Compression Test PSI

cjr1881 · 08-05-2011, 10:41 AM

I am going to get my first oil change, I am at about 5300 mi. and I am going to get a compression test also for a baseline and to make sure the cylinders are perfect before I start modding for peace of mind. I bought it with 19 miles on it and who knows if some idiot mis-shifted while test driving so just want to be sure. Does anyone know what the numbers should be? I can't find anywhere, just that they shouldn't vary much. Anyone know the Psi. they should be at?

red6spd · 08-05-2011, 10:44 AM

I guess it cant hurt, but I dont think its needed. If one or more of the cylinder was loosing compression you would know about it.

Red__Zed · 08-05-2011, 10:56 AM

Quote:

Originally Posted by red6spd

I guess it cant hurt, but I dont think its needed. If one or more of the cylinder was loosing compression you would know about it.

o rly?

Red__Zed · 08-05-2011, 10:57 AM

Op, I dont know offhand, but you are looking for consistency rather than hard numbers.

red6spd · 08-05-2011, 11:06 AM

Quote:

Originally Posted by Red__Zed

o rly?

Uh yea

Red__Zed · 08-05-2011, 11:17 AM

Quote:

Originally Posted by red6spd

Uh yea

How's that? We've seen cars in all the time that put out bad comp/ld numbers and you'd never know it (until you run 15+psi). One of the f20 builds we did was laying down beast numbers despite awful comp numbers... It is very often not obvious until you add power.

cjr1881 · 08-05-2011, 05:39 PM

Yeah I was gonna have the oil change and compression test done at the dealership. One guy I talked to was good and gave me a price of $142.50 for the comp. test and he was supposed to call me back when he could schedule with a master technician to do it. He never did so I called back a few days later and another tech was giving me the run around telling me there was no need to get it done unless there was something wrong and that I would definitely know. I told him possibly, and he said "probably". Didn't care for that guys attitude and he couldn''t even give me a price and pretty much just didn't want to schedule me to have it done. I spend that much money on a car and want a test done for peace of mind and am willing to pay for it and he wasn't cooperative. So I am having it done by a local mechanic. I am having CAI and short throw shifter installed at same time as long as the compression is good.

08-05-2011, 10:41 AM	#1 (permalink)
cjr1881 Base Member Join Date: May 2011 Location: Hudson Falls, NY Posts: 75 Drives: '11 Black 370Z coupe Rep Power: 3	Compression Test PSI I am going to get my first oil change, I am at about 5300 mi. and I am going to get a compression test also for a baseline and to make sure the cylinders are perfect before I start modding for peace of mind. I bought it with 19 miles on it and who knows if some idiot mis-shifted while test driving so just want to be sure. Does anyone know what the numbers should be? I can't find anywhere, just that they shouldn't vary much. Anyone know the Psi. they should be at?

08-05-2011, 10:44 AM	#2 (permalink)
red6spd A True Z Fanatic Join Date: Apr 2010 Location: Long Island NY Posts: 3,261 Drives: 2010 Z Coupe M6 SPT Rep Power: 10	I guess it cant hurt, but I dont think its needed. If one or more of the cylinder was loosing compression you would know about it. __________________ 2010 Base+Sport 6spd: Stillen G3, FI Non-Resonated CBE, FI Non-Resonated Test Pipes, UpRev Tuned, Custom 24R Oil Cooler, JDM Rear Fog-OEM Harness. ???Whp ???WTQ (Will find out come spring time)

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
low vs high compression ratio for FI	Legz	Forced Induction	17	07-30-2012 11:50 AM
Variable Compression Ratio Piston-Crank System	theDreamer	Other Vehicles	4	06-09-2011 12:08 AM
MotorTrend First Test: 2009 Nissan 370Z test drive 4.7 sec 0 to 60 11.25.08	AK370Z	Nissan 370Z Photos / Spyshots / Video / Media Gallery	47	11-11-2009 08:06 PM
DIY Low Compression Pistons	MightyBobo	The Lounge (Off Topic)	15	09-04-2009 02:00 AM

08-05-2011, 05:39 PM	#7 (permalink)
cjr1881 Base Member Join Date: May 2011 Location: Hudson Falls, NY Posts: 75 Drives: '11 Black 370Z coupe Rep Power: 3	Yeah I was gonna have the oil change and compression test done at the dealership. One guy I talked to was good and gave me a price of $142.50 for the comp. test and he was supposed to call me back when he could schedule with a master technician to do it. He never did so I called back a few days later and another tech was giving me the run around telling me there was no need to get it done unless there was something wrong and that I would definitely know. I told him possibly, and he said "probably". Didn't care for that guys attitude and he couldn''t even give me a price and pretty much just didn't want to schedule me to have it done. I spend that much money on a car and want a test done for peace of mind and am willing to pay for it and he wasn't cooperative. So I am having it done by a local mechanic. I am having CAI and short throw shifter installed at same time as long as the compression is good.