Let's talk fuel injectors!

scarless · Jun 23, 2005

final5-0 said:
I've been right with you and agree with all you've said up until now, so maybe I'm not understanding what your saying but....................

My point was that unless his combo gets close to the 300HP level and is running lean at high rpms, or pegs the MAF, that he wouldn't need to upgrade to 24# and a new MAF. I guess I didn't say it that well. I don't have a problem with fuel pump upgrades, I just don't see most people needing more than a 155lph pump. The below calculator says that a 155lph pump will feed an engine up to 500HP. The stock 94-95 90lph pump should support up to 280HP, flywheel not rear wheels!

Here are some fun calculators.
http://www.hardcore50.com/members/calculators.htm

scarless · Jun 23, 2005

I'm in process of building an engine for my vert. I'm hoping for 320HP at the flywheel and 255HP at the rear wheels, AODE need I say more? It's a budget Explorer/GT40/P-heads build up. And yes, I'll need a new fuel pump.

WhiteDevil · Jun 23, 2005

i put 250rwhp with stock heads and cam(but everything else in the sig) on my car. With a 255lph fuel pump aeromotive FPR set at 43psi and 19# inectors.

scarless · Jun 23, 2005

12's nice. :worship: So you are still running 19# injectors with 298rwhp?

final5-0 · Jun 23, 2005

scarless said:
My point was that unless his combo gets close to the 300HP level and is running lean at high rpms, or pegs the MAF, that he wouldn't need to upgrade to 24# and a new MAF. I guess I didn't say it that well. I don't have a problem with fuel pump upgrades, I just don't see most people needing more than a 155lph pump. The below calculator says that a 155lph pump will feed an engine up to 500HP. The stock 94-95 90lph pump should support up to 280HP, flywheel not rear wheels!

Here are some fun calculators.
http://www.hardcore50.com/members/calculators.htm

I thought we were on the same page, so to speak.

I saw a pretty low post count...glad you came over to the site

Later
Grady

WhiteDevil · Jun 23, 2005

scarless said:
12's nice. :worship: So you are still running 19# injectors with 298rwhp?

No, when i upgraded the heads and cam i put in 24# injectors

scarless · Jun 23, 2005

I'm usually over on corral.net. I'm over here some times.

scarless · Jun 23, 2005

WhiteDevil said:
No, when i upgraded the heads and cam i put in 24# injectors

I didn't think so. That much HP would be really mean cranking up the pressure.

final5-0 · Jun 23, 2005

CManT1914 said:
Thanks a bunch Grady! I suspected 24's would not be up to par for my setup, so I decided to go with some 30's. I bought some FRPP 30's today on eBay for quit cheap too. I will DEFINITELY be getting a custom tune once I get my MAF recaled (can't use my injectors til that happens ). Until then, I'll run stock 19's and bump the fuel pressure to around 60. Hopefully I won't have to do that for long, but we'll see. Thanks again!

Chris

Its quite common to see starter blower kits come with fmu's which work with elevated fuel pressures. I've heard so many tuners and their customers talk about how things got better when they ditched the high fuel pressure method and got a maf and set of inj's which were more suited for the combo and got the pressure back down to stock levels.

Our topic of discussion is not really that different from the above example and IMHO, the same principle would apply when talking fuel pressure.

I was just trying to say that elevated pressure method works and peeps do it every day but it is my second choice to a custom tune.

I can't fault anybody for wanting to see if they can get around a custom tune by trying mechanical tuning methods.

Like scarless said, larger inj's & mafs can pose a prob or two for you

I really like all the benefits you get from our pcm controlled cars ....

However

Its such a shame that its so costly to be able to make changes in that little silver box.

Later
Grady

CManT1914 · Jun 23, 2005

final5-0 said:
Chris

Its quite common to see starter blower kits come with fmu's which work with elevated fuel pressures. I've heard so many tuners and their customers talk about how things got better when they ditched the high fuel pressure method and got a maf and set of inj's which were more suited for the combo and got the pressure back down to stock levels.

Our topic of discussion is not really that different from the above example and IMHO, the same principle would apply when talking fuel pressure.

I was just trying to say that elevated pressure method works and peeps do it every day but it is my second choice to a custom tune.

I can't fault anybody for wanting to see if they can get around a custom tune by trying mechanical tuning methods.

Like scarless said, larger inj's & mafs can pose a prob or two for you

I really like all the benefits you get from our pcm controlled cars ....

However

Its such a shame that its so costly to be able to make changes in that little silver box.

Later
Grady

I think I figured it out. My friend Jesse told me there should be some dyno shops around here locally that can recal my MAF. If so, then I'll go ahead and get it recaled and throw on the 30's at the same time as the buildup. OR I can leave the stockers in there, and bump the fuel pressure to acheive the results, but I will only do that temporarily since I am planning on getting a custom tune. OR I might just get a C&L kit caled for the 30's, and while it's on there, send in my Pro-M for recal. Once I get the Pro-M back, then I'll just resell the C&L. That's definitely the more costly of the three, so I'll do that as a last resort. Thanks again though!

Let's talk fuel injectors!

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