Ilsaw's QG18DE+T Dyno'd

  • Thread starter Thread starter llsaw
  • Start date Start date
Z33 clutch and brake pedals slip right on.
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The accelerator pedal however is an entirely different story unless you're on the S2 engine with drive by wire accelerator. Mine is the cable type hence had to get a custom accelerator pedal pad from Ultimate Pedals
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Replaced the selt tapping screws with some titanium countersunk bolts and nyloc nuts :D
 
Andrew Saw said:
Hi Dave,

Spark plug might be the same as VQ but I doubt the coil over plugs (COP)s are the same between the QG and VQ. The SR folks have a pretty good write up on the various ignition COP upgrades granted this is for SR engine but a lot of it is applicable to the QG

http://www.sr20-forum.com/tuning/26028-cop-coil-plug-pencil-coils-will-fit-fwd-engine.html

Write up on inductive vs CDI (capacitative discharge ignition)

http://www.sr20-forum.com/information-library/26073-inductive-coil-tech-coil-plug-cop-tech-more.html

I'm on Denso IK22 (NGK heat range 7) Iridium Power plugs btw.

If one is anal on retaining the stock inductive set up T.M. Works Japan can upgrade the stock Hitachi COPs but cost is ridiculously expensive.
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I'll do some digging and reading later when I get home.
I know someone was looking at using vq35de cop's on their qr25de, which gave me the idea.
Splitfire make uprated coil on plugs for the sr20det and the vq35de.

My problem is, I'm using a standard ecu. I did ring my tuner today and he confirmed my thoughts. He did back some of the timing off in the tune, as he felt the ignition system was starting to break down.
 
Gets very very hot in a turbocharged engine bay so any form of heat shielding will help..

DEI Titanium Turbo Shield turbo blanket
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Sikky Thermalnator inlet manifold thermal shielding gasket for QG18
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Andrew Saw said:
I still think QR25 COPs are possibly a better bet, anyway let me know what you come up with.
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The qr25 is what led me to this possible option.
I recall reading a thread on b15u where someone upgraded his coils using the vq35de cop's. unfortunately I can't find this thread again.
The only differences I recall were the mounting point and plugs. Which are pretty simple to fix.

The main concerns are the length and seals of the cop's.
 
I do not know how true but referencing my USDm Sentra technical service manual the voltage going to the ignition COP for QR25 is 0.1V at idle and 0.2V at 2000rpm. For QG18DE it is 0.3V at idle and 0.5V at 2000rpm. Don't know if the higher voltage from the QG18 ecu will cause issue to the QR25 COP.
 
my n16e almera workshop manual lists 0.1v at idle and 0.2 at 2000rpm for the qg18de, which is the same as what you have listed for the qr25de.
 
the 350z service manual lists idle at 0-0.2v and 2000rpm at 0.1-0.4v

the qg18/qr25 both list 4 ignition signals from the ecu, while the vq35 only lists 3. but i think this has to do with the ecu and different banks for the vq35.
 
very true.

i've done some more looking into it, and the splitfire (SF-DIS-102) system for the 07+ vq35de/hr looks like it has a very similar plug design/mounting points from the photo's i've looked at.
theres a bloke here on the pulsar group of australia who is local and has an 09 350z. i'll be sending him a message to see if theres a chance i can compare the coils. as long as the length and seal are good, mounting points and wiring shouldnt be too difficult to overcome.
 
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