i will try to do mine soon, ive already been warned by the apartment complex for doing the suspension in the parking lot lol.

Hi John , Any news?

Hey Ash, still workin'! Yours is in the group to ship tomorrow. Once I have that group out then I'll be caught up. :-)
-John

Hey john,

gb is running smooth... any idea what group i am in and an a eta on shipping


hybrid from rx7 club

got mine monday,

was used monday night. not by me or with me there, but it worked like a charm..

great job john! :)

beers :beer:

Do not forget me......:squint:

So Phill didi you get a chance to use it yet?

No not yet, having problems. See your PM. Ray should be up soon and I'll try it then. If yours is going to be a while, let me know.

Indeed it was!

Thanks :)

has it been compared to the Mazda tester yet?

has the eagle landed yet? I would like a test plzzzzzzzz :)

Money sent, along with custom message :)

BLUE LCD please.

-Jon

Hi John,

Just tracking my TR-01...

Taken 6 days since you posted it to arrive here..!!!!

International Dispatch, May 27, 2009, 8:16 pm, FOREIGN CENTERJERSEY CITY NJ 099

I got a Filtermag from the US in 7 days to my door.

Sometimes you just can't work it out?

I guess it will arrive when it is ready to ;)

I don't know about Australia, but a cool thing I noticed about Canada is that once it crosses the border, the tracking code for USPS works on CanadaPost's website, and they have more detail about where it is compared to USPS.... So check your local post website and see if the tracking code works there...

I'm thinking mine's in a batch that hasn't been -made- yet, lol. It would be nice to get the list on the first page updated so I can figure out how many are before me :)

-Jon

I'm sorry to hear it's taking so long Ash, I hope it gets there soon!

You are correct Jon, building in progress. :-) And I'm not able to edit the first post any longer to update it so I kinda just gave up on it.

-John

This thing still goin' on?

B

Got mine today, thanks man!

Got mine too this morning Down Under...Thank you John!
Ash

OK, John and Anyone else..

Even though my car is still new (6 months) I plan on doing a Compression Test annually and making a record of the results, PSI, Rotor, mileage and date, etc.

I think every year would be enough...what do you guys think, Please?

So, if I run my Test on Rotor 1 and get 115,114,115 at 280 RPM, I then have to do the conversion factor of times 1.039, I hate math!!!!..

So 115 time 1.039 = 119.48 or say 119 PSI for the RENNY RX-8 Rotary.

Is this correct guys??

Then obviously do the #2 Rotor (rear)..

Thanks in advance..
Ash

Absolutely!

Good to hear!

Your math is just fine Ash, that's exactly right. To finish your example it'd be:
Rotor 1, Face 1 - 115*1.039=119.48psi
Rotor 1, Face 2 - 114*1.039=118.44psi
Rotor 1, Face 3 - 115*1.039=119.48psi
And repeat for rotor 2 like you said. :)

-John

Hi all,

I tested the tester today against the Mazda factory one.....
The results are a bit confusing.

Here are the results, can someone please double check the math behind it??? I do not seem to get accurate numbers.

TR1 test, Rotor 1
RPM: 298
Face 1, 112
Face 2, 113
Face 3, 113

Rotor 2
RPM: 305
Face 1, 109
Face 2, 113
Face 3, 110

After applying the correction factor (1.039), and converting PSI to kPascal (1 PSI = 6.894 kPa), we get approximately:

Rotor 1
RPM: 298
Face 1, 112*1.039*6.894 = 802 kPa (rounded)
Face 2, 113*1.039*6.894 = 809 kPa
Face 3, 113*1.039*6.894 = 809 kPa

Rotor 2
RPM: 305
Face 1, 109*1.039*6.894 = 781 kPa
Face 2, 113*1.039*6.894 = 809 kPa
Face 3, 110*1.039*6.894 = 788 kPa

Now converting the first rotor with a correction of -90 kPa (because of higher revs) and the second rotor with -101 kPa (both found in a table from the Greek RX8 Club), I get the following final numbers....

