FMIC performance gain.......

Meggsy · 20-05-2008, 21:16

I have just fitted a Jabba FMIC to the Octy (Exhaust, DV, filter, Std Map) and the car is a completely different animal.

The turbo lag has increased, which is expected but the boost pressure has increased from 0.8 bar to 1.1bar+.

I have read by lots of people on here that the FMIC should actually reduce power but it seems to have done the opposite on my car. The car seems to be much more powerful on boost and a lot quicker.

Does anyone have any experience of this? Should I be concerned? Could the old SMIC have been blocked / damaged?

Cheers

Fezboy · 20-05-2008, 21:22

I have the pro alloy on mine also but I'm running a custom IP map which is just over 1 bar so I'm not sure who your getting more boost on a standard map

Your not going to get much if any gains for a FMIC but it will keep the intake temps down and come the summer you will have lees heat soak

KenONeill · 21-05-2008, 12:57

An FMIC should not give more power unless it actually reduces intake temperature, and even then only if you increase fuelling to exploit the fact.

I am pleased to have a practical confirmation of my argument that the extra volume can cause lag though.

Johnny50 · 21-05-2008, 13:59

Extra lag is definately to be expected, but never seen one give more boost.

I fitted an HKS fmic to my Impreza, boost came in around 4-500rpm later then before fitting, and boost dropped around 0.2 bar overall.

Meggsy · 21-05-2008, 19:35

It definately is giving more boost!
Either that or the boost gauge is not reading right!!

Could it be related to the DV adjustment?

I am seeing just under 1.1bar boost on an un mapped car - is this normal? If so could it be that the old cooler was blocked?

Bigw2069 · 21-05-2008, 19:47

Maybe you have cured a boost leak by changing the IC and assossciated pipework

Fezboy · 21-05-2008, 19:48

Quote:

Originally Posted by Meggsy

I am seeing just under 1.1bar boost on an un mapped car - is this normal? If so could it be that the old cooler was blocked?

Like I said mine is custom mapped by IP and I'm only getting about 1.1 spike then holding 1 bar!

I know revo and jabba can give about 1.3bar but not sure how your getting 1.1 unmapped?

Have you had the car from new?

Are you sure it's not been mapped?

martziniuk · 21-05-2008, 20:14

1.1 bar is high for a standard car it should be around 0.8.

Meggsy · 21-05-2008, 20:59

Car used to boost to 0.8 bar - fitted FMIC and it now boosts to 1.1 and settles to 1 bar.

Had the car for a year and bought from HSBC bank manager! pretty sure its not mapped!

KenONeill · 22-05-2008, 09:40

Ah, if the DV has been adjusted, that could be giving you more boost before it dumps. If a FMIC makes a difference to the charge temperature, you'll get T \/ , which will lead to P\/ .
Supporting reference:- Thermodynamics - Wikipedia, the free encyclopedia

Johnny50 · 22-05-2008, 09:43

Ken,

Are you just a living, breathing book of knowledge ???

Certainly know a lot about certain subjects.

Obviously stuck in at the old Physics

martziniuk · 22-05-2008, 10:01

Quote:

Originally Posted by KenONeill

Ah, if the DV has been adjusted, that could be giving you more boost before it dumps. If a FMIC makes a difference to the charge temperature, you'll get T \/ , which will lead to P\/ .
Supporting reference:- Thermodynamics - Wikipedia, the free encyclopedia

Not sure about this, the dv should always be shut when on full boost therefore should give same figures, unless its leaking but that would give less pressures. I suppose you could get a brief boost kick when you let power off quick if dv spring was too strong.

KenONeill · 22-05-2008, 10:01

It feels like yes, or maybe I'm just bright enough to know who to ask?

KenONeill · 22-05-2008, 10:09

Quote:

Originally Posted by martziniuk

Not sure about this, the dv should always be shut when on full boost therefore should give same figures, unless its leaking but that would give less pressures.

I understood that a DV was an alternative to a wastegate, in which case surely its function is to restrict maximum boost?

martziniuk · 22-05-2008, 10:19

Quote:

Originally Posted by KenONeill

I understood that a DV was an alternative to a wastegate, in which case surely its function is to restrict maximum boost?

thats the n75 dv lets off when there is to much pressure, say when you let your foot off. It prevents the turbo fins bending etc. Afaik

20-05-2008, 21:16	#1
Meggsy Briskodian Join Date: Jun 2007 Location: Derby / Exeter Posts: 147 Thanks: 15 Thanked 3 Times in 3 Posts	FMIC performance gain....... I have just fitted a Jabba FMIC to the Octy (Exhaust, DV, filter, Std Map) and the car is a completely different animal. The turbo lag has increased, which is expected but the boost pressure has increased from 0.8 bar to 1.1bar+. I have read by lots of people on here that the FMIC should actually reduce power but it seems to have done the opposite on my car. The car seems to be much more powerful on boost and a lot quicker. Does anyone have any experience of this? Should I be concerned? Could the old SMIC have been blocked / damaged? Cheers __________________ 2003 Black Magic Octy VRS Current Mods - Milltek Exhaust, Forge Recirculating DV, Pipercross panel filter, Fast rd Pads and Discs, Coilover kit, Front mounted intercooler, 18" Alloys, Forge TIP, a few stickers and plenty of ICE Planned Mods - Highflow Cat, Custom Re-map

