Fiat Coupe Forum Fiat Coupe Forum
- Founded by Kayjey & James Northam - Funded by the Club for the benefit of all owners -
mixed RSS feedall RSS feeds
(this will scroll you to the RSS box)
Fiat Coupe Club UK
join the club
Fiat Coupe Forum
 
» Announced
    Old Forum BACK!
    Forum RSS feed!
    Images - finally!


» Related sites
    www.fiatcoupeclub.org
    www.fiatcoupe.net


» External data
    chatroom
    owners
 
Who's Online
0 registered (), 59 Guests and 7 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
2,607 Registered Members
65 Forums
108,872 Topics
1,295,489 Posts

Most users ever online: 546 @ 30/08/2007 19:16
Top Posters
stan 32079
barnacle 31764
Theresa 22716
bockers 20994
pinin_prestatyn 19865
PeteP 18589
JimO 17908
Nigel 16870
Jim_Clennell 16223
Vickster 15915
RSS Feeds
Club Events
Club Information
Track Events
Rolling Road/RWYB
Social Events
Non-UK Events
Coupé Related Chat
Coupé Spotting
Coupé News/Press
Buying/Selling Advice
Insuring a Coupé
Basic FAQ's
How to Guides
Forum Issues
Technical Problems
General Maintenance
Styling
Tuning
Handling
ICE and Alarm
Coupés for Sale
Coupés Wanted
Parts for Sale
Parts Wanted
Group Buys
Business Forum
Other Vehicles for Sale/Wanted
Other Items for Sale/Wanted
Haggling/Offers
Ebay links
Other Cars
Other Websites
General Chat
Topic Options
#1605684 - 06/08/2017 22:26 4 inch MAF
Laipy Offline
Newbie

Registered: 16/05/2014
Posts: 12
Loc: Romania, Suceava
Hello guys, I wanna make a 4 inch side intake, and I was wondering if the maf sensor will work without a honeycomb in front of it, or it will affect the idle? The car will be mapped after that to suit the bigger housing. Has anyone done this mode? Any advices?

Top
#1605685 - 06/08/2017 22:33 Re: 4 inch MAF [Re: Laipy]
knight7660 Offline
Competition Level

Registered: 16/12/2007
Posts: 2233
Loc: Windsor/ Reading
FC Performance have a 4 inch MAF conversion so drop him a PM mate
_________________________
LE53 (452BHp & 389ftlb's with Quaife)
Wine red VIS FOOFY
Audi RS4 B7

Top
#1605787 - 08/08/2017 19:56 Re: 4 inch MAF [Re: Laipy]
deannn_20VT Offline
My life on the forum

Registered: 12/08/2006
Posts: 1858
Loc: Poland
Why don't you ditch MAF and use MAP? That is if you are using a stand alone ecu.
_________________________
Self-built forged 20VT lump running GT2871R turbo, EMU Stand Alone & pushing true 350bhp & 350lbft.

Top
#1605908 - 10/08/2017 23:18 Re: 4 inch MAF [Re: Laipy]
Laipy Offline
Newbie

Registered: 16/05/2014
Posts: 12
Loc: Romania, Suceava
I'm on stock ecu!

Top
#1605918 - 11/08/2017 08:13 Re: 4 inch MAF [Re: Laipy]
Countrycruising Offline
Club Rep Europe, member 914
I AM a Coop

Registered: 12/09/2006
Posts: 14459
Loc: FCSS 01684 593187
Contact Flea on here or email him.

http://www.fcperformance.co.uk/
_________________________

www.facebook.com/fiatcoupes

Top
#1605944 - 11/08/2017 18:10 Re: 4 inch MAF [Re: Laipy]
Honza Offline
On a journey

Registered: 10/02/2006
Posts: 125
Loc: Czech republic
honeycomb before sensor has function - it make the airflow more even (velocity profile) across the pipe diameter, so you have more precise data from sensor... without it you get the data somehow distorted based on the shape of current velocity profile.. but it will somehow work.
_________________________
05 15.84s
06 14,79s
07 14,9s
09 14.4s
11 lot of things to do
.
.
17 back on the road smile and much stronger

Top
#1610226 - 21/10/2017 20:12 Re: 4 inch MAF [Re: Laipy]
Benharris24 Offline
Club member 1557
On a journey

Registered: 22/10/2016
Posts: 126
Loc: Southampton
What is standard maf size

What does increasing the diameter do and would you need to modify anything via remap or using avcr?

