Thats short, because of probably running lean and or boost creep?
But I have read a lot of mails and talking to other people running a midpipe without having changed the ecu.
But if I need one, should I go for the apexi ecu or a haltech?
Hi Skim,
Other people may do it and have no issue but it\'s not advisable because you will run leaner than car was designed to so it\'s better safe than sorry. As for which ecu that really depends on whether there is a good tuner where you are. If you have atuner that is capable with both haltech and apexi then I am sure most would agree the haltech would be better, but with the apexi you can mess around with stuff yourself with doing any damage. I personally like the apexi because I like to fiddle so am always changing some setting for the sake it.
rgds
Is it possible to set the apexi Power FC up yourself, whe dont have rx7 tuners here in the Netherlands.
Damn, I really dont know what to do.
WOuld bigger injectors help at first? What would you suggest. I think I probably should check my compression first to see if it is oke further.
Do you know if towing your rx7 is bad.
Hi Mate,
I don\'t know if owing it is bad, but the later version apexi comes already mapped for induction, midpipe, intercooler back box. So the base map would be fine on your car. You should not need injectors for just midpipe and back box, but this is something you can see with the apexi if you need bigegr ones anyway.
rgds
Hi, when you say \'later version Apexi\' what do you mean? Are you talking about the 16bit ones or a new one thats come out?
It depends where you purchase the Apexi from. From my limitied knowledge about the PFC, they come with some form of base map, so its almost true plug and drive option, unlike the Haltech which will need mapping.
I know of cars that have had bigger injectors and an aftermarket fuel presure regulator to cut out the leaning process. But this is NOT a proper cure, the ECU is.
If going for the Apexi ECU you will need either the hand controller or the datalogit product. The datalogit connects up to a laptop and gives more options allowing better definition.
Mail Geff (Geff@ReWorx.co.uk) for options.
Dan
Edited to add: BPG, all the Apexis are 16Bit, just different versions per year of car.
So if I bought an Apexi PFC for a 96 RZ would it be mapped for a induction, midpipe, intercooler & back box.
Yes it would.
I have the same on my car and it definetly comes mapped for that. Off the top of my head I can\'t quite remember I believe it\'s on any apexi version 5.04 or higher. The versions below this are mapped for just I think induction and back box.
RGDS
It depends where you get it from. If you go to one of the many places that sell Apexi products without knowing rotary\'s, you get a base map. If you was to go to ReWorx they should be able to put a close map on it. Plus as you are in the UK, they would be happy to sort out some form of mapping with it fitted to the car.
The problem Skim has is that he is not in the UK.
Dan
Hi Dan,
You can call me Rogier, yes indeed its my problem that I live in the Netherlands no dealers here. I have my own store in ordering parts and books from japan so getting an Apex ecu shouldnt be that kind of problem but setting it up will.
Can you set it up by installing an AF meter?
Rogier, using an AF meter will help quite a bit. Help to tell if its running rich or lean, although I thibk the Apexi will also display this.
If you wanted to go that bit further you could also install an EGT probe. This gives even more details of heat that the engine is producing. Most of the good engine mappers will go via this then via an AF meter.
Dan
ive also been looking at ecu\'s for a while. but my car is a 92 so the apexi will not be mapped for induction , full decat exhaust, backbox and uprated intercooler from what i can gather. is there anywhere that would be able to tell me?
also i read somewhere else on the forum that the apexi ecu\'s are all designed or premapped to run on 100 octane fuel because they are from japan. Does this lead to a problem in fuellin in this country if runnin the same base mods but with different octane levels?
The stock ecu on a rx7 is also mapped for 100 octane fuel so it makes no difference. If the apexi is bad ofor us because we only have 98 octane then the stock ecu is alo bad. This is a very debatable topic you can ask 100 people and get approx 50 different views on this, but I personally have looked into it a bit and can find no reason for an rx7 being affected at all by running 97 or 98 octane fuel when the ecu was originally mapped for 100
If so there would be problems on every car rx7 imported in this country standard or not.
rgds
I would have thought the ignition advance would be affected by octane changes not the fueling ... so if these ECU mods just change the fueling I can\'t see a problem
FYI...
I have Apexi PFC with datalogit and wideband a/f as well.
The stock maps that come with the PFC are very rich indeed, and the timing is fairly conservative if not the smoothest pattern I have seen.
As being far too rich is better than being far too lean, I think Apexi really went safety first.
This is running downpipe, midpipe, intake, etc etc.
Big improvements can be made to increase power and smoothness through altering these maps. Taking out fuel rather than putting more in, and better timing including split timing. You must do this with wideband tho!
I think the recent rolling road session at G-Force, where all the Apexi runners with stock maps had a/f ratio\'s off the scale proves my point ;)
You must keep an eye on injector duty though, as they go up to about 90% with the stock map on stock injectors at 0.9 bar.
Hope this is of help!
Regards
Max (stock twin) 304 rwhp pub talk.....eh Fish!
right you are max.
I have a back box, downpipe, induction, intercooler, and I am running way too rich on base map. I need to get Tim to set it up.
My mobile 4 gas measures a/f too and is supposed to be really accurate, so I think me and Tim might go bombing up and down Salisbury plains and tune it that way. Got some lovely roads down your area I ws down there the other week but too many cops for my liking.:)
rgds
Regarding the fuel cut, I think the only time when you see fuel cut is under max. load and max boost, or isnt that right.
The Apexi acts as a Fuel cut defensor as well - so no fuel cut. Your injectors will pump right up to the limit, but will probably melt eventually!
You will get a warning light flash on your dash to tell you when your injectors are maxing out.
You do not want to run injectors past 85% duty regularly.
The only cut you may experience is boost cut, where the boost goes beyond 0.2 bar higher than what you wanted it to be. Feels like running into a brick wall and very violent :(
Brian :) I have a great section of road nearby where I can do logged 3rd gear runs all day without much trouble, even 4th gear runs (just). Its fairly straight, two miles long and no junctions - lovely....
Regards
Max
should come to my place, a 10 minute drive and then you are in germany. You can do 175mph all day :D
Can tell you from my experience that it is fast:o
Think that tonight I\'m going to check how my cat looks, anybody some hints on how to disconnect the cat etc. easiest way.
Regards,
Rogier.
QuoteOriginally posted by BNA_ELLIS
The stock ecu on a rx7 is also mapped for 100 octane fuel so it makes no difference. If the apexi is bad ofor us because we only have 98 octane then the stock ecu is alo bad.
Brian, what about us UK owners, we are mapped for normal unleaded. ;)
Dan
Hi Dan,
Through asking lots of tuners and doing lots of searching on this I still have not found any suitable answers with regards to proof that a few octane makes any difference to reliability or performance of a rotary engine whether a UK car mapped for 95 octane using 98 rin is fine and a japanese mapped 100 octane using 95 is fine. I was suprised to fond out myself how much jap spec rx7 owners over here use normal uleaded. I think the main arguement is about heat and pre-ignition, I can understand the reasons people state in theory but still have not seen or found or heard any real evidence to back the theory up.
rgds