APexi AVCR Boost Controller

[BlitzBoy]

Has anyone fitted this boost controller to the twintub RX7?
and did they have any problems with the sequential setup of the
car?

[Grizzly]

It can be done but try to keep it simple on the twins, the solanoids arnt the most reliable things in the world and the Pipe work is a bit of a knightmare too.

Have you uprated the ECU/Fuel system? if so what ECU are you running?

If its a Power FC then you can add a simple Amal valve that is controled by the ECU and can be ajusted by the Controler. Most other Uprated ECU's are very simalar Haltech,Motech etc

I would steer away from the Piggyback type boost controlers and keep it as simple as possable.

Chris

[BlitzBoy]

cool, I'm still looking to buy my first rx7 3rd gen, I've just got an oppurtunity to buy an APEXI AVCR cheap at the mo.
I've looked on a link to a website from here that shows the installation on a Rx7, it doesn't look to hard to do.
Whats the most boost are u able to run without ecu mods?

[bnaellis]

Blitzboy,
I think the max the standard apex seal can take is 15psi approx .95 bar You can run higher boost but would not be a wise choice with standard apex seals especially if you have above average mileage.

rgds


Brian Ellis

[BlitzBoy]

cool, I heard conflicting points that the FD runs 12 psi standard,
but some people say its only 10 psi.
I thought it was 10(first turbo)-8-(Second turbo)10psi.
Which is true??
I think 14psi to 15 psi would provide quite a kick in the back in
an already fast car !:D

[bnaellis]

Blitzboy,
Pre 96 run 10 psi
I believe that post 96 pre 99 run a tiny bit higher but more or less the same and post 99 ran approx 11.8 psi I say approx cause I knwo in mmhg but don't know exactly the conversion to psi.

rgds

Brian

[BlitzBoy]

ahhh that explains why post 99s run 280bhp due to the different turbos and running higher boost.
So by running a pre 96 (uk spec for example) at 13 to 14 psi it should run 280 or more bhp, Am I correct in this assumption?
What spec is your 3rd gen running at Brian?

[bnaellis]

I found a converison I think it's right the 99 spec 280bhp rx7 runs at 570 mmhg which is approx 11 psi
If you had a normal 265 bhp rx7 and upped the boost a little yes you would hit 280 quite easily. The main changes on the 99 spec to increase power to 280bhp were the turbo's for better accelerated air flow, 10% less exhaust back pressure, 80% better flow to the intercooler, and increase in boost pressure in the ecu.
I have a 98 Touring X (auto)
my boost gauge shows I am running .8bar but I doubt it very much, I guess a slight inaccuracy with the boost gauge. The boost was not actually changed as such on post 96 pre 99 cars but it had a ecu that managed the fuel and turbos better than pre 96 cars. I have a blitz catback & blitz induction kit, a better flowing exhaust does raise boost but I do not think my blitz catback would raise boost to .8bar on it's own yet maybe I don't know. I am taking my car to a dyno soon to see how it performs as I have someone coming over from Japan in April with some goodies for me one of which being a panspeed hiflow cat so I will perform another dyno then and see how the increased flow affects things.

rgds

Brian Ellis

[BlitzBoy]

So your running about 11.6 psi at the mo.
Cool..the mods I'm planning (getting ahead of myself as haven't got the car yet lol) Will be the Apexi Boost Controller (13-14psi), Blitz NUR exhaust, Decat pipes with downpipe (of course I will retain the cat for MOT time),Trust Airinx dual intake filter system, this should net 280 bhp plus on a uk spec or I'm missing something?

[bnaellis]

LOL. Rather than the apexi boost controller with those mods you would need an apexi ecu, apparently boost can be controlled with this also, I do not know how well though. with the rest of the mods stated you will be above 280 bhp. Once the catalyst converter is removed and replaced witha midpip you release a serious amount of power. You can leave boost standard with those mods you want and still hit 300 bhp. A lot of power is released when you de-restrict the rx7 exhuasts system.

rgds

Brian

[BlitzBoy]

Yes Apexi Power FC ECU would be the way to go, but given its price I would keep that on hold until I would save enough dosh
for a single turbo conversion (one can dream for now lol) and do it all in one hit.
Does the Power FC handle bigger injectors when doing single turbo conversion? I suppose that question would be best answered by someone who has done it on this forum.

