Spoke with Addicted yesterday and looks like they resolved the issue! These guys are on top of the game. Seriously, if anyone needs rotary work around the Tenn/Alabama/Georgia area, these are your guys!

They removed the return line off the regulator and let it dump into a bucket when the fuel began to act up. Doing so immediately resolved the issue! A larger return line was installed and it seems to be fixed. It appears that the difference in size between the feed and smaller return was causing high pressure / aeration into the tank which leads to the cavitation/heat cycle. I know some folks had mentioned this earlier, never thought this was possible as there was no issues with factory feed/return but learn something new every day! It makes sense now that if the feed flows considerably more than the return, the fuel is going to have high back pressure at the regulator/return

Fuel pressure is reportedly higher and now the primary pump is providing considerably more fuel. Hopefully it passes the endurance test and we get some numbers today!

If anyone is going to Import Alliance at Atlanta Motorspeedway, I'm hoping to be there this weekend lets meet up!

 

i think i win 100 internets everytime with that old chestnut "same size" argument for fuel return sizing on bypass reg setups
but alas i thinks i already banned the wingnut who used to argue me down on this point

it has been quite a journey this 20b conversion and you took on all the hurdles without spitting the dummy publicly , and proved a few truths ( the hard way ) along the way

congrats.. enjoy

 

Yes, you do infact win 100 internets!

20b "aka" Murphy's Law - Anything that can go wrong, will. And hopefully all possible mistakes have now been made

I admit I'm as hardheaded as they come. But hey, learning the hard way is learning the best way!

 

Awesome! Glad it's resolved. I think we were all frustrated. Lolz

 

Congrats man. Finally all issues seems to be fixed. Hoping for some nice numbers from Zach

 

Hey, I've been having similar problems with my fuel pressure. I added pulsation dampeners which helped a little, but that just treated the symptom not the actual cause. I was about to throw a new fuel pressure regulator at it. I had suspected that my return line may be sized too small, but the CJ assembly that holds my 2 044s comes with a -6an return. So I guess I need to pull the assembly and have a -8AN return tig welded into it?

It's also interesting that I get these fluctuations when running only 1 fuel pump

 

Quick post. Detailed to follow.

488rwhp @ 8psi
550@ 10psi
627hp / 458tq @ 16psi pump and meth
727hp / 575ftlbs @ 20psi pump/meth

Spinning so bad on dyno. First pass at 20psi 666hp. Two people in trunk, 727hp still spinning couldnt read accurate chart so decided it was enough :P

Waiting to resolve a blip in the map at injector staging but surely will be fixed

Will post vids and pics soon

Thank you to everyone who has participated in this build. This community is a great place. Without the inspirations and open support this would have never been possible.

 

Wow! That is super sweet. Reaping the rewards of your patience and hard work. Damn that is narly power.

 

Congrats! Enjoy your fright train! ;-)

 

congrats

my little tip for street mode is to pull 1 or 2 degrees from the timing trims so you dont run on the sharp edge
.. this will just ease in some safety margin for glitches in fuel quality , and changes in vehicle load
( passengers or hills ( or both ) and hot days and very cool ones )
and has relatively minor effect on the power curves

i then usually put that degree back into the idle maps so there is no decrease in idle quality

going back to the sharp tune ( for when fuel quality and engine load is assured ) requires only to re-zero the timing trim ( and pull that idle degree back, though not always necessary )

.. if the ecu has multiple saved maps , then you should copy this one entirely to another slot, and pull that degree from there . careful to select street or race tunes as required

 

Nice numbers. Look forward to the videos and the dyno sheets. Want to stare at them and dream of what can be for me

 

Great news, car is coming along awesomely

 

^ spin


Videos soon and hopefully some footage from IA.

I can't express it enough. This community, rx7club specifically, has been a source of information and motivation for the past 10 years. Feel like this car was built by everyone. Influenced by the 20b's that came before. Thank you.

Lets see if we can wrap this up and get this thing on the road!

 

NICE #s, CONGRATS!

 

Looks like you are running way too rich from 3200-4200, then way too lean from 5000-5700 at low boost. High boost is not showing the AFRs, but that big dip at 5700 is a cause for concern if it correlates to the same lean area at low boost.

Is this a load bearing Dynojet?

Spinning the tires on the dyno, means you will never get to redline on the street, start saving for wider wheels and rear flares. Welcome to my world.

 

Thx for sharing this info because now I know what my problem was when I was running my surge tank. My external Bosch 044 would always hum after a few minutes and gave me hard hot starting issues. My surge tank has the stock pump feeding it with stock sized lines with also having stock lines on the return side from the surge tank. The 044 feeds through the stock lines to the primary rail. The return from my pressure regulator is also the stock line back to the surge tank. I know now that my problem is the stock return line from the surge tank to the main fuel tank as it's too small to return the excessive fuel from both pumps from the surge tank. The hard hot start and humming issue is the reason I removed that surge tack a few months ago. Now I have a reason to retry the setup.

 

YES!!!! Awesome. Hope you can fix it.

 

Yes, Rays old dynojet. I haven't driven yet but they street tuned it at 16psi pump/meth said it hooked very well in 3rd 4th. The tires are so sticky they actually stuck to the dyno when the car cooled down.

Dont plan to run more than 12-16psi anyhow it seems like it will be more than enough

Im going to go over chart with tuner. Youre right, that 12.0afr range area seems sketchy.

 

Decided to pull injectors and send off for cleaning, replace filter and pre filter just to be safe. After going to larger return and not having had a sock, want to be safe before boosting. Should have some videos in mean time soon.

 

Where are the videos dude

 

First Run

 

^^^That's incomplete Where's the pan shot over to the dyno graph??

 

 

EDIT:

We are working to resolve a hiccup occuring on/off throttle and at pri/sec transition.

The car will run!

 

I am aware of this, and asked Zach multiple times to send me the ecu file and logs. Until yesterday I have only recieved a log. I have had a running joke around here for 10 plus years that "it must be the ecu". I find people who cant figure out the problems always point towards something they do not understand. Being turbo has nothing to do with how the ecu operates. Injector staging works fine on the other 20B.