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
1 registered (1 invisible), 64 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
2,607 Registered Members
65 Forums
108,871 Topics
1,295,482 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
Page 1 of 2 1 2 >
Topic Options
#1559175 - 05/01/2016 21:05 Boost issue
Gavlar Offline
Enjoying the ride

Registered: 24/11/2011
Posts: 502
Loc: Dudley. W Mids
Hi fellas

I've just fitted a stage 1 hybrid turbo core and now getting ridiculous high boost problems. Before I changed the standard turbo I was getting no more than 1.2 bar of boost, it now goes off my gauge right round to the stop.
In fifth gear I can plant my foot and it'll boost to around the 1.8bar mark and bounce from 1.6-1.8bar.
In other gears it was boosting way way too much until about 15 minutes into driving when it seemed to calm down and settle at around 1.5 bar.

now my spec sheet ain't massive
stage 1 hybrid core
decat
gtec 2
4 bar fuel pressure reg
standard intercooler (EVO 7 one is fitted but not plumbed in yet)

I set the actuator to half mm pre load but boost was worse so I set it to how it came off my turbo originally which was no pre load.

Does the ecu have to learn again as I have changed turbo cores for a uprated higher flowing one?
There are no split pipes anywhere and the ebc looks okay but can't confirm.

I do know that I should get it on the rollers and have it mapped but I ain't won the lottery just yet and funds are tight after Christmas.

Does anyone know how I can manually turn the boost down.


Oh just to add...... I would rather change a clutch and timing belt on a coupe than re fit the poxy under tray. laugh
_________________________
From Turbo'd Minis to Turbo'd Coups

Top
#1559178 - 05/01/2016 21:27 Re: Boost issue [Re: Gavlar]
coupedummy Offline
Club member 1341
Je suis un Coupé

Registered: 25/09/2006
Posts: 8935
Loc: west bromwich
Manual boost controller? I have one here mate if you want it.
Boost pipes for controller in correct places? I remember having work on my coupe where a pipe was incorrect and was boosting way over.

http://www.enginebasics.com/Advanced%20Engine%20Tuning/Boost%20Spiking.html


Edited by coupedummy (05/01/2016 21:30)
_________________________

Top
#1559179 - 05/01/2016 21:32 Re: Boost issue [Re: Gavlar]
Gavlar Offline
Enjoying the ride

Registered: 24/11/2011
Posts: 502
Loc: Dudley. W Mids
I'll double check the piping thumb

I might take you up on the offer of the boost controller though.
_________________________
From Turbo'd Minis to Turbo'd Coups

Top
#1559181 - 05/01/2016 21:46 Re: Boost issue [Re: Gavlar]
Gavlar Offline
Enjoying the ride

Registered: 24/11/2011
Posts: 502
Loc: Dudley. W Mids
I've just found out about that the ecu does have to re learn.

going go disconnect the battery again and try again in the morning. My neighbours are going love me.
_________________________
From Turbo'd Minis to Turbo'd Coups

Top
#1559285 - 06/01/2016 17:49 Re: Boost issue [Re: Gavlar]
Gavlar Offline
Enjoying the ride

Registered: 24/11/2011
Posts: 502
Loc: Dudley. W Mids
Well I disconnected the battery over night. Re connected this morning lovely left it on tick over until the fans kicked in. Drove to work off boost.
on the way home in 3rd gear I planted my foot and watched the boost gauge. It peaked and 1.5bar then dropped to 1.2bar.

All in all I think it's okay. it aint over boosting anymore and feels lovely to drive. Bad news now is that i might need to sell it and get an estate car as the wife is moaning that we cant get us all in. (Me, wife, 3 kids).
_________________________
From Turbo'd Minis to Turbo'd Coups

Top
#1559323 - 07/01/2016 01:50 Re: Boost issue [Re: Gavlar]
SimonN Offline
On a journey

Registered: 11/09/2015
Posts: 147
Loc: Birmingham
2 adults and 3 kids does sound tight (in any car really), but I do feel for you, Gavlar. All that time, effort and headache to get your turbo sorted and you end up moaned at!

Top
#1559330 - 07/01/2016 08:37 Re: Boost issue [Re: Gavlar]
BBR Offline
Club member 1435 - Membership
My life on the forum

Registered: 15/05/2011
Posts: 1624
Loc: Hemel of the Hempstead
I have just uprated my Turbo so will remember this post when I get it all back together - thanks Gavlar...
_________________________
16v NA Blitz Blue

Top
#1559347 - 07/01/2016 11:44 Re: Boost issue [Re: SimonN]
Gavlar Offline
Enjoying the ride

Registered: 24/11/2011
Posts: 502
Loc: Dudley. W Mids
Originally Posted By: SimonN
2 adults and 3 kids does sound tight (in any car really), but I do feel for you, Gavlar. All that time, effort and headache to get your turbo sorted and you end up moaned at!


our other car is a multipla. It's ace. There is always a fear that the multipla will break down as it's getting old and we need a second car that we can all fit in comfortably. I'm eying up BMW m sport tourers.


