mark kibort

overboost?? the GTO is the vet powered LS6 engine. ( think) thats why its rated at 400hp, but 3880lbs!!

0-60 in 4.5 or so.

mk

blau928

Hi MK et al...

My number cruncher gave me the same idea of 210 with an S4 Auto... Now, I guess I really have a reason to install my 210mph Speedo instead of letting it sit in the box..

The 3rd gear in the auto and the 4th gear in the 5spd of 928 I believe are 1:1 (direct drive...)

So, I'm guessing that if that OD can be fitted, and the motor can get to 6300rpm and stay cool, then a 400 Km/H should be attainable with say oh.... 800hp, full undertray and a really tight suspension... not to mention a crazy driver....!

On the other hand, if the car could pull to 6500 without an extra OD, then 210 becomes attainable without running oversize tires lke the white car.. Suspension will still need to be set up, along with a full undertray and not too wide front tires..

Sounds achieveable.... If a driver can be found to do this in a street car... I know that the 9ff team went 233mph on street VMax Conti's in 19 inch Porsche Spec.... and a bit of suspension tweaking at Nardo...

Maybe it can be repeated or bettered by a 928 at Bonneville with a stroked & blown engine...? Thoughts..?

Now those Subies are pretty quick to 125, as are the Lancers... Once the 928's get over the 125 though, they just fall away... Now to boost the thing, and have them fall away period....

Nick... That Benter is some piece of work... Got a bit o' grunt eh old chap..? Well, a 928 could be similarly equipped to perform with a gentle massaging of the intake tract with a bit of ... ahem.. extra compressed air... eh..?

Cheers,

mark kibort

Actually, the 928 manual is 1:1 when in 5th gear. (ie 2.2:1 is the total ratio in 5th gear. with a 25" diameter tire, thats 78.53" circumference.
SO, that is 478mph at 6400rpm wth no reduction. Now, just plug in your ratios and have fun.

4th on an S4 is 3.2:1 (for example) that works out to 150mph with a 2.2:1.

If the tire is 25.7" as the 335 and 315 are, then 80.73" circ. becomes 492mph
in 4th , that would be 153mph

Now, its 223mph if you could reach it in 5th gear with a 2.2:1 rear end.

Interesting enough, a 2.2 rear end set up would be perfect for andersons car at road america, probably better than he has now, as he could get to 166mph in 4th at 7,000rpm. however, at laguna where top speeds are never higher than 140mph, the GTS box is better as he can peg it in 4th.

tire sizes are only a 2-3% factor and really shouldnt be considered as a factor in reaching top speeds or faster accel times. far too many other variables to consider.

bottomline, all of the cars we speak of will "fall away" after max torque in any gear. so, it really becomes a factor of the cars hp and how close the gears can keep the max hp to the wheels.

mk

blau928

Lessons learned from the experts...!! Thanks ..!!

Kevin Michael

m.k. i thought the gto was a v-r sc'd at 300hp? chaad, i have done exactly that a time or two. it is tremendous fun to roll 3rd at 45 mph next to a muscle car, then slip into second wot. it is worth the expressions on their faces!

heinrich

Mark, it was definitely an overboost sound, and nothing else. You are quite right, the GTO is not boosted (I looked at their site) but Ah knows what ah heared ....

heinrich

http://www.superchargersonline.com/p...=V4GJ218-018SQ

"The Vortech supercharger system for the 5.7L GTO is available."

However, if that had been what I was up against I think I might not have had a chance. Either way .... had that very clear air-popping sound of a blowoff valve working overtime. And zero growl or V8 sound.

FlyingDog

Are you sure it was a GTO and not the supercharged 3800 in a Grand Prix?

heinrich

Definitely saw G T O cast into the rear bumper.

