Ignition Timing Thread

[Chris@Rvengeperformance]

There are some serious obstacle to getting import engines on a dyno, especially ones with miles of intercooler piping like our twin setup.

The domestic v8 guys only have o worry about a handful of flywheel and engine mount configurations on the dyno. Go to a regular engine tuning shop and get the flywheel adapters made, the engine mount brackets/adapters made, an appropriate cooling system configuration, and something to support your intercooler setup, and your engine wiring harness/ecu combination and then you'd be ready to start tuning the car on a stand that has a lot of differences to how the engine is going to be package into a engine bay like ours.

Or put it on a chassis dyno that just needs to me awd. You can hold the engine at a certain rpm with an eddy current chassis dyno anyway.

[Chris@Rvengeperformance]

No idea. Thought a bigger bore would need more timing? I'm 10:1 though. Trevor is 9:1, but I believe it was Hans that also said less timing for 74 swaps.

well at least with the longer stroke there is more time for the power stroke to complete, so it would stand to reason you may need less timing advance. There is also then a greater window for detonation.

[DG]

There are some serious obstacle to getting import engines on a dyno, especially ones with miles of intercooler piping like our twin setup.

On an engine dyno you don't replicate that stuff. You have an air/water intercooler on a stand hooked up to municipal water. Air inlet, air outlet, and some flex hoses. Done.

If you want to get fancy, plumb the water inlet to both hot and cold water and put a temp sensor at the water inlet so you can control the temp of the cooling mechanism.

If you want to be cheap, you don't plumb to municipal water, you plumb to a water tank and recirculate. Make the tank small enough and you can replicate air/air heat soak.

If Lingenfelter's dyno can handle twin turbo V8s, there's no reason why an import shop can't do the same. Those are not serious obstacles.

DG

[Chris@Rvengeperformance]

Often it is an obstacle to get shop that will even deal with dynoing an import at all, I think you underestimate the difficulty, or there would be more people that do it.

I guess my other question is why do you think it would be better than an eddy current chassis dyno? Especially if you are changing the intercooling and other factors that will affect the tune.

[DG]

Well, the ability to quickly do things like A-B-A tests for stuff like cylinder heads, camshafts, and other parts where immediate access to the engine without having to work around the constraints of the as-installed engine compartment means the time to swap parts is reduced by an order of magnitude. That makes testing much more feasible.

I have worked with engine dynos guys; when you are doing development, they are WAY faster than chassis dynos of any sort.

DG

[Chris@Rvengeperformance]

Well, the ability to quickly do things like A-B-A tests for stuff like cylinder heads, camshafts, and other parts where immediate access to the engine without having to work around the constraints of the as-installed engine compartment means the time to swap parts is reduced by an order of magnitude. That makes testing much more feasible.

I have worked with engine dynos guys; when you are doing development, they are WAY faster than chassis dynos of any sort.

DG

that is true. I guess the root issue then is most import parts companies do NOT want to do back to back testing because most of their parts don't make power.

[DG]

I guess the root issue then is most import parts companies do NOT want to do back to back testing because most of their parts don't make power.

There is more than a little truth to this. Doubly true with small, captured audience markets serviced by only a couple of vendors.

The shitstorm that erupted when I started dynoing shocks....

DG

[Blackmount]

I was specifically talking Chassis dyno, but it is my fault for not specifying.

I'm sure most Engine Dyno' guys around here would laugh at me if I told them I had a Mitsubishi Engine I wanted to put on their dyno. Besides; I'm more about what you make at the wheels anyways. anyways.

Did a new log today, however I bought a new phone last night, and its really nice...but I'm still working on getting the log onto the computer XD

The shitstorm that erupted when I started dynoing shocks....

DG

like what would happen if I actually got the resources to start Dynoing Cams?

and what happens everytime someone questions certain vendors cams?

-B

[DG]

I'm sure most Engine Dyno' guys around here would laugh at me if I told them I had a Mitsubishi Engine I wanted to put on their dyno.

Are you kidding me?

When you have an investment in a piece of infrastructure like that, that costs as much as it does, the problem is keeping it working so it can pay itself off. In a machine shop context, "If a machine is not making chips it is costing you money".

Expanding your potential customer base is only a good thing. Any shop will be down for that, especially now when business is slow.

What you probably can't expect is for the shop to eat the fabrication cost for motor mount adaptors and flywyeel adaptors, under the premise that a flood of other Mitsubishis will suddenly show up. As a customer, I'd expect to pay for that (and to keep the adaptors!) But any dyno operator will happily sell you time on his dyno.

DG

[Blackmount]

Hmm, I'll look into it, but for now, my engine is staying in my car because I need it.


Might throw some more timing at it this weekend.....