WikiWirral Online with you since 2003, fantastic.
Forum Statistics
Forums65
Topics76,352
Posts1,033,281
Members14,560
Most Online16,551
Feb 2nd, 2024
Who's Online Now
7 members (ArranGirl13, 2 invisible), 8,084 guests, and 428 robots.
Key: Admin, Global Mod, Mod
Top Posters
sunnyside 45,164
MattLFC 22,315
Mark 21,269
granny 17,788
_Ste_ 16,345
Newest Members
Kalena1962, rattus, Lisrush, Emotecreative, ArranGirl13
14,560 Registered Users
New General Forums
New Wirral History
Tall Brick Chimneys
by diggingdeeper - 16th Mar 2024 11:56am
D.I.Y. / Building Shop
by mharford91 - 3rd Mar 2024 8:53pm
1970's Murder in Central Park, Wallasey
by cutespam - 4th Aug 2018 10:28am
Old Hall in Higher Bebington
by Rhoobarb - 25th May 2010 5:55pm
Oleo Works
by Ducko - 14th May 2008 3:09pm
Top Posters(30 Days)
granny 14
casper 13
bri445 4
Topic Replies
What song are you listening to?
by diggingdeeper - 28th Mar 2024 6:06pm
Facial recognition coming in supermarkets?
by diggingdeeper - 27th Mar 2024 3:50pm
Bolts at Bebington Road
by diggingdeeper - 27th Mar 2024 2:33am
Hot Spot Chippie Broadway
by Excoriator - 26th Mar 2024 7:57pm
Tall Brick Chimneys
by diggingdeeper - 26th Mar 2024 5:43pm
Lost river (Well, brook really)
by diggingdeeper - 26th Mar 2024 3:09am
Old Hall in Higher Bebington
by diggingdeeper - 24th Mar 2024 5:58pm
Netflix 3 Body Problem.
by BultacoAstro - 22nd Mar 2024 8:04am
Wisper electric bike. 36v .
by Dilly - 21st Mar 2024 7:36pm
March
M T W T F S S
1 2 3
4 5 6 7 8 9 10
11 12 13 14 15 16 17
18 19 20 21 22 23 24
25 26 27 28 29 30 31
Top Likes Received (30 Days)
Kylix 1
cools 1
Top Likes Received
bert1 14
Mark 4
Gibbo 3
Previous Thread
Next Thread
Print Thread
Joined: Nov 2003
Posts: 12,002
StuyMac Offline OP
Wiki Master
OP Offline
Wiki Master
Joined: Nov 2003
Posts: 12,002
As you may ot may not know, speedos are very inaccurate as you gain more speed, and, as a safety feature they overread

Not only that, but change your wheels and tyres and this also has an effect on your speedo reading.

Sooo, heres a top speed calculator - this uses your rpm, gear ratios, and wheel/tyre sizes to work out your genuine top speed and not an over reading speedos top speed.

There is however inaccuracy in your rev counter too (Though not as much as the speedo) and these also tend to over read. The only way to get a true rev readout is with a direct connection to ECU which reads on the rpm output wire - the apexi stuff is very good for this:

[Linked Image]

As a good example, my old 200, if you went by the speedo reading did 180+mph, however I hit the limiter in 5th a few time in it and this was set to 7200rpm - even though the rev counter read near 7500. Actual speed was 165mph with a reading of 7190 taken on an Apexi AVCR and Super AFC - this kind shows the inaccuracy in the speedo and rev counter.

Anyway, heres the Calculator - have fun laugh

http://www.race-technology.com/WebPage2/Other/Utilities/GearCalculations/GearCalculation.html


What If There Were No Hypothetical Questions?
Google Ads
A
Anonymous
Unregistered
Anonymous
Unregistered
A
what if you dont know the gear ratio's? anywhere we could find them out? help

Joined: Nov 2003
Posts: 12,002
StuyMac Offline OP
Wiki Master
OP Offline
Wiki Master
Joined: Nov 2003
Posts: 12,002
Erm, they may be available in a Haynes manual, failing that a search on the net for gearbox details of your car **should** turn something up smile


What If There Were No Hypothetical Questions?
A
Anonymous
Unregistered
Anonymous
Unregistered
A
oke doke nice one, will have a go at searching for them on the net cool

