I just have all my vacuum hose replaced as well as having the following items installed in my car (stock motor & twins):-

1. M2 downpipe
2. Y-pipe
3. Catback (Apexi Hybrid Turbo)
4. ARC intake box

I have read about the 3 mods rule which is why I am looking to buy a boost controller to limit my boost to 10 psi for the time being. I am looking to go single turbo at Chrismas/New Year, so a new ECU is on my list as well but until then I think I should at least have a boost controller to limit my boost.

I have heard from my tuner (in hong Kong) that the EVC V is currently the best unit in Japan as there are Japanese magazines featuring comparisons of various latest boost controllers and it turns out that the EVC V (with its microprocessor built in stepping motor) is best at holding boost, even better than the Blitz SBC ID. But having said that, the tuner is an authorised HKS pro tuner, and his opinion may be biased (he also sell all other Japanese brands boost controllers). Initially, I thought that Blitz has the best Solenoid and Apexi has the most features.

Can anyone verify the accuracy of his statement?

The other question I have is about my single turbo conversion and hemy tuner has suggested the following (as I am aiming for 380-400rwhp):-

1. HKS T04e or Apexi IHI RX6B
2. HK S V-mount intercooler
3. HKS Clutch (he explain that HKS has some sort of patent on clutches which will engage only one plate during heavy traffic driving and all plates during a spirited run (my description may not be accurate)
Or Exedy Clutch
4. Twin Power Ignition
5. Upgraded Fuel pump, injector & regulator
6. (a) (i) FCON SZ with Navigator or (ii) Apexi PFC with Commander
(b) FCON V Pro (which can use the same solenoid of the EVC V as a feedback)

I am slightly confused about No.6 above. The tuner explained that the 6(a) (i) and (ii) provide similar results but 6(b) is a completely stand alone ECU which by-passes the stock ECU. However, 6(b) will be more comprehensive as it can also adjust the throttle response, etc. Can anyone shed some light on these ECUs?

Lastly, which of the turbos, the T04e or RX6b, have lessor lag? Can someone who has instaleed one of these turbos give me a rough idea of when full boost is achieved? And @ 15psi, what are their top end rwhp?

 

I have an EVC-IV (not V) on my single turbo Miata. I'm not pleased with it. It will briefly open the wastegate on occasion at boost levels below target. The V should be an improvement.

Why not go with an original Greddy Profec B? Many RX-7 and Supra owners are happy with it. Simple, effective and reliable.

Doc

 

I currently have the EVC 3 and really like it. I've had the original profec B in another car and really like it as well. If I had to choose between the two I would go with the profec B because of it's simplicity.

-Destin

 

I have an HKS EVC EZ2 on my car, which is basically an EVCV without the extra display unit.. works great on my TO4E. The Blitz unit is very good as well, I wouldn't go for the Apexi unit myself.. it is cumbersome to use in my opinion and has an awkard display that is hard to find a good place for in the car. Some people love it though.

 

Mjw, what rpm does you T04E make full boost?

 

Anyone with experience of these boost controllers?

 

The EVC IV seems to a good job if setup right. Setting it up (especially if you are running seqentially) is somewhat difficult. The "learning" mode has you do 3 WOT runs in 3rd gear preferrably (since it makes the most boost) from 2000rpm to redline (which also means you're going really fast). You need to do the 3 runs in a row which means you also need a lot of road.

For folks that have a chassis dyno to drop the car on or those that live in west Texas this shouldn't be an issue. For people in more populated areas without access to a dyno it can be.

It can also run in a "manual" mode where you set a desired peak boost level. Depending on what mods are on your car it may or may not do a very accurate job at controlling it. In "manual" mode here's how it did for me (settings tested at 0.55 and 0.70 bar):

Efini Y-pipe + cat-back exhaust: spikes up to .16 bar over settings (.86).
*Theory on this is the inconsistant airflow rate from the stock AI made it hard for the controller to figure out whats going on*

Efini Y-pipe, cat-back, Apexi Power Intake: spikes up to .03 bar over (.73 and .58).

Efini Y-pipe, cat-back, API, downpipe: spikes up to .16 bar over settings (.71 on a .55 setting, as soon as it hit .77 on the .70 setting I dropped to the .55).

I'm going to tune it this weekend if I can find time to see how well it controls the boost after learning. It has done a good job after "learning" except with the stock AI I still ran into the issue described above. Hopefully the "learn" lets it control the downpipe.

 

I had an HKS EVC that had a solenoid take a dump barely a year after owning it. HKS wouldn't sell just the solenoid, so now I went with a Blitz SBC-id. Just my input.

 

Just purchased a Profec-B spec1 off ebay cuz im tired of f'in with stock solenoids and needle valves. Havent recieved it yet, but i bought it solely because of the simplicity and the overall praise everyone gives it

 

SBC ID 3 with power meter