Would anyone with a 95-2k1 5spd be iterested in shorter gear ratios?
02-05-2003, 12:33 PM
#41
Senior Member
Join Date: Mar 2002
Posts: 317
Originally posted by Dave B
On my lunch break I went and tested out 5th. At 85mph, I was right at about 3350rpms. That's not bad at all.
Neal,
I guess a 4.33 is the only way to go with the MEVI and JWT
Dave
On my lunch break I went and tested out 5th. At 85mph, I was right at about 3350rpms. That's not bad at all.
Neal,
I guess a 4.33 is the only way to go with the MEVI and JWT
Dave
Neal may be right about the maxima's gearing. One must compare the rpms/engine 'sweet' spot on dyno charts to see if the shifts are optimized to use the maxi's powerband.
I'm surprised cartest said a 4.10 ratio would only improve times by .05 sec, though.
02-06-2003, 07:12 AM
#42
Originally posted by Nealoc187
I'm surprised Steve or Ari haven't plugged this into cartest yet
Anyhow, I did. The results are negligable. I used my car for reference, which I have accurately modeled in cartest to .01 of a second, using my real WHP numbers, etc. Changing the ratios from stock to Altima gear ratios yeilded a .01 gain in 1/4 mile in every stage of modification, stock, ypipe/intake, MEVI ypipe and intake, even with the hypothetical numbers my JWT ECU will give. Trap speeds were unchanged down to 1/100th of 1mph. Top speed however changed nicely, up 3mph in almost every test except the MEVI+ECU car which was unchanged.
Gains to other spees were negligable also. On average the car with STOCK gearing got to 140mph a full second faster than the car with Altima gearing, though the top speed of the Altima geared car was higher.
I also took the liberty of changing the final drive ratios to the suggested 4.10 rather than the stock 3.82. 1/4 mile ETs improved about .05 seconds, though trap speeds suffered about .5-.75mph. Top speeds were lowered.
So, the stock gear ratios are pretty much ideal, changing them is definately not worth the effort unless you crave that extra 3mph top
speed.
I'm surprised Steve or Ari haven't plugged this into cartest yet
Anyhow, I did. The results are negligable. I used my car for reference, which I have accurately modeled in cartest to .01 of a second, using my real WHP numbers, etc. Changing the ratios from stock to Altima gear ratios yeilded a .01 gain in 1/4 mile in every stage of modification, stock, ypipe/intake, MEVI ypipe and intake, even with the hypothetical numbers my JWT ECU will give. Trap speeds were unchanged down to 1/100th of 1mph. Top speed however changed nicely, up 3mph in almost every test except the MEVI+ECU car which was unchanged.
Gains to other spees were negligable also. On average the car with STOCK gearing got to 140mph a full second faster than the car with Altima gearing, though the top speed of the Altima geared car was higher.
I also took the liberty of changing the final drive ratios to the suggested 4.10 rather than the stock 3.82. 1/4 mile ETs improved about .05 seconds, though trap speeds suffered about .5-.75mph. Top speeds were lowered.
So, the stock gear ratios are pretty much ideal, changing them is definately not worth the effort unless you crave that extra 3mph top
speed.
3.5L 2003
3.153 1st
1.944 2nd
1.392 3rd
1.055 4th
0.809 5th
0.630 6th
3.002 Reverse
3.812 Final
Thanx...
02-06-2003, 08:06 AM
#43
Dyno plot says I have the most area under the Administrator curve
Join Date: Jul 2001
Posts: 7,060
The final drive on the new 6spd is like 4.133 or something, to account for the larger diameter of the tires. Otherwise the ratios are pretty much identical to the G5 6spd.
Originally posted by MAXIN
Interesting... could you do a cartest with the 6-speed transplanted into the 4th Gen 5-speed? Since Maximus is also working on that.
3.5L 2003
3.153 1st
1.944 2nd
1.392 3rd
1.055 4th
0.809 5th
0.630 6th
3.002 Reverse
3.812 Final
Thanx...
Interesting... could you do a cartest with the 6-speed transplanted into the 4th Gen 5-speed? Since Maximus is also working on that.
3.5L 2003
3.153 1st
1.944 2nd
1.392 3rd
1.055 4th
0.809 5th
0.630 6th
3.002 Reverse
3.812 Final
Thanx...
02-07-2003, 05:57 PM
#45
Originally posted by CKNY
jeff, get the 6 speed transplant working =) you KNOW you want to hahaha
jeff, get the 6 speed transplant working =) you KNOW you want to hahaha
The taller 1st and shorter 2nd of the 6spd will be much better for s/c cars to keep the rev's in the boost range during shifts. I'm hoping to see some much better times.
02-07-2003, 11:41 PM
#46
Not DAVEB the parts guy
Join Date: Aug 2000
Posts: 8,555
Originally posted by maximus75
It'll been done soon. BTW, nice sig Chris The taller 1st and shorter 2nd of the 6spd will be much better for s/c cars to keep the rev's in the boost range during shifts. I'm hoping to see some much better times.
It'll been done soon. BTW, nice sig Chris
The taller 1st and shorter 2nd of the 6spd will be much better for s/c cars to keep the rev's in the boost range during shifts. I'm hoping to see some much better times.
Dave
02-08-2003, 02:08 PM
#48
Originally posted by Dave B
May I ask how? The 6 speed bellhousing and linkage is completely different.
Dave
May I ask how? The 6 speed bellhousing and linkage is completely different.