[bnaellis]

Yes it does, it both handles bigger injectors & additional injectors.
rgds

Brian

[BlitzBoy]

Thanks for your help Brian...
now to get the car :D .
I see you live in Croydon, I only live down the road in Sutton, so we will have to hook up once I've got it.

[bnaellis]

Sure mate. I am often just down the road from you in wallington actually. I got alot of family that lives down that way.
When you planning on getting one ??

rgds

Brian

[BlitzBoy]

My insurance money will be coming in 2 weeks I've been told,
So March time, hopefully the 2 uk spec FD rx7s I've seen for sale will still be available when I come to buy

[Grizzly]

Your about Right, Get a Power Fc which will tell you your Injector Duty and you can run basicly as much boost as you want as long as the duty does not go over 85%. To get you Duty down so you can run more boost you need to fit a Pump, Injectors, Intercooler etc.

I would go see a proper Tuner WGT,REWorks etc and get pro advice becouse if the car is not 100% when the boost is turned up it will detonate and then the Apex seals will be damaged needing a rebuild (The stock Apex's will handle any boost if there is enough fuel there and set up correctly).

Thre best peice of advice i can give you is Dont skimp and try to cut corners, becouse a Seven will turn around and bite you in the Wallet.

Chris

[bnaellis]

You also don't need to raise the boost to 12-13 psi as the mods you talk about doing the boost will be that anyway what you wnat is to be able to control the boost a sit rises, which it certainly will do when you change complete exhaust system.

rgds

Brian

[bnaellis]

Blitzboy I got a meeting with my accountant today in Sutton.
So if you see a black kitted out rx7 which you can hera from 1/2 a mile away than that will me mwa.

rgds

Brian

[BlitzBoy]

Yo Brian two more weeks until I get my money:)
In regards to the Power FC and the commander, are you able to
set boost levels with this and will this negate the need for a seperate boost controller, also does the Power FC handle the Big Single turbo convertions?

[Fooboy]

Blitzboy in answer to all your questions regarding the Power FC, yes yes yes and yes.

It does boost control, but probably not as sophisticated as some aftermarket controllers such as the AVCR as that can do different boost in different gears etc. Less in first gear to limit wheel spin, more in later gears etc.

The only thing limiting it is it uses the stock sensors that only read up to 17 psi. If you want to go over that you will need to get the PFC boost controller kit with new sensor or else a piggy back system.

Although it can be done, I wouldn't turn up boost without some sort of programable ecu to adjust fuel etc, you are just asking for trouble. Also an upgraded intercooler is really needed to make the most of boost increases.

As others have said, a full 3inch exhaust and dump pipe will give a heap more power. My car and a friends that pretty much only have intake and exhausts done put out a bit more than 160 rwkw (215rwhp) on a dyno. :)

[BlitzBoy]

Originally posted by Fooboy
I wouldn't turn up boost without some sort of programable ecu to adjust fuel etc

So can't you adjust the fuel with the Power FC Ecu then? sorry
bit confused

[Kevint]

Brian,

Way earlier in this thread you commented on not knowing exact conversion from mmHg to PSI. There is a free utility that will do this for you and a whole host of other useful conversions (acceleration, speed, torque etc.):

www.joshmadison.com/software/convert

Cheers

Kevin

[bnaellis]

Thanks Kevin,
I found one in the end. Still don't know why mazda do their figures in mmHg.

Cheers

Brian Ellis

[BlitzBoy]

yeah PSI or BAR is what everybody understands.
Come on someone answer question about the Power FC, can
you adjust the fuelling with it? :p

[bnaellis]

yep you sure can. The bit where you got confused is when he mentioned pggyback computers which the power fc is not.

rgds

Brian