ok so i finally pickd up an 03 ecu for my 04 with the gm flash. i will be switching it over along with the stock map and stock injectors.
im reading the FAQ on hpt's site
Note: in the pics below the stock values are shown for a calibration (12216489) that requires the tables in Step 3 & 4 to be changed.
Step 1: Change the RPM limits to whatever you want
Step 2: Change the Speed limits to whatever you want
Step 3: Raise the spark ramp out values so spark does not decrease at high RPM/Speed (not required for all calibrations)
Step 4: Raise the TCS High RPM/VSSvalues so that 1,2,3,4 cylinders do not fuel cut at high RPM/Speed (not required for all calibrations)
what exactly does the step 4? and with step 3, wouldnt that be a little bit of good thing pulling spark at higher rpms and high boost levels (insurence reasons)
i guess what im trying to ask is, if i just move the limiter to say. 7300-7500. and flash it. does it automaticly have fuel and spark tables past the factory 6500 limiter? or does it have to be made like a base map for an ems?
i have the hahn porfueler, so fuel isnt an inssue for me.
my sole purpose for buying hpt will be to rev higher and possibly take advantage of the comp turbo cams im looking at.
i found what i wanted to know about the speed limiter on hpt's site in a sticky. (thanks shifted)
but i dont want to drop 500 on this and have a huge headache just trying to increase revs. there is NO ONE that i know of using in person or in my area online. so id be sol with problems.
at what rpm does the hpt scale max at? is it 8000?
also, why should PE be set to 0? shouldnt it be around 2500-3k? again please bare with me. its almost 2 am and iv been reading through the hpt posts here and on their site and i keep finding differnet info
off the hpt site.
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its actually a simple procedure, however after the stock rev limiter there are no timing/fuel maps i belive, so you have to create your own
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There is no way to create your own maps.
Limiters are pretty simple to change. You just type in new #s. But in most instances, there are multiple limiters on different pages that all need to be changed. How many and where are slightly dependent on what year and engine.
i dont need to fake a 2 map, i dont need to change injector sizes, just help on going rom 6500 7000/7500
this is on an 04 eco 5 speed with an 03 5 speed ecu. if that helps
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Just so you know theres no benefit in going past 7000 if your using comp cams or stock cams, they arent designed to flow past that, besides on a turbo car your going to get all your power between 4-6k
You can adjust fuel to 7000rpm
You can only adjust spark up to 6500
Back in the day when HP tuners first came out and there was no spark rampout feature when you went beyond 6500 it simply cut the advance and produced a rich condition, now that the rampout feature exists and you bump it up to match your rev limiter it simply repeats whatever was in the last cell, as far as I know the only way to adjust beyond that is with an msd, but thats only one adjustment
Say your running 17 degrees at 6500 and thats fine your not getting any knock, your AFRs are good and you rev to 7000 and now your getting knock, with the msd you can pull back a few degrees, say 3, this means that from 7000+ your running 14 degrees knock, but say you go even higher to 7500 and now your getting knock again with that 14 degrees, theres no way to adjust it down at 7500 but keep it the same at 7000
Your best bet is to set it at 7000, get an MSD and use HP tuners to Log your AFRs and tune your spark advance, you can use the logs from HP tuners to tune your fuel with the Portfueler
1989 Turbo Trans Am #82, 2007 Cobalt SS G85
Set PE at zero so that its always running, and not having to kick in at a certain rpm window.
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Just so you know theres no benefit in going past 7000 if your using comp cams or stock cams, they arent designed to flow past that, besides on a turbo car your going to get all your power between 4-6k
the cam specs are from 3-7k.
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You can adjust fuel to 7000rpm
You can only adjust spark up to 6500
so what happens if you go over 6500 or 7000 with fuel only going to 7 and spark going to 65?
i thought pj and owen have both been to 7500?
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Vincent Morris wrote:Set PE at zero so that its always running, and not having to kick in at a certain rpm window.
Its not always running, its just ONE of the MANY prerequisites that needs to be satisfied before the engine goes into PE. You also have to be at a certain TPS to start PE. You wouldn't want your car running PE all the time, it would bog at low RPM's and get very poor gas mileage, kill your cat, etc.
John-
It uses the last value in the cell (the one at 6500 RPM) for all RPM's above 6500.
