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28RS Dyno(s)

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#21 ·
Re: 28RS Dyno(s) (silvercar)

Quote, originally posted by silvercar »

prolly about 140... no joke..
I have seen with my own eyes a stock AWP with only a KN drop in produce 171 to the tire... the operators answer: "factory freak" LMAO not in this life time...
then youve got jokers out there with stock cars sporting only a chip--- claiming in the 210 range... there is no possible way
why not just dyno pulling a trailer?

I dyno without the seats to make put down more power..
Image
Image

Seriously though, SOME dynojets are optimistic...some aren't. I guess it's there calibration or something. I've seen people go from one dynojet to the other and gain 10whp just like that.
Image
 
#23 ·
Re: 28RS Dyno(s) (27psiBoom)

Quote, originally posted by 27psiBoom »
so F dynos http://****************.com/smile/emthdown.gif

We can't, they may not work to compare different cars on different dynos BUT they do work for trying to get the best power out of YOUR car. http://****************.com/smile/emthup.gif
 
#24 ·
Re: 28RS Dyno(s) (GT-ER)

Quote, originally posted by GT-ER »

I dyno without the seats to make put down more power..
Image
Image

Seriously though, SOME dynojets are optimistic...some aren't. I guess it's there calibration or something. I've seen people go from one dynojet to the other and gain 10whp just like that.
Image


No.. theyre off because of the method they use to calculate power. The entire concept is flawed. Did you know that Dynojets werent even originally intended to calculate power? they were designed and built by some motorcycle racer out in the midwest ( i think) to perform endurance tests.
it simply plugs the rate your car accelerates a known mass (the roller) to some speed into an equation...and says ok.. 250 hp LMAO.. dyno jets apply 2400 pounds of static load to the rollers
Image
Image

wheras, a load bearing dyno applys the load to the wheel rollers. Unlike inertia dynos which use the weight of heavy rollers as a load against vehicle traction, a LB dyno uses electronically variable eddy current loads, allowing constant speed and even selectable negative ramp rates.
summary:
inertia= http://****************.com/smile/emthdown.gif
load bearing= http://****************.com/smile/emthup.gif
 
#25 ·
Re: 28RS Dyno(s) (silvercar)

Quote, originally posted by silvercar »
No.. theyre off because of the method they use to calculate power. The entire concept is flawed. Did you know that Dynojets werent even originally intended to calculate power? they were designed and built by some motorcycle racer out in the midwest ( i think) to perform endurance tests.
it simply plugs the rate your car accelerates a known mass (the roller) to some speed into an equation...and says ok.. 250 hp LMAO.. dyno jets apply 2400 pounds of static load to the rollers
Image
Image

wheras, a load bearing dyno applys the load to the wheel rollers. Unlike inertia dynos which use the weight of heavy rollers as a load against vehicle traction, a LB dyno uses electronically variable eddy current loads, allowing constant speed and even selectable negative ramp rates.
summary:
inertia= http://****************.com/smile/emthdown.gif
load bearing= http://****************.com/smile/emthup.gif

I understand that....what I meant was you can go to one dynojet and put 280whp 5 times straight.... then go to another dynojet and put 265whp 5 times straight and conditions can be nearly identical. I don't know why though cause as long as you stick with one dynojet in particular your gains/losses will be consistent even though it may not be TRUE torque/horsepower.
Another....why are dynojets so popular?
 
#26 ·
Re: 28RS Dyno(s) (silvercar)

Quote, originally posted by silvercar »

No.. theyre off because of the method they use to calculate power. The entire concept is flawed. Did you know that Dynojets werent even originally intended to calculate power? they were designed and built by some motorcycle racer out in the midwest ( i think) to perform endurance tests.
it simply plugs the rate your car accelerates a known mass (the roller) to some speed into an equation...and says ok.. 250 hp LMAO.. dyno jets apply 2400 pounds of static load to the rollers
Image
Image

wheras, a load bearing dyno applys the load to the wheel rollers. Unlike inertia dynos which use the weight of heavy rollers as a load against vehicle traction, a LB dyno uses electronically variable eddy current loads, allowing constant speed and even selectable negative ramp rates.
summary:
inertia= http://****************.com/smile/emthdown.gif
load bearing= http://****************.com/smile/emthup.gif

