Name : Codith Age : 37 Location : Villa Park, IL Joined : 2007-02-08Post Count : 3671 Merit : 140
Subject: Re: tortuga Mon Nov 11, 2013 12:52 am
Spun really bad the first run and still blew away my previous PB by over a second haha
2nd run was pretty trouble-free other than the KR and weird stuff right after the 2-3 shift but that was in basically every run for the most part. This is the fastest that had zero nitrous involvement btw and interestingly, my highest trap speed.
3rd run was pretty much a total flop. Pretty funny though that I matched my previous personal best coasting the back half haha! This one is also gonna be famous for the only time I've ever heard an eaton-powered car make a blow off valve noise!
I'm actually not sure if this is the 4th or 5th run because somehow I missed one of them. I'll check my scans and see if I can positively figure it out.
I dedicate pass number 6 to Eric's late whippled track-humping riv. I might have humped it too on this one! Yeah I started spraying on this run and then realized I forgot to arm the nitrous so I was just dumping a bunch of extra fuel into the engine without the nitrous spraying, then i realized, armed it and sprayed and yeah... Imagine what that scan looks like lol
All I can say is it's probably good they were finishing up for the day 'cause things were getting pretty stupid now. Hptuner sorta locked up on me as I was pulling up to stage so I just threw the aeroforces on last minute, then the track guy closed my hood for me... forgot to disable TCS, didn't turn on perfshift from what I can tell in the vid yeah... :dunce:I was done.
This car really took some weird shit today like a champ - that's all I can say
96_Juggernaut Fanatic
Name : Todd Balestrini Age : 41 Location : Beaufort S.C. Joined : 2013-07-08Post Count : 293 Merit : 5
Subject: Re: tortuga Mon Nov 11, 2013 2:42 am
I'm jelly
stan Expert
Joined : 2007-07-01Post Count : 2558 Merit : 12
Subject: Re: tortuga Mon Nov 11, 2013 3:00 am
that's it i'm taking Codith's car for a lap..haha....
J. Chris Davis Aficionado
Name : Chris Davis Age : 43 Location : Dixon, IL Joined : 2010-04-14Post Count : 1008 Merit : 19
Subject: Re: tortuga Mon Nov 11, 2013 9:24 am
Nice! I didn't see the posts till now. I live a half hour from Byron.
Abaddon Expert
Name : Scott Location : Macomb, Michigan Joined : 2010-02-24Post Count : 4316 Merit : 185
Subject: Re: tortuga Mon Nov 11, 2013 10:18 am
12.40....nice run. When you say you're running out of MAF, do you mean the engine is taking in more air than the MAF maxes out at?
turtleman Expert
Name : Codith Age : 37 Location : Villa Park, IL Joined : 2007-02-08Post Count : 3671 Merit : 140
Subject: Re: tortuga Mon Nov 11, 2013 1:02 pm
These snapshots are from the 2nd run
hitting the 1-2 shift
hitting the 2-3 shift
right after the 2-3 shift besides my refresh rate being so slow (see maf hz vs maf g/s) the maf just kinda stays there for a second like stuck at a number. When I spray, this same issue is amplified - happens a lot sooner. As soon as that happens, the PCM just goes wild with fueling and overbudgets the injectors it looks like
96_Juggernaut Fanatic
Name : Todd Balestrini Age : 41 Location : Beaufort S.C. Joined : 2013-07-08Post Count : 293 Merit : 5
Subject: Re: tortuga Mon Nov 11, 2013 1:25 pm
Can your scanner show injector duty cycle instead of pulse width?
turtleman Expert
Name : Codith Age : 37 Location : Villa Park, IL Joined : 2007-02-08Post Count : 3671 Merit : 140
Subject: Re: tortuga Mon Nov 11, 2013 1:34 pm
96_Juggernaut wrote:
Can your scanner show injector duty cycle instead of pulse width?
It's at the top of the chart display (line graph)
T Riley Guru
Name : Travis Age : 34 Location : Minnesconsin Joined : 2007-02-08Post Count : 5127 Merit : 10
Subject: Re: tortuga Mon Nov 11, 2013 2:47 pm
You were on Corn right?
AA Administrator
Name : Aaron Age : 47 Location : C-bus, Ohio Joined : 2007-01-13Post Count : 18452 Merit : 252
Subject: Re: tortuga Mon Nov 11, 2013 3:12 pm
Wow, 6800 RPM. Really moving some air at top of 2nd gear!
Nice runs, too. Mind if this gets moved to the Racing/Kills forum?
