I went to the dyno tonight hoping to have a chance to tune in the alky injection. I was hoping that the alky would give me the extra fuel that I needed past 6k. It didn't My guess is because I was using a 50/50 mix.

There are two pulls here, one is with the 2.95 pulley and the other is with the stock vortech T-Trim pulley.

Here are the sheets in SAE and STD..
http://www.pcmforless.com/images/alv...TD10.15.05.jpg
http://www.pcmforless.com/images/alv...AE10.15.05.jpg

Anything above 480rwhp my fuels start rising. Good news is my fuel pressure is staying 45-47psi. I say that because I really do not feel like swapping pumps. I'm using 42SVO's right now.. I'm just going to swap up to a Motron 60 that way I can run my 15psi pulley later.

Here are the mods:

93 LT1 355 9:1 compression
210/220 500 500 114 LSA cam
Stock ported heads, stock valves
52mm throttle body
Hooker LT's Magnaflow catback
3.73 gears
T56
42LBS SVO injectors
T-Rex pump
Stock intank..
Vortech T-Trim Aftercooled
Fabricated water cooler
alky injection 15 gph 150psi.

I've only been to the track once with the new gears and with the lowest boost pulley I have it went a 7.5 @ 95.4 mph on 17'' BFG drag radials. I'm shooting to have it trap 100mph by the end of the year.

Heres the time slip.
http://www.pcmforless.com/images/alv...d/timeslip.JPG

BTW.. I was quite suprized to see the fuel pressure still rising when I shut the car down tonight.. I believe alot of people run out of fuel with the T-Rex/stock intank because they run into voltage problems. I've got 10 ga. wire running back for the T-Rex (both power and redundant ground) and the stock intank is on the stock wiring. If you put work into a fluid you get a change in KE, PE, or H. This talk about one being a restriction over the other is for the most part BS IMHO. Granted you have to compound pump ineffiecencies but its not like the T-Rex will never flow good because the intank only flows X. Fuel pressure was 43 at the start of the run and 47 when I shut down... Thats proof enough for me that its working.

 

Alvin, it is my opinion you are using the water/alcohol injection for the wrong reason, or not for what it was intended. Regardless, what is the flow you are experiencing with the injection nozzle(s) you are using? Have you figured out the exact amount of alcohol that is being added to the A/F mix? I trust you are using a WB sensor for AFR monitoring? With the dissimilar fuels used, if using the WB, tuning with lambda is necessary, AFAIC.

Gary

 

The alky is more of a way to make the intake air charge temps lower which is going to need more fuel in terms of gasoline.

Even though your pressure is good the other part of that is the volume, 500rwhp and RPM pile up to eat a lot.... you don't have a huge fuel problem but you might start to see one later on when you add the injectors more boost or other internal mods.

Bret

 

Your wrong there. The key benifit behind alky injection is replace fuel with less methonol. Your using more fuel in a boosted car for cooling. You can replace more fuel with less alcohol and curb detonation at the same time.

Remeber methonol is approximately 470 BTU/lbm while gasoline is only about 150 BTU/lbm. Its also got a nice specific heat.

methonol is a fuel, about 1 AFR point in my case but it wasn't enough to get me in range with my injectors now. Let me go grab a few dyno graphs from that night and you can see where "static" point of the injectors happens with methonol vs without.

 

I agree I do not like to bandaid a fuel system with alky injection however theres nothign wrong with doing it. Methonol is a fuel, it does burn... Not a lot of energy involved with burning it but it is a fuel.

I just wanted to get by because we have less than 4 weeks left here before the tracks close down.

You can typically target a leaner than traditional AFR with a alky kit because you've soaked up some heat by evaporating it, your using a milder fuel and in my case water also to create a milder burn. I've seen them go anywhere from 12.0-12.4ish+ and still make good torque and lots of HP.

Because of the way methonol burns you have to do 2 things to make power with it.
1. lean it out because by spraying with a alky kit you just threw in some extra fuel that (if you where tuned in the first place) you didn't nessisarly need and

2. add timing.. kinda an amazing amount actually.. I won't go into specifics but I can tell you that this is the norm.. in fact.


~ From http://www.andersonfordmotorsport.com/


Spray water, alky, or a water/alky mix on a engine without increasing boost, leaning it out, or adding timing and you'll loose power.. guarenteed.

 

I have to run 52psi fuel pressure with 42's to make 500+ to the tire N/A.That is with a Aeromotive 11001. Sounds like ya don't have the volume to push it over a certain RPM. Ya can have pressure without volume.Don't know what HP ya are after.
The methanol ya are using is not enough to add to the MAIN fuel that you are lacking. I have used it before at 100% methanol and it was to help cool the air and decrease the chances of detonation. I have also used N2O to cool the inter cooler. Now this was at 26# boost.and 1200+FWHP.