compression results
07-29-2015, 10:39 AM
#76
Actually...
The 2004-2008 all came with 4.44 (all manuals, different gearing for the automatics, 4.3)
The 2009-2011 all came with 4.77 (all manuals, different gearing for the automatics, 4.3)
And again... the R3 is a 2009-2011 TRIM LEVEL. The only R3 differences were seats, suspension, and body work. Everything else is the same to other series 2s (2009-2011).
Please stop with the "R3 specific" drivetrain stuff. The drivetrain was identical for all manual transmission 2009-2011 RX-8s, regardless of whether or not they were R3s, Grand Touring, Sport, GS, CS, etc... there are all TIM LEVELS, of which R3 is one trim level. Nothing else is different.
The 2004-2008 all came with 4.44 (all manuals, different gearing for the automatics, 4.3)
The 2009-2011 all came with 4.77 (all manuals, different gearing for the automatics, 4.3)
And again... the R3 is a 2009-2011 TRIM LEVEL. The only R3 differences were seats, suspension, and body work. Everything else is the same to other series 2s (2009-2011).
Please stop with the "R3 specific" drivetrain stuff. The drivetrain was identical for all manual transmission 2009-2011 RX-8s, regardless of whether or not they were R3s, Grand Touring, Sport, GS, CS, etc... there are all TIM LEVELS, of which R3 is one trim level. Nothing else is different.
Do you have the 2009 spec sheet? The one in your other post is 2011. I started a tread here years ago when I was a Mazda parts manager when these 2009 specific changes came out. Maybe I mis-read the info I received on the gearing. All these years I was under the impression the R3 had the 4.77 rear and not the other models. Maybe that changed in 2010 and 2011?
Last edited by T-von; 07-29-2015 at 10:49 AM.
07-29-2015, 11:18 AM
#77
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Gravey, I'm really looking forward to seeing your results.
I continue to pass up RX8 R3s (well, only a few so far, but still) because they have low 7s on their compression test results. If that in fact is a number that could mean many years of a healthy engine still remain, I'll need to change my search criteria, I'm thinking.
I continue to pass up RX8 R3s (well, only a few so far, but still) because they have low 7s on their compression test results. If that in fact is a number that could mean many years of a healthy engine still remain, I'll need to change my search criteria, I'm thinking.
07-29-2015, 01:40 PM
#79
I am almost tempted to get my freshly rebuilt s2 compression checked... but I probably won't. I do plan to get a dyno done though, and then use track data and a follow up dyno to tell me if compression start to drop 
I very much doubt an s2 would normally read lower compression than an s1. There's nothing internal I am aware of to do that. I can believe that something on the lower end of the scale will work perfectly in day to day driving for a long time though. It might even improve a bit with some hard driving :-)
I very much doubt an s2 would normally read lower compression than an s1. There's nothing internal I am aware of to do that. I can believe that something on the lower end of the scale will work perfectly in day to day driving for a long time though. It might even improve a bit with some hard driving :-)
07-29-2015, 07:15 PM
#80
Water Foul
I have been tempted to have the compression checked on my 2011 with 32K hard miles on it, but my local dealer wants $250, and that is a bit rich to simply satisfy my curiosity. There are some other dealers farther away, but the logistics are a pain. Perhaps one day. In any case, there are no signs of low compression at this point.
07-29-2015, 08:00 PM
#81
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Do you have the 2009 spec sheet? The one in your other post is 2011. I started a tread here years ago when I was a Mazda parts manager when these 2009 specific changes came out. Maybe I mis-read the info I received on the gearing. All these years I was under the impression the R3 had the 4.77 rear and not the other models. Maybe that changed in 2010 and 2011?
https://www.rx8club.com/series-ii-te...s-i-ii-161665/
Spec decks for the other two Series2 model years attached.
R3 was just a trim level, and not one with any different drivetrain parts.