'70 Ninety-Eight Holiday Coupe 455cid • 116k miles ^^^ SOLD ^^^
stan Expert
Joined : 2007-07-01Post Count : 2558 Merit : 12
Subject: Re: tortuga Mon Nov 11, 2013 6:27 pm
Nice run
charlieRobinson Expert
Name : Charlie Age : 39 Location : Knoxville, TN Joined : 2011-05-17Post Count : 3924 Merit : 31
Subject: Re: tortuga Mon Nov 11, 2013 7:09 pm
AA wrote:
Wow, 6800 RPM. Really moving some air at top of 2nd gear!
Nice runs, too. Mind if this gets moved to the Racing/Kills forum?
Copy it, but dont move it! This is Tortuga history!!! It belongs here!
Sorry, Codith, dont mean to step on toes..
deekster_caddy Master
Name : Derek Age : 52 Location : Reading, MA Joined : 2007-01-31Post Count : 7717 Merit : 109
Subject: Re: tortuga Wed Nov 13, 2013 10:15 am
Awesome runs! Notice how your fastest ET goes along with your best 60' time. any 60' time under 2.0 is great!
turtleman Expert
Name : Codith Age : 37 Location : Villa Park, IL Joined : 2007-02-08Post Count : 3671 Merit : 140
Subject: Re: tortuga Wed Nov 13, 2013 2:36 pm
deekster_caddy wrote:
Awesome runs! Notice how your fastest ET goes along with your best 60' time. any 60' time under 2.0 is great!
Yeah with the DR's, it definitely still requires tactful finesse with throttle which I guess I have a hard time getting down but it's not hopeless feeling like it was with street tires. I never found the sweet spot.
deekster_caddy Master
Name : Derek Age : 52 Location : Reading, MA Joined : 2007-01-31Post Count : 7717 Merit : 109
Subject: Re: tortuga Wed Nov 13, 2013 3:06 pm
turtleman wrote:
deekster_caddy wrote:
Awesome runs! Notice how your fastest ET goes along with your best 60' time. any 60' time under 2.0 is great!
Yeah with the DR's, it definitely still requires tactful finesse with throttle which I guess I have a hard time getting down but it's not hopeless feeling like it was with street tires. I never found the sweet spot.
Go a few more times, and forget about the ETs. Just focus on your launch. Try different amounts of warmup, different pressures and different launch strategies. I was able to pull off a 2.05 60' on my street tires after a lot of futzing around. You should be able to get will into the mid/high 1.x for 60'. Let's see your ET after a 1.8.
turtleman Expert
Name : Codith Age : 37 Location : Villa Park, IL Joined : 2007-02-08Post Count : 3671 Merit : 140
Subject: Re: tortuga Thu Nov 14, 2013 1:08 am
I finished my northstar throttle body mill-mounting plate today. Not fancy but any time I reverse engineer anything, even bolt patterns, it's a big deal to me.
The first attempt. That is a full 78mm bore from 75mm. There's just enough material left around the main bore to support the rubber throttle body seal nicely. No apparent issues with the pivot shaft holes or anything.
I already made a lathe fixture that I'm going to cut the bigger butterfly from scratch with that's offset to duplicate the slightly oblong shape of the factory throttle blade. More to come with this.
turtleman Expert
Name : Codith Age : 37 Location : Villa Park, IL Joined : 2007-02-08Post Count : 3671 Merit : 140
Subject: Re: tortuga Mon Nov 25, 2013 1:04 pm
I'm running into some snags with the throttle body. Still workin at it though
The slot in the shaft for the throttle plate is actually long enough for the oversized plate but the ends pinch down in width so it still needs to be modified. After trying to file it with a tiny file, I said screw that and made a wEDM holder to burn out the ends.
That's the setup for that
The real problem is the plate itself. The original looks like it was stock rolled to its thickness of .080" and stamped out. I can't machine any aluminum to that size without it warping like a bitch. I'll have ~.005" variance pretty much as soon as I take anything off it. I tried machining the stock down with a boring tool kinda deal and I tried grinding it on a ground bed since our surface grinders are magnetic, both to no avail. I was looking online at aftermarket/modded throttle bodies and I see a lot are using brass throttle plates. If I can find some stock that'd work for me, I'll see how that works out. It's also kinda tricky to get the contour right since the original throttle plate is not round but I need to get flat stock before I worry about getting that perfect. So far though, I didn't really love how the first one cam out using the offset lathe fixture I came up with just calculating the L/W difference of the original butterfly valve. There's still a good amount of light showing around it when it binds shut. James gave me a really good idea to basically just have the flatstock mounted at a couple degree angle and just machine it circle to just fit in the bore so I end up with something that's round with angle outside edges that should work. That seems easier because then I just need to get the close angle right so I don't have to adjust the factory set screw or worry about the tps.
deekster_caddy Master
Name : Derek Age : 52 Location : Reading, MA Joined : 2007-01-31Post Count : 7717 Merit : 109
Subject: Re: tortuga Mon Nov 25, 2013 1:41 pm
Just a thought for you - I don't think it's a big deal if the throttle blade doesn't close 100%. We had to increase the throttle stop position on our N* throttle body because we couldn't get the idle right and it turned out the system was relying way to heavily on the IAC position. Being unable to adjust the stop position set screw, we simply bent the throttle bracket a little bit so that is gave a bit more opening. It resolved all of the wacky idling issues I was having - a lot of hunting going on for a smooth idle position. Now it starts better from cold and runs better all around.
