Dragracing Weight question!!

[scot w.]

Okay I was just at our local cruise in tonight and was talking to a guy with a 2006 GTO that had the 400hp/400tq LS2 in it and asked him what it runs, he replied "8.60's in the 8th"... Then I asked him how much the car weighed and my guess was 4,000lbs but he said something like 3,000... So this got me to thinking and doing some research and comparisons but got stuck on one part, ''How much his time would change with the weight savings of 1,202 lbs"??

Here are the stats;

* Actual GTO Weight:........ 4,491 lbs
* My current Buick weight:. 3,389 lbs

Buick is Lighter by:............ 1,102 lbs


NOW you take that LS2 and put it in a Buick regal it will shave Another 100 lbs off that bringing the total weight savings to 1,202 lbs

Now by shaving 1,202 lbs, what would that kind of weight savings do to that 8.60 time?



Scot W.

 

[charlief1]

Well are you planning on cutting that much off your car Scott? That much weight will give you about .7 in the quarter if my math is right. Of course there are other factors to consider as well. Total weight is just a small part of it after all. Weight transfer will also change.

Something else you might consider is doing a comparison between an LS engine and a Series II engine. If you haven't read it yet there a hybred conversion to using a Series II Buick V6 and he's in the 10's with I believe 18 PSI with fantastic throttle response.

 

[scot w.]

Well are you planning on cutting that much off your car Scott? That much weight will give you about .7 in the quarter if my math is right. Of course there are other factors to consider as well. Total weight is just a small part of it after all. Weight transfer will also change.

Something else you might consider is doing a comparison between an LS engine and a Series II engine. If you haven't read it yet there a hybred conversion to using a Series II Buick V6 and he's in the 10's with I believe 18 PSI with fantastic throttle response.

I was just using my car weight as the example. I knew there was an equation that would be used, just didn't know what it was...

I'm not switching anything right now, This guy's car got me thinking Hmmmm wonder what times he would run if he was at my cars weight?


So 1,202 lbs will only gain you .7 ??? I would have guessed more....


SW.

 

[John Wilde]

Scot play around with the numbers here:

TCI® - Sorry...

 

[Bent6]

Assuming the LS swap would drop your car to 3289#s, that should net somewhere around a 7.50 eighth mile time on paper.

 

[scot w.]

Assuming the LS swap would drop your car to 3289#s, that should net somewhere around a 7.50 eighth mile time on paper.

Exactly Will, That's what I was looking for....

I was wondering what that much weight difference would do to that 8.60 time..


Scot W.

 

[scot w.]

Scot play around with the numbers here:

TCI® - Sorry...

Don't help me much, His time was in the 1/8th not the 1/4...


SW.

 

[charlief1]

Plugged the wrong numbers in Scott.:redface: I ment in the 1/8 th.:biggrin: What are you currently running in the 1/4?

 

[scot w.]

Plugged the wrong numbers in Scott.:redface: I ment in the 1/8 th.:biggrin: What are you currently running in the 1/4?

Don't know! Since I bought the car all it's been on is 1/8th mile tracks.. At the TB.com event it went 7.90 @ 91.0 on 20lbs boost with a 1.82 60' time on my street tires.

I thought when Clint weighed my car there it weighed in at 3280 without me in it.. Not positive on the exact number, maybe Clint has some paper work of the weights somewhere...

When I scaled the car it came to 3386 from all 4 corners Total...



SW.

 

[scot w.]

That guy said his GTO was all stock except for a ported throttle body and intake and he's running 8.60's... That isn't much to us compared to cars like mine who would have killed him but I guess we all have to take the vehicle weight into account cause if you were to ADD 1,202 lbs to my car I'm sure it would slow down and be pretty darn close to that time...

I have friends who look at a car like the 2006 GTO and say "Those are slow, I beat several of them".. Well to a point they are 100% correct but it damn sure isn't the engine making them slow, It's the weight!! That's a Lot of weight difference!!!!


Oh Well, That just made me curious tonight...


Scot W.

