I've had a devil of a time with my low impedance setup so I'm going to punt and get the high impedance injectors. According to their site, they've got a new design on the high volume hi-impedance injectors that eliminates the need for the low impedance boxes/injectors. Just want to see if you guys are hearing anything good/bad/ugly before I pull the trigger since they're not cheap ($1,000 ish...)

Yesterday, on my weekly drive to/from Rochester(249 miles each way), the car was running so sweet. I got into boost a couple of times but just getting on the freeway and when leaving the service centers on the tollway. I have the Tru-boost controller and it has a history function so I press that occasionally to see what boost I attained and try to take mental note of how aggressively she accelerated in relation to the posted boost number. I was mildly distracted on one occasion and, instead of pushing the 'boost history' button, I pressed the other one which toggles the 3 boost generalities of "Boost default A", "Boost default B" and "run on spring only". I had been running it on "Spring Only" since that gets me 15psi, but when I hit the toggle, it accidentally set it to "A". I glanced at it for a second and realized what I'd done but since I was already on the tollway, thought, "Ah... I'll change it later". So, an hour later, I pulled off at my exit, stopped at the stop sign and turned left to get on her with a 15psi (I thought) couple of gears. Good lord, I flew thru those two gears and I was grinning, having not remembered it was on the "A" setting. I pressed the history button. "Oh.. that's why" as the history was showing 21.5psi. Lol.. God I love this car....

 

I'm running high impedance 83's on my 408 LS car. At 58 PSI they're basically 96# injectors. They idle fine and the highest DC I've seen has been about 40% at 7000 rpm. lol

They were $400 from FIC.

 

After much polling and reading, I ordered a set of these...
https://www.texas-speed.com/p-3976-b...injectors.aspx

 

Those should be enough to feed a little old LT1.

 

Yes sir Chris
They say they have a data sheet for them but given the limited parameters the LT1 PCM has, I don't know that they'll do much good for me. I'll probably set the injector constant then start test driving again.

 

Might be a good time to swap to the 24x setup with a 2 or 3 bar OS.

 

I'm such a hammerhead on that. I'm just reluctant to spend the money for that but I know I need to.

 

Got the 127# Bosch fuel injector data sheets if anybody wants to see them.

 

It's not that bad if you repin the harness youself. I spent a little over $1100 on mine and that included a freaking $350 billet aluminum timing cover to clear my double roller.

 

Hmmm... do you have a specific part number or part numbers/kit number?
I don't want to end up like some guys stories I've googled where the install the entire thing, then the car won't run because their reluctor was out of spec/tolerance because they had xyz timing set instead of the required zyx set.


Thanks!
Dave

 

Give them a call and talk to Mike. He'll answer all your questions and get you hooked up. When I ordered mine we walked through every part that was needed and he sent me an invoice that I just paid instead of trying to write down a list of parts to order.

 

Okay. Next paycheck, I'll do it.
Thanks,
BTW... who is "Mike"?
Got a link handy?

 

The injectors came in today Along with the T3 flanges for the twins.

 

Got the injectors...


Currently, I'm running the stock Fuel Pressure Regulator but I'm ordering the Aeromotive AFPR #13107 today so I can run the injectors at 4bar (58psi) instead of the stock 3 bar (43.5psi)

 

I wouldn't use the LT1 specific regulator, I've seen them fail too often. Mine did and cost me a head gasket years ago. Just get an A1000 or leave the stock one in place, it's 1:1 anyway.

Interesting that you're using a T3 flange vs T4 or V band. I was considering a pair of Turbonetics "Ashley" 6665 turbos for my 408 but I was having concerns about the T3 size for the large CID and the ability to hit ludicrous speed.

EFI Connection, LLC - EFI Connection Information

Mike is the main harness guy at EFI Connection and the owner. Cool guy.