Notices
928 Forum 1978-1995
Sponsored by:
Sponsored by: 928 Specialists

Skip while under partial load Data logs attached

Thread Tools
 
Search this Thread
 
Old 03-25-2008, 10:50 PM
  #61  
Tampa 928s
Race Car
Thread Starter
 
Tampa 928s's Avatar
 
Join Date: Dec 2006
Location: Tampa Florida
Posts: 4,089
Likes: 0
Received 6 Likes on 5 Posts
Default

I would like to find a way to log 12v on the computers to see if I am losing or dropping power. Innovate has the software for free and I have the logs and have been getting help from z. But if the Maf comes back and the skip is still there I'm running out of options. You could loan me your 30k data device
Old 03-25-2008, 11:21 PM
  #62  
Kevin Michael
Rocket Pilot
Rennlist Member
 
Kevin Michael's Avatar
 
Join Date: Apr 2004
Location: gettysburg pa.
Posts: 3,298
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by Tim Murphy
Kevin, your statement above is physically impossible for a number of reasons. The only thing that could bow the screen is pressure drop across it. If something was sucked into the intake and was trapped on the screen it would cause a lot of pressure drop and could push out the screen. If the top screen was still in place and the bottom one blew out then I would suspect that the screen was not installed properly.

Mark, I assume the screen is from the downstream side of the MAF? If so, it would not affect anything as long as it was not interfering with the throttle plate. If it was from the up
stream side I figure you would have found it when you removed the MAF. I'm surprised you didn't see it missing when you took the MAF out and sent it off for rebuild.
Tim , I will concede my point now that you have explained it. The only reason I ventured that guess was My screen got sucked into the maf after I blocked off the intake air hose with the car running one day when I was experimenting with something. Did you get my request for the chips? And is your PP acct. still the same?
Old 03-25-2008, 11:32 PM
  #63  
928drvr86.5
Rennlist Member
 
928drvr86.5's Avatar
 
Join Date: Jan 2005
Location: Dubuque, Iowa.
Posts: 1,663
Received 6 Likes on 3 Posts
Default

Originally Posted by Tampa 928s
I would like to find a way to log 12v on the computers to see if I am losing or dropping power. Innovate has the software for free and I have the logs and have been getting help from z. But if the Maf comes back and the skip is still there I'm running out of options. You could loan me your 30k data device
I see you are logging MAF voltage, is that input a typical 0-5v analog input? If so, you could just employ a simple voltage divider to condition the LH/EZF 12V to the LM-1's 0-5v input at a 3:1 ratio. In other words, the LM would see 1v for every 3volts on the LH/EZF power pins.

I am not familiar with the Innovate software, but you should be able to calibrate the corresponding LM-1 channel in Engineering units to the corresponding input voltages. So, if you have say, 12v pwr at the EZF/LH pins the voltage divider will apply 4v to the LM-1 input, with the LM-1 calibrated it should display 3v for every 1v at the input.

If i could loan you one of our units i would, but we are in a perpetual state of not having enough data equipement.

Last edited by 928drvr86.5; 03-25-2008 at 11:50 PM.
Old 03-26-2008, 09:19 PM
  #64  
Tampa 928s
Race Car
Thread Starter
 
Tampa 928s's Avatar
 
Join Date: Dec 2006
Location: Tampa Florida
Posts: 4,089
Likes: 0
Received 6 Likes on 5 Posts
Default

I sent off the Maf Monday to Injection labs and Keven has E-mail and call three times since then. I asked him to expedite the repair if possible and he received it Today at 10:00 A.M. He called me this afternoon and said he would get it out tomorrow. I asked him to let me know how bad it was and if it was the cause of my problems. Explaining that I would have time to go through other possibility's such as wiring ahead of time. I have plans of going out of town this weekend and wanted to do a preemptive strike. I am very impressed with his customer contact and he explained what he found. I am not sure what he meant but he said a normal Maf has some type of 40 rating when good and mine was at 140. He said this would do all kind of strange things. Keeping my finger crossed and hope this clears things up.
He had tried in the past to get on as a seller on Reenlist but mentioned he did not get the response he expected. I believe now he will try again, we can always use one more vendor, by the way its cost $175.00 with lifetime warranty.
Old 03-26-2008, 09:40 PM
  #65  
Giovanni
Race Car
 
Giovanni's Avatar
 
Join Date: Jun 2002
Location: Alabama
Posts: 4,269
Received 25 Likes on 19 Posts
Default

