I have been thinking my engine is on the way out for some time now.
I boosted my car at a little under 125k miles 3 years ago now with a vortech blower that I bought used. At first I made 340whp at 8.5 psi. Couple months later I bumped it up to 12.5 psi which made 406whp.

I now have over 181k miles on my stock motor. Under load I would get a lot of smoke out the back. I thought for sure my rings were on the way out. It als burns a little more oil than it used to.

Anyways I went t the Evans tuning meet yesterday and figured I'd hop on the dyno since I haven't for over 2 years now where I made 406whp.
Well yesterday I put it on and made 403whp. So with all those miles on the engine and 3 years/55-60k miles boosted its practically exactly the same power still.
I was quite I pressed and also shocked as I thought my motor must be losing a good bit of compression by now.

Think my engine should be good till 200k. I'm also impressed with how many miles the blower has been holding up. I bought it used and have 55-60k. Lies myself on it. At least 10k miles before I bought it.

Only things I've had to replace since I put the kit on are 2 coil packs and the clutch of course. Haven't touched the sc kit in ovr 2 years now whe I changed pulleys and belt.

Bottom line these motors are insane!

 

I'd be interested to hear what your compression comes back at. Just made a thread about compression checking my motor and getting a tune. Kind of bummed that my numbers came back off by 10 (225,220,215,220) I only have 65000 miles and 15000 of them boosted. Still a good motor but was expecting the numbers to be the same across the board.

 

Last time I did it they were 213-208-213-213

Ill do it again soon to make sure things are still pretty good in there.

 

I have 110,xxx miles on my ap1 and just did a compression test (220,222,219,218) and leak down (3%,7%,3%,5%) and i've been burning somewhere around 1-1.5 qts every thousand miles.

I would blow noticeable amounts of smoke under full throttle runs and sometimes after sitting at a stoplight where I had been downshifting and engine braking from highway speeds I could smell the oil burning from the exhaust and get a puff when I accelerated from said stoplight. In other words, under high manifold vacuum situations I would burn oil. Which is otherwise a very common symptom of bad valve guide seals.

I've been planning on buying an sos kit for sometime so I wanted to do ap2 intake retainers/keepers anyway, so I bought all the valve guide seals and did them all while I was in there. 4 of my retainers were cracked and the valve seals were obviously worn.

I've probably put about 50 miles on it now and I'm neither getting noticeable amounts of smoke under full throttle (i'm going to have to have someone follow me to confirm this, but I can't see anything from the driver's seat anymore) or any noticeable smell from the exhaust when stopping like I was before so I'm very happy with how its turned out so far.

Of all local higher mileage ap1s I know that are burning a lot of oil, I am definitely going to recommend replacing the valve seals.

 

numbers seem perfectly normal if not good. as long as your numbers are all within +/- 15 from each cylinder youre ok. of course the closer the numbers are, the better. im curious to know what mine are on my 03 with 55k miles

 

I know my numbers aren't trouble but I didn't expect much of a grab or any of a grab with the mileage that's on the car granted I've been boosted for 15k miles.

 

When I compression tested mine before boost I was a perfectly even 227 in each cylinder. A few off in cylinder 2 now but hardly and well within spec.

 

It was so cool to see your car put down the same power as it did years ago! Made me so proud to own this car!

There was a decent cloud of blue smoke while dynoing though, and I would recommend those valve guide seals. They should be cheap, kind of a pain to do.. but worth it.

Thanks again for the ride in your car!! I am trying not to cave at this SOS group buy they just announced... sigh. Haha.

 

Valve guide seals are definitely worth it and its an easy job if you have the proper tools. Don't even waste your time buying the cheapo spring compressor from autozone, etc. For the amount of time you have to spend grinding it down and for how long and frustrating it makes the entire job, just spend the $200 and purchase or borrow the snap on spring compressor kit. It'll make the job such a breeze and less stressful its worth every penny, even if you'll only ever use it once.

http://buy1.snapon.com/catalog/item....re&dir=catalog

I'm buying an sos kit right now haha. Its funny how perfectly they timed the group buy with my timing on prepping the car for boost.

 

Moddy, those numbers are fine. Clearly that motor is still strong