Short block…. Compression ratio?

[09jsw]

RPG doing mine in 12.1. I checked with tuner before hand and he said not a problem even on 93 he will just limit timing until I do E85.

I would never go lower then stock compression. This is a very high tech engine and not some old school Ford with shit flow design.

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[K4fxd]

At some point loss of timing advance negates any gain from compression.
12 to 1 on pump gas with a blower is asking for trouble. Unless a gen 3

 

[09jsw]

At some point loss of timing advance negates any gain from compression.
12 to 1 on pump gas with a blower is asking for trouble. Unless a gen 3

I’ll be running E85 90% of the time until winter. I won’t be on pump unless it’s winter time. Guess I didn’t word it correctly.

 

[K4fxd]

I’ll be running E85 90% of the time

Should be fun.

 

[09jsw]

Should be fun.

Hopefully around 900+ yep.

 

[SolarFlare]

At some point loss of timing advance negates any gain from compression.
12 to 1 on pump gas with a blower is asking for trouble. Unless a gen 3

how is a gen 1 or 2 at 12:1 asking for trouble but a gen 3 ok?

 

[K4fxd]

how is a gen 1 or 2 at 12:1 asking for trouble but a gen 3 ok?

The DI helps with detonation prevention.

 

[SolarFlare]

I don’t doubt it. Maybe cap timing 1 or 2 degrees lower. I’m talking about the basic setup of 8-10psi.

at the end of the day anyone buying a mustang to add a power adder then building a motor to run pump 93 is asking for trouble…..and slow time slips.

 

[engineermike]

at the end of the day anyone buying a mustang to add a power adder then building a motor to run pump 93 is asking for trouble…..and slow time slips.

So what’s your solution if you want to go fast on 93?

 

[SolarFlare]

So what’s your solution if you want to go fast on 93?

you don’t.

 

[engineermike]

you don’t.

I’m assuming you’re joking since cars have gone sub-8’s on pure pump gas. Seriously, though, for folks wanting a fast car that runs on common fuel, what would be your advice? Surely not a camaro or challenger…

 

[SolarFlare]

I’m assuming you’re joking since cars have gone sub-8’s on pure pump gas. Seriously, though, for folks wanting a fast car that runs on common fuel, what would be your advice? Surely not a camaro or challenger…

link to coyotes running 8s with boost and Nothing but 93…

 

[SolarFlare]

And btw. I’m not telling OP to go one way or another. I think he should gather input from tuner and his builder of choice.

 

[engineermike]

link to coyotes running 8s with boost and Nothing but 93…

I asked what your solution was if you want to go fast on 93. You said “you don’t”….except it has been done. I didn’t say coyote. So what’s your solution in a modern full-weight car?

 

[Jackson1320]

The DI helps with detonation prevention.

The gen1 or gen2 can be just as safe as a gen3 with 12:1. It’s easier to have your tuner adjust the tune to safely run 93 with 12:1 then it is to change the compression ratio when you go e85
If you are planning to run 93 only then 12:1 on a gen1/2 is going to be more harm than good. But if are you planning on running e85 most of the time in then 12:1 is not a problem

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