Builds A 1994 80 Series gets an LQ9 GM V8 (3 Viewers)

[35inchoverdrive]

The photos of switching up the fuel lines at the tank are a little confusing, but I'll do my best here.

Here is the stock setup, with the stock return line on the far left and the supply line just to the right with the banjo fitting.

The stock supply line gets cut and replumbed with a barb fitting, since it will now become the return line.

The new supply line is then plumbed into the new banjo fitting with an AN fitting. It's not pictured, but it goes to a short piece of flexible hose to make removing the fuel tank easier(for future maintenance).

 

[Onefastrx7turbo]

I use one of these on my 6.2L RX7 for my oil pressure and temperature sensors. It replaces the factory GM oil block off above the oil filter.

http://www.improvedracing.com/senso...-turbo-feed-adapter-for-ls-engines-p-341.html

 

[35inchoverdrive]

That's a slick looking piece. Thanks for sharing.

 

[Overland Tailor]

Nathan,

Stock pump adequate for the 6.0L? I would assume so as the 6.2L in the JK was fine on the small jeep Fuel pump.. Restriction to making HP on the Dyno was the intake.. We ran out of air before fuel~

Just wondering as I just replaced my in-tank with new OEM...

Thanks,
John

 

[scottryana]

A new stock OEM pump would probably be fine, it supported about 400 crank with no problem in my truck, but I still upgraded for safety, but I would imagine on this build the pump was 20 years old and might not have been operating at 100%. Or might as well change it now instead of waiting for issues in the future.

 

[35inchoverdrive]

Nathan,

Stock pump adequate for the 6.0L? I would assume so as the 6.2L in the JK was fine on the small jeep Fuel pump.. Restriction to making HP on the Dyno was the intake.. We ran out of air before fuel~

Just wondering as I just replaced my in-tank with new OEM...

Thanks,
John

The specs on the factory fuel pump say that it's up to the task. Our plan was to upgrade the fuel lines to the correct size and then monitor the fuel pressure(especially under load) to make sure that everything is working like it should. If the stock pump doesn't do the job, then we will switch out to an upgraded fuel pump.

 

[35inchoverdrive]

The heater hoses will be really close to the exhaust manifold on the passenger side, so a heat shield has to be fabbed up.

After cleaning up the flash rust:

 

[35inchoverdrive]

Here's the heat shield painted and installed. Things will look a little cleaner once the engine is in place and everything is fastened down.

 

[RockJock82]

The twin turbo Supra Denso fuel pump fits well if you need to go that route

 

[Dirty Koala]

The twin turbo Supra Denso fuel pump fits well if you need to go that route

I believe the supra pump is rated at 44 psi and the LQ9 is looking for 50-60 under acceleration. Maybe better off over supplying and then regulating down to 50-60 with a vacuum operated regulator.

A mate of mine recently found a 90 psi pump from summit that fits perfectly.

 

[Onefastrx7turbo]

The most common pump among V8 swappers in the RX7 community is the Bosch 044. I also use it in my RX7 with the 6.2L LS3.

 

[35inchoverdrive]

...and now the drivetrain goes back in.

 

[RockJock82]

I believe the supra pump is rated at 44 psi and the LQ9 is looking for 50-60 under acceleration. Maybe better off over supplying and then regulating down to 50-60 with a vacuum operated regulator.

A mate of mine recently found a 90 psi pump from summit that fits perfectly.

I run the Supra Pump in mine with zero issues... Id stay away from the aftermarket Walbro pumps as some have tried them and they are crap and noisy.

 

[Onefastrx7turbo]

The real Walbro pumps are good. The problem is the cheap Chinese junk flooding the market with "fake" Walbro pumps.

 

[rockrod]

The twin turbo Supra Denso fuel pump fits well if you need to go that route

It's what I am using. I tossed the original 80 series pump, and tried a walbro. never again with walbro pumps. It could manage the pressure but it was ridiculously noisy. I then switched to the denso supra TT pump and it's been going strong for 2+ years now without an issue - and it's quiet.... very quiet. It has no problem at least for me with the L33 - I would think it should be enough for most of the other LSx applications (non forced induction of course).

 

[35inchoverdrive]

The heat shield makes a bit more sense with the engine back in place and the heater hoses hooked up.

 

[35inchoverdrive]

...crimping A/C hoses.

 

[Dirty Koala]

Nice, what crimper is that? And where did you get the uncrowded fittings?

 

[35inchoverdrive]

Nice, what crimper is that? And where did you get the uncrowded fittings?

The crimper is made by Mastercool, and the fittings are from a company called Cold Hose.

 

[35inchoverdrive]

...continuing with buttoning everything up. One of the plug wires was contacting part of the airbox, so the coil mount had to get redrilled and clocked just enough to keep any friction or arcing at bay.