z31.com

brentar976 · Posted: Sun Apr 25, 2010 7:45 pm Post subject: jwt 450 fuel problems

hey guys. I installed my jwt 450 kit today. seems like its getting to much fuel. Its hard to keep the engine running unless I unplug a fuel injector. I tried unplugging the o2 just to see if it would do anything but it didnt. Any ideas? thx for the help

SulphurTrail · Posted: Mon May 03, 2010 9:10 pm Post subject: Fuel Pressure?

What fuel pressure are you running and which injectors are you running. Also, did you install the drop resistors?
_________________
87 Jim Wolf 4 bar VG33 T66 Spearco 35shotN02 --Best: 13.1@114 Bandimere on stock internals with truck cams.

CrimsonPhoenix · Posted: Thu Jul 15, 2010 8:40 am Post subject:

I'm also curious about this....I plan to run the same setup for now. I heard you can use '75 Mercedes 450sel injectors with dropping resistors....fuel pressure I have NO clue about either.

NissanXrMa · Posted: Thu Jul 15, 2010 5:09 pm Post subject:

I'm currently running the JWT 450 kit. It sucks. AFR's are in the 10's at cruising. I've bought a afpr and i've been lowering the FP to 30 at 0 vac.

I've been getting 10 MPG. Why did i buy it? It was dirt cheap and i needed an EMS. I'm selling it and buying nistune.
_________________
1989 N/A Auto (Daily Driver)

1986 Turbo 5sp (Project) Exedy Clutch, Silicone Vaccum Lines, E-Fan, Intake, MBC,
Gutted Lexan Plenum, MSA 3 in exhaust catback, Test pipe,Custom Downpipe,
Satan relocation pipe. AiResearch T04b,JWT Tuning, 420cc injectors, Walbro 255lph

CrimsonPhoenix · Posted: Thu Jul 15, 2010 9:56 pm Post subject:

So that's two so far against JWT450. Anyone on here running it getting positive results? How did you install it, what type of power gains, supporting mods, mileage, etc?

The reason I asked is its pretty popular, so that must mean there are alot of ppl that are getting great results. I can't imagine some ppl getting shitty mileage and a bad tune and others having great results with the same product.

Steve88t · Posted: Fri Jul 16, 2010 5:35 pm Post subject:

You're doing something wrong then. I've used a JWT450 many years ago and got 20+ all the time. The fastest Z31's 10 years ago all used that setup with very little problems. I'll admit they are horridly conservative on tuning but that is expected in a part they sell over the internet.

Did you just put the new ecu in place? What maf and injectors are you using? Are you using the stock fuel pressure regulator?
_________________
http://z31.com/wiki/doku.php <- Don't be a lazy tard

CrimsonPhoenix · Posted: Fri Jul 16, 2010 5:57 pm Post subject:

CrimsonPhoenix · Posted: Fri Jul 16, 2010 6:07 pm Post subject:

With that upgrade should be:
1)ECU 88-89
2)420cc injectors
3)top feed fuel rail
4)'93 Cobra/'01 Lightning MAF
5)Z32 or Walbro 255lph fuel pump
6)Rid of the "injector campaign"
7)Boost controller
8)Dropping resistors
9)Intercooler is optional under 10psi?

Is that correct? I heard you can use the Bosch 11mm injectors or the ones from a 1975 Mercedes 450sel and buy an injector gasket kit for like $20 before you install them.

What am I missing here??

Steve88t · Posted: Sat Jul 17, 2010 9:52 am Post subject:

CrimsonPhoenix · Posted: Sat Jul 17, 2010 10:38 am Post subject:

I've read their site, and even tried to email them about it. I'm just trying to piece it together now. Got a good deal on the ECU and injectors, trying to find a good MAF. The intercooler I'll probably have to have custom made, as I can't find one and don't trust ebay very much.