garados

iTrader: (3)

My 03 IS300 has been supercharged with a powerdyne bd11a at 7 psi and controlled by an e-manage for about 12k miles over ~4 years.

Lexus did a compression and leakdown test on my car. Here are the results ...

Compression/leakdown percentage
#1) 140/22
#2) 145/20
#3) 155/15
#4) 155/15
#5) 150/17
#6) 155/15

From my little knowledge on the subject, the compression looks ok because the span is only 15 psi which keeps it with ~10% (15 psi) variation from a rough average of ~150psi. What makes me worried is that I read that a stock engine should be putting about 190 psi, but then again, this test was done at ~5000' ASL (above sea level) and an unknown engine temperature.

Now the leakdown ... shouldn't it be down in the 5-10% range?

Thanks for the insight!

SOHC_MShue

the leakdown numbers look pretty high. Did you check to see where it was leaking from and do you burn oil?

garados

iTrader: (3)

no burning oil ... and the Lexus techs didn't go too in depth with the test. The more I think about it, they probably didn't get the engine up to normal operating temperature before doing the tests.