Rate my gearbox

Topics relating to the Lotus Exige S2 (series 2)
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Fonzey
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Joined: Tue Nov 27, 2018 12:17 am

Good info, thanks for that. Did you upgrade to the SSC stuff after a failure on your stock box?

The gearbox man I've spoken with about doing this work has said he'll give all the synchro's a going over for me (whatever that means) but the replacement don't seem to be that expensive from Toyota so I'd just get them replaced if needed.

I've been there/done that with "ruining a car for the road", I hope I've learned from it and I do keep that in mind when choosing parts etc. I'm under no illusion though, once I've run out of sensible mods to do to a car I quickly lose my attention span and look towards something else. I could do with a cheaper hobby, Class A drugs for example.
661
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Joined: Fri Sep 11, 2009 4:36 pm
Location: East Sussex

Fonzey wrote: Thu Oct 22, 2020 9:17 pm Good info, thanks for that. Did you upgrade to the SSC stuff after a failure on your stock box?

The gearbox man I've spoken with about doing this work has said he'll give all the synchro's a going over for me (whatever that means) but the replacement don't seem to be that expensive from Toyota so I'd just get them replaced if needed.

I've been there/done that with "ruining a car for the road", I hope I've learned from it and I do keep that in mind when choosing parts etc. I'm under no illusion though, once I've run out of sensible mods to do to a car I quickly lose my attention span and look towards something else. I could do with a cheaper hobby, Class A drugs for example.
I hadn't had a failure but it was only a matter of time that 3rd or 4th went. So I did those as i increased the power. Strengthen those and it's the next weakest link, which to my mind was the FD, so repalced that too.
The sychro and bearings are cheap and you just need to consider them consumables. The expecnse is the gearbox removal and relacement. I can't recall but 7-9 hours rings a bell.
I recommend Competition Transmission Services for the rebuild stuff.
Graeme
661
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Location: East Sussex

Also , I note Dave's comment about the cooler, but I needed one. At Spa gearbox oil was soon up to 110deg and continuing to rise without switching on the cooler, which kept it at just over 100.
Graeme
seriouslylotus
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661 wrote: Sat Oct 24, 2020 10:02 am Also , I note Dave's comment about the cooler, but I needed one. At Spa gearbox oil was soon up to 110deg and continuing to rise without switching on the cooler, which kept it at just over 100.
My gear box has not been above 80 degrees so far with the Kaaz gears kit (No cooler installed)
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Fonzey
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Cheers Gents, all good info.

I've got monitoring for the gearbox temps so the car will initially run without a cooler, and I'll see what happens when I get it on track next year. I've got data to compare against from an OEM gearbox and there's every chance that running chunkier gears with finer tolerances will generate more heat so I'll keep an eye on it. I've got a cooler install all planned out, pretty sure I know exactly what parts I'll buy to make it up and it's not that expensive in the grand scheme of things... I just don't want to be adding a lump of weight and complexity until I know it's needed.
661 wrote: Sat Oct 24, 2020 10:00 am The expecnse is the gearbox removal and relacement. I can't recall but 7-9 hours rings a bell.
I recommend Competition Transmission Services for the rebuild stuff.
This has been a pleasant surprise, spoken with a couple of specialists and the rebuild costs are actually pretty low and that's the only part I'll be outsourcing. Removing the box from the car and reinstallation will all just cost me my own time so that should help.

If I wasn't so set on having an LSD fitted, I'd probably just leave the whole lot alone (until it blows up, if it ever does) but since I'll be going to that effort to get the box out/dismantled - I've talked myself into doing the upgrades at the same time.
661
Posts: 1475
Joined: Fri Sep 11, 2009 4:36 pm
Location: East Sussex

Fonzey wrote: Sat Oct 24, 2020 5:04 pm Cheers Gents, all good info.

I've got monitoring for the gearbox temps so the car will initially run without a cooler, and I'll see what happens when I get it on track next year. I've got data to compare against from an OEM gearbox and there's every chance that running chunkier gears with finer tolerances will generate more heat so I'll keep an eye on it. I've got a cooler install all planned out, pretty sure I know exactly what parts I'll buy to make it up and it's not that expensive in the grand scheme of things... I just don't want to be adding a lump of weight and complexity until I know it's needed.
661 wrote: Sat Oct 24, 2020 10:00 am The expecnse is the gearbox removal and relacement. I can't recall but 7-9 hours rings a bell.
I recommend Competition Transmission Services for the rebuild stuff.
This has been a pleasant surprise, spoken with a couple of specialists and the rebuild costs are actually pretty low and that's the only part I'll be outsourcing. Removing the box from the car and reinstallation will all just cost me my own time so that should help.