Rotor 1
RPM: 250 (corrected)
Face 1, 712 kPa
Face 2, 719 kPa
Face 3, 719 kPa

Rotor 2
RPM: 250 (corrected)
Face 1, 680 kPa
Face 2, 708 kPa
Face 3, 687 kPa

The original Mazda Tester (used about 3-5 minutes later than the TR01) showed:
Rotor 1
RPM: 250 (corrected)
Face 1, 570 kPa
Face 2, 610 kPa
Face 3, 670 kPa

Rotor 2
RPM: 250 (corrected)
Face 1, 680 kPa
Face 2, 720 kPa
Face 3, 710 kPa

My concern is not about the difference in the "faces" as it might be in the wrong order, but the fact that rotors seem to be way off.
Now the question.....if the math is correct, could the difference depend on a wrong measurement induced by not depressing fully the throttle?
I am asking because the Mazda test was performed by myself (I was cranking), while on the TR01 test, I was holding the tester while someone else was (maybe false) cranking......

Any ideas?

Regards,
George

So you converted the Mazda tester to kPa as well? Because IIRC the mazda tester measures in kg/cm2...

Can we get the original Mazda compression numbers, uncorrected in any way, along with the rpm at which they were measured?

Since we already have those for the TR-01, it might help to figure out where the issue is.

Jon

You are right.....
The corrected values are (in kPa)

Rotor 1
RPM: 250 (corrected)
Face 1, 559 kPa (5.70 kg/cm2)
Face 2, 598 kPa (6.10 kg/cm2)
Face 3, 657 kPa (6.70 kg/cm2)

Rotor 2
RPM: 250 (corrected)
Face 1, 667 kPa (6.80 kg/cm2)
Face 2, 706 kPa (7.20 kg/cm2)
Face 3, 696 kPa (7.10 kg/cm2)

!!!!!!!!!

Hello George,
Thanks for taking the time to compare both testers together and for posting up the results. I think your math looks just fine. The second rotor appears spot on after correction but the first rotor is way off. Just to clarify, you were holding the throttle open during the Mazda test, correct? A closed throttle would cause lower readings. Was only 1 test for each tester performed? Would it be possible to retest this same engine using both testers again?
-John

P.S. - Sorry, I had to convert your numbers to PSI to keep my eyes from crossing!! :lol: Just for reference, here's what I got:

TR-01:
Rotor 1
RPM: 250 (corrected)
Face 1, 712 kPa = 103.3 psi
Face 2, 719 kPa = 104.3 psi
Face 3, 719 kPa = 104.3 psi

Rotor 2
RPM: 250 (corrected)
Face 1, 680 kPa = 98.6 psi
Face 2, 708 kPa = 102.6 psi
Face 3, 687 kPa = 99.6 psi

Mazda Tester:
Rotor 1
RPM: 250 (corrected)
Face 1, 559 kPa (5.70 kg/cm2) = 81.1 psi
Face 2, 598 kPa (6.10 kg/cm2) = 86.7 psi
Face 3, 657 kPa (6.70 kg/cm2) = 95.3 psi

Rotor 2
RPM: 250 (corrected)
Face 1, 667 kPa (6.80 kg/cm2) = 96.7 psi
Face 2, 706 kPa (7.20 kg/cm2) = 102.4 psi
Face 3, 696 kPa (7.10 kg/cm2) = 100.9 psi

Ordered mine a few days ago but rx8club account was only approved now. Forum name is thewird on rx7club . I'd like to have the personal screen as "Did she blow it yet?". Also, I forgot to mention I wanted the green screen. Thanks.

thewird

Thanks but I would still like to know the uncorrected values.... not that I don't trust the correction table from the other club, I just think that if we find an issue that having the original values and rpms might be more helpful than corrected ones...

Jon

Jon,
I posted the uncorrected values in my first post....
Here they are again:

TR1 test, Rotor 1
RPM: 298
Face 1, 112 PSI
Face 2, 113 PSI
Face 3, 113 PSI

Rotor 2
RPM: 305
Face 1, 109 PSI
Face 2, 113 PSI
Face 3, 110 PSI

These are uncorrected.

