383 startup with Inovate Wideband O2 installed

[GNERGY]

I swapped a 383 stroker from my 81 Burb in to a 91 Burb that has a TBI on it. Wanting to get better fuel mileage I decided to put the TBI on the 383, thats how I found this site to begin with. I swapped the cam and intake with the Edelbrock TBI performer manifold and cam. I bored out the intake to 2 inches because I planned on using a 454 throttlebody ( from junkyard ) instead of paying $$$ to have a 350 one bored out. I changed the arm so it will work with my 700 tranny. I installed an adjustable fuel pressure regulator and installed a gage. So for my initial startup i installed the 350 injectors in the 454 throttlebody I have a better fuel pump but can't install it till I get the truck running so I can back it in the driveway and drop the tank. I live where I have an HOA and they complain about everything. I installed a heated O2 sensor besides the wideband down in the collector after the headers.

Now you are up to speed with what is going on. The wide band I bought to put on my GN but haven't installed it yet, so I will use it here for tuning purposes.

So today I went to start it and it backfired thru the throttlebody so I had to pull the distributor and rotate it 180*. I unpluged the tan wire with blk. stripe so I can set the timing. It started up and I ran it for about a minute while I set the timing to 0* Wide band reading was 14.7 to 15.2 fuel pressure was 11 psi. and idle was at 1200 to 1250 rpm. I shut it off to check for leaks. Then I let it run for about a half an hour or so and let it heat up, made sure the windstar fans came on. I think the 205* temp switch is a little high if you ask me. When it warmed up wide band read 14.5 the fuel pressure was at 11 psi and the idle was at around 1100 rpm.
Fingers are tired, will post more later.
Tarey

 

[Thunder]

14.5 is pretty good. Your idle is high but that may be because it is a 454 TB and base idle is set for a BBC. Did you reset the base idle yet?
You most likely will need a little higher fuel pressure to feed that 383 at higher RPMs.

You said you installed a new cam Did you follow the run in procedure to break in the new cam? If not dont drive the truck untill you properly break in the cam. You did use new lifters I hope?

 

[BGKYK5]

Subscribed!

 

[rcamacho]

Glad to see one of the forum members tuning A/F ratios.

 

[dyeager535]

Waiting to see what AFR looks like under high load...

Don't worry about the 205* switch, GM set the later EFI car 350's for 220* for fan on FYI. Just cycles them (and the thermostat) less and the engines are more efficient at higher temp. Only real potential problem IMO is that if something goes wrong and the engine starts to overheat, you don't have as much time to notice, but I think that's a very small detail.

 

[4X4HIGH]

Subscribed.

I'm interested to see if YOU can make this work. I've already tried using the 454 TBI with 350 injectors and it did not work for me (the chip is burned differently for injector dwell time based on injector size and air flow). Currently i'm running the 454 TBI with it's injectors and 18 PSI of fuel pressure (i do have a custom chip from Brian at TBIchips). I have data logged and sent the file to Brian at www.TBIchips.com and he says everything looks good (third chip he burned for me). Soon i will be heading to the dyno shop to have them "fine tune" the chip and get my HP and TQ numbers.

 

[GNERGY]

I broke the cam and new lifters in while the motor was still in the 81 Burb and was carbarated. I found out today while talking with Scott Bartling, who owns an 11 second 2006 silverado that runs on E85 and puts out 449 RWHP. He was telling me that the ECM can compensate fuel delivery up to 25% so that is why the wide band read 14.7 ( where it is supposed to be ). He also said that if the service engine light stays the fuel delivery is out of what the ECM can compensate. I don't want to keep the 350 injectors in there just wanted to get it to run. I still have a better fuel pump to put in tomorrow. I don't have a data logger to send to any info TBI chips. I have read he is real good. How many of you have got the right chip the first time.
And how in the HECK do you guys get your fingers in there to turn that little knob for the adjustable fuel pressure regulator.
Tarey

 

[4X4HIGH]

I made the stock regulator adjustable again (they are adjustable from the factory but GM drops a blob of weld to keep people from messing with it). I just remove the injector cover and flip it over and make my adjustment with a small screw driver then bolt it back together.

 

[Thunder]

And how in the HECK do you guys get your fingers in there to turn that little knob for the adjustable fuel pressure regulator.

Its kinda a PIA. I reach in from the passenger side and use the middle finger on both hands to turn the screw. Once I figgured out how to properly flip off my TB it wasn.t so bad.
It is easier to trun the screw if the engine is off and no pressure is on the regulator.
Turn screw in to raise pressure.

 

[GNERGY]

I have been trying to adjust it with motor off and fuel pressure bled off. It is just a pain in the a$$. I got it to turn a little using a small needle nose pliars with some electrical tape on the jaws for gripping that little red knob.
Tarey

 

[dyeager535]

He also said that if the service engine light stays the fuel delivery is out of what the ECM can compensate. I don't want to keep the 350 injectors in there just wanted to get it to run. I still have a better fuel pump to put in tomorrow.

If you can keep it right around 14.7:1 under idle/low load conditions, you are doing good. Heavy load is where undersized injectors/poor tune would show it not running in the 12.5-13 range, where it should be.