Problems with Fullthrottle AFPR
#174526
July 05, 2004 07:14 pm UTC
July 05, 2004 07:14 pm UTC
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Posts: 631 Scarborough, ON
Chris Krawczyk
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Since I didn't get much replies from fullthrottletech.com I'll try this here.
I got their bolt on AFPR and have experienced the following problem. After setting the base pressure with the vacuum line off (37psi) I went for a spin. When I came back the engine was nice and warm, and the pressure dropped to 28psi with the vacuum line off. I have readjusted the base pressure and left the car for the night. Next morning I the pressure was higher around 45 psi or so (when the engine was cold). Is this normal or the thing is busted?
IM using summit racing 0-60 liquid filled gas pressure gauge. The gauge is attached to the AFPR. Also IM using a walbro 255 hp that was installed at the same time as the AFPR. Could it be that the fuel pump is producing less PSI after it warms up? If yes would that matter?
1990 Eagle Talon, TSI AWD - SOLD 2002 Mazda Pro 5
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Re: Problems with Fullthrottle AFPR
#174528
July 05, 2004 11:51 pm UTC
July 05, 2004 11:51 pm UTC
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Posts: 631 Scarborough, ON
Chris Krawczyk
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I got a reply from Mike from Fulltrhottle, and he sugests the same thing (bad gauge or fuel pump). It could be the gauge, hopefully not the fuel pump since it is brand new. Does heat effect gauges hat much? I did a litle experiment today.
Pressure measured with vacuum line disconnected.
1) Start idling from cold, pressure 47psi (yesterday it was set at 37psi when the engine was hot) Voltage at the pump is 13.72V
2) Engine warmed up idling (at 192 deg), AFPR and gauge is still cool to touch (the hood was open), pressure 46.5psi.
3) Went for a spin, AFPR and gauge is warm to touch, pressure 39psi. Voltage at pump 13.5v
The pressure did not come back to 37psi as yesterday but it was colder outside, and the AFPR was warm to touch, not hot like it was yesterday.
1990 Eagle Talon, TSI AWD - SOLD 2002 Mazda Pro 5
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Re: Problems with Fullthrottle AFPR
#174529
July 06, 2004 02:08 am UTC
July 06, 2004 02:08 am UTC
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Joined: Mar 2001
Posts: 1,832 Toronto, On, Canada
Dave Dziarmaga
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I had the same symptons with my spoolinup afr(it was made by the same people who made the fullthrottle afr), i was re-adjusting the fuel pressure everyday for like a week, eventually it settled down and everything was fine.
1993 Talon TSi AWD, if in doubt, increase boost. I've got a fever, and the only perscription is more cowbell! -Bruce Dickenson for sale: my talon
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Re: Problems with Fullthrottle AFPR
#174530
July 06, 2004 01:05 pm UTC
July 06, 2004 01:05 pm UTC
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Joined: Apr 2002
Posts: 631 Scarborough, ON
Chris Krawczyk
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Interesting. Dave did you readjust when engine was cold or warm? Did you see such a big difference in psi between one adjustment and the other?
1990 Eagle Talon, TSI AWD - SOLD 2002 Mazda Pro 5
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Re: Problems with Fullthrottle AFPR
#174533
July 06, 2004 10:25 pm UTC
July 06, 2004 10:25 pm UTC
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Joined: Mar 2001
Posts: 1,832 Toronto, On, Canada
Dave Dziarmaga
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Originally posted by Chris Krawczyk: Interesting. Dave did you readjust when engine was cold or warm? Did you see such a big difference in psi between one adjustment and the other? Both, when it was cold and warm. It was around a 5-7psi drop.
1993 Talon TSi AWD, if in doubt, increase boost. I've got a fever, and the only perscription is more cowbell! -Bruce Dickenson for sale: my talon
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Re: Problems with Fullthrottle AFPR
#174534
July 08, 2004 11:54 am UTC
July 08, 2004 11:54 am UTC
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Posts: 631 Scarborough, ON
Chris Krawczyk
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I tested another fuel gauge with my AFPR, and it was reading very close to my gauge, maybe 2psi less. (not to sure since this gauge had worse scale). In any case it was reading 45Psi instead of 39psi like the night before. I have readjusted it again. The saga continues . Dave how long did it take you to get it right? Any other people with this AFPR?
1990 Eagle Talon, TSI AWD - SOLD 2002 Mazda Pro 5
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Re: Problems with Fullthrottle AFPR
#174535
July 08, 2004 10:19 pm UTC
July 08, 2004 10:19 pm UTC
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Joined: Mar 2001
Posts: 1,832 Toronto, On, Canada
Dave Dziarmaga
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It took around a week for it to settle down. Is the screw backing out maybe? Or you can try a stiffer spring.
1993 Talon TSi AWD, if in doubt, increase boost. I've got a fever, and the only perscription is more cowbell! -Bruce Dickenson for sale: my talon
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