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(Post Link) post #1 of 24 Old 05-01-09 Thread Starter
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remap ecu advice

What sort of gains can i expect from a remap of the ecu in my 3.2 GT ?
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Re: remap ecu advice

+10 B H P ?
 
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Re: remap ecu advice

About ten brake top end, maybe as much as 20NM through the midrange.. Sharper throttle response, smoother torque curve, fewer flat spots.. Who is doing the remapping?
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Re: remap ecu advice

advice ? don't do it, not worth the trouble... if you really want more oomph you need other cams, larger injectors etc 250 bhp on the front wheels is about maximum....
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Re: remap ecu advice

well it already has 250bhp as standard and I have been in a 3.7 supercharged and it handles quite well, all be it I wasn't driving it though had about 370bhp at the time

its worth it for the gains of how it makes the engine act, not so much much on power gains
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Re: remap ecu advice

Add a CDA with the remap and then you'll feel some difference.
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(Post Link) post #7 of 24 Old 19-01-09 Thread Starter
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Re: remap ecu advice

CDA ? excuse my ignorance, what is a CDA
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Re: remap ecu advice

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CDA ? excuse my ignorance, what is a CDA
Carbon Dynamic Airbox - BMC CARBON DYNAMIC ARIBOX | AIR FILTERS | AIR FILTER | car - bike - high performance - racing

Replaces the standard airbox and air feed. I got a noticeable improvement when I fitted one on my remapped 156 JTD, and my current V6 came with one fitted by the previous owner. I took my one out a while ago and replaced it with a K&N cone, and use the bottom half of a 3.0 GTV airbox and air feed to make a shield and cold air feed for it, and it was no better than the CDA, in fact it did seem a bit weaker lower down in the rev range.

The CDA sounds great as well, a lovely induction roar when you are pressing on but silent as a mouse when driving steadily.. If you have a standard exhaust system still the induction noise will really stand out, you'll love it

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Re: remap ecu advice

I got my CDA and remap done last week and it really is worth it. You will gain drivebility at all revs, the engine is smoother, more torque at low revs and you can feel the pull at high revs now.

I didn't want something too loud and the CDA is perfect. Give 1/3 throttle and it's a normal everyday car but put your foot down then you can enjoy the music and extra umph.

Take a look at Angel Tuning. They will do both with a little discount. Plus if you do a remap and then later decide to go for the CDA or other induction system then as I understand you should do another remap.
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(Post Link) post #10 of 24 Old 20-01-09 Thread Starter
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Re: remap ecu advice

I changed the rear muffler on my GT3.2 to one less restrictive, and gave the car a nicer sound , not loud, but i noticed a drop in torque, so i put the standard unit back on and performed much better. My theory is it needs induction modification like the CDA as suggested + back muffler change and remapping after these mods are done ??????? Or leave it stock ??
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Re: remap ecu advice

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Originally Posted by Tassie Alfa View Post
I changed the rear muffler on my GT3.2 to one less restrictive, and gave the car a nicer sound , not loud, but i noticed a drop in torque, so i put the standard unit back on and performed much better. My theory is it needs induction modification like the CDA as suggested + back muffler change and remapping after these mods are done ??????? Or leave it stock ??
I think your case is quite unusual, I wouldn't have thought changing a rear muffler would make any difference whatsoever to power or torque at any revs. There are massive restrictions already in place in the manifolds, you have a cat in each one, and then either one or two under the car as well.. How can changing the rear muffler have such an effect when you already have much bigger restrictions closer to the engine? Its a shame the car wasn't rolling-roaded to measure any changes before and after..

Essentially though, the faster and smoother you can get air in and out, the better. Obviously a very short induction pipe and no restrictions is going to be great when the engine is gulping air in like no-one's business (7,000rpm), but no good at lower rpms, where you need a restriction in the volume of air flowing into the engine to increase the air's speed and thus aid the filling of the cylinders..
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Re: remap ecu advice

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Originally Posted by Tassie Alfa View Post
I changed the rear muffler on my GT3.2 to one less restrictive, and gave the car a nicer sound , not loud, but i noticed a drop in torque, so i put the standard unit back on and performed much better. My theory is it needs induction modification like the CDA as suggested + back muffler change and remapping after these mods are done ??????? Or leave it stock ??
You can get gains by replacing the silencers with straight throughs, but you can lose low down power as you move the torque/power curves right along the graph. You might need to reduce the diameter of the piping leading to and from the silencers by a quarter inch or so - that and some striaght through silencers moved my torque curve left and got me more power and torque. (NB As the car is naturally aspirated you shouldn't change the cats or anything forward of them like the manifold - unless someone has done precise backpressure calculations for you!)

Yes, for maximum gains you should do your exhaust and intake before remap. Or you could just do intake and remap. If you do exhaust later, that's fine but for best results you would remap again. Basically for an ideal set up you want to remap when all your physical changes are done.

