I have the GM supercharger kit on my '04 Cavalier, and I want to get the HPT for it. I have searched and found that at one point it could not be tuned because it had been locked by GM. I then found a couple posts saying that it may be possible, but nothing confirming that it definitely is. It's my understanding that the reason people say it cannot be tuned is that HPT cannot read the recalibration that I got after I installed the supercharger due to a checksum error, which means that calibration cannot be edited and uploaded to the PCM, right? So as I understand it, if I can get the HPT file from someone who has a tune for the S/C (I'm 99% sure I can, but it would be great if someone here has one that I can start with), I can just upload that to it and then fine-tune from there, correct? If I'm mistaken there, then am I correct in understanding that I can get a used PCM, install it in the car, disable VATS, and tune from there? Or does something have to be done to the BCM as well?
Thanks,
Jason
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'04 Cavalier
2.2 Ecotec Supercharged w/ 2.9" pulley
Charge air cooler
Poly bushings - lower control arm and engine/trans
Once the ecm is flashed with the GM s/c tune for the ecotec, it gets locked. So a used computer is what you are going to need. Also if you're running a 2.9 pulley I would recommend at least 42 lb injectors. Nothing has to be done to the bcm.
a 2.9 might be pushin the 42s to their limit, im already at 93% duty cycle on a 3.0 with 42s..
i have a decent 42# injector, 3.0 pulley tune (fake 2.5 bar).. i could help you get started..
12.33 @ 111.67 mph [Oct 2009]
Dyno'd on 08/02/09 - Mustang Dyno:
327.6 WHP 333.6 WTQ [10.1 AFR]
evilmonkitar wrote:a 2.9 might be pushin the 42s to their limit, im already at 93% duty cycle on a 3.0 with 42s..
i have a decent 42# injector, 3.0 pulley tune (fake 2.5 bar).. i could help you get started..
You have methanol right?
I found that with the methanol/water injection on, it richened it up from 11:1 to 10.5:1
So I leaned it out in hptuners and my highest duty cycle was a little less than 80 %. But each car is different.
I guess the stock kit injectors are being maxed out when smaller pullies are being used.
IDC's are not the only thing you should be looking at. Do not go lower than a 2.9 at the most on 42's though. The GMS2 42's seem to handle higher duty cycles and pulse widths well but it's not something you wanna gamble with all the time..
Lols.
(Tom) S/C Fire wrote:evilmonkitar wrote:a 2.9 might be pushin the 42s to their limit, im already at 93% duty cycle on a 3.0 with 42s..
i have a decent 42# injector, 3.0 pulley tune (fake 2.5 bar).. i could help you get started..
You have methanol right?
I found that with the methanol/water injection on, it richened it up from 11:1 to 10.5:1
So I leaned it out in hptuners and my highest duty cycle was a little less than 80 %. But each car is different.
I guess the stock kit injectors are being maxed out when smaller pullies are being used.
yea i use water/meth. good ol' parade blue windshield washer fluid lol..
12.33 @ 111.67 mph [Oct 2009]
Dyno'd on 08/02/09 - Mustang Dyno:
327.6 WHP 333.6 WTQ [10.1 AFR]
hey evilmonkitar...i was using that same stuff but then i switch to denautred alcohol and filled half up and then put half blue windshield washer fluid. Now its smells so good when i get on it. Try it.
where can you get denatured alcohol from?
12.33 @ 111.67 mph [Oct 2009]
Dyno'd on 08/02/09 - Mustang Dyno:
327.6 WHP 333.6 WTQ [10.1 AFR]
what about the soaps that are in teh windshield washer fluid guys??? just a questions. does it mess with anything?
I was using denatured alky before I found methanol. You can get it (DN alk) at home depot for almost $18 a gallon. Or you can buy a five gallon tank of methanol for $38 that works better.
dont think the soaps in the basic washer fluid harm anything. at least thats what the alky guys on cobaltss are sayin.
home depot has methanol? or just the DN alky?
12.33 @ 111.67 mph [Oct 2009]
Dyno'd on 08/02/09 - Mustang Dyno:
327.6 WHP 333.6 WTQ [10.1 AFR]
Just order devils own mix..it's not that expensive.
Lols.
evilmonkitar wrote:dont think the soaps in the basic washer fluid harm anything. at least thats what the alky guys on cobaltss are sayin.
home depot has methanol? or just the DN alky?
Race shops that sell race gas will probably have methanol. I have yet to find methanol in any chain store. D.N. alcohol from home depot.
You will be much happier with methanol. I added 4* of timing between water/alky and water/meth.
(Tom) S/C Fire wrote:Once the ecm is flashed with the GM s/c tune for the ecotec, it gets locked. So a used computer is what you are going to need. Also if you're running a 2.9 pulley I would recommend at least 42 lb injectors. Nothing has to be done to the bcm.
Thanks! I've got the stock LSJ injectors in it which I believe are 36 lb? Looks like I'm getting some new injectors then. I still haven't installed the intercooler, so I'm guessing the only thing that saved my engine is the insanely high IAT not allowing the injectors to be maxed out. I ordered the radiator and pump, should be here early next week, I'm glad to know I need to go easy on it until I get the larger injectors. I was planning on taking it out for a run on the interstate after I got the intercooler on, looks like that may not happen unless I get the injectors by then. Any suggestion for the brand of fuel injector?
evilmonkitar wrote:a 2.9 might be pushin the 42s to their limit, im already at 93% duty cycle on a 3.0 with 42s..
i have a decent 42# injector, 3.0 pulley tune (fake 2.5 bar).. i could help you get started..