Top
#1610430 - 24/10/2017 17:01 Re: 4 inch MAF [Re: Laipy]
Laipy Offline
Newbie

Registered: 16/05/2014
Posts: 12
Loc: Romania, Suceava
Standard maf size is 76mm and it maxes out at around 400hp. If you increase the size of the housing you need to remap the ecu.

Top
#1610433 - 24/10/2017 20:23 Re: 4 inch MAF [Re: Laipy]
PhoB Offline
Reaping the fruits

Registered: 28/04/2008
Posts: 66
I tried to solve bigger MAF properly rescaled in bosch ecu. But this 2.10.4 ecu has some limiter and when new maf reads higher hex value than maximum value from oem calibration curve, its throw MAF DTC error. I bandaid it by disable this DTC message, but still have problems with stability around idle(very big injectors, ethanol fuel...)
Only way without DTC error is to not touch scale curve, just roughtly adjust maf axis to suit real condition. But still will be weird condition for example decel fuel cut will not be engaged correctly, ect.
So i decided to convert to "normal" standalone ecu.

Btw stock maf maxes at cca 300bhp and my tested 3.5" housing(bmw OEM maf housing incl. honey mesh) maxes at cca 400bhp. Confirmed by measuring, not repeating info from internet;)

Top
#1610449 - 24/10/2017 23:58 Re: 4 inch MAF [Re: PhoB]
kj16v Offline
My life on the forum

Registered: 12/02/2008
Posts: 1702
Loc: London
Originally Posted By PhoB
I tried to solve bigger MAF properly rescaled in bosch ecu. But this 2.10.4 ecu has some limiter and when new maf reads higher hex value than maximum value from oem calibration curve, its throw MAF DTC error...

...Btw stock maf maxes at cca 300bhp and my tested 3.5" housing(bmw OEM maf housing incl. honey mesh) maxes at cca 400bhp. Confirmed by measuring, not repeating info from internet;)



You can definitely get 400 bhp with the stock MAF and housing. I've done this myself.

Also there are two 10x1 MAF limit tables, one at CE3F and one at CE55. These allow you to raise the MAF limit - or you can just disable that nonsense by filling them with 255s laugh

Top
#1610480 - 25/10/2017 12:04 Re: 4 inch MAF [Re: kj16v]
PhoB Offline
Reaping the fruits

Registered: 28/04/2008
Posts: 66
Originally Posted By kj16v
You can definitely get 400 bhp with the stock MAF and housing. I've done this myself.

Also there are two 10x1 MAF limit tables, one at CE3F and one at CE55. These allow you to raise the MAF limit - or you can just disable that nonsense by filling them with 255s laugh


Im not talk about physical restriction, i was about voltage signal to ecu. I done 400bhp on stock maf also, but there is start to be lack of resolution for multiple boost levels or parthrottle accel at high rpm.

Two limiters tables, and others limiters i try to find not have influence on problem i noted, i think its must be somewhere some single value limiter of max kg/h value (MLMAX called in newer motronics) or something like that. I tested, last value on stock MAF curve is 1C95 hex at 5volt, which calculate is cca 914kg/h, i rescaled curve for 3.5" housing to read up to 1250kg/h at 5volt and every time maf signal passed 1C95 (which was in my curve little after 4volt) i recieved MAF error (incl.Injector light on dash). If you have different experience let us know.

Top