7AT 3.692 Gear Review

1slow370 · 11-17-2013, 07:17 PM

Its hard to say all i can tell you is it thinks the front wheels are turning faster than the rear wheels by 2 teeth per rev. Its hard to say exactly how the abs and tc are going to react.

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critical · 11-17-2013, 08:08 PM

ABS works fine. Just slam on the brakes to see lol.

Cruise control doesn't work, but I think if I clear random O2 sensor codes (complexly unrelated) TC will work. Not bothered to figure out why or if this is the case since I never use it.

1slow370 · 11-18-2013, 12:55 AM

Quote:

Originally Posted by critical

ABS works fine. Just slam on the brakes to see lol.

Cruise control doesn't work, but I think if I clear random O2 sensor codes (complexly unrelated) TC will work. Not bothered to figure out why or if this is the case since I never use it.

I think he is saying he just swapped a 350z pumpkin in without changing the stub shafts which is going to be 2 teeth off per rev since the 350z's had different stubs

Edit: or wait he owns a 350 so maybe he used a 370 rear in a 350 so it would be off the other way.

andre12031948 · 11-18-2013, 05:56 AM

Quote:

Originally Posted by 1slow370

I think he is saying he just swapped a 350z pumpkin in without changing the stub shafts which is going to be 2 teeth off per rev since the 350z's had different stubs

Edit: or wait he owns a 350 so maybe he used a 370 rear in a 350 so it would be off the other way.

I put a 370's pumpkin into my 350 because it had 4:08 gears. No problem doing it & the mechanic (dealer) didn't mention anything.

I took my 350 pumpkin with 3:90 gears & installed it in my 370. During installation a different mechanic pointed out to me that those rings were spaced a bit different. Since my 370z pumpkin was out already, I gave permission to make the change and see what happens. Result, no abs light but no cruise control. Had no issues with 370 pumpkin into my 350z car.

A day later

I drove 3 hours to a track(Atco) just to see/feel the results. Had the car for only 3/4 days, so everything else was completely untouched.

Even with traction problems(water on track) the car pulled like a MF & of course went through the gears really fast. After it (auto left in D) shifted into 2nd. the car was really moving. MPH as high as 107 almost 108. I think that's great pulling power for a stock Z w 1,500 miles. Test pipes + tune 110+ mph ???? Will test the abs after it snows a bit

esfourteen · 11-19-2013, 10:19 PM

the manual 350z has a 3.53 final drive, the 370 has a 3.69. small difference, but worth pointing out

visconti · 11-28-2013, 10:44 AM

Quote:

Originally Posted by blueranger

Thanks for the review

I heard EcuTek Tune can get your Cruise Control back with this Mod.

Yes EcuTek can get your CC back

Let me know when your ready !

Sent from my iPhone using Tapatalk

Felix 808 · 11-28-2013, 01:49 PM

Quote:

Originally Posted by critical

the 3.692 final drive gear with the auto transmission is comparable to a manual with the 4.08 final drive gear. Actually i'm geared higher, minus 5th gear.

Actually you are geared lower. Higher Ratio #'s = lower gears. Pinion gear gets smaller on numerically higher gear sets

Quote:

Originally Posted by critical

not much to say here other than it's awesome. Have a 3.692 final drive gear and a quaife differential and it accelerates so nicely. Car is always in the power band it seems and is much more pleasant to drive around. Fuel consumption is not really affected. I averaged 24 ish on a road trip with some pretty fast driving. In 7th gear i'm at around 3k rpm's at 80mph.

I'm glad I re-read this post, as I was looking into 3.9's for my auto as 4.08's would be too deep for me. After recalculating, there is only 4% difference between the 3.692 & the 3.9's. For the added cost I'm going to go with the 3.692's as they will already be in the low mileage diff I just bought Thanks for saving me a grip of cash

Quote:

Originally Posted by critical

Only negative is that cruise control does not work now. Actually it works intermittently.
The 3.692 final drive gear with the auto transmission is comparable to a manual with the 4.08 final drive gear. Actually I'm geared higher, minus 5th gear.