Kaz

I've tangled with quite a few cars in both my 928 and Audi S4. On Thanksgiving day I had some kid in a new Nissan 350Z try me while I was in the Audi. Didn't even realize I was about to be raced until a puff cleared from his pipes and he took off. The Audi worked hard but I could eventually crawl by him in 6th gear with my foot to the floor but I had nothing left. Had he been modified I'd have been through. A month later, I tangled with another 350Z but this time in the 928, it wasn't even close and the 928 didn't have to work hard. Thinking something might be wrong I lifted to let him pass, and get two car lengths. Once I dropped the hammer again I went by him like he was standing still. In the 928 at 80mph I spin just shy of 3000rpm or thereabouts in 4th gear. In the Audi I'm around 3200-3300rpm in 6th, which bothers me if I'm paying attention. I often wish for a 7th gear.

Over 2 years ago before I sold the blue 1988 928S4, I took it on one last run to Vegas. I drove it hard figuring that in the desert heat I'll break anything that was wanting to break before turning it over to its new owner. On the way just outside of Riverside I ran into a 99-2001 model 996. We wearily kept each other in sight until the road cleared and then we went at it from about 90mph or so. Over 130mph I pulled by him each and every time with front and rear AC units on. He kept wanting to go just to make sure. It seemed the higher speed we took off from the more advantage I had. He was surprised, I was pleasantly surprised. Once though, we got slowed by some RV's along the way and he was able to trounce me. Leaving from 50mph or so with only an auto transmission is not the way to go against a 6spd 996. In anycase it was the fastest trip I ever took to Vegas.

heinrich

Kaz, that sounds like my kind of fun

T_MaX

KAZ,

Mark K, I can get 160+ (almost 170) MPH ind. in 4th with mine (stock chips and GTS spec tires).

FWIW, I had a freind of mine check my ind. with a calibrated radar, I was only +1 or so off @ 30-70MPH.

Gretch

I suspect your experience with the 350z was impacted by reluctance on the part of the Z's driver......Those cars are very fast, and they have top end too....... I would be happy to go against one in my Supershark, but I would expect to get my *** kicked if I tried it in my C4........

mark kibort

Like i said, its got to be an auto to do this.

when we are talking gears, we have to talk apples ot apples. auto gears are so much different than the manual, its hard to compare.

in a nutshell, 4th in an auto is close to 5th in a manual. you aint getting 170 in 4th in a manual, unless you are twisting the engine up to 7040rpm. (and are running 315 tires.) If you are running stockish tires (ie 25"diameter) better twist it up to 7250rpm to get 170 in 4th gear manual!!!


mk

mark kibort

This is clearly an example of racing in the wrong gears. if you ever are going to race someone in your 928 (or someone is going to race you in thier car , ah huh, AKA a 996) then you got to be in lowest gear possible to start. if it means starting out at 5000rpm, then do it. if you start out at 3000rpm, you are in a gear too tall and you are leaving over 25-50% of your torque/hp on the table. this is usually the difference in most street races. ANY car with simular HP to weight, in a straight line, will be almost dead even in a race if both drivers know what they are doing. the specs for most of these cars are within .25-.5seconds of each other for 0-60, 60-100, 30-60, etc etc.

Im sure , as ive driven with a lot of students in 996s, that the 996 was in the wrong gear. there is 6 to choose from and a 7k plus redline. most have no clue how to race their 996s. If they did, you would see a 2900lb 996 with a stock 290-300hp keep right up with ANY stock S4 or even GTS at weights of 3500 to 3600lb. Heck, i remember driving a students S2000 that red lined at 8000rpm. i was never in the right gear. felt and sounded like i was. Just a little foriegn downshifting when you were already at 5000rpm for max acceleration! Another thing about the 996 vs a S4, is that when you get to the speeds where the 928 has to shift to the 2.2:1 5th gear, the tighter gear ratio'ed 996 will walk on by, as they will have a big advantage in their 5-6th shift area. its close to a 25% advantage at least, and this is like 75hp on a 300hp car. so, next time you want to say you walked all over a car with simular hp to weight, got to blame the lame driver you are running against. (or think you are running against)


Mk