Jump to content
SAU Community

Recommended Posts

Hey guys. Decided to upgrade my fuel pump for e85. Was running a walbro 255 on stock wiring and working fpcm. Was feeding 250rwkw with AFR in the low 11's top end no problems.

I upgraded to dw340 lph e85 pump. Installed in same configuration as walbro and went for test drive. Ran well but was leaning out, top end AFR of 13+ was occurring. Was thinking this pump requires more voltage.

I went back home and rewired the pump with a 30 amp relay and wiring to the battery. Went for test drive again and ran well cruising around but extremely rich when on boost, I saw AFR of low 9's. Ran like shit, WTF.

Not sure what's going on.

I was assuming that my stock fpr would cope. Is it not able to?

Is it because I had the car tuned with the fpcm and now running without?

Maybe the walbro was weak and the car was tuned on low fuel pressure?

Any ideas and advice or explanation of what's occuring appreciated.

Remember the check your rubber fuel return line in the engine bay for a restrictor, it feels like a hard bump, mine was down near the damper that turns 90deg. My rail pressure was out of control with a walbro 460 because of the restrictor.

Remember the check your rubber fuel return line in the engine bay for a restrictor, it feels like a hard bump, mine was down near the damper that turns 90deg. My rail pressure was out of control with a walbro 460 because of the restrictor.

Thanks for that, I'll have a look tomorrow.

Had another play around this morning. Couldn't find any restrictor in the return line. I went back to stock wiring, same lean result. I then grounded the pump -ve to take out the fpcm circuit and back to extremely rich again. At this point I'm thinking about putting the walbro back in, checking AFR again and seeing if the wiring changes have the same effect.

If the same thing happens I'm thinking possibly the fpcm is stuck in low voltage mode and was tuned like that. Thoughts please.

Moving forward, to correct the rich conditions with direct power, retuning will be required. Correct?

I had the same issue when I swapped out a Walbro pump for a Nismo. Even though both pumps are quoted as a similar flow rate, the Walbro flowed significantly less - I had to take around 10% of fuel out of the tune to correct the Air/Fuel ratio change.

I had the same issue when I swapped out a Walbro pump for a Nismo. Even though both pumps are quoted as a similar flow rate, the Walbro flowed significantly less - I had to take around 10% of fuel out of the tune to correct the Air/Fuel ratio change.

Where your idle and cruise AFR OK or rich. Mine are fine, its only when on boost. I'm pretty hesitant on playing with the map myself at this stage. Did you take fuel out of the whole map or just parts of it?

I had the same issue when I swapped out a Walbro pump for a Nismo. Even though both pumps are quoted as a similar flow rate, the Walbro flowed significantly less - I had to take around 10% of fuel out of the tune to correct the Air/Fuel ratio change.

the std fpr should adjust for this. sounds like your walbro was lazy.

Stupid question maybe, but can't you just adjust you base fuel pressure off your fuel regulator.

Yep stock reg isn't adjustable but my idle and cruise are fine so even if I could adjust fpr it probably would lean out the idle too much.

Where your idle and cruise AFR OK or rich. Mine are fine, its only when on boost. I'm pretty hesitant on playing with the map myself at this stage. Did you take fuel out of the whole map or just parts of it?

Yeah the idle and light cruise wasn't too far off, the on boost part of the map required the largest change

Thanks for all the replies guys[emoji106] . I had a quick play with the master fuel trim and took out 20% fuel and it was still pig rich on boost. Time for professional help as I don't feel like losing a perfectly good engine due to me stuffing around with it, I also need the maps to be spot on as it will be the base for my flex tune. I'll update when I get it sorted.

  • Like 1
  • 2 weeks later...

Just had the car retuned properly and it appears the old walbro was indeed on the way out. Now the shape of the map is a lot flatter, idle is better than ever, throttle response feels sharper and more importantly the car made an extra 12rwkw bringing it up to 260[emoji3], not bad for a HG 21u h/flow turbo. AFR is rock solid now across all gears and plenty of extra fuel available for e85 goodness.

