What do i need to hit 11.9-12.2 range - Page 2 - ZR-1 Net Registry Forums

flyin ryan · 05-22-2008

best power will happen between 12.8:1 & 13.1:1 on a naturally asperated well sorted out gasoline engine. i dynoed a 320 cube & 315 cube small block's, that i just finished, last week. used the same 750 carb on both. jetting, air bleeds & timing were actually quite a bit different for each engine. at the end of each days dyno i was right on those A/F numbers, i wasn't surprised at all, 98% of the time that's what i see is best. FYI both engines made 2.2 HP/cube. not the best but for what i was given to deal with (older parts ) pretty good.

05-22-2008

BTW. the fact that warmed-up fuel injected engines will run with mixtures as rich as 6.0:1 .
So guess when you driving your ZR in very cold weather and you are in WOT offen and you are lean in range 13.0 !

Aurora40 · 05-22-2008

From watching the cars at BG that were running street tires, really what you'll need is a lot more horsepower. If you don't want to cut down your short game with DR's, then you'll have to cut down the longer game with hp.

I believe Ron K's times were mostly high 11's, 12 flat from a 390 with 2.0+ 60' times. There was one or two guys with 350's that were running 12 flat or high 11's because they had DR's on and were launching much harder.

So you can either go the 12.0 @ 115mph route with DR's, skinnies, other drag prep, or you can go the 12.0 @ 125mph route with a crapload of horsepower and not enough traction.

I know what you are saying about running like it runs on the street. I didn't even pull my spare tire out, though mostly out of laziness.

But I was running mid 12's all day, with trap speeds that a lot of cars get in the 11's. If you want a low ET, though, the cheapest and easiest way would be to prep the car for the dragstrip.

rkreigh · 05-22-2008

street tires make hooking the ZR-1 ver diecy at best

even with drag radials, if the car isn't setup for the digs, 60 fts are in the 1.8 range

bolt on some slicks! or a drag pack. watch the 60 ft and the ET tumble

127 MPH shows the power needed for 10s, but without traction it just isn't going to happen. car has run 11.46 with a better driver, but that was with a high 1.7 60 ft, drag radials, and a 126 mph

I'm going to run the hoosiers soon, and I expect to be back in the mid 11s or better if I can get the clutch to hold.

still running a stock clutch and it's really not up to the torq the little 390 can deliver.

I've seen MANY cars with mods like yours dip into the 11s with decent traction and a good driver. that makes all the difference in the world as the ZR-1 isn't an EZ car to drag race due to the still suspension.

my coil overs don't help there either

bradslt5 · 05-22-2008

drag pack ????? can you help shed some light on this .i too am searching for ways to imptove the launch if our cars . the hoosiers really help a bunch ,having just got a set. they would work better on 12 in rims though .i have loosened the front swau bar and put 45lbs of air in thew front tires .i am wondering if other rear shocks would help . i have tried all 3 settings on fx3 and it doesnt seem to make a diff . any ideas ????

05-22-2008

Dont forget, Move the battery to the rear storage!
i have this kit already...

bradslt5 · 05-22-2008

hadi where did you get the kit?

05-23-2008

Quote:

Originally Posted by bradslt5

hadi where did you get the kit?

Search for Battery relocate kit in : SUMMIT RACING.com , i got it from there.
and my advice use Odessy battery PC925. small and light .

Locobob used it. but USPS refused to ship the battery by air!

rkreigh · 05-23-2008

the drag pack is ccw race rims 16" in back and 17" skinnies in front.

they hook like crazy! M&H, ET Streets, and Hoosiers all make a pretty good drag radial but slicks are even better.

thanks for the tip on the battery, where are they available Hadi??

bradslt5 · 05-23-2008

summit. oll cruize over there and see if i can snag some part numbers

05-22-2008	#11
flyin ryan Join Date: Aug 2006 Location: Edmonton, Alberta or Phoenix, Arizona Posts: 2,741	Re: What do i need to hit 11.9-12.2 range best power will happen between 12.8:1 & 13.1:1 on a naturally asperated well sorted out gasoline engine. i dynoed a 320 cube & 315 cube small block's, that i just finished, last week. used the same 750 carb on both. jetting, air bleeds & timing were actually quite a bit different for each engine. at the end of each days dyno i was right on those A/F numbers, i wasn't surprised at all, 98% of the time that's what i see is best. FYI both engines made 2.2 HP/cube. not the best but for what i was given to deal with (older parts ) pretty good. __________________ There are no limit's mans ingenuity, just as mans ingenuity will never conquer the forces & behavior of this planet...Smokey Y.

