RE Amemiya ECU

[m1tch]

so how are these maps created? Does some use something like a pfc then copy the same map onto a chip?

They are usually done by the tuners like knightsports who change the OEM chip with their own, I can\'t really say about mine as they are copyright to the respective owners.

For profs hybrid he, like myself is running an e-manage ultimate, which just piggybacks the ECU and adjusts some of the mapping and tunes itself.

I have an AFR on mine, but until I get the clutch and actuator in I can\'t really check it as it drops to about 9:1 on boost due to overfueling lol

Yeah 0.9bar is the most you want to go with the OEM turbo, found that on the drag strip its really good for launches but runs out of puff about 2/3s down the run. Running 1bar plus will just mean stupidly high intake temperature as its outside of its efficiency, which is why most aftermarket maps run to 0.9 bar which is the safe limit of the injectors and where the oem turbo runs out of puff.

[m1tch]

The ally bonnet is on the todo list, a boost gage sounds like a good place to start

Boost gauge is the first thing you put in, try and get a mechanical one as the electrical sort can have errors if they have a bad earth etc.

[Prof]

prof - are these other chips for hybrid turbo\'s and do you have any other information on them? only reason i gave up on a hybrid was because i thought i\'d have to fork out for a mappable ecu.

The Hybrid turbo will just have a better efficiency map at higher boost levels - but the mapping in the chips should cope in as much as 0.5 BAR boost, 0.75 BAR and so on will be the same regardless of what pumped it in there.  I ran the Hybrid with the chipped ECU up to about 12 psi, but I didn\'t want to trust running higher boost without bigger injectors and the emanage to control and monitor it all.
 
I did a test with a couple of different ECU\'s, and most of the chipped ECU\'s do much the same thing with regards to fuelling and timing - with some differences in the maps.
 
In the stock ECU, the primaries do all the work low down in the map, and then at the transition point, they drop back to 40% and don\'t do much more - the secondaries do the rest of the work.  In the 2 chipped ECU\'s I\'ve tested, the drop is a lot less, and the secondaries stage in low to start with - and increase at a higher rate than the primaries.  The change point is about the same place in the map - but even on low boost - the primaries could be doing all the work.
 
I\'ve only checked timing on the Blitz Access ECU and compared it to the stock ECU - the split (difference between leading and trailing plugs) is reduced in the off boost part of the map, and the maximum advance is higher on the chipped ECU - the advance and split timings seem to be very close to the numbers Judge Ito put up on the RX7 club - I didn\'t do much at all with the timing apart from put some more retard in at the top end for safety.

[festa]

Cheers for all the advice, seams that if the car may already be running higher boost due to the exhust then I would be beter off running the chiped ecu to get more petrol in there and because I\'m not running up to the max 0.9 bar then the engine would be running richer not leaner so it should be on the safe side.
Also how does the larger exhust over ride the waste gate and allow the turbo to make more boost ?

[Prof]

Cos the wastegate isn\'t big enough
 
The stock wastegate is just able to control the boost with the heavily restrictive stock exhaust and induction piping.  The moment you start playing with either or both of these, you will see the boost go up, but more unfortunately also boost creep will begin to happen in the higher gears to start with, and if very bad in 2nd/3rd too.
 
The problem is even worse on the series 4 turbo cars, that just had a single wastegate hole.

[m1tch]

Check out FC3Spro for some porting advice, I have gone all out I have have a custom bell mouth downpipe which allows maximum flow for the turbo and maximum opening on the wastegate

[dthebuk]

Cheers for all the advice, seams that if the car may already be running higher boost due to the exhust then I would be beter off running the chiped ecu to get more petrol in there and because I\'m not running up to the max 0.9 bar then the engine would be running richer not leaner so it should be on the safe side.
Also how does the larger exhust over ride the waste gate and allow the turbo to make more boost ?

You should definately look at getting an AFR so you can see how rich the car is running on boost. Do you have an FCD fitted? When the TII\'s go over stock boost (by 1psi? could someone back that up?) they should cut fuel. If you\'re car isn\'t cutting fuel then chances are you either have an fcd, a chip or a pretty restrictive exhuast. Think your best bet is to get a boost guage to see what the car is actually doing.

[festa]

Had a look and there dosn\'t seem to be any FCD and had a look at the ECU in the car and its seems to be the factory stock one.
The exhust is standard down pipe and still has cat outer thats been hollowed out and a fujitsubo twin system from there back.