BPT from a 1991 Mazda 323 GTX
For a simple BP-BPT conversion you will need the following minimum: (money in GBP £)
- Motor
For the standard conversion, I recommend buying a GTX or GTR Half cut from Japan. This will come with motor, ecu, wiring harness, intercooler and plumbing.
Any parts not used can be sold off.
Cost is generally around the £1000 mark
- Replacement Clutch
Recommend a single plate organic HD clutch for a basic conversion. Expect to pay around £150-200. Daiken is an excellent brand although there are others.
- Belts/Seals/Oils
You should always replace all belts, seals and lubricants in the motor.
Cost will be around £100/150 all up.
- Labour Charges
Any general mechanic can put do this conversion as it is as simple as remove and replace. Expect to pay anywhere upto £500 for this. You will also need someone to wire the motor in using the standard harness. Your mechanic may be able to do it, if not any auto electrician can do it for you. This will cost upto £200 generally.
This will provide you with a basic turbo conversion.
Total cost (excluding insurance) = 2K max. if you are lucky and know the right people or are doing the work yourself = £1150 or so.
Please be aware the above is based on a half cut. Engines can be bought separate if required. They are roughly 700 pounds (excluding ECU, wiring looms, intercooler and plumbing.)
There are 2 gearboxes commonly found in Astinas.
G25M-R
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Commonly found in DOHC BG Astina SP and 94/95 BA Astinas.
Used with
BP-ZE (MY92-94) & BP-DE (MY95)
Type
5MT, FWD
1st gear
3.307:1
2nd gear
1.833:1
3rd gear
1.310:1
4th gear
1.030:1
5th gear
0.795:1
Final drive
4.105:1
Reverse
3.166:1
Differential
open
Shift mechanism
remote, rod actuation
F25M-R
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Commonly found in 95+ BA Astinas (possibly other models)
Used with
B8-ME (MY92- 94) | Z5-DE | ZM-DE & ZL-DE | FP-DE & (MY96+) BP-DE | ZL-VE
Type
ALL 5MT, FWD
1st gear
3.416:1 | 3.416:1 | 3.416:1 | 3.416:1 | 3.416:1
2nd gear
1.842:1 | 1.842:1 | 1.842:1 | 1.842:1 | 1.842:1
3rd gear
1.290:1 | 1.290:1 | 1.290:1 | 1.290:1 | 1.290:1
4th gear
0.918:1 | 0.972:1 | 0.972:1 | 1.028:1 | 0.918:1
5th gear
0.731:1 | 0.775:1 | 0.775:1 | 0.775:1 | 0.731:1
Final drive
3.619:1 | 4.105:1 | 3.850:1 | 4.105:1 | 4.388:1
Reverse
3.214:1 | 3.214:1 | 3.214:1 | 3.214:1 | 3.214:1
Differential
All open
Differences
=======
- Larger Driveshafts in the G25M-R
- Larger Clutch plate in the G25M-R
- Smaller Casing on the F25M-R (less webbing so less strength)
Notes
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The GTX flywheel will fit in a G25M-R box but not a F25M-R box
Please note it is a better option to go for the G series gearbox and drive shafts as they are stronnger.
If anyone has anymore info please feel free to add, or if you need any more info... please feel free to contact me.
