DDS789

iTrader: (2)

Hi All

Been told today that my apexi will only let me go to 1bar boost pressure, so if i want to run more i need a new ECU...... Is this so? Is it that i need the apexi boost controller too?

Its on a 1995 WRX Type RA

Thanks

scoobyride

iTrader: (8)

are you using a boost controller on ur car at all? as far as i am aware the apexi needs a boost controller

DDS789

iTrader: (2)

No I havent got one at all, didnt realise i needed one with the apexi. But sounds like i do

Another thing to add to the list of stuff needed

MartynJ

You don't need a new ecu, just the Apexi boost control kit to go with what you have. The problem is that the stock MAP sensor is only a 2.2 bar sensor, the Apexi boost control kit comes with a 3.5 bar sensor.

Slowboy Racing

If you’re referring to the Power Fc then it’s not correct, it can run as much as your mapper and current setup permits. You will however be limted by your map sensor assuming it's the original unit. This will need to be swapped for a post 97 map sensor to allow boost over 1.2 Bar.

Slowboy Racing

If you’re referring to the Power Fc then it’s not correct, it can run as much as your mapper and current setup permits. You will however be limted by your map sensor assuming it's the original unit. This will need to be swapped for a post 97 map sensor to allow boost over 1.2 Bar.

DDS789

iTrader: (2)

Is there a way round that problem? Or am i stuck at just 1bar?

Thanks for the replies guys helps a bunch

DDS789

iTrader: (2)

Is there a way round that problem? Or am i stuck at just 1bar?

Thanks for the replies guys helps a bunch

DDS789

iTrader: (2)

Oh thats good to hear, i was under the impression that i wasnt limited by a boost controller and defo not the ECU!!

They said they would normally put it up to 1.3bar (engine is fine for much much more, but everything else needs uprating) but they are stuck at the 1bar and its the apexi holding me back

Its had a 2.1 conversion, TDO5 16G, 440's ect so can run that boost easily.

brashy

hi mate i had an apexi on my94 an my mapper could get it to boost to 1.2bar but to got higher you need to get a boost controller (electronic controller not manual) because with the apexi the only way to get it over the 1.2 bar is with a controller dont get a map sensor off a later model coz it wont work with the apexi

DDS789

iTrader: (2)

Ok so will run it all by them monday when i collect the car. Something to save up for i guess.


First thing they told me was how well it goes even though its only running lowish boost, one plus is my gearbox will be safe...... well maybe lol

brashy

i got a gerddy boost controller cheapish but do a good job but when you fit it make sure you get it mapped coz they will set it up proply for you dont make the same mistake i made, i fitted mine myself first an ended up blowing the piston rings coz i kept boosting to 1.48 bar oops learn by your mistakes, but once i fixed the engine then had it mapped proply it ran nice boosting to 1.34 bar then drop off an hold 1.2bar

DDS789

iTrader: (2)

Id have fitted one myself before my rebuild, but deffo wouldnt now after the last bill for my car lol

Ill have a good look into them and see where i stand monday. The guys doing mine know exactly what theyre doing mapping wise, just knew in my head a new ECU wasnt needed and glad i was right.

Cheers for the advice

brashy

no probs mate

joz8968

iTrader: (13)

Thing is the Apexi boost control kit (bespoke MAP sensor + BCS) is mega expensive. Best to try to snare one 2nd hand - or just the MAP sensor itself, if you can (rare though )

You could use a MY97/98 or MY99/00 MAP sensor but, IIRC, JGM says that PFC doesn't work that well with them.

Or try getting a 2nd hand AVC-R. I think these have exactly the same MAP sensor as the Apexi boost control kit, plus you can benefit from having the mapper tailoring your in-gear boost targets with the AVC-R itself (plus a nice little in-car gizmo )...

