Ask and you shall receive





Top is the standard EvoX tank, bottom is the RS version. The RS version has a dip which acts like a collector right where the pickup goes. The CT series Evos also had these dips but for some stupid reason, they took it off for the standard EvoX

 

my car did the same thing on the dyno the other day when checking my tune since i put the stock turbo back on until i get my peakboost kit....

i dont trust the relays... i really dont trust any of the stock power management for the fuel system... was thinking about divorcing it from the ecu completely...

what do you guys think?

i.e. use the stock fuel pump relay as a 12v switched or some other source to turn on my new relay which will go to a kenne bell boost a pump, which will then go to the fuel pump....
have it this way on my rsx and it works flawlessly.... currently 1000cc, walbro 255, -6an feed, stock return, 1:1 regulator, on c16 this supports over 700 crank hp...

 

I know of a place that sells the blue relay for $11.99 shipped. Only took a couple of days to come in the mail!

 

your problem is not the relay on the dyno. It is the lack of g force pulling fuel over to the pump side of the tank as the siphon sucks and is too small to do it on it's own. We I'll post up a thread soon on this subject.

 

The track Evo 10's found that flaw almost two years ago now... I thought this was common knowledge at this point but I guess not. There where a couple threads about it. I believe AMS and Ryan Gates have posted about it before.

A bunch of the track guys we have tuned have experienced it as well. It's amazing what happens when you drive the cars on more then just the dyno at real tracks.

- Bryan

 

Thank you all for pix and confirmation that a pick up problem does in fact exist. Am I correct in assuming that hard straight line acceleration (as opposed to the side forces experienced in circuit racing) with < 1/4 tank fuel may have caused my lean run condition at the top of 3rd and 4th gear? If so, and I think this is what happened, what can I do to minimize this? Baffles? Foam filler (if such a thing exist)? Fuel cell? Still looking for a source on the elusive "RS" tank you folks keep referencing. I do plan to track the car in the future so side forces are a concern but just on track (fun) days so it should be easy to keep it at > 1/2 tank while on the track but this is a new problem for me. Never had this problem with the stock tank on my Monster Miata and it pulls over 1g on the skid pad runs the 1/4 in low 11's.

Thanx for the help,

Paul

 

Common knowledge to most folks here...probably; Me? this is my first Evo bought in January and I have only been modifying and on the Evo boards for 1 1/2 months so cut me some slack . I've tried a couple times to find the aforementioned threads but "fuel pickup" and "gas tank" have not come up with a relevant thread using search

 

A track racing Evo has nothing to do with a stationary fuel pickup issue on the dyno where the car is not moving.

We will post a new thread on our findings this week. I think the forum will be shown that many less fuel pump relays were "saved in the nick of time" on the dyno, if they were ever bad at all in the first place as it was an entirely misdiagnosed issue.

 

Did you really just say failed relays where all in peoples minds or did you type that improperly in haste?

I look forward to another SYA thread from you..

- Bryan

 

It appears you have a reading comprehension issue. Everything stated is contained in the quote in your own post. We have referred to on dyno testing.

 

Neither this thread which I started nor the thread drift that I also initiated have anything to do with stationary fuel pickup issues on the dyno. If you have an issue with GST please take it somewhere else.

 

what stationary fuel pickup issue...

 

We are all supposed to wait in suspense until they post it.

 

I experienced the same issue on my car and i thought it was the plugs. After changing the plugs i went for a tune and the car had a little under half a tank of 100. after some pulls the car did the exact same thing.

 

On the dyno or the street?