Notices
944 Turbo and Turbo-S Forum 1982-1991
Sponsored by:
Sponsored by: Clore Automotive

Vacuum leak causing low boost? (UPDATE: Still low boost, TPS?)

Thread Tools
 
Search this Thread
 
Old 03-25-2005, 09:20 AM
  #61  
danny951
Three Wheelin'
Thread Starter
 
danny951's Avatar
 
Join Date: Feb 2002
Location: Arlington, TX
Posts: 1,493
Likes: 0
Received 0 Likes on 0 Posts
Default

Well, Don Istook is now looking over the car and will diagnose accordingly. It may be the CV or could be injectors as the guys above have suggested. I've already replaced the FPR so it's not that (but could have been). And I'm sure several other things fuel related could cause the same problem.

I keep the thread updated though cause I'm sure others can benefit
Old 03-25-2005, 09:43 AM
  #62  
porshhhh951
Monkeys Removed by Request
Lifetime Rennlist
Member
 
porshhhh951's Avatar
 
Join Date: Feb 2003
Location: New York
Posts: 7,713
Likes: 0
Received 1 Like on 1 Post
Default

good to hear he is going to take care of it danny. Keep us updated.

BTW I got a late night photo shoot scheduled on thursday. Move outta the sticks so you can make it up. I want pics of our cars together.

Oh yeah and since I havent seen you in a couple of days. Please wash your freggin car already.
Old 03-25-2005, 09:59 AM
  #63  
danny951
Three Wheelin'
Thread Starter
 
danny951's Avatar
 
Join Date: Feb 2002
Location: Arlington, TX
Posts: 1,493
Likes: 0
Received 0 Likes on 0 Posts
Default

hahaha... yeah yeah.. i'll get her washed... Just been working on the inside so much, almost forgot about the outside!

photo shoot sounds good, what time and where?
Old 03-25-2005, 10:06 AM
  #64  
porshhhh951
Monkeys Removed by Request
Lifetime Rennlist
Member
 
porshhhh951's Avatar
 
Join Date: Feb 2003
Location: New York
Posts: 7,713
Likes: 0
Received 1 Like on 1 Post
Default

well thats the thing...it will prolly be late and at night. I know you prolly have work in the morning and since you would have to leave then and still head home. I assumed you prolly wouldnt be able to make it.

I will pm you details when I have something nailed down though. Crizo is a pretty good photographer and has so many cool little outta the way sites to take photo's at. The backdrops just look amazing at night with the lights.

They make great backgrounds for your car. So I contacted him because I want some really killer shots of my car. I need a new sig. hehe.
Old 03-25-2005, 10:39 AM
  #65  
danny951
Three Wheelin'
Thread Starter
 
danny951's Avatar
 
Join Date: Feb 2002
Location: Arlington, TX
Posts: 1,493
Likes: 0
Received 0 Likes on 0 Posts
Default

I'm sure I could make arrangements.. my wife has somewhat gotten used to my midnight poker games, just as long as it's not every night.. so I'm sure I could do it.
Old 03-25-2005, 10:43 AM
  #66  
porshhhh951
Monkeys Removed by Request
Lifetime Rennlist
Member
 
porshhhh951's Avatar
 
Join Date: Feb 2003
Location: New York
Posts: 7,713
Likes: 0
Received 1 Like on 1 Post
Default

sweet! Well I will let you know the details when I know.
Old 03-25-2005, 07:29 PM
  #67  
danny951
Three Wheelin'
Thread Starter
 
danny951's Avatar
 
Join Date: Feb 2002
Location: Arlington, TX
Posts: 1,493
Likes: 0
Received 0 Likes on 0 Posts
Default

Alright, got a call from Don, and he is seeing the timing is advanced about 2 degrees over the max spec at idle and 2500rpm. He also said at 4000rpm the ign timing is 41 degrees which he feels is a little agressive. The result? The car is running lean and he checked the spark plugs and they do show signs of detonation.

