Stock Fuel Pressure Regulator Install

[ALLeyesONmyGSX]

hey guys i was just working on my buddys 98 GSX and he has ridiculously large 950cc injectors along with a AEROMOTIVE Fuel Pressure Regulator--- hes pretty un-educated about it, and im wondering if i went back to the stock fuel pressure regulator, with stock injectors, would it be an easy swap out, or would you guys recommend me take it to a pro and swap out the fuel pressure regulator for a pretty low price... what parts are removed from the car in order to install the aftermarket fuel pressure regulator...

... for some strange reason when we took the spark plugs out and plugged them back in, the car would mis-fire, does anyone know the proper fireing order... ?


1 2 3 4 Coils
_ _ _ _
1 2 3 4 Spark Plugs

^ match them up accoring to proper fireing order... (ex: 1-1 2-3 3-3 4-2)

 

[bushy]

On a 1g I know the order on the coil is 4 1 2 3 from left to right.

4 is the cylinder all the way on the left

Dont bring it to a mechanic, it is not a hard job to swap out the afpr

 

[TSIMonsteR]

You shouldn't need to swap out the AFPR. Just set it to stock fuel pressure and put the stock 450s back in if you are that worried about. Better yet, I'll trade you my stock FPR and 450s for your AFPR and 950s... straight up trade!! Deal ?

 

[ALLeyesONmyGSX]

... good one, see the thing is that the car does NOT have a fuel pressure gauge, so i dont see how i would be able to set it at stock fuel pressure... i guess that leaves me with my only option to pop in the stock FPR and the 450cc injectors are 1g and 2g stock fpr the same, and is it worth tampering with, or should i take it to a mechanic ?

 

[andymoraitis]

1G and 2G fuel rails are different and therefore the FPR's are as well. If you need a guide on pulling the rail and injectors, we have a few in our tech section:

http://www.dsmtuners.com/forums/forumdisplay.php?&f=36

It's an easy job. Just make sure not to lose the injector rail spacers as these have a tendency to fall behind the intake if you don't hang on to them. It would be a good idea to RTV them back into the head during re-installation.

Good luck!

Andy

 

[oldman]

A fuel pressure gauge is only $25.

What kind of tuning device is he using for the 950s? What kind of problems are you guys having? Stock or upgraded fuel pump? If the pump is an ungraded one, simply swapping back the stock fpr will result in fpr overrun.

2g base pressure is 43.5psi vs 1g at 37.5psi so naturally the fpr's are different. We need more info to help you, who the heck would install an afpr without a gauge anyway? Are you guys even sure he has 950s? Give us more history of the car.

 

[ALLeyesONmyGSX]

so the car has a T3/T4 turbo - walbro 255 fuel pump, and 950cc injectors... as far as tuning goes, the car has a DSM link that doesnt seem to work because its "timed out".
the car was equipped with 950cc injectors when he bought it, and the previous owner kept the fuel pressure gauge. we need 2 pass smog and of course in order to do so, we need smaller (stock) injectors. when i installed the 450cc injectors and tried to turn the car on, it would turn on and misfire, it sounded like the spark plug wire order was wrong, so we double checked it and it was correct... while doing so we realized the FPR was regulated for the 950cc injectors and turned the knob a bit to screw around with the device. after we realized what we had done, we put the 950's back in and the car would turn on and die after about 15-20 seconds. so i concluded that in order for the car to properly run, we need the 450s and the stock FPR... would he need a FPR regardless because hes running a walbro 255? is my conclusion sensable or do you guys have any other approach to this.

 

[oldman]

so the car has a T3/T4 turbo - walbro 255 fuel pump, and 950cc injectors... as far as tuning goes, the car has a DSM link that doesnt seem to work because its "timed out".
the car was equipped with 950cc injectors when he bought it, and the previous owner kept the fuel pressure gauge. we need 2 pass smog and of course in order to do so, we need smaller (stock) injectors. when i installed the 450cc injectors and tried to turn the car on, it would turn on and misfire, it sounded like the spark plug wire order was wrong, so we double checked it and it was correct... while doing so we realized the FPR was regulated for the 950cc injectors and turned the knob a bit to screw around with the device. after we realized what we had done, we put the 950's back in and the car would turn on and die after about 15-20 seconds. so i concluded that in order for the car to properly run, we need the 450s and the stock FPR... would he need a FPR regardless because hes running a walbro 255? is my conclusion sensable or do you guys have any other approach to this.

This is what you need to do.

1. Install a fuel pressure gauge and dial down the base pressure to 43.5psi. And yes, the afpr is there because of the 255 fuel pump, not the larger injectors.

