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12-15,000mi is a better interval.
Posted by EricG (more from EricG) on Thu, 6 Mar 2003 13:13:23
In Reply to: Starting improved, chris, Thu, 6 Mar 2003 12:02:02
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Others have posted in the past that shorter intervals will help prolong the life of the DI. At the very least I would regap at that interval, but with the price of plugs so cheap, it is just as easy to replace.
There has been a lot of discussion about gaps. 1.0-1.1 seems ideal for all performance charastics, but AeroGuy felt that 0.9 was better to preserve the life of the DI. He worked on the original DI configuration when Porche was developing it. Lucky for Saab they decided to drop the project and sold them the development. Saab tweaked from there.
In any case, 1.4 is way too big a strain on the system, as more voltage is required. DI failure is much more likely. However, the larger gap will give you better mileage as the bigger spark seems to burn the gas better. Don't think it is worth frying a DI though.
Be sure to use the NGK BCPR 7ES plug too. There is feedback to the ECU from the plug, and it is designed for the NGK plug.
Not a bad idea to pick up a spare DI if you are putting in those kind of miles. They can fail very abrubtly. Kachina had a blue DI they were selling a while back for $90. I bought one and it seems to work fine, and the bottom part looks all new. Someone posted a week or two ago about being able to buy the Bottom half of the DI for around $65. This is a great way to replace too, as that is usually the weak part. A new DI from the dealer goes for around $300.
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