Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

First scan after build

Thread Tools
 
Search this Thread
 
Old 08-13-2007, 05:14 PM
  #21  
Senior Member
Certified Car Nut
 
J Wikoff's Avatar
 
Join Date: Mar 2003
Posts: 12,433
Likes: 0
Received 2 Likes on 2 Posts
J Wikoff is on a distinguished road
Default

Has the fuel pressure been tested? I know my OEM pump will do 60 psi.

And why does the throttle percent only go up to 1%?
Old 08-13-2007, 05:21 PM
  #22  
Senior Member
True Car Nut
 
big_news_1's Avatar
 
Join Date: Jun 2004
Location: Glendale, AZ
Posts: 3,459
Likes: 0
Received 1 Like on 1 Post
big_news_1 is on a distinguished road
Default

How can the IPWs and trims be in agreement with such low O2 values? I think something else is amiss here. Isn't the O2 a big player in the tuning equation? Why wouldn't it be adding more fuel?

FWIW, when I did my cam the LTFTs were pegged at the maximum lean value because my tune wasn't giving enough fuel. It wasn't my fuel pump at all. I added an AFC and everything started to shape up as we dialed it in. I wouldn't assume the fuel pump is bad until it is tested and proven to be junk. You might just need some kind of fueling adjustment. I know the IPWs and trims are looking good, but I don't understand how those values can coexist with such low O2s. Seems weird to me.
Old 08-13-2007, 05:26 PM
  #23  
Senior Member
Certified Car Nut
 
J Wikoff's Avatar
 
Join Date: Mar 2003
Posts: 12,433
Likes: 0
Received 2 Likes on 2 Posts
J Wikoff is on a distinguished road
Default

And what should the IAC reading be, assuming you were at WOT?
Old 08-13-2007, 05:27 PM
  #24  
Senior Member
True Car Nut
 
Rogue's Avatar
 
Join Date: Jul 2003
Location: Westerville, Ohio 2000 Black SSEi
Posts: 6,127
Likes: 0
Received 1 Like on 1 Post
Rogue is on a distinguished road
Default

Tuning based on the narrowband is not a great idea. It is erratic and changes with heat. You should tune your car with a wideband sensor either on the street or preferably on a dyno. You should also put a fuel pressure gauge on the car to test the fuel pump. N/A cars can run leaner than boosted cars and you should probably shoot for a 12.5-12.8 A/F ratio.
Old 08-13-2007, 05:28 PM
  #25  
Senior Member
Certified GM nut
Thread Starter
 
TJ'sblackbonne's Avatar
 
Join Date: Dec 2002
Location: plattsburgh NY
Posts: 2,037
Likes: 0
Received 0 Likes on 0 Posts
TJ'sblackbonne is on a distinguished road
Default

the throttle % is my fault... i kept putting 100 in excel and it was defaulting to a 1 so i left it. As for the put, i am going high flow because i never know. I am paying probably half what most guys pay for a stock replacement.

As for the cam.... I was very worried i was not going to be able to drive the car until i got a custom chip, and so far besides the knock issue it has been perfect
Old 08-13-2007, 05:36 PM
  #26  
Senior Member
Certified GM nut
Thread Starter
 
TJ'sblackbonne's Avatar
 
Join Date: Dec 2002
Location: plattsburgh NY
Posts: 2,037
Likes: 0
Received 0 Likes on 0 Posts
TJ'sblackbonne is on a distinguished road
Default

Originally Posted by Rogue
Tuning based on the narrowband is not a great idea. It is erratic and changes with heat. You should tune your car with a wideband sensor either on the street or preferably on a dyno. You should also put a fuel pressure gauge on the car to test the fuel pump. N/A cars can run leaner than boosted cars and you should probably shoot for a 12.5-12.8 A/F ratio.
I totally agree and this is to get a baseline tune on the car. Once i get it decent i am going to just on a dyno and go from there. I am OBD 1 1/2 so my tuning choices are limited to one place. It is gmtuners.com. Ryan (the owner) told me to get this scan tool and get this data (i have a list of some valves he needs) and we would start there.

As for putting the FP gauge on the car... i am definently going to before i by a pump. But i know for a fact the fuel pump is old and makes a pretty loud whining noise (kinda sounds whining). Plus so far all the data i ahve collected seems to point to the fuel pump, but i will check it before i buy
Old 08-13-2007, 10:20 PM
  #28  
Senior Member
Certified GM nut
Thread Starter
 
TJ'sblackbonne's Avatar
 
Join Date: Dec 2002
Location: plattsburgh NY
Posts: 2,037
Likes: 0
Received 0 Likes on 0 Posts
TJ'sblackbonne is on a distinguished road
Default

Yea i can hear the pump, it is yea like... a moaning noise. I am going to get it on a gauge tomorrow
Old 08-13-2007, 10:21 PM
  #29  
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Likes: 0
Received 8 Likes on 8 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

TJ, any luck getting that FP tested today?
Old 08-13-2007, 10:25 PM
  #30  
Senior Member
Certified Car Nut
 
J Wikoff's Avatar
 
Join Date: Mar 2003
Posts: 12,433
Likes: 0
Received 2 Likes on 2 Posts
J Wikoff is on a distinguished road
Default

No more cracks about anybody. That'* not a request. It'* a statement.


Quick Reply: First scan after build



All times are GMT -4. The time now is 12:42 PM.