Dynoing - 4th Gear Pull v. 3rd Gear Pull
07-28-2008, 06:09 PM
#26
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Re: (RedZone)
On this topic I have some questions for the tuners....
1. would you dyno in a higher gear 4th or 5th just to put the engine under a lot of load to test for detonation?
2. dyno the engine in a higher gear 4th or 5th to make sure the tune is on point because of sensor delay, specifically a/f ratio. (mentioned earlier)
1. would you dyno in a higher gear 4th or 5th just to put the engine under a lot of load to test for detonation?
2. dyno the engine in a higher gear 4th or 5th to make sure the tune is on point because of sensor delay, specifically a/f ratio. (mentioned earlier)
07-29-2008, 06:12 AM
#27
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Re: (Phil M)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Phil M »</TD></TR><TR><TD CLASS="quote">On this topic I have some questions for the tuners....
1. would you dyno in a higher gear 4th or 5th just to put the engine under a lot of load to test for detonation?
2. dyno the engine in a higher gear 4th or 5th to make sure the tune is on point because of sensor delay, specifically a/f ratio. (mentioned earlier)</TD></TR></TABLE>
1. no, if its going to detonate, its going to do so no matter the gear.
2. no, generally you shoot for a flat afr, so delay in sensor readings dosnt matter.....
and any dyno pull that takes longer than about 10 seconds is kinda scary
1. would you dyno in a higher gear 4th or 5th just to put the engine under a lot of load to test for detonation?
2. dyno the engine in a higher gear 4th or 5th to make sure the tune is on point because of sensor delay, specifically a/f ratio. (mentioned earlier)</TD></TR></TABLE>
1. no, if its going to detonate, its going to do so no matter the gear.
2. no, generally you shoot for a flat afr, so delay in sensor readings dosnt matter.....
and any dyno pull that takes longer than about 10 seconds is kinda scary
07-29-2008, 12:59 PM
#28
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Re: (JDogg)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDogg »</TD></TR><TR><TD CLASS="quote">
1. no, if its going to detonate, its going to do so no matter the gear.
2. no, generally you shoot for a flat afr, so delay in sensor readings dosnt matter.....
and any dyno pull that takes longer than about 10 seconds is kinda scary</TD></TR></TABLE>
I disagree with all 3 of those statments.
1. no, if its going to detonate, its going to do so no matter the gear.
2. no, generally you shoot for a flat afr, so delay in sensor readings dosnt matter.....
and any dyno pull that takes longer than about 10 seconds is kinda scary</TD></TR></TABLE>
I disagree with all 3 of those statments.
07-29-2008, 01:36 PM
#29
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Re: (DonF)
Agree.
You have to do long pulls in order for the cylinder to build heat. Only way to be sure there's no problems with detonation. A quick pull could hide those problems.
Also the long pull will give more precise sensor readings. And more accurate power measurement as well.
When I dyno I can usually get within 1hp consistently. I usually do the runs in 4th,but also in 5th at times.
You have to do long pulls in order for the cylinder to build heat. Only way to be sure there's no problems with detonation. A quick pull could hide those problems.
Also the long pull will give more precise sensor readings. And more accurate power measurement as well.
When I dyno I can usually get within 1hp consistently. I usually do the runs in 4th,but also in 5th at times.
07-29-2008, 02:11 PM
#30
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Re: (ce)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ce »</TD></TR><TR><TD CLASS="quote">Agree.
You have to do long pulls in order for the cylinder to build heat. Only way to be sure there's no problems with detonation. A quick pull could hide those problems.</TD></TR></TABLE>
i guess thats the reason why u would see an untuned car breaking up at a higher gear after punching it (even though your not suppose to be doing that on a car thats not tuned)
You have to do long pulls in order for the cylinder to build heat. Only way to be sure there's no problems with detonation. A quick pull could hide those problems.</TD></TR></TABLE>
i guess thats the reason why u would see an untuned car breaking up at a higher gear after punching it (even though your not suppose to be doing that on a car thats not tuned)
07-29-2008, 03:06 PM
#31
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Re: (DonF)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DonF »</TD></TR><TR><TD CLASS="quote">
I disagree with all 3 of those statments. </TD></TR></TABLE>
I'm glad I'm not the only one. That is why I had those questions.
I disagree with all 3 of those statments. </TD></TR></TABLE>
I'm glad I'm not the only one. That is why I had those questions.
07-29-2008, 04:28 PM
#32
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Re: (DonF)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DonF »</TD></TR><TR><TD CLASS="quote">
I disagree with all 3 of those statments. </TD></TR></TABLE>
ill have to agree with don on this one.....
anyone ever drag race on the dyno?
