AAZ Syncro gear ratios

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AAZ Syncro gear ratios

Postby Dobble » 08 Mar 2018, 14:25

Hi guys

I'm looking for some information on gear ratios for my AAZ powered Syncro. I've only owned the vehicle for a few weeks but drove it 550 miles home when I bought it and found that at 60 MPH it sounded like it was revving too high (just over 3000 RPM). I spoke to Aidan Talbot as I notice he offers a 0.7 4th gear ratio (currently running a 0.78) and he'll be doing my rebuild in the future. Aidan felt that the 0.7 ratio would be too much of jump when changing from 3rd to 4th and more suited to TDI powered Syncros but he did say he didn't know too much about diesel Syncros. So what ratios do you guys run in your AAZ gearbox? I'm now looking to see if the 0.73 ratio would be more suitable. My van is running a stage one turbo with 10 psi of boost and a fuel boost pin to give you an idea of the state of tune and I'm running 215/75r15 tyres.

Any help or information on whats good and whats not will be gratefully received.

Thanks
Ben
1987 T25 AAZ powered RHD Syncro
Check out our blog: https://ben6738.wixsite.com/syncrovanlife
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Re: AAZ Syncro gear ratios

Postby 4x4 Bus » 08 Mar 2018, 20:45

Leave the ratios as they are. Any thing longer will make an AAZ horrible to drive and also result in the engine labouring. This in turn will vastly increase EGT temperatures, engine temperatures and fuel consumption which are not good for your engine.
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Re: AAZ Syncro gear ratios

Postby Al Housman » 08 Mar 2018, 22:20

I concur with that and would add that it wouldn't hurt to spend your money on an oil cooler and/or intercooler. From experience I've found the AAZs need some help in the cooling department!
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Re: AAZ Syncro gear ratios

Postby Dobble » 09 Mar 2018, 08:35

Thanks very much for your replies. Yes I am running an oil cooler but not an intercooler yet. I do intend to fit one though. I've found the cooling to be satisfactory so far. I have a digital water temperature gauge (engine stays at mid to high 80's) and an EGT gauge which starts to read at 200 degrees but I haven't had it that hot yet (haven't tried it since the boost pin was fitted though). From what people have said I'll leave the fourth gear ratio as is.

Thanks again
Ben
1987 T25 AAZ powered RHD Syncro
Check out our blog: https://ben6738.wixsite.com/syncrovanlife
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Re: AAZ Syncro gear ratios

Postby wolfbus.uk » 26 Mar 2018, 14:30

Dobble wrote:Thanks very much for your replies. Yes I am running an oil cooler but not an intercooler yet. I do intend to fit one though. I've found the cooling to be satisfactory so far. I have a digital water temperature gauge (engine stays at mid to high 80's) and an EGT gauge which starts to read at 200 degrees but I haven't had it that hot yet (haven't tried it since the boost pin was fitted though). From what people have said I'll leave the fourth gear ratio as is.

Thanks again
Ben


think you're making the right choice leaving it alone as others have said. Just put a new AAZ in mine (replacing JX) and it revs 3000 at 56.8 mph & around 3200 at 60mph.

Good on hills, good cruising although probably 60 to 63 or so is what I'd sit at on motorways etc. I've been used to this ratio for 3 or 4 years now. I find the gear spacing vs engine power an excellent match with the AAZ and even though it may feel like you could get a longer 4th gear, you'll probably find you'll be spending a lot more time in 3rd gear than you currently do now.
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Re: AAZ Syncro gear ratios

Postby jebiga41 » 29 Mar 2018, 19:27

yep as the others have said leave it as is mines an aaz with 215 75 15 and runs fine with 3000 at 60 and .78
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Re: AAZ Syncro gear ratios

Postby HarryMann » 31 Mar 2018, 22:44

Dobble wrote:Hi guys

I'm looking for some information on gear ratios for my AAZ powered Syncro. I've only owned the vehicle for a few weeks but drove it 550 miles home when I bought it and found that at 60 MPH it sounded like it was revving too high (just over 3000 RPM). I spoke to Aidan Talbot as I notice he offers a 0.7 4th gear ratio (currently running a 0.78) and he'll be doing my rebuild in the future. Aidan felt that the 0.7 ratio would be too much of jump when changing from 3rd to 4th and more suited to TDI powered Syncros but he did say he didn't know too much about diesel Syncros. So what ratios do you guys run in your AAZ gearbox? I'm now looking to see if the 0.73 ratio would be more suitable. My van is running a stage one turbo with 10 psi of boost and a fuel boost pin to give you an idea of the state of tune and I'm running 215/75r15 tyres.

Any help or information on whats good and whats not will be gratefully received.

Thanks
Ben
Std V box 5.43 and 15" 215s ATs
About right... 3800 @70 mph ?
The AAZ is safe to 5000 at least. but i wouldn't cruise it much above

interested to hear what EGTs you get
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