Chrysler Fuel Pressure Regulator - is it gonna cause more problems.

[Infidel Stroker]

OK. So I just picked up a '93 2-door xj and am going to swap out the 5" lift off my '89
I'm planning on stoking the engine ~ probably late fall.
But in the mean time, I like to wrench on things...

The previous owner had put in a MSD ignition upgrade (coil, wires, cap & rotor).
On my '89 RENIX, I had upgraded the pump and added Neon injectors. ** Someone suggested that the Neon injectors are designed to run at 40 psi not the stock 31... or whatever the '89 had (~ it ran fine) and were really a waist of money.
...I also have a high flow "cold air" intake. More to remove air flow restrictions than to do the cold air thing.

So, for the '93 mods that I'm going to do over the summer, I plan on swapping out the radiator, adding a high flow water pump, water inlet, and thermostat (which I'm told to go 180 deg).
Also going to swap the exhaust manifold with a long pipe, and lose the cat and muffler and go 2.5" from the manifold back...

*************************

Here's my question: I've read up on people dropping $$$$ to install an adjustable fuel pressure regulator to bump the psi upto 40+
I've also read that the Chrysler (caravan 93'ish) regulator is a direct swap and runs 40 psi idle.

Would it be worth the $35 to buy one from RockAuto?
Or would bumping the psi without adjusting the OBD1 computer readings?

[Infidel Stroker]

Funny how reading my post after it's posted makes me wonder if I'm paying attention when typing.
Plus, it makes me think I babble too much.

So the "in a nut shell" question is:
With higher air flow in and out, and a hotter ignition system...

Would it be good to pick up a 40psi fuel pressure regulator or stay with the stock regulator?


** AND what about after stroking the engine?
~ ported and polished head with chevy valves... and more aggressive cam, bored to .060 ...

[SilverXJ]

If you don't have a stroker yet do not mess with the pressure. None of your modifications necessitate even a larger fuel injector. Do you have a wideband AFR gauge?

[Infidel Stroker]

I have a fuel pressure gauge mounted on the fuel rail (permanently removed shrader valve) ...
I ordered a flow matched set of the Ford 710 injectors ($55) and will be switching the air intake to the 2000, and have an exhaust header on order.
Also looking at the 505 head with the 2.0 intake 1.#### exhaust, and a 62mm TB.
And around the time I install that, I plan on swapping out the cam and maybe (depending on condition) getting the cylinders bored out.

I just wasn't sure if it would be worth installing as I go / or if it would be an issue
...vs. waiting and doing the full system upgrade at 1 time.
= the drama of buying things piecemeal

[SilverXJ]

Fuel pressure gauge will only tell you your fuel pressure. You need a wideband gauge before you go changing pressure and installing not needed injectors. 505 is crap, I advise you to stay far away.

[Infidel Stroker]

What about the Titan head? Ported ~ LS1 valves...?

[Russ Pottenger]

What about the Titan head? Ported ~ LS1 valves...?

I do a LS1 valve ported head.

If you email me I'd be happy to send you information on my ported heads.

Russ Pottenger
Bishop-Buehl Racing Engines
531 N. Lyall Ave.
West Covina, California 91790
(626) 673-2203
Email/PayPal: [email protected]

BTW,
There is a thread in this form on Edelbrock heads.
There might be some information there that might be useful

[SilverXJ]

You really need to do your research on the companies you are considering.

Russ would be the #1 option.

[rainman]

I have a 95 xj with a 4.6 running 40-49 psi fpr with neon/ 703 Bosch injectors.
If anything it runs a little rich at wot afr=12.1.
Otherwise it runs perfect.
I *should* try and lean it out at wot but have not got to it yet.