LS STOCK ECU TUNING INSTALL
LS STOCK ECU TUNING MODS
LS STOCK ECU TUNING FREE

So I went to the good people at OS Giken and inquired about a clutch and flywheel. That version of the S54 felt sluggish coming out of turns, and I attributed that to the 29.5 lbs of flywheel and clutch vs the 18.2 lbs of the Clutchmasters setup. I didn't want to suffer another engine failure due to a flywheel problem. When I installed it, I went with an old JB Racing flywheel I bought from Turner, mated to a Sachs heavy duty pressure plate and clutch.

That engine has been a reliable (so far) motor, good for some decent performance at Nationals and elsewhere.

LS STOCK ECU TUNING INSTALL

In a pinch, and before I knew the cause of the 2nd motor's demise, I opted to install an S54. It didn't spin up anywhere near as rapidly though, and my gut feel is that result was due to the long stroke. That motor had both more torque and power, which you'd expect from a 3.4 liter engine. (Note that the flywheel has been revised from them, so if you have the original 6-bolt version that had a small aluminum center section to which a steel outer ring was fastened with six socket head cap screws, remove that from your car *now* and replace it before your motor is destroyed.) Sadly, I didn't know the cause until we removed the flywheel to install it on the replacement motor, and only then did I see the original version of the Clutchmasters FX-650 flywheel was, um, *not* a good version. That motor died when the flywheel failed, leaving the motor wildly out of balance. We stuck with the ITBs and AEM ECU due to the proven results. The replacement motor for that was a cast iron block, using a stroked S54 crank, titanium rods and 13.5:1 compression ratio. I still wish I had that motor, though I wish I would've opted for the H-beam rods to withstand the redline I liked. It also used an AEM ECU that was modified to support single-Vanos. Oh - it had ITBs, running Metric Mechanic's adapter plates to make that installation a piece o' cake. It was the mechanical equivalent of a work of art. Pulling out of slow corners, it didn't feel like there was any torque working for us but it also felt like it just spun up without any resistance. It had a lightened crank, 13.25:1 compression (if I recall correctly), and was just an incredibly responsive engine. My co-drivers and I universally agree that our favorite engine was the 3.0 liter. I'd love to meet that other guy and talk shop with him! Huh - I wasn't aware there are *two* of us who've done ITBs on M5x/S5x engines, then gone to an S54 setup. JacquesIf you don't mind me asking, do you have a source for the adapter or are you making one yourself? I will be running the ITB plenum along with a 3.5' MAF and cold air intake, though I'd love to do an Alpha-N tune and delete the MAF, or maybe even go as far as converting to speed/density with MegaSquirt.Ĭan anyone provide any 1st hand or relevant experience? Any suggestions? I also have to get this thing through tailpipe sniffer emissions testing.

However, I'm concerned about wether or not I'll be able to successfully tune the engine for part throttle drivability as well as extracting max power from the engine. This system permits manipulation of many different engine management parameters. I have and am currently using a Miller WAR chip system in my red label 413 DME.

LS STOCK ECU TUNING MODS

There are plenty of other mods going into this build to go along with the ITBs. I'm currently building a motor for autocross and will be using Euro ITBs with an adapter on my S50 cylinder head.

LS STOCK ECU TUNING FREE

As long as you or your tuner know what they are doing you should have great success! That will free up more cash for other power parts. Brody has been very good about turning around these kinds of modifications for me, though. Miller does prevent modifying a few base tables that would allow you to make adjustments for different injectors. You can change ignition timing, fuel, and vanos switch point RPM. Tuning with a war chip is no different than using anything else to tune.

Adding fuel is easy to do with the WAR chip setup. You hopefully are letting more air into each cylinder. I don't have specific experience tuning ITB's with a WAR chip, but I do have a fair amount of experience with the WAR chip. As long as you tune it too maintain a certain afr thought the rpm range then you'll be fine! Euro motors have no problem on stock ecu's, so I cant see why your ecu with a War chip is even an issue of discussion. What makes you think having 6 individual throttle bodies is very different then have one larger one further up the intake tract?! Air is still entering the motor through the ports the same way w/ the injectors in the same position! ITB's are just individual butterfly valves in front of the ports as appose too have one bigger one.

Ls stock ecu tuning