Edited by Gavlar (07/01/2016 11:53)
_________________________
From Turbo'd Minis to Turbo'd Coups

Top
#1559408 - 08/01/2016 00:57 Re: Boost issue [Re: Gavlar]
SimonN Offline
On a journey

Registered: 11/09/2015
Posts: 147
Loc: Birmingham
I have a Superb estate (I can hear a few groans) but apart from a couple of niggles it's been great. It's seriously massive in the back, and I have the tdi 170 version so pretty pokey. BMW m tourer sounds good - I haven't driven a rear wheel drive for many years, good fun. To me a more natural way of driving but I'm not quite sure why.
Glad the turbo upgrade went Ok. I have a cartridge waiting to go in after I've finished the paint - I've picked up some good pointers.

Top
#1603524 - 29/06/2017 11:51 Re: Boost issue [Re: Gavlar]
postman Offline
Discoverer

Registered: 12/12/2015
Posts: 35
Loc: Germany
Hi everyone,

I noticed that my 20 VT won't reach it's overboost pressure of 1.2 bar anymore since yesterday (GTech1 fitted).
Boost kicks in normally at around 2500 rpm and is at 0.9 bar and increases to 1.0 bar to the higher revs (4000 - 5500).
May I look for boostleaks or is the Pierburg EBV on it's way out?
Rest of the car is stock.

Thanks and greetings smile

David
_________________________
20VT LE black 1999

Top
#1603540 - 29/06/2017 17:31 Re: Boost issue [Re: Gavlar]
suba Offline
Je suis un Coupé

Registered: 03/01/2006
Posts: 9844
Loc: SW London
Originally Posted By Gavlar


I do know that I should get it on the rollers and have it mapped but I ain't won the lottery just yet and funds are tight after Christmas.



It'll cost less than an engine rebuild after it goes pop....running a bigger turbo on a plug and play chip means you need to be prepared for engine damage I'm afraid.

Been there....done that! smile
_________________________
Rotary fun - 370 bhp per ton. GT30's are small you know?!??!?!?!

Top
#1603542 - 29/06/2017 17:33 Re: Boost issue [Re: postman]
suba Offline
Je suis un Coupé

Registered: 03/01/2006
Posts: 9844
Loc: SW London
Gtec chip should run 1.2 bar sustained boost, i'd look to run a proper boost controller as the EBV struggles with the chip in my opinion.
_________________________
Rotary fun - 370 bhp per ton. GT30's are small you know?!??!?!?!

Top
#1605919 - 11/08/2017 08:15 Re: Boost issue [Re: Gavlar]
postman Offline
Discoverer

Registered: 12/12/2015
Posts: 35
Loc: Germany
Hello again,

I replaced the EBV with this one

MAC EBV

which was recommended by coutrycruising.
Boost-Yoyos and low boost issues are gone but I noticed that it needs quite long to build up boost and when accelerating hard, so when overboost should kick in, boost is rising to 1,3 bar and then falling to 0,5 bar.
I disconnected the battery over night, but still the same.
Can somebody give me a hint why the ecu does that or is it the new ebv?

Greetings
_________________________
20VT LE black 1999

Top
#1605924 - 11/08/2017 10:03 Re: Boost issue [Re: postman]
GrahamL Offline
I need some sleep

Registered: 17/12/2005
Posts: 3471
Loc: Pothole City
Originally Posted By postman
so when overboost should kick in, boost is rising to 1,3 bar and then falling to 0,5 bar.


At what point in rev range is it hitting 1.3 bar and at what point is it dropping to 0.5 bar? Is it consistently doing that every time?

The new 3rd party EBV's (like the MAC) control boost better so they will usually reduce overboost compared to the original EBV.

Top
#1605958 - 12/08/2017 07:51 Re: Boost issue [Re: Gavlar]
postman Offline
Discoverer

Registered: 12/12/2015
Posts: 35
Loc: Germany
It's hitting 1,3 bar at about 2800 ~ 3000 rpm and is instantly after hitting that boost level dropping to 0,5 bar at around 3300 rpm.
In higher gears (3+4+5+6) it will increase boost slowly again (!) to 1,1 bar but it takes around 4 to 5 seconds to reach it again meanwhile engine is reaching its redline and so decreasing boost anyway.
Yes she does it everytime when i floor her hard, but not when slowly pushing the accelerator to the floor.
By slowly I mean to take about 2 seconds to push it all the way down.
_________________________
20VT LE black 1999

Top
#1605960 - 12/08/2017 09:54 Re: Boost issue [Re: Gavlar]
GrahamL Offline
I need some sleep

Registered: 17/12/2005
Posts: 3471
Loc: Pothole City
When the boost suddenly drops from 1.3 bar to 0.5 bar is it smooth or with a large jerk like fuel has been cut to the engine?

I'd try re-fitting the standard chip (if you still have it) and see how that affects the boost. If it seems OK then let me know your address by PM and I'll send you a new Gtec chip to try.

