hmm

Whats weird though is Walbro USED to ahev a high failure rate. We once sold them, then stopped becuase of it. We switched to the Denso unit from a Supra TT, never had any issues, though it was a bit more involved to install (not hard though). This was for many cars we worked on, from Evo's to Subaru's to DSm's, over the years. The we started hearing good things about Walbro about 2 years agao again..that they had fixed the previous failures, etc. We took a chance and in the last 2 years ahev sold damn near 1000 fuel pumps, and used many in our own shop cars, and have not had one come back.

They are noisier than the Denso's though.

 

Well Adam,

This is the exact reason why I don't like to speculate on parts I haven't used and stayed quiet.

Also due to PM overload I am posting a pic enlarged and zoomed in on my SARD pump so some certain people can look at it.

test link to pic still having upload problems


http://tinyurl.com/32lbb

 

We have seen them crack on RB26DETT engines (in fact we have a real live example at our shop). What happened to the one we have at the shop was that the ceramic insulators in the plug fragmented off and fell into the combustion chamber, thus causing damage to the pistons and quench pads on the cylinder head of where the piston shoved the ceramic bits in the head.
Maybe the Denso plugs do not like any kind of detonation. I've personally had some experience with them on a Turbocharged 2.3L 4-Cyl putting down close to 700 wheel HP (drag car setup), but then again, that engine was running methanol race fuel, which does not allow any kind of detonation whatsoever.

I put them on a Honda motor recently that was running close to 11.5:1 compression, and so far, no bad news yet. Hard to say...several possibilities of what could make it happen, however, it's interesting to me that I see others having the same problems with the Denso plugs. The Denso irridiums we have are SARD units.

 

I know this thread is long, so I figured I'll start replying post by post as I see fit. =)

First off....thank you Max for the kudos. Your support is greatly appreciated. The "wiring" is present because this pump, as with any fuel pump, relies heavily on it getting at least 13.5 volts for it to perform the way it needs to. The pump Max got will support up to about 500cc worth of injectors on a 6-cyl engine. With more voltage, it can support up to about 800cc or so...but that's with more voltage. To give you an idea of what I'm talking about, this pump at 16V will pump close to 340L/Hr.

...but you know, Max, the one thing that I honestly wasn't thinking about was the "returnless fuel system". Hmmmm..... I can't count how many times that dilemma has screwed my line of thoughts and reasoning up. Your returnless fuel system -might-not like that wiring setup............

But anways, back to the topic... So, with 380cc injectors the SARD 280L pump is easily capable of flowing up to 70psi of line pressure, so that means that it'll support up to 30 psi of boost provided that you have a base idle pressure of 40psi. With all said and done, only one other in tank fuel pump outflows the one that I suggested for Max to use, and that would be the Nismo pump we use in our GTR's. However, I thought that the Nismo pump will be too much pump and will also cost more than what he needed.

...k, back to reading! =)

 

Agreed.

 

according to the Nissan service manual, you should see EXACTLY 51psi @idle...

 

Kinsler Fuel Injection (www.kinsler.com) is where my source got the Denso pump info that I used earlier.... Maybe with enough speculation (or maybe they already did it...) they will flow it....and flow it at different voltages. =)

 

I've had two cases of breaking also. Not the ceramic portion but the actual metal tip is very fragile and have had it break on both a high compression NA motor and a boosted motor. Neither car mas making more than 400 HP so very mild cars. I just use Blitz/NGK Platinum now as they always work, come pregapped and have never had a failure yet (knock on wood).

 

thats weird......I cannot even count how many times I ahve used Denso Iridiums, and not once had a problem (have used HKS plugs too..same thing, at the customers request, and also have not had a problem). But thats the thing..everyone's experiences vary.

 

A definately possible cause of electrode and/or ceramic damage
could occur pre- plug installation. Due to the very hard electrode and thin ceramic (by design to improve spark energy to the chamber), these plugs can really easily be "stress fractured" during installation.

I have used them on a blown 4.7L B8 and not had any issues, but then again I really , really was careful to inspect and baby them durin installation.and I inspect them at each oil change. For example if, the Gap needs adjustment you need to follow the Denso recommended guidelines very closely.

I am still debating if I will use them when I FI my G35.

 

Undue care during installation could cause premature plug failure, but still....after reading these posts, it almost seems like Denso Irridium plugs cause too much of a liability risk. Eeeks...they gotta be good for something.... =) Maybe I can sell these SARD plugs to methanol burning drag cars.

 

Well thanks Victor!

I said they cracked but hey who am I. That is why it sort of gets old just speculating.

I have heard *several* stories of them cracking but hehe nobody listens to me. So from now on I will leave the answers to the experts and do what I do best, drive!

My track is OPEN! First run for me is Feb 4th!

Thanks for the pump, injectors and all of the support. I reccomend your Company to anyone needing go fast goodies!

You Da Man in m ybook, if it wasn't for you my setup wouldn't be right so the props works both ways!

Peas!

 

Same here Max. Thanks for being such a great customer!

 

well from reading this i called rb and im waiting to see which pumjp im going to use....i really respect rb for not selling me a defective product (walboro pump) but im hoping for a pump soon because i really want to go ointo the 8+psi

 

My stock pump today flowed very well Hehe, *BEG*

That was post flash to 380cc's, more than 51 at idle for sure. Where are these numbers coming from like 290cc and 210L? Is there a link to graphs on that? I was quoting someone else on the numbers. Chebost flowed the stock injectors, where did the 210L number originate at? I'm curiuos?? Anyone?

I have spoken to Victor today, we are gonna meet in person next week about this and have some fun. He is 30 minutes from TS! Road Trip!

A booster is also an option. I think out stock fuel pump is more than 210L or I got lucky that is why I want Victor to check out my setup in person (plus he has cool cars in his shop, Skylines, EVO's etc all SEMA show quality.)

When you call Victor ask about his injectors, stock is four very tiny holes (as in you can't see them.)

Try and count them (these are stock)

http://home.surewest.net/mailmax/injectorbest640.jpg