VS 5.0L engine mods help

[darky82]

Im in the process of rebuilding my 304 with .040 flat tops, head work with bigger valves and 532 cam, will have 10:1 comp, question is will my stage 4 memcal and AFR take care of exrta fuel needed

[Pub247]

No............

[darky82]

so i will need an injector upgrade i can get 220cc ones

What size are std

[Pub247]

Lol 220cc is about what you got now perhaps smaller

You'll prolly get away 300cc or so injectors and its going to need a re-tune no matter what

[Reaper]

Go visit a reputable tuner with your exact engine/transmission specs + final drive and get it done properly. Your combo doesn't sound like it's suitable for an "off the shelf" special type tune.

Reaper

[darky82]

Ok cool cheers man, guess the std pump needs relacing to, is there a higher psi replacment pump at all

[Pub247]

standard pump should be fine maybe a higher flow pump like an intank 040 bosch or walbro is worth investing in. You dont need more pressure just more flow

[darky82]

Ok, i might see how it goes with a std pump, also why wont the memcal level things out after changing injectors, is this bacause on a rise in manifold VAC to the map sensor throwing thing out

[Pub247]

Theres no such thing as stages anyone who sells that sort of thing its a gimmick to sell things to people who dont know any better and when it comes to tunes off ebay pr the like you'll find most of themare waste of money and petrol and probably wont give you anymore power.

Memcals is what holds the tune for engine. Any mods such as a cam, injectors or raised compression require a retune to maximise the performance from the upgrade. Aproper tune will be done on a dyno using kalmaker or such then a new memcal is burned and installed in ecu when tune is finalised

For example if you put in bigger injectors without a retune, the ECU assume theyre still stock and will treat them as such but in reality your actually putting more fuel in when its not needed so your wasting petrol

[Warranty Void]

Dyno tune is without a doubt the best way to go. If you need a tune to get you running and use as a baseline to tune from you should talk to "nicefrog" on ebay...was known as greenfoam on this forum once upon a time and does the best "Tell me what your mods are and I'll write up something close" eproms for the delco that you are likely to find. Usually under $100 too.
I'm not saying get a chip from him and leave it at that but for 100 bucks one of his tunes is a good place to start.

[E-T-H-A-N]

i would of spoken to someone to get it tuned before i even started the build, your best bet is to talk to someone who does tunes, your gonna be looking at a full custom remap no matter what, there is no off the shelf tune any more because they just dont work as well as a custom map, its probly going to cost about 1k. i would also look into a piggy back system, becuase tunning the delco computers is hard becuase when your turn it bumps the revs up and stuff like that its hard to calibrate the fuel needed so the piggy back is by far the easyest way to go.