I've got a TD05 20g on my car and currently have an Evo IX pump installed. It is NOT rewired. I'm not sure of the signs showing that I'm running out of pump, but it seems to lean out every now and then while doing a pull.

Mod list is as follows:

TD05 20g set at 20-22 PSI
VRSF FMIC
Evo IX Fuel Pump
950cc injectors
Full 3" exhaust
EcuFlash

For diagnostic purposes, I currently have all fuel cells set to 11:1 AFR to make sure my wideband is reading correctly. When I do a 2nd-3rd-4th pull, it often spikes to around 12.5:1. However, it usually stays right around 11:1 (+/- 0.3). Does this mean I'm out of pump? Is the Evo IX pump enough to support a basic 20g setup?

Also, if I rewire the Evo IX Pump will I need an AFPR? Any input would be appreciated.

Lastly, does the Walbro 450 whine as bad as the 255?

Thanks

Any logging that we could look at? (would be very useful in helping you determine a cause for this) Off the top of my head, I am not sure if the IX pump can handle that airflow. What load numbers are you seeing around these spikes?

I took some logs last night, but I didn't log voltage so I'll post some better logs later today.

This is a 3rd gear WOT pull. I don't have time to trim it down and make it pretty right now, so I apologize. Some quick points: My highest load was around 288, my IDC was around 56, and my fuel trims are still wacky but I'm working on that.

Well I just went out and took some logs, but my wideband didn't get logged for some reason. I did log voltage though, and it never drops below 13.6v during WOT. I did only take it up to ~5,000rpm, so I'll get a more comprehensive log tomorrow.

I would say to rewired it. It's such an easy task to make sure your pump is flowing what it should be flowing. From what I have found the evo 9 pump should flow just a bit over what a wally 190 flows (from what I read from a thread on here) The evo 9 pump does fine with my 16g at 20psi which I know is apples to lemons.

Logging good battery voltage doesn't really tell you anything as far as the pump is concerned. The voltage/current flow at the pump is what matters. The only way you can see that is with a multimeter. I'll bet you probably have a decent voltage drop at the pump through the factory wiring. This is why people have been rewiring DSM fuel pumps for decades.

I'd rewire your pump, and see where that leaves you. Chances are, the rewire alone may correct your issue.

Start by reading here: http://www.roadraceengineering.com/fuelpumptechtip.htm

Then here: http://www.raktron.com/fuel/rewire1.html

Then here if you're bored: http://www.plymouthlaser.com/rewire.htm

GST with PSI said:

Logging good battery voltage doesn't really tell you anything as far as the pump is concerned. The voltage/current flow at the pump is what matters. The only way you can see that is with a multimeter. I'll bet you probably have a decent voltage drop at the pump through the factory wiring. This is why people have been rewiring DSM fuel pumps for decades.

I'd rewire your pump, and see where that leaves you. Chances are, the rewire alone may correct your issue.

Start by reading here: http://www.roadraceengineering.com/fuelpumptechtip.htm

Then here: http://www.raktron.com/fuel/rewire1.html

Then here if you're bored: http://www.plymouthlaser.com/rewire.htm

Click to expand...

Awesome, thanks for all the links! I'll read up on them.

I guess my thinking with logging voltage was to check alternator output. I thought that maybe if my alt. was going bad, the voltage might be dropping at higher rpms.

I'm going to rewire my pump no matter what, since it can't really hurt anything besides my wallet if it forces me to get an AFPR.

smills1840 said:

Awesome, thanks for all the links! I'll read up on them.

I guess my thinking with logging voltage was to check alternator output. I thought that maybe if my alt. was going bad, the voltage might be dropping at higher rpms.

I'm going to rewire my pump no matter what, since it can't really hurt anything besides my wallet if it forces me to get an AFPR.

Click to expand...

Np.

Alt voltage will drop as you get into the upper RPMs. That's normal, as long as the drop isn't drastic.

You'll eventually want to get an AFPR no matter what. The Evo pump is probably already overrunning your stock regulator.

I don't think there's any drastic voltage drop that I can see.

I'll try to get a rewire kit soon and I'll report back.

Also, did anyone have any input about how loud the walbro 450 is compared to the 255?