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Re: remap ecu advice

[QUOTE=Pud237;2337991]I think your case is quite unusual, I wouldn't have thought changing a rear muffler would make any difference whatsoever to power or torque at any revs. There are massive restrictions already in place in the manifolds, you have a cat in each one, and then either one or two under the car as well.. How can changing the rear muffler have such an effect when you already have much bigger restrictions closer to the engine? {QUOTE]

Apparently on a naturally aspirated engine it is very important that the back pressue through the manifold is precisely calculated as it directly affects the motion of the cylinders. For that reason it's not a great idea to mod the manifold or cats (as the cats are close to the manifold), unless someones done a whole pile of calculations on the results. However, back from the cats, you can speed up the air flow with less restrictive silencers. The pressure in the manifold won't be too badly affected as the cats keep the pressure up - but you can still increase the flow of gas from the cat outwards.

Apparently this only applies for naturally aspirated engines and you may be able to do much more on turbos, where basically you want as much flow as possible I think (not sure if you need to worry so much about manifold pressure on these).
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Re: remap ecu advice

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Apparently on a naturally aspirated engine it is very important that the back pressue through the manifold is precisely calculated as it directly affects the motion of the cylinders. For that reason it's not a great idea to mod the manifold or cats (as the cats are close to the manifold), unless someones done a whole pile of calculations on the results. However, back from the cats, you can speed up the air flow with less restrictive silencers. The pressure in the manifold won't be too badly affected as the cats keep the pressure up - but you can still increase the flow of gas from the cat outwards.

Apparently this only applies for naturally aspirated engines and you may be able to do much more on turbos, where basically you want as much flow as possible I think (not sure if you need to worry so much about manifold pressure on these).
Yeah you do need a certain amount of backpressure, this 'pulls' exhaust gasses out of the cylinder, which in turn allows a better flow of air into the cylinders on the next intake stroke. Too much backpressure and the engine will be suffocated at higher revs (think torque-monster 5.7 Chevrolet V8 that only makes 170bhp), too little backpressure and its just like having no exhaust at all - the engine will struggle to idle smoothly, as exhaust gasses aren't flowing out of the cylinders as they should.

Best thing you can do is to try things though, to see what improvements can be had. I wouldn't worry too much about figures and calculations. My car is much smoother lower down in the rev range without the cat converter in, thats without any silencers either besides the backbox, and there are no cats in the manifold too. Power over 6,000rpm is much improved too. Doesn't feel as if its lost any torque either.
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(Post Link) post #15 of 24 Old 25-01-09 Thread Starter
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Re: remap ecu advice

My real toy is a ground up custom "Harley" pro one type chopper . Built it a few years ago and continually playing with carbs and exhaust baffles. Did most of the work myself , but it is a very basic machine compared to the Alfa. Mind you with a 124 cube motor in it the Alfa doesnt get close. I found with the exhaust modifications on my bike running different motors, the exhaust has to be designed to suit the motor ,ie cams and carby sizes. I guess the same principle applies to the Alfa. Some of you guys that have threaded would find this web site of interest ...Rich Barrett Racing Explains effects different exhaust designs have on torque and hp . They also have a warped scense of humor
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Re: remap ecu advice

Tassie Alfa, what brand of exhaust did you buy?
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Re: remap ecu advice

Only the rear muffler, R3 Racing made here in OZ. One in and two out all nice stainless. Running the standard muffler again though
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Re: remap ecu advice

What a pity, that is why well known European brands are better as they have both the experience and a dyno to make sure at the least you are not worse off.
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Re: remap ecu advice

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Originally Posted by ASG GTV View Post
Add a CDA with the remap and then you'll feel some difference.
Adding a CDA might loose power. The CDA only works when being made part of an induction.
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Re: remap ecu advice

Does anyone know the differences between the GT 3.2 and the GTA 3.2?

As the GTA is 250bhp and the GT is 240bhp. Whats different and why?
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Re: remap ecu advice

they have exactly the same engine, but the mapping is different.

So if I had a 3.2 GT/GTV/166 I'd definately get the remap done as in this particular case +20hp should be expected, as you'd expect at least a +10hp gain for a 250hp GTA
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Re: remap ecu advice

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Originally Posted by andy9841 View Post
Does anyone know the differences between the GT 3.2 and the GTA 3.2?

As the GTA is 250bhp and the GT is 240bhp. Whats different and why?
as for why, there is much speculation! - that it's marketing to elevate the GTAs above the other models performance wise, or that the map was just designed in such a way that you get more torque low down than you do on a GTA but less top end power
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Re: remap ecu advice

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Originally Posted by CPH View Post
Adding a CDA might loose power. The CDA only works when being made part of an induction.
I'll refrase it then: add a CDA induction kit.
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Re: remap ecu advice

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Originally Posted by phil-gtv6 View Post
they have exactly the same engine, but the mapping is different.

So if I had a 3.2 GT/GTV/166 I'd definately get the remap done as in this particular case +20hp should be expected, as you'd expect at least a +10hp gain for a 250hp GTA
Engine and cams are the same, but the exhaust system in the GT is different to that in a 156 GTA. However, the 147 GTA exhaust system is different again, and so is the one in the 166 3.2 V6 and the GTV 3.2 V6.

Oh, and the standard induction set-ups are different too.

But give each engine the same aftermarket exhaust and induction set-ups, and the same remap, they should make the same power - manufacturing tolerances aside.

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