DDS789

iTrader: (2)

Thanks for the advice Joz

So for example, one of these....

http://cgi.ebay.co.uk/JDM-Apexi-AVC-...item2a0641705e

P600wrx

iTrader: (1)

i'm running the the power fc and the avcr and it's awesome although only running 1 bar of boost it is sooooo smoth the gears and boost is way better than anything i used to have, going for a re-map soon to push it too 1.2 as it's an everyday car and the scrammble switch for that bit more when needed

joz8968

iTrader: (13)

Yep, that's the AVC-R. Comes complete with harnesses, Apexi 3-port BCS and that 3bar MAP sesnor.

You may as well get it, as the boost control kit costs pretty much the same! (effectively the same, but WITHOUT the AVC-R unit/wiring!!!).

So that way the mapper can not only run the optimal boost target setting thus releasing your current "capped" power, but he can map individual in gear boost settings for optimal performance as well. Do it!

joz8968

iTrader: (13)

BTW, that one is for a Civic, I think.

Make sure you get the correct one compatible with the Impreza/your MY PFC (unless the AVC-R is universal )...

DDS789

iTrader: (2)

Yeah figured it wouldnt be the right one as most of them are specified to a car. Suppose the unit itself is universal but the harnesses and Map sensor will need to be suited towards an impreza?

There was a small list of things the mappers wanted me to sort out to reach its potential (RR figure wise atleast)

-Obviously what weve talked about

-New Walboro 255 as mine is quite tired

-Undertray on the bonnet, i put the STI 5 IC on to rid the car of the slanty, but havent figured a good way to direct the air from the scoop to the IC........... yet . They said it suffered loads of heat soak on the RR

-Oh and a possibility of a sticking/dragging caliper

Resulted in a dissapointing 277bhp on the rollers. A big BUT though, both mappers said the car performed nothing like its RR figures on the road, they said they were both stumped by it, my crazy car i suppose lol.

joz8968

iTrader: (13)

Yes defo sort all those things, before getting it all mapped.

Maybe the caliper's piston is stuck in the "proud" position slightly (or a lot!), thus causing the pads to contact the discs all the time? If so, this may well adversely reduce - to a lesser or greater degree - some of the power seen at the wheels (after all, they do use that figure to convert to the flywheel figure ).

DDS789

iTrader: (2)

Its done the dragging thing before, it was the pads sticking on the sliders (well i thought it was) But i can guarentee it will be the front drivers side one lol culprit last time. The mapper said he could feel the car dipping to one side under braking, exactly what it did last time.

Cars been mapped as is, i only learned this after they mapped it as i wasnt there during the mapping. Its the first map after it was rebuilt and run in. Im sure that when iv done the above they will just charge me for a tweek. Tbh this AVC-R will have to wait till the car is running good, as in, when the other items on the list are sorted.

The AVC-R sounds brilliant though, so looking forward to getting one. Would i be right to assume i could get one through Andy Forest? I see he really rates the Apexi stuff.

joz8968

iTrader: (13)

He presumably sells the PFC for mapping (as he lists it in his stages of tune)... so no doubt he'll stock the AVC-R too.

Also, from memory, when I was at API a couple of months ago, I'm sure I saw an AVC-R for sale in their glass display cabinet. Give 'em a bell - if it has been sitting there for a while, you might get some kind of 'deal'...

DDS789

iTrader: (2)

Good call. Will defo phone David at Api, talked to him about my rebuild but he was too far away for it to be convenient for running in services ect. Still gave me loads of advice, top bloke.

joz8968

iTrader: (13)

Yep, David has been a mine of information, advising me to get all the correct bits together for my next round of mods/mapping....

flat4monster

Hello guys!
Everybody in here seem knowledgeable so I'm gonna ask a question and see if any of you can help me out pls
I have a 1998 STI Impreza all forged with an apexi ecu currently running @ 320bhp...the car has also had a full engine rebuild and has an HKS front mount intercooler with a P1 Turbo conversion.
My question is if I install an Apexi boost controller will I be able to increase my power(bhp) to 340bhp & will it be safe? Also can I DIY it??

Many thanks for your support
Mark

bigsinky

holy thread resurrection batman

joz8968

iTrader: (13)

I cant believe this thread is all but 14 months old! Feels like 'yesterday' when posting in it.