You could always call up a dealership and ask for the rear diff part numbers, or the part numbers for the internal ring and pinion for the 3 years. You will get 2 part numbers, one for automatic all 3 years, one for manual all 3 years. No trim difference.
07-29-2015, 10:39 PM
#82
No, no significant changes between 2009 and 2011, definitely not the drivetrain.
https://www.rx8club.com/series-ii-te...s-i-ii-161665/
Spec decks for the other two Series2 model years attached.
R3 was just a trim level, and not one with any different drivetrain parts.
You could always call up a dealership and ask for the rear diff part numbers, or the part numbers for the internal ring and pinion for the 3 years. You will get 2 part numbers, one for automatic all 3 years, one for manual all 3 years. No trim difference.
https://www.rx8club.com/series-ii-te...s-i-ii-161665/
Spec decks for the other two Series2 model years attached.
R3 was just a trim level, and not one with any different drivetrain parts.
You could always call up a dealership and ask for the rear diff part numbers, or the part numbers for the internal ring and pinion for the 3 years. You will get 2 part numbers, one for automatic all 3 years, one for manual all 3 years. No trim difference.
I stand corrected! Sorry for mis-directing the thread.
This is good to know because I'm actually in the market for a 2009 Rx8 to use as a dailey to accompany my NA 20b. I was avoiding the R3 model for reasons that don't exist.
07-30-2015, 10:59 AM
#87
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Yeah, looking forward to hearing results. I have two more RX8 R3s on my radar, and at this point, I'm not clear whether or not I should disqualify them from consideration if they have low 7s for compression results.
Last edited by mariohardleft; 07-30-2015 at 11:07 AM.
07-30-2015, 11:33 AM
#88
Honestly, I think a bunch of old farts bought all the R3s when they were new, then just scooted around town until they couldn't work the clutch or got bored, this of course caused them all to build carbon. Bet that if they let you, you could drive the **** out of one at a dealer, have them redo the compression test and it would come out several points higher.
07-30-2015, 11:38 AM
#89
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I have been tempted to have the compression checked on my 2011 with 32K hard miles on it, but my local dealer wants $250, and that is a bit rich to simply satisfy my curiosity. There are some other dealers farther away, but the logistics are a pain. Perhaps one day. In any case, there are no signs of low compression at this point.
I don't see how they can justify that, the job has a set number to it in the computer, they can't just make up an amount. The job takes maybe 30 minutes tops. Unless they are charging a ridiculous amount for labor which doesn't really make sense.
07-31-2015, 05:21 AM
#91
Honestly, I think a bunch of old farts bought all the R3s when they were new, then just scooted around town until they couldn't work the clutch or got bored, this of course caused them all to build carbon. Bet that if they let you, you could drive the **** out of one at a dealer, have them redo the compression test and it would come out several points higher.
Tends to happen with a lot of sports cars, I think. First, the people with money buy them because they're neat. Then they sell, and enthusiasts buy them and... drive them in a manner more consistent with their purpose.
07-31-2015, 01:34 PM
#95
Water Foul
Dunno. I called, and that is what the service manager quoted me. Of course, I could just take it to Rotary Performance and have it tested there.
08-01-2015, 04:25 PM
#96
Alright guys, are you ready for the results?
Drum roll please.....
Alright alright.....I'll get to posting now.
That 7.9 just had to be there....
2010 R3 23,xxx miles 37,xxx km's
So the adjusted values are:
Rotor 1 Normalized values
7.8
7.9
7.3
Rotor 2 Normalized Values
8.4
8.2
8.6
Oh and this test was done on a hot engine immediately after driving for around an hour.
Drum roll please.....
Alright alright.....I'll get to posting now.
That 7.9 just had to be there....
2010 R3 23,xxx miles 37,xxx km's
So the adjusted values are:
Rotor 1 Normalized values
7.8
7.9
7.3
Rotor 2 Normalized Values
8.4
8.2
8.6
Oh and this test was done on a hot engine immediately after driving for around an hour.
Last edited by Gravey; 08-04-2015 at 09:48 AM.
