1990 #2180 Dyno pull
 

If these numbers are accurate, I'm a happy camper :-D

RWHP 337
"corrected for temp/humidity/pressure" = 353

RWTQ 320
"corrected" = 335

(both at a whopping 5500 RPM or so)

They had some issues loading it on the dyno and by the time they were ready, the car was already pretty hot. I tried to convince him that redline was a little higher too ...

There was only one useful pull, and here are the sheets

http://i517.photobucket.com/albums/u...ps0d504fa4.jpg


http://i517.photobucket.com/albums/u...ps19f93688.jpg

http://i517.photobucket.com/albums/u...psdf4fc2ad.jpg

The techs hadn't seen an LT5 in person, although several knew about it.

The only "mods" I have are Corsa exhaust and SLP claw intake. The engine runs great after I replaced the fuel injectors.

OK, gurus ... let me know your thoughts. Is this thing really 400HP at the crank?

Re: 1990 #2180 Dyno pull
 

yep, corrected thats 400-410 crank

Re: 1990 #2180 Dyno pull
 

HP was still climbing at 5653 RPM

Re: 1990 #2180 Dyno pull
 

I agree.... He heard the LT-5 roar and got scared!

shame he didn't take it further.

David

Re: 1990 #2180 Dyno pull
 

That's the same type of dyno (at least the website on the printout) that I ran my '92 on. The operator took my LT5 to the same rpm before shutdown.

Good numbers. With headers and a chip I would guess you will hit 370whp no problem!

Re: 1990 #2180 Dyno pull
 

Time to get headers and a ported top end....

Re: 1990 #2180 Dyno pull
 

:thumbsup:

Yup ... it got a little loud in there

http://s517.photobucket.com/user/Nat...aacb0.mp4.html

(I haven't hosted a video on photobucket before, so I'm not sure this will work)

Re: 1990 #2180 Dyno pull
 

My thoughts exactly. Power peak is too low. The WCF means With Correction Factor, but which one? SAE, Standard?

Re: 1990 #2180 Dyno pull
 

Strong numbers, to be sure.

Researching dyno calibration specs a bit, it appears (cutting to the chase) that a 4% variance exists between STD & SAE correction factors, stemming from the fact that SAE normalizes to 77ºF whereas STD normalizes to 60ºF

Also, the SAE 1349 spec requires correction for torque, relative to the mechanical efficiency (ME), or estimated at 85% at peak torque ONLY.

It is still a little vague (to me) how ME is affected when the engine is producing other than peak torque, but intuition tells me as counter rotational force (drive train inertia) diminishes, ME increases. The result would be a reduction in calculated hp at those non-peak torque regions of the rpm band.

In any case, the dyno operator was obviously conditioned to lift when his ear told him he'd reached the limit of conventional pushrod motors. The sound of the LT5 screaming past 5500 on its way to 7k+ scares the crap outta some operators, and the unaccustomed as well.

Well...Now that the hook is set, it is time for some FBI top end porting...and then...and then... Yeah, speed is addicting! ;)

P.

Re: 1990 #2180 Dyno pull
 

put it on the real world dyno(track) and see how she does....