nod911
Member
Registered: 28th Jan 05
User status: Offline
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I havent owned a corsa before so i am not sure if what i am experiencing is normal. The engine pulls nice from idle till about 3000-3500 rpm where it quite noticibly hits a flat spot until about 4500 rpm when it takes back off right till redline. The car is making nice power above 4500 and feels quite strong other than the problem mentioned. It is quite anoying because at freeway speeds i am sitting right in the middle of that flat spot....meaning i have to drop back a gear if i need to get moving quickly. The plugs have recently been changed.
I would appreciate hearing everyones thoughts, Thanks alot.
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Rileysport
Member
Registered: 18th Jun 04
Location: West Yorkshire
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should be starting to pick up at 3k ish rpm not flattening out
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nod911
Member
Registered: 28th Jan 05
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Sorry i should also mention the engine has a 2" exhaust system fitted and uses factory airbox.
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Rileysport
Member
Registered: 18th Jun 04
Location: West Yorkshire
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2 inch exhaust... otherwise standard ? probs why you have a flat spot 
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nod911
Member
Registered: 28th Jan 05
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Thanks for your reply mate. So you think the problem may be the larger exhaust, what could i do to cure this problem? And may i also ask why the exhaust would cause this problem?
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Rileysport
Member
Registered: 18th Jun 04
Location: West Yorkshire
User status: Offline
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is it 2 inch bore pipe all the way thru? the bore size moves the power about a bit , i.e larger bore = better gas flow, for top end but no back pressure for any low down power, thats on bikes, assume cars work similar
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nod911
Member
Registered: 28th Jan 05
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well i bought the car as is, but when last under the car it looks like it runs from the standard exhaust manifold back.
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Rileysport
Member
Registered: 18th Jun 04
Location: West Yorkshire
User status: Offline
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check air filter etc, ht leads too... but i think 2 inch is a little large for a 1.6
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nod911
Member
Registered: 28th Jan 05
User status: Offline
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ok, thanks for the advice
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Siberia
Member
Registered: 9th Oct 03
Location: Leprechaun Land Drives : Zafira GSI
User status: Offline
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what bors is a 1.2 8v exhaust? whatever it is i have that as my cat back...
car pulls like a mofo
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
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2" is spot on for a 1.6 really mate!
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nod911
Member
Registered: 28th Jan 05
User status: Offline
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Is it a common trait of the X16XE to behave as described above?
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Joff
Member
Registered: 17th Oct 00
Location: Cambridgeshire
User status: Offline
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Exhaust is fine, the 1.6 16v engines are just crap.
I said that all the time I owned mine and no-one would believe me 
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Rileysport
Member
Registered: 18th Jun 04
Location: West Yorkshire
User status: Offline
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You lie joff... you lie, oh and whilse i'm at it is that cat converter thing i bought actually a cat converter ?
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Joff
Member
Registered: 17th Oct 00
Location: Cambridgeshire
User status: Offline
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It's not a cat converter.. it's a cat pipe.
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Rileysport
Member
Registered: 18th Jun 04
Location: West Yorkshire
User status: Offline
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so nat catalytic bits in then ? explains why it sounds fookin evil then
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Siberia
Member
Registered: 9th Oct 03
Location: Leprechaun Land Drives : Zafira GSI
User status: Offline
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quote:
Originally posted by SRi-Co
so nat catalytic bits in then ? explains why it sounds fookin evil then
no cat? thats against the law isnt it....
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Rileysport
Member
Registered: 18th Jun 04
Location: West Yorkshire
User status: Offline
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i do have three kittens 
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Joff
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Registered: 17th Oct 00
Location: Cambridgeshire
User status: Offline
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quote:
Originally posted by Siberia
quote:
Originally posted by SRi-Co
so nat catalytic bits in then ? explains why it sounds fookin evil then
no cat? thats against the law isnt it....
It's the standard cat that came off my Sport. Nothing special.
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Rileysport
Member
Registered: 18th Jun 04
Location: West Yorkshire
User status: Offline
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i'm legal woohoo
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1600power
Member
Registered: 22nd Apr 04
Location: Shropshire Drives: 1.6 16v Sport
User status: Offline
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I've been experiencing this with my car aswell. When it went on the rolling road at a Vauxhall tuners it was very apparent that I had a flatspot around that rev range aswell and the guy that did it for me suggestted renewing HT leads, sparkplugs etc he didnt understand really why it was doing it mind so it could well be something else?
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James R
Member
Registered: 4th Feb 03
Location: 205GTi16/306GTi16
User status: Offline
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could check the timing, might be a tooth out making it run oddly in the midrange??
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Joff
Member
Registered: 17th Oct 00
Location: Cambridgeshire
User status: Offline
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Vauxhall's OE HT leads are pretty much lifetime leads. Check everything else - filter, plugs, etc.
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Siberia
Member
Registered: 9th Oct 03
Location: Leprechaun Land Drives : Zafira GSI
User status: Offline
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quote:
Originally posted by j1400
could check the timing, might be a tooth out making it run oddly in the midrange??
surely there would be more side affect though...
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James R
Member
Registered: 4th Feb 03
Location: 205GTi16/306GTi16
User status: Offline
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I'm not sure what you mean?? side effect, if the cam timing is out then the ecu will not cope very well.
Have you tried re-setting the ecu??
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