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

Fuel Injectors...

Thread Tools
 
Search this Thread
 
Old 05-30-2011, 03:39 AM
  #16  
marinesniper0318
Instructor
Thread Starter
 
marinesniper0318's Avatar
 
Join Date: Mar 2011
Location: Fort Lauderdale, FL
Posts: 248
Likes: 0
Received 0 Likes on 0 Posts
Default

Speedytoy, Well when you say basics I have done the following:

1) cleaned all grounds 12 if I remember correctly
2) changed oil and filter
3) fuel filter
4) spark plugs
5) replaced all fuses for new ones
6) changed diff fluid
7) changed tranny fluid
8) flushed radiator
9) air filter
10) paint buffed, waxed

Next is injectors, spark plug wires, ignition (caps and rotors) and A/C compressor clutch, fuel pump... again I am doing all the basics I can think of. If you have any other suggestions I would be happy to here them.

thx...
Old 05-30-2011, 04:17 AM
  #17  
Hilton
Nordschleife Master
 
Hilton's Avatar
 
Join Date: Jun 2006
Location: ɹəpun uʍop 'ʎəupʎs
Posts: 6,285
Received 55 Likes on 45 Posts
Default

Originally Posted by marinesniper0318
If you have any other suggestions I would be happy to here them.

thx...
Replace all your rubber fuel lines. At the least, do the four in the engine bay which are all running at circa 55psi.
Old 05-30-2011, 10:59 AM
  #18  
SeanR
Rennlist Member
 
SeanR's Avatar
 
Join Date: Apr 2006
Posts: 35,700
Received 501 Likes on 267 Posts
Default

There are a lot more things to replace in the intake to make a smooth running car. Such as 20 year old fuel lines, 20 year old rubber hoses, 20 year old rubber vacuum line connectors, 20 year old throttle position sensor, 20 year old idle stabilizer valve, 20 year old crank position sensor, 20 year old knock sensors.

You also might need to change the Hall sensor.
Old 05-30-2011, 11:02 AM
  #19  
Mrmerlin
Team Owner
 
Mrmerlin's Avatar
 
Join Date: May 2004
Location: Philly PA
Posts: 28,416
Received 2,546 Likes on 1,429 Posts
Default

What Sean said!!
Old 05-30-2011, 11:17 AM
  #20  
blown 87
Rest in Peace
Rennlist Member
 
blown 87's Avatar
 
Join Date: May 2006
Location: Bird lover in Sharpsburg
Posts: 9,903
Likes: 0
Received 2 Likes on 2 Posts
Default

Originally Posted by SeanR
There are a lot more things to replace in the intake to make a smooth running car. Such as 20 year old fuel lines, 20 year old rubber hoses, 20 year old rubber vacuum line connectors, 20 year old throttle position sensor, 20 year old idle stabilizer valve, 20 year old crank position sensor, 20 year old knock sensors.

You also might need to change the Hall sensor.
That is a very good start.
Old 05-30-2011, 11:18 AM
  #21  
blown 87
Rest in Peace
Rennlist Member
 
blown 87's Avatar
 
Join Date: May 2006
Location: Bird lover in Sharpsburg
Posts: 9,903
Likes: 0
Received 2 Likes on 2 Posts
Default

The N2O will have it's own fuel system, no need for bigger injectors to run with N2O.
But by all means, by the 24's if you are going to buy a sharktuner, but then you are getting into a whole different set of issues.
I really think you need to get the car in 100% stock running condition before you even dream about a power adder of any kind.

The 19's on a S4 will be fine with a X pipe and a sharktuner.
You have to have a good solid engine to start tuning, and unless some one has all ready done your intake there is going to be a lot of things that are going to need to be replaced first.

Originally Posted by marinesniper0318
I want to add 125 shot nitros (or so) in the future , thus the reason for the 24lb injectors. The car runs good, it just seems to idle a little low (which would cause the sense of roughness)...around 600RPM or so...it does not overheat, everything else seems ok. I am planning on buying a shark tuner soon...

If I purchased said injectors from Rog I would prefer the 24lb'ers as I have moded my exhaust, I am going to introduce nitros and am going to buy the Sharktuner.

And yes Snipers have a plan when it comes to living breathing targets and avoiding detection : ) ... cars on the other hand is a different story, I am out of my element, like an overweight Russian soldier drinking Vodka all day...thus the reason for all the simple silly questions.

I was driving a E92 M3 before I sold it to get my hands dirty with the 928...I have a Lexus as a back up and a 1198R if the backup fails : )

thanks for the input...
Old 05-30-2011, 12:49 PM
  #22  
Speedtoys
Rennlist Member
 
Speedtoys's Avatar
 
Join Date: Sep 2010
Location: Boulder Creek, CA
Posts: 13,582
Received 1,034 Likes on 623 Posts
Default

Originally Posted by marinesniper0318
Speedytoy, Well when you say basics I have done the following:

1) cleaned all grounds 12 if I remember correctly
2) changed oil and filter
3) fuel filter
4) spark plugs
5) replaced all fuses for new ones
6) changed diff fluid
7) changed tranny fluid
8) flushed radiator
9) air filter
10) paint buffed, waxed

Next is injectors, spark plug wires, ignition (caps and rotors) and A/C compressor clutch, fuel pump... again I am doing all the basics I can think of. If you have any other suggestions I would be happy to here them.

thx...

You have a red leather shift boot yet?


Thats important for stable idle too.
Old 05-30-2011, 12:49 PM
  #23  
John Speake
Rennlist Member
 
John Speake's Avatar
 
Join Date: Feb 2002
Location: Cambridge England
Posts: 7,051
Received 37 Likes on 29 Posts
Default

Nitro isn't something I know much about, but extra fuel that is needed when injecting NOS usally comes from an additional set of injectors with their dedicated NOS controller. If you stick in larger injectors in anticipation of NOS then off boost your fuelling will be unecessarily rich.

If you buy a ST2 sooner than later it will quickly tell you which sensors are not correct, and save you money with accurate diagnosis.
Old 05-30-2011, 12:53 PM
  #24  
Speedtoys
Rennlist Member
 
Speedtoys's Avatar
 
Join Date: Sep 2010
Location: Boulder Creek, CA
Posts: 13,582
Received 1,034 Likes on 623 Posts
Default

Originally Posted by John Speake
Nitro isn't something I know much about, but extra fuel that is needed when injecting NOS usally comes from an additional set of injectors with their dedicated NOS controller. If you stick in larger injectors in anticipation of NOS then off boost your fuelling will be unecessarily rich.

If you buy a ST2 sooner than later it will quickly tell you which sensors are not correct, and save you money with accurate diagnosis.
I suppose that when the gas flows, it could trigger a new map via the coding plug...
Old 05-30-2011, 01:02 PM
  #25  
John Speake
Rennlist Member
 
John Speake's Avatar
 
Join Date: Feb 2002
Location: Cambridge England
Posts: 7,051
Received 37 Likes on 29 Posts
Default

Originally Posted by Speedtoys
I suppose that when the gas flows, it could trigger a new map via the coding plug...
That's an ingenious idea :-) I think I would prefer a dedicated controller for both NOS+ extra fuel. I think the NOS requires large additional fuel ? i.e. very large injectors. Anyway, this is't really a NOS thread ......



Quick Reply: Fuel Injectors...



All times are GMT -3. The time now is 09:14 AM.