MSD ignition options for ls1?
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MSD ignition options for ls1? hi again. i'm getting some detonation on uk 95 octane fuel with the basic edelbrock/msd ls1 ignition box, even using timing pill no1.
any higher no. timing pill than that it dets its head off really. its a stock compression ls1. obviously i could go for the fully mappable msd box , could anyone give me a part no/model no please if they have it to hand?
I assume its the same plug n play connections to the stock cam/crank sensors and coil packs, or do i need a new msd loom also?
the LS1 edelbrock/msd box i have currently has a serial port but apparently wasnt rigged up to anything so the software/serial lead is disabled. edelbrock havent been totally helpful in the past when i asked technical questions.
thanks
any higher no. timing pill than that it dets its head off really. its a stock compression ls1. obviously i could go for the fully mappable msd box , could anyone give me a part no/model no please if they have it to hand?
I assume its the same plug n play connections to the stock cam/crank sensors and coil packs, or do i need a new msd loom also?
the LS1 edelbrock/msd box i have currently has a serial port but apparently wasnt rigged up to anything so the software/serial lead is disabled. edelbrock havent been totally helpful in the past when i asked technical questions.
thanks
http://store.summitracing.com/partde...5&autoview=sku
That's the one i will be using. I'm not sure why you would be pinging with a stock compression engine. Are you sure it's knock? There is an Edelbrock box, and there is an MSD box. The MSD is the only programmable one.
That's the one i will be using. I'm not sure why you would be pinging with a stock compression engine. Are you sure it's knock? There is an Edelbrock box, and there is an MSD box. The MSD is the only programmable one.
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hi shaun cheers for reply.
mine is the edelbrock one, but its made by msd. its fixed on just 6 timing pills, and i get some det on anything other than no1. its audible using our 95 octane UK fuel, it did go away a little on 98 octane fuel tho on pill no1.
the edelbrock unit also has no rev limiter which seems a waste, and altho its got the serial port apparently its not hooked up and doesnt work.
i think i need to swap for the one you use and get it mapped to suit our pump fuel.
the engine is stock compression and ran fine, other than slight det on no1 pill, it made 400bhp at the wheel hubs but i want it to be safe.
mine is the edelbrock one, but its made by msd. its fixed on just 6 timing pills, and i get some det on anything other than no1. its audible using our 95 octane UK fuel, it did go away a little on 98 octane fuel tho on pill no1.
the edelbrock unit also has no rev limiter which seems a waste, and altho its got the serial port apparently its not hooked up and doesnt work.
i think i need to swap for the one you use and get it mapped to suit our pump fuel.
the engine is stock compression and ran fine, other than slight det on no1 pill, it made 400bhp at the wheel hubs but i want it to be safe.
400bhp? So have you installed a cam? If so did maybe possibly you get it one tooth off? I'm not entirely sure how the cam sensor works but if you had if off i would assume it would advance/retard timing adversly. Are you absolutely positive that it's pinging? I had a carb that caused the same issue and it was really just fuel starvation causing it to go lean and ping.
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hi shawn
sorry yes its got a mild cam, 220/220 and .510 lift. was lined up dot to dot. definate pinking, quite bad on pills 6,5,4 so went down to no1 , slight issue still until we used better fuel. didnt get time to try higher pills on better fuel than 95 octane tho.
dyno guy reckons he has seen this before on a uk car with this fixed timing system limited to the 6 pills.?
sorry yes its got a mild cam, 220/220 and .510 lift. was lined up dot to dot. definate pinking, quite bad on pills 6,5,4 so went down to no1 , slight issue still until we used better fuel. didnt get time to try higher pills on better fuel than 95 octane tho.
dyno guy reckons he has seen this before on a uk car with this fixed timing system limited to the 6 pills.?
Hmm to be honest I'm not really sure how the Edelbrock system works but i do know for a fact that it is not adjustable. Is your carb a vacuum secondary carb? I had horrible pinging on the Pontiac 400 i removed and narrowed it down to it running lean when the vacuum secondaries opened. I had my timing backed all the way down to 8* idle, vac advance unhooked and it would mechanically advance to about 18 to get rid of ping.
You should be able to run 87 on that setup. I'm not sure what the edelbrock timing pills consist of or how the advance increases with throttle percentage but perhaps that is malfunctioning? Maybe the cam or crank sensor is going bad? I'm not really sure.
Is it pinging at part throttle, WOT? In gear underload or just when revving? If you have access to a dyno and wideband 02 that could really help you diagnose your problem. I really think it might be fuel related, not so much timing related. I used to run my 465rwhp 01 Z06 wit 93 octane and it had something like 33-34* of timing.
You should be able to run 87 on that setup. I'm not sure what the edelbrock timing pills consist of or how the advance increases with throttle percentage but perhaps that is malfunctioning? Maybe the cam or crank sensor is going bad? I'm not really sure.
Is it pinging at part throttle, WOT? In gear underload or just when revving? If you have access to a dyno and wideband 02 that could really help you diagnose your problem. I really think it might be fuel related, not so much timing related. I used to run my 465rwhp 01 Z06 wit 93 octane and it had something like 33-34* of timing.
According to the MSD instructions the #1 pill should work just fine. LSx engines don't really like a ton of timing.
http://www.msdignition.com/pdf/frm26894_6010.pdf
Andrew
http://www.msdignition.com/pdf/frm26894_6010.pdf
Andrew
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mine is certainly driveable on pill1, and idles etc fine. the edelbrock kit (manifold /cam/msd box) instructions however seem to point to pill 4 , 5 or even 6 being useable with the cam i have. edelbrock said the same as well.
my carb is a 750cfm demon with mech secondaries, and i hooked up the vac port (constant vac) to the map sensor on the edelbrock/msd box as directed.
any suggestions if i've missed something here or should it not be pinging (at high revs/load on dyno).
cam/crank sensors must be fine as its starting/idling and running fine other than high load. afr was measured with a wideband, maybe a little lean tho so that will help, but with pill no 4,5 or 6 it was pinging at medium revs and load and 13:1 afr.
my carb is a 750cfm demon with mech secondaries, and i hooked up the vac port (constant vac) to the map sensor on the edelbrock/msd box as directed.
any suggestions if i've missed something here or should it not be pinging (at high revs/load on dyno).
cam/crank sensors must be fine as its starting/idling and running fine other than high load. afr was measured with a wideband, maybe a little lean tho so that will help, but with pill no 4,5 or 6 it was pinging at medium revs and load and 13:1 afr.
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According to the MSD instructions the #1 pill should work just fine. LSx engines don't really like a ton of timing.
http://www.msdignition.com/pdf/frm26894_6010.pdf
Andrew
http://www.msdignition.com/pdf/frm26894_6010.pdf
Andrew
i assume the edelbrock/msd fixed box with 6 pills that i i have uses the same timing curves as the no's 1-6 on that link. i'll ask msd tech help if need be.
cheers again
