alky tuning
Thread Starter
Joined: Nov 2001
Posts: 7,903
Likes: 1
From: Cleveland, OH
alky tuning I got the smc kit on today but dunno where to start tuning. I added some timing which should give me some knock. Just holding at 2000 rpms in idle, my a/f is 14.7......hit the alky test button and it drops to 13.2.....wow 1.5 points. I'm gonna see if I can eventually run 20 degrees of timing with 93/alky at 15psi on the incons. That would be cool...possible...dunno.
I am running about 18 degrees before tq peak, then dipping down to 13/14 during it and then back up to 16/17 up top. I was running the smaller nozzle (can't remember the size) with the pump speed all the way up.. coming on at 4#'s of boost and up. You can look at my graphs and see my afr.... my incar wideband was pretty much right on with the dyno one. I had to remove quite a bit of full to get the afr from being pig rich. This was with about 7-8psi. I am now running the next size up nozzle (again I don't remember the size) with my pump speed at 5-6, same boost setting, same timing and with 11psi my afr curve is the same as before with the smaller nozzle/less boost.
Though cranking the speed nozzle pegs my afr all the way across.
I am curious to hear others opinions as well.... Chevy1.... A DEE O ?
Though cranking the speed nozzle pegs my afr all the way across.
I am curious to hear others opinions as well.... Chevy1.... A DEE O ?
TECH Fanatic
Joined: Nov 2001
Posts: 1,190
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From: Las Cruces, NM
Originally Posted by cablebandit
I got the smc kit on today but dunno where to start tuning. I added some timing which should give me some knock. Just holding at 2000 rpms in idle, my a/f is 14.7......hit the alky test button and it drops to 13.2.....wow 1.5 points. I'm gonna see if I can eventually run 20 degrees of timing with 93/alky at 15psi on the incons. That would be cool...possible...dunno.
Just keep in mind that your afr as read by the wideband will be a little off. See attachment which is from the FJO wideband kit which uses the ntk sensor. This table is for running a completely alternate fuel. Since you are mixing fuels it will be some ratio of alcohol to fuel. So your afr may a little lower than actual.
Gary
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Yea it is low... but I don't have any experience running boost on a high comp engine... so I was just trying to be safe.
What is everyone else running with stock comp and alky? How much boost? I am running straight 93 as well.
What is everyone else running with stock comp and alky? How much boost? I am running straight 93 as well.
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When I had my GN, I tuned alchy with an EGT gauge. First, you baseline your EGT and write it down (the actual number isn't that important). Then you dump the alchy on. This should totally kill your power. Once the alchy is pumping, you add boost and timing until you get back to the original EGT.
It helps to get a good digital gauge with memory, so you can look at your peak readings after a run and tune to that. The good ones are small digital gauges that you can hide just about anywhere too. The good GN vendors probably have them in stock. (try www.aggressiveauto.com).
Good Luck!
-Geoff
It helps to get a good digital gauge with memory, so you can look at your peak readings after a run and tune to that. The good ones are small digital gauges that you can hide just about anywhere too. The good GN vendors probably have them in stock. (try www.aggressiveauto.com).
Good Luck!
-Geoff
We had to back out 2deg with the alchy on my car. I was getting knock down low in the rpms and this cured it. I am at 15deg at WOT. Pump speed 8 coming on 3200, 15psi nozzle. Keep it rich and play it safe. I hold my breath everytime I womp on the car. Like today on I94, 11psi, 5th gear.
10 Second Club
Joined: Apr 2002
Posts: 1,755
Likes: 2
From: Cincinnati, Ohio
With 93 octane and 10 lbs, I could put in 16 degrees max timing before I would get a hint of KR. I put 100 octane in and pullied to 12 lbs.(from 10) and raised the timing to 21. I got a hint of KR on only 1 run, zero on most (this was with the alky off). Anyway when the tank of 100 was out I put in the 93 and turned the alky back on. I found that the alky pretty much performed the same as the 100 with just a hint of KR on 1 run, zero on most (as long as I iced the aftercooler water to bring the IAT back down). The funny thing is that even though you could feel a dramatic power increase I couldn't hook off the line and actually ran slower (11.49, 1.96 60'). I thought I had a shot at 10's. Because I'm still working with the Nittos this week I'm going to run with a full tank of gas in hopes that it helps with traction, we'll see.
TECH Resident
Joined: Jan 2002
Posts: 956
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From: Phoenix, AZ
I was running the 15gph nozzle, straight alky. 12psi on 91 octane. My knock sensors were disabled 'cause the PCM thought they were broke ( even though I swapped new ones in ). I had the pump speed full on, coming on at 3-4psi, about as low as I could. Unfortunately I blew the motor, I'm sure it was detonation in #1, but we couldn't hear it. In looking at my dyno graph now I see that I actually hit 12:1 AFR at 5600rpm . . . that is probably why I cracked the ringland. I thought I was lower than that! And if it's 12:1 on the dyno, doesn't that mean it's prolly close to 13:1 on the street??
- Dug
- Dug
Good info guys.
Ok so now I am worried... where is the limit with boost/alky before you start not getting even distribution with these intakes?
I was told with straight alky, the octane with 93 is approx 104... so run as much boost/timing as I could with 104 and no alky. But I would think the cooling effect would raise that point even more... anyone?
Ok so now I am worried... where is the limit with boost/alky before you start not getting even distribution with these intakes?
I was told with straight alky, the octane with 93 is approx 104... so run as much boost/timing as I could with 104 and no alky. But I would think the cooling effect would raise that point even more... anyone?
Are you having the car tuned, tuning yourself, or keeping your tune and adding alky and blindly trying to find a safe setting?? I ask b/c Im probably going to take a shot at the last one if someone has a good idea of how to set it up, otherwise its another $400 for a dyno/ wideband. 
Originally Posted by cablebandit
i bought a LM-1 wideband so I will do mine myself