Boost spike problem ?

Grizzly · August 11, 2007, 02:43:54 PM

bottom left on the Diagram above ^

jon haines · August 14, 2007, 08:15:38 PM

i had this and pip said either apexi or fit a choke gasket in the exhaust system- basically a gasket with a 2" hole instead of the de-cat 3" hole, suggested making it out of thin steel myself. i opted for the apexi though. jon.

Grizzly · August 14, 2007, 08:32:52 PM

Do you mean Apexi Power FC or apexi Boost controler Because they would both sort the problem in diffrent ways. (PFC would just cover the extra boost with the fuel so it didn\'t run lean and the Boost controler would pre empt the Spike and manage it better)

BTW Profet B2 is the Boost controler to buy if you go that way

jon haines · August 14, 2007, 10:36:38 PM

apexi power fc with remap. the fc was programed to limit boost to .75 and sorted fuelling. pip said boost controller would sort out boost but car would still lean out. also said original ecu would not last long trying to cope with extra loads. with apexi intake + 3" straight through exhaust and fc now getting 300 at wheels and runs sweet.

Carl · August 14, 2007, 10:44:21 PM

Apexi power FC ecu can and does control boost and boost can be altered exactly as a boost controller.
On stock twins you don\'t need a boost controller,just get power FC and get it mapped.
It could just be that the pill is missing as some have said.
Regards
Carl

Grizzly · August 14, 2007, 11:29:46 PM

Carl, Does the PFC still control the boost if it doesn\'t have the extra Amal valve? I was led to belive the PFC was not good at controling the boost??

Grizzly · August 14, 2007, 11:33:21 PM

Quote from: jon hainesapexi power fc with remap. the fc was programed to limit boost to .75 and sorted fuelling. pip said boost controller would sort out boost but car would still lean out. also said original ecu would not last long trying to cope with extra loads. with apexi intake + 3" straight through exhaust and fc now getting 300 at wheels and runs sweet.

This confuses me, if you where not going for the extra power and was just dealing with the boost problem i don\'t get why the ecu would fail sooner or lean out if a boost controler limited the boost to the factory target boost?

Don\'t get me wrong though its proberly not the way to go (temp fix until you bought a PFC) but it would be the exhaust/induction kit that would cause it to lean out rather than the boost?

Carl · August 15, 2007, 08:17:02 AM

Quote from: GrizzlyCarl, Does the PFC still control the boost if it doesn\'t have the extra Amal valve? I was led to belive the PFC was not good at controling the boost??

I have not come across a combo on twins that have the pills in that I cannot control the boost yet.
It takes a bit of perseverance but can be done,after all the PFC is only controlling boost in exactly the same way that a boost controller does with the exception that it uses the stock solenoids.
Regards
Carl

chrno · August 15, 2007, 02:13:14 PM

Carl: Are you saying you can controll boost with a full through exhaust, say Vmount, airfilters and stock/aftermarket boostcontroller without boostspiking on stock twins? I am still thinking of contacting you after talking to Miguel@newera regarding tuners, but this sounds a little incredible since I hear so many stories of boostcreeping.. Spiking is one thing, but creeping?

Grizzly · August 15, 2007, 03:07:16 PM

I can vouch for the Profect B2 route, i had some really wacky overboosting problems that where sorted by fitting a Profect b (and spending a bit of time setting it up properly), TBH now i know the PFC does control the boost as well as Fuel it wouldn\'t suprise me if it could keep the boost in check with the right person tweeking it.

Carl · August 15, 2007, 08:43:30 PM

Quote from: chrnoCarl: Are you saying you can controll boost with a full through exhaust, say Vmount, airfilters and stock/aftermarket boostcontroller without boostspiking on stock twins? I am still thinking of contacting you after talking to Miguel@newera regarding tuners, but this sounds a little incredible since I hear so many stories of boostcreeping.. Spiking is one thing, but creeping?

It can be done,as yet I have not come acrross a combination with twins that we have not been able to get under control.
What boost are you running and how high is it spiking?
Regards
Carl

chrno · August 15, 2007, 09:21:02 PM

Carl: I will give you a call tomorrow or Friday, but basically I have not set up the car yet.. Mods I am running/will run is Greddy intake w hardpipes(fitted),Vmount(fitted),850/850 injectors(waiting for you),SARD 280l/h fuelpump(fitted),Feed Downpipe 3(waiting in garage)",Feed silenced midpipe 3"(Waiting in garage),Trust catback(Fitted), PFC(fitted running default map)Prodec b2(fitted but turned of, installed on both prespool and wastegate)

Basically I don\'t have a problem yet, but as I read alot of people having problems with creeps and spikes running full through exhaust on std turbos I am a bit worried. My bost is 0.5 first and second turbo atm.

Thank you for your reply

Regards, Daniel Gardh