Spyder_Venom

In the latest thread asking how much HP your car has, I got thinking. With the exception of 2-3 people, almost everyone is posting the "rated" hp or what they think thier car will make... So who here has actually dynoed thier car?

Any tuners in the TFP?

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telekinetic

I've dyno'd my MR2 NA 9 or 10 times...I'm keeping charts for the gains from each mod, and I was the dyno tester for a prototype intake. I'd increased the old motor from the stock 104.9 rwhp to 119.7 rwhp. Who knows how that will translate to the new motor (stupid catastrophic rod bearing failure, grumble grumble)

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EVIDENT

I'm dynoed at 148 rwhp... and 253 ft/lbs

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clonmult

Many years back, a friend worked at a car tuners.

They regularly dealt with the popular Sierra Cossies, Escorts, Celica GT-4s, etc. etc. They even modded the bosses brothers Bentley.

Friend put his car on it - 82/83 model Ford Sierra 2.0 Ghia Auto. We had always thought it felt chronically underpowered. Rated out of the box at 100brake.

Actual power? Just under 50. It ran like a total dog.

qtpye4u84

MIne is 172, I took it into my auto tech school, So me and a few friends were checking out my car.

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merkerguitars

I will do a rear wheel dyno once I get my car assembled. I would like to do an engine dyno but it's really not worth pulling the engine out after break in.

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Scorps

I would love to go to a dyno, but I don't think there is one in town here!

silent_jay

280HP 1996 2.5RS

PT no use dynoying the Daytona, just joking man

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Scorps

LOL I'm just curious to see what it will have after I rebuild the engine and slap a new turbo with a blow-off valve on

440sixpack

I took my Ram a few weeks after I bought it. Got 247 rwhp, 299 rwtq, but there's issues with the run that make those numbers suspect (too low).

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My Toys:
1970 Dodge Challenger R/T 440SIXPACK
2003 Dodge Ram 1500 SLT QuadCab 4x4 5.7L Hemi Magnum

Kurant

Actully, if it's a Hemi, those are pretty close to what others have Dyno'd also. Look around online.

bad30th

Kurant, you beat me to it

Your "hemi" is in a front engine, rear wheel drive truck, therefore your powertrain and drivetrain loss will be greater than that of say a front engine front wheel drive honda.

And no offense, but the amazing "Hemi" is a helluva lot of hype. Just another engine..... but I wont even get into that.

silent_jay

My thoughts exactly

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bad30th

Holy shit, we agree on something silent_jay !!!

CheeseButtons

I've dynoed alot of times. 267whp was my best.

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irseg

Yep. It was a unique engine when it came out in the 1950s, but now it's just a marketing gimmick.

Pretty much all 4-valve engines have hemispherical heads, as do many others. My mom's Kia is a "Hemi". Doesn't mean it can get out of its own way!

telekinetic

LOL that's awesome. Dodge sure is milking it in their latest commercial campaign, aren't they?

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telekinetic

Do an engine dyno? What is that? I haven't heard of an engine dyno that you can do. You should do both, and calculate your drivetrain loss!

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Kurant

And actully, there is a shop up here called Hales Tech that dyno'd a Hemi witht he 20" wheels on it, it was 228rwhp. Can't remember the rwtq number but I remember the HP number, the dyno sheet was posted online, I'll see if I can track it down.

Spyder_Venom

Just remeber those bling bling wheels KILL RWHP and TQ. Unsprung weight is a bitch

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merkerguitars

My same thoughts exactly....now if they would of reissued the original hemi and parts where interchangable and it was the same cubic inches...then I would really be excited. But it's only 350 cubic inches compared to 426 cubic inches

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MSD

There's no way I'm going to deal with the embarassment of driving in to dyno a stock Buick Century. Maybe if I do something to the engine.

irseg

I know someone who ran his 3.8 V6 T-Bird on a dyno for the hell of it. It's rated 145hp at the flywheel. He wouldn't even tell me what it dynoed at.

440sixpack

Oh I know, we went over this on DTO back when the hemis came out. The torque is about right, but the issue is with the hp number - with the 105 mph speed limiter active, you peak out at 1000 RPM under the claimed hp peak of 5400 RPM (and if you disable the limiter as I did, the computer gets confused about what's going on and the graph gets all spikey and weird, we think the timing is being bounced around). I had it up to 147 mph on the dyno, but I wouldn't advise doing that again with the stock tires, they damn near blew off the wheels.

__________________
Be a victor, or be a victim - David Vincent

My Toys:
1970 Dodge Challenger R/T 440SIXPACK
2003 Dodge Ram 1500 SLT QuadCab 4x4 5.7L Hemi Magnum

MSD

Dodge Ram Hemi Sport: $32,625
Two dyno runs: $50
The sudden realization that you're going 147mph on S-rated tires: Priceless

silent_jay

Is this the first thing we agreed on, I can't rememeber.

