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| The_Jackal |
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Bout 2 weeks ago i had some pacemaker 4480's and a hiflow cat fitted and now when accellerating i have a bit of a flat spot between 2k and 3.5k rpm
it never did it before. but the guy at the exhaust place said he's seen it before and resetting the computer fixes it, which it didnt. has anyone had this before, or know whats causing it and knows how to fix it?
_________________ EF XR8 - 5speed, Extractors & Exhaust |
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| EBXR8380 |
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Check 02 senser?? Did they silicone sealant ??
_________________ As in ZOOM 126 edition |
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| Disco Frank |
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and have u reset the ecu correctly?
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| The_Jackal |
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there no silicon on the o2 sensor.... how long do those sensors last???
yeah i reset the ecu correctly
_________________ EF XR8 - 5speed, Extractors & Exhaust |
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| TIKFORD |
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yeah i know exactly what your talking about, after i put on my 4480's i had that flat spot. ive reset the ecu and changed the oxy sensor and its still there.
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| fordgt290 |
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02 sensors can last a very long time. but usually after 80,000km or so they start to get a little "lazy" and take longer to react to a change. but usually ur ecu adapts to this, (adaptions) but replacing it can help.
as u canged ur exhaust this would have changed ur back pressure and this could have upset the motor, to cause the flat spot ur getting. or it could be something unrelated to the exhaust |
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| twr7cx |
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fordgt290 wrote: 02 sensors can last a very long time. but usually after 80,000km or so they start to get a little "lazy" and take longer to react to a change. but usually ur ecu adapts to this, (adaptions) but replacing it can help.
as u canged ur exhaust this would have changed ur back pressure and this could have upset the motor, to cause the flat spot ur getting. or it could be something unrelated to the exhaust hows the back pressure effect the motor? i mean when the valves open the motor'll be running more efficently as the increased flow will be helping to draw the gases out of the cylinder head, and when the valves closed the back pressure won't make any difference as the valves closed. |
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| sickd |
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twr7cx wrote: fordgt290 wrote: 02 sensors can last a very long time. but usually after 80,000km or so they start to get a little "lazy" and take longer to react to a change. but usually ur ecu adapts to this, (adaptions) but replacing it can help. as u canged ur exhaust this would have changed ur back pressure and this could have upset the motor, to cause the flat spot ur getting. or it could be something unrelated to the exhaust hows the back pressure effect the motor? i mean when the valves open the motor'll be running more efficently as the increased flow will be helping to draw the gases out of the cylinder head, and when the valves closed the back pressure won't make any difference as the valves closed. yes it will effect it because all cylinder exhaust port dont open and close at the same time the lack of pressure has freed the motor up alowing it to work easier but if your fuel is still the same as when it had more back pressure you will get flat spots were the fuel is to rich or lean and you notice it because you are gettin more fuel else were say higher in rev range were there is more fuel , and this is cause these motors run rich or it could be other problem but yes i have flat spot too after new system, nothing a turbo wont fix lol
_________________ BA XR8 BOSS 260
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| The_Jackal |
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hrmmm well at least im not the only one with the prob, ill have a look round on the weekend and check over everything.
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| Slick |
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left a hole so big the exhaust isn't moving fast enough out the tips, those big bore cats all useful for blown engines or only good at higher rev range.
eg: think of it as a veccum cleaner, attach a large diameter hose and it won't suck.
_________________ Mind f**k!!! it works on feeble minded ignorant sheeples... there's plenty of em on this site... some are very intelligent but by god they are so thick!!! Pakrat wrote: You can buy them seppertly
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| 1 SLY 97EL |
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Thats the problem I got now with too much flow now with Extractors, Cat and exhaust and I only notice any power gains above 3000Rpm like you said
_________________ " In life their is never an Obligation just an Opportunity to..Own an awesome 1970 Ford Mach 1 Mustang! " |
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| Slick |
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1 SLY 97EL wrote: Thats the problem I got now with too much flow now with Extractors, Cat and exhaust and I only notice any power gains above 3000Rpm like you said Have you got your old cat? I'll bet you when you weld it back on you'll claim back what you've lost between 2000-3000rpm.
you'll need to balance whats coming in throu CAI to creat vacum. and whats going out the rear, like a vortex effect. I too came across some flat spots back then, I worked it out by keeping everything in proportion with the engine capacity.
_________________ Mind f**k!!! it works on feeble minded ignorant sheeples... there's plenty of em on this site... some are very intelligent but by god they are so thick!!! Pakrat wrote: You can buy them seppertly
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| Dellboy999 |
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put a restrictor plate in between the cat and the exhuast at the oulet end, you what 2.5" so make a plate with a 2.25" hole in it, bolt it in-line and test the power.
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| Smackdown |
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When I put in my zorst, headers and cat I never had that problem. Although the cam went in about 2 weeks later...
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| falconea |
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I seem to remember Jim Mock saying you had to use smaller diam extractors to get the correct effect on these engines. And he has done a lot of diagnostic and developement work on the I6.
Not all extractors work well and some people would not know if the power was up or not they just think it is because they have extractors. When you change one thing you have to change others to compensate for the original change you made. Thats y not everybody can get power out of thier engines, its more complicated than most think. Extra power costs money, wether u like it or not u cannot get something for nothing
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