Slowly Losing Power...

[Dee 33]

Hey guys.

Just under a year ago I spent a nice dose of cash on my stock R33 Gts-t. Enough to net me a wonderful 240rwkw. Enough to light the tires in second when boost came on. A very healthy dose of power.

Now as I've had it in this state for almost a year, I've gotten used to the power. This is expected. But you know how sometimes you say to yourself "It doesn't feel as fast as it used to..." and you wonder if it in fact is as fast as it used to be.

I had my car in at Mercury getting a service/wheel bearing done and I asked them to throw it on the dyno.

Well I get back in to my car and see the dyno sheet waiting for me when I pick it up. Alas. My fears are true. My baby only pulled 200.6rwkw. I know something is wrong because I have enough mods that I should be killing that figure.

460hp T04e

Wolf3dv4

Fuel pump

FMIC

Malpassi

16psi

Full zorst

Taking a look at the power curve, it's perfect. It's one of the smoothest curves I've even seen and the car still runs flawlessly. No misfires, no choking at low revs, nothing... except for the fact that I've lost a ton of power somewhere on the way. I can guarantee it's not a difference in dynos either because my mate pulled 173rwkw in his S15 with just cooler, zorst and boost on the same dyno which is hell high for those mods.

So my question is, what could it be? The guys as Mercury noticed nothing when servicing the car and it's been a gradual loss of power. I know because even with bald tires on the rear I'm no longer losing traction when I used to.

The only thing I can come up with is that it might be my engine getting tired and so I'm planning on getting a compression test done. Would this probably be the issue? Worn rings or something? If so, am I actually looking at getting a full rebuild rather than just replacing some engine parts to get that compression back up?

Any help is appreciated. I was about to get cams and injectors done but I'd rather find the missing 40rwkw first...

[AdamsR33]

It would actually be harder to smoke 'em up with bald tyres because there is more rubber in contact with the ground, acting like a slick tyre. the tread is there only for when it rains so to channel out the water. Mate you might be heading in the right direction about compression, also don't forget the difference could be a number of things, fuel, temp, and different dyno, it only takes couple of differences and they all start to add up. hey keep us posted as i'm about to spend some cash on my 33 soon.

[blind_elk]

Is this on the same dyno that gave you the 240rwkw?

[warriorbrawl]

Yeah I had my car dynoed there recently (very happy with the service) but it seemed a little low on the power readout but same deal good power curve and ARF's.

It aint the coolest weather at the moment and that can be like 10-15 kw there. Maybe there dyno is a little on the low side.