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Makes sense that does

HX35\'s are pretty good and can be had for about £450 NEW

However StavFC,

I just fitted one to a 2JZ in a chaser with a friend and it had a T4 Flange not a T3 like you said ?? Possibly a different exhaust housing to the ones you have ?

As for the whole missfire thing above .5 bar on a 20g housing.... Like has been said it re ingests the exhaust gasses duee to not being able to fire them out fast enough.

Due to the fact Rotarys run seriously rich compared to a piston engine this means it does still actually ingest some unburnt fuel and all the crap of the day  along with fresh fuel which completely screws up the mixture, therefore causing your misfire and bag of sh**e running conditions.

Its the same with my last FD, I had it all set up for 1 bar on the twins with good exhaust etc and it ran perfectly.

I fitted an exhaust bung for noise reasons in my neighbourhood due to complaints and the car wouldnt boost above 0.6 bar It would judder and misfire and splutter and jerk and pop and bang etc etc along with completely fouling the plugs too.

this was due to the increase in back pressure (read restriction like a smaller exh housing on a turbo) which was "choking" the engine.

So in short the reason it misfires is down to the poor mixture caused by the choking caused by teh exhaust housing being too small on the turbo. However thats kinda what Blitzy has already said and it does answer your question fully so Im unsure why you keep asking someone to explain it further ?

Unless of course you like typing and causing trouble like a :Typing warrior LOL :Thumbsup!

Hi Steve

Please email lisa@mazdarotaryclub.com with your address details and I will post up 2 stand passes.

Camping is for the Saturday night only.  Sorry - this is the rule for all Santa Pod events not just Rotorstock.  You could try camping at Billing Aquadome which is a holiday park and is the next junction down from Santa Pod, alternatively someone on here who may know of somewhere to camp - try asking Jono

Email sent Lisa !

Cheers !

as for the camping I found a site happy to cater for car folk just 4 miles from the pod, far nearer than billing !

Its called Tree Tops, just google it if anyone is interested, only a tenner for the fri night BARGAIN !!! :Talking1

Hi Lisa,

There are a few of us coming down form scotland, were bringing 2 FD\'s but unsure of how many people at the moment hence we were going to just get tickets on the day ?

Is that ok ? We would still like a stand pass for the 2 cars though so can you let me know what we need to do ?

Also I called the POD to ask about camping on the friday night and they said there wont be any, is this the case for sure as some folk have since said normally you can camp on the friday night ?

Thanks in advance !

email sent !!

cheers folks, living in scotland really does suck at times

Cheers Carl,

Do mazda dealerships have one ? Just i only have a normal compression tester and there is nowhere up here in scotland that I know of that has one

It certainly seems like you have a small chip on the end of a tip.
I would not drive it anymore untill you get it properly compression tested.
Regards
Carl

balls..................... LOL

Oh well, looks like its going off the road for a bit. Too skint to fix her till I get paid again so guess i better find a runabout, certainly dont want to be driving about on my motorbike for the rest of the month in this weather!

Thanks for the info Carl, will a proper compression test show a chipped tip up ?

Also if you do chip a tip am I likely to require a rotor housing as well as new tips ?

Well today I had a better look at the car, nothing visibly wrong however now that ive had a chance to check for codes etc from the ecu I know its not a sensor.

Also im running non sequential so was able to check out the vac piping easily and cant find any problems there either.

After checking over everything I took it for a spin. From cold it started up fairly easily and done the usual cold fast idle then dropped to about 1500rpm for a bit before finally reducing down to the more "normal" idle speed of about 8-900rpm.

as stated before it idles good above 1000rpm but below than and you can hear that its certainly not running on both rotors fully.

Went for a drive and again drives fairly good above 1000-1200rpm but below that and its certainly misfiring. Also any time you change gear it pops as if its overfuelling too.

When you rev it right up and come on boost it pulls strongly, again popping on gear changes and overfuelling but when you then lift off there are puffs of blue smoke. It only does this after being on boost though.

Once fully hot it still idles really badly and the boost gauge does flutter a bit too. Also when accelerating lightly the gauge flutters a fair bit.

If you turn it off and start it again when hot it starts up no problem.

Now im thinking the worst here but still the fact it starts ok both hot and cold and does drive on boost doesnt tie up with what others have said when they have dropped a tip ?

Also again the chuff test sounds even enough on both rotors to me too.

Im thinking its probably not a good idea to drive it anymore untill I get to the bottom of this incase it causes more damage ?

Any thoughts on it folks ? I really dont want to go pulling the engine to bits unless i really have to. Is there any more checks I can do at all to confirm if its deffo a tip ?

Nah she doesnt sound like that Ash

Thanks for the replys, I got my compression tester back this morning so Ill get it checked out tomorrow, as doing the family thing today lol!

Fingers crossed it turns out to be something silly though!

It runs excellently on boost though and certainly doesnt have any problems with being driven hard !

Nah you cant gap the plugs on these bud due to the style of them, there weird looking and not adjustable. I know that sounds odd but when you remove one you will see what I mean

Im thinking it could be plugs as they do look a bit worse for wear but I really dont want to spend £40 on plugs to discover it still wont run right LOL!

OK mine starts the same both cold and hot, chuff test sounded even across both rotors with 3 close together chuffs on each rotor done seperatly over and over

So am i right in saying that if it had a cracked tip it would be fairly noticeable when you do the chuff test ??

If thats the case then what the heck is wrong with my baby!!!!!!!! LOL

Ite like its misfiring on idle but is perfect above 1200 rpm. Im so confused! LOL could it be plugs ?

I thought usually with plugs that are duff you get a misfire under load not at idle ?

ok heres some more questions then.

If it does still start albeit slightly lumpier than normal, does idle, and drives faultlessly above 1200rpm is it still likely it could be a cracked tip ?

When you do the chuff test would you notice anything or would it only show on a proper compression test ?

As above folks, Ive not managed to find anything usefull searching so far so ...

what are the normal symptoms of rotor tip failure ??