Notices
Series I Tech Garage The place to discuss anything technical about the RX-8 that doesn't fit into any of the categories below.

an RX8er's rebuild thread

Thread Tools
 
Search this Thread
 
Rate Thread
 
Old 07-05-2012 | 04:04 PM
  #1151  
houstonrx8er's Avatar
Thread Starter
what was I thinking
iTrader: (8)
 
Joined: Jun 2004
Posts: 2,408
Likes: 0
From: Converse, TX
well for you guys that know what your looking at see the log below (I apologize I havent figured out how to adjust the frequency of the log)

I think this is a slam dunk for fuel/air issue
Attached Files
File Type: pdf
First log with hesitation.pdf (578.9 KB, 95 views)
Old 07-05-2012 | 04:07 PM
  #1152  
houstonrx8er's Avatar
Thread Starter
what was I thinking
iTrader: (8)
 
Joined: Jun 2004
Posts: 2,408
Likes: 0
From: Converse, TX
oops the ignition lead time is off the page...if that is important let me know
Old 07-05-2012 | 04:22 PM
  #1153  
9krpmrx8's Avatar
SARX Legend
iTrader: (46)
 
Joined: Jan 2007
Posts: 33,786
Likes: 455
From: San Antonio, Texas
TX

Originally Posted by houstonrx8er
well for you guys that know what your looking at see the log below (I apologize I havent figured out how to adjust the frequency of the log)

I think this is a slam dunk for fuel/air issue

man, that is all over the place.

Can you change your live data to log time, RPM, AFR, LTFT, STFT, Mass airflow G/S, and then log for a 30 second interval at cruise?
Old 07-05-2012 | 04:32 PM
  #1154  
houstonrx8er's Avatar
Thread Starter
what was I thinking
iTrader: (8)
 
Joined: Jun 2004
Posts: 2,408
Likes: 0
From: Converse, TX
I didn't log STFT.....but here is a more consistent log at cruise...I am a data guy so I look at this kind of stuff everyday but if you scroll through and just watch the AFR you can use that as your mark.....if that makes any sense at all
Attached Files
File Type: pdf
The better log.pdf (1.55 MB, 141 views)
Old 07-05-2012 | 04:42 PM
  #1155  
houstonrx8er's Avatar
Thread Starter
what was I thinking
iTrader: (8)
 
Joined: Jun 2004
Posts: 2,408
Likes: 0
From: Converse, TX
I looked all over cobb's website...you will have to show me how to adjust the data log interval in the AP
Old 07-05-2012 | 04:47 PM
  #1156  
9krpmrx8's Avatar
SARX Legend
iTrader: (46)
 
Joined: Jan 2007
Posts: 33,786
Likes: 455
From: San Antonio, Texas
I don't think you can. I wanna see STFT, load, and throttle %. get rid of speed.

You seem to be running pretty rich for a bit. Also, did you let off the throttle during that log?
Old 07-05-2012 | 04:57 PM
  #1157  
houstonrx8er's Avatar
Thread Starter
what was I thinking
iTrader: (8)
 
Joined: Jun 2004
Posts: 2,408
Likes: 0
From: Converse, TX
I wouldn't say I "let off" per-say I was just cruising and hit the log button....the road wasn't particularly smooth.

I will update the log list and get some more logs tonight if I can
Old 07-05-2012 | 05:04 PM
  #1158  
9krpmrx8's Avatar
SARX Legend
iTrader: (46)
 
Joined: Jan 2007
Posts: 33,786
Likes: 455
From: San Antonio, Texas
Oh okay, hills will do that. try to keep them short, like 15-30 seconds. Finding a perfectly flat spot is surprisingly tough believe it or not.
Old 07-05-2012 | 05:09 PM
  #1159  
houstonrx8er's Avatar
Thread Starter
what was I thinking
iTrader: (8)
 
Joined: Jun 2004
Posts: 2,408
Likes: 0
From: Converse, TX
is there any particular speed or rpm or anything like that that is beneficial?