Does anyone have a clear understanding on how the cruise control works in the 370z? Where is it sensing it's reading from? Also is there any speedo/ Odo correction available/ needed?

Thanks again

Felix 808 · 11-28-2013, 01:55 PM

Quote:

Originally Posted by esfourteen

the manual 350z has a 3.53 final drive, the 370 has a 3.69. small difference, but worth pointing out

That's 1/2 of the gain right there. 3.53 is only 5% increase while 3.692 is right at about 10% increase. Thanks for pointing that out:

andre12031948 · 11-28-2013, 03:10 PM

If I didn't have my 3:90 gear pumpkin laying around, I would have installed a stock 370z 3:69 gear pumpkin. My car shifted into 5th gear before the end of the 1/4 mile, so the 3:69 gears set up would be perfect/ideal & easy to find & install.

I will make my 3:90 work by tuning & raising the high H.P. point to 7,500 rpm & shifting points apx. 200 rpm. to 7,700 rpm with a redline at 7,800 rpm. It should do very well at the track. Test pipes, maybe better tires plus^^^^^that will put me into the 12.7's/12.8's with stock intakes & stock mufflers. Also it's real fine as a daily street car.

critical · 11-28-2013, 03:40 PM

Quote:

Originally Posted by Felix 808

Actually you are geared lower. Higher Ratio #'s = lower gears. Pinion gear gets smaller on numerically higher gear sets

I'm glad I re-read this post, as I was looking into 3.9's for my auto as 4.08's would be too deep for me. After recalculating, there is only 4% difference between the 3.692 & the 3.9's. For the added cost I'm going to go with the 3.692's as they will already be in the low mileage diff I just bought Thanks for saving me a grip of cash

Does anyone have a clear understanding on how the cruise control works in the 370z? Where is it sensing it's reading from? Also is there any speedo/ Odo correction available/ needed?

Thanks again

it messes with the cruise control logic. the specifics are on the forum somewhere and possibly in the service manual as well.

blueranger · 01-19-2014, 09:12 PM

Anyone know other sources besides eBay for a used manual rear diff?

I have been looking for a couple of months on eBay with no luck

critical · 01-19-2014, 10:39 PM

bug all the boosted Z owners

Felix 808 · 01-19-2014, 11:43 PM

You can always call around to junk yards, both local & on the internet. I'll keep an eye out for you

megalapagas · 01-22-2014, 08:54 PM

Soo just to be on the clear quaife only delivers through one tire while the other rear tire is just dangling not puting power down?? Sorry this whole thing of diff and gears scrambles my head hahahahahaha. So you can get a basis my car is a DD, No track, Ocasional Drag. Also I plan on doing it on a 350Z Diff manual base model to my 370z. I plan on doing the 4.08 gears and just for the benifit of the doubt 4.08 gears are shorter or longer???? Since I plan on adding a big punch to this combo.

blueranger · 01-23-2014, 12:30 AM

Quote:

Originally Posted by Felix 808

You can always call around to junk yards, both local & on the internet. I'll keep an eye out for you

You are a cool cat

11-17-2013, 07:17 PM	#16 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	Its hard to say all i can tell you is it thinks the front wheels are turning faster than the rear wheels by 2 teeth per rev. Its hard to say exactly how the abs and tc are going to react. Sent from my HTCONE using Tapatalk __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

11-17-2013, 08:08 PM	#17 (permalink)
critical A True Z Fanatic Join Date: Oct 2012 Location: Washington Posts: 1,252 Drives: 09' 370z 7AT Rep Power: 16	ABS works fine. Just slam on the brakes to see lol. Cruise control doesn't work, but I think if I clear random O2 sensor codes (complexly unrelated) TC will work. Not bothered to figure out why or if this is the case since I never use it. __________________ Quaife w/ gears \|Stillen Gen 3\|SOLD FI Resonated Test Pipes \|SOLD FI 18'' \| 25row Stillen Race \| Progress 35mm/25mm sways \| Swifts/Koni\|Volk G25's\| Stoptech SS lines\|\|SPL Front/Rear Arms\|

