10 psi question

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10-01-2007, 08:42 AM
farmtruc

If you buy the 60lb'ers that means you can 15psi, heheheh
10-01-2007, 06:58 PM
the_jester

but can my stock internals hold 15psi, hehe thats the real question, injectors are cheap, blocks not so cheap.
10-02-2007, 08:14 AM
SCIV

Quote:

Originally Posted by the_jester

but can my stock internals hold 15psi, hehe thats the real question, injectors are cheap, blocks not so cheap.

It is a calculated risk. You are already pushing past what it was designed for.
10-02-2007, 10:04 AM
txarkitekt

Hell no! A stock bottom end can't handle 15 psi. Ok, yes it would--for like 2 WOT runs--then BOOM! You'd throw a rod through the hood! You can run 10 psi reliably... Anything past that, and you are rolling the dice...
10-02-2007, 11:23 AM
farmtruc

I think JJ will chime in and disagree, lol.
His truck has seen 20psi a few times, and has been running on the same engine with 15psi for about 2-3years, many, many passes at the track and lots of street driving.
I hope I just didn't jinx his truck, hahah

you're right though, 10psi is fine, but 15psi is pushing it, you constantly have to monitor when running that much boost.
10-02-2007, 11:45 AM
KY_BOB

Quote:

Originally Posted by the_jester

well, I'm running 9 psi on the stock 21 lb in the silvy, but i know what you mean. damn it. that pulley is calling my name. well, if i get some 42's will the stock pump put out enough to run them? because i am getting LT's and ORY, and i know from the silvy that you have to richen it up after adding headers. so with 42's and headers will the stock pump still be up to it?

I was seeing 110-115% duty cycles on my stock 28# injectors at 10psi even with a 10:1 FMU. (With the 10:1 disk in it I've seen it peg my 100 psi fuel pressure gauge.) Probably the only thing that saved me from damaging something was the fact that I was spraying meth.

I now have 42# and they run about 80% duty cycle. I still have the FMU but dropped back to a 6:1 disk in it. It barely moves my fuel pressure now. I may see 65psi at full boost.

IMO you need at least 42# injectors.
10-02-2007, 02:18 PM
txarkitekt

Quote:

Originally Posted by farmtruc

...JJ...has been running on the same engine with 15psi for about 2-3years, many, many passes at the track and lots of street driving...

you're right though, 10psi is fine, but 15psi is pushing it, you constantly have to monitor when running that much boost.

Damn, JJ has a stock bottom end?
10-02-2007, 03:06 PM
farmtruc

Quote:

Originally Posted by txarkitekt

Damn, JJ has a stock bottom end?

Ya, stock block and internals, well an LS6 cam only.

Heads have never been off, no gaskets leaking, doing pretty good so far.
10-02-2007, 04:22 PM
txarkitekt

Wow, good work Allen! That is amazing that thing is still tight. That brings up my confidence on the stability of the LS block for FI...

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