Looking at an FC Cab this week!! Advice?

[uncle silvia]

Cheers ill look into this

my email addy = crxboy150@hotmail.com

And what is yor real name too haha :Giggle

[Prof]

Email sent - real name Dave. :cool

[dthebuk]

this may be completely wrong BUT, i was under the impression that these boost chips (when mapped for an exhaust an air filter too) will run the car slightly richer to deal with the exhaust/air filter, im assuming the engine is using more air. Also when the car is running higher boost levels the map compensates by adding more fuel for the given level of boost. So Surely if the car is set up right  it shouldn\'t be running rich, but it should be using more fuel. That makes sense right? So if thats right the problem isn\'t down to the car running rich. point proved

[Prof]

When you hit the throttle hard, the ECU will deliberately overfuel to allow a rapid throttle response, but the fuel is pulled pretty quickly - the result when you kick down is that you will get a puff of black smoke as there is a momentary rich condition.
 
Uncle Silvia mentioned that the owner had said the smoke was blue/black - I was merely suggesting that the black smoke on pressing the throttle may simply have been down to this temporary rich condition - and therefore perhaps nothing to worry about.

[uncle silvia]

Well I looked at the car today and Ive spoken to Prof on the phone (thanks mate!!!).

The car itself is very tidy but the only things I can see wrong with it are the roof and this smoking problem!

Ive gone through several checks with Profs advice and the engine itself seems fine.
It idles correctly,
Starts spot on hot and cold,
The compression test showed over 100psi in both chambers and all three blips as far as i could tell were about equal,
The bottom plugs were dry and not oily at all,
There was no oil in the intake/return pipes!

With this, at worst, im guessing it could be a seal in the turbo blowing oil into the exhaust and at best it could just be a bit of oil in the turbo/exhaust that has leaked through over the period its been stood up! It doesnt look like the oil leak is from an engine seal!

Ive looked through the reciepts and 29K ago the engine had a complete overhall or replacement at a Mazda dealer with listings for all the seals and gaskets plus a "special costing" of £1600 which could be a replacement engine barrel! Total cost over £2000!

I very much doubt that with this and the comprehensive service history that the engine itself has any issues??

Also the car is currently running the lowest boost setting as he fitted the boost controller and just set it to low to get the car running. As he hasnt used the car since fitting it its never been set up on a higher boost setting , but still has the uprated chip fitted, this MAY cause it to overfuel due to the boost being low and the fueling being high??

Does anyone have any thoughts?

I think i may be going back up in the next week if all is well! :yes

[grinder]

sounds OK to be honest - if the engine has only done 29K - should be good for another 30K then - which for me is about 30 yrs !! LOL

[Prof]

Well I looked at the car today and Ive spoken to Prof on the phone (thanks mate!!!).
 
The car itself is very tidy but the only things I can see wrong with it are the roof and this smoking problem!
 
Ive gone through several checks with Profs advice and the engine itself seems fine.
It idles correctly,
Starts spot on hot and cold,
The compression test showed over 100psi in both chambers and all three blips as far as i could tell were about equal,
The bottom plugs were dry and not oily at all,
There was no oil in the intake/return pipes!
 
With this, at worst, im guessing it could be a seal in the turbo blowing oil into the exhaust and at best it could just be a bit of oil in the turbo/exhaust that has leaked through over the period its been stood up! It doesnt look like the oil leak is from an engine seal!
 
Ive looked through the reciepts and 29K ago the engine had a complete overhall or replacement at a Mazda dealer with listings for all the seals and gaskets plus a "special costing" of £1600 which could be a replacement engine barrel! Total cost over £2000!
 
I very much doubt that with this and the comprehensive service history that the engine itself has any issues??
 
Also the car is currently running the lowest boost setting as he fitted the boost controller and just set it to low to get the car running. As he hasnt used the car since fitting it its never been set up on a higher boost setting , but still has the uprated chip fitted, this MAY cause it to overfuel due to the boost being low and the fueling being high??
 
Does anyone have any thoughts?
 