11-19-2013, 10:19 PM	#20 (permalink)
esfourteen A True Z Fanatic Join Date: Mar 2010 Location: LI, NY Posts: 1,375 Drives: 40th TT Rep Power: 18	the manual 350z has a 3.53 final drive, the 370 has a 3.69. small difference, but worth pointing out Felix 808 likes this. __________________ Build Thread \| GTM TT Install Thread \| Engine Build Thread

01-19-2014, 09:12 PM	#26 (permalink)
blueranger Track Member Join Date: Aug 2012 Location: Albuquerque NM Posts: 577 Drives: 2010 Roadster 7AT Rep Power: 307	Anyone know other sources besides eBay for a used manual rear diff? I have been looking for a couple of months on eBay with no luck __________________ F.I. Stage 1 Twin Turbo #48 \| E85 FlexFuel \| Built 7AT \| F.I. 34 Row Oil Cooler \| F.I. Flex Plate \| F.I. 19 row Trans Cooler \| MT ET Street S/S \| ECUTEK Tuned by Seb \| RPM Roll Bar

01-19-2014, 10:39 PM	#27 (permalink)
critical A True Z Fanatic Join Date: Oct 2012 Location: Washington Posts: 1,252 Drives: 09' 370z 7AT Rep Power: 16	bug all the boosted Z owners __________________ Quaife w/ gears \|Stillen Gen 3\|SOLD FI Resonated Test Pipes \|SOLD FI 18'' \| 25row Stillen Race \| Progress 35mm/25mm sways \| Swifts/Koni\|Volk G25's\| Stoptech SS lines\|\|SPL Front/Rear Arms\|

11-28-2013, 03:10 PM	#24 (permalink)
andre12031948 Banned Join Date: Feb 2011 Location: monticello new york 127 Posts: 1,095 Drives: 08 350z black 6m/t Rep Power: 0	If I didn't have my 3:90 gear pumpkin laying around, I would have installed a stock 370z 3:69 gear pumpkin. My car shifted into 5th gear before the end of the 1/4 mile, so the 3:69 gears set up would be perfect/ideal & easy to find & install. I will make my 3:90 work by tuning & raising the high H.P. point to 7,500 rpm & shifting points apx. 200 rpm. to 7,700 rpm with a redline at 7,800 rpm. It should do very well at the track. Test pipes, maybe better tires plus^^^^^that will put me into the 12.7's/12.8's with stock intakes & stock mufflers. Also it's real fine as a daily street car.

01-19-2014, 11:43 PM	#28 (permalink)
Felix 808 A True Z Fanatic Join Date: Oct 2011 Location: Camarillo, CA Posts: 1,063 Drives: 2011 PW/Grey T/S 7AT Rep Power: 2807	You can always call around to junk yards, both local & on the internet. I'll keep an eye out for you blueranger likes this. __________________ Semper Fi Μολὼν λαβέ

01-22-2014, 08:54 PM	#29 (permalink)
megalapagas Enthusiast Member Join Date: May 2013 Location: McAllen,TX Posts: 457 Drives: '10 370Z Tour A/T Rep Power: 12	Soo just to be on the clear quaife only delivers through one tire while the other rear tire is just dangling not puting power down?? Sorry this whole thing of diff and gears scrambles my head hahahahahaha. So you can get a basis my car is a DD, No track, Ocasional Drag. Also I plan on doing it on a 350Z Diff manual base model to my 370z. I plan on doing the 4.08 gears and just for the benifit of the doubt 4.08 gears are shorter or longer???? Since I plan on adding a big punch to this combo. __________________ GTM 34 Row Oil Cooler \| K&N Drop Ins w/ Z1's Post MAF Tubes \| F.I Non-Res'd 2.5" T.P w/ CF CBE \| Axis Wheels \| Piecing together My Own Custom T4 Top Mount Single Turbo Kit Still in the works \| Last edited by megalapagas; 01-22-2014 at 08:58 PM.

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