Best boost controller on twins

[Kriss]

Hello everyone!!!

I\'m going to fit a boost controller on my car (standard engine, \'99 spec sequential twins, blitz induction, straight 3" wxhaustt with HKS downpipe, V-Mount intercooler).
My 3 options are:
- boost controller kit for the Apex\'i Power FC: good to have everything on 1 display, but bad display to see values at a glance, expecially during day
- Apex\'i AVCR: I think the best (and more expensive) B.C. on market, awesome to set boost value in every gear...
- Blitz Dual SBC: maybe the best one for twins as it come with dual solenoid? And spec-S type could be ok (and cheaper) as it control up to 1.5 bar boost, enough for sequential twins

Which one will you suggest?

I\'m open to anyy advice... :chat :chat :cool

[Aubec]

Whats the issue you are trying to sort?  Boost controller won\'t do anything for creep on the twins, which I imagine you are getting with the straight through - you\'ll probably need to port your wastegate if you havent already.

[Kriss]

Whats the issue you are trying to sort?  Boost controller won\'t do anything for creep on the twins, which I imagine you are getting with the straight through - you\'ll probably need to port your wastegate if you havent already.

Mostly I\'ll fit a boost controller to better map the car, not to push on HP...

[HaywardRotary]

The Apexi ecu is the best controller for twins in my opinion.
Just get that setup right and it will be as good as it gets.
I have had cars come to me where people have said they can\'t get boost control on the twins with the Apexi,but I have never so far had one where I have not been able to get control of the boost.
Regards
Carl

[HaywardRotary]

Porting of the wastegate is not needed either.
Even on a full bridgeport the stack wastegate can control boost if done right.

[Kriss]

The Apexi ecu is the best controller for twins in my opinion.
Just get that setup right and it will be as good as it gets.
I have had cars come to me where people have said they can\'t get boost control on the twins with the Apexi,but I have never so far had one where I have not been able to get control of the boost.
Regards
Carl

You mean the boost controller kit for the Power FC, right?

[Aubec]

I think he means the PFC itself - it controls the twins using the factory solenoids already.

[HaywardRotary]

I mean the Apexi ecu it self, you don\'t need anything else.
Regards
Carl

[DR SCHNITZEL]

I remember pip telling me i needed a boost controller and i had a apexi pfc he had just mapped a few months after you mapped it but with no change in my setup. but i was non sequential. would this matter Carl?

[PGiljevic]

Um?

I am probably the only person in the world who has tested so many FD\'s of all types and list a small selection them on my web page under the VBOX testing section.

http://www.riceracing.com.au/vbox-iii-testing-tuning.htm

You will see in the 90-140km/h tests of a typical 3rd gar power plot (actually showing you the boost control pattern) that the typical Apexi PFC control is average. http://img176.imageshack.us/img176/5562/kostas7ausstockwe2.jpg

By far and away the BEST controller for the factory twins set up is the Greddy Profec  spec B I have tuned cars across the country fitted with these and nothing gives a better more consistent boost control pattern over both turbo\'s............ it absolutely DUMPS on the Apexi PFC control.

The WORST boost controllers are APEXi AVCR (worst rubbish I have ever wasted my time on!!!) and Turbosmart is almost as bad.

I have hundreds of data logs, I can\'t post all of them or host them as I have a life to live off the internet :Talking1 but if you want to believe someone about boost control on twins ask them to show you true vehicle logs off a track or road test (PFC data logs absolute minimum! though they lack in resolution and context) preferably somthing logging at 100Hz and then plot the boost pattern in say 3rd gear across engine rpm and vehcile speed, take a look at the track map and see how the response is and you will come to the same conclusion after you look at a few dozen that the Profec spec B is an amazing controller.

I use the Blitz SBC I color its better again in features but on a sequential twins ssytem its not as good, more suited to a very high powered single turbo car.

Hope this helps?

FWI

Poor boost control pattern really shows up in specific vehicle acceleration tests, it is real interesting to plot real time road HP v\'s boost control pattern and see the effects it has on acceleration

[PGiljevic]

PROBLEMS with Apexi PFC boost control

The Apexi PFC controlling stock solenoids while O.K. suffers from over shoot, poor response, Altitude variation (set it up a hill and then drive down and watch your boost spike and over boost!), and it will not hold boost well (usually drops off allot after peak tq).

The plug in Apexi boost control module is a total waste of time.

Best off to get a dedicated boost controller and really make the most of your twin turbo\'s (for a whole 2 minutes before they start leaking oil !!!!) :rollin

bang for buck the Profec B spec 2 is hard to beat (c7nt of a name to remember though lol!!!)

[shaunwil]

Plus don\'t touch the add-on bit of kit for the PFC, its pants. Only good part of it is the 3bar sensor.

PFC Addon:



Profec B Spec 2:



Very little changed between sessions bar the controller.

Shaun

[HaywardRotary]

I disagree Peter, I have found that properly setup the AVCR is very good.
Horses for courses I think.
Regards
Carl

[shaunwil]

Don\'t they make 2 completely separate bits of kit though ? I\'ve no experience of the AVCR, just the add-on for the apexi PFC.

Shaun

[PGiljevic]

I spent about 5 hours on a AVCR on sequential twins and it was an abortion, I\'ll dig up some logs and post them. The customer took it to various other people after I told him it was crap and they could not sort it either. He binned it and put in a Greddy Profec B spec 2 (lol model changes each time I type it hahaha). Anyway he had perfect boost control from that point on. Apparently they do work well on single turbo\'s but I never bothered after that initial experience.

Could have been a one off I admit, but it was pretty sh7t hence my glowing review.