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Author Topic: Granda MK II 4.0 24v VS Granada MK II 2.0 Turbo  (Read 4495 times)

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Offline Tobbelainnen

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Granda MK II 4.0 24v VS Granada MK II 2.0 Turbo
« on: February 20, 2009, 20:26:26 PM »
I am up for a race this spring, against another granada mk II, this car is powered by a 2.0 pinto turbo, power is some 300hp+ according to the mate of the owner, but it haven't been on the rollers. Now I really don't want to get in second position since that would be loosing. At the moment my car is only onewheel drive, so I need to weld a diff for it so I get some better grip, but what ratio will work best with the 4.0 24v, V6 RWD MT-75 and 245/45/17? I got these to chose from: 4.44:1, 4.11:1, 3.64:1 and 3.45:1. I think I have a 4.11:1 on the car now and I feel that 1th gear is more or less wasted...... And as it is now, I got the rpm limit at 5200rpm, but I though if increasing it to 6200rpm and pull to 6000rpm on 1th and 2nd gear and 5500rpm on 3th and 4th since I don't got any girdle for the mains....

Should the rear suspension be hard or soft for better grip? At the moment I got a set of estate springs on it... But I got some other springs to chose from aswell..... But I am not sure the rear wheel will clear the arc if it gets to low  

Any advice on how to improve the car to ensure victory is most welcomed  


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Pin_cushion

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Granda MK II 4.0 24v VS Granada MK II 2.0 Turbo
« Reply #1 on: February 20, 2009, 20:48:16 PM »
Not like i can answer im just curious...

Race...?

1/8 mile...
1/4 mile...
1/2 mile...
Track...
Street...

...???

Pin_cushion...

Offline Tobbelainnen

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Granda MK II 4.0 24v VS Granada MK II 2.0 Turbo
« Reply #2 on: February 20, 2009, 21:01:48 PM »
Opps sorry, should have mention that. It will be a 1/4 mile......
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Pin_cushion

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Granda MK II 4.0 24v VS Granada MK II 2.0 Turbo
« Reply #3 on: February 20, 2009, 21:09:55 PM »
My basic knowledge says soft at back...
Car squats, weight put on arse, more grip...
Although no doubt im wrong... :-(

Pin_cushion...
« Last Edit: February 20, 2009, 21:12:57 PM by Pin_cushion »

Offline Heiki

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Granda MK II 4.0 24v VS Granada MK II 2.0 Turbo
« Reply #4 on: February 20, 2009, 21:20:04 PM »
You need to lock the rear tires, so welding the diff is one way to go. Soften the rear. Race slicks! If you are ever in the Charlottenberg/Kongsberg area, (I live just west of lake mjosa in Norway) and have the time to drop by I`l give you my old set of BF Goodrich drag radial (225/45/17). I`ll gladly give them away to prove the power of the V6 to the 2.0 guys.. (I keep telling them I got more cubic in my soda pop that what they have in their engines)
They have a couple races left in them. Once you do a burnout they get sticky as hubba bubba bubble gum and you`l be amazed by the grip. 4.11 will do just fine.

Heiki

Offline Tobbelainnen

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Granda MK II 4.0 24v VS Granada MK II 2.0 Turbo
« Reply #5 on: February 20, 2009, 21:40:18 PM »
Heiki, unfortunaly I am up in Sundsvall, so that's quite some trip, otherwise I would have taken you up on the offer. Unless you are willing to ship them to my brother up in Mo i Rana  

I'll have a look around for a set of slicks nearby, maybe there are someting useful poping up......

//Tobbe
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Offline Dave

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Granda MK II 4.0 24v VS Granada MK II 2.0 Turbo
« Reply #6 on: February 21, 2009, 07:44:13 AM »

You need to get the weight transfer to the rear so the car squats at the back but not to much as you will loose traction due to bad camber.

As much weight removed from the car as possible will help alot.

Yeah a welded rear diff is good for sprints.

Drag tyres    ain't that cheating a little.  

Diff wise I would go for the 3.45:1 as it will suit the gearbox & the fat torque curve of your engine better.
You don't have to worry about turbo spool up  

Test runs first as you may find clutch slip is faster than clutch dump but it's something you need to test to know.

Don't forget the video  

& Good Luck Mate.


Dave

Kezza

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Granda MK II 4.0 24v VS Granada MK II 2.0 Turbo
« Reply #7 on: February 21, 2009, 22:42:02 PM »
I wouldnt know
But good luck

Offline Dave

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Granda MK II 4.0 24v VS Granada MK II 2.0 Turbo
« Reply #8 on: February 24, 2009, 00:38:41 AM »
I worked out some rough figures for you.

I guessed your torque curve & a few other figures but this is what the computer says.

Be interesting to see what you get?

Diff       /Quarter    /MPG   /Top Speed

3.45 =  14.44     / 22.92     / 165.3
3.64 =  14.42     / 21.75     / 156.5
4.11 =  14.45     / 19.76     / 138.2
4.44 =  14.49     / 17.81     / 127.6


So as I thought the 3.45 is the best diff in most tests but the 3.64 has a slight advantage in a sprint.

Also tells me clutch dump at 1400rpm is best but that's based on a guessed torque curve


& I can also guess his figures.
I make him 2 tenths slower than you so it will be a very close thing mate.
He will be catching you up towards the end very fast.

