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| matts85vet | top speed in D(3rd) or overdrive(4th)? | ||
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Guru
 
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will my top speed be limited to what i can do in 3rd -- 132mph, or will it go faster if i shift into 4th (overdrive)-- 188mph? 132mph is plenty fast, just curious about what will happen when i change gear ratios.
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Posted on: 2010/9/26 0:52
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85 coupe, 383, TPIS Miniram, auto 700R4, 3.75 gears, afr 180 eliminator heads 58cc, 12:1 compression ratio, comp cams 280XFI hydraulic roller cam, 1.65 roller rockers, 52mm throttle body, c5 calipers, hedman elite longtube headers, pypes dual exhaust w/x- |
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| bogus | Re: top speed in D(3rd) or overdrive(4th)? | ||
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Grand Imperial Pooh-Bah
 
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IIRC, top speed was attained on OD. It's not so steep that the engine can't pull.
For reference, the ZF6 equipped cars got top speed in 5th. Oh, 188 is at best theoretical. I am betting on more like 145 or so, aero drag is a real bitch, yo. |
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Posted on: 2010/9/26 1:00
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| 383tpimachine | Re: top speed in D(3rd) or overdrive(4th)? | ||
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Master Guru
 
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Yes top is done in OD.
ZF6 and T56 are done in 5th and the T6060(ZR1 trans) is 6th due to closer ratio. Top speed in OD is VERY hard on parts tho |
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Posted on: 2010/9/26 1:08
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1985 Atomic Orange 400YSIT56-Racecar build 1970 El Camino-Awaiting LSX |
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| bogus | Re: top speed in D(3rd) or overdrive(4th)? | ||
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Grand Imperial Pooh-Bah
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Need to clarify, the T6060 is used in the NEW ZR1... the 4th gen ZR1 used the ZF6, indentical in all respects to the LT1/L98 ZF6 except for the input shaft. IIRC, it was a bit longer on the ZR1...
The 700R4 OD is .64:1, IIRC... In the ZF6, 5th is .76:1 and 6th is .51:1!! The T56 was nearly the same and the standard T6060 is nearly the same. The T6060 used in the ZR1 and Z06 are close ratio, and I don't know their specs off hand. |
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Posted on: 2010/9/26 2:38
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| 383tpimachine | Re: top speed in D(3rd) or overdrive(4th)? | ||
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Master Guru
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Sorry I did mean the C6ZR1 when talking about the TR6060.
700r4 OD is .70 200r4 OD is .68 IIRC T56 (MN6) 6th is .50 5th is .74 T56 (M28 or M29) 6th is .62 5th is .80 C5zo6 & GTO received these gears TR6060 6th is .57 5th is .84 |
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Posted on: 2010/9/26 3:00
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1985 Atomic Orange 400YSIT56-Racecar build 1970 El Camino-Awaiting LSX |
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| CentralCoaster | Re: top speed in D(3rd) or overdrive(4th)? | ||
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Senior Guru
 
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Depends on your rear end ratio, and where your motor makes peak HP.
Mine topped out in OD with the 4+3, 3.07 combo. 3rd gear is rpm-limited, the stock motor at least can't make power at that high an rpm. Stock will do at least 148mph, but you've got more power than that. My guess is you won't really care, it's not something you do more than a few times in your life, hopefully. Now with the 6-speed and 3.45, I actually lost some top speed, because there's a huge gap between 5th and 6th, and 5th is too short, 6th is too tall, neither see the right RPM to get the motor's peak HP. |
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Posted on: 2010/9/26 3:25
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1985 Z51, ZF6 |
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| pr0zac | Re: top speed in D(3rd) or overdrive(4th)? | ||
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Elite Guru
 
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i hit 150mph no problem in my stock 96 in 5th and had plenty to go just saw headlights.
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Posted on: 2010/9/26 5:27
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96 lt4. 357ci, 11:1, LE 226/232, LE2 LT4 heads, ported LT4 intake, EM Gladiator44, EM LT's, stock exhaust, NX kit. |
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