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Discussion Starter · #1 ·
:headscratch:I have a big issue here, i have 347 supercharge motor. i have change almost every part in the car tps,computer,sensor,etc...
and still can not run no more 5,000 rpm before car stalls. Car will act funny once is warm.Please any help advice will greatly be appreciated before 347 motor be up for smoke.....HELP!!!!:headscratch::headscratch::happyhapp
 

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What injectors and fuel pump are you using?
 

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It's hard to give advice, without actually hearing it run. Also was this 347 a stroker kit, that you built or was it a crate motor? Where the motor came from would also help, and what type of supercharger and who put it in? If you can take a video of the entire assembly while running, need to know you fuel management system. Do you see where I'm going with this, it's very hard to troubleshoot a problem on what someone is telling you without listening to the engine running. Or even see how it runs, under load take a video and post it, Mike. SCT Tuner.:bigthumbsup
 

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Discussion Starter · #7 ·
89coupe which one you think injectors? inline fuel pump is not connected,and 255 holley is only pump connected
 

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You have plenty of pump. My opinion is you are shy on the injectors for a boosted 347. Heck if it was me, Id run 30-36 injectors on a N/A 347. You may need 42's. But your boost is relatively low.

Does it buck any before it stalls? Fuel Pressure Ok?
 

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Discussion Starter · #9 ·
buck and let go of gas for rpm to drop and get on it again untill it will reach that rpm in this case is 5,000rpm....
 

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The engine stalls if it reaches 5000? You could be running lean at high rpm but what ignition system do you have? The stock system is decent but it starts dropping power around 5000.
 

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The engine stalls if it reaches 5000? You could be running lean at high rpm but what ignition system do you have? The stock system is decent but it starts dropping power around 5000.

This is what I was getting at Eagle. And I think the injectors are playing a big part in this. Blown and N/A combos are totally different in the Fuel delivery part. The reason I asked if it was bucking..... And my injector theory. I believe they go hand n hand in your situation. Meaning the bucking is related to the small injectors. Raising fuel pressure is only gonna do a very little when the injectors are too small. I suggest you look at your plugs. And I also suggest not taking it to 5000 if its leaning out. Or your motor will be trashed.
 
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