1/4 mile

[_AJ_]

I had my first outing ever on the strip yesterday, and I was some what disappointed to say the least. I was just wondering if anyone else had ventured out, and what sort of figures they came home with.

The best of my 3 runs was 13.8921 for the quarter, at 102.27mph. It was quite warm, but these numbers are a fair bit different to those I would have expected from a VXR500.

[Bonnie and Clyde]

I felt the same. We have a CV8 and we were expecting better times. I think Cols best time was 15.6 and mine about 15.8. I just read your post out to Col and as he said they weigh almost two ton. I thought the Ro's would have been one of the fasted cars at the Pod last time but i got my ass handed to me by a Nova. Its just a big chunk of V8 muscle. Thats it.
Gorgeous looking and sounding but not really that quick compared to a lot of other things. Would'nt change it for the world though

[crisisjez]

VXR 500`s are non intercooled.

Try again in the winter, sounds like you were pulling about 100bhp due to heat.

RWYB days are really hard on FI cars.

Should have pushed it more.....

[AM04ARO]

It is very tough.

Mine was non intercooled when I ran - don't ask.

Big cars to get off the line.

[broadslide]

Hi AJ, I'm going to the Pod on the 16th with my VXR500 so will be able to compare times. Never been before so hope I don't cock it up to much.

[Bonnie and Clyde]

Jez whats the difference between VXR500 and yours. Hav'nt they both got Harrop SC's. Does the intercooler make a big difference?

[ringram]

yep, if temps are high not only will you lose timing, air mass will also drop substantially.
The lowest intake air temps possible is what you want.

Bring it down to vixpy's dyno day and see how it goes there.

Edited by ringram on Sunday 3rd August 20:12

[_AJ_]

crisisjez said:

VXR 500`s are non intercooled.

Try again in the winter, sounds like you were pulling about 100bhp due to heat.

RWYB days are really hard on FI cars.

Should have pushed it more.....

Well, I must admit, I wasn't too hard on it for the launches, but then I don't think you have to be with these cars. It was definately taking in too much hot air. I think as part of the conversion, the airbox is cut away on one side, and on this sort of event, I can imagine that that's of no help at all. You think as much as 100bhp?

Very interested to hear your time after you've run, Broadslide.

[monkfish1]

Bonnie and Clyde said:

I felt the same. We have a CV8 and we were expecting better times. I think Cols best time was 15.6 and mine about 15.8. I just read your post out to Col and as he said they weigh almost two ton. I thought the Ro's would have been one of the fasted cars at the Pod last time but i got my ass handed to me by a Nova. Its just a big chunk of V8 muscle. Thats it.
Gorgeous looking and sounding but not really that quick compared to a lot of other things. Would'nt change it for the world though

With the right conditions and right technique a stock CV8 should do a 14.2-3 sec 1/4.

[Magic919]

Bonnie and Clyde said:

and as he said they weigh almost two ton.

They are heavy, but not quite that heavy. About 1650KG.

[Bonnie and Clyde]

monkfish1 said:

Bonnie and Clyde said:

I felt the same. We have a CV8 and we were expecting better times. I think Cols best time was 15.6 and mine about 15.8. I just read your post out to Col and as he said they weigh almost two ton. I thought the Ro's would have been one of the fasted cars at the Pod last time but i got my ass handed to me by a Nova. Its just a big chunk of V8 muscle. Thats it.
Gorgeous looking and sounding but not really that quick compared to a lot of other things. Would'nt change it for the world though

With the right conditions and right technique a stock CV8 should do a 14.2-3 sec 1/4.

It was a hot day? Are you gonna be there on the 16th as i feel i'm getting a bit of lag changing from 1st to 2nd. Would like someone that knows what they are doing to take it down the quater. If i can rule out any probs i'll know its just my cack driving

[Stigmundfreud]

Bonnie and Clyde said:

I felt the same. We have a CV8 and we were expecting better times. I think Cols best time was 15.6 and mine about 15.8. I just read your post out to Col and as he said they weigh almost two ton. I thought the Ro's would have been one of the fasted cars at the Pod last time but i got my ass handed to me by a Nova. Its just a big chunk of V8 muscle. Thats it.
Gorgeous looking and sounding but not really that quick compared to a lot of other things. Would'nt change it for the world though

you had several issues though.

1.) it was your first time so you were gtting used to it
2.) those novas were stupendously modified. 300+ bhp tune engines gave them a massive power to weight ratio
3.) The car is very quick compared to most out on the road.Very quick 0-60 and 0-100. Those novas were not standard and at the end of the day they drove home in a nova

[monkfish1]

Bonnie and Clyde said:

monkfish1 said:

Bonnie and Clyde said:

I felt the same. We have a CV8 and we were expecting better times. I think Cols best time was 15.6 and mine about 15.8. I just read your post out to Col and as he said they weigh almost two ton. I thought the Ro's would have been one of the fasted cars at the Pod last time but i got my ass handed to me by a Nova. Its just a big chunk of V8 muscle. Thats it.
Gorgeous looking and sounding but not really that quick compared to a lot of other things. Would'nt change it for the world though

With the right conditions and right technique a stock CV8 should do a 14.2-3 sec 1/4.

