Turbo Tuning and Wastegate on a Dyno vs. Street?
09-09-2002, 07:30 PM
#1
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Turbo Tuning and Wastegate on a Dyno vs. Street? Anyone tune a Turbo on a Dyno with a Wastegate and found their boost changes when on load on the street? Do you see less boost on a Dynojet vs. under load on the street?
How do you tune if it keep changing? Just dial it down after you get off the dyno? Any details or experience would be cool to learn about.
How do you tune if it keep changing? Just dial it down after you get off the dyno? Any details or experience would be cool to learn about.
09-09-2002, 07:40 PM
#2
Re: Turbo Tuning and Wastegate on a Dyno vs. Street? on a dynojet, dial you a/f in around 11.5 to 1 and you will be fine on the street/track. On a Mustang dyno (my favorite) dial it in to 12:1 and it will be 12:1 on the street/track. Best tuning is done on mustang dyno IMHO
09-09-2002, 09:34 PM
#3
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Re: Turbo Tuning and Wastegate on a Dyno vs. Street? Witya. But boost won't change as well? A turbo tuner said that boost on a dynojet runs lower but under load produces more boost on the street?
Does the 11.5:1 change to 12:1 on the street basically? Thx!
<small>[ September 10, 2002, 11:01 AM: Message edited by: MelloYellow ]</small>
Does the 11.5:1 change to 12:1 on the street basically? Thx!
<small>[ September 10, 2002, 11:01 AM: Message edited by: MelloYellow ]</small>
09-10-2002, 07:15 AM
#4
Re: Turbo Tuning and Wastegate on a Dyno vs. Street? hmmm runs lower? I'll have to think about that as the wastegate is gonna control that.....
yeah 11:5 on dynojet to get 12:1 on the street.
Get to a Mustang dyno if you can. They can do some nifty simulated loads where you can even work on part throttle tuning.
yeah 11:5 on dynojet to get 12:1 on the street.
Get to a Mustang dyno if you can. They can do some nifty simulated loads where you can even work on part throttle tuning.
09-10-2002, 08:21 AM
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Re: Turbo Tuning and Wastegate on a Dyno vs. Street? Boost is only lower on a dyno if your using a boost controller (manual or electronic) that is adjusting boost by creating a leak. If you just have a wastegate it should not matter.
Gary
Gary
09-10-2002, 10:21 AM
#6
Re: Turbo Tuning and Wastegate on a Dyno vs. Street? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by red ws6 99:
<strong>If you just have a wastegate it should not matter.
</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Not really true
I've been on both and there is a difference. However, it seems to manifest itself more for manual trans setups.
The problem is engine load. Turbos rely on exhaust energy to spool, that's directly related to engine load.
With a manual trans, the only load applied to the engine is from the dyno itself. On a mustang dyno it's a real load, were a dynojet is solely the load from accelerating the roller itself.
I get constant boost on the mustang dyno i tune on, every time and the same on the street when i roll on/off.
I went to a corvetteforum dyno day last year, had been on the normal dyno 2 days before. 10 psi on the mustang and on the street.
No changes, i hit the dynojet. Boost came up to 10psi on the initial hit, then promptly droped to under 8 after the roller came up to speed. I turned it up on each run to get 10 psi at the end of the run. The last pull was a spike to over 12 on the initial hit as the roller accelerated then drop to 10psi.
I made no changes, rolled off the dynojet to the street and hit 15 psi as soon as i got into it.
There is a big difference.
The auto cars have the advantage of the converter to load the car. It keeps the engine loaded and the turbo spooled.
If you don't have the exhaust flow a wastegate can't do it's job.
<strong>If you just have a wastegate it should not matter.
</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Not really true
I've been on both and there is a difference. However, it seems to manifest itself more for manual trans setups.
The problem is engine load. Turbos rely on exhaust energy to spool, that's directly related to engine load.
With a manual trans, the only load applied to the engine is from the dyno itself. On a mustang dyno it's a real load, were a dynojet is solely the load from accelerating the roller itself.
I get constant boost on the mustang dyno i tune on, every time and the same on the street when i roll on/off.
I went to a corvetteforum dyno day last year, had been on the normal dyno 2 days before. 10 psi on the mustang and on the street.
No changes, i hit the dynojet. Boost came up to 10psi on the initial hit, then promptly droped to under 8 after the roller came up to speed. I turned it up on each run to get 10 psi at the end of the run. The last pull was a spike to over 12 on the initial hit as the roller accelerated then drop to 10psi.
I made no changes, rolled off the dynojet to the street and hit 15 psi as soon as i got into it.
There is a big difference.
The auto cars have the advantage of the converter to load the car. It keeps the engine loaded and the turbo spooled.
If you don't have the exhaust flow a wastegate can't do it's job.
09-11-2002, 08:52 AM
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Re: Turbo Tuning and Wastegate on a Dyno vs. Street? Do they correct for this boost difference on the dyno, because if you run about 10% less boost on the dyno then you give up some hp. Then you tune it rich so it won't blow up on the street and you lose more hp. So what's the correction formula?
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09-11-2002, 10:14 PM
#10
Re: Turbo Tuning and Wastegate on a Dyno vs. Street? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by MelloYellow:
<strong>Sounds like the Mustang Dyno is very important for a FI tune.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Just for the simple fact it can load the car any way you want.
When was the last time you could have a dynojet hold the car at 70 MPH to set boost? We did just that a day ago on the mustang dyno.
Actual load is VERY important on a turbo car when tuning.
<strong>Sounds like the Mustang Dyno is very important for a FI tune.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Just for the simple fact it can load the car any way you want.
When was the last time you could have a dynojet hold the car at 70 MPH to set boost? We did just that a day ago on the mustang dyno.
Actual load is VERY important on a turbo car when tuning.
09-11-2002, 11:16 PM
#11
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Re: Turbo Tuning and Wastegate on a Dyno vs. Street? Sounds very cool!
Any opinions of the MD-250 vs 750 vs 1000 vs 1750??
Originally I shied (sp?) away from the Mustang since a popular bolt-on (scary mech) shop down here carts around a transportable mustang dyno on a trailer to the shows that gives out notoriously whacked dyno results.
Sounds like a nice loaded fixed placement Mustang is the ticket! Crossing fingers they have a Wideband O2. Seems a hard combo to find down here.
<small>[ September 11, 2002, 11:24 PM: Message edited by: MelloYellow ]</small>
Any opinions of the MD-250 vs 750 vs 1000 vs 1750??
Originally I shied (sp?) away from the Mustang since a popular bolt-on (scary mech) shop down here carts around a transportable mustang dyno on a trailer to the shows that gives out notoriously whacked dyno results.
Sounds like a nice loaded fixed placement Mustang is the ticket! Crossing fingers they have a Wideband O2. Seems a hard combo to find down here.
<small>[ September 11, 2002, 11:24 PM: Message edited by: MelloYellow ]</small>
