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Old 12-05-2019, 10:06 PM   #1
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Fuel Pressure

I keep seeing different answers.
What is the stock fuel pressure for m6?
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Old 12-05-2019, 10:21 PM   #2
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Manual or automatic doesn't matter. I don't know specifically, but I would expect to see around 60psi or so. I'm sure someone can post the actual spec though.
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Old 12-06-2019, 12:18 AM   #3
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Old 12-06-2019, 11:18 AM   #4
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Old 12-06-2019, 12:14 PM   #5
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Quote:
Originally Posted by Vegas Bound View Post
58
58 is what mine runs at also. But I do have the ZL1 fuel pump.

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Old 12-06-2019, 02:22 PM   #6
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factory fuel pressure runs about 58psi, but is commanded to drop to 50-51psi in the upper RPM. most people believe that this is caused by the pump getting weak but in most cases that is not true. it is in the GM programming of the fuel pump control module.

give us a shout at Support@Gwatneyperformance.com if you ever need any more answeres. we would be glad to help.

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Old 12-06-2019, 02:50 PM   #7
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4 bar - 58psi
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Old 12-06-2019, 09:18 PM   #8
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Stupid question but this seems a somewhat relevant place to ask it. If stock as is ~58, what is the pressure on the ZL1 pump? Or is it the same pressure and is just capable of moving a lot more fuel at that same pressure?

And does this mean that when injector shopping, I should be looking at the rating of the injectors at 4 bar? Seems like most list them based off the 3 bar flow
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Old 12-10-2019, 07:58 PM   #9
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Quote:
Originally Posted by go_go_gadget88 View Post
Stupid question but this seems a somewhat relevant place to ask it. If stock as is ~58, what is the pressure on the ZL1 pump? Or is it the same pressure and is just capable of moving a lot more fuel at that same pressure?

And does this mean that when injector shopping, I should be looking at the rating of the injectors at 4 bar? Seems like most list them based off the 3 bar flow
ZL1 pump = more flow @ 58psi than SS pump.

Injectors that are rated 50lb/hr @ 43psi will flow more fuel at 58psi than injectors that are rated 50lb/hr @ 58psi.

So, keep looking at the 3 bar flow ratings
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Old 12-11-2019, 06:52 AM   #10
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Quote:
Originally Posted by ss_redrum View Post
I keep seeing different answers.
What is the stock fuel pressure for m6?
SS fuel pressure is 58psi tapering down to 48psi as rpms go up.
ZL1 fuel pressure is 58psi at all times.

If you drop a ZL1 pump into a stock SS, you will get 58psi tapering down to 48psi by redline (but slightly more flow from the bigger pump).

If you add a ZL1 FPCM, you will get 58psi at all times.

If you use HPTuners to edit your stock ss FPCM, you can set it to whatever you want.

That's why you see so many different answers on this topic. The FPCM (fuel pump control module) controls the fuel pressure.
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Old 12-11-2019, 09:50 AM   #11
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Quote:
Originally Posted by Batmanntexas View Post
ZL1 pump = more flow @ 58psi than SS pump.

Injectors that are rated 50lb/hr @ 43psi will flow more fuel at 58psi than injectors that are rated 50lb/hr @ 58psi.

So, keep looking at the 3 bar flow ratings
10-4 on the pump. As for injectors, I guess I knew that much...maybe the better question is: "If someone is telling me to get 850cc or 1000cc or whatever injectors...are they probably meaning based off 3 bar like ratings show or 4 bar like our system will be running?"



Quote:
Originally Posted by eLeSthree View Post
SS fuel pressure is 58psi tapering down to 48psi as rpms go up.
ZL1 fuel pressure is 58psi at all times.

If you drop a ZL1 pump into a stock SS, you will get 58psi tapering down to 48psi by redline (but slightly more flow from the bigger pump).

If you add a ZL1 FPCM, you will get 58psi at all times.

If you use HPTuners to edit your stock ss FPCM, you can set it to whatever you want.

That's why you see so many different answers on this topic. The FPCM (fuel pump control module) controls the fuel pressure.

Makes sense. If I am reading right, the ZL1 FPCM isn't really needed, now that you can use HPT to make these changes to the SS one?

Related question: could one get slightly more flow out of an SS pump by just commanding it to 58 at all times instead of dropping off? Not that I plan to do so, just curious while we are near the subject



Thank you guys for the answers though!
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Old 12-11-2019, 04:37 PM   #12
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Quote:
Originally Posted by go_go_gadget88 View Post
10-4 on the pump. As for injectors, I guess I knew that much...maybe the better question is: "If someone is telling me to get 850cc or 1000cc or whatever injectors...are they probably meaning based off 3 bar like ratings show or 4 bar like our system will be running?"

Could be either way, just need to verify with seller.



Quote:
Originally Posted by go_go_gadget88 View Post
Makes sense. If I am reading right, the ZL1 FPCM isn't really needed, now that you can use HPT to make these changes to the SS one?
Yes, you could just use the stock SS FPCM.

Quote:
Originally Posted by go_go_gadget88 View Post
Related question: could one get slightly more flow out of an SS pump by just commanding it to 58 at all times instead of dropping off? Not that I plan to do so, just curious while we are near the subject
No, the SS pump is physically smaller, so it will never move the same volume of fuel as the ZL1 pump.


Quote:
Originally Posted by go_go_gadget88 View Post
Thank you guys for the answers though!
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