my other logs were done with the intent of capturing the whole RPM range under both low and high loads..... guess i was wrong
Old 07-05-2012 | 05:16 PM
  #1160  
9krpmrx8's Avatar
SARX Legend
iTrader: (46)
 
Joined: Jan 2007
Posts: 33,786
Likes: 455
From: San Antonio, Texas
Do them in 500RPM increments from 1000RPM up, 30 seconds each. It gets tricky

Do you have a good idle log with the car warmed up?
Old 07-05-2012 | 05:20 PM
  #1161  
9krpmrx8's Avatar
SARX Legend
iTrader: (46)
 
Joined: Jan 2007
Posts: 33,786
Likes: 455
From: San Antonio, Texas
Oh and if you have time.

Mixture and adaptation
Old 07-05-2012 | 05:28 PM
  #1162  
houstonrx8er's Avatar
Thread Starter
what was I thinking
iTrader: (8)
 
Joined: Jun 2004
Posts: 2,408
Likes: 0
From: Converse, TX
holy crap you want me to post all those?

I had an idle log but I cant find it, I will do that as well.

I iwll read that after dinner
Old 07-05-2012 | 05:33 PM
  #1163  
9krpmrx8's Avatar
SARX Legend
iTrader: (46)
 
Joined: Jan 2007
Posts: 33,786
Likes: 455
From: San Antonio, Texas
Just post an idle log first before you try all the others Consider this practice.
Old 07-05-2012 | 08:25 PM
  #1164  
houstonrx8er's Avatar
Thread Starter
what was I thinking
iTrader: (8)
 
Joined: Jun 2004
Posts: 2,408
Likes: 0
From: Converse, TX
ok so here are some logs....first is idle, 2nd is stationary but rev'd to 4k....third I had some idle issues so I hit log again
Attached Files
File Type: pdf
idle log.pdf (1,009.4 KB, 152 views)
File Type: pdf
neutral 4000rpm log .pdf (969.2 KB, 155 views)
File Type: pdf
idle issue log.pdf (884.3 KB, 177 views)
Old 07-05-2012 | 08:29 PM
  #1165  
olddragger's Avatar
Registered
iTrader: (3)
 
Joined: Apr 2004
Posts: 10,828
Likes: 38
From: macon, georgia
the first one was that a full throttle run?
It is was--you have problems.
what kind of intake do you have?
Do you have screens in the intake?
. Maybe some turbulence in there?
Its all over the place, lean in some spots and the grams per sec of air flow is low.
Old 07-05-2012 | 09:33 PM
  #1166  
houstonrx8er's Avatar
Thread Starter
what was I thinking
iTrader: (8)
 
Joined: Jun 2004
Posts: 2,408
Likes: 0
From: Converse, TX
I do not beleive so.
lovely
I have the AEM and yes I have the screens

does that mean the MAF is going bad?...should I look at its voltage?
Old 07-05-2012 | 11:51 PM
  #1167  
9krpmrx8's Avatar
SARX Legend
iTrader: (46)
 
Joined: Jan 2007
Posts: 33,786
Likes: 455
From: San Antonio, Texas
Your STFT's are off on the second idle log. It could be a slight vacuum leak.
Old 07-06-2012 | 02:49 AM
  #1168  
vukovi's Avatar
Registered
 
Joined: May 2012
Posts: 20
Likes: 0
From: Louisiana
AT tranny rebuild

Thanks, for the 2 1/8 measurement. duh... I bought a 750 lb engine stand from harbor feight for $45. Once the block is mounted the tourque issue should resolve itself and I can break it open. Ill update pics as I progress. Thanks for the 2 1/8 measurement refrence as all the other sizes have been in MM. Ill check sears tomorrow.