Dave
02-08-2003, 06:33 PM
#49
Dyno plot says I have the most area under the Administrator curve
Join Date: Jul 2001
Posts: 7,060
Originally posted by Nealoc187
I'm surprised Steve or Ari haven't plugged this into cartest yet
I'm surprised Steve or Ari haven't plugged this into cartest yet
Finally sent an email to Pat Glenn (guy who wrote it) about my issue so hopefully he'll get back to me pretty fast. I'm going through CarTest withdrawl!
02-13-2003, 11:57 AM
#51
Dyno plot says I have the most area under the Administrator curve
Join Date: Jul 2001
Posts: 7,060
Originally posted by hlh0501
does anyone know approx what rpm you would be at with altima tranny at 75mph? and also what the new top speed (assuming you have the power to wind out the gear) would be, or is it same?
does anyone know approx what rpm you would be at with altima tranny at 75mph? and also what the new top speed (assuming you have the power to wind out the gear) would be, or is it same?
02-13-2003, 02:41 PM
#52
Originally posted by 97maximase5spd
If 5th gear was significantly taller, I would hate it. I can imagine cruising at 60mph at 1900 rpms and having very very little passing power. I like the way the rpms are now. I feel good that I can drive on the highway in the tallest gear and still be able to accelerate to pass someone. It would be more of a pain to have to downshift to 4th or 3rd everytime I wanted to go. Does anyone else feel this way or is it just me?
If 5th gear was significantly taller, I would hate it. I can imagine cruising at 60mph at 1900 rpms and having very very little passing power. I like the way the rpms are now. I feel good that I can drive on the highway in the tallest gear and still be able to accelerate to pass someone. It would be more of a pain to have to downshift to 4th or 3rd everytime I wanted to go. Does anyone else feel this way or is it just me?
02-13-2003, 07:16 PM
#53
Originally posted by Dave B
The 95-01 Maximas come with 3.823 gears already close to ideal, but a 4.10 would be perfect assuming you could handle cruising at 70mph at 3200rpms. I could. Look at the 95-01 M3s, they cruise at 3500rpms at 70mph. I believe they have 4.20 gears.
Dave [/B]
The 95-01 Maximas come with 3.823 gears already close to ideal, but a 4.10 would be perfect assuming you could handle cruising at 70mph at 3200rpms. I could. Look at the 95-01 M3s, they cruise at 3500rpms at 70mph. I believe they have 4.20 gears.
Dave [/B]
Actually the E36 M3's only had a 3.15 gears for 1995 and 3.27 gears for 1996-1995.
02-13-2003, 07:52 PM
#54
Senior Member
Join Date: Aug 2000
Posts: 2,807
I just ran the results of the 6spd in a 4th gen with USIM + bolt ons vs MEVI + bolt ons. In the end acceleration times are identical, there is a 0.04 difference in favor of the 6spd for the USIM but there is a -0.04 delta with the 6spd for MEVI. The only benefit outside of fuel economy is that it raises the USIM's trapspeed in the 1/4. Now the car is finishing around 5200-5400rpm so that is right at the power peak. Also it appears that the USIM's topspeed is increased to 145mph vs 141mph with stock gearing. The MEVI's topspeed is the same with either tranny. Also the 6spd hurts the trapspeed for the MEVI by forcing a 3-4 shift and since it finishes around 5400rpm in 4th there isn't much gain.
Verdict: For a NA car it isn't worth the trouble, unless you really want more highway fuel economy.
Now I've also compared the tranny's with n2o and boosted too. For n2o car I used Sx7r's old dyno, the SC I used Mardi's 14psi dyno and the turbo I used Nigel's 11psi dyno. The end result is other than increased topspeed there isn't any significant gain. All ETs are about 0.03 of each other minus the turbo car. Again other than getting more mpg on the highway there isn't much to gain from the swap. In 6th gear the engine is turning ~2000rpm @ 60mph. If I'm not mistaken that is pretty much the same gear ratio as the auto in 4th with TC locked.
Verdict: Stock gear ratios have been proven to be the optimal setup for NA, n2o and boosted cars that don't drive over 155mph.
Verdict: For a NA car it isn't worth the trouble, unless you really want more highway fuel economy.
Now I've also compared the tranny's with n2o and boosted too. For n2o car I used Sx7r's old dyno, the SC I used Mardi's 14psi dyno and the turbo I used Nigel's 11psi dyno. The end result is other than increased topspeed there isn't any significant gain. All ETs are about 0.03 of each other minus the turbo car. Again other than getting more mpg on the highway there isn't much to gain from the swap. In 6th gear the engine is turning ~2000rpm @ 60mph. If I'm not mistaken that is pretty much the same gear ratio as the auto in 4th with TC locked.
Verdict: Stock gear ratios have been proven to be the optimal setup for NA, n2o and boosted cars that don't drive over 155mph.
Originally posted by Nealoc187
I'm surprised Steve or Ari haven't plugged this into cartest yet
I'm surprised Steve or Ari haven't plugged this into cartest yet
02-13-2003, 09:23 PM
#55
Dyno plot says I have the most area under the Administrator curve
Join Date: Jul 2001
Posts: 7,060
Originally posted by Nismo87SE
Verdict: Stock gear ratios have been proven to be the optimal setup for NA, n2o and boosted cars that don't drive over 155mph.
Verdict: Stock gear ratios have been proven to be the optimal setup for NA, n2o and boosted cars that don't drive over 155mph.
Thread
Thread Starter
Forum
Replies
Last Post
CAN-Toronto FS: Basement cleaning
knight_yyz
5th Generation Classifieds (2000-2003)
12
11-01-2015 01:34 PM