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Compression numbers before tune

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Old Nov 18, 2018 | 07:20 PM
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Compression numbers before tune
Hey what’s up everyone, just bought a 2006 evo 9 with roughly 93,000 miles on the clock. Bought it of a random guy on craiglist without knowing the compression numbers. Did it last week and the numbers were 110 125 120 120. The car is in need of a tune. Contacted RRE a couple days ago and was told the numbers were low. The car has Cams, ID2000, double pumper, speed density, full exhaust, stock 9turbo, e85, ported intake/exhaust mani and a surge tank. Do I really need to save up for a rebuild ?
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Old Nov 18, 2018 | 07:58 PM
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Hey, alright on the purchase. Yeah, those no.s seem very low. But not quite sure the norm on a 90K engine?

Maybe a leak down should be done to really confirm the health status

In any event, welcome aboard & hope to see you active on our boards

(EvO9 owner) Joe

Edit. Heres a clip from the SM. Is 92psi the lower limit?
Last edited by MinusPrevious; Nov 18, 2018 at 08:08 PM.
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Old Nov 18, 2018 | 08:48 PM
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Try adding a cap of oil in the 110 cylinder and see if it goes up. I'm assuming those numbers were done with hot engine and WOT when cranking.
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Old Nov 18, 2018 | 10:24 PM
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Originally Posted by MinusPrevious
Hey, alright on the purchase. Yeah, those no.s seem very low. But not quite sure the norm on a 90K engine?

Maybe a leak down should be done to really confirm the health status

In any event, welcome aboard & hope to see you active on our boards

(EvO9 owner) Joe

Edit. Heres a clip from the SM. Is 92psi the lower limit?
Thanks a lot joe. Will do a leak down test as soon as possible
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Old Nov 19, 2018 | 05:55 AM
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Originally Posted by Larranaga

Thanks a lot joe. Will do a leak down test as soon as possible
You know whos good a the leak down is our new shop in Belflower (JRP)
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Old Nov 19, 2018 | 09:03 AM
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Sell those 2000's for $700, buy some 1000's for $300-$400. And bam, money for single map tune..
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