Radium Engineering Fuel Pulse Damper

[GST with PSI]

What's the feeling on the Radium pulse damper? Anyone have any experience where it made significant improvements?

Looking for any feedback, good or bad. If you have a before and after log where it helped/didn't help, that would be super legit

Fuel Pulse Damper, Direct Mount Kits

The Radium Fuel Pulse Damper Kit helps regulate and maintain safe and consistent fuel pressures. Erratic fuel pressure is commonly associated with random lean air fuel ratio spikes that are difficult to tune out.

www.radiumauto.com

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[FIBA M - EC17PSE]

from what i know from talking to a few race teams is they do work but not needed till you have crazy fuel pump setups or pushing some huge power to help it.

 

[gofer]

Joining the discussion a year late but wanted to comment.

One or two cars I've tuned in the last few years it's been impossible to get the WB AFR's to marry with AFREst because of fluctuating AFR's. I don't tune nearly as many cars as Kevin, just mine and the local crowd usually but have been seeing it a lot lately... I found this read on KJ's site awhile ago and had a buddy try adding volume to his fuel system going to 8AN feed, 8AN filter, and 8AN to the AFPR and it corrected the issue completely.

I recently ordered a Radium rail and a fuel pulse damper for my 2g. Not because I had this issue, just want to compare what it looks like with/without the damper installed and logging fuel pressure and see if there is a cleaner signal.

This is from Jewers Six Sigma Tuning page regarding the issue, for the for article here's a link. https://www.sixsigmatuning.com/fuel-system-troubleshooting

"For ~10 years now I've been dealing with this unusual wave in AFR that doesn't make sense to tune out (if you do you end up with a bizarre wave in VE or MAFcomp). I'll give an example of these situations below. It used to be very rare, but has become an epidemic lately. The cause is likely some kind of dynamic/pulsing issue caused by the larger injectors, and the fix is more fuel system volume. That's not more volumetric flow, just more volume in the fuel system. Larger rail, larger lines, larger filter, etc, anything that increases fuel system volume. Here's what I've found so far, with the help of some really awesome remote tune customers that were willing to swap out parts and spend some cash to collectively solve this decade old mystery.

• No single part is a fix for this (including dedicated pulse dampers like Radium (more testing is being done on these)), but the combination of a few parts that increase system volume. Every individual part was tested by itself and none were an obvious fix on their own.
• The issue is definitely tied to larger than stock injectors, but not any specific size or brand. Everything from 650 to 2150s has caused this problem. Going back to stock injectors fixes it, but of course, that is not a real solution. Just proves that it is injector driven.
• We've found that teeing in a dead ended hose about 5 feet long at the rail does provide a lot of damping and mostly solves this issue. But that's a pretty untidy solution and most people aren't going to want to do that. It just illustrates the point that more system volume is the answer. This acts like a water hammer arrestor in home plumbing systems and provides pulse damping.
• Upgrading to a -8 feed line, and ideally the filter and rail as well, has been shown to be totally effective, and you get the added benefit of increase flow from those bigger pumps at the same time. A -6 feed line is not a complete fix, it's better than the stock feed line but not as good as the -8 line. I've always felt a -6 line is fine for 450/525 pumps, but for this reason alone I now recommend -8.
• Commercially available Fuel Pulse Dampers did not help on two different cars.

This example is of a set of 1650s on stock rail and stock lines with a 450 pump. It was much worse on 2150s, off by 40% at the peak of the wave.

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I sent out a ~5 foot length of -6 line to tee in next to the fuel rail as a test (other end capped off, just to add fuel system volume). This was the result of that change. Most of the AFR wave was eliminated and VE dialed in normally. It was approximately a 10% change at the peak.

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This car is on 2150s, 450 pump, stock rail and lines. The AFR wave is obvious in the green trace. Less obvious is that it also seems to affect idle on this car.

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[Dashnizzle]

Joining the discussion a year late but wanted to comment.

One or two cars I've tuned in the last few years it's been impossible to get the WB AFR's to marry with AFREst because of fluctuating AFR's. I don't tune nearly as many cars as Kevin, just mine and the local crowd usually but have been seeing it a lot lately... I found this read on KJ's site awhile ago and had a buddy try adding volume to his fuel system going to 8AN feed, 8AN filter, and 8AN to the AFPR and it corrected the issue completely.

I recently ordered a Radium rail and a fuel pulse damper for my 2g. Not because I had this issue, just want to compare what it looks like with/without the damper installed and logging fuel pressure and see if there is a cleaner signal.

This is from Jewers Six Sigma Tuning page regarding the issue, for the for article here's a link. https://www.sixsigmatuning.com/fuel-system-troubleshooting

Wanted to bring this back up because I am also running into a fuel pressure issue with my 1440 high-z injectors. Can’t quite get the AFR’s to match at all. Kevin is also my tuner and he recommended stepping up my fuel lines as well. He even said skip -8 and go right to -10 even though it’s overkill because he had some cars step up to -8 and still continue to have this issue but none with -10 have the problem.

I was looking into this damper as well and was curious if it worked out for you?

EDIT: kevin mentioned 3 people have tried it and nothing changed or fixed the problem on those cars.

 

[Focality]

Hello, posting a comment 3 years late but I think I might be experiencing the same issue.

I’ve already cleaned the fuel tank, replaced all fuel lines and hoses, installed a brand-new Fuelab 450 fuel pump with an external relay kit, a brand-new Tomei fuel pressure regulator, brand-new ID1050x injectors, and even upgraded to a 220A high-output alternator — yet I still have fuel pressure problems.
The issue is that every time I start the car, the fuel pressure is different. I set base pressure to 43.5 psi with the vacuum line disconnected, but once the engine is running the pressure slowly drops to around 30–35 psi, or sometimes rises to 50–60 psi.

At this point I’m pretty stumped because I’ve replaced or upgraded everything related to the fuel system.
Has anyone experienced this before?

 

[Car Cannibal]

You are NOT experiencing the same thing, the thread is talking about WOT fluctuations. Consider starting a new thread, regulator and return line most likely.

 

[Focality]

You are NOT experiencing the same thing, the thread is talking about WOT fluctuations. Consider starting a new thread, regulator and return line most likely.

Already replaced regulator and checked return but will make a new thread. Thank you