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John-
It uses the last value in the cell (the one at 6500 RPM) for all RPM's above 6500
so for spark and fuel it uses the last value?
so i could just move the rpm limiter to 7 or 7300 and be fine? (fuel is taken care of via portfueler)
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Listening. I am also wondering this.
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John H [CavalierKid wrote:]Quote:
John-
It uses the last value in the cell (the one at 6500 RPM) for all RPM's above 6500
so for spark and fuel it uses the last value?
so i could just move the rpm limiter to 7 or 7300 and be fine? (fuel is taken care of via portfueler)
Yeah, it uses the last value in the cell for all values above that RPM. Provided the minimum spark is lower than the spark value in that cell.
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Yeah, it uses the last value in the cell for all values above that RPM. Provided the minimum spark is lower than the spark value in that cell.
what if i change the cams out? where it will require more fuel past 6500. wouldnt that cause a lean condition?
how are pj and owen getting around it?
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Since you would be using the portfueler, I wouldn't worry about it. I don't think Owen and PJ are getting "around" it, they are using it as is.
im just saying... i have several thousand in this motor.. so im tryin to find out all i can before i just start changing stuff. at 26psi it wouldnt take that much of a lean spike to do some serious/deadly damage.
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Shifted wrote:Since you would be using the portfueler, I wouldn't worry about it. I don't think Owen and PJ are getting "around" it, they are using it as is.
as far as fuel control, the car tends to run richer and richer the higher the RPMs go
since VE falls off at higher RPM.. my torque peak is 5200rpm so from there and higher, VE goes down.. if it repeats the last cell value, the air/fuel will simply get richer since the falling VE can't be compensated for by the ecu
as for spark advance, boosted cars dont have to worry about it, but for all motor I have a method that has yet to be tested to have spark advance all the way up to whatever RPM you want to, even with HPT.
and this is using a DIS piggy back system, that normally only does spark retard. What I'm planning to do is taking advantage of the HPT limitation of repeating the final cell in the spark advance table, and advacing the living hell out of it.. and then use the MSD to retard the timing back to normal at the same time, yet slowly release the MSD retard to act as an ignition advance.
just think, I've run almost 13s with 1100rpm of no spark advance.. acting almost as a limiter.
and I've hit 7700rpm before bouncing off the limiter.. all on the stock bottom end. If you have the flow mods to back up the higher redline, the car will scream
when i get the MSD situated, and the ITBs installed, I have a feeling the 8195rpm limitation in HPT may become a bother... 8000rpm FTW
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as far as fuel control, the car tends to run richer and richer the higher the RPMs go
since VE falls off at higher RPM.. my torque peak is 5200rpm so from there and higher, VE goes down.. if it repeats the last cell value, the air/fuel will simply get richer since the falling VE can't be compensated for by the ecu
as for spark advance, boosted cars dont have to worry about it, but for all motor I have a method that has yet to be tested to have spark advance all the way up to whatever RPM you want to, even with HPT.
cool so it would run a wee bit on the richer side up top. better then lean. i can always back fuel out via portfueler if needed.
so spark also stays the same based on the last setting, it doesnt start retarding timing once 6500 is passed?
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and I've hit 7700rpm before bouncing off the limiter.. all on the stock bottom end. If you have the flow mods to back up the higher redline, the car will scream
well i have enough boost to flow enough air in. just have to change the cams to move the powerband.
hope this isnt too much but can u post a screen shot of hpt of u making the rpm/spark changes as well as PE?
http://www.myspace.com/15102113
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so spark also stays the same based on the last setting, it doesnt start retarding timing once 6500 is passed?
nope, it just repeats the same value over and over again until the HPT limit of 8195 or whatever is the max rpm
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hope this isnt too much but can u post a screen shot of hpt of u making the rpm/spark changes as well as PE?
i'll post those up in a day or two
bump for pics please guys..
i went back to the stock map and ecu, so im ready to order this NOW.
just wanting to make sure what exactly is needed to move the redline up and the speed gov.
http://www.myspace.com/15102113
lol i forgot all about this
its gonna rain today so I'll do it when i get home
pinky swear!
shifted's page has some details about how to do this as well
1989 Turbo Trans Am #82, 2007 Cobalt SS G85
