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51
Motor and Drivetrain / Re: I want it i need it.....its time
« Last post by fabr on April 05, 2024, 10:34:23 AM »
I believe that Wichita Dyno and most shops as well tune mostly for idle and WOT such as is seen drag racing.That is pretty easy and quick to do. The attention to tuning part throttle and at various loads is very time consuming and therefore not much attention is given . All that is needed is smoothing of the cells to a nice 3d shape and it will run -OK. When the engine is usually at varying throttle and loads like we are then it becomes a bit more necessary to tune across the board so to speak.   Got home and went for a ride. Ran poorly part throttle.When I opened the tune up I found Chris had left a cell empty in the middle of the grid. It created a big funnel shape that covered the center of the grid.How/why that happened is anybodys guess but it damn sure should not have left the dyno like that. He only spent about 2 hours on the dyno. He did give me a discounted price since it usually takes 4-6 hours or so.  It was nice to see what the wheel HP was though.
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Motor and Drivetrain / Re: I want it i need it.....its time
« Last post by fabr on April 05, 2024, 09:53:48 AM »
I'm not a fan of open loop tunes like a lot do.
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Motor and Drivetrain / Re: I want it i need it.....its time
« Last post by DeepBusch69 on April 05, 2024, 08:51:07 AM »
 5:  fxxk
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Motor and Drivetrain / Re: I want it i need it.....its time
« Last post by dsrace on April 05, 2024, 08:48:23 AM »
I agree a wedged in 02 isn't the most accurate but better then nothing / close enough.   So it seems to me that an 02 sensor along with a flex duel sensor was added to Glenn's yellow rail about the same time. His exh was short like db69's and I seemed to remember being able to see the tip of the 02 inside it.  That is an inherit problem with a rear engine build. I'm sure there's a solution as well. 

Wichita dyno, I've heard good and concerning remarks from a large number of people. Nothing horrifying but some praise.  Where I do agree live tuning takes longer but gets you on the mark, w/o an o2 sensor thats just not possible for engine builds like outfronts.  A trip to the dyno for a very very conservative tune and thats it.
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Motor and Drivetrain / Re: I want it i need it.....its time
« Last post by fabr on April 05, 2024, 08:06:36 AM »
Quote from: dsrace on April 05, 2024, 06:44:34 AM
Quote from: fabr on April 04, 2024, 06:14:30 PM
10" exhaust rules out using an O2 sensor for sure. Tuning is at best a guess though without one,IMO.

Wonder if dyno shops have a strap on 02 sensor the mount to the ext tip? They have to have some way of working around that or atleast i would think so.
If you are talking Wichita Dyno then yes they have a tailpipe O2 sensor to put up the tailpipe as most tuner shops do.  Will it be accurate with a short pipe? Not IMO. Damn sure will not be accurate if just at the tip. It needs to be as far up the exhaust as the sensor can be placed . FWIW,I would never consider running without a decent length pipe that can have a properly located O2 sensor unless running alpha n.

On a side note,I will not likely be using Wichita Dyno again after my last tune.

Chris is a nice guy and easy to deal with BUT, the tune was crap. I had to do it over to where I had it before I took it to him. IMO,a proper exhaust with an O2 sensor and logging in the real world is the best way.
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Motor and Drivetrain / Re: I want it i need it.....its time
« Last post by dsrace on April 05, 2024, 06:54:53 AM »
When you sent the motor in for this work, did they install dished pistons to reduce comp ratio? I ask because I thought you said a while back that it was basically an n/a motor that boost was added too. 

No matter what your existing tune will be just fine for a base map. Im just trying to wrap my head around why John wouldn't sell you the tune.

With all the work you had done, do they rate the motor for say 20 psi or 25 psi boost??  ;D  ;)  if 1t is fun then 25 is better  :m
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Motor and Drivetrain / Re: I want it i need it.....its time
« Last post by dsrace on April 05, 2024, 06:44:34 AM »
Quote from: fabr on April 04, 2024, 06:14:30 PM
10" exhaust rules out using an O2 sensor for sure. Tuning is at best a guess though without one,IMO.

Wonder if dyno shops have a strap on 02 sensor the mount to the ext tip? They have to have some way of working around that or atleast i would think so.
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Motor and Drivetrain / Re: I want it i need it.....its time
« Last post by dsrace on April 05, 2024, 06:43:05 AM »
Quote from: DeepBusch69 on April 04, 2024, 01:41:22 PM
I agree DS and I should have been more clear with my post.  I just want a "base" tune to be half way close when I do go to a tuner.  I don't have an O2 sensor and the exhaust is only 10" long.  I just didn't want to start with a blank slate.

Ok, if your taking it to get it tuned then your current tune is your base tune. Just tell him what work was done to the motor and that you want it tuned for how ever much boost and set the wastegate for that.  You may want to know what size injectors your running and a data sheet showing dead time/flow on them......if possible. Not sure he needs that or not. BrianN had his suby dyno'd there and might remember what he wanted.

 I thought you meant that you wouldn't have time to get it to the tuners shop ( chris at witching dyno?) And just wanting to try mikes existing tune.
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Motor and Drivetrain / Re: I want it i need it.....its time
« Last post by fabr on April 04, 2024, 06:15:53 PM »
db69,do you know if Glenns car had an O2 sensor?
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Motor and Drivetrain / Re: I want it i need it.....its time
« Last post by fabr on April 04, 2024, 06:14:30 PM »
10" exhaust rules out using an O2 sensor for sure. Tuning is at best a guess though without one,IMO.
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