It was a hot day? Are you gonna be there on the 16th as i feel i'm getting a bit of lag changing from 1st to 2nd. Would like someone that knows what they are doing to take it down the quater. If i can rule out any probs i'll know its just my cack driving

Sadly i wont be there on the 16th. CV8's are very high geared and getting a good lauch is tricky. What was your 60ft time? 2.5secs, more? Best ive done is 1.9 secs.(in a monaro) It IS doable, just not easy. You will make your gains here from technique.

[ringram]

Drop your tyres down to 20psi or there abouts too.. Not sure on the ideal, but I went from 2.4 IIRC to 2.1 over the 60.
60ft like Roger says is a good gauge of how well your launch went. Your trap would suggest you had some issues though... unless you shift like Aunt Daisy.
Wind the RPM out to a couple of hundred rpm under redline too..

I will come on the 16th if I can, depends on bloody work. I still need to beat mysty

Edited by ringram on Sunday 3rd August 23:15

[crisisjez]

Guy`s these are muscle car`s and will never be quick over the 1/4 without deliberate modification to do so.
They`re just a truely awesome allrounder and a family friend IMO.
Don`t forget that Soph did a 15.2 in an Astra VXR which is a really really quick car so try not to compare our times to the cars prepped for the strip.
AJ just guessing on the 100hp but that speed is about what you`d expect from a std car.
Remember all..... Speed= power
Time = Traction (mainly)

So with the `ro` forget the times and look at the speed.
Bet your`s was higher or near the same as the Nova you said creamed you Bonnie.
On the 16th take some time out to sit and watch some other cars run, it`ll change your mind about the `ro` being slow, it did me.

[crisisjez]

Bonnie and Clyde said:

Jez whats the difference between VXR500 and yours. Hav'nt they both got Harrop SC's. Does the intercooler make a big difference?

VXR500`s are non intercooled H112 supercharger setups, I`m running an intercooled H122 at double the charge pressure.
When intake temps get hot (which they do as the supercharger compresses the air) the engine computer say `hey ho this is bad thats too hot and may damage the engine` and delays igniting the mixture untill the piston has travelled further away from the optimum flame point. This in effect reduces the efficiency of the engine but ensures no damage due to a premature explosion (called detonation) which in the most extreme of cases can occur as the piston is still travelling up toward the head rather that just as it begins its journey down. If this happes you generally blow naffing great holes in the top of the piston which is a bad thing.
Intercoolers generally help to reduce intake air temperature and allow the engine to release more of its available power.
Sitting in line waiting for a run at the Pod is probably the most demanding test you can give any FI car and its no surprise that AJ`s car pulled timing (to prevent detonation).

Roger and I have been looking at a method of reducing that effect and if the car`s ready should be interesting to see if it works. (No its not cooling mist or NOS)

If not I`ll bring Mental Betty (if SHE`S ready )
She`ll make you all look quick believe me.

Edited by crisisjez on Sunday 3rd August 23:44

[Mystvxr]

ringram said:

I will come on the 16th if I can, depends on bloody work. I still need to beat mysty

Hope you can make it mate and I wish you the best of luck. Weather permitting I want to be getting well into the 12's, I expect to be made to wear a crash hat this time and if I have to I'll run 20 psi on the rears!

[ringram]

crisisjez said:

VXR500`s are non intercooled H112 supercharger setups, I`m running an intercooled H122 at double the charge pressure.
When intake temps get hot (which they do as the supercharger compresses the air) the engine computer say `hey ho this is bad thats too hot and may damage the engine` and delays igniting the mixture untill the piston has travelled further away from the optimum flame point.

Hot = more volitile = requires less timing.

While it may not actually be past optimal, the lower mass of charge (PV=nRT) wont help either. In theory you can tune the engine to maintain optimal timing by using the IAT spark modifier which is the main cuprit in this instance. Well also the intake charge blending table.

The ECU tables are there to maintain optimal performance under differing conditions. So the action of reducing spark advance is not bad, its actually good as long as its tuned right. What is bad is the hot intake temp... Thats what you need to reduce.

Greg Banish an OEM calibrator says ECT is about 200F/93C for emissions reasons, 180F/82C is more optimal for performance. Lowering ECT is a good idea, making the fans come on harder and earlier can pull ECT down to the high 80*C range, but a lower temp thermostat will get it to 80*C This will give you a denser charge and allow more timing, all nice stuff.

Understanding how the ECU works (and therefore the engine) will help you understand how to get and maintain optimal power with your setup.

To further my education on this topic Im off to this later this year http://www.aetconline.com/speakers/Default.asp

[Bonnie and Clyde]

You guys are brilliant. Its gonna take me years to understand this stuff but i'm determined to do it. It really is the only thing i'm fascinated in. So lower tyre pressure and keep trying. I would really like one of you to do the quater in ours just to see if you can "feel" what i mean. Its hard to explain.

[Stigmundfreud]

I'll do it