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Technical Guides

A group blog by in General

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About this blog

How-to guides, by members, for owners everywhere.

Entries in this blog

Fix whistling / leaking fresh air centre vents

Hello there this is my first blog or even writing anything like this so I hope that it turns out OK and more importantly is easy to understand for someone that is this as a guide.  A special thanks goes to neilsri130 as this was originally his idea I just put together this blog of my representation of his idea. OK so here goes. Things that you will need: 1 Meter self adhesive door bottom draught excluder (You don't need the glue as shown in the picture but this can be used if

F20 Internals in an F16 Housing

This is a basic how-to on removing the internals from an F16/F20 so you can swap the housings over to allow you to keep your F16 housing.   1   Remove the gear selector turret by removing the four 11mm bolts at the base and giving it a tug and a wiggle.     Disconnecting the gear linkage can make this easier, if you do this make sure you split as in the pic below not by undoing the bolt on the shaft to save you having to reset the selector.     2  Next remove the reverse light switch. This is
  • andy

Rear Disc Conversion

This is a basic how-to on converting to rear disc brakes using mk3 cav or astra hubs. This is a very simple swap and is very worthwhile since the disc setup brings both better braking and easier maintenance.   Now if your thinking of doing this I assume you can remove the beam yourself so im not going through that. The rear brakes will need to be bled afterward and there is a small bit of welding needed on the handbrake adjuster.   The easiest way to do it it to get your hands on a complete mk3
  • andy

F18 5th Gear into an F20

The idea of this mod is to give you better motorway cruising by fitting a WR 5th gear while keeping the decent acceleration of a CR 1st - 4th.   You could just go all fancy like Andy and fit an F28 but this is cheaper and gives you lower revs in 5th than the F28 in 6th.   I'm fitting a WR gear to my F20 but its the same procedure if you want to fit an F16WR 5th into your F16CR or if your fitting an F20 gear cluster into your F16 housing this is a worthwhile mod.   F16s all share the same select
  • andy

Gear Ratios

3-Speed Automatic   1st  2.48 2nd 1.6 3rd  1.0     1300 Early 4 Speed:   1st 3.636 2nd 2.211 3rd 1.429 4th 0.969   Final Drive Gear 4.18 to 1   1600 Early 4 Speed:   1st 3.545 2nd 2.158 3rd 1.370 4th 0.971   Final Drive Gear 3.74 to 1   1600 Early 5 Speed SRi   1st 3.42 2nd 1.95 3rd 1.28 4th 0.89 5th 0.71   Final Drive 3.47 to 1     Mid Spec SRi 1800i   1st 3.42 2nd 2.16 3rd 1.48 4th 1.12 5th 0.89   Final Drive 3.94 to 1   Late Spec 2.0 SRi's   1st 3.4 2nd 2.2 3rd 1.5 4th 1.1 5th 0.89   Final Dr
  • andy

Fitting longer front subframe arms to a 1.3 or 1.6 shell

This has come up a few times now and as decent shells 1.8 & 2.0 become more scarce using lower spec cars as a project base makes more sense.   The main difference between the 1.3-1.6 shell and the 1.8-2.0 shell is that the 1.8-2.0 has a more beefy front subframe and crossmember setup. The issue is that you cannot simply transfer the subframe across. The longer subframe is located by 2 bolts in the centre while
  • Frisco
Engines

Bosch Motronic 20XE / C20XE 4.1 / 2.5 / Overview

Put this together for my 20XE from a service manual. Found the entry for the 2.5 on the Corsa forum. Hope it's of some use! Mods/Admins: Feel free to make additions / extensions / corrections. NB: The 4.1 version is first, followed by the later 2.5 catalysed version that also has a dizzy.  Not for coilpack / dispak  setups per se (sorry Greg!), but these were similar to the 2.5 version which follows the 4.1 version.  NB: Early 20XE's - These first valvers may have different loom c
Engines

Bosch Motronic Engine Codes

Bosch Motronic Systems12 Initiation of diagnosis. n/a13 Oxygen sensor No change in voltage/open circuit.14 Coolant Temperature Sensor (CTS) Low voltage15 Coolant Temperature Sensor (CTS) High voltage16 Knock sensor 1 No change in voltage17 Knock sensor 2 No change in voltage18 Knock control unit No signal, Engine Control Unit (ECU) fault19 RPM signal (crankshaft sensor) Incorrect signal21 Throttle position sensor High voltage22 Throttle position sensor Low voltage23 Knock sensor module n/a24 Veh

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