Rb25De Down On Power/over Fueling

[R32FREAKK]

hey guys

So im new to the skyline game, bought one a non turbo r32 with an rb25de swap about 2 weeks ago. it drove fine but felt a little slower then expected(thought it was normal as people have told me non turbo r32's aren't that fast). After driving for a week i decided to do a comp test on all the cylinders, it pulled 135 psi on all the cylinders :S i've read that its supposed to be 182 psi, can anyone confirm this? It doesn't feel engine doesn't feel really worn out, it doesn't stutter or have any rough spots, runs and idles fine. Im pretty sure its running really rich, as when i warm it up before i leave work it leaves a marks behind the exhaust on the ground and you get a bit of a fuely smell coming into the cabin(i've checked for splits in the fuel lines there aren't any).

I also find that it picks up faster when i roll on the throttle on instead of flooring it. i have a suspicion that the previous owner might have put a turbo motor in and just taken all the turbo gear off( is there a way of checking if he has done this?).

do you guys any idea what might be causing the over fueling/underpoweredness? is there a way of getting a little more power without dropping a new engine in or getting this one rebuilt?

any info is much appreciated

cheers guys!

[jhjones]

hey guys

So im new to the skyline game, bought one a non turbo r32 with an rb25de swap about 2 weeks ago. it drove fine but felt a little slower then expected(thought it was normal as people have told me non turbo r32's aren't that fast). After driving for a week i decided to do a comp test on all the cylinders, it pulled 135 psi on all the cylinders :S i've read that its supposed to be 182 psi, can anyone confirm this? It doesn't feel engine doesn't feel really worn out, it doesn't stutter or have any rough spots, runs and idles fine. Im pretty sure its running really rich, as when i warm it up before i leave work it leaves a marks behind the exhaust on the ground and you get a bit of a fuely smell coming into the cabin(i've checked for splits in the fuel lines there aren't any).

I also find that it picks up faster when i roll on the throttle on instead of flooring it. i have a suspicion that the previous owner might have put a turbo motor in and just taken all the turbo gear off( is there a way of checking if he has done this?).

do you guys any idea what might be causing the over fueling/underpoweredness? is there a way of getting a little more power without dropping a new engine in or getting this one rebuilt?

any info is much appreciated

cheers guys!

If it was turbo'd before there should be a hole or holes cut for the intercooler piping. Look underneath the airbox or pod.

[GTSBoy]

Also, if previously a turbo motor, then there should be an oil drain point under the exhaust manifold behind the engine mount.

Right now though you need to be aware of a few things.

1) It is easy to get the wrong result with a compression test. In that regard, low compression numbers do not necessarily mean that the engine is stuffed. Technique and quality of compression tester have an effect on the numbers you get out of it. You should get it to a mechanic to do a leakdown test as a better guide to the condition of the engine.

2) 135 psi is a little low even for a turbo motor. Getting the same number on all cylinders is already suspicious. Maybe there's something wrong with the gauge.

3) If it is worn and has low compression, that will make it run more smoothly. It is easier to turn over a loose motor. Engines get more grumpy and lumpy as the compression ratio goes up.

4) It is an old enough engine from a car that was probably not well loved/cared for (being a P plater special). So it is likely that the O2 sensor is stuffed (would result in poor fuel consumption and not so nice transition from cruise to making power). It is also quite possible the AFM is in sad condition. This is the one most likely to cause your various problems. The coolant temp sensor could also be faulty and causing rich running. Check these things, even if you do nothing more than swaptronics with the AFM, it's better than simply wondering why it does what it does.