Jump to content
SAU Community

Recommended Posts

sounds like same ratios as me.. cept the redline.. 4000rpm @ 160km/h sounds about right.

and i was edging on 7000rpm when i tested it.. was still pullin reasonably well... dont think it wouldve reached 300... maybe 290...

i woulda been doing about 274. ive estimated that our ratios given a higher redline is capable of well over 300km/h

  • Replies 46
  • Created
  • Last Reply

Top Posters In This Topic

sounds like same ratios as me.. cept the redline.. 4000rpm @ 160km/h sounds about right.

and i was edging on 7000rpm when i tested it.. was still pullin reasonably well... dont think it wouldve reached 300... maybe 290...

i woulda been doing about 274. ive estimated that our ratios given a higher redline is capable of well over 300km/h

phwoar! so now i can brag to my mates haha.

i want a gtr :D

what are you basing this on? in 5th gear, if the engine is doing 4000rpm at 160kmh, all logic would indicate that at 7000rpm the car will be doing 280kmh. and if you go into the redline, maybe 300kmh (power permitting).

is my speedo or tacho out of whack? im pretty sure in 5th the speeds are approx:

1000rpm - 40kmh

2000rpm - 80kmh

3000rpm - 120kmh

4000rpm - 160kmh

therefore, since its a directly proportional relationship:

5000rpm - 200kmh

6000rpm - 240kmh

7000rpm - 280kmh

im pretty sure my reasoning is correct. and the only thing preventing 280kmh is friction and drag.

hsc physics ftw!

I've got a NA R33 GTS, so the ratios are slightly different... At 100km/h in 5th I'm sitting on 3000RPM. So that means it's RPM/30=KMPH.. so 7000/30=233KMPH

haha what is a squid topic?

Squid = no clue, no idea, I have a fast car/bike therefore I am soooo good!, I bought a fast car/bike so people will love me! LOL :D

Squid name came from the UK referring to bikers/hoons in bikes/ :D cars who think their lack of skill is made up for with a fast machine.

what are you basing this on? in 5th gear, if the engine is doing 4000rpm at 160kmh, all logic would indicate that at 7000rpm the car will be doing 280kmh. and if you go into the redline, maybe 300kmh (power permitting).

is my speedo or tacho out of whack? im pretty sure in 5th the speeds are approx:

1000rpm - 40kmh

2000rpm - 80kmh

3000rpm - 120kmh

4000rpm - 160kmh

therefore, since its a directly proportional relationship:

5000rpm - 200kmh

6000rpm - 240kmh

7000rpm - 280kmh

im pretty sure my reasoning is correct. and the only thing preventing 280kmh is friction and drag.

hsc physics ftw!

as metioned earlier i was doing 180 at 5000 when speed limiter kicked in, unless you have changed the gearbox and/or diff in your car you shouldnt be doing more then 180 at 5000

perhaps the previous own converted the car from auto to manual and left the auto diff in it, that would explain the higher speeds

i am curently in the middle of converting mine to manual with the auto diff, i will be able to check these speeds with this set up when is finished at the end of the week

unless someone who has tried this can support this idea? :)

and sucks to have a n/a box :yes:

It does... although any higher diff ratios would really leave me struggling to accelerate. If anything I'd like a lower ratio again (i.e. higher revving) but with another gear :)) 3000RPM at 100 on the freeway does get a little tedious!

as metioned earlier i was doing 180 at 5000 when speed limiter kicked in, unless you have changed the gearbox and/or diff in your car you shouldnt be doing more then 180 at 5000

perhaps the previous own converted the car from auto to manual and left the auto diff in it, that would explain the higher speeds

thats a very interesting theory. a bit far fetched perhaps, i see no reason why my car would be an auto convert! are there any cosmetic giveaways?

im very interested to hear your results.

Last count with a bit more then 217rwKw i managed 265 and it would not go ANY more, basicaly hit a brick wall, mind you 0-210 kph takes SFA in teh first 4 gears, plug in 5th and it takes hours to do any more.

thats quite impressive. im going for a final tune soon, but we reckon its already got 240rwkw.

wouldnt be surprised, because mine charges through 5th too...

cant imagine what it must be like to have 350rwkw, 200-300 in 5sec ftw!

So lets say your car has the potential to hit 300kmh....Where exactly do you plan on using this kind of speed ?....

past "speeding. no one thinks big of you." billboards. surely people will think big of doing 3 times the legal limit? i couldnt do that with a small doodle.

or perhaps i will take my plates off and go for a run around sydney to make a current affair.

the point of the discussion was so that i dont have to do it. we all know curiosity killed the cat. and we all know that if it wasnt illegal, we would all do top speed runs at 3am.

this way, i can tell commodore drivers i have a 280+kmh car, without having to risk life or licence.

Edited by gt-ahhh!