2. Troubleshoot as to why the link isn't working, ask the guy who sold you the car for access to the dsmlink forum and ask for help.

3. There are two options here which depend on your sucess in #2.

A. If you're able to fix your problem with dsmlink, keep the 950s and get a proper tune.

B. No go with DSMlink, re-install the stock chip into your ECU as well as the 450s.

 

[daren_p]

so the car has a T3/T4 turbo - walbro 255 fuel pump, and 950cc injectors... as far as tuning goes, the car has a DSM link that doesnt seem to work because its "timed out".
the car was equipped with 950cc injectors when he bought it, and the previous owner kept the fuel pressure gauge. we need 2 pass smog and of course in order to do so, we need smaller (stock) injectors. when i installed the 450cc injectors and tried to turn the car on, it would turn on and misfire, it sounded like the spark plug wire order was wrong, so we double checked it and it was correct... while doing so we realized the FPR was regulated for the 950cc injectors and turned the knob a bit to screw around with the device. after we realized what we had done, we put the 950's back in and the car would turn on and die after about 15-20 seconds. so i concluded that in order for the car to properly run, we need the 450s and the stock FPR... would he need a FPR regardless because hes running a walbro 255? is my conclusion sensable or do you guys have any other approach to this.

If the car was tuned properly those 950 injectors won't make any difference over stock. With DSMLink you can make those 950's act just like stock injectors, so unless the car isn't tuned properly or his fuel trims are way off, just swapping injectors won't help any. If he's running a 255 pump, yes you need to run an aftermarket fpr. Did you already fail the smog? Does he have cams if so what ones (as these could make you fail). There are a couple features in dsmlink that can help you pass. You do have the ignition on or the car running when your getting the time out error? Are you using a serial or usb port on your laptop?

Edit: Also if you are swapping just the injectors & not the ecu don't expect the car to run & if it does run you can do some serious damage since your dsmlink should be compensating for 950 injectors. If you put the 450's back in without swapping the ecu or changing the compensation (global setting) in dsmlink you will be running extremely lean.

 

[ALLeyesONmyGSX]

hey guys, is there any way to get rid of the DSM link entirely, and run it with an AFC because i have never worked with DSM link, but do have experiance with an AFC... on a side note, would the car run if i changed the FPR to the stock one, with stock injectors & the existing walbro 255 fuel pump... ?

 

[oldman]

hey guys, is there any way to get rid of the DSM link entirely, and run it with an AFC because i have never worked with DSM link, but do have experiance with an AFC... on a side note, would the car run if i changed the FPR to the stock one, with stock injectors & the existing walbro 255 fuel pump... ?

Go back and read mine and Daren's last post, all of your questions have already been answered.

 

[ALLeyesONmyGSX]

so im gonna install a fuel pressure gauge before i do anything and try to get the pressure back to 43.5 PSI and see what happens- it should all run fine, considering it still has the 950cc injectors... everything SHOULD be back to normal, correct ?

 

[andymoraitis]

Provided the compensation for the 950's is correct in DSM Link, yes, everything will run fine. Just make sure to set the fuel pressure with the vacuum line off while at idle.

 

[daren_p]

Have you ever disconnected the battery? If so the compensation may not be correct. If power is disconnected the eprom chip will revert to the origional burnt values. If he had the eprom chip origionally made for the 950's then all will be good but it was origionally made for another size then you won't run properly till you can get dsmlink working to adjust the global setting.

 

[ALLeyesONmyGSX]

im gonna go down to kragen tomorrow and order a fuel pressure gauge since i dont think they have them in stock... hook it up, and set the pressure to 43.5psi, then take it from there. is it easy / difficult to install a fuel pressure gauge, ive never done it. thanks for the help guys

 

[daren_p]

im gonna go down to kragen tomorrow and order a fuel pressure gauge since i dont think they have them in stock... hook it up, and set the pressure to 43.5psi, then take it from there. is it easy / difficult to install a fuel pressure gauge, ive never done it. thanks for the help guys

Yes, their simple to install. Your fpr should have a 1/8" npt port right, thats got a lug in it now. Just remove the plug (use rags, etc, to prevent the fuel from making a mess), put some thread selaent on the gauge (pipe dope), screw it in & obviously tighten it in with a wrench. Thats all there is to it. Start the car (or just turn on your fuel pump with dsmlink, if you get/got it working) and check for any leaks. If alls good, remove the vacuum line, plug the line & set the gauge to 43.5 psi.

