General > Naturally Aspirated Tuning

Best tune for this setup

<< < (2/2)

munich.marauder:
I'm putting together something similar, an M52B28 bottom end with a M54 ZHP intake cam (248 degrees, 10.0mm lift) and an S50 exhaust cam (240 degrees, 9.7mm lift), but I want to run the M52 manifold for the half-dozen extra torque in the 3000's (don't get over 4800 RPM very often).  I can run a 3.5" HFM if needed, but would think the 3.0 stocker would be just fine (bonus question: does the over-sized HFM actually affect the tune or have provable results on the dyno?).  I've also got M52 tubular headers and an aftermarket cat-back exhaust, and pink top 21.5# injectors. 
My main question is this: what changes do I need to be making in timing and fuel to switch that tune (M52 OBD1 Manifold 21 Lb Inj 3-5 MAF) from the OBD1 intake manifold to the OBD2 manifold - or any other tune from the OBD1 to OBD2 intake?

millerperformance:
You can use the 3-5 tunes OR the stock M50 or stock S50 performance tunes as a starting point since you will need to make fuelling adjustments anyway to suit your cam and header mods. You really need a wideband air fuel ratio reading to know what to do with fuel. Some places may be fine, other spots may need more or less fuel, again, it is going to be specific to your setup and the only way of knowing is to know your AFR.

For the timing, you can probably get away with a few more degrees here and there. But, with timing, it is best done on the dyno as you can SEE the changes in power that you might otherwise not really feel on the street when you are doing a bunch of tuning. If timing changes are making a huge difference, you will feel it, but if a degree here and a degree there make 1 or 2 HP improvement, you won't feel that and won't know if your changes are making a difference.

Navigation

[0] Message Index

[*] Previous page