Differences between ignition timing on the same car, with the same mods.

Only change is fuel.



You can see the power differences here:

https://www.evolutionm.net/forums/sh...d.php?t=374848

Everytime I tune with this fuel I am all smiles, you can probably guess why.

 

Huge jump..I'm waiting to see if I can run the same timing with with th e-70 winter blend..Being as though it gets chilly at night over there I am wondering what % of ethanol you guys actually get, but it probably stays the same year round regardless..

 

Not sure what the actual ethanol content is in our winter blend but I know we don't get the lowest blend the colder states get.

I believe we are on the winter blend already according to that chart that was going around here awhile back :

http://www.norcalmotorsports.org/use...85season-2.jpg

Also you might run a little more timing. The above was a Evo 9.

I run a couple degrees more on my 8 on E85.

Also the above is about 1* back from MBT since it's a customers car and it gets driven at autocross and track events.

 

Do you increase the timing much on the part throttle maps as well? I noticed that I was able to run absurd amounts of timing at WOT on my DSM. As in, I was running 12 degrees at 7500 and with more load I was running 24 degrees at the same RPM with no knock still. Then my clutch let out and I had to park it for the year.

I was able to bump my timing a full 5 degrees at peak torque, looks like you could only get a few more degrees in. Must be an evo thing.

 

What boost you running there Bryan?

We are still waiting for E85 in my state

 

did you increase boost. because with my meth tune at first I left fuel/boost alone and just added 6* timing and it didn't do nothing. gave me like 0.1 seconds better at the track.

 

^ that's very odd, you should definitely be getting more power with higher timing.

 

Peak HP boost is pretty much the same and there was 73whp peak gain

 

well I guess here is more proof that all cars are different. amazing how some like timing where others like boost or leaner a/f.

my meth timing looks pretty much like yours except i got 6* peak timing 3500RPM
and 20* timing at 7,000RPM.

 

High 27 peak and 20 at 7k+

Yea timing is changed all over. I spent a bunch of time/miles/fuel mapping on my personal Evo 8 for E85. Of course the 9 is slightly different in timing but the strategy does carry over.

The above is 1-2* below MBT as it's a customers car and he autox and tracks it so I wanted to keep it safe.

I've found E85 is usually not a knock limited fuel. You get to a certain point and it will not knock, even beyond MBT. The dyno is good tool when tuning E85 as you can see when you go beyond MBT. Road tuning for knock might get a rod through the block.

 

That's quite a bit of timing. These values are 2-4 deg higher than my values from 5000-7000 rpm. Pretty amazing that these values are still 1-2 deg below MBT. BTW, are you checking the plugs for det?

 

Well he has no cat and a open filter so that frees up some flow. Catted cars always seem to take less timing up top. Those stealth catbacks seem to not like timing either from what I have seen.

Yes checked plugs, all fine. I actually had to pull them to gap them down as they where misfiring, even at the same boost levels as his 100 tune.\

Also, above I stated that E85 can be a not knock limited fuel. I can/do see noise at peak boost/torque if you push it, but out the top 5k+ it usually is VERY hard to see any noise even beyond MBT.

 

God 19* at redline so i guess 93 would fall somewhere right in the middle. Goes to show you what fuel can really change. Nice stuff bryan.

 

Yeah, I've got to figure out some sort of quiet highflow air intake setup.

How many cars with Stealths have you tuned? I could be convinced to try something different if there was another exhaust that was as quiet but flowed better.

 

It makes sense. You have to sacrifice something for peace and quiet.