![]() I would have assumed that at around normal performance the ECU/Injectors should be able to maintain load? While the Blue line is displaying a more even and greater power curve the two PSIs remain pretty equal. Had another look at your graphs and finding it a little odd that the fuel seems to drop so drastically (pre FCD) on basically the comparatively stock perimeters. So.if you want to run more than about 12 psi you are going to have to do something electronic anyway (eg new computer or SAFC or fuel cut defender) Thanks mate for your helpful response, I noticed that the modest increase I gave it didn't necessarily equal the expected returns. ![]() ![]() This graph shows why the power goes down like crazy the stock computer was dumping in heaps of fuel (running rich) to protect the engine from what it assumed was an e dotted red line which is the air/fuel ratio on the stock computer. black line is after installing a fuel cut defender. Here's 2 graphs from my car in the old days.red line is stock (top line is power, dotted line is boost). So.if you want to run more than about 12psi you are going to have to do something electronic anyway (eg new computer or SAFC or fuel cut defender) The stagea ECU is very conservative and will quickly run very rich and reduce the timing you will notice this as more boost not making it go faster.and lots of black smoke. You'll find that the stock ECU starts to struggle long before the turbo itself is in danger (it will run to 14psi plus.probably.)
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