low BLM

[PlayingWithTBI]

I have a similar setup in my '88 C1500 except instead of L31r I went with Summit Racing 162108 TBI aluminum heads 62cc with 2.02 intake and 1.60 exhaust, same TB with 18LB spring, heated O2, headers with JBA Y to 3" high flow cat and 3 chamber muffler. I also have a Harris chip, I think he calls it a level 4 on my 7747 ECU. I'm now working with Dave w on a new tune. I'll let you know how it comes out.

I'm curious, do you know what bin file Harris used on yours? He called mine "...Summit 350 asdu L4".

[dhworkin]

Thanks Fast355, I tried to find your posts about the vortec spark map and the timing maps but not finding. I'll get on a better pc and learn to navigate this site. I started a little over a year ago after a guy on hotrodders sent me here. Dave W started to help me but I had to stop and deal with other things. He got me going with a ostrich 2 and I understand the data log, uploading and emulating process. I'm going to solder new connectors to sensors/switches this weekend and will do the work to regulator. Should I get the bolt/screw and modify the reg? and if so should I use 18lb spring? Pic is 02 after a 30 mile trip.
PlayingWithTBI, he called the chip vortec. It had stage c level 1 on it.IMG_5473.JPG

[dhworkin]

I'm going to install a areomotive 13301 regulator. What I understand is that you block off the reg on the TB, flow is from pump to 13301 and out to fuel inlet on TB, run return line from 13301 to tank. What happens to the return line at TB, does it get plugged?

[Owl]

dhworkin I feel your pain. I too have a Vortec engine with Edelbrock performer intake, tbi and headers. I also purchased a chip from Harris and my engine idles rich with a catalytic converter. I have tried fuel pressure up to 20 psi and down to 15 psi with no difference in behavior, so unfortunately, we both may need to start over with a decent tune before going in circles. Best of luck.
Owl

[myburb]

I have found as long as you are looking for a fuel pressure higher than your tbi spring, just connect return from tbi to inlet of aeromotive and outlet to return line, you are good to go.

[Fast355]

I have found as long as you are looking for a fuel pressure higher than your tbi spring, just connect return from tbi to inlet of aeromotive and outlet to return line, you are good to go.

I remove the regulator completely and fabricate a cover to go into its place. It eliminates a possible future fuel leak from a ruptured diaphram.

[dhworkin]

I got rid of the Harris chip and loaded a stock bin, set up history table and smoothed VE. Got the 13301 installed(on the return side) thanks for the help. Going to make a block off plate and change header gaskets this weekend and would like to install a Wbo2 but I don't know what to get. what do you suggest, thanks

[ph4ze]

I'm going to install a areomotive 13301 regulator. What I understand is that you block off the reg on the TB, flow is from pump to 13301 and out to fuel inlet on TB, run return line from 13301 to tank. What happens to the return line at TB, does it get plugged?

On ebay somebody makes a nice chromed block off plate for the tbi. Comes woth plate, screws and gasket. I think i paid somewhere between 10-20 bucks for it. Works perfect. And i bought a cheap aeromotive knockoff off ebay and put a aeromotive diaphragm in it. With it after the return line. All AN lines. Works flawlessly. Im running about 35 PSI of FP.

[dhworkin]

Thank's ph4ze, I made a plate from 3/16 aluminum and used the factory screws. I have a friend that's a TA2 driver and he let me have the AN fittings and lines at no cost so I splurged on the aeromotive.

[Kitch]

Do you have a photo of your external regulator setup?

[dhworkin]

IMG_5635.jpgIMG_5649.jpgIMG_5651.jpg NXOEE5864.JPG I had to buy two fittings that the shop didn't have, the 991954 for the TBI outlet and the 165056 that is a compression fitting for the hard return line.