One mistake & you have had it. Not to put any pressure on you
« Last Edit: February 24, 2009, 00:57:05 AM by Dave »
Dave

Offline Tobbelainnen

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Granda MK II 4.0 24v VS Granada MK II 2.0 Turbo
« Reply #9 on: February 24, 2009, 10:27:24 AM »
Had a closer look on what diff that is on the car and it is a 3.89... No worries Dave, there isn't any pressure on me.... I will let my brother do the driving, he isn't as heavy as me   Probably save 20kg there....

Welded the 3.45 diff last sunday so that one is ready for the car.  If the roads only were icefree so I can take to car out for a few test runs and set the ignition table propertly....






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Pin_cushion

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Granda MK II 4.0 24v VS Granada MK II 2.0 Turbo
« Reply #10 on: February 24, 2009, 10:56:03 AM »
Dave, how did you get those figures...?

Software?
Website?

Pin_cushion...

Offline Dave

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Granda MK II 4.0 24v VS Granada MK II 2.0 Turbo
« Reply #11 on: February 24, 2009, 14:54:49 PM »

I use lots of different software.

I can do virtual tests on pretty much anything from a drag race, to braking, to suspension etc etc.
Dave

M-man

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Granda MK II 4.0 24v VS Granada MK II 2.0 Turbo
« Reply #12 on: February 24, 2009, 18:16:05 PM »
Have you seen the video were the racingcar crashes and in the slowmotion,  you notice that the driver lost koncentration because a girl showed her tits beside the track.. Thats the way to go.....just need to find a decent looking girl with the right equipment...                    


Pin_cushion

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Granda MK II 4.0 24v VS Granada MK II 2.0 Turbo
« Reply #13 on: February 24, 2009, 19:17:30 PM »
A link is needed...  

Pin_cushion...

M-man

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Granda MK II 4.0 24v VS Granada MK II 2.0 Turbo
« Reply #14 on: February 24, 2009, 19:21:03 PM »
Quote from: Pin_cushion
A link is needed...  

Pin_cushion...

http://www.garaget.org/video/citx0d56t9do]http://www.garaget.org/video/citx0d56t9do

Pin_cushion

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Granda MK II 4.0 24v VS Granada MK II 2.0 Turbo
« Reply #15 on: February 24, 2009, 19:34:06 PM »
 

Not the best tits in the world...  

Knew a guy a while ago that went into the car in front of him at a set of lights cause he was busy perving at a bint...  

Pin_cushion...

Offline Mikey J

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Granda MK II 4.0 24v VS Granada MK II 2.0 Turbo
« Reply #16 on: February 24, 2009, 22:11:35 PM »
Squats not really any good, what you need is anti squat which is an instantaneous event the moment you drop the clutch. This way the rear of the car lifts upwards whilst pressing the tyres into the track.  Opposite forces and all that stuff.   You get a great launch this way and the nose may lift off the floor, lol.   If you can't change the rear links to achieve this then you could fit a pinion snubber into the bodywork so that as the diff nose rises it hits the snubber and tries to lift the car = anti squat   It could be an effing great bolt which you screw downwards just for racing and upwards when you don't need it.

Defo shed the weight, run less fuel, maybe softer rear tyres, octane booster and weight jack the right rear suspension if you don't use a locker.



Offline Tobbelainnen

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Granda MK II 4.0 24v VS Granada MK II 2.0 Turbo
« Reply #17 on: February 25, 2009, 07:40:07 AM »
Quote from: Pin_cushion


Not the best tits in the world...  

Knew a guy a while ago that went into the car in front of him at a set of lights cause he was busy perving at a bint...  

Pin_cushion...

M-man hit the curve ones, while doing the same thing... BUT he had is wifey in the passenger seat, so in his defence he told her: I thought I knew her... That didn't make the situation any better  
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Offline Dave

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Granda MK II 4.0 24v VS Granada MK II 2.0 Turbo
« Reply #18 on: February 25, 2009, 23:53:12 PM »

Mike you have to go & spoil it by talking about a proper drag set-up  

Well yeah of course you are right but them cars only do one thing very well & that's it.

 
Dave

Offline Mikey J

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Granda MK II 4.0 24v VS Granada MK II 2.0 Turbo
« Reply #19 on: February 26, 2009, 01:21:12 AM »
LOL,  you can fit a pinion snubber to any car as it only engages the diff under launch conditions.  The rest of the time it's nowhere near the diff so the car's normal

Offline Cortiworth IV

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Granda MK II 4.0 24v VS Granada MK II 2.0 Turbo
« Reply #20 on: February 26, 2009, 09:52:22 AM »
Quote from: Mikey'J
....then you could fit a pinion snubber into the bodywork so that as the diff nose rises it hits the snubber and tries to lift the car = anti squat

How well does this work in a car with IRS?  The Granada diff is fixed in the chassis, not much movement there.

Svein A

Offline Mikey J

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Granda MK II 4.0 24v VS Granada MK II 2.0 Turbo
« Reply #21 on: February 26, 2009, 10:14:17 AM »
Oh drat, it won't work then.   It'll only take 5 minutes to fit a live axle

Offline Dave

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« Reply #22 on: February 26, 2009, 10:48:18 AM »

5 minutes Yeah right  

If it was a drag car then yeah live axle but it's not  

Get it to squat a bit off the line.

It will probably do it anyway unless you fitted some mega springs
Dave

 

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