Ran a 11.48 at 116.88mph...opinions please!
#1
Ran a 11.48 at 116.88mph...opinions please!
So last night I finally ran my 1970 firebird down the 1/4 mile after a year or so of building it. I personally thought the car was going to trap at least 120mph. Heres the specs on the car. The car turned a 11.48 at 116.88mph in the 1/4 and a 7.3ish at 95mph in the 1/8 mile. My best 60' foot was a 1.676
LQ4 408 stroker
4.030" bore
Quench .037"
Wiesco -8cc forged pistons
Eagle forged 6.125 rods
Callies Compstar 4" forged crank
ARP 2000 rod bolts
Comp cam hardened 7.400 pushrods
LS7 lifters
Stock LS3 heads with 2.16/1.59 valves
Lunati Gold Dual Valve Springs .660 lift
Unported Victor Jr.
Pat G Cam (231/242 .615/.617 110)
Dynatech 1 7/8" long tube headers into 3" X pipe and 2.5" sweet thunder mufflers and cut outs after the headers
Quick Fuel Carb 750cfm mechanical secondaries
Static compression ratio... 10.7:1
Dynamic compression ratio... 8.49:1
3000 Stall Converter
Turbo 400
Denny's nitrous ready driveshaft
12 bolt with 3.73 posi
275/60/15 Mickey Thompson drag radials on aluminum wheels
Shifting at 6800 with rev limiter at 7000rpm
Weight of car probably in the 3400-3600 range.
I think my base timing was set at 20 degree and max was 33 degree, can't exactly recall.
I was foot braking leaving the tree at 2600rpm and running a small 10" paper air filter since thats all that fits under my shaker scoop currently. I think the air filter is really hurting me and running with the cutouts closed. Since this was also my first time running the car it doesn't have the proper AFR. I also have skinny front tires to put on the car next time!
I'll appreciate any opinions from people... I just thought the LS3 408's should trap in the 120's.
Thanks
LQ4 408 stroker
4.030" bore
Quench .037"
Wiesco -8cc forged pistons
Eagle forged 6.125 rods
Callies Compstar 4" forged crank
ARP 2000 rod bolts
Comp cam hardened 7.400 pushrods
LS7 lifters
Stock LS3 heads with 2.16/1.59 valves
Lunati Gold Dual Valve Springs .660 lift
Unported Victor Jr.
Pat G Cam (231/242 .615/.617 110)
Dynatech 1 7/8" long tube headers into 3" X pipe and 2.5" sweet thunder mufflers and cut outs after the headers
Quick Fuel Carb 750cfm mechanical secondaries
Static compression ratio... 10.7:1
Dynamic compression ratio... 8.49:1
3000 Stall Converter
Turbo 400
Denny's nitrous ready driveshaft
12 bolt with 3.73 posi
275/60/15 Mickey Thompson drag radials on aluminum wheels
Shifting at 6800 with rev limiter at 7000rpm
Weight of car probably in the 3400-3600 range.
I think my base timing was set at 20 degree and max was 33 degree, can't exactly recall.
I was foot braking leaving the tree at 2600rpm and running a small 10" paper air filter since thats all that fits under my shaker scoop currently. I think the air filter is really hurting me and running with the cutouts closed. Since this was also my first time running the car it doesn't have the proper AFR. I also have skinny front tires to put on the car next time!
I'll appreciate any opinions from people... I just thought the LS3 408's should trap in the 120's.
Thanks
#2
TECH Fanatic
iTrader: (24)
1/4 mile time is pretty good considering the 60' and mph. Maybe losing some on the top end from that filter. Could try a little more converter stall, maybe 3500-3600, don't know how much you drive on the street though.
Max timing might be a little high. Remember with these lsx engines, just because it's taking the timing without knock, doesn't mean it's making more power.
Oh, and what was the DA?
Max timing might be a little high. Remember with these lsx engines, just because it's taking the timing without knock, doesn't mean it's making more power.
Oh, and what was the DA?
#3
11 Second Club
iTrader: (18)
Looks like it's running pretty well for the first time out.
Air filter, cutout closed, and improper air/fuel...you pretty much answered your own question in the post.
Your car is running pretty much identical MPH in the 1/8 and 1/4 as mine, but .2 faster in both on a similar 60ft and similar weight. Do some tuning and it will pick up. The TH400 is going to hurt your MPH though.
Air filter, cutout closed, and improper air/fuel...you pretty much answered your own question in the post.
Your car is running pretty much identical MPH in the 1/8 and 1/4 as mine, but .2 faster in both on a similar 60ft and similar weight. Do some tuning and it will pick up. The TH400 is going to hurt your MPH though.
#4
I'm racing at sea level, Sonoma Raceway, aka Infineon/Sears Point. Yea its a street/strip car I had originally planned on getting a 3500 stall but found a killer deal on the tranny and stall for 500 bucks... so figured I'd run that and see what it did. I was just concerned on how much power my engine is making due to the low MPH. I was under the impression a 408 LS3 should be making at least 550hp, not sure if I messed something up in the build or not? Even though horsepower doesn't matter only ET's! I'll post some videos later of the in car and outside the car.
#5
Looks like it's running pretty well for the first time out.
Air filter, cutout closed, and improper air/fuel...you pretty much answered your own question in the post.
Your car is running pretty much identical MPH in the 1/8 and 1/4 as mine, but .2 faster in both on a similar 60ft and similar weight. Do some tuning and it will pick up. The TH400 is going to hurt your MPH though.
Air filter, cutout closed, and improper air/fuel...you pretty much answered your own question in the post.
Your car is running pretty much identical MPH in the 1/8 and 1/4 as mine, but .2 faster in both on a similar 60ft and similar weight. Do some tuning and it will pick up. The TH400 is going to hurt your MPH though.
#6
11 Second Club
iTrader: (18)
Yes I am running a stock shortblock ls1. Cubes can bring more power but often not as much as people think comes from cubes alone as it does from the ability to run larger cam and heads effectively.
Your biggest thing is that you need to get the air/fuel tuned. It could be costing you all the MPH you are looking for alone, never mind if it's starving for air through the filter.
Your biggest thing is that you need to get the air/fuel tuned. It could be costing you all the MPH you are looking for alone, never mind if it's starving for air through the filter.
#7
Heres the two videos of the car:
In car:
http://www.youtube.com/watch?v=JUs0l...ature=youtu.be
Outside of car:
http://www.youtube.com/watch?v=IPIk3...ature=youtu.be
In car:
http://www.youtube.com/watch?v=JUs0l...ature=youtu.be
Outside of car:
http://www.youtube.com/watch?v=IPIk3...ature=youtu.be
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#9
Pat G did spec that cam for my setup. I'm looking for 550-600hp at the crank and I kept the compression ratio lower for pump gas and I thought dynamic compression was more important than the static anyway... which I had specced for the most on 91 octane.
#12
12 Second Club
iTrader: (2)
You seem content with the et but bummed about the trap...I have a second gen TA also , my first thought is that a second gen is a brick compared to a 4th gen and trap will suffer when you have worse aerodynamics here is a pic of my 2nd gen parked between 2 of my 4th gens , look at the difference in how upright the windshiled is in particular - I also have a 10" filter up into my shaker but on a 400 pontiac slug , needs an ls lol
#13
You seem content with the et but bummed about the trap...I have a second gen TA also , my first thought is that a second gen is a brick compared to a 4th gen and trap will suffer when you have worse aerodynamics here is a pic of my 2nd gen parked between 2 of my 4th gens , look at the difference in how upright the windshiled is in particular - I also have a 10" filter up into my shaker but on a 400 pontiac slug , needs an ls lol