I'd appreciate the help with the tune file. I was going to ask a member of automotiveforums.com for help with it, the guy that sold me an extra kit he had laying around after it was discontinued from GM, but he sold his Cavaliers to buy a Subaru of some kind and hasn't been around since. I was going to PM him, but if you have it, I'll take it (I hate getting PMs asking for help, and I bet he does too)
I was going to start another thread on the subject of water/alcohol injection, but since it came up... I'm getting a kit soon, and have a question about the plumbing. When I was researching about the supercharger, I found something somewhere that said not to inject something(?) before the supercharger or it will damage the coating in it and lose lots of boost. I don't remember what that "something" was, where I found it, or if was from a reliable source, and I can't find it again. At that time I thought I'd install the kit and leave it at that, so I didn't even read it that carefully. I should have known that if I could get more power, I would. The more I think about it, the more I think it was fuel, but I'd like to make sure it's OK to inject alcohol before the TB as the installation instructions suggest. And as long as we're talking about it, the AEM kit that I'm looking at has a 130cc/min nozzle for up to 250 HP, which is where I'm going (all stock internals for now), which I figure would safely give me 30 minutes of alcohol at WOT with a 1 gallon tank (using .9 gallons). The reason I say safely is that here in Iowa, it's hard (I don't use the word "impossible", but I probably could here) to find quality 93 octane gas, so after I install the kit I'll start running 89 octane and save $.30/gallon. That worries me slightly, I don't like the though of running out of the ability to use boost, and I don't want to have to fill the tank every day. I have a 15 mile drive to/from work, and running late in the morning (every day, it seems) I tend to get pretty far into the boost. It's a 2 lane highway, so with passing cars 1 or 2 at a time it's pretty much 15 minutes of alternating WOT and braking hard followed by WOT between stop signs/lights for a couple more miles. I'm also still loving the extra power, and honestly I've started driving way too aggressively even when there is no chronological reason to do so. Combining these driving attributes, I think I'd have to fill up every day. Not a
huge deal since as an automotive technician I have access to 55 gallon drums of the stuff for dirt cheap, but over the weekend I could see having to fill it several times. Anyway, today while I was modifying the lower part of the hood latch support to make room for the intercooler radiator, I noticed a huge empty space inside the RF fender, looks like I could easily weld up a 2-3 gallon aluminum tank to fill the entire space. That may also be the best way to go since I don't really see a good place to mount the 1 gallon tank that comes in the kit, the only place that it would physically fit is right above the exhaust strapped to the strut brace, and I'm not too crazy about having it heated to 100+*. While it would fit in the RF fender, if I fabricate a bracket to hold it, I may as well just build a tank. So I guess my question is what would anyone who has alcohol injection do? How long does "X" gallons last in your real-world driving, and how does it compare to mine?
Thanks!
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'04 Cavalier
2.2 Ecotec Supercharged w/ 2.9" pulley
Charge air cooler
Poly bushings - lower control arm and engine/trans
My one gallon tank and 150psi pump fit in the passenger side fender well. I had to move some stuff around like the horn, but it fits nicely. I would still recommend at least 91 octane with alky injection. Also how long the tank last is highly dependent on how you drive. Two weeks of commuting is usually how long mine lasts with the alky set to come on at 5 psi, which is easy to hit with the m62. Oh and its perfectly fine to inject meth/alky/water into the charger. It does no damage to the s/c. Gm actually has the nozzle in the "autocross" concept car welded onto the inlet of the supercharger (post t/b pre charger).
you need to space out your paragraphs from now on
id use a 300cc nozzle to start with, and if you get on it all the time you will obviously use up a bunch of fluid, so dont get on it all the time lol
as for injectors, i got the lucas 42# injectors from www.zzperformance.com and i bought their cobalt harness for it and soldered the plugs onto my harness, so thats what i did. total shipped it was right around $200
12.33 @ 111.67 mph [Oct 2009]
Dyno'd on 08/02/09 - Mustang Dyno:
327.6 WHP 333.6 WTQ [10.1 AFR]
(Tom) S/C Fire wrote:evilmonkitar wrote:dont think the soaps in the basic washer fluid harm anything. at least thats what the alky guys on cobaltss are sayin.
home depot has methanol? or just the DN alky?
Race shops that sell race gas will probably have methanol. I have yet to find methanol in any chain store. D.N. alcohol from home depot.
You will be much happier with methanol. I added 4* of timing between water/alky and water/meth.
what are you running for timing? right now im peaking at 21* in the 5000-6000 range then it stays pretty flat up to redline. might advance it more once the 400cc water/meth nozzle shows up..
12.33 @ 111.67 mph [Oct 2009]
Dyno'd on 08/02/09 - Mustang Dyno:
327.6 WHP 333.6 WTQ [10.1 AFR]
19* at 6400, All we can get in california is 91 octane. Thats on an m2 and m1 nozzle together.
BOOSTED BABY wrote:hey evilmonkitar...i was using that same stuff but then i switch to denautred alcohol and filled half up and then put half blue windshield washer fluid. Now its smells so good when i get on it. Try it.
You want a good smell...go 110 leaded race fuel and add a lil nitrous lol...
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4 Cams...32 Valves...5 Liters...This Could Get Fun!
ha yea, race gas does smell pretty good, makes my exhaust tip look like a pencil though..
do they sell the NOS octane booster in CA? you could always add some of that if you wanted to get higher octane..
12.33 @ 111.67 mph [Oct 2009]
Dyno'd on 08/02/09 - Mustang Dyno:
327.6 WHP 333.6 WTQ [10.1 AFR]
