Hp question - Page 2 - ZR-1 Net Registry Forums

XfireZ51 · 03-30-2012

Quote:

Originally Posted by efnfast

Correction number was .96 as I remember. To convert to SAE.
He mentioned NH correction numbers are usually low.

Did he pull the .96 out of his butt or was that the correction factor for that time and day. Dyno should calc the CF each time. Also, on the Dynojets, there is a smoothing factor. It cuts off peaks and valleys. A setting of 1 gives you the actual peak number. Could be a diff of +/- 5 depending.

efnfast · 04-01-2012

No, he showed me on the screen what the correction number should be. Still , I think I'm happy with this number. Jones'en to get the exhaust done.

SteelBlueZR1 · 04-01-2012

Also, the Corvette action center has a GM engineering document that states the drivetrain loss for ZF6 wheel HP calculations as 16%. My ZR1 1991 with chip only dynoed at 321 rwhp yesterday. 321/.84 = 382 crankshaft HP. A 91 zr1 with chip + exhaust dynoed at 340 yesterday, so all the numbers and power gains make sense.

Bob Eyres · 04-02-2012

Most stock 91's I've seen dyno in the 320-340 range. Mine with headers and 3" exhaust only did 336 at the wheels, (not great).
Keep it cool, open up the airflow, it'll scream.

BTW, love that "Steel Blue"

efnfast · 04-02-2012

Headers and exhaust go on as soon as it comes back from Swaintech. It's got a K&N in the stock air box, I think I'll change to an S&L with the claw design and three filters, not sure if that is money well spent or not. Then a Marc chip once I know what mods I've made. I'm not going to dyno again untill I get all of this stuff done. Wish I could do it between every mod, but I'd rather invest that dough into hp.

04-01-2012	#12
efnfast Join Date: Nov 2011 Location: Dunbarton NH Posts: 7,540	Re: Hp question No, he showed me on the screen what the correction number should be. Still , I think I'm happy with this number. Jones'en to get the exhaust done.

04-01-2012	#13
SteelBlueZR1 Join Date: Aug 2011 Location: Evergreen, Co. Posts: 344	Re: Hp question Also, the Corvette action center has a GM engineering document that states the drivetrain loss for ZF6 wheel HP calculations as 16%. My ZR1 1991 with chip only dynoed at 321 rwhp yesterday. 321/.84 = 382 crankshaft HP. A 91 zr1 with chip + exhaust dynoed at 340 yesterday, so all the numbers and power gains make sense.

04-02-2012	#14
Bob Eyres Join Date: Jul 2005 Location: Jupiter, Fl. Posts: 813	Re: Hp question Most stock 91's I've seen dyno in the 320-340 range. Mine with headers and 3" exhaust only did 336 at the wheels, (not great). Keep it cool, open up the airflow, it'll scream. BTW, love that "Steel Blue"

04-02-2012	#15
efnfast Join Date: Nov 2011 Location: Dunbarton NH Posts: 7,540	Re: Hp question Headers and exhaust go on as soon as it comes back from Swaintech. It's got a K&N in the stock air box, I think I'll change to an S&L with the claw design and three filters, not sure if that is money well spent or not. Then a Marc chip once I know what mods I've made. I'm not going to dyno again untill I get all of this stuff done. Wish I could do it between every mod, but I'd rather invest that dough into hp.