You can convert in/hg to psi. If your vacuum gauge is registering -20 in/hg. that is roughly 10 psi. So fuel pressure would be about -9.8 psi lower than the base, or 33.7 psi.

Fuel pressure should be 43.5 psi with the fuel pump on and the vacuum/boost reference line disconnected. If you want to verify that fuel pressure is increasing at a 1:1 rate, as it should, you need to apply a specific amount of pressure to the regulator and monitor fuel pressure. The easiest...

I agree that it is the customers responsibilty to make sure the car is in good condition before he brings it in for tuning.It's the tuners responsibilty to stop the session when he realizes the most important piece of the puzzle is not working correctly. It would be negligent to continue...

It's a TO4E 60 trim compressor, read the map, it's 50 lbs/min. The green uses a TO4E 50 trim compressor rated at 48 lbs/min and a 20g is also rated at 48 lbs/min.That's incorrect. There are a lot of variables involved, but basically the expansion ratio, and the related cooling effect...

You can use forged pistons on stock rods, but it requires a modification to the rod. Your machinist will have to bore the small end of the rod and install a bronze bushing, and dril an oiling hole for proper lubrication.Your cheapest option is to get 2g pistons and have the machinst bore...

Only the parts connected to the crankshaft with the clutch disengaged will affect RPM's between shifts. Crank, rods, pistons, cams, cam gears, flywheel, pressure plate, etc. Wheels, driveshaft, axles, etc will have no effect on RPM's between gears, but could help with acceleration, however, I...

You don't have cams listed in your profile and the HX40 is a 62 lb/min turbo. The frank 5 is 50 lbs/min. You will also be using a restrictive 7cm housing, which is going to create a lot of backpressure with that TDO6 wheel, excessive backpressure causes egt's to climb and lowers the detonation...

You should find a new tuner. Any tuner that would compensate for a failing part shouldn't be touching your car.

Without cams and an intake manifold, you will be lucky to reach 400whp.

Before you drive the car again you should probably do a compression test. It sounds like you overheated the engine pretty bad. It does sound like thermostat is not opening from your description.

http://www.dsmtuners.com/classifieds/4g63-dsm-parts-for-sale-1/injectors-safc-quaife-aeromotive-a1000-7395/

The stock bolts and gasket are under rated. I used to run 25 psi on 92 pump with a few different turbo setups. I don't think you'll have any issues going a little higher. As long as there are no pressure spikes (detonation), it will be fine.

AEM suggests mounting the sensor 18" downstream of the turbo. I would move the wideband O2 to the downpipe and install the factory O2 in its proper location.

What are you using for a vacuum source for the regulator?

I was referring to the front cover that houses the oil pump. It could be coming from the pan, there are two bolts that go in the oil pan that are shorter than all of the other bolts, if you put them in the wrong location it could leak. The short bolts go in the front of the engine directly...