well i finally got to run my 1991 firebird 5.0 on the dyno today so i thought i would post a comparison to my 1992 Camaro 3.1

1992 Camaro RS 3.1V6(dyno jet)
~133hp
~178Tq

1991 Firebird 5.0V8(mustang Dyno)
~134hp
~216Tq

i also did some other tests which i will edit this when i get home....so check back later on. i have to say im a bit dissapointed with that 5.0, and its in damn good shape. i know there are a few diffrences in the dynos but i still expected more outtve the V8. anyways ill post more details in awhile

Horrible thank *** my 305 will be gone this summer for a 350 or an 383

You need to run both cars on the same dyno to draw similarities between the two. Your nukmbers for the 305 would have been much higher had you used the dyno jet. In the same mannor the V6 numbers would have been much less on the stang dyno. The difference is most likely larger than it appears. Do you have the graphs to show where the power was made? I bet the power curve for the 305 was much flatter.

i have a book on camaros and firbirds and my 84 lg4 makes 240tq and 175hp if i rember right....

yeah i would run the 3.1 on the mustang dyno but its all taken apart now for the engine swap(3.4),there really wasnt much of a diffrnece in graphs ill have to get my v6 one out again.

it was 134hp at 4000 and 216tq at 2500

150hp/240tq...

I saw a dyno of an L98 today at school, 230rwhp and 285rwtq... i dunno what they did to it, but those are some sweet numbers if its close to stock

The difference between the numbers on a Mustang Dyno and a Dyno Jet is quite large. Like Shifty said, you can't really compare the numbers without putting them on the same dyno. The only numbers that really matter are your E/T and MPH though!

im gunna see if my school will let me put my car on the dynojet... i wanna helmet so i can go DRAG and get those two number tony

That is what people say... but I have dyno'ed the same car on each, less than a week apart, and there was less than a 5hp diffrence.

Really? I'll try and get some hard numbers out of people, but I've heard of people down here in the valley getting way different numbers, until then, nevermind

I'm not saying its not the case, I have heard the same thing from many people, including the dyno operators.

I understand the diffrence between the way the two work, and there is a diffrence there.

But my experiance showed both of them to be close, on the same car, with no changes. We (car owner and I) were expecting the dynojet to give higher numbers than the mustang.

Is there a differance bewteen a "Mustang Dyno" and a DynoJet?

yup

my theory is, Mustangdyno used bigger and stronger horses,
to determine how much work a horse can do.

of course,you with think that this kind of thing would
be standadized, I guess not.

if you want a more powerful car --> Dynojet

if you want a faster 1/4 mile time --> 660 ft track

They should be a standard.... What about the new car market, what do they advertise with? i would guess dynojet for the bigger numbers... bigger sales.. but i am sure that japan and america might use different standards also... WEiRd

Or am i not understanding.lol.

What Contact said. My limited experience with the 2 different kind of dynos indicates that Mustang dynos have spit out considerably lower numbers than what I usually expect. How about a ~420HP engine that laid only 250 to the rear wheels on a Dynojet but ran almost 111 MPH through the traps in a full-weight 3rd gen? You tell me the part that doesn't fit.

However, I can almost perfectly predict what my cars will lay to the rollers on a DynoJet just by driving them around for a few days. I predicted the blown 383 in my Malibu was making about 450HP at the crank. On a DynoJet it laid 390 to the rear wheels- almost exactly where I thought it would be. And I trap only a couple of MPH higher than the other car in the above paragraph.

i seen a thing on Discovery channel and they tested a morticyclce and it sayed how many times it could spin a 80 lb wheel or it might have been a 800 lbs wheel to test horse power and tq. that was on a dynoJet.

The diffrence has to do with the way the load is generated on the drum, and also the way the torque/hp is calculated.

Doesn't suprise me, the LO3 is only rated at 170HP, minus 20% for the P.L. - you get 136, or about what I would expect, since I doubt the LO3 was an "Under rated" engine.... ever. Yet I have seen a couple 2.8's, and 3.1's suprise me, not to say this one would, but it's also not extremely adnormal as the peak torque probably occured higher in the operating range of the motor.

Does anyone really feel that threatened that they need to argue about which dyno shows what? Okay, a little V6 had almost the same HP, but NOWHERE near the same amount of torque... so what?

so what? You want to compare apples to apples, and that comparison isn't exactly the same kind of fruit necessarily.

