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| LSJ Supercharged Ecotec Swap (Page 38/45) |
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wftb
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APR 21, 10:37 PM
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structurally , the fiero frame was one of the strongest of its era .and even today when people want to create a full out racing chassis , they usually dont have a full space frame style chassis like a fiero's to start with .i read an article about making an scca class racer out of a nissan 350Z and how they tore the whole car apart and stitch welded the entire unibody chassis .when i say stitch welded , that is not actually an accurate term as all the welds were continuous with no gaps at all .the cost was huge , but it doubled the torsional rigidity of the chassis .look at our space frame . it is only spot welded together and it is yet very strong .stitch welding a fiero frame would gain a lot of strength and not cost much if you did it yourself .
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Austrian Import
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APR 22, 04:19 PM
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That may be a project someday. It reminds me of the saying with Porsche 914 owners. "First you have to take the body off and finish welding it, as they never finished welding it at the factory."
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ccfiero350
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APR 22, 05:20 PM
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One of these days before I die, I'd like to build a tube frame car like a lotus 7. Something simple and quick. ------------------
yellow 88 GT, not stock
white 88 notchie, 4 banger
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Bridgetown
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APR 23, 07:30 PM
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| quote | Originally posted by Goldenfoot:
I believe the Atoms Ecotec had different cams. Another thing is that GM rated their supercharged ecotecs HP at the wheels to help lower insurance costs to buyers. I am assuming the Atoms is Crank HP. So a stock cobaltSS/Ionredline rated at 205 HP is just at the wheels. Crank would be closer to 230~. A stage 2 close to 270~. So for an Atom, smaller pully, different cams, better charge cooling and a tune to match would probably bring it into the 300HP range. Look on www.cobaltss.net They have some crazy mods to get some high #s out of their cars! |
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The internals of the Atom are the same as all the other LSJ's the "stage 3" setup consists of the injectors from the stage 2 upgrade and the following:
The Stage 3 kit consists of the following:
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• Smaller, 76mm supercharger pulley
• 2-pass intercooler end plate
• Unique PCM which includes a calibration for the smaller pulley, an adjustable rev limiter, a 100 octane mode, and a nitrous algorithm.
Our Stage 3 kit will take your supercharged Ecotec to a whole new level of performance. Stage 3 takes horsepower output to 248 on 93 octane fuel and to 260 horsepower on 100 octane fuel.
In addition to the power increase, you'll also get an adjustable rev limiter and calibration for a 50 shot of nitrous (nitrous kit not included).
For best power, we recommend also installing a high-flow exhaust.
The PCM is equipped with a user adjustable rev limit from 6750 to 8000 rpm. The rev limit is adjusted by pressing on the throttle pedal with the ignition on and engine off. At about 50% throttle the tachometer will show the current rev limit. Pressing the throttle further will adjust the rev limit in 250 rpm increments. This PCM is also equipped with a control scheme for the equivalent of a 50-horse shot of Nitrous. The PCM will automatically provide the proper spark and fuel for A Nitrous up to 500 rpm below the current selected rev limit when the trigger is activated."
I imagine that the extra power (260 up to 300) in the Atom comes from the better exhaust sytem.
I can verify that the Atom does utalize the drive-by-wire throttle body. Which means to use the Atom PCM in a Fiero one would need to use a Cobalt gas pedal. The Atom also uses a race type gauge cluster from SPA. The cluster is progamable for different inputs. As far as I have researched, all that would be needed to run the LSJ off the Atom PCM is the Cobalt pedal and the SPA gauge cluster. You might be able to get the Fiero guages to work too, but I'm not sure on that.
The Atom PCM is not technically a stand alone setup. It does not come with software to tune it. I think more or less it is the same as the Cobalt SS/Redline, flashed to a stage 3 tune, minus the need for the BCM. However, I know of at least one place http://trifectaperformance....pportedvehicles.aspx that can tune the Atom PCM. You can purchase the Atom PCM on the net for around $500. If you can do a bit of wiring, that's all it would cost to get the LSJ running in the Fiero. If not there's always enginewiring.com, they will build you a harness for around $325
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ccfiero350
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APR 24, 10:57 AM
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My LSJ is stock at the moment, and will run off a mefi4 controller. Once the car is running, I have all the parts for a stage 3 upgrade along with new clutch and alum flywheel and balancer delete.
I'd like to see a good solid reliable 260-280 hp with a stage 2 pulley for track days.
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yellow 88 GT, not stock
white 88 notchie, 4 banger
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Bridgetown
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APR 24, 01:04 PM
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Cc, do you have the me controller? I haven't heard anything from painless performance on it. I can't find anyone running one either. I'm curious how the base tune is on it, the Atom guys often complain about the tune from Brammo. The issues seem to be performance under hi temps. Mostly caused by an undersized heat exchanger in the Atom. When the temps go up, the tune starts to kill the power.
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ccfiero350
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APR 24, 01:56 PM
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Bridgetown
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APR 24, 02:15 PM
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Which version of the Brammo tune do you have? I think they had a stage 2 and 3. PM me about the ECU, I would be interested if the price is right. From what I have gathered, the heat soak problem can be solved by adding a larger heat exchanger (down low in front of Fiero cradle might be a good spot), adding a surge tank (available from GM called "option B") and upgrading the intercooler to a dual pass endplate. I have also read that it is a good idea to upgrade the valve springs on the LSJ in stage 3 trim, the stock ones are only good to around 6800-7000 rpm.
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ccfiero350
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APR 24, 02:47 PM
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I have a spot for a BIG radiator for the inter cooler up front and all the bits for the upgrade. Need to finish body repair first. See http://www.fiero.nl/forum/Forum2/HTML/098086.html
Brand new, still have the original box. Stage 3, if your in the business you know how nice it is to have one to exchange with, and one to hack.  Make me a reasonable offer.
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yellow 88 GT, not stock
white 88 notchie, 4 banger
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Bridgetown
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APR 24, 06:30 PM
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