Well I have to admit I dont really know too much about the workings of Dynos...However wouldnt a Dyno be able to measure something like this ? I know one of my Commodores years ago made 170 at the wheels at 195 kmh....So maybe the dyno could give you the reading...I dont know....Ask a dyno operator

Well I have to admit I dont really know too much about the workings of Dynos...However wouldnt a Dyno be able to measure something like this ? I know one of my Commodores years ago made 170 at the wheels at 195 kmh....So maybe the dyno could give you the reading...I dont know....Ask a dyno operator

thats a very good point, but a dyno cant replicate friction and wind resistance. it would calculate the speed based on revs, same as what i have done.

With stock gear and diff ratios and on 17 inch wheels.

I was bouncing off the rev limit at 7000rpm in 5th and PFC recorded 254kmh.

THANKYOU! finally some evidence haha

well thats brilliant. although slightly disappointing. either my speedo/tacho are out or i have different diff or something.

I think a lot of people who have done 200km/h need to actually go to the track and wind out 5th gear. With 260rwkws my car loves 4th gear. It pulls nicely. From 180 to 220km/h it pulls nicely, but after about 230km/h ? Well the going gets very hard.

It is all about hp at those sorts of speeds as Skylines with their farked up front bars with big opening and intercoolers, combined with their c-pillar screens are not very aerodynamic at all. Back in the Grp A days the Sierra and even the VN Commodore were both more aerodynamic :)

So you need power to push the car through the air when you have grabbed that tall 5th gear. A 350awkw R33 GTR will do 310km/h (Avalon airport and radar gun). Perhaps it could go a bit quicker with more runway....but for isntance at Phillip Island i come onto the straight at 180km/h and only pull 240km/h down the straight. Which is slightly down hill and has a quick turn 1 at around 170km/h. Now compare this to Sandown where you come onto the straight at about 70km/h and the back straight is up hill with a slow 60km/g corner off the back straight....so all that said i still hit 234km/h. So on paper i should be going way quicker down the straight at Phillip Island as i come on to the farking thing 120km/h quicker, is down hill, and longer, and i brake later...yet i go less then 10km/h quicker.

So you can see that once you hit a certain speed you almost crawl up the speedo and have to really fight for 10km/h . So you need plenty of power to be doing 270km/h

I think a lot of people who have done 200km/h need to actually go to the track and wind out 5th gear. With 260rwkws my car loves 4th gear. It pulls nicely. From 180 to 220km/h it pulls nicely, but after about 230km/h ? Well the going gets very hard.

It is all about hp at those sorts of speeds as Skylines with their farked up front bars with big opening and intercoolers, combined with their c-pillar screens are not very aerodynamic at all. Back in the Grp A days the Sierra and even the VN Commodore were both more aerodynamic :ninja:

So you need power to push the car through the air when you have grabbed that tall 5th gear. A 350awkw R33 GTR will do 310km/h (Avalon airport and radar gun). Perhaps it could go a bit quicker with more runway....but for isntance at Phillip Island i come onto the straight at 180km/h and only pull 240km/h down the straight. Which is slightly down hill and has a quick turn 1 at around 170km/h. Now compare this to Sandown where you come onto the straight at about 70km/h and the back straight is up hill with a slow 60km/g corner off the back straight....so all that said i still hit 234km/h. So on paper i should be going way quicker down the straight at Phillip Island as i come on to the farking thing 120km/h quicker, is down hill, and longer, and i brake later...yet i go less then 10km/h quicker.

So you can see that once you hit a certain speed you almost crawl up the speedo and have to really fight for 10km/h . So you need plenty of power to be doing 270km/h

I cant speak for Sierras but i can for VN commodores..There is no way they have any sort of Aero advantage over skylines..if ever there was a brick wall of a car this is it. My last done up VN which made 170 kw at the wheels was a prime example. I once compared it to a mates boosted SR20 180 SX...to ride in both my car would have mauled him 0-80km....80-120 it would have been dead even..but 120 + see ya later 180 SX would be dissapearing into the distance...Even comparing my last Skyline , my R32 GTS4....Not as fast as the VN I had...0-100 it would have been eaten alive by the commodore...but 100+ would have been even up to 130 but after that the Skyline will pull away...Even other Commodores I have been in over the years are the same...they just run into that brick wall at 140kmh...maybe the newer ones have improved Aerodynamics

I cant speak for Sierras but i can for VN commodores..There is no way they have any sort of Aero advantage over skylines..if ever there was a brick wall of a car this is it. My last done up VN which made 170 kw at the wheels was a prime example. I once compared it to a mates boosted SR20 180 SX...to ride in both my car would have mauled him 0-80km....80-120 it would have been dead even..but 120 + see ya later 180 SX would be dissapearing into the distance...Even comparing my last Skyline , my R32 GTS4....Not as fast as the VN I had...0-100 it would have been eaten alive by the commodore...but 100+ would have been even up to 130 but after that the Skyline will pull away...Even other Commodores I have been in over the years are the same...they just run into that brick wall at 140kmh...maybe the newer ones have improved Aerodynamics

Maybe your VN with 170kws... but its a fact that the VN Grp A had less drag then the R32 GTR. It was well publicised in the racing world in the era of Group A racing. What that means with downforce etc etc who knows, but the coefficient of drag was lower for the Holden VN SS Group A then it was for the R32 GTR. The Cd for the R32 was something like 0.40, where the VN was 0.34...and the new R35 i read is somehting like 0.27

