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It seems to be similar in capacity to an EVO3 16g, obviously, but if these back pressure numbers are right, the turbine side is a vast improvement. When I ran 10.31 at ~130 on an EVO3 turbo in my Talon, airflow was 42 lbs/min at 19-20 psi at redline, but back pressure was 40-80 psi depending on...

I'm asking the turbo for all the boost it will make up top, but limiting it to around 23 psi peak to keep this gobshyte fuel system happy. Airflow is in the mid 40s. Boost at the top of the rpm range did drop a few psi after porting the head, which is just another indicator that the comp wheel...

The cat seems to be physically intact, but who knows what condition it is in. I'll take a closer look when I get it out. Either way I'm sure this is the biggest restriction currently on the car. Not exactly a huge surprise, but good to see numbers put to it. The airflow through the motor seems...

The whole reason for this test was suspecting the cat was damaged. It was on the car when the motor blew last year and put a bunch of oil and water through it while it was nice and hot on a pass. Exhaust is pretty much the only bolt on I haven't done yet, and I'm not surprised that it's holding...

I was expecting that much with zero back pressure from the exhaust. Still seems crazy to me after sleeping on it. Got a downpipe coming tomorrow, we'll see what that does to both pressures.

I checked on turbine back pressure tonight. Back pressure peaked at 42 psi, no matter what I did. Not at all what I expected. With a measured 15 psi in the downpipe that puts turbine ER around 2:1, which is really impressive since compressor PR is around 2.5:1. This tells me there must be more...

Has anyone here measured the back pressure on the stock exhaust? I tested my car today and was surprised by the results. 14 psi by redline. Dropping the cat back yielded the same result, so it's in the downpipe. Considering the expansion ratio this turbine must run, that seems like too much back...

I built my own motor last year. I did do the CSS from CNCwerx, and machine work was done by the shop I use for every motor I build. I think it was worth it for the peace of mind alone. I do everything I can in the tune to avoid LSPI, but it's still nice to know I've got some stronger parts in...

High 11s is moving, and that's a lot of passes. Sounds like a good time. :)

Mine did blow, and I still love the car. I'm actually surprised how much I like. I got it just because it's 4 banger turbo, RWD, and auto, which combines all of my favorite things in life, and to play around with the tune for something different. I really fell in love with it over the last year...

The main problem with the rods is that these days they build them just strong enough, with just enough overhead to provide a comfortable margin of error at stock HP. I think they've gotten TOO good at reducing variability, and can now really narrow down those margins and save money. Gone are the...

Hey, it was only excessive for #2. :D

Mine failed on 2. Why do I always have to be different.

Thanks for sharing! Glad they took care of it for you. I wouldn't be surprised to find that the HPFP changed. I swapped mine last year out of frustration with a misfire-like problem that just could not be resolved. The pump did it. I assumed I just had a weak one initially, but it is entirely...

My clip fell down into oblivion as well. A quarter inch E clip fits.

Torque by airflow is just the assumption that airflow is horsepower, and with rpm, you can get torque. Airflow is easy enough to get. The ECU provides it's calculation, which can be corrected against the WBO2, or you can calculate airflow yourself from the WBO2 and fuel flow. Airflow at 100% VE...

I can't see the timing mark from this angle. And all of the threads being black doesn't help determine how you're doing with the heat range. Porcelain coloring, or any other AFR determinations need to be made with only the conditions in question run on the plug. For example, kill the engine...

I can tell you've never been to court for this. :) There is no dB limit given in MA, or test procedure, except for motorcycles. MGL Chapter 90 section 16. This is interpreted by the courts and police as in reference to the OEM exhaust. For a while it specifically said so, but the unintended...

Got a quick log on the way home. 2166 rpm, ~9 psi boost, 28% throttle. The math says that VE comes in at 97%. Not that bad. Calculating torque by airflow it's 270 ft lbs. Using the standard 5 ftlbs per psia per liter it's 276 ft lbs. That's a BMEP of ~19 bar. Requested torque this time was 250...

I just checked requested torque at ~1750 rpm, 10.75 psi, part throttle cruising on the highway in 6th gear. The requested torque on the AP was much higher than my estimates in this thread, but about 100 ft lbs. 329, vs about 230. That would be a BMEP of ~23 bar, which I find hard to believe...