Right guys i think my Cat has seen better days (partially blocked) and i was looking at buying a de-cat but just wanted to know if i have to re-map her (involves me fitting some form of piggy back or ECU) or not to worry. I know these are delicate engines and the last thing i wanna do is blow her up, but i spoke to my master tech at work today who has dabbled with the rotaries and is currently building a circuit racer (series 2) with his brother who builds and tunes the rotatry lumps and both have said i should bother getting a re-map or any any kind of map as My 7 will be fine. What do you guys think? Any one running a de-cat with no form of fuel control?
Thanks in advance
Cooch
Apologies for the double post my PC has lost the plot.
This cannot be easily done with the stock ecu, so most fd owners buy the power fc. If your running stock twins, the power fc will control the boost fine. On an NA rotary you could prob get away with it, but on a turbo rotary, your gonna overboost with no cat meaning possible detonation. You need some sort of boost control and extra fueling, the power fc does both of these.
99% sure a de-cat without proper fuelling adjustment is a No-No mate.
Sure you can give it a go but from what ive read it is a very common cause of rotary engine failure.
Ah right so cos the Turbos have nothing to push against there gona overspool. Got ya. I have a fuel controller but its all in Japanese! Lol. Might start the hunt for a power FC then. Thanks Robbie. Anyone else have any comments on the situation. Please forgive me im a Rotary newbie so im trying to gain as much info as possible.
Quote from: neil_jdmr99% sure a de-cat without proper fuelling adjustment is a No-No mate.
Sure you can give it a go but from what ive read it is a very common cause of rotary engine failure.
Thats something i definalty dont want!
Quote from: CoochAh right so cos the Turbos have nothing to push against there gona overspool.
Exactly, and overspooling means more air forced into engine. More air and not enough fuel going in to engine = detonation.
Yeah which is wrong mixture which these lumps hate! I like flames but im not so keen on Det.
It will give a nice performance increase too. Just a decat, backbox and tuned power fc will give roughly 60-100bhp more depending on who maps the power fc.
it differs from car to car, but generally speaking if you get a good filter and dump the cat/bigger back box, you will suffer from boost spike whereby the gasses flow faster than the control loop on the stock ecu can catch it and dump excess pressure (via wastegate).
And as we know more boost needs more fuel, or in the case of the stock ecu, you will get \'Fuel Cut\', this feels like youve hit a brick wall, no power for a second then it goes back to normal.
Open your wallet get an Apexi PFC, have a map, and happy driving with more power, less fuel etc.....
Rmaj
Agreed, Power FC and Map mate for sure. Not only will you give your self more power with a smoother drive you\'ll extend the life of your engine (and your car will be setup for our lesser fuel)
I know what fuel cut is as my old car had that! Lol. Thanks though Rmaj this a whole new ball game for me. Glad shes a weekend toy soon so i can get a few bits for her, first are gona be a de-cat and apexi! He he
Awesome thanks Mark. Where\'s the best place to find Apexi PFC\'s? Ebay?
I got my PFC from Nengun - took over 2 months to arrive, but it was so cheap it was more than worth it!!
Quote from: SiHI got my PFC from Nengun - took over 2 months to arrive, but it was so cheap it was more than worth it!!
same here took 6 weeks but no vat :Thumbsup!
414-AZ004 Mazda - RX7 - Series 1-3 91/12-95/11
So, £430\'s a good price on these.....what sort of money to fit, map etc on top of the unit price??
Cheers Phil....
Quote from: CoochI know what fuel cut is as my old car had that! Lol. Thanks though Rmaj this a whole new ball game for me. Glad shes a weekend toy soon so i can get a few bits for her, first are gona be a de-cat and apexi! He he
Awesome thanks Mark. Where\'s the best place to find Apexi PFC\'s? Ebay?
RHDjapan.com - I found it as cheap as Nengun but much faster delivery. PFC took less than 2 weeks even though it was not in stock when ordered
Really? How much was it Colly? Got some bits to order from RHD anyway.
i just ordered from nengun. The back orders have cleared now i believe. Never seen a pfc on rhdjapan for an fd.
How much was it Timmy?
here are the two sites in question
http://www.nengun.com/
https://www.rhdjapan.com/
I bought mine from nengun ages ago and was cheaper then other places i could find at the time and deliver was quite quick. Must depend on stock and demand at the time you order.
Cheers wells. Looked on Nengun earlier and found some other goodies i could order too he he. Cheers for all your help lads.
wot you gonna order??? spill the bans :)
Well just some little goodies nothingg big. Bride seat material to recover my Bride Bucket seat, a new subframe for said seat, Takata Harness and maybe a few other goodies. So many to choose from!
Quote from: CoochWell just some little goodies nothingg big. Bride seat material to recover my Bride Bucket seat, a new subframe for said seat, Takata Harness and maybe a few other goodies. So many to choose from!
do u need a silenced de-cat??
i have one that i bought off martin at speedline imports that i dint use
nick
Hey Cooch,
I have a un-silenced de-cat bought from Re-worx and never used if you\'re interested? I live in Southend-on-Sea, so not too far away. I would PM you but I can\'t figure out how to do it:xconfused
Dame
Dame you have to be a Full member to pm.
That be why then!
Quote from: rmagictasticit differs from car to car, but generally speaking if you get a good filter and dump the cat/bigger back box, you will suffer from boost spike whereby the gasses flow faster than the control loop on the stock ecu can catch it and dump excess pressure (via wastegate).
And as we know more boost needs more fuel, or in the case of the stock ecu, you will get \'Fuel Cut\', this feels like youve hit a brick wall, no power for a second then it goes back to normal.
Open your wallet get an Apexi PFC, have a map, and happy driving with more power, less fuel etc.....
Rmaj
boost spike?? or just increased boost? :confused::eek I\'m going to decat, better filter, new smic & remap my car, but I had thought that it would be ok to not fit a boost controller - or is this in fact necessary?
You can use the apexi to control the boost on stock twins so no need for an aftermarket boost controller.
Might be interested Dame. What de-cat is it? Anys pics? How much are you looking for it?
Cooch,
I bought it from re:Worx In January. It\'s a unsilenced pipe, no brand name follow this link, it\'s the second one down:
http://www.reworx.com/products_exhaust_midpipes.htm (http://www.reworx.com/products_exhaust_midpipes.htm)
We can take this offline: damehyndman@yahoo.co.uk
thanks
Just added you dude. japracer@hotmail.co.uk