curiosity getting the best of me

dirtyd_nd · 07-03-2008, 02:37 PM

I've got a few questions. First off I have an '89 1500 that had 305 in it. I swapped the 305 out for a 350 30 over with a cam. Now I know I need different injectors and a tune. My questions are: Why does it start fine? Why does it seem to be running great but when it gets up to temp it stalls out? It will start fine after it stalls but then stalls again. Once again I know it needs to be tuned, I'm just curious. Thanks for the info guys.
Dale

FastChev · 07-03-2008, 03:47 PM

you know how big the cam is? any other mods to the engine?

GreaseDog · 07-03-2008, 03:58 PM

correct me if i'm wrong here guys, but wouldnt a higher pressure fuel pump and an AFPR be a better solution than larger injectors?

cancritter · 07-03-2008, 04:30 PM

Quote:

Originally Posted by GreaseDog

correct me if i'm wrong here guys, but wouldnt a higher pressure fuel pump and an AFPR be a better solution than larger injectors?

that would be my guess...lot depends on the cam specs and tune...cam being reasonable would head for the wrecker and look for a similar truck with v8 cpu and try it but with added cam may not work due to paramiter diffrences...with changes to cam ect anything other than a custom tune is kinda mickey mouse

GreaseDog · 07-03-2008, 04:51 PM

oh, no. tune for sure, just to make up for the lack of fuel, upgrade the pump and regulator before upping the injector size. i seem to recall that creating a finer mist, which is more efficient.

Blue71 · 07-03-2008, 05:12 PM

Quote:

Originally Posted by dirtyd_nd

Why does it start fine? Why does it seem to be running great but when it gets up to temp it stalls out? It will start fine after it stalls but then stalls again.

On start up its in open loop, it warms up then goes into closed loop. SOooo, every time you start it will be in open loop.

FastChev · 07-03-2008, 07:50 PM

sounds like the cam is too agressive for the tune its got.

dirtyd_nd · 07-03-2008, 08:18 PM

I don't remember then specs on the cam, but it is pretty aggressive. I have the spec card at home and will post it up when I get back home. I appreciate all the replies. It just wasn't making any sense to me. I do plan on getting the comp tuned. How much does it usually cost?

Tbi-MAX · 07-04-2008, 05:38 AM

Quote:

Originally Posted by Blue71

On start up its in open loop, it warms up then goes into closed loop. SOooo, every time you start it will be in open loop.

bingo... as it enters CL a slew of problems begin.. he needs a custom tune to get working in CL properly.

07-03-2008, 02:37 PM	#1
dirtyd_nd Registered User Status: Offline Join Date: Sep 2005 Member ID: 33689 Pics: My Gallery Location: jax, fl Age: 31 Posts: 54	curiosity getting the best of me I've got a few questions. First off I have an '89 1500 that had 305 in it. I swapped the 305 out for a 350 30 over with a cam. Now I know I need different injectors and a tune. My questions are: Why does it start fine? Why does it seem to be running great but when it gets up to temp it stalls out? It will start fine after it stalls but then stalls again. Once again I know it needs to be tuned, I'm just curious. Thanks for the info guys. Dale

07-03-2008, 03:47 PM	#2
FastChev Registered User Status: Offline Join Date: Nov 2006 Member ID: 57737 Pics: My Gallery Location: Sammamish, WA Posts: 142	Re: curiosity getting the best of me you know how big the cam is? any other mods to the engine? 1992 Chev K1500 ECSB L05 700R-4 3.73 gears -Fully Built Bottom End/ Comp Cams 12-402-4/ Dart Iron Eagle 165 Heads/ Edelbrock 3704Intake Manifold/ Walboro 155/ K&N FIPK / Edelbrock TES Ti-Tech Hdrs into High Flow Cat into Dynomax Bullet/ 2000rpm Stall

07-03-2008, 03:58 PM	#3
GreaseDog King Of The Hill Status: Offline Join Date: Dec 2004 Member ID: 21917 Pics: My Gallery Location: IN Age: 27 Posts: 6,730	Re: curiosity getting the best of me correct me if i'm wrong here guys, but wouldnt a higher pressure fuel pump and an AFPR be a better solution than larger injectors? 1977 Chevy K20 - 1980 GMC K2500 - 1992 Chevy C1500 SWB - 1993 Chevy C2500 SAS - 1994 Chevy K1500 READ HERE BEFORE ASSUMING YOU NEED A NEW ENGINE!

07-03-2008, 04:51 PM	#5
GreaseDog King Of The Hill Status: Offline Join Date: Dec 2004 Member ID: 21917 Pics: My Gallery Location: IN Age: 27 Posts: 6,730	Re: curiosity getting the best of me oh, no. tune for sure, just to make up for the lack of fuel, upgrade the pump and regulator before upping the injector size. i seem to recall that creating a finer mist, which is more efficient. 1977 Chevy K20 - 1980 GMC K2500 - 1992 Chevy C1500 SWB - 1993 Chevy C2500 SAS - 1994 Chevy K1500 READ HERE BEFORE ASSUMING YOU NEED A NEW ENGINE!

07-03-2008, 07:50 PM	#7
FastChev Registered User Status: Offline Join Date: Nov 2006 Member ID: 57737 Pics: My Gallery Location: Sammamish, WA Posts: 142	Re: curiosity getting the best of me sounds like the cam is too agressive for the tune its got. 1992 Chev K1500 ECSB L05 700R-4 3.73 gears -Fully Built Bottom End/ Comp Cams 12-402-4/ Dart Iron Eagle 165 Heads/ Edelbrock 3704Intake Manifold/ Walboro 155/ K&N FIPK / Edelbrock TES Ti-Tech Hdrs into High Flow Cat into Dynomax Bullet/ 2000rpm Stall


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07-03-2008, 08:18 PM	#8
dirtyd_nd Registered User Status: Offline Join Date: Sep 2005 Member ID: 33689 Pics: My Gallery Location: jax, fl Age: 31 Posts: 54	Re: curiosity getting the best of me I don't remember then specs on the cam, but it is pretty aggressive. I have the spec card at home and will post it up when I get back home. I appreciate all the replies. It just wasn't making any sense to me. I do plan on getting the comp tuned. How much does it usually cost?

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