 

[Alky V6]

If the GTO were to drop 1,202 lbs, he would drop .86 off the 1/8 mile time. I came up with this using very rough specs and the numbers you supplied in your thread, so don't assume this is accurate.

 

[novaderrik]

That guy said his GTO was all stock except for a ported throttle body and intake and he's running 8.60's... That isn't much to us compared to cars like mine who would have killed him but I guess we all have to take the vehicle weight into account cause if you were to ADD 1,202 lbs to my car I'm sure it would slow down and be pretty darn close to that time...

I have friends who look at a car like the 2006 GTO and say "Those are slow, I beat several of them".. Well to a point they are 100% correct but it damn sure isn't the engine making them slow, It's the weight!! That's a Lot of weight difference!!!!


Oh Well, That just made me curious tonight...


Scot W.

if the GTO is a manual trans car, then the driver could also be making it slower.. and don't forget about the '05 and '06 GTO getting a bigger and more powerful LS2 engine compared to the LS1 in the '04- and not too many people can actually tell the difference between an '04 and an '05-'06 GTO. plus the IRS setup in GTO's is said to be more finicky with WOT launches than the solid axle in a TR.

there are a lot of variables in these things. i remember when i absolutely wasted a brand new Mustang Cobra at a 1/8 mile track with my Nova back in '04. on paper and from everything i'd read about those cars, he should have soundly beaten me but i got him by about 5 car lengths. i asked him about it afterwards, and he said that he was shifting it at 5000 rpm because he was afraid to blow it up and he was shifting it nice because he didn't want to hurt the clutch.. yes, he was afraid of blowing up a DOHC 4.6 in a Mustang Cobra if the engine went past 5000 rpm..

 

[John Wilde]

Don't help me much, His time was in the 1/8th not the 1/4...


SW.

Scot,

I was able to use the site on my phone and do a couple conversions.
-that car is making ~365hp
-that motor in your car would do a 7.7 in the 1/8 or 12.15 in the 1/4.
As Patrick Rubio would say; always make sure the juice is worth the squeeze.

 

[slow305]

Messing around with that web site, 1100 pounds is worth 100 hp. A Buick at 300 hp would run the same as a GTO at 400 hp. I think it's funny how much heavier cars have gotten on the last 30 years. I always used to think that they were lighter now then ever, but the Geo Metro only weighed about 1500 pounds while the Aveo weighs 2200 pounds.

 

[scot w.]

Scot,

I was able to use the site on my phone and do a couple conversions.
-that car is making ~365hp
-that motor in your car would do a 7.7 in the 1/8 or 12.15 in the 1/4.
As Patrick Rubio would say; always make sure the juice is worth the squeeze.

SO with that said John, My car would be faster (or very close to the same) with the LS2 in it?

Just imagine if it had a nice set of heads, Intake, and a Cam!! :biggrin:



Scot W.

 

[V8Assassin]

sounds like a special someone is interested in a gto engine pretty bad

 

[scot w.]

sounds like a special someone is interested in a gto engine pretty bad

It's just interesting looking at the actual numbers of this stuff. Oh and look who finally crawled out from under his rock!! :biggrin:

 

[Dusty Bradford]

I've been told by someone who has been racing door cars for a while now that every 100# in the 1/8 should net .06 off your time. Doesn't matter if it's a pro-stock car or daily driver. That would put you in the high 7's with just a motor change. A converter would put that in the easy mid-low 7's.

A local guy has a 1992 Mustang coupe. Bone stock LS engine from a 2000 Ram air. Only change is valve springs. We rigged up a very budget 76mm turbo kit using stock manifolds and it just went 7.0 at 96mph on 5 psi. He drives the car anywhere he wants and it never gets over 160*. I'm sure it will go 6.50-6.70 with 7-8 psi. Just a couple # of boost is making a huge difference.

 

[DailyDrifter]

Every 100lbs = .10 in the quarter correct? Keep in mind if the car is a 6 speed you have the benefit of higher gear ratios and can get the car moving a lot easier.

 

[Mr.Spool]

on my car i have noticed 100lbs=1 tenth and 1mph