Project B - 1991 3400 OBII 5-Speed

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Re: Project B - 1991 3400 OBII 5-Speed

Postby 3X00-Modified » Thu Jul 09, 2015 7:52 am

What bin file is flashed to the ECU? What injectors are you running? and did you adjust for different injectors in the bin if you did change them?



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Re: Project B - 1991 3400 OBII 5-Speed

Postby Luckymc420 » Thu Jul 09, 2015 9:25 am

1988gtu - I have been thinking fuel problems from the beginning. The engine is a 3400 but has 3100 injectors in it. (17lbs) FPR is set at 0.4591472. The only thing that I'm not sure about it do I set it to my injectors or the engine size. Also the car had a 2.2L 4 banger in it. Fuel pump never was changed. I'm wondering if it can't handle the volume. Before I left last night I did get a fuel pressure reading. 26 psi and bleeds off to 21psi. This is just the prime pressure. Running it gets to 38psi. I don't have my manual at work so I'm not sure if that is alright.

Moneypit - I'll adjust the clamps tonight. They are tight. Had to cut out some of the boot to get the MAF on.

Mod - Flashed a 1996 Beretta BIN file. 17lbs 3100 injectors. No mods done to engine.
Last edited by Luckymc420 on Thu Jul 09, 2015 9:29 am, edited 1 time in total.



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Re: Project B - 1991 3400 OBII 5-Speed

Postby 3X00-Modified » Thu Jul 09, 2015 9:28 am

It should reach over 40PSI with prime pressure. 26 is way too low. And what do you mean by do you set it to your injectors or your engine size? The table is for Injector Flow Rate. It should read the value that comes stock for a 96 OBDII Beretta since your using stock injectors. In the end they will be slightly undersized for peak power but that should not change starting or idle quality.



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Re: Project B - 1991 3400 OBII 5-Speed

Postby Luckymc420 » Thu Jul 09, 2015 9:42 am

I get what the table is, but I was thinking if the injectors are smaller than the stock 3400s then increase the flow rate to make up the difference. Still learning. But seems like I have fuel pressure problem so I'll check that out tonight.



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Re: Project B - 1991 3400 OBII 5-Speed

Postby 3X00-Modified » Thu Jul 09, 2015 11:22 am

It's a static value of the part itself... don't enter the value in wrong otherwise it will have to correct elsewhere. Telling the ECU it can flow more when it really cant only makes it run worse because it will shorten the pulse width when trying to start until it learns it needs to re-widen it to compensate for the incorrect flow rate.



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Re: Project B - 1991 3400 OBII 5-Speed

Postby 1988GTU » Thu Jul 09, 2015 11:23 am

Good maintenance upkeep in fuel filter replacement is always last to be done; How old is your fuel filter?

2.2L pump will support a stock 2.8/3.1/3100/3400 no problem. IIRC, the flow rate is the same or real close to the 3.1 V6 pump.


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Re: Project B - 1991 3400 OBII 5-Speed

Postby Luckymc420 » Thu Jul 09, 2015 12:06 pm

Mod - Good to know. Is it like a calibration code...

1988gtu - I actually just bought one. I was going to start with replacing the filter and work my way up. Filter is plenty old on time, but it doesn't have much run time. Good to know about the fuel pumps.



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Re: Project B - 1991 3400 OBII 5-Speed

Postby Cliff8928 » Thu Jul 09, 2015 1:43 pm

1988GTU wrote:2.2L pump will support a stock 2.8/3.1/3100/3400 no problem. IIRC, the flow rate is the same or real close to the 3.1 V6 pump.


Only if it's a MPFI. A 2.0/2.2 TBI (87-91) pump would only see 20 or so PSI if you're lucky.


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Re: Project B - 1991 3400 OBII 5-Speed

Postby Luckymc420 » Thu Jul 09, 2015 4:16 pm

I think Cliff is correct. According to the manual for the 2.2 fuel pressure should be at 20 max. I have even looked up fuel pumps for the 91 2.2L and they spec out at 20 psi max. While the 96 3100 max out at 90 psi. 41-47 is in range. Looks like I will buying a fuel pump.



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Re: Project B - 1991 3400 OBII 5-Speed

Postby 1988GTU » Thu Jul 09, 2015 4:18 pm

Good to know. The 2.2's I've tested fuel pressures on were not virgin's and probably had a pump replaced with what ever was ots.


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Re: Project B - 1991 3400 OBII 5-Speed

Postby 1988GTU » Thu Jul 09, 2015 4:19 pm

Luckymc420 wrote:I think Cliff is correct. According to the manual for the 2.2 fuel pressure should be at 20 max. I have even looked up fuel pumps for the 91 2.2L and they spec out at 20 psi max. While the 96 3100 max out at 90 psi. 41-47 is in range. Looks like I will buying a fuel pump.

The injector spray pattern should give even more proof.


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Re: Project B - 1991 3400 OBII 5-Speed

Postby Luckymc420 » Thu Jul 09, 2015 4:40 pm

I would assume the spray would be droplets and not fully atomized. I will order the fuel pump when I get home.

I wanna do a quick log if I'm able too.



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Re: Project B - 1991 3400 OBII 5-Speed

Postby Luckymc420 » Mon Jul 20, 2015 11:11 pm

Been busy doing side jobs to help fund the car project. Timing belts up the ace!

So I have been looking around and seeing what my options are. I am thinking about getting a inline fuel pump. Finding a FP to fit my tank and the pressure I want is proving to be a pain. Any ideas?



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Re: Project B - 1991 3400 OBII 5-Speed

Postby 3X00-Modified » Tue Jul 21, 2015 8:30 am

Um what?? Walbro drop in pump... Done... I'm running 12's with one...

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FPG169 - kit & HP 255 pump [F20000169]- $114

http://www.autoperformanceengineering.c ... papps.html

If that doesn't fit your needs then I don't know what will.



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Re: Project B - 1991 3400 OBII 5-Speed

Postby Asylum » Tue Jul 21, 2015 8:55 am

AGAIN... everybody wants to over think the damn fuel pump.

I ran mid 13's N/A on a 20 year old, original stock 3.1 pump on my much modified 3500.

6700 RPM shift points and it never missed a beat!

Maybe you have to go to the dealer and ask for the Canadian Spec unit! ROFL!

Jeesh

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'92 3500 GT gone and not really missed. It was fun. Documented 13.47 N/A.


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