How many psi should I run street/strip? I don't want to burn out my fuel pump though.

MODS:
ram air,k&n,t.b.airfoil,gutted mas,t.b. bypass,holley afpr,k&n fuel filter,msd cap/rotor/coil,8.8 wires,plugs,flow cat-back

SOON:
slp runners,msd 6a,edelbrock headers,high flow cats

 

I have similar mods and have a regulator on the way in the mail.

I am setting mine to 52PSI with the hose off. I am doing this because the adaptive learning of the computer will soon recognize an overly rich condition and adjust the injector pulsewidth to compensate. Thus, the effectiveness of the AFPR is in the spray pattern of the injectors rather than the added fuel. The injectors atomize the fuel better at high PSI which also creates a wider spray pattern making the combustion process speed up in a sense.

I will re-post when I get mine on and tell you what improvement it makes,if any.

------------------
Mike L.


1987 IROC Z 5.7 TPI A4 3.27 Borg-Warner
four wheel disc

Mods:[i] 2300-2500 Stall Converter, Shift Kit(GM parts), TPI Specialties Stage 3 PROM, Modified Airbox w/ K&N's, homemade cold air, Relocated MAT sensor, Gutted MAF, 160* thermostat, MSD 6A, Accel 8mm Wires, bypassed TB coolant, Flowmaster 3 chamber single 3" in/out muffler,cutout. 3" MAC mandrel intermediate, custom dual !cat Y-pipe. airfoil, ported plenum. !smog, few others I forgot...???

**BOYCOTT LAPEER DRAGWAY**

 

I currently fun at 48psi but after my engine mods I'll bump it up to 50 or 52psi.

Regards

Rob

 

I currently run at 48psi but after my engine mods I'll bump it up to 50 or 52psi.

Regards

Rob

 

it isnt bad to run the fuel press that high (above 50)? doesnt it put strain on the fuel pump?

 

It is bad to run at 52 psi on the stock fuel pump. It will burn it out over a short period of time. But at the strip for a couple runs I don't see a problem. I think im going to set mine at 42 psi for hunting mustangs and 48 psi at the strip. Thanks for all the help guys!

irocz28tpi your advice sounds like it might work better email me with your results

[This message has been edited by 89_G92_Iroc (edited November 27, 2001).]

 

The ECM will only compensate on the O2 sensor in closed loop - and then there are limits before it throws an SES code. In WOT, you run only off your tables and various sensor reading. The ECM doesn't compensate at all for the extra fuel pressure. That is why you need to burn a new eprom to take full advantage.

And if your engine wasn't too lean before, you will be too rich. On the mods listed, you will be too rich as the stock GM eprom is overly rich by design and you don't have enough mods to require extra fuel.

 

I have a Holley 45 PSI in line pump. I am assuming with an AFPR that I can only set it to 45PSI, is this correct?
The Pump flows 255lph.

------------------

WS6 Trans Am.

View My Ride @ thirdgen.org

 

no. that is the rated flow at that psi. it will flow less as the pressure is raised

 

What AFPR's are you guys using?!? I have to replace my injectors sometime this winter and figured while I'm at it I might as well put one a AFPR in too.



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1987 Camaro IROC-Z
350 TPI (L98), HyperTech Airfoil, K&N Filters and modified airboxes, AC Delco RapidFires, Taylor SpiroPro 8mm wires, Energy Suspension polyurethane bushings for front and rear LCAs and sway bars, KYB struts and shocks, BFG g-Force Z-rated tires, MAC STB, MAC SFCs, JET low temp stat, CarSound Hi-flow Cat, 3" Mandrel-bent pipes, Flowmaster muffler, Corvette Servo, TransGo Shift Kit, Corvette 2000 Stall, TruCool LPD tranny cooler, T-tops.

2001 Sunfire GT
2.4L, 5-speed, K&N cone filter, interior detailing, 200W Monsoon Sound System (8 speakers), Silver Metallic exterior with grey interior.

Web: http://www.angelfire.com/on3/whitelightening

 

i'm using the hypertech. they're all about the same though.



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mrrjjdh03@aol.com moderator at www.fl-thirdgen.org

 

That's about what I figured. I've heard some people talk about mounting an Accel gauge on the fuel rail...is this hard to do and is it worth my while? I've already fuel pressure tester, but I think it might be nice to have the gauge there for ease of use. And can you order this throught Accel or sometime?



------------------
1987 Camaro IROC-Z
350 TPI (L98), HyperTech Airfoil, K&N Filters and modified airboxes, AC Delco RapidFires, Taylor SpiroPro 8mm wires, Energy Suspension polyurethane bushings for front and rear LCAs and sway bars, KYB struts and shocks, BFG g-Force Z-rated tires, MAC STB, MAC SFCs, JET low temp stat, CarSound Hi-flow Cat, 3" Mandrel-bent pipes, Flowmaster muffler, Corvette Servo, TransGo Shift Kit, Corvette 2000 Stall, TruCool LPD tranny cooler, T-tops.

2001 Sunfire GT
2.4L, 5-speed, K&N cone filter, interior detailing, 200W Monsoon Sound System (8 speakers), Silver Metallic exterior with grey interior.

Web: http://www.angelfire.com/on3/whitelightening