New2G
Probationary Member
- 8
- 0
- May 22, 2011
-
Edmonton,
AB, Canada
Hi there, so I checked the other threads first in various forums regarding this issue, some of the ideas made sense but I am hoping for a fresh perspective.
Car has been modified with the typical steps...
Big16G turbo, all new lines/hoses
FMIC, removed side-mount, new piping, re-circ BOV
Magnus Fuel rail and siemens deka 780cc injectors, new seals
Brand new fittings and lines in the engine bay pertaining to fuel system
adjustable fuel pressure regulator
ECMLink v 2.5
1-stage boost controller
255lph fuel pump
stock 2G MAF
Forced Peformance exhaust manifold, stock O2 housing
no gauges installed yet, pod will be installed after issue is figured out.
Now, originally I had leaky injectors and some fuel rail fitment issues. After upgrading the rail, fitting the injectors with new seals, etc. and all sealed up the car was ready to actually be started. It started but was a heck of a chore, would idle low, 4-5s delay in throttle, etc. I found out the tech who checked my work (I get everything double-checked as I'm paranoid) plugged two plug wires in, incorrectly. Remedied that, car was running _ok_ but still terrible throttle response, idled better.
I fooled around with ECMLink with a friend who's experienced doing it, could get it running, smooth revs up to 7k but under load was jerky as all hell. He has done many pre-lim tunes before with no issue. We took a look at the plugs, I stupidly got some NGK irridiums and kept the "stock" gap of 40-44 area. We bought new plugs as those ones were super black, gapped them correctly and then also re-did the battery ground.
Now everything was reading right, car would start right up. Much better response, ran better, fuel trim came to where we wanted it with the correct dead-time and global (it was dying before when we set it above 550cc and a higher global would only keep it running).
Before we get into an ECMLink discussion, I plugged in my old stock ECU and it behaves the exact same way, only a bit rougher and harder to start. ECMLink can now be eliminated from the issue.
New plugs, top of the line wires, injectors are minty, fuel pressure is correct, it's getting fuel and then some.
What are the other possibilities? The car dives under load, even feathering the gas it just glugs right down. Once you get above 3-4k rpm it "smooths" out and the car is somewhat "drivable" at 100kph with only a little bit of sporadic hesitation. This to me sounds like a MAF issue. Car didn't seem to spool very well either, this all to me sounds like airflow issue but I'm an amateur.
Hoping for some other opinions. Maybe do a boost/vacuum leak check on the car for anything I may have missed or became cracked as it was brittle from before when I was changing it? From there change to another MAF and see if that solves it? What if neither of those does it, are we looking at a spark issue maybe?
Car has been modified with the typical steps...
Big16G turbo, all new lines/hoses
FMIC, removed side-mount, new piping, re-circ BOV
Magnus Fuel rail and siemens deka 780cc injectors, new seals
Brand new fittings and lines in the engine bay pertaining to fuel system
adjustable fuel pressure regulator
ECMLink v 2.5
1-stage boost controller
255lph fuel pump
stock 2G MAF
Forced Peformance exhaust manifold, stock O2 housing
no gauges installed yet, pod will be installed after issue is figured out.
Now, originally I had leaky injectors and some fuel rail fitment issues. After upgrading the rail, fitting the injectors with new seals, etc. and all sealed up the car was ready to actually be started. It started but was a heck of a chore, would idle low, 4-5s delay in throttle, etc. I found out the tech who checked my work (I get everything double-checked as I'm paranoid) plugged two plug wires in, incorrectly. Remedied that, car was running _ok_ but still terrible throttle response, idled better.
I fooled around with ECMLink with a friend who's experienced doing it, could get it running, smooth revs up to 7k but under load was jerky as all hell. He has done many pre-lim tunes before with no issue. We took a look at the plugs, I stupidly got some NGK irridiums and kept the "stock" gap of 40-44 area. We bought new plugs as those ones were super black, gapped them correctly and then also re-did the battery ground.
Now everything was reading right, car would start right up. Much better response, ran better, fuel trim came to where we wanted it with the correct dead-time and global (it was dying before when we set it above 550cc and a higher global would only keep it running).
Before we get into an ECMLink discussion, I plugged in my old stock ECU and it behaves the exact same way, only a bit rougher and harder to start. ECMLink can now be eliminated from the issue.
New plugs, top of the line wires, injectors are minty, fuel pressure is correct, it's getting fuel and then some.
What are the other possibilities? The car dives under load, even feathering the gas it just glugs right down. Once you get above 3-4k rpm it "smooths" out and the car is somewhat "drivable" at 100kph with only a little bit of sporadic hesitation. This to me sounds like a MAF issue. Car didn't seem to spool very well either, this all to me sounds like airflow issue but I'm an amateur.
Hoping for some other opinions. Maybe do a boost/vacuum leak check on the car for anything I may have missed or became cracked as it was brittle from before when I was changing it? From there change to another MAF and see if that solves it? What if neither of those does it, are we looking at a spark issue maybe?
