Thread: Rover V8 advance maps

If I can find my old haltech map I will send it.

Interesting your speak about Spark advance curves ! The advance curve is actually determined by the VE % , dynamic compression (overlap) ratio and fuel type . I run a 450 hp engine at a Max of 28 degrees all in by 2900 RPM ,(ULP98) static comp 11.9:1 , (108 % VE peak at 4800) Vacuum advance is just for cruise and as you have said, doesnt do much above around 10% demand/load.

i run lpg in a 4.6 HC so not much help to you (i've found there is a large difference between the timing curves for petrol and lpg though i only play with lpg and no dyno - there isn't a four wheel dyno in hobart). i found this article a few months ago which mirrors some of the comments i've seen in your posts regarding ported/non ported vacuum advance and emissions control. might provide some useful info to others out there on the topic.

I missed this thread originally. I have played with my advance over and over on my haltech chipped rangie.
I dont have the vacuum advance connected, all advance adjustments are in my software.

I have slowly upped the advance through out the load points, yet to have got a proper tune and it has been a while since I played around with it.

I can say I have added a good amount of advance all the way through the rev rangie. Even at higher load points (80% high revs for eg.).

My dizzy advance at idle is sitting around 10-12degree (got some play in my timing chain aswell). I have upto 14 degrees added at coast (0% load) and at approx 50% load I have a point adding 8 degrees (at higher revs).

This last map absolutely blows the older less advanced maps I had out of the water!

So far all I can add to this is the rover V8 loves advance. But too much and you will get pinking when under constant load (heat soak).
This has happened to me once when I was heading back at speed through very soft sand towing 1.2ton of camper trailer with 37" tyres and standard gearing.

I have some of my old maps listed on this site in my mebers thread, I shall try and find them, but I currently can not access any of my older maps as I broke my laptop.

Wish you were up this way Philip as I would love to sit down for a chat and gain some of your knowledge. So far I have been self taught and only god knows how much benefit/damage I could be doing

let me know if you can view this post in the GCLRO members section Philip.
http://www.aulro.com/afvb/gclro-memb...ml#post1068290


If you can you can see the link, this is my oroginal map when I received the vehicle from graeme Coopers.
It was running approx 6-7degrees at idle.

There are some more maps following this thread that I toiled with while learning, including the last one on the next page, its a basic map to give me an idea on how forgiving the timing can be.

The current maps are totally different again, will upload the current one this afternoon.
Also ordered a tornado chip from RPi last week that will be arriving shortly. I am looking to fine tune my Ignition map to suit the tornado, but again this will be another 8 hours plus of changes and test runs
Keen to compare the performance difference with the tornado compared to my current fuel map aswell.

This has to be my favourite topic of late. Love mucking about with the software maps.

Grimace , sorry cannot access the maps. Could you PM them to me or email/
Regards Philip A
PS I will be interested to see what effect the Tornado chip has!

i have a few advance maps i have used on my megasquirted v8, if you are interested i can post them up

they are vacuum (kpa) x rpm maps, mostly 12x12 points but one is 10x10 i think, possibly 8x8

i am yet to find one i am happy with, but us megasquirted types are always nitpicking haha

Ok here is my maps.

FIRST UP THE ORIGINAL MAPS FROM GREAME COOPER



As you can see these maps are quite rough, this setup had good highway economy and a bit of power in the mid range. Down low it was ordinary as well as at the top end.
The base advance at the dissy with this map was originally 6BTDC, I got slightly better performance when I bumped it upto 8BTDC
The maximum advance (software) with this map was only 6degrees (IMHO that's no where near enough)

SECOND IS MY ATTEMPT AT SMOOTHING OUT THE MAPS



You can see at this stage I still wasnt aware of the amount of vacuum available from the standard vac advance so I kept the max software advance to 6degrees.
I added a touch more advance down low and smoothed the lot out.
As for fueling I minimised some of the adjustmenst at cruise and low throttle.
The base idle was originally @ 8BTDC, then I bumped it up to 12BTDC.

This entire map seem to be inconsistent, I think I lost power at times and the only improvement I think I found was right at the top end.

By this stage I thought it was all in my head so I started researching more and then came up with a radicle map to test my theorys.

SO THE THIRD MAP WAS A COMPLETE OVERHAUL



This is very liniarised, I dropped the base advance back down to 6BTDC.
Added **** load of software advance in the safest possible mappin (to my knowledge).
I took out fuel down low and added a bucket load up top.
While this was just a big test of my knowledge at the time, I did notice some improvements. The car felt like it had an extra cylinder at times.

I did many variations to the above maps but unfortunately I did not post them in my members thread. So there are suck on the broken laptop.

I did up the base advance to 12BTDC again and still used a rather heavy software advance.

I went to fraser and experienced my first example of heat soak and engine pinking.

LAST UP THE CURRENT MAPS



These show the adjustments that I made, by this stage I had changed the load points and the rpm intercept points and done a load of driving tests, along with numerous AFM and even TPS adjustments.

The car now drives better through out the rev range, it has a heap of balls down low and plenty of poke up top.
Exhaust note is also noticably crisper and deeper at stages through out the rev range.

If I had to guestimate the power output I would say it would easily be another 20hp over the original configuration. It's more then any improvment I have got out of an exhaust for example.
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Now it doesn't end here (and probably never will), cause although I have plenty of power between 1500-2000rpm, I think it can be improved more in the range between 1000-1500rpm. I also have fitted an adustable fuel presure regulator and set at 40psi it has made a difference.

I think I need to introduce more idle advance, so base+software advance is closer to the 20degrees, I also think I can put more fuel in her (more so at the mid-top end) and up the fuel presure.

I havnt done any of the above due to 1. being scared and 2. not having enough feedback from my current setup.

I have a vacuum gauge, and A/F gauge to install aswell as the Tornado chip. Then I have the cam and timing chain to be replaced.
Then if I am feeling lucky I might shout myself a set of knock ears.
Regardless until I have the guages installed I am not goin to learn any more about my particular engine.

I have also had a few other ideas swim through my mind, such as replumbing the vac advance and using smaller changes to the software advance. But again I got scared of overcomplicating things and thought I would wait till I had a better grasp on the art of tuning.

I hope the above maps illustrate just how much advance a rover v8 such as mine can take.
I in no way consider myself an expert in this department, all this is self taught with many hours of readng and the same hours put in driving the vehicle to test real world driving changes.

I think in the perfect world (if I were a genius lets say), that you could extract a fair amount more power out of the engine in just fuel and ignition maps alone.

I'd be interested in placing it on a dyno to get an idea of power output now and a A/F ratio of the entire setup. Be interesting to see if its all in my head

Cheers
Grimace