Agreed 200%
Clayton Dyno: 2000 LB 48" roller with eddy current load cell......Tells no lies!
Image
 
#27 ·
Re: 28RS Dyno(s) (GT-ER)

Quote, originally posted by GT-ER »

I understand that....what I meant was you can go to one dynojet and put 280whp 5 times straight.... then go to another dynojet and put 265whp 5 times straight and conditions can be nearly identical. I don't know why though cause as long as you stick with one dynojet in particular your gains/losses will be consistent even though it may not be TRUE torque/horsepower.
Another....why are dynojets so popular?

But how on earth could they be used to tune properly?
A dyno is more than just something to go to for bragging rights.. in the hands of a skilled operator/tuner they are very good tools
dynojets are popular because they are cheap... any hack can have one of those in thier shop...
dynojet=10-15k
dynodynamics or other comparable= >100k
 
#28 ·
Re: 28RS Dyno(s) (silvercar)

Quote, originally posted by silvercar »
But how on earth could they be used to tune properly?
A dyno is more than just something to go to for bragging rights.. in the hands of a skilled operator/tuner they are very good tools
dynojets are popular because they are cheap... any hack can have one of those in thier shop...
dynojet=10-15k
dynodynamics or other comparable= >100k

Why not? I do something...the power goes up so I'm going good....if it goes down I'm doing bad. It may not give proper hp but it is consistent ( at least with me it has been ) and that's what matters when tunning. It's bad for comparing with other cars though.
CRAP I didn't know the other ones could be so expensive.
Image
 
#29 ·
Re: 28RS Dyno(s) (GT-ER)

If your "tuning" a car doing fuel and timing maps yourself on a grid, you really need a load bearing dyno. It's so nice to hold an RPM and just roll throught the map a column at a time. Takes forever on the inertia crap, might as well be road tuning.
 
#30 ·
Re: 28RS Dyno(s) (enginerd)

Quote, originally posted by enginerd »
If your "tuning" a car doing fuel and timing maps yourself on a grid, you really need a load bearing dyno. It's so nice to hold an RPM and just roll throught the map a column at a time. Takes forever on the inertia crap, might as well be road tuning.

True but I mean if what your doing is actually making or taking away power. I WISH I had access to one of these cool dynos you guys are talking about but I don't have one here in PR ( that I know of ) and plus my dyno operator lets me run my car on his dyno for CHEAP.
Image
 
#33 ·
Re: 28RS Dyno(s) (GT-ER)

Quote, originally posted by GT-ER »

Why not? I do something...the power goes up so I'm going good....if it goes down I'm doing bad. It may not give proper hp but it is consistent ( at least with me it has been ) and that's what matters when tunning. It's bad for comparing with other cars though.
CRAP I didn't know the other ones could be so expensive.
Image

Okay...
go roll up on a dynojet and map .9 bar at 3000 rpms and get back to me lol
edit:
if you map a car on an inertia dyno and then get it on the street or a LB dyno its going to be in totally different load sites most likely... subjecting your motor to poor a/fs, high EGTs, shty timing, etc..
i would tune on the street and run logs before i would consider a dynojet lol at least its in the right load there


Modified by silvercar at 4:24 PM 1-6-2006
 
#34 ·
Re: 28RS Dyno(s) (silvercar)

Quote, originally posted by silvercar »
Okay...
go roll up on a dynojet and map .9 bar at 3000 rpms and get back to me lol
edit:
if you map a car on an inertia dyno and then get it on the street or a LB dyno its going to be in totally different load sites most likely... subjecting your motor to poor a/fs, high EGTs, shty timing, etc..
i would tune on the street and run logs before i would consider a dynojet lol at least its in the right load there

Modified by silvercar at 4:24 PM 1-6-2006

Well, either way...I have no choice.
Image
 
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