A new option to map the lucas fuel injection system
Discussion
Some of you may have seen this post;http://www.pistonheads.com/gassing/topic.asp?h=0&f=9&t=1325176&mid=176949&nmt=Instructions+to+change+fuel+maps+on+14CUX+Griffith%2C+Chimaera
I have been watching it with interest, particularly after I had my current car on the rolling road in October and watched the poor fueling go horribly lean, just before the operator stopped the power run!
People visit rolling roads for different reasons and I wanted to see what was happening under load. The 5.3 car didn't feel any faster than my 400 (apart from top gear torque) and using data logging on rover gauge, I could see that the car was going regularly outside of maximum correction tolerances but I didn't know by how much.
On the rollers, the power was all done by 4500/4600 revs and was running in the 14-16 range under load. Max power was still 303 and 360 lb of torque, so lots of room for improvement!
I thought about changing to an aftermarket ECU but decided against that and three separate routes of recommendation came together and I ended speaking with Jools (spitfireV8) late last year. We discussed the project in the post above, what I wanted from the car and agreed February would be a good time for both us to do the remap.
By then, Jools would have tried a few more things out on different cars and I would have changed the bits I wanted to up-grade (Clive F y piece, pre-cats etc)
I picked the car up yesterday and it is literally like a different car. The power is amazing and it revs up in a similar way to my 400 - very fast pick-up and a lovely noise!
Although the max power is only 23 more, the power curve starts earlier and last longer. 326hp 5400-5800 revs and 365 lb of torque, with 330 lb from 2000 revs to the max!
Jools is a great guy to deal with and as commercial customer number 1 for this new service, I am delighted I chose to stick with the lucas system and also, to have him do the work.
If you use Rover gauge and can see the trim going out of range or always on the extremes, I would definitely not hesitate in getting in touch with him.
It is not a while you wait service. He does the power runs, then the dyno mapping, then runs the car around on the road, to check and refine all of the settings.
Driving back and not sparing my enjoyment of the new found power, I got 27 MPG as well which was a bonus!
The inevitable question is how much, but I think its best you speak with Jools about that if you have any interest in having it done. You will hopefully be pleasantly surprised.
Thanks Jools!
I have been watching it with interest, particularly after I had my current car on the rolling road in October and watched the poor fueling go horribly lean, just before the operator stopped the power run!
People visit rolling roads for different reasons and I wanted to see what was happening under load. The 5.3 car didn't feel any faster than my 400 (apart from top gear torque) and using data logging on rover gauge, I could see that the car was going regularly outside of maximum correction tolerances but I didn't know by how much.
On the rollers, the power was all done by 4500/4600 revs and was running in the 14-16 range under load. Max power was still 303 and 360 lb of torque, so lots of room for improvement!
I thought about changing to an aftermarket ECU but decided against that and three separate routes of recommendation came together and I ended speaking with Jools (spitfireV8) late last year. We discussed the project in the post above, what I wanted from the car and agreed February would be a good time for both us to do the remap.
By then, Jools would have tried a few more things out on different cars and I would have changed the bits I wanted to up-grade (Clive F y piece, pre-cats etc)
I picked the car up yesterday and it is literally like a different car. The power is amazing and it revs up in a similar way to my 400 - very fast pick-up and a lovely noise!
Although the max power is only 23 more, the power curve starts earlier and last longer. 326hp 5400-5800 revs and 365 lb of torque, with 330 lb from 2000 revs to the max!
Jools is a great guy to deal with and as commercial customer number 1 for this new service, I am delighted I chose to stick with the lucas system and also, to have him do the work.
If you use Rover gauge and can see the trim going out of range or always on the extremes, I would definitely not hesitate in getting in touch with him.
It is not a while you wait service. He does the power runs, then the dyno mapping, then runs the car around on the road, to check and refine all of the settings.
Driving back and not sparing my enjoyment of the new found power, I got 27 MPG as well which was a bonus!
The inevitable question is how much, but I think its best you speak with Jools about that if you have any interest in having it done. You will hopefully be pleasantly surprised.
Thanks Jools!
phazed said:
Don't forget, this engine isn't a fully na tuned monster.
It was built for drivability with modest heads, single plenum etc..
Well done Graham, I bet it drives really nicely.
Slightly different from my average 15 mpg
Thanks Pete, it does drive nicely! I am very happy with the car! Track day soon and I will let you know about the driving limits day when I get my act together during the week.It was built for drivability with modest heads, single plenum etc..
Well done Graham, I bet it drives really nicely.
Slightly different from my average 15 mpg
Jools,
Are you achieving the better mpg by re-mapping the light load section of the fuel table for economy? Do you re-map the entire fuel table, all 8 x 16 cells to get the best of both worlds, economy for cruising and max power when you demand it? If so I now really understand why you need your runtime chip programmer.
Are you achieving the better mpg by re-mapping the light load section of the fuel table for economy? Do you re-map the entire fuel table, all 8 x 16 cells to get the best of both worlds, economy for cruising and max power when you demand it? If so I now really understand why you need your runtime chip programmer.
The ecu on the later cars will trim back to lambda=1 regardless of what fuel numbers you put in (within reason) so in that respect there's nothing to improve economy I don't think other than reducing acceleration richening to the least required, cold start trimming etc. However the whole map is re-written to get the ecu trimming as low as possible, ie it's then starting with a map very close to optimal so the lambda trimming thereafter is minimised. Outside of lambda control you can put the fuelling where you want it of course but the lucas does seem to hold onto lambda control until the throttle is well buried into the carpet. You can watch the changeover from lambda control closed loop to open loop in rovergauge on the lambda trimming bar graphs.
I have three screens active when mapping .. tunerpro for live map changes and rovergauge to see exactly what trimming is being applied at any given time and what cell of the fuel map is being used, and the dyno screen of course.
I have three screens active when mapping .. tunerpro for live map changes and rovergauge to see exactly what trimming is being applied at any given time and what cell of the fuel map is being used, and the dyno screen of course.
TV8 said:
QBee said:
Was the work all on the ECU? What injectors and plenum are you using?
Hi Anthony,I went with the Bosche red injectors, 20AM, 71mm Plenum and ACT Carbon trumpets.
I back up what you have done - my 300.1bhp (
) and 330 torques make my car a lovely driving machine - yours will be similar, just more so. Glad Jules has sorted your car for you, as he is near me if I have any more issuesGassing Station | Chimaera | Top of Page | What's New | My Stuff