I laughed my ass off at that.
I had a Century before I got my Subie, a 92 with like 330,000KM's on it, jesus that car was everywhere, from Ontario to through Michigan, Ohio, Kentucky, on to Nashville, and back, Michigan and back again when I moved there, man that car owed me nothing, but to dyno it, I agree with MrSelfDestruct, I wouldn't have dealt with the embarrassment

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Scorps

A engine dyno is where they pull your engine out of your car and test it that way to get the flywheel HP if you just drive to a Dyno and do it that way you get the HP at the wheels, which is always less!

m5man

My 401 AMC Spirit GT with a Richmond 5-speed and a 2.87 gear was built for street and some road racing. It has been dynoed twice, in 2000 at 302 hp.and 390 ft.lb. at the rear wheels and at the 2003 Bristol Bash with a fresh engine,a better high torque cam and the new Air-Gap intake it showed 323 hp. and 410 ft.lb. at the rear wheels. This means at the engine SAE net = 372 hp. and 471 ft lb.

gigawatz

Man, I really like to know what it was, I have a '96 version of that car. See if you can get that info, cause right now w/o mods, I might as well be one of those guys with a Centry.

Scorps

get a 350 for that thing man...V6's are weak!

poof

I make my living fixing things and troubleshooting using a dyno. You know the truck/car is running well when you have to chain it down.

joshibahn

1987 Volvo 740 Turbo (b230ft Kblock bored to 2.5L)
272 hp at the wheels with 19lbs boost
251 lbft torque

Air Intake
ceramic ball bearing turbo
Greddy waste gate
Greddy ProFec
Greddy Blow-off valve
Custom built 3" downpipe to Random Technologies 3" cat
3.5" exhaust all the way back
port and polish
head work
copper gaskets
new injectors (can't remember what flow #'s)
Spearco Intercooler
Greddy Rebic IV (Sub-Injector Controller)
Under Drive pulleys

and don't say that motors can be weak because of cylinders or displacement, this was an in-line 4.....

fun car, damn ex-wife made me sell it when we were broke...the next guy fixed the alternator for 50$....

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irseg

I don't talk to him that often, but I'll find out next time I do. His is a '97. At some point in the mid 90s they went from 140 to 145 (whoop de doo!) flywheel HP.

I haven't really heard of too many people modding that engine. There isn't much available for the naturally aspirated 3.8 (they made an SC version but everything down to the block and heads was beefed up to handle the power), plus V8/supercharged V6 T-Birds/Cougars/Mark VIIIs are cheap and easy to come by.

cr25ovet

287 rwhp that was a 99 cobra. don't have the car anymore. don't remember trq. was pretty close the same like 291 i believe. just had a few bolt ons almost stock.

BadNick

I dyno'd my car twice.

First time slightly moded, my stock clutch started slipping at 360rwhp so I stopped, went home, saved money for a heavy duty clutch, went back a few months later, dyno'd 435rwhp/455rwtq. I've been to lots of dyno sessions just to participate with local car club members and help out but I won't need to dyno again until I perform further substantial mods and I want to confirm results or tune under conditions difficult to maintain on public roads ...like tuning a fuel control computer at full throttle at high boost ...it's not responsible to go 170+mph on public roads. Disclaimer: or call it responsibility claimer or justification of absurd dangerous behaviour: on public roads I drive very responsibly, residential areas I go speed limit or slower, but I race on race tracks a few times a year and hammer it on open highways when nobody is anywhere in sight and I want everything in my car to work properly.

silent_jay

460 Cobra Jet go big or go home, that's what needs to be in the T-Bird. It will end up in my Cougar someday, either that of a supercharged V-12 from a Jag, oh the days of driving this car, I haven't moved it in about 4 years

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EVIDENT

This is a hemi:


This is a pentroof head:


One thing that a hemispherical head will never have is four valves per cylinder. The valve angles would be so crazy that the head would be nearly impossible to design. Having only two valves per cylinder is not an issue in drag racing or NASCAR because racing engines are limited to two valves per cylinder in these categories. But on the street, four slightly smaller valves let an engine breath easier than two large valves. Modern engines use a pentroof design to accommodate four valves.

Another reason most high-performance engines no longer use a HEMI design is the desire to create a smaller combustion chamber. Small chambers further reduce the heat lost during combustion, and also shorten the distance the flame front must travel during combustion. The compact pentroof design is helpful here, as well.


taken from :http://auto.howstuffworks.com/hemi5.htm

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bad30th

a hemi is a hemi is just another engine design is a hemi

silent_jay

yep

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zfleebin

I dont know why everyone loves to hate the hemi but its actually a pretty nice engine. My truck weighs over 6,000 lbs and the not so exciting engine you guys are talking about makes my truck seem like it weighs nothing. Anybody who is interested in trucks might also take note of a quote off the Kenne Bell site. "The Hemi made more power than any naturally aspirated stock truck engine we ever dyno tested. And the mighty Hemi lived up to it's legacy by easily producing over 500HP with the Kenne Bell supercharger kit." Now I will agree with you guys that the commercials were laughable and dodge jipped us on a computer but I would hold off on dismissing the hemi as just another engine until we get some tuners out for it.