Reflahed ECU's-please share experience
Thread Starter
Sponsor
builtZmotors
builtZmotors
iTrader: (21)
Joined: Jul 2004
Posts: 2,780
Likes: 0
From: Albuquerque, NM
Reflahed ECU's-please share experience
i'm awaiting my reflashed ecu...will be back here tuesday... 
for all of you who have modified/re'flashed the ecu..please share what you had done, what mods you have done to car-type of FI, etc..and any complications you may have encountered
THX
TODD
for all of you who have modified/re'flashed the ecu..please share what you had done, what mods you have done to car-type of FI, etc..and any complications you may have encountered
THX
TODD
Last edited by 350zDCalb; May 15, 2005 at 03:26 PM.
Thread Starter
Sponsor
builtZmotors
builtZmotors
iTrader: (21)
Joined: Jul 2004
Posts: 2,780
Likes: 0
From: Albuquerque, NM
I'll begin:
I have a built motor, with 9.0:1 CR, greddy tt, 550cc injectors, aam fuel system, currently running 16psi, pulling 8 degrees of timing at most
sent ecu out to have following done:
L Spec
raise rev limiter (not that i am planning to rev higher-just dont want to bounce of rev limiter)
remove governor (you never know when you need to go 170+mph)
rescale ecu to 440cc injectors--then i'll use e-manage to scale to the 550's (recommended by gq)
had timing map from #2 position (assuming this is the standard map that advances timing 25 degrees at max) copied to #3 position..kept #1 position untouched (this is one that retards timing-in the scenario of a bad tank of gas)
-the timing issue is what i am most curious about...i have heard of one member here reflahing the ecu a couple of times and unable to get the timing map issue resolved- the ecu kept advancing at a mere maximum of 10 degrees...
has anyone here had the timing altered, as i described, and checked it on a scan tool (obd2) to monitor how much timing was actually being applied? i will dyno my car tues night and monitor the timing...hopefully it will work as planned.
thanks for your help
I have a built motor, with 9.0:1 CR, greddy tt, 550cc injectors, aam fuel system, currently running 16psi, pulling 8 degrees of timing at most
sent ecu out to have following done:
L Spec
raise rev limiter (not that i am planning to rev higher-just dont want to bounce of rev limiter)
remove governor (you never know when you need to go 170+mph)
rescale ecu to 440cc injectors--then i'll use e-manage to scale to the 550's (recommended by gq)
had timing map from #2 position (assuming this is the standard map that advances timing 25 degrees at max) copied to #3 position..kept #1 position untouched (this is one that retards timing-in the scenario of a bad tank of gas)
-the timing issue is what i am most curious about...i have heard of one member here reflahing the ecu a couple of times and unable to get the timing map issue resolved- the ecu kept advancing at a mere maximum of 10 degrees...
has anyone here had the timing altered, as i described, and checked it on a scan tool (obd2) to monitor how much timing was actually being applied? i will dyno my car tues night and monitor the timing...hopefully it will work as planned.
thanks for your help
Built motor..9 to 1 compression...Nismo cams..Vortech T-trim SC...Havent had it to redline yet....11.5 psi at 6000rpm...hopen for 14psi at 7000rpm ...L spec flash and flashed for 550 injectors....No problems . Let us know how the timing maps work .
In case anyone was wondering, the reason I recommend a 440cc reflash, and then scale the rest of the way to 550's, is to avoid limp mode that can occur at 4700rpm when the ECU does a MAF voltage check. If it sees too much, you go into limp. Keeping a nice cushion between input and output MAF voltage (via injector scaling), prevents this from happening. You could also clamp the voltage a little bit lower at around 4500rpm, to clear the "check", and then back up after that. 
Not only can the ECU never see 5.0V, but it also has a check point, that needs to be much lower than 5.0V. Hope that helps.
Not only can the ECU never see 5.0V, but it also has a check point, that needs to be much lower than 5.0V. Hope that helps.
Originally Posted by gq_626
In case anyone was wondering, the reason I recommend a 440cc reflash, and then scale the rest of the way to 550's, is to avoid limp mode that can occur at 4700rpm when the ECU does a MAF voltage check. If it sees too much, you go into limp. Keeping a nice cushion between input and output MAF voltage (via injector scaling), prevents this from happening. You could also clamp the voltage a little bit lower at around 4500rpm, to clear the "check", and then back up after that.
Not only can the ECU never see 5.0V, but it also has a check point, that needs to be much lower than 5.0V. Hope that helps.
Not only can the ECU never see 5.0V, but it also has a check point, that needs to be much lower than 5.0V. Hope that helps.
Thread
Thread Starter
Forum
Replies
Last Post
Extreme Dimensions
Southern California
0
Sep 24, 2015 03:35 PM
