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  #621  
Old January 12th, 2015, 08:30 PM
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john
97 D90 ST / 1957 S1 109/ 1983 LS110
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CONVERSION COMPLETE!! Off to the exhaust shop tomorrow..
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  #622  
Old January 12th, 2015, 09:28 PM
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Adam
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John are you bringing this one to the Winter Romp by chance? After my troubles with the 200Tdi I am thinking of bailing on the diesel train and going Gen IV.
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  #623  
Old January 12th, 2015, 10:05 PM
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Quote:
Originally Posted by transientmechanic View Post
John are you bringing this one to the Winter Romp by chance? After my troubles with the 200Tdi I am thinking of bailing on the diesel train and going Gen IV.
Adam I won't be bringing the truck to romp but happy to tell you about the swap while we are there.
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  #624  
Old January 13th, 2015, 12:35 PM
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Jon
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I was doing some gear ratio calculations for my upcoming swap. Aerodynamics aside, the theoretical top speed of the 6.2L Camaro engine and trans with 33" tires is 176 mph if you keep the 1.41 high range. If you switch to 1.22, it's 204.

Seriously though, I built a spreadsheet to figure out final drive ratios and whatnot. My Camaro donor vehicle has a first gear overall ratio of 13:1. 1.22 high range gives a 1st gear ratio of 17:1, 1.41 high range is 20:1 in 1st.

Factoring in the 33's in 6th gear, 1.41 high range should turn about 2000 rpm @ 60 mph, and 2600 @ 75. 1.22 high range turns 2000 rpm @ 68, with 2200 @ 75. By contrast, the camaro is 2000 rpm @ 70...pretty darn close to the 1.22/33" combo (3.54 stock diff gears). It's even closer for 35's.

I'll probably stick with the 1.41 simply because I'm in CO. Lacking O2, and climbing big hills takes more rpm. Plus, the camaro is tuned for premium, a new tune for mid-grade will drop the power and torque a little. For you flat-landers though, you might consider switching to the 1.22 for better cruising.

Low range 1st gear crawl ratio is 42.26:1. By comparison, my crawler running a LQ4 6.0L, TH400, 3.4 Atlas, 5.13 gears and 42" tires is 43.26:1 and does just fine.
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  #625  
Old January 13th, 2015, 12:58 PM
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Nicholas Markiw
1994 NAS D90 LS 5.3L
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I'm running 1.003:1 LT230, 4.11 gears and 35" tires. The only way you will get any mileage out of these LS engines is to keep the RPMs down at highway speeds. It has plenty of torque. Plus you want an overdrive gear on the highway not a business gear.

With this setup I have plenty of power. On the highway it was in 5th and 6th. 6th on the straights, 5th uphill, 4th to pass. And this is a 5.3L not a 6.2L.

Just my two cents. You should consider the highway cruising speeds/RPMs not top speed. First gear is plenty low enough. Interesting calcs though. Don't really want to take my D90 more than 100MPH. Except if I have to humiliate a J**p. (very gratifying)

My Silverado has a 6.0L (LY6), 6L90e, 3.73 gears (Eaton 14-bolt w/locker), and 31" tires. Of course the transfer case is 1:1. It can tow 11,000 lbs. I can tow a D90 on my BigTex trailer uphill at 65MPH without breaking a sweet. Plug those numbers into your spread sheet and see how they compare. This definitely is an issue that you must work out for your conversion. Most cases you will have to jump up a ratio in the LT230.

Quote:
Originally Posted by TMWTP View Post
I was doing some gear ratio calculations for my upcoming swap. Aerodynamics aside, the theoretical top speed of the 6.2L Camaro engine and trans with 33" tires is 176 mph if you keep the 1.41 high range. If you switch to 1.22, it's 204.

Seriously though, I built a spreadsheet to figure out final drive ratios and whatnot. My Camaro donor vehicle has a first gear overall ratio of 13:1. 1.22 high range gives a 1st gear ratio of 17:1, 1.41 high range is 20:1 in 1st.

Factoring in the 33's in 6th gear, 1.41 high range should turn about 2000 rpm @ 60 mph, and 2600 @ 75. 1.22 high range turns 2000 rpm @ 68, with 2200 @ 75. By contrast, the camaro is 2000 rpm @ 70...pretty darn close to the 1.22/33" combo (3.54 stock diff gears). It's even closer for 35's.

I'll probably stick with the 1.41 simply because I'm in CO. Lacking O2, and climbing big hills takes more rpm. Plus, the camaro is tuned for premium, a new tune for mid-grade will drop the power and torque a little. For you flat-landers though, you might consider switching to the 1.22 for better cruising.

