Stratton we've actually had this conversation before.
http://www.sr20-forum.com/216261-post161.html
Although no real answers were given then. The difference between my setup and yours is actually basically explained in
post #18 of the thread we're in now.
You used 15 psi and that's going to give your high torque number. However you ran into restrictions and other factors later on in the rev range that limited you to 303 WHP. I'm using 10.6 psi (and that's where my low torque number comes from) and I have less resctrictions and heat soak later on in the rev range so I make 303 WHP with that 10.6 psi. (I know you have S4s but I have a lowport head, higher static compression and arguably superior intake and exhaust plumbing).
Originally Posted by
PWRDbyUNCLEbens Don't you usually get less torque when you advance the timing?All else being equal,
proper timing will increase power/torque. The torque figure differences Stratton is talking about isn't really related to ignition timing. The peak power numbers however likely are. Good timing up top gives high power numbers and maybe that makes the torque look low in comparison?
Originally Posted by
PWRDbyUNCLEbens I know Ben likes to tune to the very edge so that may be why the torque is so low (compared to the hp)I'd put it differently, but this is basically the case. I like to do as much as I can so I don't have to run high boost numbers. I'll optimize everything else before turning up the boost. So I'll stretch 11 psi further than most.
That being said, I still don't have the timing for my 9.5:1 engine down properly yet. I've been much too aggressive in the past and I've gone back to square one. That 303 WHP tune was not engine-safe at all and I'm doing what it should take to get the efficiency back without going to extremes with timing. I've been screwing up big-time with my engine lately and it's been a hard learning experience because things went so well with this very same methodology for the BMW and the 8.5:1 DET in the S13. As this molasses train keeps moving I'll be letting everyone know how it goes.