20-05-2008, 21:22	#2
Fezboy Briskodian Join Date: Aug 2006 Location: Watford Posts: 2,329 Thanks: 19 Thanked 113 Times in 107 Posts	Re: FMIC performance gain....... I have the pro alloy on mine also but I'm running a custom IP map which is just over 1 bar so I'm not sure who your getting more boost on a standard map Your not going to get much if any gains for a FMIC but it will keep the intake temps down and come the summer you will have lees heat soak __________________ Octavia VRS A standard looking car with a twist of Impossible Performance Herts South Mimms Meet 30.10.2008

21-05-2008, 12:57	#3
KenONeill Briskodian Join Date: May 2006 Location: Normally somewhere in Scotland! Posts: 10,381 Thanks: 56 Thanked 491 Times in 482 Posts	Re: FMIC performance gain....... An FMIC should not give more power unless it actually reduces intake temperature, and even then only if you increase fuelling to exploit the fact. I am pleased to have a practical confirmation of my argument that the extra volume can cause lag though.

21-05-2008, 13:59	#4
Johnny50 Here's Johnny ! Join Date: Nov 2004 Location: Edinburgh Posts: 5,047 Thanks: 192 Thanked 139 Times in 135 Posts	Re: FMIC performance gain....... Extra lag is definately to be expected, but never seen one give more boost. I fitted an HKS fmic to my Impreza, boost came in around 4-500rpm later then before fitting, and boost dropped around 0.2 bar overall.

21-05-2008, 19:35	#5
Meggsy Briskodian Join Date: Jun 2007 Location: Derby / Exeter Posts: 147 Thanks: 15 Thanked 3 Times in 3 Posts	Re: FMIC performance gain....... It definately is giving more boost! Either that or the boost gauge is not reading right!! Could it be related to the DV adjustment? I am seeing just under 1.1bar boost on an un mapped car - is this normal? If so could it be that the old cooler was blocked? __________________ 2003 Black Magic Octy VRS Current Mods - Milltek Exhaust, Forge Recirculating DV, Pipercross panel filter, Fast rd Pads and Discs, Coilover kit, Front mounted intercooler, 18" Alloys, Forge TIP, a few stickers and plenty of ICE Planned Mods - Highflow Cat, Custom Re-map

21-05-2008, 19:47	#6
Bigw2069 Moderator Join Date: Jan 2004 Location: Rosyth,Scotland Posts: 5,417 Thanks: 202 Thanked 206 Times in 170 Posts	Re: FMIC performance gain....... Maybe you have cured a boost leak by changing the IC and assossciated pipework __________________

21-05-2008, 20:14	#8
martziniuk Need more power Join Date: Feb 2007 Location: Driffield, Good old yorkshire Posts: 1,749 Thanks: 37 Thanked 127 Times in 126 Posts	Re: FMIC performance gain....... 1.1 bar is high for a standard car it should be around 0.8. __________________ Regards Martin Turbo back blueflame exhaust ,Forge FMDV006 Dump valve, Autobahn88 TIP, CAI ,Remapped, FMIC soon.....

21-05-2008, 20:59	#9
Meggsy Briskodian Join Date: Jun 2007 Location: Derby / Exeter Posts: 147 Thanks: 15 Thanked 3 Times in 3 Posts	Re: FMIC performance gain....... Car used to boost to 0.8 bar - fitted FMIC and it now boosts to 1.1 and settles to 1 bar. Had the car for a year and bought from HSBC bank manager! pretty sure its not mapped! __________________ 2003 Black Magic Octy VRS Current Mods - Milltek Exhaust, Forge Recirculating DV, Pipercross panel filter, Fast rd Pads and Discs, Coilover kit, Front mounted intercooler, 18" Alloys, Forge TIP, a few stickers and plenty of ICE Planned Mods - Highflow Cat, Custom Re-map

22-05-2008, 09:40	#10
KenONeill Briskodian Join Date: May 2006 Location: Normally somewhere in Scotland! Posts: 10,381 Thanks: 56 Thanked 491 Times in 482 Posts	Re: FMIC performance gain....... Ah, if the DV has been adjusted, that could be giving you more boost before it dumps. If a FMIC makes a difference to the charge temperature, you'll get T \/ , which will lead to P\/ . Supporting reference:- Thermodynamics - Wikipedia, the free encyclopedia

22-05-2008, 09:43	#11
Johnny50 Here's Johnny ! Join Date: Nov 2004 Location: Edinburgh Posts: 5,047 Thanks: 192 Thanked 139 Times in 135 Posts	Re: FMIC performance gain....... Ken, Are you just a living, breathing book of knowledge ??? Certainly know a lot about certain subjects. Obviously stuck in at the old Physics

22-05-2008, 10:01	#13
KenONeill Briskodian Join Date: May 2006 Location: Normally somewhere in Scotland! Posts: 10,381 Thanks: 56 Thanked 491 Times in 482 Posts	Re: FMIC performance gain....... It feels like yes, or maybe I'm just bright enough to know who to ask?

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