Kaaz Close Ratio Gear Set - Experiences and Recommended Trans Shops - LotusTalk - The Lotus Cars Community
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post #1 of 10 (permalink) Old 07-10-2018, 09:36 AM Thread Starter
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Kaaz Close Ratio Gear Set - Experiences and Recommended Trans Shops

Who here has firsthand experience with the Kaaz close ratio gear set for the Toyota C60/64 transmission (link below)?

https://www.monkeywrenchracing.com/p...0-close-ratio/

I've been competing with my 2005 Lotus Elise in NASA Great Lakes Region TT4 time trials and have started to finally nab some first places and track records on shorter tighter tracks. The free Hoosiers are real nice too However at tracks with huge straights like Mid-Ohio and Pitt Race, it's a huge battle for me even to place third as the higher-powered cars can take more advantage of the super long straights. I'm In the TT4/ST4 class there is no way I can add more power as I violate class rules, but improved transmission gearing and better shocks are low-hanging fruit, as my aero package is also at the limit of class rules. Car is also running on 15" Miata wheels, which made a HUGE difference in lap times compared to the stock 16/17" wheels.

The idea of improved gearing aligns with my philosophy of improving a car without sacrificing reliability, so I'm really curious to explore.

My biggest concern with changing the gear set in my transmission is installation support. I can take the trans out of my car no problem, but don't have the tools to service the gears.
I've seen a handful of horror stories about MWR, thus am naturally apprehensive to go with them, even though they're practically in my backyard. What does everyone think?

Who else could assist with the gear installation?

Are Kaaz gears reliable in my naturally aspirated application?

Considering labor costs and replacement of wear items like bearings/synchros, am I better off getting a whole new transmission with the gears already installed?

Appreciate the help in advance!

2005 Lotus Elise, naturally aspirated and always at redline!
2018 NASA Great Lakes Region TT4 Champion
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post #2 of 10 (permalink) Old 07-10-2018, 10:15 AM Thread Starter
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@fzust and @turbophil

Any insight from your customer base?

2005 Lotus Elise, naturally aspirated and always at redline!
2018 NASA Great Lakes Region TT4 Champion
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post #3 of 10 (permalink) Old 07-10-2018, 05:39 PM
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Purchased Kaz Transmission from MWR on advice of Phil at BOE and it has been good. He thought despite MWR rep it was the best at the time.

Driven hard on the track.
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post #4 of 10 (permalink) Old 07-10-2018, 05:49 PM
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Well if you are asking freds opinion I am sure that he is going to recommend his gear set! Did you do some math to see if it would work for you?

2007 Exige S with almost every track mod...
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post #5 of 10 (permalink) Old 07-13-2018, 03:38 AM Thread Starter
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Originally Posted by kfennell View Post
Well if you are asking freds opinion I am sure that he is going to recommend his gear set! Did you do some math to see if it would work for you?
This morning, I calculated the new speeds for each gear using the following calculator: Gear Ratio Speed Calculator

Using 22.8" for tire diameter (225/45/R15 Hoosier A7) and 8500 rpm, here are my results of the Kaaz with a final drive ratio of 4.5:1. In addition, I've included stock ratios for comparison.

GEAR–KAAZ
1ST—2.923--> speed, MPH: 44
2ND—2.188--> speed, MPH: 59
3RD—1.706--> speed, MPH: 75
4TH—1.364--> speed, MPH: 94
5TH—1.167--> speed, MPH: 110
6TH—0.916--> speed, MPH: 140

GEAR-STOCK
1ST—3.166--> speed, MPH: 40
2ND—2.050--> speed, MPH: 62
3RD—1.481--> speed, MPH: 87
4TH—1.166--> speed, MPH: 110
5TH—0.916--> speed, MPH: 140
6TH—0.725--> speed, MPH: 177

On paper, it looks like an improvement. My only concern is if I'll run out of gear in 6th with the Kaaz close ratios? How would I go about figuring this out? My gut feel is that it would be a miracle if I could hit 140 MPH on the back straight of Mid-Ohio, as I'm only getting up to 123 MPH today.

2005 Lotus Elise, naturally aspirated and always at redline!
2018 NASA Great Lakes Region TT4 Champion
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post #6 of 10 (permalink) Old 07-13-2018, 03:49 AM
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Quote:
Originally Posted by countryboyshane View Post
This morning, I calculated the new speeds for each gear using the following calculator: Gear Ratio Speed Calculator

Using 22.8" for tire diameter (225/45/R15 Hoosier A7) and 8500 rpm, here are my results of the Kaaz with a final drive ratio of 4.5:1. In addition, I've included stock ratios for comparison.