I think i may be going back up in the next week if all is well! :yes

The chip won\'t make it run rich if your boost setting is low - basically the fuel mapping the chip provides is only going to get used if the boost actually hits these higher figures.  The mapping in the chip is most likely going to have similar settings to a stock ECU at lower boost pressures.
 
Things that might make it run rich:
 
Higher fuel pressure - the pressure regulator should see to the idle pressure - but some aftermarket pumps will flow much better than the stock pump, so it\'s possible fuel pressure has increased if the regulator is weak, and consequently the injectors see and inject more fuel - however the idle would be off, and the car would pop and bang a lot.
 
Poor Air Filter or Restriction in air inlet - again richer mix could result from reduced air flow - but as above - the idle would be lumpy and you\'d be banging flames out the back.  As he\'s got a new panel filter in there - this isn\'t likely.
 
Air leak between Airflow Meter and Manifold - if air is escaping or entering then this could affect rich / lean - but it would be leaner on lower boost and run richer as boost increases - specifically if the leak is after the turbo for this latter condition.  Careful spraying of butane / propane gas around the hose joints - or if you\'re careful a quick blast with carb cleaner - engine note will change if there is a leak.

[uncle silvia]

Right good news!

Ive just had a message from the owner and he has swapped the uprated chip back to the standard chip and its stopped smoking! :yes

He contacted the guy that sold him the chip and he was told that it was made from a base map from a race car setup in Japan, therefore adding more fuel to cope with higher boost and uping the oil injector rate to protect the rotors at hi boost! Obviously on a low boost setting in a road car there is too much oil being pumped in so it just burns off and comes out the back!!

Problem solved!

Ive just got to look into a few other bits and I may be getting this!

Ill keep you posted :mmmm

[uncle silvia]

Anymore thought on the above???

[grinder]

i think what you need to do with this car is actually prove whats on it

if all the injectors are stock and the exhaust etc.. - just stick a stock ECU back on it

just to add - 100psi on all the faces - crickey thats impressive - im sure you only get about 108 psi ( ish ) with a new engine ( dont quote me on that though )

[uncle silvia]

i think what you need to do with this car is actually prove whats on it

if all the injectors are stock and the exhaust etc.. - just stick a stock ECU back on it

just to add - 100psi on all the faces - crickey thats impressive - im sure you only get about 108 psi ( ish ) with a new engine ( dont quote me on that though )

The car has a full twin exit stainless exhaust from the turbo back with no Cat and a K&N panel filter in the the standard air box! It also has a HKS Boost controller set to lowest level! Other than that everything else is stock now the ECU chip had been changed back to O/E

[grinder]

ahhhhh - the only prob you should have no is that you will hit boost but at 8psi - this stops everything going bang - as the exhaust will allow the turbo to spool better

so now you either need a FCD to stop this - or an ecu that isnt tuned TOO much

there is a chap on ebay who sells the chips for about £15 - by right this should be OK for you - as its tuned for stock turbo , fueling , injectors etc..

and he supplies it on a chip - so you should beable to get the tuned ECU - open it - remove the chip and stick this on in - easy eh !! LOL

[uncle silvia]

Im guessing you mean "boost cut at 8psi" lol

Do u have a link for the guy on the bay as i want to get the right chip for the car and do it properly?

The ECU has already been fitted with a chip cradle so swapping the chip should be well easy!

[uncle silvia]

I think Ive found it??

http://cgi.ebay.co.uk/Mazda-RX-7-FC3S-1989-91-Turbo-Stage-1-Performance-Chip_W0QQitemZ280318914876QQcmdZViewItemQQptZUK_CarsParts_Vehicles_CarParts_SM?hash=item280318914876&_trksid=p3286.c0.m14&_trkparms=72%3A1683|66%3A2|65%3A12|39%3A1|240%3A1318


Is this the one you mean??

[pdtaylor18]

I know this chap and his chips do work, got one spare at the moment, got it while it was cheaper. he basically copied the data from a chipped one and simply copied them himself.
Same chap Stu that sold you the brake disks.
Think I have an HKS FCD as well, will not be needing that now i will be going E-manage.