fastest gm847 cars
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Joined: May 2002
Posts: 1,025
From: Saskatchewan, Canada
Re: fastest gm847 cars
Originally Posted by calfirebird
Mine with Le2 heads makes 417rwhp with a 2800 and all i can manage is 11.80 at 115. with 342s out back. It also has the 847 cam. with stock suspension. I know the car can run faster but why am i 4-5 mph slower? Yea tq management is a mother of an issue.
Thread Starter
Registered User
Joined: Aug 2005
Posts: 162
Re: fastest gm847 cars
my heads are only 190cc so id be maxing them out prob with the 847, but what i wanna know is how some guys are running 11.8's and others run 11.06? i doubt weight does that much.
Registered User
Joined: Apr 2006
Posts: 877
From: B'ville
Re: fastest gm847 cars
The weight has alot to do with it, the lighter the car the faster it goes. I guess it's all in the combination gears, trans, tunning etc.. etc... I also plan on running a simular set up as jeffs. Mine will be a 383 or a 357 with the LE3 heads and cam which is bigger than the GM847. I just hope to run simular times.
Registered User
Joined: Oct 2003
Posts: 739
From: Chicago, IL
Re: fastest gm847 cars
Excellent info.. My car is a fat pig and needs a diet i think with that and a 12 bolt i can see 11's in the future, But now I wanna throw some ported Trick flows on and see what this stock bottom end can do with the 847.
Last edited by My Iroc Z28; Jul 31, 2006 at 09:32 PM.
Registered User
Joined: Apr 2006
Posts: 877
From: B'ville
Re: fastest gm847 cars
I'm going with a tubular K-member with the a-arms BMR claims that with this set up with Qa1 shocks and lighter brake system you can loose up to about 100lbs that's alot of weight. I assume that a standard Z28 weighs about 3500lbs. Remove bumper supports, and all the other stuff not needed and you can weigh in a 3400 to 3300lbs.
Registered User
Joined: Dec 2003
Posts: 2,724
From: Oklahoma where trees are made of wood.
Re: fastest gm847 cars
Originally Posted by calfirebird
Mine with Le2 heads makes 417rwhp with a 2800 and all i can manage is 11.80 at 115. with 342s out back. It also has the 847 cam. with stock suspension. I know the car can run faster but why am i 4-5 mph slower? Yea tq management is a mother of an issue.
I guarantee you will gain 3 mph just from going to 3.73s. Also you'd probably gain a tenth or 2 in the 1/4 as well.
3.42s lug the motor too much for this cam.
Registered User
Joined: Sep 2002
Posts: 490
From: tulsa ok
Re: fastest gm847 cars
Originally Posted by WS Sick
The biggest Obstacle my car has is that my present motor only has about 9.8:1 compression. I know Jeff has closer to 12:1 and his car is lightened.
also had 12.43:1 comp and 10.3 DCR flat top pistons
Registered User
Joined: Sep 2002
Posts: 490
From: tulsa ok
Re: fastest gm847 cars
Originally Posted by Jlo
Here is one of his vid's on LS1Tech, it's one of my favorites hands down, I just like this car alot looks awsome
Great job jeff. What clutch are you using??
http://www.ls1tech.com/forums/showthread.php?t=260288
click on the car pictue on the bottom.
Great job jeff. What clutch are you using??http://www.ls1tech.com/forums/showthread.php?t=260288
click on the car pictue on the bottom.
car prob weighed close to 3200-3300 with me in it and no roll bar
all BMR front to rear r-series qa1's comp eng rear shocks
Registered User
Joined: Dec 2003
Posts: 2,724
From: Oklahoma where trees are made of wood.
Re: fastest gm847 cars
Originally Posted by Z284thgen
it was on oct 30 when it did its best
I was thinking you ran a really really low 11 in the heat.