Low range 1st gear crawl ratio is 42.26:1. By comparison, my crawler running a LQ4 6.0L, TH400, 3.4 Atlas, 5.13 gears and 42" tires is 43.26:1 and does just fine.
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  #626  
Old January 13th, 2015, 03:21 PM
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Jon
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Top speed wasn't my concern at all. Just popped up when I ran the calcs. Made me laugh. No way in heck I'm taking a 110 over 100 mph.

Your 6th gear overall drive is 2.75, turning 35's. About the same as running the 1.22 high range with 3.54 diffs (2.88), but with taller tires. Hmm. By changing to 1.003, with 33's, and 3.54 diffs, 6th gear is over 80 mph at 2000 rpm.

The good news is I'll have a 110 and D1 tcase to choose from. Still up in the air on what size tires I'm going to run. If I do decide on 35's, pretty sure I'll go with the 1.22. That would be 2100 rpm at 75, which is the highest limit in CO anyway, but I should be in the power band enough that the steeper climbs up Floyd Hill, Eisenhower, and Vail Pass won't be lugging the motor.

I'm glad you spoke up though. The numbers feel pretty meaningless without some first-hand experience driving it.
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  #627  
Old January 13th, 2015, 03:31 PM
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John B.
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The top gear should be set to work on the flats at constant speed, for maximum efficiency. It then shifts down for hills and accelerating. Top gear should never be chosen for climbing.
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  #628  
Old January 13th, 2015, 03:42 PM
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Jonathan, you could compare the gear ratios and engine power to your LR4 to get a frame of reference. They probably have about the same "resistance" at highway speed (LR4 a little sleeker, 110 a little lighter).

LR4 ratios

1st: 4.17
2nd: 2.34
3rd: 1.52
4th: 1.14
5th: 0.87
6th: 0.69

Transfer case high range 1:1, low range 2.93:1

Diff ratio: 3.54

30" tall factory tire

LR4 5.0 V8 is 375hp/375tq

Anyone who has driven an LR4 knows how magnificent this powertrain is... an LS/6L80 swap would basically emulate it in a Defender
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  #629  
Old January 13th, 2015, 03:50 PM
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John B.
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What is "normally" done to proper size the final drive.... Work out the power required to move the vehicle versus speed. Find out the wheel power available versus speed. Decide on a maximum speed you want to be able to maintain, on the flat, with no wind without dropping down a gear. Plot and adjust final drive to suit. This gives you the best mileage.

I suspect with this engine, you can't go high enough on the gearing.

Like this:
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  #630  
Old January 13th, 2015, 05:24 PM
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Great info. I assumed that GM had that already figured out, that's why I was trying to match my RPM @ 70 mph to what they used, hoping to be in the right ballpark.
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  #631  
Old January 13th, 2015, 05:39 PM
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It takes a lot more power to move a Defender down the road at 70 compared to a camaro. But, there's probably power to spare at that RPM so you should be OK!
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  #632  
Old January 13th, 2015, 05:41 PM
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Quote:
Originally Posted by transientmechanic View Post
It takes a lot more power to move a Defender down the road at 70 compared to a camaro. But, there's probably power to spare at that RPM so you should be OK!
Good info and food for thought! With my rack loaded, I think I have the drag coefficient of a house! ;-)
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  #633  
Old January 13th, 2015, 07:53 PM
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If I can run 90 with a TDI and a 1.2 you can run 75 with the 6.2 and any gearing.
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  #634  
Old January 13th, 2015, 08:04 PM
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As I explained earlier the higher the gearing the better for efficiency. There is no way to have gearing that is too high with that much power and the options available. Should run a 1.0 high range.
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  #635  
Old January 13th, 2015, 08:59 PM
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I believe the 1.003 high range gears are still available new... hopefully they are not just limited supply NOS. As this conversion continues to build momentum there will probably be a strong demand.

By the way, on a slightly different note... the ultimate LT230 would be 1.003 high, 49% reduction (5:1) low, and limited slip center diff!
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  #636  
Old January 13th, 2015, 09:16 PM
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Andy
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Quote:
Originally Posted by transientmechanic View Post
and limited slip center diff!
Already available from Ashcroft......

http://www.ashcroft-transmissions.co...-atb-diff.html
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  #637  
Old January 13th, 2015, 09:27 PM
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Yes quaife and ashcroft have both had them for some time all parts quoted in the above LT230 build are currently available in the aftermarket.
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  #638  
Old January 22nd, 2015, 11:36 AM
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john
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went out for my first test drive with the newly LS powered 110…

Initial impressions…


HOLY SH$#T!!
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  #639  
Old January 22nd, 2015, 11:37 AM
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Justin
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Quote:
Originally Posted by phoenix37 View Post
went out for my first test drive with the newly LS powered 110…

Initial impressions…


HOLY SH$#T!!
I am jealous!
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  #640  
Old January 22nd, 2015, 11:45 AM
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john
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trust me its worth the wait and you are well on your way… My NAS 110 always felt like a slug…this thing rips! time to invest in some better brakes!
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