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F20 - what speed in 2nd?

1K views 38 replies 17 participants last post by  OllyHewitt 
#1 ·
I can tell by doing a search that loads of people have argued about this, but I'd love an answer because I got a nice 0-60 time the other night and I was really hoping that I was actually doing 60!

Speedo stated about 62 just below the rev limiter on a standard Motronic ECU (6,700 ish), with F20 box out of an Astra GTE 16v, and I'd hit that in just under 6 seconds.

195/45 tyres, 15" alloys.
 
#8 ·
Thanks guys, just confirmed it.

With 195/45/R15, standard F20 with the following ratios: (taken from another of your posts Oddball)

1 3.55
2 2.16
3 1.48
4 1.13
5 0.89

FD 3.55

I'd have to be hitting 7,000rpm to get over 60 in second.

It's all academic though really, hitting over 60 in second gear wont make the car any quicker through gears, I absolutely love driving it because of the fat seam of torque it's got from 3000rpm onwards!

It's just something some people are obsessed by when judging a car, so 0-60 will be something mid-6s I guess if I have to shift into 3rd. Still pretty respectable!
 
G
#15 · (Edited)
I don't get this... my speedo reads correctly in the 'testing speeds' gears, ie:

2nd gear, 3k rpm, 30mph
5th gear, 3k rpm, 70mph

But yet i go way over 58mph in second when I hit the limiter...

In 2nd gear... my speeds are as follows:

2k rpm - 20mph
3k rpm - 30mph
4k rpm - 40mph
5k rpm - 50mph
6k rpm - 60mph

My stock limiter of 6800rpm, would say I hit the limiter at 68mph :confused:

This not correct then no?
if not - why are the "testing speed/ gears" correct?
 
G
#16 ·
PS: I shall get a recording of my speedo & rev counter to the limiter in everygear up to 3rd gear soon

My first gear limiter seems to kick in just over 40mph,
second as above seems to be about 68mph,
third is little under 100mph,
fourth limiter is 127mph,
and in fifth it just goes off the clock

:confused::confused::confused:

*all of which was tested out on my grans private air field*
 
#19 ·
OllyHewitt said:
PS: I shall get a recording of my speedo & rev counter to the limiter in everygear up to 3rd gear soon

My first gear limiter seems to kick in just over 40mph,
second as above seems to be about 68mph,
third is little under 100mph,
fourth limiter is 127mph,
and in fifth it just goes off the clock

:confused::confused::confused:

*all of which was tested out on my grans private air field*
speedo is probably just reading bollox.
 
#22 ·
in my box i have a final drive of 3.72(4x4 F20) and i think i can hit 63 in 2nd
GTE has 3.55 and it can't hit 60 in 2nd.
Lowering final drive to 3.72 will mean that you can do 3.55/3.72 * 58 = 55 in 2nd assuming that you have the same limit and tyre size.


Btw, going to a 3.44 (allowing 59.9mph in 2nd) will make the car slower on acceleration.

I went the other way. From 3.55 to 3.9. It's knocked about 0.3s off my 1/4 mile and about 0.2s of the 0-60. That's despite me needing to be in the middle of 3rd before making 60. Lmiter in 2nd is about 53mph for me.
 
#25 ·
1st 56!
2nd 82
3rd 101
4th 121
5th 138

All MPH @7250 rpmlmao
 
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