Discussion
Hi Everyone,
Just curious. In my experience of raising boost on turbochraged vehicles, colder plugs always helped to prevent pre detonation or misfire. If anyone has added any of the high horsepower chips, I will be getting mine from Sanj, have they done this mod. If so, what NGK plug did they use for the S4. Any help will be appreciated.
As a thought, I had a 375hp Conquest. I had added everything imaginable to this baby from extra injectors to ported and polished heads. Upon my last mod, the vehicle would missfire at boost levels in excess of 19psi and rpms above 3500. I couldn't find the problem so I sent it to the dealer to check the ignition and other related items. Of course, nothing was found wrong. So I inspected the plugs they were fine. I called NGK and they said try a colder plug and I did. Shabang, the problem was fixed. The baby was faster and upon speed shifts, it shot out some serious F1 style flames! For everyones info, in 1993, I was the west coast distributor for Trust Performance Products now known as Greedy. Can you believe there was law suits by using Trust as in Trust Fund. Oh well. Not into those japanese performance cars anymore.
Cheers,
Dindo
Just curious. In my experience of raising boost on turbochraged vehicles, colder plugs always helped to prevent pre detonation or misfire. If anyone has added any of the high horsepower chips, I will be getting mine from Sanj, have they done this mod. If so, what NGK plug did they use for the S4. Any help will be appreciated.
As a thought, I had a 375hp Conquest. I had added everything imaginable to this baby from extra injectors to ported and polished heads. Upon my last mod, the vehicle would missfire at boost levels in excess of 19psi and rpms above 3500. I couldn't find the problem so I sent it to the dealer to check the ignition and other related items. Of course, nothing was found wrong. So I inspected the plugs they were fine. I called NGK and they said try a colder plug and I did. Shabang, the problem was fixed. The baby was faster and upon speed shifts, it shot out some serious F1 style flames! For everyones info, in 1993, I was the west coast distributor for Trust Performance Products now known as Greedy. Can you believe there was law suits by using Trust as in Trust Fund. Oh well. Not into those japanese performance cars anymore.
Cheers,
Dindo
Hi,
Colder plugs are the solution to lowering the detonation threshold through increased boost or CR.
I raised my CR from 7.5:1 to 8.5:1 and upped the boost from 8PSI to 10PSI w/o an intercooler. I switched to a colder plug and never had an issue with detonation at all.
For those curious minds, the difference between a cold and hot plug comes from the shape and size of the ceramic insulator on the plug.
A larger more 'bold' insulator prevents heat from dissappating from the plug and it runs hotter (Hot Plug).
A smaller less 'bold' insulator allows the heat to better escape and the plug runs cooler (Cold Plug)
Hope this helps. Happy Motoring! Jim'85TE
Colder plugs are the solution to lowering the detonation threshold through increased boost or CR.
I raised my CR from 7.5:1 to 8.5:1 and upped the boost from 8PSI to 10PSI w/o an intercooler. I switched to a colder plug and never had an issue with detonation at all.
For those curious minds, the difference between a cold and hot plug comes from the shape and size of the ceramic insulator on the plug.
A larger more 'bold' insulator prevents heat from dissappating from the plug and it runs hotter (Hot Plug).
A smaller less 'bold' insulator allows the heat to better escape and the plug runs cooler (Cold Plug)
Hope this helps. Happy Motoring! Jim'85TE
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