Fuel pump question
08-08-11, 02:57 PM
#1
Rotary
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Fuel pump question
Well I have a stock s4tII with a stock jdm tII motor. I installed a walboro 255 but it continues flooding (stock ecu ) do I need to install a fuel regulator?
Thank you guys once again
Thank you guys once again
08-08-11, 03:04 PM
#2
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Well you probAbly made your flooding issue worse by installing the pump, as it allows for more flow to the engine. Go back to stock, reduce your fuel ratio, and you should be fine. Theres a little black box by the stock airbox with an empty cylinder next to it that you can fit a small flat head into and itll have markings on the rearward side that have a double sided arrow and an L and an R (lean and rich). Just turn it a little more towards to the lean and it'll "aid" in preventing flooding.
08-08-11, 05:17 PM
#4
The variable resistor has no effect on start up fuel. It only affects idle mixture. To reduce the amount of fuel delivered during cranking you need a programmable ECU or standalone EMS.
An FPR would allow you to bring fuel pressure back down to stock levels (~38-40 psi with no pressure/vacuum applied), but it won't prevent flooding if you had it before upgrading the pump.
Another possibility is leaky injectors, which could be fixed by getting them serviced.
An FPR would allow you to bring fuel pressure back down to stock levels (~38-40 psi with no pressure/vacuum applied), but it won't prevent flooding if you had it before upgrading the pump.
Another possibility is leaky injectors, which could be fixed by getting them serviced.
08-08-11, 09:40 PM
#6
Rotary Enthusiast
+1 on leaky injectors. if you dont need your car for about a week. Send them to witchhunter and have them cleaned. I have a walbro and it hasnt caused flooding. (usdm). probably leaky injectors though
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08-09-11, 01:41 AM
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), i turned it to near enough full lean just to try and get the damn thing to pass and it did lower my hydrocarbons down about ten points... not meaning to thread jack, but why would that be if it only affects idle mixture? Remember that my car has to be dyno tested for its age group.
08-09-11, 07:28 AM
#9
Rotary
Thread Starter
Ok thanks guys I will look into the injectors of the rx7 as always I greatly appreciate the info and the help. I'd it wasn't for you guys I don't think my car would be running at all...
08-09-11, 12:34 PM
#10
Here's a thread that goes into detail about the amount of cranking fuel relative to water temperature: https://www.rx7club.com/2nd-generation-specific-1986-1992-17/looking-car-has-hot-start-problems-499744/.
Probably just differences between runs. In the past, I've had my car fail a 15/25 mph test, but then pass on a 2nd try. Nothing changed between the runs.
Ah thanks for the heads up! We learn something new every day... also, i noticed it had an effect on my emissions output (I have to pass in my county ), i turned it to near enough full lean just to try and get the damn thing to pass and it did lower my hydrocarbons down about ten points... not meaning to thread jack, but why would that be if it only affects idle mixture? Remember that my car has to be dyno tested for its age group.
), i turned it to near enough full lean just to try and get the damn thing to pass and it did lower my hydrocarbons down about ten points... not meaning to thread jack, but why would that be if it only affects idle mixture? Remember that my car has to be dyno tested for its age group.
08-09-11, 02:34 PM
#11
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Here's a thread that goes into detail about the amount of cranking fuel relative to water temperature: https://www.rx7club.com/showthread.php?t=499744.
Probably just differences between runs. In the past, I've had my car fail a 15/25 mph test, but then pass on a 2nd try. Nothing changed between the runs.
Probably just differences between runs. In the past, I've had my car fail a 15/25 mph test, but then pass on a 2nd try. Nothing changed between the runs.
its been forever since i messed with the idle mixture, it does matter, but we don't test @idle in CA
08-09-11, 03:40 PM
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funny story. i bought a 79 Rx7, with a THERMAL reactor. i have a foggy notion of how this thing works, but i just set the idle mixture with my nose, and it seemed ok. i drove it over to the smog place on the freeway, i got it HOT, we pretested it, and it passed with flying colors. he shut it off for 30 seconds while the somg machine dialed up the DMV (yes, dial up), and then restarted it to do the test and it almost failed....
the THERMAL reactor needs to be HOT! it is appropriately named
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