GEAR–KAAZ
1ST—2.923--> speed, MPH: 44
2ND—2.188--> speed, MPH: 59
3RD—1.706--> speed, MPH: 75
4TH—1.364--> speed, MPH: 94
5TH—1.167--> speed, MPH: 110
6TH—0.916--> speed, MPH: 140

GEAR-STOCK
1ST—3.166--> speed, MPH: 40
2ND—2.050--> speed, MPH: 62
3RD—1.481--> speed, MPH: 87
4TH—1.166--> speed, MPH: 110
5TH—0.916--> speed, MPH: 140
6TH—0.725--> speed, MPH: 177

On paper, it looks like an improvement. My only concern is if I'll run out of gear in 6th with the Kaaz close ratios? How would I go about figuring this out? My gut feel is that it would be a miracle if I could hit 140 MPH on the back straight of Mid-Ohio, as I'm only getting up to 123 MPH today.
I might hit 140 at cota in a tt2 car if its 60 out. Probably not a concern in a tt4 car?#

2007 Exige S with almost every track mod...
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post #7 of 10 (permalink) Old 07-13-2018, 05:44 AM Thread Starter
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Originally Posted by kfennell View Post
I might hit 140 at cota in a tt2 car if its 60 out. Probably not a concern in a tt4 car?#
I can see that for you, but you're also supercharged. I put down 177 to the ground in naturally aspirated trim
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2005 Lotus Elise, naturally aspirated and always at redline!
2018 NASA Great Lakes Region TT4 Champion
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post #8 of 10 (permalink) Old 07-16-2018, 04:38 AM
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The BWR gearset and the Kaaz gearset are highly complementary. The BWR gear set is long 1st and 2nd with tighter 3-4-5. It is great for boosted cars and big power cars. The KAAZ gearset was designed for the NA car and is shorter overall. I've built numerous World Challenge KAAZ boxes with strong success. While I don't think the KAAZ gearset is as strong as the BWR gearset, it is stronger than stock.

If you decide to go with the KAAZ, which looks like a good fit except bigger tracks, you could get a set of 17x9 rear wheels 6 ULs which we do have available and run a taller tire for the big track. Several racers do this. Optimize for your main stomping grounds and a cheap option for big tracks.

Our race spec build is much more involved that the standard build. Shane, if you are interested or further discussion of options, drop us an email at [email protected] or we can chat on the phone.


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post #9 of 10 (permalink) Old 07-16-2018, 07:14 AM Thread Starter
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Quote:
Originally Posted by fzust View Post
The BWR gearset and the Kaaz gearset are highly complementary. The BWR gear set is long 1st and 2nd with tighter 3-4-5. It is great for boosted cars and big power cars. The KAAZ gearset was designed for the NA car and is shorter overall. I've built numerous World Challenge KAAZ boxes with strong success. While I don't think the KAAZ gearset is as strong as the BWR gearset, it is stronger than stock.

If you decide to go with the KAAZ, which looks like a good fit except bigger tracks, you could get a set of 17x9 rear wheels 6 ULs which we do have available and run a taller tire for the big track. Several racers do this. Optimize for your main stomping grounds and a cheap option for big tracks.

Our race spec build is much more involved that the standard build. Shane, if you are interested or further discussion of options, drop us an email at [email protected] or we can chat on the phone.
Fred,

Thanks a lot for responding!

Based on the gearing of the BWR set, it looks like it wouldn't be the best fit for me as I'm naturally aspirated. I'm going to get blacklisted by all the supercharged guys by saying this, but I'll never supercharge my Elise. I'd rather buy a different car than jump down that deep hole. It's probably just the NASA Great Lakes region, but the largest competitive field is in TT4/ST4 and thins out a TON in TT2/ST2 and above. Definitely not the case will all regions though!

Again, thanks for reaching out

2005 Lotus Elise, naturally aspirated and always at redline!
2018 NASA Great Lakes Region TT4 Champion
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post #10 of 10 (permalink) Old 07-16-2018, 08:35 AM
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Originally Posted by countryboyshane View Post
Fred,

Thanks a lot for responding!

Based on the gearing of the BWR set, it looks like it wouldn't be the best fit for me as I'm naturally aspirated. I'm going to get blacklisted by all the supercharged guys by saying this, but I'll never supercharge my Elise. I'd rather buy a different car than jump down that deep hole. It's probably just the NASA Great Lakes region, but the largest competitive field is in TT4/ST4 and thins out a TON in TT2/ST2 and above. Definitely not the case will all regions though!

Again, thanks for reaching out
Here the big classes are 5 and 3 at least in terms of the most competitive, but there are always lots of cars in 2 and it's a lot easier to win then 3 so here I am, I will probably have to go back to 3 if I cage the car as I will be too heavy for 2, so I will need to get better at driving!

2007 Exige S with almost every track mod...
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