Vortec Head swap on my '92 TBI 350. Tuning questions.

**woody80z28** · 07-04-2013

Originally Posted by jdyates

Mine is essentially adjustable as well, but the spring that came with the kit when i rebuilt my TB last year seemed shorter but stiffer. I have absolutely no clue what PSI the injectors are running at. I've had it hooked to a scanner and it kinda bounces between lean and rich at idle, so at least it's not only running lean.

Does it matter what fuel pump I drop in it, as long as I have the stock FPR (with pressure raised up a bit)? What should I be looking to run as far as fuel pressure into the injectors, and how would I go about measuring it?

It doesn't matter as long as there is enough flow at the higher pressure and it's not so crazy that it overflows the stock return. I just know that the TPI pump works well and it's cheap. I plugged some specs in to a calculator online and came up with 20psi to support 300hp at 80%DC. I would think 18-20 would be the range you're looking for. I got an adapter from cfmtech for the fuel inlet fitting for a cheap gauge from Summit as you can see in the pic.

**jdyates** · 07-04-2013

Originally Posted by woody80z28

It doesn't matter as long as there is enough flow at the higher pressure and it's not so crazy that it overflows the stock return. I just know that the TPI pump works well and it's cheap. I plugged some specs in to a calculator online and came up with 20psi to support 300hp at 80%DC. I would think 18-20 would be the range you're looking for. I got an adapter from cfmtech for the fuel inlet fitting for a cheap gauge from Summit as you can see in the pic.

Does that adapter measure what is going to the injectors, or just what the fuel pump is putting out? And which TPI pump should I use? I was looking on Summit and there was one for about $50 stock replacement for a IROC.

**jdyates** · 07-06-2013

Got some assembly done today. Got some brass barb fittings for the heater core hose and brake booster line, sealed everything up, and took the TBI and CTS off the old intake to put on the new one. The 1-1/2" carburetor studs I got to mount the TBI were too short, so I'm gonna pick up some 2" studs tomorrow, as well as a new thermostat and housing, and another set of head bolts. Next week on payday I'm gonna order the TPI pump like you guys are recommending, then hopefully she'll be on the road and kickin' hard! Assembly pics below.

Old and new, WOW!

New intake assembled:

Comparing clearances, shouldn't have a problem with the stock hood :D

All done, save for the new thermostat and housing:

And pics of the old stuff, nasty! And no wonder why I was having EGR problems!

**dave w** · 07-06-2013

I'm wondering if there are any clearance problems with the 350 TBI throttle blades being able to open all with way with the adapter plate you are using?

dave w

**jdyates** · 07-06-2013

Originally Posted by dave w

I'm wondering if there are any clearance problems with the 350 TBI throttle blades being able to open all with way with the adapter plate you are using?

dave w

Not at all. I imagine I would if it were a 454 TB with bigger bores, but so far they work great.

EDIT: Without the adapter plate they would not clear, but it spaces the TB perfectly that they have just enough clearance to open fully.

**jdyates** · 07-10-2013

Alrighty guys, the 062 heads are on, and intake assembled and ready to be bolted on. Just need a new thermostat and housing, and a few hoses and clamps and i should be good to drive, while i get the Camaro fuel pump shipped to me.

Two questions,
1. Will the Camaro pump bolt right in in the stock one's place? No modifications?
2. When buying it, which pump should I use? Off a '90 IROC 5.7?

Also, who thinks they can whip me up a tune? Need EGR deleted and whatever else done to get her running tip top :)

**woody80z28** · 07-11-2013

Yes it will bolt right in and I think the 305/350 pump is the same but I ordered for a 350. And the PSI gauge shows what the injectors are seeing, and therefore their new lb/hr so you can set the spec in the tune.

**EagleMark** · 07-11-2013

Originally Posted by jdyates

Also, who thinks they can whip me up a tune? Need EGR deleted and whatever else done to get her running tip top :)

This guy may be able to help...

http://www.gearhead-efi.com/Fuel-Inj...1776-TBI-Chips

**dave w** · 07-11-2013

Originally Posted by jdyates

Also, who thinks they can whip me up a tune? Need EGR deleted and whatever else done to get her running tip top :)

Remote tuning usually requires the vehicle owner to do data logging. How are you setup to do data logging? There are some AWESOME .adx files available here: http://www.gearhead-efi.com/Fuel-Inj...Information-42 (that are free)

Remote tuning can be done in real time with "net meeting" software that will allow the remote tuner to have control of the vehicle owner's laptop using WiFi connection to the internet and an emulator.

dave w