larger cam effect on tune ??

[never2muchboost]

Quote: Originally Posted by onthedwnlow

i know on my bc stage 3's needed massive amounts more fuel from 5600 up.....it went from like a 190 ish number to a 240 ish number.....and that was on 0-0

hey eric i just noticed that post, you know if you have any numbers on your fuel map at 240 youre modifiers are going to "electronically" run out of fuel

[onthedwnlow]

Quote: Originally Posted by never2muchboost

hey eric i just noticed that post, you know if you have any numbers on your fuel map at 240 youre modifiers are going to "electronically" run out of fuel

i think my highest number was 240........and idle was like 80

[never2muchboost]

Quote: Originally Posted by onthedwnlow

i think my highest number was 240........and idle was like 80

do a pull and log injector duty,it will be somewhere around 120% in boost.if your tune is good though its easy to fix.go in your fuel table and right click and view it in duty cycle.highlight the entire map and click copy then do this

fuel>advanced fuel>fuel trims>options fuel trims
then raise the ms/bit value up 15 then go back to the fuel table and view in duty cycle(which you should already be) and right click on the fuel duty cycle table and paste the old table over the one on the screen.this will lower the numbers and your tune will remain unchanged.

if you were at 240 after you change the msbit should be around 180,thats where you want to be on a 3 bar map.go do a log and at around 20 psi depending on your particular setup you should be around 85% duty cycle.

[onthedwnlow]

i will have to try that some time this week....there is a few more things i need to do to this tune too

i called aem and was trying to figure why my speedo at idle sometimes will read 10 mph and they told me to change a few values....and i have to figure out a few more things

[never2muchboost]

Quote: Originally Posted by onthedwnlow

i will have to try that some time this week....there is a few more things i need to do to this tune too

i called aem and was trying to figure why my speedo at idle sometimes will read 10 mph and they told me to change a few values....and i have to figure out a few more things

huh?!?

do yourself a favor and open your map and click file>compare and compare it to the stock map.see if you see anything related to vss..thats really weird and shouldnt happen unless it is an actual problem with your signal..you dont have any big stereo wires or anything that emits alot of rfi do you?

[onthedwnlow]

Quote: Originally Posted by never2muchboost

huh?!?

do yourself a favor and open your map and click file>compare and compare it to the stock map.see if you see anything related to vss..thats really weird and shouldnt happen unless it is an actual problem with your signal..you dont have any big stereo wires or anything that emits alot of rfi do you?

absolutly no aftermarket stereo wires.....it has done it since day 1 when i got this ems......its busarich's old unit.......it was fine in his car but i put it in mine and i have issues and even on the bone stock base map just modified for my injectors and little stuff this thing will bucks and jerk at low speeds less than 5% throttle cruising

edit*****on the dyno my car read 140 mph on the cluster and the dyno read 150 i didnt know if that has anything to do with anything

[never2muchboost]

well it isnt dead on accurate but it shoulnt be 10 mph at idle! very interesting though if you figure it out please let me know.just a longshot but do you have anyone else near you that has ems? i would say try to swap the jumper harness and see if it still does it

[onthedwnlow]

i actually need to look at the jumper harness......i think there is a problem with that......if i turn the key over to put the windows down then turn the key back off........come back 2 hours later and try to start the car the gauges wont work........and my a/c isnt working with the ems....i think i have a jumper harness connection issue

[lilmike0450]

Yea he has some one close all he has to do is ask....A little off topic but Jay when are you going to Florida??

[never2muchboost]

next month

[lilmike0450]

Damn it....thats a killer right there...

[onthedwnlow]

why?.....we are going to end up flying him up here anyway.....tune mine yours and a few others

[lilmike0450]

yea we could do that...just gotta have the money all at the same time...

[nutz]

Quote: Originally Posted by never2muchboost

i hpe im making better sense this time lol..sometimes its hard to put in words what goes on in my head

i have to visualize it to understand

trust me your explanation makes perfect sense

[darksrknight]

Quote: Originally Posted by never2muchboost

yes the overlap does help but there comes a point when there is too much overlap and backpressure dillutes the intake charge.this is why you can have too big of an exhaust cam with too much duration.if it stacks pressure the cylinder temps go up.that heats up the piston the edges of the piston get hot and preignite the fuel charge.that detonation bangs up against the flame front ..that is knock.this is basically what i was originally trying to get at although i didnt do such a good job of explaining it

This is one of the best post's I have read thusfar since joining this site. Amazing information! Thanks! It's amazing that a few words can give so much information. Post on please!!!!!