I can't wait to get on a strip and see where mine tops out.. twincam 30, 25box, 3.9 diff ratio, it powers through 5th without breaking a sweat! I don't see it being that much different with the taller diff, I'm doing ~2900rpm in 5th @ 100kmh.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • Back again. I returned to Japan in Jul/Aug to spend time with the car on my birthday and remind myself what all the sacrifice and compromise is for. It happened to line up with the monthly morning meet in Okutama, which I have been wanting to go to for a long time. It's a unique event at a unique spot with really rare, interesting, and quirky cars. It's where all the oldheads and OGs gather. The nighttime scene at DKF certainly has its place and should be experienced if you're into cars, but there's too much bad attention and negativity around it now. IMO the better time is Sunday morning at DKF or Okutama; it's more chill and relaxed. I'm glad I was finally able to go, but not sure it's worth the drive from all the way from Nagoya immediately the day before, unless I was already staying in Tokyo for the days right before the meet, because you have to wake up quite early to make it in time. Funnily enough though I didn't drive the car all that much this trip because it was just too damn hot. While there were zero issues and running temps were nominal and the A/C was strong, RBs already run crazy hot as it is. Sure, it took it all like a champ but something about driving these cars in the ridiculous heat/humidity bothers me and makes me feel like I'm asking too much of it. I'm just me being weird and treating the car like a living thing with feelings; I'm mechanically sympathetic to a fault. Instead I was mainly driving something else around - a KX4(silver) 2001 X-Trail GT, that I acquired in May. There's a few different flavors to choose from with Xs, but visually it's the Nissan version of the Honda CR-V. Mechanically it's a whole different story as this, being the top-trim GT, has an SR20VET mated to a four-speed auto and full-time AWD! It was a very affordable buy in exceptional condition inside and out, with very low mileage...only 48k kms. Most likely it was owned by an older person who kept it garaged and well-maintained, so I'm really happy with how it all worked out. It literally needs zero attention at the moment, albeit except for some minor visual touch-ups. I wanted something quirky, interesting, and practical and for sure it handily delivers on all three of those aspects. I was immediately able to utilize the cargo and passenger capacity to its full extent. It's a lot of fun to drive and is quite punchy through 1st and 2nd. It's very unassuming -in the twisty bits it's a lot more composed than one would think at a glance- and it'll be even better once I get better tires on it(yes, it's an SUV but still a little boat-y for my liking). So...now I have two golden-era Nissans in silver. One sports car and one that does everything else; the perfect two-car solution I think👍 The rest of the trip...I was able to turn my stressed brain off and enjoy it, although I didn't quite get to do as much as I thought. I did some interesting things, met some interesting people, and happened into some interesting situations however, that's all for another post though only if people really want to know. Project-wise, I went back to Mine's again to discuss more plans and am hoping to wrap that up real soon; keep watching this space if that interests you. Additionally, while working in the tormenting sweatbox that is the warehouse, I was able to organize most of the myriad of parts that my friend is storing for me along with the cars, and the 34 has a nice little spot carved out for it: And since it can get so stupid hot in there, that made it all the more easy -after I was standing there looking at the car and said 'f**k it'- to finally remove all the damn gauges that have mostly been an eyesore all this time. Huzzah. The heat basically makes the adhesive backing on the gauge mounts more pliable to work with, so it was far less stressful getting this done. I didn't fully clean it up or chase the wiring though; that will happen once I have the car in closer possession. Another major reason to remove all that stuff is to give people less reasons to get in my car and steal s**t while it's being exported/imported when/if the time comes, which leads us to my next point... ...and that is even though it's time in Japan is technically almost up since it's a November car and the X would be coming in March, I'm still not entirely sure where my life and career is headed; I don't really know what the future looks like and where I'm going to end up. I feel there's a great deal of uncertainty with me and as a result of that, it feels like I'm at a crossroads moreso now than any point in my life thus far and there are some choices I need to make. Yes, I've had some years to consider things and prepare myself, however too much has happened in that time to maintain confidence and everything feels so up in the air; tenuous one might say. Simply put, there's just too much nonsense going on right now from multiple vectors. Admittedly, I'm struggling to stay in the game and keep my eyes on the prize. So much so in fact, that very recently I came the closest I ever have before to calling it quits outright; selling everything and moving on and not looking back. The astute among you will pick up on key subtext within this paragraph. In the meantime I've still managed to slowly acquire some final bits for the car, but it feels nice knowing there's not much left to get and I'm almost across that finish line; I have almost everything I'll ever want for my interpretation and expression on what it is I think an R34 should be. 'til later.
    • Thanks for that, hadn’t used my brain enough to think about that. 
    • Also playing with fire if they start to flow more air down low than what the stock twins can. It's not even up top you need to worry, it can be at 3000rpm and part throttle and it's getting way more flow than it should.
    • Any G40/1000 or G40/1250 results out there?  
    • You still want a proper tune on the stock ECU though. Stock tune + stock ECU with GT-SS/-9s is probably playing with fire if you're running more than stock airflow/power.
×
×
  • Create New...