So do we know of anyone who has used HPT to tune the ecotec with the GMPP supercharger. I think its pretty safe to say that no one, including HPT, will support the reflash. I wouldn't really care that it is locked, but suppose I want to install a ported head and cams down the road...
Basically has anyone bolted on the s/c and added larger injectors and created a reasonable tune? Before I commit, it would be nice to know that I have a starting point with respect to tuning.
Correct me if I'm wrong, but shouldnt tuning for a roots s/c be easier than turbo. There should be pretty much the same amount of boost generated in each gear across the map (TPS and RPM), unlike turbo, you do not generate more boost under higher load.
getting the base tune down is what scares people and they arent trying it, and if they are they are keeping it to themselves.
but i know people changing pulley sizes and using a fpr w/ great results.
myself included
im running a 2.9 w/ afpr and am 10.2-10.6 @ wot and it runs great @ 15-16 psi
I am currently running a tune of my own.
Stock Pulley 8 psi Afr 11.2-11.6 wot 14 degrees advance I love it. A few spots I haven't cleaned up where the car drops into the 10s at Partial throttle but besides that the tune is beautiful and I would be willing to offer a copy of my tune possibly. Just remember each car is different and with my tune you'd have to use my exact injector constant or its just all out of whack.
I think the biggest limitation with using the stock s/c ecu flash and fpr w/ high boost is lack of ability to change spark tables. This could be corrected with a piggyback system, I haven't heard of anyone attempting it that way.
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Mitsu TD06-20g |3" Downpipe w/ Cutout | 61mm Bored TB |
HP Tuners | Innovate WB02 | Spec Stage 3 | TurboTech Upper | Full Addco Sways | Sportlines & Yellows |
K. Vega,Now With Vitamin Boost wrote:I am currently running a tune of my own.
Stock Pulley 8 psi Afr 11.2-11.6 wot 14 degrees advance I love it. A few spots I haven't cleaned up where the car drops into the 10s at Partial throttle but besides that the tune is beautiful and I would be willing to offer a copy of my tune possibly. Just remember each car is different and with my tune you'd have to use my exact injector constant or its just all out of whack.
This is what I was looking for. Is this a street tune that you did via a wideband, or is this a dyno tune? I would have to use you constant AND the exact same flowing injectors AND run th same fuel pressure as you IIRC. Now that I think of all the variables, its probably best to "compare" a homeade s/c tune with a base tune just to learn what to change.
Also, its probably best, if the option is available, to install and tune the high flow injectors first, just so I know that the car runs and idles smoothly before adding the s/c and changing spark timing.
Hypothetical qustion for you - if you were to pulley down and up the boost just a little, all you would need to do is back off timing where you have predetermined to be in boost, and add fuel in the same corresponding fuel tables right? My impression is that it's a bit easier with the s/c than turbo because of the linear addition of boost...that is, adding an MBC to a turbo system and upping the boost may or may not result in an "accross the board" increase in manifold pressure, hence boost is a huge variable in tuning turbo system (duh), but not as huge in a s/c system.
Forgive me for thinking out loud, as I have no real life tuning anything except for a mass spectrometer
ok well I am running stock fuel pressure and the lsj injectors. This is a street tune via wideband yes. If you were to up boost it isn't about just pulling timing. You'd want to set up histogram tables to use. Each Engine is different. At a certain rpm 16 degrees advance may be ideal for me but not Ideal for you.
yeap, stock bottom end
it runs great, had the tech 2 plugged in and there no problem
how many miles/ do you have a cat?
Snowman wrote:getting the base tune down is what scares people and they arent trying it, and if they are they are keeping it to themselves.
but i know people changing pulley sizes and using a fpr w/ great results.
myself included
im running a 2.9 w/ afpr and am 10.2-10.6 @ wot and it runs great @ 15-16 psi
So are you running the GMPP reflash with an AFPR? What is stock boost like 8-10 psi? I've read that GM's tune is rather conservative with the ignition timing, but no one's offered concrete proof. I'm leaning more toward tuning it myself...
To Pull off 15 to 16 psi and daily drive the car if I believe that's what snowman is doing thats damn amazing which is why I'm curious about how long he's been running his set up.
Snowman is just awesome like that.
yea also 10.2-10.6 seems to be so rich I mean over on the cobalt forums these guys are talking about 10.0 - 10.x with their stage 2 setups. I guess Gm ran it that way for safety precautions but that to me just seems like it would be way to rich aka Gunky Exhaust Valves.Well actually what afrs are you running Out of boost ex. Idle and Low Load?
soory i havent replied, the car isnt driven daily, its a weekend cruiser.
ive been driving it like that for about a month.
yea its just the gm reflash and an aeromotive afpr and green tops. fuel pressure @ 55-58 @ idle(i cant remeber.)
heres some pics(i know the belts off)
2.9-----------3.2----------stock
and a short video, that i tried to record while driving/shifting, so its a lil bouncy
also the stupid autometer gauge is off by 2 according to the tech 2
idle is 20 in hg
and peak boost was 15
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15 psi won't last
I'm glad my second motor hasn't popped yet tho
Tuning the car with HPT is fairly easy on an S/C setup, the boost is very linear and easy to account for. It's basically like tuning the car as if it's a larger engine is all.
12.770 @ 111.99 Intercooled Eaton M62
Airtonics wrote:15 psi won't last I'm glad my second motor hasn't popped yet tho
Tuning the car with HPT is fairly easy on an S/C setup, the boost is very linear and easy to account for. It's basically like tuning the car as if it's a larger engine is all.
I saw the vids of your car, its effin sweet!! I use it to convince my more "cost motivated" and "younger" friends to go s/c instead of turbo!! So what happened with your first motor? Just more power than the stock parts can handle, or were you overspinning the blower -> heat -> detonation?
The only thing that kinda sucks about tuning it yourself is the cost - GM reflash is included in the cost of a new kit, but to tune it yourself you looking at least 800 bucks for HPT pro and a wideband...but thats life - comp blower cams wont tune themselves!
I rather know what is going on with my motor and tune it to what it Wants/Needs using histograms instead of using something gm made up using throwing darts and guesstimations.
Snowman can you please repost that video? I would like to see it!
FORGET GIRLS GONE WILD WE HAVE GOVERNMENT SPENDING GONE WILD!
how's that feel in your butt dyno btw?
it feels pretty damn good
not to mention the noise it makes...........i wish my camera recorded sound
what is your range of timing advance under WOT?
I ran the exact same setup as snowman for months with no issues. Only thing I did diff was add an inline pump to get the fuel up front faster.
ran 15psi all day long and loved it
i forgot to add i have a walbro 255 intank pump.
But i love it.......and if it blows ill build it up.
but tax return money = more fun stuff
possibly internals