I am slso customizing my 3rd gen 4 runner while Im rebuilding the mazda I just ordered an in dash mountable CB and im working on mounting a coil over whip with possibly dual front/rear antenna. And illl be adding a state of the art 1 DIN reciever above it for a 2DIN stack with a stealth CB set up ranging over 20 miles... makes for a headache in keeping up with what the poopin crappin I am doing
Old 07-06-2012 | 07:47 AM
  #1169  
houstonrx8er's Avatar
Thread Starter
what was I thinking
iTrader: (8)
 
Joined: Jun 2004
Posts: 2,408
Likes: 0
From: Converse, TX
lol...is that cb the kind you can interfere with other peoples radios?....my buddy and I use to do that with his when I was in HS....funny as **** pull up next to someone and start talking to them through their radio

good luck!
Old 07-06-2012 | 07:48 AM
  #1170  
houstonrx8er's Avatar
Thread Starter
what was I thinking
iTrader: (8)
 
Joined: Jun 2004
Posts: 2,408
Likes: 0
From: Converse, TX
Originally Posted by 9krpmrx8
Your STFT's are off on the second idle log. It could be a slight vacuum leak.
so vacuum has slightly improved to 15psi.....I did find possible source the other day but it was a long shot and obviously didnt fix the issue

UIM is coming off again and I think I am just going to use your vacuum tester on every freaking line
Old 07-06-2012 | 08:09 AM
  #1171  
hoss -05's Avatar
Lucky #33
iTrader: (4)
 
Joined: Feb 2009
Posts: 2,851
Likes: 5
From: San Antonio, SARX Garage
Glad to hear it is improving.
Old 07-06-2012 | 08:28 AM
  #1172  
olddragger's Avatar
Registered
iTrader: (3)
 
Joined: Apr 2004
Posts: 10,828
Likes: 38
From: macon, georgia
vacuum 15 at idle? Then that would explain the grams per sec being on the low side.
Do you think it may be time for a compression test?
You have the aem air filter and screens so there shouldnt be any turbulence in the intake system bad enough to mess with the maf.
The grams per sec should never waver like that--it should be a steady increase as the rpm builds ( during wot) at least that is how I understand it.
Vacuum leak? I guess that is possible but I dont think thats it? Dont know for sure, but I would be surprised.
Interesting and appreciate your sharing.
Old 07-06-2012 | 09:07 AM
  #1173  
houstonrx8er's Avatar
Thread Starter
what was I thinking
iTrader: (8)
 
Joined: Jun 2004
Posts: 2,408
Likes: 0
From: Converse, TX
Originally Posted by hoss -05
Glad to hear it is improving.
I wouldnt say improving...things are going south

Originally Posted by olddragger
vacuum 15 at idle? Then that would explain the grams per sec being on the low side.
Do you think it may be time for a compression test?
You have the aem air filter and screens so there shouldnt be any turbulence in the intake system bad enough to mess with the maf.
The grams per sec should never waver like that--it should be a steady increase as the rpm builds ( during wot) at least that is how I understand it.
Vacuum leak? I guess that is possible but I dont think thats it? Dont know for sure, but I would be surprised.
Interesting and appreciate your sharing.
I am going to do a compression test next week if this weekend doesnt reveal anything.

I did do 3 logs on the way to work and the 5k log had the AFR's drop to 12.0 and then up to 15.2......that was at steady throttle. Is that a sign that there is not enough air?
Old 07-06-2012 | 09:19 AM
  #1174  
9krpmrx8's Avatar
SARX Legend
iTrader: (46)
 
Joined: Jan 2007
Posts: 33,786
Likes: 455
From: San Antonio, Texas
Wonky AFR's are not normal if you were on reasonably flat ground. A vacuum of 15 is not good if you are sure you don't have a significant vacuum leak, that is about where my last engine was when I was having trouble. I think a compression test is on order just so you can see what is really up.

I would contact Jose and see if he can do it personally to make sure it's done right.
Old 07-06-2012 | 09:49 AM
  #1175  
houstonrx8er's Avatar
Thread Starter
what was I thinking
iTrader: (8)
 
Joined: Jun 2004
Posts: 2,408
Likes: 0
From: Converse, TX
jose who? at ingram?


You have already rated this thread Rating: Thread Rating: 0 votes,  average.

Quick Reply: an RX8er's rebuild thread



All times are GMT -5. The time now is 06:52 PM.