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Old 08-15-2012, 10:32 PM   #1
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Default 255 in fuel table

I have 2 spots in boost (140-150kPa @5500-6000RPM) where the values are at 255 and AFR at 13.2 while target is 11.7 for these cells.

What's the best way to solve this situation ? Everything else is on par with AFR target, only those 2 cells.

2000 LS, turbo Begi gt2560, stock injectors, stock fuel pump and fuel pressure, 13.2 req fuel in tunerstudio.
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Old 08-15-2012, 10:51 PM   #2
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2 words: req fuel
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Old 08-16-2012, 12:03 AM   #3
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And you're right. Will try 15.2 and multiply fuel table by 0.87
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Old 08-16-2012, 09:00 AM   #4
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also a reminder to make sure "multiply MAP" is selected in "General Settings"
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Old 08-16-2012, 10:07 AM   #5
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What is your injector dead times at?
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Old 08-16-2012, 10:10 AM   #6
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Um is the issue not stock injectors at 7psi?

Are you sure it's not just you're at 100% Injector DC and Autotune, or whatever is desperately trying to add more fuel to hit your target, but nothing's changing as you're already at max?

Req_fuel is correct for stock injectors...
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Old 08-16-2012, 10:13 AM   #7
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oh crap just saw that he said stock injectors

Yeah, you're done son. Get a pump and injectors stat
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Old 08-16-2012, 11:42 AM   #8
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I'm sure it won't be popular around here, but if you want to cheap out for the time being a $70 walbro 255 will supply more fuel than the stock pump. Should be enough to get you by for the time being I would think. Then again, some $100 RX8 injectors would give you a good bit more headroom.
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Old 08-16-2012, 11:53 AM   #9
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pump is irrelevant if the injectors can't deliver the fuel you need.

What the OP needs is bigger injectors, or if he/she wants to bodge it a RRFPR.
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Old 08-16-2012, 05:11 PM   #10
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Quote:
Originally Posted by y8s View Post
also a reminder to make sure "multiply MAP" is selected in "General Settings"
Yes it is selected

Quote:
Originally Posted by Techsalvager View Post
What is your injector dead times at?
1.0 ms for the stock injectors

Had some RX7 460cc but they never worked in my car and a friend needed some quickly so they're gone.

Will check for RX8 one's and new fuel pump.
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Old 08-16-2012, 06:02 PM   #11
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You shouldn't need a new FP. My '99 stock pump is OK up to 15psi boost with an FM setup.
Sadly my stock rods weren't OK up to 15psi.
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Old 08-16-2012, 08:09 PM   #12
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Well there s not enough fuel maybe a cause to the Vishnu fuel rail. I ll pick up a Walbro tomorrow. Any advice on wich one to get?
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Old 08-16-2012, 08:17 PM   #13
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Read the above posts: You're running stock injectors. They're too small for anything above 3-5psi or so. That's why you're running out of fuel. You can buy all kinds of other things, but the problem is injectors.
Buying a bigger pump won't help- only increasing the fuel pressure would help. And that's a band-aid at best. In order to increase FP you need an FPR. But get injectors instead and be done.
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Old 08-16-2012, 09:54 PM   #14
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I Will try to find some RX8 injectors andFPR too. Problem should be solved for good.
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Old 08-16-2012, 11:08 PM   #15
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Quote:
Originally Posted by joyrider View Post
I Will try to find some RX8 injectors andFPR too. Problem should be solved for good.
Just need to buy fuel injectors for more fuel, don't worry about a fpr
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Old 08-17-2012, 12:26 AM   #16
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Quote:
Originally Posted by joyrider View Post
2000 LS, turbo Begi gt2560, stock injectors, stock fuel pump and fuel pressure, 13.2 req fuel in tunerstudio.
That's not very smart or useful. Get 460's at least, before your engine grenades.
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Old 08-17-2012, 10:46 AM   #17
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Bought Injector Dynamics 1000cc. Have to drive 2 hours to get them this afternoon.

Dead Time supposed to be 1.0ms.

What Will be the new req fuel ? I think 3,4 but I m not sure.
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Old 08-17-2012, 01:42 PM   #18
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Quote:
Originally Posted by joyrider View Post
What Will be the new req fuel ? I think 3,4 but I m not sure.
Tunerrstudio/Megatune will calculate that for you on the req_fuel.
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Old 08-17-2012, 02:41 PM   #19
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Quote:
Originally Posted by joyrider View Post
Bought Injector Dynamics 1000cc. Have to drive 2 hours to get them this afternoon.

Dead Time supposed to be 1.0ms.

What Will be the new req fuel ? I think 3,4 but I m not sure.
Best injectors on the market. You did good picking them up.
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Old 08-18-2012, 07:43 AM   #20
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Idle is rough but i was only able to change the req fuel to 3.4 because the laptop died.

Going back atm.

Edit: injector 2 don t fire, 12V on white blue but where the hell does the purple / Green wireconnect?

Edit 2; wire going to 4x and to sequential injection board. Seems like thé board is defective. Will try to put it in batch mode.

Last edited by joyrider; 08-18-2012 at 11:46 AM.
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