Originally Posted by Tampa 928s
I sent off the Maf Monday to Injection labs and Keven has E-mail and call three times since then. I asked him to expedite the repair if possible and he received it Today at 10:00 A.M. He called me this afternoon and said he would get it out tomorrow. I asked him to let me know how bad it was and if it was the cause of my problems. Explaining that I would have time to go through other possibility's such as wiring ahead of time. I have plans of going out of town this weekend and wanted to do a preemptive strike. I am very impressed with his customer contact and he explained what he found. I am not sure what he meant but he said a normal Maf has some type of 40 rating when good and mine was at 140. He said this would do all kind of strange things. Keeping my finger crossed and hope this clears things up.
He had tried in the past to get on as a seller on Reenlist but mentioned he did not get the response he expected. I believe now he will try again, we can always use one more vendor, by the way its cost $175.00 with lifetime warranty.
Kevin rebuilt my MAF last year. He glued the electric box upside down (wrong flow pattern). Oh well, MAF works great though.
Old 03-26-2008, 09:44 PM
  #66  
Tampa 928s
Race Car
Thread Starter
 
Tampa 928s's Avatar
 
Join Date: Dec 2006
Location: Tampa Florida
Posts: 4,089
Likes: 0
Received 6 Likes on 5 Posts
Default

Goe

Please explain, you mean the Connector portion?
Old 03-26-2008, 10:39 PM
  #67  
Giovanni
Race Car
 
Giovanni's Avatar
 
Join Date: Jun 2002
Location: Alabama
Posts: 4,269
Received 25 Likes on 19 Posts
Default

The whole part that the wire harness connects on the MAF, he connected it the wrong way. So the arrow points to the wrong flow path. I can take a pic tomorrow if you want.
Old 03-26-2008, 11:00 PM
  #68  
Tampa 928s
Race Car
Thread Starter
 
Tampa 928s's Avatar
 
Join Date: Dec 2006
Location: Tampa Florida
Posts: 4,089
Likes: 0
Received 6 Likes on 5 Posts
Default

Your making me nervous!
Old 03-26-2008, 11:10 PM
  #69  
928drvr86.5
Rennlist Member
 
928drvr86.5's Avatar
 
Join Date: Jan 2005
Location: Dubuque, Iowa.
Posts: 1,663
Received 6 Likes on 3 Posts
Default

Originally Posted by Giovanni
The whole part that the wire harness connects on the MAF, he connected it the wrong way. So the arrow points to the wrong flow path. I can take a pic tomorrow if you want.

I am not sure that it makes much of a difference. My car had the MAF in upside down when i bought it and it was running fine. I didn't notice a difference when i corrected it either.
Old 03-28-2008, 08:36 PM
  #70  
Tampa 928s
Race Car
Thread Starter
 
Tampa 928s's Avatar
 
Join Date: Dec 2006
Location: Tampa Florida
Posts: 4,089
Likes: 0
Received 6 Likes on 5 Posts
Default

Received my Maf today and found that the voltage that should be at 40 was more like 160. Kevin found that my driver circuit transistors were shot causing thermal runaway.
I still have a issue that started last week:
After a short drive the car will stall when getting off of the gas.
Old 03-28-2008, 08:41 PM
  #71  
Kevin Michael
Rocket Pilot
Rennlist Member
 
Kevin Michael's Avatar
 
Join Date: Apr 2004
Location: gettysburg pa.
Posts: 3,298
Likes: 0
Received 0 Likes on 0 Posts
Default

So the maf was a no-go?
Old 03-28-2008, 10:12 PM
  #72  
Tampa 928s
Race Car
Thread Starter
 
Tampa 928s's Avatar
 
Join Date: Dec 2006
Location: Tampa Florida
Posts: 4,089
Likes: 0
Received 6 Likes on 5 Posts
Default

No, Maf made the car start fine and idle good, I took it for a 5-Min drive so I need to check it out a little more tomorrow.
Could be a vacuum leak causing the stalling!
Old 03-28-2008, 11:08 PM
  #73  
Tim Murphy
Addict
Rennlist
Site Sponsor

 
Tim Murphy's Avatar
 
Join Date: Jan 2003
Location: Green Bay Wisconsin
Posts: 951
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by Kevin Michael
So the maf was a no-go?
I talked to Kevin at Injection Labs and he was surprised the car even ran with how far out the MAF was.

...
Old 03-28-2008, 11:16 PM
  #74  
Tim Murphy
Addict
Rennlist
Site Sponsor

 
Tim Murphy's Avatar
 
Join Date: Jan 2003
Location: Green Bay Wisconsin
Posts: 951
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by Tampa 928s
No, Maf made the car start fine and idle good, I took it for a 5-Min drive so I need to check it out a little more tomorrow.
Could be a vacuum leak causing the stalling!
Verify the idle switch is working. This will cause the car to stall.
Old 03-29-2008, 12:15 PM
  #75  
Tampa 928s
Race Car
Thread Starter
 
Tampa 928s's Avatar
 
Join Date: Dec 2006
Location: Tampa Florida
Posts: 4,089
Likes: 0
Received 6 Likes on 5 Posts
Default

Car started this morning would not idle until about 45 sec, than ran OK.
It still stalls when getting off gas.
Has a hard time seeking an idle on start up.
I can hear the idle switch clicking.


Quick Reply: Skip while under partial load Data logs attached



All times are GMT -3. The time now is 10:25 AM.