Brian McCoy

This is more of the same, but slightly different in end result. (Just musings from a REALLY bored guy at work )

What are the best ways to make these 951's quicker off the line and more punchy in the 3~5k rpm range? Clutch issues aside, what would be the best way to make the '44 better at something like a drag strip (I'm not going to do that, it's just got more emphasis on getting up to speed than maintaining an already high rate of speed). Larger turbo wouldn't do it..... Anderson once mentioned a 3.0l engine w/ turbo of some sort - is that the best approach? Maybe just reducing the final drive would help a ton (I don't need a car that can do 150+)... I'm mostly just curious as I'm likely never going to mod this car for more power.

Though, if there are little things (under $500 a pop) that can be done, I might be sucked in..

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Turby

A 3.0 with a supercharger would do the trick! Sell the 951, get a S2 for around the same price, and supercharge it! Now nothing could ever come close to my friends supercharged firehawk......the off the line on that thing is rediculas.

PorscheG96

[quote]Originally posted by Turby:
<strong>A 3.0 with a supercharger would do the trick! Sell the 951, get a S2 for around the same price, and supercharge it! Now nothing could ever come close to my friends supercharged firehawk......the off the line on that thing is rediculas.</strong><hr></blockquote>
That's about 25% of the formula...even with a turbo I can't launch the car correctly because I'm getting boost so soon and spinning the tires [and I don't even have THAT much torque]. You'd have to completely tear apart the rear end and put a different suspension back there, tub the car, put some huge fvcking wheels/tires on, different tranny, new differential, new torque tube, new clutch...and then you could get one of those air/water intercoolers and put ice water in it for a 1/4 pass.

jimbo1111

Install nos to get rid of the lag, throw some slicks on and don't race to far from the tranny shop.o and make sure paragon has plenty of axle cores in stock.lol merry christmas

Steve Lavigne

A two stage rev limiter so you can get full boost off the line by opening the throttle completely and a little low speed programmable traction control (control % slip with ignition/fuel cut) could do wonders to off the line performance. Of course, it wouldn't be too stealthy on the street, what with revving your car to 4000+ rpm against the rpm limiter and having your turbo completely spooled all while stopped.

And, as Jimbo said, make sure you have a spare transmission and axle available. Stay with the stock axles because they are much easier to replace than a transmission or a clutch.

guardsred951S

I remeber Danno saying somethigng about a flexible drive shaft that would act like an elastic band so when you dumped the clutch at 4500 rpm with big honkin' slicks, the drive shaft would take the punishment and catapault you off the line. Dunno if there is such a thing or even if it's worth it, but it may not be a bad idea.

Aside from drivetrain weaknesses, I think it's better to make one hell of a powerful engine and not worry about getting off the line quick because whatever your were racing against
(clock, other car etc.) won't be able to keep up once that turbo spools up. We know the 951 will do sub 12's even with "terrible" launches. I say sub 12's because that's what rage2's car would do at see level - probably less. Of course, when it comes to that street stuff, there's no real way to make 'em as quick as many of the american muscle beast we all know too well.

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jimbo1111

[quote] I remeber Danno saying somethigng about a flexible drive shaft that would act like an elastic band so when you dumped the clutch at 4500 rpm with big honkin' slicks, the drive shaft would take the punishment and catapault you off the line. Dunno if there is such a thing or even if it's worth it, but it may not be a bad idea. <hr></blockquote>

i don't thing that will work because most of the stress is after the drive shaft. if you have ever seen a 951 drive shaft you will agree.

Steve Lavigne

[quote]Originally posted by guardsred951S:
<strong>I remeber Danno saying somethigng about a flexible drive shaft that would act like an elastic band so when you dumped the clutch at 4500 rpm with big honkin' slicks, the drive shaft would take the punishment and catapault you off the line. Dunno if there is such a thing or even if it's worth it, but it may not be a bad idea.</strong><hr></blockquote>

I found this thing on my new favorite site:




According to that site:
[quote]What is a guibo you ask; well I'm glad you asked. (By the way it's pronounced Weebo.) The guibo is what you see above. It's made our of rubber and goes sort of in the middle of the axel and absorbs a good amount of the shock from the tremendous horsepower of the car.<hr></blockquote>

I suppose this must attach to the transmission output shafts (one on each side) and to the inner cv joints with a shorter axle.

The site is <a href="http://www.gunnarracing.com/" target="_blank">http://www.gunnarracing.com/</a>, be sure to check out their projects section. Also, check out <a href="http://www.962.com" target="_blank">http://www.962.com</a>.

rcldesign

The revlimiter is the ticket... check out Link Electro Systems LEM2 - it has "no lift shift" and "launch control".

Here are some links to information:

<a href="http://www.archcartpro.com/users/dkhajavi/HR-EFI.html" target="_blank">HR EFI (Link LEM1 and LEM2) for 944/951/etc</a>


<a href="http://www.link-electro.co.nz/lem.html" target="_blank">Link Electrosystems - LEM (you can also check out the LEMPlus)</a>

GaryK

How about shorter gearing (like the S2 final drive) for better off-the-line acceleration?

That guibo is similar to the driveshaft carriers used on BMW, Audi, Merc ..

Brian McCoy

LOL, this got a little to far into the drag ref (and away from the street desires).

So, maybe a little refocus... I'd like a LITTLE more off the line 'umphf' (it'd be nice if the tires would at least chirp - maybe I'm taking it to easy), with neck snapping acceleration from 2,800pm in 5th (typically about 80mph). My GF's Ford Exploder provides more excitement when flooring it than the P-car (as sad as that may be).

I think maybe an S2/968 w/ supercharger might have to be the route I go though. Or maybe I should just jump over to the 928 GTS.. Of course, I DO live in America so any classic muscle car would be easy to pull off and provide the giddy-up I'm looking for (at the loss of going around a corner with any semblance of grace).

I think I'm just confused... anyone want to trade me a Geo Metro?

Jim Nowak

Here is the quickest Porsche I know of: <a href="http://www.texaskingofthehill.net/Photos/Danny_Humphreys/danny_humphreys.html" target="_blank">http://www.texaskingofthehill.net/Photos/Danny_Humphreys/danny_humphreys.html</a>
Well, I guess you could still call it a Porsche? There is no replacement for displacement! Something like an 8 second 1/4 mile.

guardsred951S

[quote]Originally posted by jimbo1111:
i don't thing that will work because most of the stress is after the drive shaft. if you have ever seen a 951 drive shaft you will agree.<hr></blockquote>

I think the whole idea would be to reduce the sudden shock effect on the various drivetrain parts so they would suddenly fail. I don't think it's so much the actual parts that are at fault, but the sudden shock they must abosrb when the tires stick and the engine is send all that torque and HP through them. Also, it doesn't necessarily have to be the driveshaft, but any part between the engine and wheels that could be modified/replaced to absorb the shock.


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TonyG

Sounds like you have some basic maintenance to do on your car.

If your GF's Explorer is providing better acceleration at 80mph in 5th., then you've got some other issues to attend to.

There's no way that a 951 in good shape, stock, won't by far out accelerate a Explorer w/o having to downshift. Impossible.


Get your car tuned and running/boosting properly first. Then worry about making more power.

special tool

hey Steve - that guibo is funny. Bmw recommends every 30,000 miles to change. They let you know by creaking, but I think they are a good idea. Interetingly, they didn't put them on automatics.