Chip for 300C
- Thread starter NVP
- Start date
I agree with you but it's purely down to driving style. If you drive for economy, you will see better MPG. If you drive for pleasure, you will see worse MPG.
Even remapped HGVs can produce better economy, albeit 1MPG but it makes all the difference when they do about, er, 8MPG normally?
Danger to the manifold, blow the welds on the intake etc etc, now thats over with 
If you go down the piggyback ECU route with a chip its just going to be fighting with the maps on the stock ecu and the check engine light will stay on.
If you can remap the stock ecu this imo is the best option but takes a while and testing.
The proformance gains from remapping alone as a rule of thumb are roughly:
Petrol N/A 10-15% BHP and up to 20% torque
Petrol T 20-30% BHP and up to 25% torque
Diesel T 30-50% BHP and 60-75% torque
As you can see the diesels will gain the most as they are detuned with a 'catch all' map, but with remapping to get it running the best it can you are going to needing servicing more reguarly in some cases about twice because of the increased stress.
If you go down the piggyback ECU route with a chip its just going to be fighting with the maps on the stock ecu and the check engine light will stay on.If you can remap the stock ecu this imo is the best option but takes a while and testing.
The proformance gains from remapping alone as a rule of thumb are roughly:
Petrol N/A 10-15% BHP and up to 20% torque
Petrol T 20-30% BHP and up to 25% torque
Diesel T 30-50% BHP and 60-75% torque
As you can see the diesels will gain the most as they are detuned with a 'catch all' map, but with remapping to get it running the best it can you are going to needing servicing more reguarly in some cases about twice because of the increased stress.
Danger to the manifold, blow the welds on the intake etc etc, now thats over with
If you can remap the stock ecu this imo is the best option but takes a while and testing.
The proformance gains from remapping alone as a rule of thumb are roughly:
Petrol N/A 10-15% BHP and up to 20% torque
Petrol T 20-30% BHP and up to 25% torque
Diesel T 30-50% BHP and 60-75% torque
As you can see the diesels will gain the most as they are detuned with a 'catch all' map, but with remapping to get it running the best it can you are going to needing servicing more reguarly in some cases about twice because of the increased stress.
I don't know where those figures have come from but it totally depends on each engine. I would say turbocharged petrol and diesel engines remap about the same, you get a bit more out of a diesel maybe but I don't think I've ever seen a 75% increase in torque
I'd also say 20% torque and 10%-15% on a N/A is pretty optimistic, without breathing mods and other stuff you generally get tiny gains out of them.
Ball park figures like those might work on a certain engine, say the x35i or x35d but to say all turbocharged petrol, diesel and N/A engines will react in roughly the same way is pushing it a bit.
Try getting an extra 70% torque out of the massive Audi TDI's and you would have enough to start a black hole
But I agree, custom remap is really the way you should go unless for some reason you can't (ODB can't be read or no tuners in your country etc...).
Caporegime
- Joined
- 11 Mar 2005
- Posts
- 32,224
- Location
- Leafy Cheshire
Which car will do this?
seconded
its simply wrong to make broad sweeping statements such as this.
Heck the ECU varies wildly just between the Astra and the Vectra, let alone amongst every car currently on sale in the UK
ECUs all behave differently.
Caporegime
- Joined
- 11 Mar 2005
- Posts
- 32,224
- Location
- Leafy Cheshire
Provided that the tuning box is smart enough so the ecu doesn't see a boost overpressure or the MAF reports too much air then you should see no such lights, this DTUK box may keep the boost pressure below the Vauxhall max boost fault trip anyways, an e-bay cheapo box might however.
And for reference my MX-5 with piggyback management never flashed up a fault code.
And for reference my MX-5 with piggyback management never flashed up a fault code.
The manual which came with the CRD module says the module itself has fine tuning jumpers which can be used to increase/decrease the performance by 10% steps up to 30% each way. This is just in case the power I too low or high.
For too high it says it is "shown by strong soot generation, disturbed engine run, engine misfires or the initiation of the engine emergency program." It goes on to say that when the emergency program is initiated the vehical drives with a strongly decreased performance and in such cases some vehical models "Malfunction Indication Light (MIL) flashes".
It also says that "A fine tune is normally not necessary, since the CRD module was balanced and programmed for the respective vehicle. Before a change is made, you should contact your salesman or the manufacturer of the system. A technician will gladly help you."
