Preparing for dyno runs.
Thread Starter
Le Mans Master
Joined: Aug 2002
Posts: 6,080
Likes: 3
From: Clearwater FL
St. Jude Donor '06
Preparing for dyno runs.
Title says it. I'm putting the car on the rollers this Sat. 3 pulls with A/F. What should I do to prepare, and what sholud I try to change between runs. I pulled 2 spark plugs to check them and they looked fine (both had the pucks on them). Any ideas???
Le Mans Master
Joined: Oct 1999
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From: Sachse Texas
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Cruise-In II Veteran
Re: Preparing for dyno runs. (C4DC)
Just make sure it has fresh oil and check all the fluid levels.
If you have an Adjustable Fuel Pressure Regulator, you may want to adjust it a little between runs depending on your A/F ratio.
I fyou wanted to get some really good numbers, you could ice the intake between runs ;). I have personally never bothered to do that, but I have heard it can give you another 10-15 horse power. It just is not true on the road horsepower.
If you have an Adjustable Fuel Pressure Regulator, you may want to adjust it a little between runs depending on your A/F ratio.
I fyou wanted to get some really good numbers, you could ice the intake between runs ;). I have personally never bothered to do that, but I have heard it can give you another 10-15 horse power. It just is not true on the road horsepower.
Le Mans Master
Joined: Aug 2000
Posts: 6,227
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From: Corona CA
Re: Preparing for dyno runs. (C4DC)
Here's something I wanted to try.
The LT4 has a high compression ration of 10.8:1. It was designed in 95 to run on 94 octane gas. Out here in CA we can only get 91 octane. I would like to see if mixing in some 100 octane might make a difference.
You can buy the 100 octane in 5 gal container. Go with less than a 1/2 tank of gas. After the first run add the 5 gal of 100 to see if there is any change.
The LT4 has a high compression ration of 10.8:1. It was designed in 95 to run on 94 octane gas. Out here in CA we can only get 91 octane. I would like to see if mixing in some 100 octane might make a difference.
You can buy the 100 octane in 5 gal container. Go with less than a 1/2 tank of gas. After the first run add the 5 gal of 100 to see if there is any change.
Race Director
Joined: May 2001
Posts: 14,165
Likes: 9
Re: Preparing for dyno runs. (Vette92)
I have personally never bothered to do that, but I have heard it can give you another 10-15 horse power. It just is not true on the road horsepower.
Here's another day on the dyno, notice just as much variation in the numbers and all of the runs were within 3 minutes of each other. I honestly believe that the ice is a waste of time on an LT1 because the intake just doesn't get all that hot without coolant running through it. Maybe if I didn't already have a throttle body coolant bypass it could have made a difference. It's fun to experiment with but in my case you'll never see me at the drag strip with a bag of ice. :cheers:
[Modified by Nathan Plemons, 3:56 PM 3/18/2003]
Pro
Joined: Apr 1999
Posts: 533
Likes: 6
From: Poinciana Florida
Re: Preparing for dyno runs. (C4DC)
When the Vette is up in the air make sure the garage doors are wide open. That way when the straps break, the car won't damage the doors as it flys through the air!~!~!~!~!!!
All kidding aside, with your 96, if the tech utilizes LT1 edit you'll be ahead of the game.
All kidding aside, with your 96, if the tech utilizes LT1 edit you'll be ahead of the game.
Drifting
Joined: Jun 2001
Posts: 1,997
Likes: 1
From: Lake Ozark MO
Re: Preparing for dyno runs. (C4DC)
I'll be hitting the dyno for the first time in my life on April 12th. Fortunately, I'll be attending with at least 2 other CF members (96GS#007 and STL94LT1) and possibly a couple more.
We've got 4 hours of dyno time reserved between the 3 of us definitely attending.
For those that have dyno experience... Will they just strap one car on for an hour and have you make all your runs within that time? Or would a person be able to make a few pulls (with possible minor adjustments inbetween) and then let the next fellow take a turn.
