Some interesting tuning and dyno results!!
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Originally Posted by vaus
That's cool... I was just questioning possible variables. You still don't mention if Bill had access to a true wide band O2 sensor while tuning your car?
-- Ed
-- Ed
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Originally Posted by wssboard18
I have no idea if he had access to the o2 sensor or not. I assume what ever tools he used was enough to properly tune my car. I paid good money for the tune so I expect is was done properly and profesionally.
-- Ed
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Again... you asked if he used a wideband and I said I did not know. And now to answer your new question, Yes all the tunning was done on the street. He never said it was nessasary to dyno tune it. He said only if I wanted some fine tunning to gain another 5whp at the most to get it dyno tuned.
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Originally Posted by wssboard18
And now to answer your new question, Yes all the tunning was done on the street.
Originally Posted by vaus
Did you ever get the car on the dyno with Bill?
Ok... so Bill road tuned the car w/o a wideband O2...... makes a bit more sense, but I would still think he would shoot for a richer a/f rather than leaner for safety especially if he couldn't monitor it propperly.
BTW, there's nothing wrong with road tuning if you have the propper instrumentation... atleast an EGT gauge and a propper wideband. It seems that Bill didn't have access to these, so the tune was quite a bit off.
-- Ed
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Maybe there's something wrong with your car. I have the same VF22 setup as you do, except I'm still running the stock TMIC. I made 255whp on Gruppe-S's mustang dyno which reads about the same as Shiv's DD dyno. With Bill's road tuning. Do dyno tuning at all. Don't be so quick assume it was a lousy tune.
Last edited by Lurk; Dec 3, 2004 at 08:43 PM.
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Originally Posted by Lurk
Maybe there's something wrong with your car. I have the same VF22 setup as you do, except I'm stilling running the stock TMIC. I made 255whp on Gruppe-S's mustang dyno which reads about the same as Shiv's DD dyno. With Bill's road tuning. Do dyno tuning at all. Don't be so quick assume it was a lousy tune.
Good to hear someone step in... I was going to suggest that there may be a mechanical issue at play here, but thought I'd hold off untill someone with personal experience chimed in.
Since your car was running so lean on a tune that should be rich, I'd start looking for vacuume leaks in your intake plumbing, or maybe check out the injectors, fuel pump, FPR, fuel filter, etc.
-- Ed
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While weather does change certain things when it comes to car's behaviour, it will not affect the A/F ratios that much. Your car is more likely to knock during certain weather variations, which has mostly to do with the ignition timing, not A/F.
WRX uses MAS to deternine the airflow. Mass Airflow, which is volume times density. With outside temperature changing, the air density changes and volume stays the same. So, MAS readings chnage and your ECU compensates for that change. Plus, stock MAS has a temperature sensor in there. Tuning is tuning. Unless it is a race tune, I personally would expect to have my car tuned for year round performance. Not "winter" and "summer" tunes.
WRX uses MAS to deternine the airflow. Mass Airflow, which is volume times density. With outside temperature changing, the air density changes and volume stays the same. So, MAS readings chnage and your ECU compensates for that change. Plus, stock MAS has a temperature sensor in there. Tuning is tuning. Unless it is a race tune, I personally would expect to have my car tuned for year round performance. Not "winter" and "summer" tunes.
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Alex,
you're completely right about weather not effecting the a/f ratio... atleast not as signficantly as that dyno may imply. In my post, I was simply referring to total tuned power output being effected significantly with differing weather conditions. I also warned about tunes done in the winter or on a very cold night... as I've had experience with a winter tune that started knocking hard as soon as the weather warmed up.
-- Ed
you're completely right about weather not effecting the a/f ratio... atleast not as signficantly as that dyno may imply. In my post, I was simply referring to total tuned power output being effected significantly with differing weather conditions. I also warned about tunes done in the winter or on a very cold night... as I've had experience with a winter tune that started knocking hard as soon as the weather warmed up.
-- Ed
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Originally Posted by Lurk
Maybe there's something wrong with your car. I have the same VF22 setup as you do, except I'm still running the stock TMIC. I made 255whp on Gruppe-S's mustang dyno which reads about the same as Shiv's DD dyno. With Bill's road tuning. Do dyno tuning at all. Don't be so quick assume it was a lousy tune.
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I am no expert here, but this is what I noticed:
In your I-speed tune, your max boost is around 16.8 psi
In your Vishnu tune, you max boost is at 18psi
One psi of boost can make a huge difference
Maybe bill@I-speed road tuned your car on the safe side
And Shiv@Vishnu retuned your car more aggressively by raising the boost pressure a bit??
Again, if I am totally wrong, please forgive me…I am just wondering about the difference
In your I-speed tune, your max boost is around 16.8 psi
In your Vishnu tune, you max boost is at 18psi
One psi of boost can make a huge difference
Maybe bill@I-speed road tuned your car on the safe side
And Shiv@Vishnu retuned your car more aggressively by raising the boost pressure a bit??
Again, if I am totally wrong, please forgive me…I am just wondering about the difference
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Originally Posted by broom_dude
I am no expert here, but this is what I noticed:
In your I-speed tune, your max boost is around 16.8 psi
In your Vishnu tune, you max boost is at 18psi
One psi of boost can make a huge difference
Maybe bill@I-speed road tuned your car on the safe side
And Shiv@Vishnu retuned your car more aggressively by raising the boost pressure a bit??
Again, if I am totally wrong, please forgive me…I am just wondering about the difference
In your I-speed tune, your max boost is around 16.8 psi
In your Vishnu tune, you max boost is at 18psi
One psi of boost can make a huge difference
Maybe bill@I-speed road tuned your car on the safe side
And Shiv@Vishnu retuned your car more aggressively by raising the boost pressure a bit??
Again, if I am totally wrong, please forgive me…I am just wondering about the difference
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That’s true, it’s interesting that you got less hp than before the vf22 upgrade
(I dynoed 233whp@ Vishnu with my vf29,STi TMIC, uppipe and catback)
I am just wondering how the road tune work?
I mean, what did Bill do to tune your car? WOT runs on the street?
(I dynoed 233whp@ Vishnu with my vf29,STi TMIC, uppipe and catback)
I am just wondering how the road tune work?
I mean, what did Bill do to tune your car? WOT runs on the street?
Thread Starter
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Posts: 162
From: north bay, CA
Originally Posted by broom_dude
That’s true, it’s interesting that you got less hp than before the vf22 upgrade
(I dynoed 233whp@ Vishnu with my vf29,STi TMIC, uppipe and catback)
I am just wondering how the road tune work?
I mean, what did Bill do to tune your car? WOT runs on the street?
(I dynoed 233whp@ Vishnu with my vf29,STi TMIC, uppipe and catback)
I am just wondering how the road tune work?
I mean, what did Bill do to tune your car? WOT runs on the street?