So if you see just a bit of daylight, it might not be a big deal.
turtleman Expert
Name : Codith Age : 37 Location : Villa Park, IL Joined : 2007-02-08Post Count : 3671 Merit : 140
Subject: Re: tortuga Mon Nov 25, 2013 2:05 pm
deekster_caddy wrote:
Just a thought for you - I don't think it's a big deal if the throttle blade doesn't close 100%. We had to increase the throttle stop position on our N* throttle body because we couldn't get the idle right and it turned out the system was relying way to heavily on the IAC position. Being unable to adjust the stop position set screw, we simply bent the throttle bracket a little bit so that is gave a bit more opening. It resolved all of the wacky idling issues I was having - a lot of hunting going on for a smooth idle position. Now it starts better from cold and runs better all around.
So if you see just a bit of daylight, it might not be a big deal.
I wonder if that's contributing to the current behavior of my idle and whatnot with my northstar. I know for one thing there's always a discrepancy in iac steps to get a certain rpm if I look at that in hpt scanner. I actually tried changing the "iac flow per step" value in tinytuner before but it didn't do anything at all. I could put any crazy value in there and it didn't matter. I found some things in there just plain don't do anything. Anyway it's good to know I shouldn't have to be super critical about it. I noticed the LS1 throttle bodies which 3800 people have used also all have a little air hole in the butterfly even. So maybe my iac is just trying to do too much - like making bigger changes than the pcm anticipates...
matt270avian Expert
Name : Matt Age : 28 Location : Frederick, MD Joined : 2012-01-15Post Count : 2681 Merit : 54
Subject: Re: tortuga Sun Jan 26, 2014 11:21 pm
How much boost are you actually pushing? According to one of your charts you're hitting 30, but according to the other you're hitting 13.
Sir Psycho Sexy Junkie
Name : Tyler Age : 30 Location : Temperance, Michigan Joined : 2012-06-22Post Count : 948 Merit : 20
Subject: Re: tortuga Mon Jan 27, 2014 12:13 am
If you're hitting thirty...
turtleman Expert
Name : Codith Age : 37 Location : Villa Park, IL Joined : 2007-02-08Post Count : 3671 Merit : 140
Subject: Re: tortuga Mon Jan 27, 2014 12:49 am
matt270avian wrote:
How much boost are you actually pushing? According to one of your charts you're hitting 30, but according to the other you're hitting 13.
What are you looking at exactly with those numbers? I can't precisely say what my max boost is since my gauge range is to 15psi. With the 2.55 pulley, I usually peg it any time i go WOT but I'd guess not more than 16psi or so. Map sensor clips off at 200kPa as you can see in the scan logs so that doesn't tell me either. Spraying nitrous also adds a couple more psi to manifold pressure so during a run, I could easily be hitting 18psi. I'm gonna throw one of my mechanical boost gauges on one of these days and see.
matt270avian Expert
Name : Matt Age : 28 Location : Frederick, MD Joined : 2012-01-15Post Count : 2681 Merit : 54
Subject: Re: tortuga Mon Jan 27, 2014 11:21 am
I was going off of the 200kPa.
turtleman Expert
Name : Codith Age : 37 Location : Villa Park, IL Joined : 2007-02-08Post Count : 3671 Merit : 140
Subject: Re: tortuga Mon Jan 27, 2014 6:27 pm
matt270avian wrote:
I was going off of the 200kPa.
200kPa is 2bar or two atmosphere basically, but don't forget that's including atmospheric pressure so it's 1bar or about 14.7psi boost. But yeah like I said, The factory map sensor is limited to 2bar/200kPa so anything beyond about 14.7psi of boost is not recognized. Unfortunately, you can't just throw a 3bar map sensor in there because the pcm is calibrated for the 2bar and I haven't seen a way to alter that.
matt270avian Expert
Name : Matt Age : 28 Location : Frederick, MD Joined : 2012-01-15Post Count : 2681 Merit : 54
Subject: Re: tortuga Mon Jan 27, 2014 7:34 pm
Ah alright, makes sense now. If you do the math, 1 psi per .1" in pulley drop, you should be at roughly 23lbs. Lose a couple for port, exhaust, etc. and the law of diminishing returns, that puts you at about 17-18?