pros and cons of afm removal
Discussion
No strictly true, there are upsides if you move to an ECU that gives you mapped ignition in addition to fueling as part of removing the meter. The meter is also a restriction in the induction path. A downside is without the meter in the side, the fueling is not as accurate and the meter provides automatic compensation for changes in the condition of the engine as the mileage racks up.
Steve.
Steve.
Edited by Steve_T on Thursday 16th August 14:31
dont agree with that one Steve,the other benefits will blow any advantages of the AFM if any into the weeds,and as for compensating for engine wear thats debatable also
Sorry Dave & Steve cant see your opinion,the benefits are not worth mention over an aftermarket ECU fact,actually i cant believe were having this discussion the differences are mammoth beetween both systems and *uck the AFM benefits
we are talking about an old school pushrod motor not a variable valve timing screamer that does 40MPG.
we are talking about an old school pushrod motor not a variable valve timing screamer that does 40MPG.Edited by That Daddy on Thursday 16th August 14:57
Lets be a bit more specific then. I'm talking about wear which reduces the amount of air that the engine can pump. If the cam wears and as a result the valve lift reduces, an AFM will pick this up. Throttle angle mapping can't handle this. What about barometric pressure variation - again the AFM will handle this. You need to do it another way when you go throttle angle mapped, but of course it can be. I agree with you that none of these points are big things, but the original poster wanted both sides. The key advantage to me is mapped ignition, but what are all the other points you allude to?
Steve.
Steve.
Edited by Steve_T on Thursday 16th August 15:02
Right so, Steve are you saying you would go to the expense of fitting an aftermarket ECU (Emerald for example) to a worn engine,apart from the cam wear issues do you know how many miles approx before the RV8 shows enough wear to warrant the benefits of the AFM system,i can give you an idea bloody loads,blimey you lot make me wonder sometimes
Jay as asked a sensible question and you will give him doubts after reading this tosh.
Jay as asked a sensible question and you will give him doubts after reading this tosh.Jeez mate chill out. It's the OP's call and he wanted to make an informed choice. There are upsides to the Emerald path and I've not said otherwise, but it does sound like you just don't want to hear that there might be another point of view.
OP, in your position I would think about how much the whole thing will cost and who will look after your car once it's been modded. Obviously once you've done the mods you may close some doors in the TVR world, because you can't use standard diagnostics, but on the flipside you may open others to Emerald specialists. If you can, go find yourself someone with the mods done, who has lived with their car for a while after and will tell you all of their experiences. Emerald themselves seem to support their product well, so I'm sure you can find any help you may need.
Steve.
Edit: OP, I see you have a 4.0 Chim. If you want more poke, another choice is to sell yours and buy a 4.5 or 5.0.
OP, in your position I would think about how much the whole thing will cost and who will look after your car once it's been modded. Obviously once you've done the mods you may close some doors in the TVR world, because you can't use standard diagnostics, but on the flipside you may open others to Emerald specialists. If you can, go find yourself someone with the mods done, who has lived with their car for a while after and will tell you all of their experiences. Emerald themselves seem to support their product well, so I'm sure you can find any help you may need.
Steve.
Edit: OP, I see you have a 4.0 Chim. If you want more poke, another choice is to sell yours and buy a 4.5 or 5.0.
Edited by Steve_T on Thursday 16th August 15:18
Steve will the 4.5/5.0 give me a bigger penis thenI ran my 4ltr chim on the road for a good few years with an emerald and no afm. It was a company car at the time so used most days on longish journey's Mine didnt even have a idle control valve fitted.
the only noticable differences were a little hunting at idle ( due the the ramp inthe map to take account of no idle ctrl valve) and if you stalled it just after starting it it would restart, unlike with the old lucas where it overfuelled on cold idle and if you stalled it inthe first ew mis whilst manouvering it would flood.
I dont think putting an emerald on closes any doors to tuning, as all you need to program the emerald is a pc and the software from the internet. which all the guys will have..
The main advantages of the emerald are
a) mappable ignition
b) very easy to adjust for further engine mods. especially with the latest ecu and self mapping via wideband lambda.
go for it
G
the only noticable differences were a little hunting at idle ( due the the ramp inthe map to take account of no idle ctrl valve) and if you stalled it just after starting it it would restart, unlike with the old lucas where it overfuelled on cold idle and if you stalled it inthe first ew mis whilst manouvering it would flood.
I dont think putting an emerald on closes any doors to tuning, as all you need to program the emerald is a pc and the software from the internet. which all the guys will have..
The main advantages of the emerald are
a) mappable ignition
b) very easy to adjust for further engine mods. especially with the latest ecu and self mapping via wideband lambda.
go for it
G
Steve_T said:
You old charmer Daddy 
I know,i know,sorry Steve misread post you were referring to the OP, Doh that will teach me.Spot on Gavin/ihatesissycars, nice 2.0s by the way,although i have a feeling its not stock,apart from the wheels of course
Edited by That Daddy on Thursday 16th August 16:31
That Daddy said:
Steve_T said:
You old charmer Daddy
I know,i know,sorry Steve misread post you were referring to the OP, Doh that will teach me.Spot on Gavin/ihatesissycars, nice 2.0s by the way,although i have a feeling its not stock,apart from the wheels of courseEdited by That Daddy on Thursday 16th August 16:31
That Daddy said:
Right so, Steve are you saying you would go to the expense of fitting an aftermarket ECU (Emerald for example) to a worn engine,apart from the cam wear issues do you know how many miles approx before the RV8 shows enough wear to warrant the benefits of the AFM system,i can give you an idea bloody loads,blimey you lot make me wonder sometimesJay as asked a sensible question and you will give him doubts after reading this tosh.
This is a fair post. I could never see the merit in the old argument that the AFM would compensate for a worn engine, talk about curing the symptom and not the cause .. if you have a worn engine sort the engine for crying out loud. sheesh! Jay as asked a sensible question and you will give him doubts after reading this tosh.Most other argiments for the lucas/afm are insignificant when compared to the massive benefits of going fully mapped, plus you lose that AFM restriction and the added complication of only being able to be mapped by a few people nationwide.
Go aftermarket, you'll not regret it.
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