Ignition angle?

[Nick P]

I have had my ignition angle set to the 'standard' and was told that this is 12'BTDC......is this correct, as the paperwork says it was 19' previously?

[shpub]

12 is a good starting point. There is no real standard as the ignition is normally set dynamically to suit the car.

[Nick P]

I must admit that it does feel a bit flat since i got it back from service, so maybe it was changed to 19' to suit the car?
When I floor the throttle in first from tickover, it wont wheelspin in the dry...I'm sure it did before.(Chimaera 400)
Anyone else got a 400 to compare to?

[ssc1]

am i to take it that the 12deg btdc is at idle or what as my 400 seems abit flat on takeoff and dont spin the wheels in first either, i just thought this was ok as its only a 4.0 but it seems to run out of steam at about 120mph and my 430 used to power all the way up to 160...

[shpub]

Static

[ssc1]

excuse me for being a bit thick but how do you set it as static as it has electronic ignition module which i thought could only be set dynamicaly , is the crank set to the 12deg position and the dizzy set so that the trigger is lined up with the sensor or what and there must be a dynamic setting to check as well.

[Nick P]

ssc1 said:

am i to take it that the 12deg btdc is at idle or what as my 400 seems abit flat on takeoff and dont spin the wheels in first either, i just thought this was ok as its only a 4.0 but it seems to run out of steam at about 120mph and my 430 used to power all the way up to 160...

Blimey, I must be well off then....I had a bit of a tinker with mine last night and it pulled to 140 easily....but it still feels slower than it was pre-service

[ssc1]

well it will go faster than 120 but it just seems to take a long time and once in top at that speed it dont accelerate at all and i think it should at least go on untill about 150 ,its had a new camshft fitted as well so it shoud be ok and its only done 60k ..oh and has anybody set theirs dynamically please

>> Edited by ssc1 on Monday 4th August 10:38

[trefor]

Out of interest, is your speedo reading right?

Edited to say: or maybe the old 4.3s speedo was a bit 'keen'

>> Edited by trefor on Monday 4th August 10:48

[ssc1]

the speedo on the 430 used to over read by about 7mph but i had a hand held gps handy for most off the high speed runs and it topped out at 163 on a big wide road,but have not used this on the 400 chim as yet. thats why i was wondering if the timing was spot on but looking at the threads on here it seems that it is set by feel rather than a set of figures, yes it needs to go on a rolling road but its finding the time to get that done plus sort out the other little faults on the car(exhaust)

[david beer]

I posted on the "general tvr" about tinkering until there is no pinking, works for my Griff 500 with two stage cooling and insulated air intake.

[Nick P]

Ok, I have had a bit of a tinker with the dizzy...if I turn it clockwise it goes bery lumpy, making a rattling noise and stalls...if I go the other way it does not seem to do a lot, but becomes very 'wooly'....do I go the 'lumpy' way until just before it gets lumpy? (looking down on the dizzy that is clockwise)

[shpub]

You don't do either. Setting the ignition wrongly can screw the engine by causing pre-detonation. It also has a major effect on the emmissions and general running, so it is frequently set up using a gas analsyer and timing kit.

If you want to stop pinking then it very fine adjustments are needed and the only test is to drive the car and see if it pinks.

This is covered in the bible. The best advice is unless you know what you are doing and have the right kit to set it up... leave weel alone or get someone who does to do it.

[Nick P]

Ok...thanks...I'm off to an expert to get it sorted.