hiyall,not been on here for ages(shame on me!!)
just a quicky,thinking of getting an apexi power fc ecu,does it have antilag???

as i am thinking this may be a cheaper option to use on my rallycar instead of forking out nearly 2k for a gems or motec.
cheers
roy

 

May be wrong but i don't think they do have anti lag.

James

 

In a word, No.

You could look at a Sigma which is a cheaper version of the Gems and does have anti lag.

 

Roy,

YHM....

Steve

 

steve,ive not recieved the pm,,not sure if its my end ?

 

sorry mate,,ive got it !!!!!! ile be in touch

 

How do you get over the fact that the idle valve doesn't flow enough air for the antilag to work?

Simon

 

Simon,

There are a variety of options....

1. We can mod ABV to give more air flow.
2.ECU supports running with Jacked open throttle.
3.We have a throttle kicker kit.
4.You can keep it mild.

Steve

 

Also..

You will see a reduction in vacuum on overrun even with a std ABV if the fuel cut/ spark cut /Ign retard maps are set correctly. We have a number of "clubby" rally lads running this set up whop still wish to retain the brake servo function.

Steve (again)

 

You can do number 4 with an Apexi PowerFC..
Probably do 1~3 with a PowerFC too just not tried yet.

Simon

 

I'm sure I've read somewhere on here that you can get antilag with the PFC??

Can remember something about a switch under the throttle pedal, but is was a crude method??????

Anybody????

 

You can fit a Gonzo pipe which goes from the intercooler / throttle body pipe via a 'T' piece to the idle control valve.

I run my MoTeC this way

 

so whats needed to get anti lag on a pfc then?

 

To get effective ALS you need the following:
3D maps of:
Ignition retard - v - throttle position - RPM
2 xFuel cut % -v- throttle position - v -RPM(one for ALS on, one for ALS OFF but with throttle jacked open.
Spark cut - v - throttle position - RPM
Ability to fully open ABV when ALS enabled
Ideally ALS cut when Air temp > max value

I have not come across any of these features so not sure how you can do any form of ALS.If you are talking of just retarding the ignition on overrun to give a few pops and bangs....? That is not Option 4 above.

The Gonzo hose is essential to by pass the throttle body, but Simons point about the ABV not flowing enough air is still valid.On some cars we have fitted a Cossie ABV - this when slightly modified works well.

 

Sounds like the sort of thing Pat might come out with !

 

Based on what Steve Rally has said above - a different ECU for a start !

 

There is one other important factor to be taken into account on "rally" cars;the turbo will be restricted with either a 32mm or 34mm restrictor.To prevent "overspeeding" or "supersonic" air flow the boost is mapped to the depression across the restrictor orifice.That is we map the boost control solenoid to ensure the vacuum across the restrictor is not allowed to exceed a certain minimum value.This requires the software to have a 3D map of BCV Duty% -v- Load-v-RPM.You cannot just have one duty cycle value and allow the restrictor to limit the boost - this will certainly overspeed the turbo and result in premature bearing failure.

 

Sorry for being a bit dim - but can you explain to me what this means - I don't quite follow this.


So does the ECU you fitted to my WRX have this software in then ?

 

Overspeeding: On say a 32mm restrictor (GPN) the boost will begin to be limited by the orifice from around 4000RPM.Typically at 5000RPM you cannot get more than 0.8Bar, at 6000RPM o.6BAR and so on.This is why GPN cars make crap power!If you have the boost control solenoid running a duty cycle which is trying to get the turbo to achieve a higher boost than is physically possible, then the turbo will overspeed. Effectively the blades cavitate the air and generate high air temps.The turbo is spinning at a speed which is is trying to flow more air than is being allowed through the restrictor.This shows as a vacuum being generated across the restrictor. You can measure this by drilling a small hole thru the restrictor between the 32mm zone and the blades and connecting a vac gauge.You then adjust the boost control duty cycle to give the required vacuum.(typically -200mm HG max).

To do this you need a fully mappable boost valve with duty% against RPM.You do have this on your SIGMA ECU should you ever need it!

 

I'll take that as a compliment

 

You can do something very simple to do 4 yes..

Wasn't wanting this to be some argument.. we seriously asking how you sorted the lack of air with the idle valve.. not trying to trip up or anything.

Most valid for Rally cars and the odd hill climber etc..

Simon

 

How do you manage to 'do 4' on an ECU that doesn't claim to have ALS as one of it's functions ? Would be interested to know.

I don't see anything on this thread to suggest that anyone is either having nor wanting 'some argument'. Looks to me to be an interesting and informative discussion on what is needed to achieve ALS.

Also VERY interesting point that Steve made about the boost control. I for one had never thought about how a restrictor would require such precise control of the turbo.

Quite reassuring to know that the ECU I have includes all of this.

 

Simon,

Any update on the questions above ?

 

...

 

I think the last couple of posts in this thread linked below just about cover it

https://www.scoobynet.com/general-te...bhp-98-uk.html

Simon

 

oh