Quote:
Originally Posted by M3Post
Greetings Bakerboy, and welcome to the Harrop SC club. 430whp is low for an S65 V8 M3 with a Harrop SC. Heck, some are putting 400whp down without an SC and full bolt-ons. Don't worry though, with the help of this board, Harrop and no doubt Mike B' at BPM, we can figure it out. I had a heck of a time getting mine to work properly and that was due to a bad bypass valve controller ECU motherboard. But enough about that. Back to your situation.
If you find no boost leaks, then tell us what boost the system is making when the Bypass Valve is fully open. I'm embedding a photo of where to tap the boost using a standard threaded fitting. I personally suspect that the Bypass Valve is not opening properly and the system is not making full boost. Try recalibrating the Bypass Valve Actuator as described in the Harrop install guide. Make sure that when the gas pedal is at WOT that the Bypass Valve Acuator fully opens and stays open.
Without going into a long story, I put mine on the dyno to check this, and then stood peering into the engine bay and made a video of the Bypass Valve operation, when I had problems. I wouldn't recommend this for most folks, but it is one way to check normal actuator operation.
If the boost signal is below 6.0 to 6.3psi then full boost is not being achieved and hence the WHP numbers are down.
Step 1: Recalibrate Bypass Valve
Step 2: Check Bypass Valve is opening all the way at WOT
Step 3: Do at same time as step 2 - tap the plenum at the port and measure the boost with a gage
It's also possible the Bypass Valve Actuator Controller CPU is "bad". I had to get mine repaired, while waiting for Harrop to express ship a replacement. Which they did. Just as an FYI - The Harrop Actuator Controller CPU is contained (installed) in the DME-ECU plastic box near the firewall.
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Awesome reply m3 post!
I did upload the supercharger calibration if that’s what you mean? I Did this myself.
As for the test you talk about checking for the arm moving on bypass, does this have to be performed on a dyno or can you do this static by revving engine?
Noted on the boost it should be, does it steadily increase then with revs? The car is phenomenal low to mid then top end felt slightly flat, which would explain that.
Also what was up with the motherboard on yours, anything worth looking for?
Thanks for your reply.