFR was around 13-14 but would go to 20s and that is when it would surge. Adjusting the table was almost impossible because it would go to either 11s or trying to lean it out anymore it would just surge again. Seemed like there was no resolution. So i tried putting the opening time back to 1ms and it was almost like the table did nothing and it wanted to idle in the 11s with the table to 1%. Any ideas? I am lost. My PW at idle is like 1.035.
Here are a few datalogs i took

jsmcortina · Post by **jsmcortina** » Sun Apr 09, 2006 3:41 am

What size injectors were you running previously and did you have it running well on Megasquirt?

James

turbosl2 · Post by **turbosl2** » Sun Apr 09, 2006 7:43 am

the car used to have 52# injectors, it seemed to idle better with them, but i never had the idle perfect. I would like to get the idle perfect but it seems something is wrong with the pulsewidth being to low and me not being able to adjust the table low enough. My MS also has a flyback board if that matters. Idealy what should i set my injector opening time to? They are 96# injectors low impedence, MS2 with flyback board. I thought i was getting somewhere lowing the opening time to .8ms but then the car would idle surge and afr would be all over, but i did get to raise the table up to around 4-5%. Any ideas? Thanks for your help

jsmcortina · Post by **jsmcortina** » Sun Apr 09, 2006 8:16 am

How many squirts do you have set? Reduce it to 1 if not already.
Are you aiming for 600hp + then ? If not get some smaller injectors.

James

turbosl2 · Post by **turbosl2** » Sun Apr 09, 2006 11:17 am

i think i have it set to 4 squirts 12cyl and 12 injectors, my tach signal is funny, its a 4ycl but to get the tach to read correct i have to set it to 12 and 12 then 4 for squirts. I think its equivilent to 4injectors 4cyl and 2 squirts. Should i reduce it to 2 squirts then. And yes i am shooting for 600whp. You think that will fix my low pulsewidth and table problem.
Thanks

jsmcortina · Post by **jsmcortina** » Sun Apr 09, 2006 11:51 am

What is your tach signal ? That is certainly going to cause strange behaviour and ought to be fixed.
Try setting to 1 squirt. This will help a lot - with 4 squirts you are spending a lot of time opening and closing.

James

turbosl2 · Post by **turbosl2** » Sun Apr 09, 2006 11:57 am

my tach signal is correct now, the ecu outputs a funny signal, if i set it to 4 cyl it reads less then half of my actual rpm, this way it reads perfect. I will give it a try and let you know, prob wont be till later in the week. I apreciate your help. Would you mind if i contact you in PM if i am still having the issue?
Thanks

jsmcortina · Post by **jsmcortina** » Sun Apr 09, 2006 12:00 pm

Posting here is just as good because others can dive in and help or learn.

James

mops · Post by **mops** » Sun Apr 09, 2006 12:02 pm

if ve table doesnt go any lower, you have to decerase 'fuelREQ' (by whatever percentage you need), but that means you'll have to incerase all other ve entries to compensate to fuelREQ adjustment.

turbosl2 · Post by **turbosl2** » Sun Apr 09, 2006 12:06 pm

mops wrote:if ve table doesnt go any lower, you have to decerase 'fuelREQ' (by whatever percentage you need), but that means you'll have to incerase all other ve entries to compensate to fuelREQ adjustment.

I was orignally at 6.8, but it outputed 3.4 in the box below because of my setup. I tried changeing it to 3 which outputed 1.5 and it did move the graph up a little but not a huge amount. Even so it would still idle surge and either run 11s in the AFR or 1 percent leaner was bouncing from 14s-20s and surging. I am going to try what jsmcortina told me to do and decrease the squirts, because my pulsewidth as you can see from the datalogs is only 1.035 and goes as low as .8s
Thanks