I told him the car still has the stock chips as far as I know (haven't put the guru's in yet) and he checked the fuel pressure and it's running around 44#'s (have the 3bar fpr) so that's okay. He put in some new plugs and checked ox sensor voltages as well as afm voltages which were right on the money. That's it for today really, he's going to work at it some more Monday. Just wanted to update you guys.
Old 03-25-2005, 07:32 PM
  #68  
NZ951
Race Director
 
NZ951's Avatar
 
Join Date: Apr 2003
Location: New Zealand massive
Posts: 13,778
Received 5 Likes on 3 Posts
Default

OMG! 41 degrees at 4,000? was that at WOT? Please say no.
Old 03-25-2005, 07:34 PM
  #69  
danny951
Three Wheelin'
Thread Starter
 
danny951's Avatar
 
Join Date: Feb 2002
Location: Arlington, TX
Posts: 1,493
Likes: 0
Received 0 Likes on 0 Posts
Default

I don't think so... I think he said there wasn't a spec at 4000rpm, but at 2500 it is like 33 +/- 5

Please explain..
Old 03-25-2005, 07:37 PM
  #70  
NZ951
Race Director
 
NZ951's Avatar
 
Join Date: Apr 2003
Location: New Zealand massive
Posts: 13,778
Received 5 Likes on 3 Posts
Default

This timing map has been "Link Knock Blocked" on pump gas.
Attached Images  
Old 03-25-2005, 07:39 PM
  #71  
danny951
Three Wheelin'
Thread Starter
 
danny951's Avatar
 
Join Date: Feb 2002
Location: Arlington, TX
Posts: 1,493
Likes: 0
Received 0 Likes on 0 Posts
Default

What do the kilo Pascal's represent? pressure in the intake manifold?

And I'm not sure what "Link Knock Blocked" means..

Old 03-25-2005, 07:41 PM
  #72  
NZ951
Race Director
 
NZ951's Avatar
 
Join Date: Apr 2003
Location: New Zealand massive
Posts: 13,778
Received 5 Likes on 3 Posts
Default

Well if you were running 41 ignition degrees advance, which is arond 51 total advance, on boost. Then your knock sensor would be going mental and timing would hopefully be pulled from the system. You would be detting VERY badly at that point...
Old 03-25-2005, 07:42 PM
  #73  
danny951
Three Wheelin'
Thread Starter
 
danny951's Avatar
 
Join Date: Feb 2002
Location: Arlington, TX
Posts: 1,493
Likes: 0
Received 0 Likes on 0 Posts
Default

so that would explain why my CV is telling my KLR to pull ignition back and my boost back, right. And that's why it would be bad to just pull my CV!

Old 03-25-2005, 07:43 PM
  #74  
NZ951
Race Director
 
NZ951's Avatar
 
Join Date: Apr 2003
Location: New Zealand massive
Posts: 13,778
Received 5 Likes on 3 Posts
Default

Originally Posted by danny951
What do the kilo Pascal's represent? pressure in the intake manifold?
Yup, its manifold absolute pressure (MAP). Bacisally its bar of boost taking into account atmosphere. So 200 is 1.0 bar of boost, 225 is 1.25 bar of boost, and so on.
Old 03-25-2005, 07:45 PM
  #75  
NZ951
Race Director
 
NZ951's Avatar
 
Join Date: Apr 2003
Location: New Zealand massive
Posts: 13,778
Received 5 Likes on 3 Posts
Default

A link knock block is a neat wee tool that plugs into the knock sensor and allows you to output the signal to headphones. So you can hear what the knock sensor picks up, not just an algorithum that the software interprets. So the timing I have set has ZERO detonation at all on pump gas.


Quick Reply: Vacuum leak causing low boost? (UPDATE: Still low boost, TPS?)



All times are GMT -3. The time now is 12:12 AM.