I disagree with all 3 of those statments. </TD></TR></TABLE>
ill have to agree with don on this one.....
anyone ever drag race on the dyno?
07-30-2008, 01:09 AM
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Re: (Aquafina)
well I have done 1st through 4th gear pulls, even 1st through 5th and it gives you a chance to see how the car reacts when shifting through the gears.
07-30-2008, 05:16 AM
#39
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Re: (junkyard racer)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ce »</TD></TR><TR><TD CLASS="quote">Agree.
You have to do long pulls in order for the cylinder to build heat. Only way to be sure there's no problems with detonation. A quick pull could hide those problems..</TD></TR></TABLE>
how about alot of quick pulls? you dont need one long pull to get everything hot.
most morons cant build motors that will last if you do a bunch of 20sec dyno pulls..
what about the transmissions? you're going to break 4th and 5th gear alot faster on the dyno loading them up like that.
and becides if we are talking about a typical honda (or most imports for that matter...), we've all tuned like 10000000000 of em so we know what works and there is no need to beat em up on the dyno.
You have to do long pulls in order for the cylinder to build heat. Only way to be sure there's no problems with detonation. A quick pull could hide those problems..</TD></TR></TABLE>
how about alot of quick pulls? you dont need one long pull to get everything hot.
most morons cant build motors that will last if you do a bunch of 20sec dyno pulls..
what about the transmissions? you're going to break 4th and 5th gear alot faster on the dyno loading them up like that.
and becides if we are talking about a typical honda (or most imports for that matter...), we've all tuned like 10000000000 of em so we know what works and there is no need to beat em up on the dyno.
07-30-2008, 06:48 PM
#41
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Re: (road.head)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by road.head »</TD></TR><TR><TD CLASS="quote">4th gear vs 3rd gear = more load for longer period of time = more heat = greater chance of detonation/misfires/damage = change in optimal ignition timing per gear
</TD></TR></TABLE>
like i said.. the gear per-say, doesn't matter.. its the time the pull takes, as long as you are fully loading the motor the gear is irrevelent
</TD></TR></TABLE>
like i said.. the gear per-say, doesn't matter.. its the time the pull takes, as long as you are fully loading the motor the gear is irrevelent
07-31-2008, 01:00 PM
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Re: (JDogg)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDogg »</TD></TR><TR><TD CLASS="quote">
like i said.. the gear per-say, doesn't matter.. its the time the pull takes, as long as you are fully loading the motor the gear is irrevelent</TD></TR></TABLE>
Doesn't it matter depending on the dyno and its capabilitys? such as a dyno pack verses a dynojet without the eddy current load
option.
like i said.. the gear per-say, doesn't matter.. its the time the pull takes, as long as you are fully loading the motor the gear is irrevelent</TD></TR></TABLE>
Doesn't it matter depending on the dyno and its capabilitys? such as a dyno pack verses a dynojet without the eddy current load
option.
07-31-2008, 02:43 PM
#43
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Re: (RedZone)
do you use 4th on a 200hp car? whats the point? it takes 10 sec on my 224x to do that pull, it takes about the same ammount of time do a pull on a 400hp car in 4th.
when i used the dynapac i normally used a ~8 sec ramp sometimes a little longer but around 8 just depended on how it felt.
when i used the dynapac i normally used a ~8 sec ramp sometimes a little longer but around 8 just depended on how it felt.
07-31-2008, 05:01 PM
#44
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Re: (JDogg)
This stuff is way to hard to explain to an expert. Ask Brad about real dyno testing for Daytona, Atlanta, and Richmond. Drag racing has absolutly NOTHING to do with a street car. Real drag racers ( top fuel, funny cars) have no plugs left after the 1/8, they run on detonation. That is tough to do just going to Wal-Mart. 90% of the problems on this forum are detonation related, but who knew.
07-31-2008, 06:34 PM
#45
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Re: (DonF)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DonF »</TD></TR><TR><TD CLASS="quote">This stuff is way to hard to explain to an expert. Ask Brad about real dyno testing for Daytona, Atlanta, and Richmond. Drag racing has absolutly NOTHING to do with a street car. Real drag racers ( top fuel, funny cars) have no plugs left after the 1/8, they run on detonation. That is tough to do just going to Wal-Mart. 90% of the problems on this forum are detonation related, but who knew. </TD></TR></TABLE>
thats some interesting information i never knew before
thats some interesting information i never knew before
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