Then it goes on to show you how you have to set the jumpers to get the increased/decreased performance percentages and blah blah...
For too high it says it is "shown by strong soot generation, disturbed engine run, engine misfires or the initiation of the engine emergency program." It goes on to say that when the emergency program is initiated the vehical drives with a strongly decreased performance and in such cases some vehical models "Malfunction Indication Light (MIL) flashes".
It also says that "A fine tune is normally not necessary, since the CRD module was balanced and programmed for the respective vehicle. Before a change is made, you should contact your salesman or the manufacturer of the system. A technician will gladly help you."
Then it goes on to show you how you have to set the jumpers to get the increased/decreased performance percentages and blah blah...
I know it's very late, but the first two pages of this thread.. so far my favorite stuff this year. "Yaris turbo would beat whatever youve got" and "0-62 in 8.5 secs from Yaris shuts everyone up" not to mention vtec box for diesel Chrysler calls for trademark and syndication to bumper sticker manufacturers. Five stars. Would read again.
Sorry it was a rather sweeping statement, I have seen it happen in the same car as I have, colt. And seen reports in a few others from discussions on the openecu forum.
I agree it defiantly does depend upon the engine and obviously the better performance cars the better tuned they are going to be as stock. Those numbers are very ballpark and where more to illustrate the ratios of improvement between types. The numbers came from a ECU tuning service website so probably a bit of marketing there
Heh I'l just do and sit over here
I agree it defiantly does depend upon the engine and obviously the better performance cars the better tuned they are going to be as stock. Those numbers are very ballpark and where more to illustrate the ratios of improvement between types. The numbers came from a ECU tuning service website so probably a bit of marketing there
Heh I'l just do and sit over here
Last edited:
Sorry it was a rather sweeping statement, I have seen it happen in the same car as I have, colt. And seen reports in a few others from discussions on the openecu forum.
I agree it defiantly does depend upon the engine and obviously the better performance cars the better tuned they are going to be as stock. Those numbers are very ballpark and where more to illustrate the ratios of improvement between types. The numbers came from a ECU tuning service website so probably a bit of marketing there
Heh I'l just do and sit over here
nobody is trying to put you down
but its unfair to make a post that comes across as "your car will do xyz".
Instead a post that says "it might do XYZ as it did with my colt, are you sure you've got your facts straight that it wont do it?" is much less alarmist
Soldato
- Joined
- 29 Jul 2004
- Posts
- 7,141
It's a Yaris, what's there to like?
Here's an update on the DTUK® CRD-T - 2 Channel Common Rail and Turbo Boost System if anyone is interested.
After almost a week and a half of doing around 110+ miles every weekday and with both me and my dad driving as we usually would (me quite "enthusiastically" and my dad very efficiently) I can confirm that the chip does raise fuel economy by approx 3mpg.
With my Dad driving 50 odd miles in the morning traffic at his usual slow pace and me driving the same 50 odd miles at my usual "slightly faster" pace in evening traffic we used to average ~25mpg and now we avg ~28mpg, not a huge increase but with the amount of distance we travel any increase is welcomed.
The performance itself has been greatly improved, the car feels much more responsive, the sluggish start when the pedal is pressed is now minimal, I think the turbo kicks in much sooner than before. The car now feels much nicer, all my initial criticisms of it's performance have been addressed as it is much smoother and the lag is down to a minimum rather than an eternity.
I would say the economy increase comes from the fact that you no longer have to mash your foot down to get any acceleration going by how laggy the response was before compared to how it is now.
After almost a week and a half of doing around 110+ miles every weekday and with both me and my dad driving as we usually would (me quite "enthusiastically" and my dad very efficiently) I can confirm that the chip does raise fuel economy by approx 3mpg.
With my Dad driving 50 odd miles in the morning traffic at his usual slow pace and me driving the same 50 odd miles at my usual "slightly faster" pace in evening traffic we used to average ~25mpg and now we avg ~28mpg, not a huge increase but with the amount of distance we travel any increase is welcomed.
The performance itself has been greatly improved, the car feels much more responsive, the sluggish start when the pedal is pressed is now minimal, I think the turbo kicks in much sooner than before. The car now feels much nicer, all my initial criticisms of it's performance have been addressed as it is much smoother and the lag is down to a minimum rather than an eternity.
I would say the economy increase comes from the fact that you no longer have to mash your foot down to get any acceleration going by how laggy the response was before compared to how it is now.