I think that the Mustang is the most accurate and reads about 20-22% lower than the crank #'s. Most Dynojets are about close to crank Hp. These are good things to know when you get that printout at the shop of your choice. Im in CT and all the surrounding shops near me use the Dynojet and all were overinflated by the shop or tuner.

 

I think that the Et has the most variables not the MPH. Have you ever bogged off the line and then still run your highest MPH? I have.

 

when i ran my 119, i didnt launch.... i rolled off the line and gave her the business.

the 116 was with a launch and a terrible 1.7 60

 

I'll add to this.

Mustang Dyno........HP in sig.

The highest trap so far w/o "no-lift shifting" is 131mph.

Haven't had 1 clean pass while being able to stay in boost between shifts to see what it can really trap........i'm still learning how my car likes to be shifted

 

If you have a person that can't drive very well the ET and MPH are not going to match the dyno numbers either. So you have to take that into consideration too.

 

i thought dyno's were used more as a tuning tool

 

You see that is what I am saying, horsepower calculators are cool, but most do not take into account other factors such as gearing, areodynamics, or even track conditions.

I am not saying all dyno jets read accurately, I am just saying that in my opinion most are pretty accurate in determining horsepower. I mean there are so many EVOs out there that are modded that it is fairly simple to determine where you stand or should stand. If some one takes there EVO to one Dyno Jet and puts down 415whp and with the same mods and relatively same condions take his or her car to another Dyno Jet and puts down say 485whp then in my opinion common sense should play a role in this. If there are plenty of EVOs out there with somewhat similiar mods putting down 410-420whp then it should be assumed that the 485whp number is way high. What if you have factory freak? Ok, then take your car to strip, and if it is truly making 485whp then it should trap around 125-127mph. If your car only traps 120mph, then it is again easy to assume that the 485whp is way high. Like I said, there are so many EVOs out there running 1/4 miles and putting down numbers on the dyno that is easy to assume where your car stands.


As far as dyno jets go, this is where most EVOs fall in line with-

EVO 300-320whp (360-384hp) - 109-113mph

EVO 320-350whp (384-420hp)- 112-116mph
Comparable to a C5 Corvette Z06

EVO 350-370whp (420-444hp)- 115-117mph
Comparable to 997 911 GT3
Comparable to C6 Corvette

EVO 370-400whp (444-480hp)- 116-120mph
Comparable to Ferrari 430

EVO 400-420whp (480-504hp)- 119-122mph
Comparable to 996 911 GT2

EVO 420-450whp (504-540hp)- 121-124mph
Comparable to 997 911 GT2
Comparable to C6 Corvette Z06

EVO 450-500whp (540-600hp)- 123-127mph
Comparable to Ford GT
Comparable to Dodge Viper SRT-10 (600hp)

EVO 500-550whp (600-660hp)- 126-129mph

EVO 550-600whp (660-720hp)- 129-132mph
Comparable to Ferrari Enzo

As you can see the numbers do most of the time match up. Let us say a EVO put down 565whp and trapped 130.8mph, how does that compare to an Enzo.

GT35R Turbo EVO
565whp (678hp)
3200Lbs
1/4 Mile Trap Speed- 130.8mph

vs,

Ferrari Enzo
660HP
3000Lbs
1/4 Mile Trap Speed- 134.6mph

18hp advantage to EVO, but Enzo weighs 200Lbs less and is a top end monster, so it pulls a lot harder than most EVOs at speeds in the tripple digits.

As far as what reads the most accurate, well you shouldn't compare numbers from a DJ to a Mustang or a true reading DD dyno. The best way to compare, is to compare numbers from the same type of dyno.

It is hard to explain, but if you have a EVO IX (3300Lbs)- stock turbo, many bolt ons and cams and put down 362whp on a Dyno Jet then that is about 434hp. You should do around 115-116mph in the 1/4 mile. A new BMW M3 weighs in about 3700-3800Lbs and is rated at about 420hp and it traps about 111-112mph. So I would say the 362whp is fairly accurate.

 

I saw consistent 131 traps from 475 on a Mustang Dyno (DTM Dyno), lifting to shift, 1.7's and 1.8's all day (not me)

 

they are but some people live and die by them. it's used to show the powerband and before/after, also gives a pretty accurate baseline reading.

 

This is a great post. I agree.

 

peak #'s do not = an accurate way to guess trap speeds.

 

I disagree with this statement, your saying that flywheel rated 405hp 3200Lbs cars trap 119-120mph. Find me one? The closest to that is a 2007 911 GT3 and it is rated at 415hp, weighs less, and pulls harder than a EVO at top end speeds and the quickest I've ever seen from one of those is 117mph traps. Honestly it doesn't really matter because a dyno is a tuning tool. But if you want to convert numbers to hp ratings like a car manufactuer the most accurate is a Dyno Jet.

 

Exactly that is why I have ranges. I am just saying that if your car is in the neighboor hood, you should be around a certain range. I am not saying that one car that does 480whp would automatically trap faster than another car that does 460whp. There are SO many factors that come into account. But what I thought was the point of this thread was to determine which Dyno is the most accurate in determining similiar numbers to what Manufactuers rate horsepower, and I believe a Dyno Jet is the most accurate. Maybe that isn't what the OP is wanting?

 

I agree that wasn't a response to your post just an overall statement in general

 

If the OP is wanting to know what the most accurate dyno is in determing horsepower, then I have to say in comparison to what???? Honestly like so many have said, a dyno is just a tuning tool. All of them read differently, you have Mustangs and DDs that read like DJs, you have DJs that read very low.