4age Ae111 Blacktop Flatspot

[lost247]

Hi My 4age 20v Blacktop has a bad flatspot between 2000&3000 rpm.
It feel like its blogging down and sort of stops accelerating. This mainly happens from a 1 to 2nd gear change.
I am just wondering if anybody else has this problem and has fixed it. Or any other suggestions.

Thanks.

[Matty104]

trust me mate its a headache to even think about it haha , mine has it and always bugd the shit out of me , theas quite a bit of info on here about it, but my only success with loosing a bit of it is more back pressure but that could just be me , or the fact that it powers through it a bit faster so not as noticible, i tend to try and bypass it tho by taking off a bit lighter and putting my foot rite down at about 5 grand


Matt

[gepsk8]

clean out ur tumpets, take off the inlet (and put it back on if u want run correctly, does sound ok but its all sound no go!) and clean each 1 out while motors running, with brake clean, always use 98+ gas, apart from that get aftermarket ecu tuned to our fuel as ur cars ecu wants 100 octane fuel.
or low ur compression.

[Cakky]

My opinion is that is has something to do with the petrol, lately mine hasn't been doing it, I always use 98 and all I can figure is that sometimes when it does happen is that its a bad batch of 98. I lent my dad my car two weeks ago and the knob put 95 in it and it ran really really crap had the flatspot until I drove it all out and refilled with 98 now its fine.

[frost]

^^^ yep thats what im thinking too, i was out of town and no BP so had to fill it with 95 and flat spot was more prominent, also i think grade of oil too because after an oil change 10/40 made it much better, but that could just be because its new oil

[Defective]

My opinion is that is has something to do with the petrol, lately mine hasn't been doing it, I always use 98 and all I can figure is that sometimes when it does happen is that its a bad batch of 98. I lent my dad my car two weeks ago and the knob put 95 in it and it ran really really crap had the flatspot until I drove it all out and refilled with 98 now its fine.

i only run mine on 95 (98 not available here) and i have no flat spot... maybe its just general tuning...

[AceSniper]

check your dizzy timming, clean the tb's, fit a catch tank

[Matty104]

i just fitted a catch tank like pic 2 in this forum

viewtopic.php?t=48498&highlight=catch

Havn't driven it to much yet but from the drive i took around the block it seemd to take the flatspot out a bit, and got a full 2 1/4" exaust system the other day and that took quite a bit of the flatspot away too,