Like I said earlier...

apples to apples comparison

355 ProTop heads, Lunati Solid cam, HSR, TH350. No changes to car, dyno runs made less than a week apart

Mustang:
310rwhp and 314rwtq
Dyno Jet:
306rwhp and 306rwtq

Maybe I should have said, do some LO3 guys feel that threatened by a MPFI v6? Sorry that you feel threatened, and that's not coming from a v6 owner.

That 5.0 was with the stock air cleaner..... correct?


That POS can't even get enough air for a little 4-cyl Corsica.

I don't think anyone is feeling threatened. I think its a natural response from people that have heard about differences between the two dyno types to ask for a comparison on the same dyno. I think it's more of a curiousity of how close the two engines really are. Everyone here that owns the 170hp V8 knows its sad how much power these engines make, not much threatens my confidence (or lack thereof) in this motor.

Edited

It's apparent that there will be two seperate groups of people in this thread....

One group that says "Hey, look, that 3.1 put out almost the same amount of HP as the 5.0. That's interesting...." Having nothing to prove and move on.

Then there's the group that will point the finger at any excuse they can get to defend their cars. The "Falibility" between the two dyno's is not that great - 5% or less -

Can't anything jsut ever be interesting to see anymore?

Read my post over and try to comprehend it this time. Nobody in here is trying to defend anything. Why are you thinking that? It's not a surprise that that 3.1 put down close HP numbers, I was simply saying that people always say the two dynos give different numbers. It's a natural response for someone to want the same dyno to be used for comparative results, be it a 3.1, a 305, a 350, a 454 doesn't matter. Some people obsess over completely, and unquestionably accurate numbers for things. I just don't see where anyone tried to defend an LO3 becuase everyone knows they have close HP numbers to a 3.1, and you contribute zero to this thread by turning it into this.

The L03 has its power alot farther down in the RPM band than a 3.1 does. The 3.1 really has to spin to make that power. My jimmy had one from an isuzu rodeo. Terrible combination compared to my stock 305 G20. The 3.1 doesn't have any low speed torque at all. If the two were to line up side by side with good drivers the 305 would jump off the line far enough ahead that the 3.1 would never catch up. The factory 170 HP LE9 305 in my G20 ran much better than the 150 HP 3.1 in my Jimmy from the isuzu. 2 lane country roads in the Jimmy stunk. You could not pass unless you had lots of room, the G20 had no problems passing.

i dunno if i mentioned this or not but my 3.1 isnt stock and the 305 was just so ya know, so a stock 3.1 isnt even gonna come close.

also random comment but i raced a freidns 305 camaro 5 speed one night and the take off is damn near the same if not identical, most of which was due to tire spin and do to the fact i have posi so i get really good jumps off the line

i wish i could get my 3.1 in on the dyno before i tear it apart so you could have a bit better comparison but its sitting on jackstands waiting for the 3.4 im building. i will more than likely dyno the 3.4 on the same dyno as the 5.0 so expect a comparison of those two engines at some point

third gear seems to be where the two engines differ greatly, the third gear in the 5.0 pulls way harder than the third gear behind the 3.1...if i get a good enough jump off the line i can maintain an even run with a 5.0 but if my jump sucks third gear is where i get passed

That'd be cool to see, what are you doing with the 3.4?

search my name and find my thread on 3.1 to 3.4 swap....basically im building it up with every possible improvment to see what i can get outtve it NA...then im gonnna add a power adder, NA im looking for at least 200 hp and 250 tq

yeah i could build a v8 for cheaper with more power but i want something diffrent...eventually ill swap out that 5.0 for something with a little more kick

I hear ya, already got a V8 in one car why not keep the 6 in the other and see what you can do. Sounds like a cool build, good luck with it.

Im not at all surprised that the 3.1 could catch up to the stock 305, powerwise. The L03 package as a whole is really lame. The heads, cam exhaust, airleaner, etc. all have to go to make reasonable power.

With a 4.10 gearset in the rear (if you havnt done so yet) the V6 could be a really fun car.

wow thanks, not often i hear someone say that about my v6 project, whould be interesting to see what i can get outtve it

for now its got the stock 3:42 gears in it....if i do upgrade itll only be to 3:73s so i can still take it outtve town if i want