Fuel Injectors Must be Regulated

[20yearoldspider]

I've been advised the overkill fuel injectors recently installed on my '86 need to have a Motronic fuel pressure regulator from a '90-'94 Spider to keep the pressure down to a safe range (42-46 psi) or I run the risk of washing a cylinder with fuel and burning it up should an injector foul. Other related mods include a Gotech EFI system.

Here's the question(s)-where do I get one and can an idiot like me DIY?

[ddouglas77]

Try APEDIRECT.COM They should have the regulator. When you say an idiot like yourself, are you saying you don't like the new fuel injectors??? You should easily be able to do it, get a bigger cam and you won't need to regulate as much fuel as you'll be increasing the air/fuel flow into the engine and make proper use of said "overkill injectors". Is the Gotech EFI programmable? If so, you may just want to turn down the duration of the injectors in lieu of adding a different regulator, but it seems the advice you were given was a "fouled injector" worst case scenario, which could also happen even with a different pressure regulator, it regulates fuel in the rail, not at an individual injector, soo, ya, keep that all in mind. Have fun and drive hard!

[papajam]

Does the car still have the stock fuelpump?
Memory tells me that the stock L-jet fuel pressure regulator regulates fuel pressure in the mid-30s psi range give or take a few psi depending on engine load.

[Tifosi]

Your memory is correct.

32-36 psi with vac and up to 40-43 psi under load/low manifold pressure.

[Tifosi]

To further it along a bit:

Most of the usual suppliers have the stock item, as do many of the local parts counters, so you can shop for brand/price/whatever.

If you've got a stock rail, then no problem, just install it.

If you've got an aftermarket rail, you'll have to come up with a means of screwing onto the threaded input of the regulator (AN fittings 'might' fit, but I've never tried) plus a mounting bracket, a vacuum line that pulls off as many intake runners as you can get (to balance out the pulsations and keep the pressure steady) and a return line.

The other route would be to pick of an aftermarket adjustable performance regulator (pricey, but they are inifintely adjustable and most are rebuildable too so you never need buy another) from someplace like Autometer or Holley, an in-line fuel pressure gauge with a range of 0-60 psi (not cheap either, but well worth the expense regardless of regulator type used) and just mount it all somewhere convenient.