I'm asking because LT1 Edit changes/uploads take a bit and I'd like to be able to drive around some so any changes can be computed properly by the PCM while not wasting precious dyno time. Time wasted strapped down while doing things like swapping throttle bodies (I'd like to do a 48 vs 52 and foil/no foil runs) seems rather unproductive as well.
But perhaps an hour strapped down gives plenty of time for changes. I don't know how long the actual setup and pulls take.
Anybody with some real dyno experience want to make some suggestions or describe the details involved with a dyno run? I'd just like to make effective use of my time.
We've got 4 hours of dyno time reserved between the 3 of us definitely attending.
For those that have dyno experience... Will they just strap one car on for an hour and have you make all your runs within that time? Or would a person be able to make a few pulls (with possible minor adjustments inbetween) and then let the next fellow take a turn.
I'm asking because LT1 Edit changes/uploads take a bit and I'd like to be able to drive around some so any changes can be computed properly by the PCM while not wasting precious dyno time. Time wasted strapped down while doing things like swapping throttle bodies (I'd like to do a 48 vs 52 and foil/no foil runs) seems rather unproductive as well.
But perhaps an hour strapped down gives plenty of time for changes. I don't know how long the actual setup and pulls take.
Anybody with some real dyno experience want to make some suggestions or describe the details involved with a dyno run? I'd just like to make effective use of my time.
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Race Director
Joined: May 2001
Posts: 14,165
Likes: 9
Re: Preparing for dyno runs. (Dan Parker '96)
It really depends on how the dyno shop operates. In the past our car club has rented the dyno and it's always been part of the deal that we had to help strap / unstrap the cars. Believe me you can get a LOT of cars on and off in 4 hours. If they don't mind strapping and unstrapping the same car many times you can do your thing while somebody else does their runs.
You'll notice that on one of my graphs above all three runs were made within 3 minutes of each other. That was on a day when the car club had rented the dyno and we were getting people on and off as quickly as possible. Nobody really had anything to change before runs, it was more or less just to see what they would.
You'll notice that on one of my graphs above all three runs were made within 3 minutes of each other. That was on a day when the car club had rented the dyno and we were getting people on and off as quickly as possible. Nobody really had anything to change before runs, it was more or less just to see what they would.
Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
Re: Preparing for dyno runs. (rcolling)
Here's something I wanted to try.
The LT4 has a high compression ration of 10.8:1. It was designed in 95 to run on 94 octane gas. Out here in CA we can only get 91 octane. I would like to see if mixing in some 100 octane might make a difference.
You can buy the 100 octane in 5 gal container. Go with less than a 1/2 tank of gas. After the first run add the 5 gal of 100 to see if there is any change.
The LT4 has a high compression ration of 10.8:1. It was designed in 95 to run on 94 octane gas. Out here in CA we can only get 91 octane. I would like to see if mixing in some 100 octane might make a difference.
You can buy the 100 octane in 5 gal container. Go with less than a 1/2 tank of gas. After the first run add the 5 gal of 100 to see if there is any change.
As an aside, adding high octane racing fuel can cause the car to lose power. Why? Because the PCM "tests" the knock sensors by advancing the timing and inducing knock. If it can't force the engine to knock, the PCM will fail the test, set a DTC and go into limp home mode.
Thread Starter
Le Mans Master
Joined: Aug 2002
Posts: 6,080
Likes: 3
From: Clearwater FL
St. Jude Donor '06
Re: Preparing for dyno runs. (rcolling)
Here's something I wanted to try.
The LT4 has a high compression ration of 10.8:1. It was designed in 95 to run on 94 octane gas. Out here in CA we can only get 91 octane. I would like to see if mixing in some 100 octane might make a difference.
You can buy the 100 octane in 5 gal container. Go with less than a 1/2 tank of gas. After the first run add the 5 gal of 100 to see if there is any change.
The LT4 has a high compression ration of 10.8:1. It was designed in 95 to run on 94 octane gas. Out here in CA we can only get 91 octane. I would like to see if mixing in some 100 octane might make a difference.
You can buy the 100 octane in 5 gal container. Go with less than a 1/2 tank of gas. After the first run add the 5 gal of 100 to see if there is any change.
