Slowbalt2000's s257 Stock Engine LE5 Build
#78
Senior Member
Edit: I am very mistaken see following posts....
For fun and because MCM did this with Miatas recently, I overlaid Slowbalts Supercharged LE5 on top of my Turbocharged LE5 as we're running similar boost levels, orange = SC, blue = TC. Dotted line = HP
I hit 17.5 psi at around 3,600-3,700 rpm, redline 6,500, max timing was only 9 degrees and have since added a few degrees after softening up the knock strategy. In real life on the street or track, that is another story and probably not as deceiving as comparing numbers like I am.
For fun and because MCM did this with Miatas recently, I overlaid Slowbalts Supercharged LE5 on top of my Turbocharged LE5 as we're running similar boost levels, orange = SC, blue = TC. Dotted line = HP
I hit 17.5 psi at around 3,600-3,700 rpm, redline 6,500, max timing was only 9 degrees and have since added a few degrees after softening up the knock strategy. In real life on the street or track, that is another story and probably not as deceiving as comparing numbers like I am.
Last edited by steelmesh; 11-09-2016 at 10:02 AM.
#80
Senior Member
https://www.cobaltss.net/forums/2-4l...ml#post7627365
I took points from the picture of the dyno graph in #63 and put it in excel, ignore the steps I did some lazy stuff
#81
Yeah that was my dyno pull.
Car was tuned at 20psi with the timing running off the end of the table so when it hit 26psi on the dyno, im almost positive it was pulling back some major timing, which is why my graph drops off so hard as soon as it spools.
I do appreciate you doing that though. Makes the graph much easier to read. Since youre in michigan maybe we should do some actual runs! Where do you stay?
Edit: I think you have my hp and tq flipped
Car was tuned at 20psi with the timing running off the end of the table so when it hit 26psi on the dyno, im almost positive it was pulling back some major timing, which is why my graph drops off so hard as soon as it spools.
I do appreciate you doing that though. Makes the graph much easier to read. Since youre in michigan maybe we should do some actual runs! Where do you stay?
Edit: I think you have my hp and tq flipped
#82
Senior Member
Yeah that was my dyno pull.
Car was tuned at 20psi with the timing running off the end of the table so when it hit 26psi on the dyno, im almost positive it was pulling back some major timing, which is why my graph drops off so hard as soon as it spools.
I do appreciate you doing that though. Makes the graph much easier to read. Since youre in michigan maybe we should do some actual runs! Where do you stay?
Edit: I think you have my hp and tq flipped
Car was tuned at 20psi with the timing running off the end of the table so when it hit 26psi on the dyno, im almost positive it was pulling back some major timing, which is why my graph drops off so hard as soon as it spools.
I do appreciate you doing that though. Makes the graph much easier to read. Since youre in michigan maybe we should do some actual runs! Where do you stay?
Edit: I think you have my hp and tq flipped
As for the graph flipped, I only took Torque points, it was labeled on the graph I think I got it right, what may have happened in my laziness I did Tq*RPM/5252 for the HP points, let me double check this work I think I see what you're seeing
#85
Senior Member
HP = (Tq * RPM)/5252
325 = (Tq * 6,300) / 5252
325*5252 = Tq * 6300
(325*5252)/6300 = Tq
271 = Tq
Like I said, something isn't right and I feel like I have overlooked something easy
#86
Senior Member
The tuner who helped with my dyno pulls said I should be running more timing especially since I have meth, basically he suggested false knock is my issue. I am tuning it with HPT, I haven't touched the stock knock strategy, sounds like I am ready to at this point in time. Turbo is a Precision 5558 (Werks turbo kit).
#88
The tuner who helped with my dyno pulls said I should be running more timing especially since I have meth, basically he suggested false knock is my issue. I am tuning it with HPT, I haven't touched the stock knock strategy, sounds like I am ready to at this point in time. Turbo is a Precision 5558 (Werks turbo kit).
#89
Senior Member
I was getting KR activity around 4k rpms, I did reduce some of the knock sensitivity after my dyno runs and now running max 12 degrees, with street pulls showing promise. The car is currently parked as I need to figure out my oil pressure issues, I am 18-20 psi hot at idle tapped off the block, 44 psi at redline is the major concern in addition to all of my lifters are ticking (when oil temps <140F), I still did the dyno pull in this condition and I totally expect the engine to fail just don't know when. Will need to get a pressure gauge on the head, and I am also assuming the Chinese 0-100 psi transducer is performing. Eautorepair suggests oil pump before bearings as the cause.
#90
You have knock sensitivity tables in the e67? Ima have to check that out. My buddy had a $15 oil pressure gauge on his ion and his was doing the same thing but no noticable noise from engine. Lmk if you want a cheap front cover/oil pump. Ive got a few laying around.
#91
Senior Member
You have knock sensitivity tables in the e67? Ima have to check that out. My buddy had a $15 oil pressure gauge on his ion and his was doing the same thing but no noticable noise from engine. Lmk if you want a cheap front cover/oil pump. Ive got a few laying around.
Right now planning out my garage and how to get the car in there to continue working on it through out our lovely Fall/Winter Michigan season. I am considering an LEA block from a 2012 regal, looks like I can get a very low mileage one for $500, swap over the LE5 bottom and top basically.
#93
Senior Member
I am totally with you if I am going to pull it all apart, along with valve springs and balance delete I think I'll be in a good position to start breaking my drivetrain (a positive indicator that I am moving in the right direction lol).
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