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Dragstrip and Launch Techniques Discussion 1/4 mile, 1/8 mile, launch discussions.

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Old 04-03-2009, 07:15 AM   #1
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SRA would give the Camaro a half second in the quarter?

I have a friend who's a car guy, though admittedly more into old cars. We talk about my new Camaro occasionally, and the other day he said something like this "Its too bad the Camaro doesn't have a solid rear axle". I pointed out its somewhat archaic technology, and IRS gives you better handling performance, he says "well yeah, if you want a smoother ride IRS is better, but a solid rear axle would probably gain it like 1/2 a second in the 1/4 mile." I felt like this was a bit bogus, as there's not a half second's worth of traction issues in the IRS Camaro. Can anyone shed some light on this? Give me their opinions?
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Old 04-03-2009, 09:54 AM   #2
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SRA is good for straight lines, no doubt. Unless you plan on living at the track, you should be ecstatic the used IRS.
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Old 04-03-2009, 03:17 PM   #3
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with 20's? no freak'n way. doubt it would make any difference

with 15' wheels and a 28X10.5 slick? ya, it would probably help out a quite a bit.
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31000 for ss1 no options and who in the hell would buy a SS1 V6 for kids SS1 for girls LS3 the only way to go G8 Gxp 200lbs more my bad so lets think here 200lb more 27 less hp so 5 tenths slower now 373 gear now mabe 3tenths slower 4 door car sad so so sad
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Old 04-03-2009, 03:20 PM   #4
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I have more faith in the R&D at GM and the bean counters than I do random SA/IRS opinions

Grant it, SRA would be a touch better in the 1/4 mile, but look at the bulk of the Camaro buyers, V6 cars for one and only a VERY small percentage of all camaros sold will see a drag strip

It comes down to the $$ and majority sales.
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Old 04-03-2009, 03:28 PM   #5
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a tenth... maybe... no more than that on a stock car.
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Old 04-03-2009, 05:27 PM   #6
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A half second?... Hmm. We'll get an idea on how efficient the powertrain is when we start getting more dyno' numbers, but from the one that I know of, it seems the powertrain is either pretty efficient, or the LS3 is underrated. That being said (opinion only) if those numbers are accurate, I don't see too much a benefit of adding SRA other than strength and weight.
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Old 04-06-2009, 10:52 AM   #7
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Most of that gain would be in the 60ft time, but probably not a 1/2 second. I like drag racing but I'm glad GM went with IRS. Much better package overall.
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Old 04-06-2009, 11:08 PM   #8
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overall tire hight is the same for 18'' 19'' and 20''
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Old 04-06-2009, 11:34 PM   #9
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Quote:
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overall tire hight is the same for 18'' 19'' and 20''

and???
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31000 for ss1 no options and who in the hell would buy a SS1 V6 for kids SS1 for girls LS3 the only way to go G8 Gxp 200lbs more my bad so lets think here 200lb more 27 less hp so 5 tenths slower now 373 gear now mabe 3tenths slower 4 door car sad so so sad
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Old 04-07-2009, 08:51 AM   #10
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No way .. not a half second .. lol ... maybe a tenth or so as I believe you will have a little less drivetrain loss without the IRS and it is a bit easier to launch ..

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Old 04-08-2009, 10:49 AM   #11
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Eventually you'll read about guys putting sra under the car, but only after they take the rest of the drivetrain torque so hi it breaks. These guys won't be looking for twisty roads to play on.

For daily driving and occasional 1320 runs, IRS should be just fine up to it's gobs of horsepower breaking point.
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Old 04-11-2009, 10:10 PM   #12
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There's definitely a straight line advantage for a solid axle. This comes from three things:

1) Rear tires are square to the ground (an IRS cambers the tires when the tail squats)
2) Less parasitic losses (IRS has more joints)
3) Less system weight

A half a second sounds overly optimistic for cars in this power range, though. I'd put it more in the range of .15 seconds.
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Old 04-20-2009, 11:41 AM   #13
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2 tenths maybe 3 at the most
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Old 05-06-2009, 01:20 PM   #14
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No way would switching to a SRA save an entire half second. Shaving half a second takes some effort in the drag racing world especially when you are in the low 13s/high 12s to begin with.

The SRA should eliminate some wheelhop, but nothing spectacular.

I'm with the others. I would expect maybe 0.2 tenths of an improvement with a SRA.
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Old 05-21-2009, 11:19 AM   #15
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I did a detailed study of this on my 2003 Cobra.

The IRS in that car weighed 122-lb more than the Solid axle. So just on the weight alone, it should be almost -0.2 sec ET.

The Dyno testing I did between the two drivelines showed +23 rwhp for the Solid over the IRS due to the 1/2 shaft joints have to be at some angle to keep it all stable. This is worth about -0.20 sec.

My car went from 13.20's with IRS to 12.80's with the solid axle. The SN95 Mustang is the only car that you can do this apples to apples testing between the IRS and SRA.

I would say we should get -0.40 sec with a solid on the new Camaro. I would love one in my car! I'm trying to get the weight out of this thing!
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Old 05-21-2009, 12:29 PM   #16
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Quote:
Originally Posted by Camaro4466 View Post
I did a detailed study of this on my 2003 Cobra.

The IRS in that car weighed 122-lb more than the Solid axle. So just on the weight alone, it should be almost -0.2 sec ET.

The Dyno testing I did between the two drivelines showed +23 rwhp for the Solid over the IRS due to the 1/2 shaft joints have to be at some angle to keep it all stable. This is worth about -0.20 sec.

My car went from 13.20's with IRS to 12.80's with the solid axle. The SN95 Mustang is the only car that you can do this apples to apples testing between the IRS and SRA.

I would say we should get -0.40 sec with a solid on the new Camaro. I would love one in my car! I'm trying to get the weight out of this thing!
That is pretty good.... I had a friend that did an IRS/SRA swap on an 2001 Cobra, but he also added 3.73 gears and drag radials.....all together he dropped 0.6-0.7 seconds from his 1/4 mile time, but at least half that improvement was from the 3.73:1 gears and drag radials....
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Old 05-21-2009, 12:45 PM   #17
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You will have some gain, but unless you have appreciable wheel spin (which you won't with a stock V-8) then you are probably better off spending your money elsewhere. Plus for the other 99% of your driving, the IRS is far more suited to the superior ride and handling characteristics of the new Camaro.

Tires can give you the best bang for the buck with a fairly stock engine.

Look at the recent tests one of the Source Interlink mags just did on the 20" Nitto Drag Tire, they picked up 2-3 tenths.

A good way to do it is to have your stock tires/wheels for daily drivers and a dedicated set of tires/wheels for the drags. No single tire does everything well.

Just another .02 to think about.
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