Dyno results
 

Ok so the local club grand prix took a trip to the dyno and i joined in.... the torque numbers seemed a little low for just about everyone...
This is what came out for me
145.06whp @ 4200
91.62wtq @ 4100

Doesnt that seem a little screwy?

That torque number is WAY too low.

Traction control pulling timing? I'm not as familiar with 00+, but is that a possibility?

But yes, that torque number is WAY low. HP is a little low, also.

thats what im sayin.. if it was that low i shouldnt have been able to lay a 12 foot patch leaving the parkinglot

i pulled the ABS fuse.. so nothing was holding it back

Does the car have stabiltrak? What model, year. Both of those numbers seem low. I'm guessing TM kicked in.

Did you pull your Wheel speed sensors?

Did you do the pull in 2nd gear?

You may want to read http://www.3800tech.com/forum/showthread.php?t=67

yes, second gear pull.

no stabilitrack or traction controll on the car.

wow, those are WAY low. I'd ask for a refund.....

there wasnt much for a refund.. it cost the club 300 for the day.. 15 people ran so it was really cheap

Would any of this be necessary if i dont have TCS?

its a 2000 SE btw

No TC or stabilitrak, pulled ABS fuse. Sounds like there dyno is jacked up. What were some other GP numbers?

they were all L67, and all had atleast a pulley... but their hp #s were
312 306 300 295 285 269 262 231 230 229 224

the 312 seemed short, he had stage 3 heads and cam, 2.7 pulley, Intercooler ported m90.... should have seen closer to 340

everyones toque seemed a little low.. usually 10-15 below what would be expected

HP is derrived from torque. Maybe the Dyno was off in the lower RPM readings.

there is no way that a 3.8 with IC, heads and a cam only makes 312hp

it sounds like they dyno was off...

I agree those numbers are way low... Even for an L36

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When I got my car dynoed they messed up on the RPM. It was doubled. So the 6000 RPM redline was now 12,000 Rpm. So, I had to multiply the tourque numbers by two.

my rpms are doubled on my dyno... is that true that if the rpm is off then the torque would need to be doubled???

How do dynos measure RPM? Do they clamp onto a spark plug wire and use induction? If so, our spark plugs fire every revolution. I don't actually know if most newer cars are that way, but I dont' think it's uncommon. Maybe it doesn't take that into account.

they did induction off of #1 wire

I'd say multiply that torque number by 2 then... 91 is just tooo whimpy... 182Ft Lbs sounds a bit better....


Does that sound right for the drivetrain loss... 230ft lbs to 182 ft lbs ?

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Re: Dyno results
 

It's still wrong. HP = ( Torque x RPM)/5250 Lets use the first figure...

145.06 HP = (116.048 ft/lb X 4200) / 5250

116lb/ft is higher the 91.62 as well, and there's no way your car is making peak torque above 4200 RPM either. This figure seems low for low RPMs even if we start dividing and such :roll:

Well, it is quite obvious the rpm isn't right since peak power and peak torque come at pretty much the same exact time, and its way too low for peak hp. (4100 and 4200) The hp number seems right, but the rpms don't. Do you have the chart? If hp & tq. don't cross at 5252rpm then there is obviously something wrong. If the rpm is off, the hp should still be the same the torque will just read different. I would bet you have to double the torque numbers.

Someones never been on ClubGP apparantly. There are many people with cam/heads/IC only making 312whp. Thats 390 crank hp. I'm not saying those numbers are right, because they probably aren't. But without tuning its pretty easy to not make a lot of power. For instance, take a look at this clubgp post. Its the hp records for each cam, go down and look at the Stage 2 cam, the second person on there. Yeah, I understand this is a smaller cam, but as an example. Stage 2 cam/heads/IC. And I'm pretty sure this was a well tuned car as well. So a little tuning on this car that only made 312 that we are talking about might have helped it. Or the dyno was off, you never know.

http://www.clubgp.com/newforum/tm.as...mode=1&smode=1

Shawn

Yes, thats the reason they gave me that it said I was turning 12,000 RPM. Just double you're torque numbers.

http://tinypic.com/1h9t1k

Heres mine. Notice the RPMs are doubled?

Re: Dyno results
 

145.06 HP = (181.325 ft/lb X 4200) / 5250

That sounds a lot better. ;)

Re: Dyno results
 

Oye, that's what I get for using the damn computer calculator instead of the Trusty Ti, or a paper... :roll:

Dumb question, it's a 4 stroke motor, so it takes two revolutions to doa full cycle, why is the spark plug firing every rev? Because of the matching cylinder on the ignition coil?

Something like that... GM DIS uses a waste spark method... The coil actually fires both plugs at the same time... The cylinder on the compression stroke requires more power to fire the plug, the opposing cylinder requires a lot less power to fire the plug, hence sending more of the power to the plug on the compression stroke...

Did I even explain that right :roll:

It works something like that....<---- To lazy to look it up...lol

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this is the crappy chart i got

http://www.geocities.com/safari307cid/dyno.gif

ITS BIG

Ive heard they use it to double burn the cylinder to clean up the exhaust.... thats why our cars easily pass e-checks left and right... but that is just what i heard...

It helps to prevent fouled plugs.

Yikes! Either there is something wrong with the dyno or you're car based on that chart. :shock:

Re: Dyno results
 

a Ti?

i'm more of an hp man myself... love my RPN...

Ti = texas instrument but I prefer the casio they cost a 1/3 of the price and do all the same things useing a small gui

i know it means texas instruments :) i've used a casio or two, and i was impressed, but i love my stacks and RPN too much...