ignition map

[Meatball]

Has anyone got a 4.6 or 5.0 ignition map they could post up?
Thanks

[v8 racing]

Meatball said:

Has anyone got a 4.6 or 5.0 ignition map they could post up?
Thanks

By all means post yours up and will give my advice.

[v8 racing]

ps sorry i meant to say, what cam, heads etc do you have?

[Meatball]

Hi Rob, your stealth cam and skimmed stage 3 maybe 4 big valve heads (done by Jamie at CRE)
Its a 450 Chim
Cheers



Uploaded with ImageShack.us

[v8 racing]

Meatball said:

Hi Rob, your stealth cam and skimmed stage 3 maybe 4 big valve heads (done by Jamie at CRE)
Its a 450 Chim
Cheers



Uploaded with ImageShack.us

Hmm big room for improvement on the driveabillity on that map, have you actually had it done on the rollers at all? you should be up around the 45deg on light throttle cruise where you only have 26, i will send you one of my maps through but it wont be till next week sorry.

[Meatball]

v8 racing said:

Hmm big room for improvement on the driveabillity on that map, have you actually had it done on the rollers at all? you should be up around the 45deg on light throttle cruise where you only have 26, i will send you one of my maps through but it wont be till next week sorry.

Thanks Rob thats good of you, yes it was set on the rollers it made 291bhp at the wheels or 318bhp??? at the fly wheel, drivaillitys not too bad although it does still have a big shunt at 2000rpm i ran out of time on the rollers to sort it out.
cheers
Ben

[v8 racing]

Meatball said:

Thanks Rob thats good of you, yes it was set on the rollers it made 291bhp at the wheels or 318bhp??? at the fly wheel, drivaillitys not too bad although it does still have a big shunt at 2000rpm i ran out of time on the rollers to sort it out.
cheers
Ben

you havent got any where near enough advane at 2000 rpm, outright horsepower you wont gain anything, but your rollers are a bit mean on the losses!

[Meatball]

v8 racing said:

you havent got any where near enough advane at 2000 rpm, outright horsepower you wont gain anything, but your rollers are a bit mean on the losses!

i know i was expecting to make at least 330 bhp, how much advance at 2000rpm should i try?

[v8 racing]

Meatball said:

i know i was expecting to make at least 330 bhp, how much advance at 2000rpm should i try?

you should be up around 40-45 degress around the 2000-4000 light throttle, your wide open throttle looks a bit high at low rpm as well so be carefull with detonation

[Meatball]

I had a tinker with the advance over the weekend as you suggested and it has helped with the smoothness I'm not 100% convinced my altered maps correct so ill keep an eye out for your email

[macdeb]

Talking of which, ROB, I've since changed my plenum for one with a larger throttle and since my tickover is all to cock, any ideas? Mac.
PS Sorry Ben.

[Meatball]

macdeb said:

Talking of which, ROB, I've since changed my plenum for one with a larger throttle and since my tickover is all to cock, any ideas? Mac.

Mac What size have you gone too? my twins a real bd under 2000rpm

[macdeb]

Ben, just to 71mm, a real pig when slowing down and waiting at lights etc as having to constantly roll foot between brake and throttle. Above 1200 it's ok. What twin did you go for?

[Meatball]

macdeb said:

Ben, just to 71mm, a real pig when slowing down and waiting at lights etc as having to constantly roll foot between brake and throttle. Above 1200 it's ok. What twin did you go for?

The wrong one an old vittesse 2 x 68mm it must be a small air leak on mine as it sits at 1400rpm with the same symptoms as yours, im hoping to get around it with the MS spark advance.
Is your intermediate? as it could be the stepper control on the squirt?

[v8 racing]

Meatball said:

macdeb said:

Talking of which, ROB, I've since changed my plenum for one with a larger throttle and since my tickover is all to cock, any ideas? Mac.

Mac What size have you gone too? my twins a real bd under 2000rpm

Ben sorry i just havent had the time to sort it out for you, not enough hours in the day, i think i need to put my prices up to relieve some work!, i havent really had anything to do with your engine or ms, i have just noticed you have a twin plenum, one of the biggest problems with these is yhe throttle pot reads off the slave butterfly, so you can open the throttle on light throttle position to allow more air in but the throttle pot doesnt register, are you far away from me to have a look?,
Mac have you reset the throttle positon, if your throttle pot is a few figures out it will cause havoc?

[Meatball]

v8 racing said:

Ben sorry i just havent had the time to sort it out for you, not enough hours in the day, i think i need to put my prices up to relieve some work!, i havent really had anything to do with your engine or ms, i have just noticed you have a twin plenum, one of the biggest problems with these is yhe throttle pot reads off the slave butterfly, so you can open the throttle on light throttle position to allow more air in but the throttle pot doesnt register, are you far away from me to have a look?,
Mac have you reset the throttle positon, if your throttle pot is a few figures out it will cause havoc?

I would love to bring it down to you rob but im a million miles away from you in sunny devon, im using an after market throttle pot, but as you mentioned the second butterflys slightly lazy...(pennys dropped)
Have you managed to get around this before? Last year i spoke to John Eales about the old centre pull he used to make but it was silly money to get a one off made.

[macdeb]

v8 racing said:

Mac have you reset the throttle positon, if your throttle pot is a few figures out it will cause havoc?

Ahh, doh I'll get on to it, cheers bloke

[macdeb]

Meatball said:

could be the stepper control on the squirt?

Steppers by-passed, Gonna try Robs' idea, good luck mate.

[v8 racing]

Meatball said:

v8 racing said:

Ben sorry i just havent had the time to sort it out for you, not enough hours in the day, i think i need to put my prices up to relieve some work!, i havent really had anything to do with your engine or ms, i have just noticed you have a twin plenum, one of the biggest problems with these is yhe throttle pot reads off the slave butterfly, so you can open the throttle on light throttle position to allow more air in but the throttle pot doesnt register, are you far away from me to have a look?,
Mac have you reset the throttle positon, if your throttle pot is a few figures out it will cause havoc?

I would love to bring it down to you rob but im a million miles away from you in sunny devon, im using an after market throttle pot, but as you mentioned the second butterflys slightly lazy...(pennys dropped)
Have you managed to get around this before? Last year i spoke to John Eales about the old centre pull he used to make but it was silly money to get a one off made.

If your running throttle angle you really need to set the plenum/engine to run on the butterfly that is using the throttle pot, if you dont you are just going to be banging your head on a rather solid wall!

[macdeb]

Quinny said:

Put the old plenumn back on

Go put your cravat on for the AM club meet.