View Full Version : Limits for ET Turbo????? 200kph in 3rd?
Ok, just wanting a bit of clarification. Someone i know recently got an et turbo with the usual mods including jap spec engine, t25/28, exhaust, microtech and with a bit of boost, and i was told by this person that they reached 200 in 3rd gear. Now i find this hard to believe, though instead of telling the guy what i thought, i deceided to ask everyone here first. Is it possible? For those of you who have et's what do u think?
I have an ET, with an N13 gear box.
It will do 200km/h in 4th.
Most ET's (eg. with N12 gear boxes) wont reach 200km/h in 4th, let alone 3rd. (Not to say they wont make 200km/h, they just wont do it with that gearing :))
Sockz: Im not saying it wouldnt be possible if it had massive work, though considering it is a mildly worked car! When he first told me i shook my head at him and he asked what was wrong, i told him that i didnt believe that car, aswell as the majority of factory cars out there doing 200 in 3rd. What i rekon happend was that he was in 5th and thought it was 3rd? Likely story? I wouldnt know!
Maybe that what the speedo says, what it is actually doing is a different story. Different diff ratio, wheels & tyres the speedo could be out.
What i basically meant was, it would be well beyond redline at 200km/h in third, No matter how 'worked' it may or may not be.
Another likely story might that he's a bit of a BS artist ;)
Sockz, interested in what you did to fit the n13 box, spill the beans please.
200 is easily possible with those mods, just not in 3rd. I think ya probably right about the 5th gear mistake.....
i read in another thread ages back from jon_200sx that these things can rev out to 9500 with the right work, thats why i was thinking it could be possible!
Ur spot on about the B.S part Sockz
An R32 with 4.3:1 diff and 205/55-16 (ie similar diff and bigger wheels to an ET) will hit the rev limiter at about 180 in 4th. That's 7500rpm. Rev limiter in 3rd is down about 140km/h.
So the chances of an ET having enough revs to make an extra 60km/h in 3rd with overall similar gearing is pretty shit poor.
(Note, I know there is a 180km/h speed limiter on the R32. And yes it does red line just before that in 4th. Will only hit the speed limiter in 5th...so don't hassle me about it.)
cheers
About the box, it was fitted by the previous owner.
The engine itself with some cam work can rev quite high- theres at least one benefit of having no displacement :p
GTSboy: you seem to know ur stuff, so taking into account an et's diff ratio etc, what revs would the car have to produce to hit 200 in 3rd?
hotgemini
25-09-03, 05:35 PM
What diff ratio, tyre size and third gear ratio would an ET have?
Well an ET will hit 6000rpm by about 120 So if it could rev to about 10000 it'd probably do 200
They come with 13" wheels stock don't they? So even if it had a fairly big upgrade you would be pushing it to have anything bigger than a 16" wheel under there....and then it would have to have pretty low profile rubber to fit. So I doubt it would get to a bigger rolling diameter than the 205/55-16.
Diff ratio is probably 4.1:1. Even if it is higher, say 3.9:1, to go with small diameter wheels, the overall gearing would still not be taller than the R32.
An R32 would have to rev to about 10700 to make 200km/h in 3rd with all the standard gearing. So if you assume that the ET is geared at least as high then it would also have to do over 10500 rpm to make it. If, as per my other reasoning, you reckon that an ET is not geared as high as an R32, then you will be looking at the high side of 11000rpm to do 200 in 3rd.
Not gunna happen :)
GTSBoy: 14" std I believe 185/whatever they are (I dont' own an ET)
But the gearing 3000rpm is 60 in 3rd... 6000 is 120... What does that make 200???
12000rpm would get you 240 :D
14" 175/65
Dazza owns a pretend ET. :p
Originally posted by dazza
GTSBoy: 14" std I believe 185/whatever they are (I dont' own an ET)
But the gearing 3000rpm is 60 in 3rd... 6000 is 120... What does that make 200???
12000rpm would get you 240 :D
Going by this ... 200km/h would be 10,000rpm.
Originally posted by Sockz
Going by this ... 200km/h would be 10,000rpm.
buzz, buzz, buzz!
Actually, if it only needs 10000 to get to 200 that makes it a little bit taller geared than the R32. So whilst we know that the R32 is geared fairly short.....it's kinda surprising to see a little FWD car geared taller.
cheers
intehnet
28-09-03, 08:20 PM
if he has changed the diff ratio the speedo will be reading out bad results
i drove a VR hsv with 3.7 diff in it today and according to the speedo the trap speed after the 1/4 was 220kmph! when it was more like 160-170
intehnet
28-09-03, 08:37 PM
if he has changed the diff ratio the speedo will be reading out bad results
i drove a VR hsv with 3.7 diff in it today and according to the speedo the trap speed after the 1/4 was 220kmph! when it was more like 160-170
intehnet
28-09-03, 09:18 PM
if he has changed the diff ratio the speedo will be reading out bad results
i drove a VR hsv with 3.7 diff in it today and according to the speedo the trap speed after the 1/4 was 220kmph! when it was more like 160-170
raddavey
28-09-03, 10:17 PM
3rd gear at 3000rpm is actually 70kmph. So 6000 will go 140.
Would require 8550rpm which can be achieved with a high spec cam etc.
raddavey
28-09-03, 10:18 PM
3rd gear at 3000rpm is actually 70kmph. So 6000 will go 140.
Would require 8550rpm which can be achieved with a high spec cam etc.
muttaburra
30-09-03, 03:37 PM
i doubt he would be changing the diff gearing there is not a lot of options around to do this and its a major pain in the arse from what i heard
N14 pulsar does 195km @7700rpm (red line) in forth
so i doubt the ET would be able to acheive 200 in 3rd they will do 200kph but you need 5 gears and not a huge amount of engine work. my old et use to do 200 in 5th with only a exhaust and a bit of boost, and it use to shake like all crazy and float all over the road. 200kph not recommended in a ET
Originally posted by muttaburra
200kph not recommended in a ET
Wonder how fast 7500 in 5th gear is with the pre-1986 3.55:1 diff ratio would be :D:D.... speedo only go's to 200 :D:D
Yeh jon the tacho keeps going up but the speedo gets stuck :(
Datto-Zed
02-10-03, 02:18 AM
Originally posted by GTSBoy
An R32 with 4.3:1 diff and 205/55-16 (ie similar diff and bigger wheels to an ET) will hit the rev limiter at about 180 in 4th. That's 7500rpm. Rev limiter in 3rd is down about 140km/h.
So the chances of an ET having enough revs to make an extra 60km/h in 3rd with overall similar gearing is pretty shit poor.
(Note, I know there is a 180km/h speed limiter on the R32. And yes it does red line just before that in 4th. Will only hit the speed limiter in 5th...so don't hassle me about it.)
Interesting. In RedDrifters R32 which has a standard diff and box AFAIK, we've seen 200kmh just off the rev limiter in fourth. Note we have rewritten the EPROM with no speed limiter, but rev limit was left at 7800 where it was. So what do you suppose is goin on? I'm quite sure the speedo does read acuratly, at normal speeds at least.
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