Joined: Nov 2003
Posts: 12,002
StuyMac Offline OP
Wiki Master
OP Offline
Wiki Master
Joined: Nov 2003
Posts: 12,002
Just worked mine out smile

At 8000rpm in 5th, she'll be doing 199.8mph laugh

Rev limiter with the ECU I have is set at 8500 eek

Just need a few more mods to get up there now laugh


What If There Were No Hypothetical Questions?
Joined: Nov 2003
Posts: 12,002
StuyMac Offline OP
Wiki Master
OP Offline
Wiki Master
Joined: Nov 2003
Posts: 12,002
Blast from the past but the original link no longer works, so heres a new one smile

Top speed calculator.

As an example I entered my cars details:

1st 3.321
2nd 1.902
3rd 1.308
4th 1.000
5th 0.838
Rev 3.382

Max RPM at 7500 (Limiter is set at 8000)

1st 45mph
2nd 79mph
3rd 115mph
4th 151mph
5th 180mph
6th mph
rev 44mph

Gear ratios should be readily available for your car on the net, anyone else fancy posting their ratios, and results???

Last edited by StuyMac; 2nd Jan 2007 10:14am.

What If There Were No Hypothetical Questions?
Joined: Nov 2004
Posts: 7,238
Wiki Addict
Offline
Wiki Addict
Joined: Nov 2004
Posts: 7,238
how true is that of yours stuey, whats ur indicated speed at 7500 in 4th? best to try 3rd as i dont think u wanna be doing 150+ on public roads.

Ill root out my handbook and give this a whirl later.


[Linked Image]
Joined: Nov 2003
Posts: 12,002
StuyMac Offline OP
Wiki Master
OP Offline
Wiki Master
Joined: Nov 2003
Posts: 12,002
No idea lol, but mine reads just under 45mph at 2000rpm in 5th.

Ive only just got the speedo working as it should be since changing back to the original gearbox, but on the other gearbox which was all to pot, I had 7000rpm in 5th, and still pulling strong (On a nice long private road wink )a few weeks ago wink


What If There Were No Hypothetical Questions?

Moderated by  Mod 

Link Copied to Clipboard
Random Wirral Images

Click to View Topic.
Newest Topics
Facial recognition coming in supermarkets?
by Excoriator - 27th Mar 2024 10:52am
Hot Spot Chippie Broadway
by Excoriator - 26th Mar 2024 7:57pm
Bolts at Bebington Road
by Excoriator - 23rd Mar 2024 9:48am
Netflix 3 Body Problem.
by BultacoAstro - 22nd Mar 2024 8:04am
Tall Brick Chimneys
by diggingdeeper - 16th Mar 2024 11:56am
For Sale & Free
Wisper electric bike. 36v .
by Dilly - 21st Mar 2024 7:36pm
This is Elvis
by GingerTom - 17th Mar 2024 2:37pm
Member Spotlight
KevinFinity
KevinFinity
Wirral
Posts: 2,354
Joined: April 2009
Today's Birthdays
There are no members with birthdays on this day.
New Wirral Info
Facial recognition coming in supermarkets?
by Excoriator - 27th Mar 2024 10:52am
Hot Spot Chippie Broadway
by Excoriator - 26th Mar 2024 7:57pm
Bolts at Bebington Road
by Excoriator - 23rd Mar 2024 9:48am
Get your Money Tree ready
by keef666 - 22nd Mar 2023 12:27pm
Restaurant/pub with outdoor seating - Bromborough
by CarterUSM - 7th Aug 2020 7:59pm
News : New Topics
Gaza
by diggingdeeper - 29th Oct 2023 9:28am
Lost river (Well, brook really)
by Excoriator - 10th Sep 2019 8:50am
New Enthusiast Forums
Netflix 3 Body Problem.
by BultacoAstro - 22nd Mar 2024 8:04am
Xbox
by TudorBlue - 3rd Mar 2024 8:48pm
Wiper mechanism needed
by Peter0787 - 20th Feb 2024 4:07pm
What song are you listening to?
by - 24th Jun 2007 9:06am
Popular Topics(Views)
5,069,765 WIKI WALK CHAT
4,013,828 Spotted!
Powered by UBB.threads™ PHP Forum Software 7.7.5