  • Like 1

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • PayPal is a safe, online payment system that enables businesses and individuals to safely send and receive money, making it an indispensable tool in both personal and professional contexts. However, many users wonder how to send money on PayPal? Don't be alarmed if PayPal is new to you - all the steps can be found by visiting merchant sites with links marked "Pay or send money". Once clicked, select payment method, amount, and add message or note for recipient(s). Upon successful transaction completion you will receive an email containing details of transaction. Let’s start by understanding how PayPal works, how money transfers from banks to PayPal and using various payment methods. Moreover, to transfer money between PayPal and bank, head to the Wallet section and click "Add Account", selecting either "Transfer within seconds with debit" or "Transfer between 3-5 days with bank", and following any instructions shown on screen until completed successfully.   How to Send Money Over PayPal: The Basics Before sending money through PayPal, first create an account. Here is how to set-up a PayPal account: ·         Click “Sign Up” on either the PayPal website or app to enter your basic information such as email address or name into their system. ·         Link your bank account, debit card or credit card directly with PayPal so you can fund transactions directly using these accounts. ·         Verifying your PayPal account will enable you to send and receive more funds. Typically, PayPal requires that you verify your credit card or bank account by making small deposits into it. ·         Once your PayPal account has been established, you can send money through it.   How Do I Send Money to Someone on PayPal? After creating a PayPal account, you can easily send money through it. Here is how to send money to someone on PayPal: ·         First of all log into your PayPal account ·         Once on your dashboard, click on "Send & Request Tab." ·         After this enter the recipient's email or mobile phone number. ·         Enter the amount you wish to send to someone. ·         At last, recheck all the details and click "Send Payment" to complete your transaction if everything looks in order.   How Can I Send Money PayPal for Goods and Services? PayPal provides a safe method for individuals and businesses alike to transfer funds online, both personally and commercially. When paying for goods or services there are additional protections in place both for buyers and sellers. PayPal Buyer Protection offers you peace of mind when paying for products or services with PayPal. In the unlikely event that there is an issue with a transaction, if there are any discrepancies you may dispute it and be eligible for a possible refund. You need to follow the same steps to send money, but select Paying for Services or Goods when prompted. In fact, this extra layer of protection will keep your account safe from fraudulent attacks.   How to Transfer Money to PayPal from Bank? Here is how to transfer money from PayPal from bank: ·         Log into PayPal using either its app or website. ·         Click "Add Funds" in the Wallet section, and add money directly from your bank to your PayPal account. ·         If you have linked your bank account with PayPal, select it under Funding options to select it as your funding option. ·         Enter the amount you would like to transfer to PayPal from your bank balance. ·         Click Add Funds. It typically takes several days for funds to arrive on your PayPal account.   FAQ How can I send money PayPal? Log into your PayPal account, select "Send and Request," enter in your recipient's phone number or email address, select the amount due, payment method of choice and click on "Send Now" - quickly and safely sending money via PayPal is now an efficient method of money transfers!   How do I transfer money to PayPal from a bank? Log into PayPal and select "Add Funds" to transfer money from your bank to PayPal. Select your account number, input an amount, and confirm it. Though the transfer may take up to several days for completion.   How do you send money to someone on PayPal? Simply log into your PayPal account, select "Send and Request", enter the recipient's phone number or email address, select the amount to send, and click "Send Now".   How can I receive payment through PayPal? Senders can easily accept payments with PayPal by providing your PayPal email address and being notified via email when a payment has been completed. When funds appear in your PayPal account, they will appear instantly!
    • At least yours have parkour down pat. One of mine will still trip over his own shadow and fall over... He's a special type of cat... Ha ha ha
    • The question then becomes - was there any fluid coming from that hole before you did the rebuild ?    You may not have noticed, of course.   Depending on how you did the rebuild, the possibility has to be considered that somehow (cleaning ?)  fluid entered that hole and is now being 'forced'  out by small movements of the proportioning valve.   From the factory, there's actually a small rubber plug in that hole but with age and under-bonnet heat it's quite common for it to 'go missing'.  That rubber plug is designed to allow the venting process but also to prevent 'stuff' getting to the area (prevent corrosion, etc).   The plug is also not available as a spare part AFAIA. Personally I wouldn't race and buy a new master just yet but keep an eye on the area to see if the 'leak' continues.   If you're concerned about brake fluid damaging nearby paintwork, cable tie a piece of suitable absorbant material over the hole and remove/monitor occasionally.    Operation of the proportioning valve and the brake master itself won't be affected, but also keep an eye on brake fluid level, of course. In terms of a new master, the genuine part is getting expensive, unfortunately.  Amayama is showing AUD900+.   I was searching recently and there's an aftermarket part available from Japan made by 'Parts Assist': https://zenmarket.jp/en/yahoo.aspx?q=BNR32%2bBM50&p=1 Whether it's any good I have no idea, although in my experience Japanese aftermarket stuff is pretty good quality-wise.   The above site allows overseas buyers to purchase stuff more easily from Japan but there are fees and shipping costs, of course.   The original Japanese seller page is here: https://auctions.yahoo.co.jp/jp/auction/p1197401228 Copper/Nickel is fine but I still prefer bundy tube and it's also cheaper.
    • Your chihuahuas look weird!
×
×
  • Create New...