IHADAV8.com - Turbo Buick Tech, and Nonsense

Tech Area => General Buick Tech => Topic started by: Steve Wood on June 08 2018, 06:58:35 PM

Title: Test time! Cam Sensor unplugged
Post by: Steve Wood on June 08 2018, 06:58:35 PM: Will some of you guys that have large injectors do me a favor? Crank your car up and unplug the cam sensor connector plug.

I have always thought that the car should flip into batch mode and keep right on running as if nothing had really happened. Not every ones' car does so, however. Now, John Spina just told me that the car assumes it has stock injectors when it flips over so cars with big injectors may run badly because they are running very rich.

My cars have SD chips and that may be a difference maker.

So go pop the connector and see if you will-if you have larger injectors.
Title: Re: Test time! Cam Sensor unplugged
Post by: Scoobum on June 08 2018, 08:38:47 PM: How big of an injector are we talking?
Title: Re: Test time! Cam Sensor unplugged
Post by: Steve Wood on June 08 2018, 08:39:42 PM: say 50 psi or bigger...
Title: Re: Test time! Cam Sensor unplugged
Post by: Scoobum on June 08 2018, 08:54:40 PM: 80's here...but you'll have to wait a couple weeks...
Title: Re: Test time! Cam Sensor unplugged
Post by: daveismissing on June 08 2018, 10:18:16 PM: Does it use the analog "programming" of the CALPACK? then it would assume stock.
Title: Re: Test time! Cam Sensor unplugged
Post by: daveismissing on June 08 2018, 10:19:21 PM: Crank the fuel pressure way down?
Title: Re: Test time! Cam Sensor unplugged
Post by: Grumpy on June 08 2018, 11:37:53 PM: Did that for years with blue tops (36#s). Best was an 11.28 @ 122 in a TTA. Melissa ran 11.4s in a Buick.
Title: Re: Test time! Cam Sensor unplugged
Post by: Steve Wood on June 08 2018, 11:41:20 PM: Yep, it was common
Title: Re: Test time! Cam Sensor unplugged
Post by: Steve Wood on June 09 2018, 04:18:08 PM: Guess no one owns a modified version buick in here
Title: Re: Test time! Cam Sensor unplugged
Post by: Forzfed on June 09 2018, 06:49:03 PM: Modified, yes! Running, no. But very soon.
Title: Re: Test time! Cam Sensor unplugged
Post by: good2win22 on June 09 2018, 11:29:54 PM: I'll give it a try when I get back home on wednesday. SD2 on the car
Title: Re: Test time! Cam Sensor unplugged
Post by: Steve Wood on June 10 2018, 12:03:41 AM: that would be interesting. Mine runs okay on SD1
Title: Re: Test time! Cam Sensor unplugged
Post by: TWild on June 10 2018, 10:33:41 AM: Hey Steve,

Just for the record...60 lb injectors, 38 psi on the FPR. Runs worse with the cam sensor unplugged. Not running SD.

TW
Title: Re: Test time! Cam Sensor unplugged
Post by: 278CIKILLER on June 10 2018, 11:51:09 AM: Sorry i couldn't help you Steve, But i sold the car.
Title: Re: Test time! Cam Sensor unplugged
Post by: Steve Wood on June 10 2018, 01:13:51 PM: Quote from: 278CIKILLER on June 10 2018, 11:51:09 AM
Sorry i couldn't help you Steve, But i sold the car.

Well, hell, Dan! lol
Title: Re: Test time! Cam Sensor unplugged
Post by: 278CIKILLER on June 10 2018, 01:36:15 PM: Steve would it have made any difference if it was a MSD roller bearing cam sensor? The car did have 83 pound injectors.
Title: Re: Test time! Cam Sensor unplugged
Post by: Steve Wood on June 10 2018, 02:54:02 PM: Honestly, I have no clue...I would not think so but I am guessing
Title: Re: Test time! Cam Sensor unplugged
Post by: Grumpy on June 10 2018, 08:22:05 PM: Quote from: TWild on June 10 2018, 10:33:41 AM
Hey Steve,

Just for the record...60 lb injectors, 38 psi on the FPR. Runs worse with the cam sensor unplugged. Not running SD.

TW
We only used it racing. Would use it high in 2nd gear or when it shifted to 3rd.
Title: Re: Test time! Cam Sensor unplugged
Post by: Steve Wood on June 12 2018, 06:06:08 PM: Got one with an Extender chip and 60# injectors that does not idle well and the injectors make a lot of noise..which they do go off and on twice as fst in Batch mode so that makes sense.

TT 5.6 with 60# injectors runs badly

SD2 with 80's minimal change in AF's-idled ok
Title: Re: Test time! Cam Sensor unplugged
Post by: TexasT on June 12 2018, 11:43:08 PM: Can I get a link to this msd roller bearing cam sensor. I've never ever heard of that. I guess I better ask brad as that sounds like a cool guy part.
Title: Re: Test time! Cam Sensor unplugged
Post by: Steve Wood on June 13 2018, 09:15:58 AM: Quote from: TexasT on June 12 2018, 11:43:08 PM
Can I get a link to this msd roller bearing cam sensor. I've never ever heard of that. I guess I better ask brad as that sounds like a cool guy part.

I'm guessing Dan was referring to his Stage engine with a distributor that included an efi cam sync but I might be wrong. MSD does make such an animal
Title: Re: Test time! Cam Sensor unplugged
Post by: Scoobum on June 13 2018, 02:18:30 PM: Quote from: TexasT on June 12 2018, 11:43:08 PM
Can I get a link to this msd roller bearing cam sensor. I've never ever heard of that. I guess I better ask brad as that sounds like a cool guy part.

Cool...what's that? I got 3 or 4 spare cam sensors...all stock.
Title: Re: Test time! Cam Sensor unplugged
Post by: good2win22 on June 13 2018, 11:05:52 PM: Car was warmed up. Coolant temp going from 172-165 with the fan cycling. IAT 118-122. Idle AFR was 13.0 with -2 correction.

Unplugged the cam sensor and immediately got code 16 on the TR6 thru the tach. Idle seemed unchanged then I looked at the data. AFR went to 12.7-12.8 with 0 correction target is 13.0. It was like it went to open loop. No other changes that I noted. I didn't drive the car.

SD2 with 80's on the rail
Title: Re: Test time! Cam Sensor unplugged
Post by: Steve Wood on June 13 2018, 11:12:23 PM: I'm guessing that the batch fire mode which fires the injectors twice as often is responsible for the AF change
Title: Re: Test time! Cam Sensor unplugged
Post by: TexasT on June 13 2018, 11:15:52 PM: You must be running a dual fan and at night. That is a cool car. I guess my rad needs some work as I'm lucky if the temp is 180* unless it is moving.