05-22-2008	#12
HADI-ZR1 Guest Posts: n/a	Re: What do i need to hit 11.9-12.2 range BTW. the fact that warmed-up fuel injected engines will run with mixtures as rich as 6.0:1 . So guess when you driving your ZR in very cold weather and you are in WOT offen and you are lean in range 13.0 !

05-22-2008	#13
Aurora40 Join Date: May 2005 Location: Leesburg, VA Posts: 2,713	Re: What do i need to hit 11.9-12.2 range From watching the cars at BG that were running street tires, really what you'll need is a lot more horsepower. If you don't want to cut down your short game with DR's, then you'll have to cut down the longer game with hp. I believe Ron K's times were mostly high 11's, 12 flat from a 390 with 2.0+ 60' times. There was one or two guys with 350's that were running 12 flat or high 11's because they had DR's on and were launching much harder. So you can either go the 12.0 @ 115mph route with DR's, skinnies, other drag prep, or you can go the 12.0 @ 125mph route with a crapload of horsepower and not enough traction. I know what you are saying about running like it runs on the street. I didn't even pull my spare tire out, though mostly out of laziness. But I was running mid 12's all day, with trap speeds that a lot of cars get in the 11's. If you want a low ET, though, the cheapest and easiest way would be to prep the car for the dragstrip. __________________ Bob Saveland Former owner of #2517 [IMG]http://a.random-image.net/aurora40/vette.jpg[/img]

05-22-2008	#14
rkreigh Join Date: Jan 2004 Location: Alex VA Posts: 1,087	Re: What do i need to hit 11.9-12.2 range street tires make hooking the ZR-1 ver diecy at best even with drag radials, if the car isn't setup for the digs, 60 fts are in the 1.8 range bolt on some slicks! or a drag pack. watch the 60 ft and the ET tumble 127 MPH shows the power needed for 10s, but without traction it just isn't going to happen. car has run 11.46 with a better driver, but that was with a high 1.7 60 ft, drag radials, and a 126 mph I'm going to run the hoosiers soon, and I expect to be back in the mid 11s or better if I can get the clutch to hold. still running a stock clutch and it's really not up to the torq the little 390 can deliver. I've seen MANY cars with mods like yours dip into the 11s with decent traction and a good driver. that makes all the difference in the world as the ZR-1 isn't an EZ car to drag race due to the still suspension. my coil overs don't help there either __________________ 95 390 LPE ZR1 (505 rwhp) LSV = Lingenfelter Super Vette Twin Turbo 2003 Z06 (800 RWHP)

05-22-2008	#15
bradslt5 Join Date: Oct 2007 Location: lone pine and mammoth lakes ca. Posts: 544	Re: What do i need to hit 11.9-12.2 range drag pack ????? can you help shed some light on this .i too am searching for ways to imptove the launch if our cars . the hoosiers really help a bunch ,having just got a set. they would work better on 12 in rims though .i have loosened the front swau bar and put 45lbs of air in thew front tires .i am wondering if other rear shocks would help . i have tried all 3 settings on fx3 and it doesnt seem to make a diff . any ideas ????

05-23-2008	#19
rkreigh Join Date: Jan 2004 Location: Alex VA Posts: 1,087	Re: What do i need to hit 11.9-12.2 range the drag pack is ccw race rims 16" in back and 17" skinnies in front. they hook like crazy! M&H, ET Streets, and Hoosiers all make a pretty good drag radial but slicks are even better. thanks for the tip on the battery, where are they available Hadi?? __________________ 95 390 LPE ZR1 (505 rwhp) LSV = Lingenfelter Super Vette Twin Turbo 2003 Z06 (800 RWHP)