The Mazda tool showed:

Rotor 1
RPM: 250
Face 1, 5.70 kg/cm2
Face 2, 6.10 kg/cm2
Face 3, 6.70 kg/cm2

Rotor 2
RPM: 250
Face 1, 6.80 kg/cm2
Face 2, 7.20 kg/cm2
Face 3, 7.10 kg/cm2

I will try to retest the same engine or another one, so that we get better "statistical" data.

Regards,
George

Oh, so you actually were cranking at exactly 250rpm for the Mazda one, that's what I missed. I thought you had corrected the mazda values to 250 as well.

Jon

Whats the lead time look like right now? There is a car meet on July first I'd love to have it for.

Payment sent!

dude,

straw and dixie cup for you.

:)

beers :beer:

hey john received the tool last week thanx :)

I did a test on my TII S4 , tested from leading plugs holes, throttle wide open with raw data readings

Front 248 RPM 86 85 85

Rear 237 RPM 72 74 73


what correction do i need to do?

spec is min 85 psi on a TII right?

hybrid

Hey Hybrid,
I'm glad you like your tester! For correcting those numbers you'd need to multiply the readings by 1.032. That's the correction factor for a S4 TII. This is what I got:

Front 248 RPM 86 85 85 (corrected 88.7 87.7 87.7)
Rear 237 RPM 72 74 73 (corrected 74.4 76.4 75.3)

Now, that doesn't take into account for the slower RPM. For that, we need to take a look at the FSM. Mazda put a graph in each FSM that shows how to compensate for low RPMs during the test. I've got the RX8 FSM downloaded, but can't find my '87 TII FSM at this moment. I'm going to look for it, or start downloading the digital copy and I'll post when I get it.
-John

This is low compression, on 250 rpm it will be:
Front 89.28 88.28 88.28
Rear 78.17 80.17 79.07

Minimum is 98.6 psi.

You need to re-do the test. According to the FSM compression tests have to be taken from the trailing spark plug hole. It makes a big difference.

Then you have to multiply by the correction factor posted here as well as correcting for RPM.

Jon

That minimum is for RX-8's, it is not correct for this car. The FSM for S4's states a minimum of 85. Here's a pic from the 86-88 FSM.

http://www.twistedrotors.com/images/..._Comp_Test.jpg

As for leading vs. trailing, I would agree and recommend to re-test from the trailing hole. Personally I don't think there will be much if any difference, but I have not tested the same engine from both leading and trailing so maybe I will learn something new. :)
-John

I'd like to add to keep in mind that the minimum's are just what Mazda recommends. Now for the RX-8 guys under warranty this is a big deal because they could get a new engine installed for free. For those of us that have never owned a rotary with any kind of warranty, then this number becomes subjective. Does your car feel strong? Does it start easily? If yes, then I wouldn't let these numbers bother you that much. The readings are even across the board and that engine may have quite a bit of fun left in it. If on the other hand you've been looking for a sign to drop-in that brand new bridge-port with the giant turbo, then this may be it. :)
-John

yep will redo the test this weekend and report back......but all in all a rebuild is on order

hybrid

Placed my order. I can't wait to get this.

PM sent
Money sent

Payments received! Thanks guys.


And if there's anyone on the fence about getting a tester now, there's only 6 days left at the GB price!! Get 'em while they're cheap!
-John

What's the status on current orders?

thewird

Assembly in progress. Got all the parts, now I'm putting 'em together. :)
-John

Weeeeeeeeeeeeeeeeeeeeeeeeeeee

this seems like a must have tool!

It is. ;)

-John

How's the next batch coming along?

Coming right along. :)
Boards are soldered, sensor modules are assembled....just have to finish machining the cases, mount the boards and screens in the case and close 'em up. :)
-John

any luck out there yet on a comparo with mazda's numbers???

So I figured I would show you guys what I have been working on. Anyone care to check my maths?

http://foxed.ca/Rx-7/rotarycalc.png

Is there time to include an order for mine as well ?