 

[ALLeyesONmyGSX]

hey guys, would the DSM link reset to its stock settings if the battery has been disconnected for about a week... ? im afraid this may happen and ill get shafted and have to find someone who knows how to function & work with DSM link... thanks...

 

[daren_p]

hey guys, would the DSM link reset to its stock settings if the battery has been disconnected for about a week... ? im afraid this may happen and ill get shafted and have to find someone who knows how to function & work with DSM link... thanks...

2g's don't have the memory board option yet, so if you disconnect the battery you will lose any of the "custom" settings that have been done (that is if anything has been changed). When the battery is disconnected it will return to the eprom defult values that were burned onto the chip when he purchased it. If you can't get DSMLink to work, the only way you can tell what the default values were programmed as, is to contact the origional owner. Just because had it working with 950's when your friend got the car, doesn't mean that those were his default. For example he could have had the chip programmed for stock injectors, so if you try to run the car with the 950's, more then likely it won't run & if it did it would be extremely rich (which could do damage).

Best thing it to get DSMLink working so you know exactly whats going on. Its extremely user friendly, so don't worry about that. What all have you tried? I think you were getting a time out error? Is the laptop using a serial or usb port?

 

[TSIMonsteR]

There is a tech guide here about tuning with DSMLink. Check it out, I think it may ease your thoughs about it. Also, how have you actually determined that Link is in fact "not working"

 

[ALLeyesONmyGSX]

so heres the thing guys, if i go out and purchase a fuel pressure gauge, and set the pressure to 43.5psi w/ the afpr, am i still expecting the car to run with 950cc injectors? or should i expect the 450's to get the car running. i know nothing about DSM link, and have never used it before. when my friend took his car to get it tuned, the guy that was supposed to be tuning it hooked up the laptop and all he got was "connection timed out" my fingers are crossed that the setting he had for the 950cc injectors will still stand, and the car will properly run with the 950s and the pressure set at 43.5psi...

 

[steve]

Leave the fuel pressure alone and focus on getting a computer talking to the ECU.
The odds are far greater that you have lost the settings from disconnecting the battery than the AFPR changing it's setting, unless somebodys fingers were messing with it.

Did your friend get the laptop with the car or trying to start with a "new" one?

Steve

 

[boostedinaz]

You only have two options.

1. Get the laptop to work and "talk" to the ECU. At some point no matter what happens you will need this to work so why not do it now.

2. Email the Link guys and they can tell you what the burned setting are for the chip in the car. These are the values that if the battery was dead the chip would revert to. This will tell you if the chip is set for 950's. If it is, fire it up and see how it runs, if not then you have to use the laptop to adjust the ECU for 950's.

If this is a legit copy of Link and you had it reregistered then you should have access to the Link forums. There is a TON of info on every aspect of tunning and just general operation. It will also tell you common problems with error messages.

 

[TSIMonsteR]

^^^ agreed. If you get DSMLink up and working your life will be easier. Link is easier to use, goto www.dsmlink.com and read up on it a little. I think you'll be pleasently suprised by it

 

[ALLeyesONmyGSX]

so if DSM link resets to its stock, manufacturers settings since the battery has been disconnected for a week, would the vehicle run with stock 450cc injectors ? case being, i have no clue how to function the DSM link @ all, have never worked with it, nor have i ever been around anyone who HAS worked with it, laptop- negative- the tuning on MY car is done with a palm pilot and an AFC... tomorrow im gonna go 2 pep boys and buy the kid a fuel pressure gauge for $40, hook it up, and see how it goes... and suggestions/comments from personal hand experiances i should know about before attempting this fuel pressure gauge install? thanks guys

 

[boostedinaz]

so if DSM link resets to its stock, manufacturers settings since the battery has been disconnected for a week, would the vehicle run with stock 450cc injectors ? case being, i have no clue how to function the DSM link @ all, have never worked with it, nor have i ever been around anyone who HAS worked with it, laptop- negative- the tuning on MY car is done with a palm pilot and an AFC... tomorrow im gonna go 2 pep boys and buy the kid a fuel pressure gauge for $40, hook it up, and see how it goes... and suggestions/comments from personal hand experiances i should know about before attempting this fuel pressure gauge install? thanks guys

Again, we have no idea. Sorry but you don't seem to be listening to what anyone is telling you.

You HAVE to do a few things to find out that info, no one here can tell you that. Please read my post above this and follow those two steps. It may be set for 950's so that if the batteries dies it will default to that, however with out contacting the Link guys you will never know.

You keep saying that you have never used Link before and that is fine, but if you do to there site and read up a bit you will see just how much easier it is to use that an AFC and logger.