Top
#1605961 - 12/08/2017 10:15 Re: Boost issue [Re: Gavlar]
postman Offline
Discoverer

Registered: 12/12/2015
Posts: 35
Loc: Germany
Because the boost is falling very quickly it feels pretty hard.
But she's still accelerating so I guess fuel isn't cut.
I will try the standard chip and hope she will start, because I had massive problems with the immobilizer...
_________________________
20VT LE black 1999

Top
#1605962 - 12/08/2017 10:29 Re: Boost issue [Re: Gavlar]
GrahamL Offline
I need some sleep

Registered: 17/12/2005
Posts: 3471
Loc: Pothole City
Try the standard chip with immobiliser disabled, if you still have that one.

Top
#1606012 - 13/08/2017 16:25 Re: Boost issue [Re: Gavlar]
postman Offline
Discoverer

Registered: 12/12/2015
Posts: 35
Loc: Germany
Your're right I got both of them smile
Tried the standard chip again, but it is even worse than the Gtec 1. Boost will raise until 1 bar and will drop instantly to 0,5 bar again. The difference between the chips are that the standard chip will stay at 0,5 bar until redline.
And it makes no difference whether accelerating hard or not, so she will always fall to 0,5 bar.
With Gtec 1 boost may raise in higher gears to 1,1 bar again.
_________________________
20VT LE black 1999

Top
#1606013 - 13/08/2017 16:47 Re: Boost issue [Re: Gavlar]
GrahamL Offline
I need some sleep

Registered: 17/12/2005
Posts: 3471
Loc: Pothole City
Dump valve sticking or not holding closed properly? Do you still have the standard bosch diaphragm valve or one of the newer piston types?

Top
#1606014 - 13/08/2017 17:28 Re: Boost issue [Re: Gavlar]
postman Offline
Discoverer

Registered: 12/12/2015
Posts: 35
Loc: Germany
I have a bov from Monza, because the original one was leaking.
_________________________
20VT LE black 1999

Top
#1606019 - 13/08/2017 20:31 Re: Boost issue [Re: Gavlar]
GrahamL Offline
I need some sleep

Registered: 17/12/2005
Posts: 3471
Loc: Pothole City
I'd take it off to make sure it's not sticking or opening too early, or try another one if you can borrow one locally.

Top
#1606041 - 14/08/2017 10:53 Re: Boost issue [Re: Gavlar]
GrahamL Offline
I need some sleep

Registered: 17/12/2005
Posts: 3471
Loc: Pothole City
Is this the same coupe with the high crankcase pressure problem and rebuilt turbo? If so, maybe there's a problem with the turbo itself?

Top
#1606066 - 14/08/2017 21:07 Re: Boost issue [Re: Gavlar]
postman Offline
Discoverer

Registered: 12/12/2015
Posts: 35
Loc: Germany
You're right, its the same Coupé.
I will try to disconnet the hose from the wastegate actuator to check if the turbo and the bov is ok.
_________________________
20VT LE black 1999

Top
#1606166 - 16/08/2017 15:01 Re: Boost issue [Re: Gavlar]
postman Offline
Discoverer

Registered: 12/12/2015
Posts: 35
Loc: Germany
With the hose disconnected to the wastegate, boost goes way over 1,5 bar. So Turbo, boost pipes and bov are ok or am I mistaken something?
_________________________
20VT LE black 1999

Top
#1606170 - 16/08/2017 15:33 Re: Boost issue [Re: Gavlar]
GrahamL Offline
I need some sleep

Registered: 17/12/2005
Posts: 3471
Loc: Pothole City
Yes, the basic stuff should be OK then.

So it could be a problem with the electronic bleed valve or maybe the ECU itself is cutting back boost because it detects a problem.

Since it's a new EBV I wonder if the ECU is detecting a problem and cutting boost, are you able to scan for error codes? Even if the injection malfunction light isn't on it's still worth checking as not all errors will flag the warning light.

Top
#1606173 - 16/08/2017 15:42 Re: Boost issue [Re: Gavlar]
postman Offline
Discoverer

Registered: 12/12/2015
Posts: 35
Loc: Germany
ok I'll read the error codes right away.
_________________________
20VT LE black 1999

Top
#1606177 - 16/08/2017 17:14 Re: Boost issue [Re: Gavlar]
postman Offline
Discoverer

Registered: 12/12/2015
Posts: 35
Loc: Germany
Unfortunately the ECU didn't save any DTC's... or should I run a longer distance with various load on the engine, as the DTC's might have been cleared as I changed the chip again?
_________________________
20VT LE black 1999

Top
#1606178 - 16/08/2017 17:20 Re: Boost issue [Re: Gavlar]
GrahamL Offline
I need some sleep

Registered: 17/12/2005
Posts: 3471
Loc: Pothole City
Yes, stored errors are cleared if you disconnect the ECU or battery so you'll need to run it again with the boost cutting back a few times and then check for codes.

Top
#1606327 - 19/08/2017 12:32 Re: Boost issue [Re: Gavlar]
postman Offline
Discoverer

Registered: 12/12/2015
Posts: 35
Loc: Germany
I drove about 200 km and the ecu cut back boost several times. No DTC's were saved in the ecu. frown
_________________________
20VT LE black 1999

Top
Page 1 of 2 1 2 >