AP1 MPG is terrible... why?

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Jul 16, 2013 | 03:54 AM

#21

sata3000

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Joined: Jan 2010

Posts: 2,114

Likes: 1

try a new gas cap....

Jul 16, 2013 | 04:16 AM

#22

d-bo

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Joined: Mar 2012

Posts: 1,093

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My rule is start with the cheapest stuff that may be the culprit

Try the gas cap thing.

If its not that I would definitely get a wideband. You can pick up a used one or one for under200 new

Jul 16, 2013 | 04:30 AM

#23

s2000442

Joined: Dec 2007

Posts: 2,274

Likes: 5

From: Midwest

Quote:

Originally Posted by VegasS2K

thanks

its running a walbro 255 pump. that freaking whine is annoying the hell out of me... my EK had the same pump but was in tank under the seats so it wasnt as loud. i have a set of RC SL4-650 that came off my EK build. would those work for this setup? or are they too low of CCs?

Ditch the walbro pump and get a 340 Fullblown fuel pump. Annoying wine will be gone.

Jul 16, 2013 | 04:43 AM

#24

CoolGuy094

Registered User

Joined: Jan 2011

Posts: 4,624

Likes: 10

Quote:

Originally Posted by s2000442

Quote:

Originally Posted by VegasS2K' timestamp='1373835720' post='22665393

thanks

Ditch the walbro pump and get a 340 Fullblown fuel pump. Annoying wine will be gone.

This is true, I just did the same.

Also, look into FID injectors to save some $$ over the ID's if you want.

Jul 16, 2013 | 03:52 PM

#25

s2000Junky

Community Organizer

Joined: Jun 2007

Posts: 31,070

Likes: 566

Quote:

Originally Posted by VegasS2K

I have a 2002 AP1 S2000

Mods
Vortech V3 SC trim
Vortech powercooler
6 PSI
AEM stand alone
OEM cat
Greddy catback
Ap2 Diff
Stock injectors with vortech riser
Mishimoto radiator

I have been reading on the MPG of supercharged S2ks, and it seems people average between 20-26 mpg.

My S2k is getting 15 mpg combined street/highway.

Why would it be getting such garbage MPG?

It seems to not matter between civilized or harsh driving. I did a test and with no harsh boosting it only got 16mpg.

I suspect its the fact that you are still using a rising rate fpr with your tune. You should get rid of the rising rate fpr and stock injector set up for a set of very efficient ID 1000 injectors and get a conventional tune with your AEM EMS, no matter what boost your running. This will be more efficient. You are not running the most efficient set up by increasing a rising rate fuel pressure (which is typically inconsistent) all wile trying to fill in an obscure duty cycle around that inconsistent fuel pressure. You are effectively over complicating the tune this way and not for the sake of benefit, but rather diminishing efficiency. I wouldn't be surprised if you were running too lean and too rich both in parts of your tune, or just too rich as overcompensation to be safe by your tuner, but that casing poor MPG. So again ditch the rrfpr and get some efficient injectors like the ID 1000 and then get a re tune.