If I wasn't so set on having an LSD fitted, I'd probably just leave the whole lot alone (until it blows up, if it ever does) but since I'll be going to that effort to get the box out/dismantled - I've talked myself into doing the upgrades at the same time.
Agrreed , the cost was OK once the box was out. Something in the order of £600-700
Graeme
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Fonzey
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I've decided to go ahead with most of this plan, though it's hit a hiccup already.

The Komotec FD that I'd chosen from their website doesn't actually exist when I've made an effort to actually buy it. They have another offering in the pipeline, but we know how those pipelines can stretch. I'm keen not to drop my gearbox until I have parts in my hand in fear of being stuck without a car in Spring.

I'll keep an eye on it, but alternatives in the market seem to be thin on the ground. The Jubu one is straight cut and quite a bit more expensive than the imaginary KT one was. I know SSC used to do one (I plan to use SSC gears for 3rd/4th) but I can't find it listed anywhere anymore, so perhaps it got discontinued.

Other options are:

- Rebuild box and retain stock FD and chance it
- Rebuild box with the lower ratio Toyota FD which is more readily available and is stronger due to fewer teeth... but that would mess up my ratio plans

Hmmm :?:
ade
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Joined: Thu Sep 21, 2006 10:40 am
Location: Essex

Fonzey wrote: Thu Nov 26, 2020 10:48 am I've decided to go ahead with most of this plan, though it's hit a hiccup already.

The Komotec FD that I'd chosen from their website doesn't actually exist when I've made an effort to actually buy it. They have another offering in the pipeline, but we know how those pipelines can stretch. I'm keen not to drop my gearbox until I have parts in my hand in fear of being stuck without a car in Spring.

I'll keep an eye on it, but alternatives in the market seem to be thin on the ground. The Jubu one is straight cut and quite a bit more expensive than the imaginary KT one was. I know SSC used to do one (I plan to use SSC gears for 3rd/4th) but I can't find it listed anywhere anymore, so perhaps it got discontinued.

Other options are:

- Rebuild box and retain stock FD and chance it
- Rebuild box with the lower ratio Toyota FD which is more readily available and is stronger due to fewer teeth... but that would mess up my ratio plans

Hmmm :?:
My car is still going strong with the original FD and jubu 3/4 gears, to be fair, it is not my original box as that was so ruined when I drove it 330miles back from Spa with no third gear it was only useful as scrap, but I did buy another box from a 2006 car and that is still on it's original FD and is still running with 300hp, personally I'd chance it. 3/4 are chocolate whereas the FD is made of tough cheese ;)
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Fonzey
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ade wrote: Mon Jan 18, 2021 2:24 pm
Fonzey wrote: Thu Nov 26, 2020 10:48 am I've decided to go ahead with most of this plan, though it's hit a hiccup already.

The Komotec FD that I'd chosen from their website doesn't actually exist when I've made an effort to actually buy it. They have another offering in the pipeline, but we know how those pipelines can stretch. I'm keen not to drop my gearbox until I have parts in my hand in fear of being stuck without a car in Spring.

I'll keep an eye on it, but alternatives in the market seem to be thin on the ground. The Jubu one is straight cut and quite a bit more expensive than the imaginary KT one was. I know SSC used to do one (I plan to use SSC gears for 3rd/4th) but I can't find it listed anywhere anymore, so perhaps it got discontinued.

Other options are:

- Rebuild box and retain stock FD and chance it
- Rebuild box with the lower ratio Toyota FD which is more readily available and is stronger due to fewer teeth... but that would mess up my ratio plans

Hmmm :?:
My car is still going strong with the original FD and jubu 3/4 gears, to be fair, it is not my original box as that was so ruined when I drove it 330miles back from Spa with no third gear it was only useful as scrap, but I did buy another box from a 2006 car and that is still on it's original FD and is still running with 300hp, personally I'd chance it. 3/4 are chocolate whereas the FD is made of tough cheese ;)
I ended up going for a Kaaz FD. The Komotec leadtime stretched out again and I wanted to get a move on, the Kaaz was also much, much cheaper than either the KT or Jubu options - hopefully not because it's another variety of cheese :lol:

It did mean going 4.8 rather than 5.0, so not quite as aggressive on the ratios as my initial plan but should still be a nice step up from stock and the improved acceleration I get will hopefully go some way to justifying all of the cost/effort.
ade
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Fonzey wrote: Mon Jan 18, 2021 2:52 pm
I ended up going for a Kaaz FD. The Komotec leadtime stretched out again and I wanted to get a move on, the Kaaz was also much, much cheaper than either the KT or Jubu options - hopefully not because it's another variety of cheese :lol:

It did mean going 4.8 rather than 5.0, so not quite as aggressive on the ratios as my initial plan but should still be a nice step up from stock and the improved acceleration I get will hopefully go some way to justifying all of the cost/effort.
Hope you are putting in the taller Celica 6th gear?
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