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GTHound, I have .bin files for 1989 GM 2.0L turbo (LT3), 1989 GM 3.1L turbo (LG5) and 1995 GM 3300 S/C (L67). The LT3 engine is a SOHC designed by Opel. I can scan in the 3D timing tables for these engines and either email or post them here. Let me know if you are interested.

For a starting point on my GM 2.8L V-6, I am going to use the ECM from an 1989 GM 3.1 V-6 turbo. For comparison here is a comparison of timing for a 3.1 N/A at 100 kPa manifold pressure and a 3.1 turbo at 130 kPa (4.3 psi of boost): RPM N/A Turbo 400 17.9 17.9 600 17.9...

I did some runs with DynoSim5 to look at cylinder pressures. Mind you I made some assumptions on the cam specs to match a baseline N/A model to advertised HP for the Opel engine. Here are the gross indicated cylinder pressures in psig. These are the average for the compression and power...

I just had a short talk with a rep at NeuMotor. The torque constant for a motor is solely a function of the KV. The KV is determined by the number of poles and how the motor is wound. If the torque requirements for the load is known then the motor constant can be used to determine the amps...

17 kW is 22.8 HP. T=HP*5252/rpm. So 22.8 HP at 85000 rpm is 1.41 ft-lbs which is 1.91 newton-meters. The torque constant (nM/amp) for a BLDC is approximately Kt = 8.3/KV. The Castle 1721 is a 2400 KV motor so the torque constant is approximately 0.00346 nM/amp. For comparison various high...

Got back home from vacation and found an error in my spreadsheet that was over predicting air flow. So I went ahead and built of DynoSim5 model of a 2.0L push rod engine like the Opel GT. The base case N/A model predicted 97 HP at 4500 rpm which is close to what I can find on that engine. The...

If the compressor is a GT3582R it needs to run at about 58000 rpm to make 7 psi of boost flowing 21 lbs/min of air. 21 lbs/min is what I estimate for 2.0L push rod engine at 5500 rpm. I’m riding in car right now and don’t have access to the software needed to estimate kW required. At 85000...

What compressor are you intending to run?

Interesting thought on honing. I'm also thinking about trying an adjustable reamer. I ordered a short 3/8" shank 1/4" HSS boring bar today and a piece of 3/4" 12L14 cold drawn round bar. Let the games begin!

If you have some interest in Fieros, check out the tech forum on Fiero.nl. Lots of interesting stuff. I own four Fieros and am looking to downsize: 1984 - 1992 GM Quad 4 2.3L Quad 4 DOHC 190 HP 1986 - original 2.8L V-6 1988 - 1992 Cadillac 4.9L V-8 200 HP 1988 - 1994 Buick 3800 S/C M62 Eaton...

An LMT 2280 is a 2 pole motor so running at 75,000 rpm is only 75,000 erpm. The MGM ESCs are rated for 200,000 erpm. APD ESCs are rated at 750,000 to 1,000,000 erpm. How can APD rate the ESCs for these high numbers if switching losses are a big problem? There is nothing in their documenation...

My target vehicle is a 2.8L V-6 in a 1986 Pontiac Fiero. This is a push rod engine that makes 140 HP at 4800 rpm. I have modeled it with DynoSim5 with a high efficiency centrifugal supercharger. With 10 psi of boost the inlet acfm is 306 at 5500 rpm redline. This equates to 21.6 corrected...

I am just a hobby machinist but I know that a concentric hole cannot be bored with a 3 jaw chuck. Even with a 4 jaw, it would be difficult to center the work to get accuracy in 0.0001" vicinity. I recently acquired a vintage Mikron T90 lathe. This is a high precision Swiss lathe. The work...

Garrett clone T04e-50 turbofor $159...

Upon further reaearch an LMT 2280/5 motor and an MGM 25063-3 ESC look promising. LMT has an option for a carbon fiber sleeve on the rotor to extend the RPM range. It looks like this motor could do 9.3 kW at 73000 rpm with a 50 volt supply drawing 200 amps. The peak amps look to be 400...

You need to match the motor power output to the power requirments of the supercharger. If you pick a motor what puts out 5 kW of power at 75,000 rpm but the supercharger consumes 10 kW of power at 75,000 rpm the motor starts to stall. The amps go through the roof and something burns up...

I can't speak for Castle but on a NeuMotor the maximum voltage is a limit to keep from spinning the motor past its rated EPMs. The problem with low voltage is that the amperage for a large kW motor is going to be high and that means a more expensive ESC and also lots of batttery capacity to get...

A Garrett T04E-40 compressor wheel would be a good fit for a 2.0L engine. There are Chinese clones on Ebay dirt cheap. At 6000 rpm I'd estimate about 19 lbs/min of air flow with 5 psi of boost. The compressor would demand about 5.7 kW from the motor. The required rpm would be about 73,000...

I am interested in this approach. I looked at Garrett T04E clones on-line and they are dirt cheap. They are a nice fit for my 2.8L V-6 pushrod project. Was the final sizing of the bore done with a boring bar or an adjustable reamer?

So the extension shaft is dual diameter? The large diameter section was bored to make an interference fit over the motor shaft?