1979-1993 & 94 Conv [Subscribe to Daily Digest] |
The LH 2.2 or LH 2.4 systems have great difficulty adjusting to more fuel. Whether you install blue top injectos and 3 bar fuel pressure regulator, or keep the stock 2.5 bar regulator and add T5 red top injectors from a 9000, either way you'll be adding more fuel than the stock computer system can compensate for. You'll have too much fuel at idle and lower rpms under 3K rpm. This wastes gas, fouls your catalytic converter, and you get sluggish performance to boot, until you get above 3K rpm and are really into some boost at that point where your car can actually USE all the fuel that is being delivered. The only way around this issue is to get a remapped fuel chip that will compensate for all the extra fuel, leaning out the mixture to get proper air/fuel ratios at all rpm and boost levels. I have not tried SD fuel chip, so I don't know where they have have air/fuel ratios set and with which injectors and at which fuel pressure regulator. Another chip is made by JAK stoll performance. Their chip is formatted for specific performance mods and if you deviate from them then things won't go correctly. The best is to have a chip custom tuned to your specific car, of course you have to go to JAK's shop or to SD shop. I believe MAPTUN can also reprogram a chip for you. So the point is; unless SD specifies their chip is to be used with certain injectors and certain fuel pressure regulator, then your air/fuel ratio is way off. Most who try the T5 red top injectors (from a 9000) have the same issues you are saying and either live with it or reduce to the blue top injectors. 3bar fpr and blue top injectors are 27# per hour, while red top T5 injectors and 2.5 bar fpr are 30# per hour. Unless you have all the big mods and a nice big upgraded turbo, you will need only the first chioce. And then again, w/out larger turbo, perhaps just a simple upgrade of the blue top injectors with stock 2.5 bar fpr will do. Talk to SD, find out what their chip compensates for. I've been their and done that, take it from my experience. I've spent time on the dynojet to measue air/fuel ratios.
posted by 65.125.1...
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