So I got a question and need help figuring out what the deal is.

Here is the list of mods:
- 1990, 1.6l stock internals
-Begi-s cast iron mani
-Gt2554
-Small intercooler
-12.5psi
-e85
-600cc injectors
- walbro 255 pump
-custom 3" downpipe
-2.25"(i think thats what it is) Magnaflow exhaust
-MSpnp

From logs it looks like i am running about 10.5 afr at WOT. This is a bit rich especially on e85. The timing at wot is 18 degrees. Which i think is a bit retarded (lol, thats a technical term) for e85.

Last year on 93 pump, begi skinny downpipe and about 11psi i made 191 and 179 torque. This time with new downpipe, e85 and 12.5psi i made 182 and 180 torque.

Is my timing too retarded? what is safe timing on e85? 20 degrees? maybe even 25 degrees?

Should i lean out a bit? 11.5 at wot?

I am including a couple pulls in 2nd gear and my map.

 

timing could probably be safe on 93 octane...and e85 is how much less efficient than 93 octane?

from I know about e85, you need about 20% more fuel than you would with 93 octane to get the same AFR and then maybe a 10* bump in timing advance to get power...

 

Dynojet?

 

I got about 30% more fuel already. 10* really? Thats interesting. I know i can bump the timing up, but i can no idea i could go that much? So 10* all around?

I witched to e85 because its higher octane and less prone to detonation and my egts are way way lower on it. And it does not smell as bad as pump.

 

yes, sadly it was dynojet both times.

 

e85= fail yeah bump that **** up closer to 30 or so and then get your fuel sorted. you would prob be better of using my timming map imo

 

More timing!

I once made 138whp at 12psi with my Greddy kit. Figured out later that my harmonic balancer had slipped and my timing was way retarded.

 

retarded map is retarded

 

way too rich and way too little timing. you're using e85 you should be closer to 11.7-12.0 afr's and timing could be bumped WAYY up safely.....you are giving up SOO much power with that map.

 

why e85 =fail?

I will lean it out a little bit up top and scale the timing about 10 degrees all the way across and see what happens.

 

Your puny exhaust isn't helping either.

 

I know its not. I cant even hear the turbo spool with it.

Thats the next thing i need upgraded. a full 3" exhaust or 2.5" is pretty good?

 

Might as well do a 3 incher if your going to go through the trouble of it.

 

true.

 

10.5 (gas equiv) afr is too rich with E85, you can pull at least half a point of fuel (gas equiv). I will post my map and logs later, but if you can find my timing map on here from my last tune we added ~4-6* spark angle to that to find mbt with E85, and left it there. I thought we were going to be able to add more spark, but mbt came up earlier than I thought. This is with ~1.9L, 2000 head, etc.

 

Well, the lc-1 reads in lambda so when it reads 14.4 is actually stoch(sp?) for e85.

 

You are going to **** when you see my info. STFU until you do.

 

Lambda=1 for any wbo2 is stoic for E85 or gas. If there isn't a way to translate lambda differently for different fuels on the display and if the WB is "set" for gas, then 14.7 is lambda=1 when you are burning E85, and it will show as 14.7. Gots? It makes it easy to tune when you are used to tuning gas.

You can run a smidge (like half point) leaner on the big end with E85, because of it's good properties. Mangina will confirm.

 

I'm 99.99999999% sure that if you hook the lc1 up to your laptop with the serial cable you can change the stoich value to e85. Did you do that already?

 

As i understand you dont have to change anything. Because if 1=14.7 for gas and 10.5= 1 for e85 the lc-1 will read 14.7 when e85 is at 1 lambda. So there is no difference.

So what i mean is it does not matter what fuel you run at stoich the gauge will read 1 and translate it to 14.7 afr.

At least thats what i was reading online and thats what the tuner at the dyno told me.

You can change it to e85 reading but that will only be more confusing because the gauge will be reading 10.5 at stoich and I am used to seeing 14.7.