BRM 4.08 rearend swap now available!

[AZhitman]

I have just arranged for BRM to obtain a run of Q45 R200 rearends with Nissan 4.08 gears professionally swapped in and ready to bolt in.

I need 10 participants to get them for $850 each, and I'm gauging interest to see if it would be worthwhile for us to have them pre-built.

This would entail returning your core to BRM upon receipt of your freshly rebuilt 4.08 rearend...

For those of you that know the other cars well (240SX, 300Z, J30, etc), let me know if I need to extend this offer in any other forums.

[HeavyDuty]

Not a bad idea, good price. I'm assuming that is with new r&p, carrier bearings, pinion bearing (duh) & seal, 6 hole stubs & axle seals?

[rsiwicki]

I am interested...but I am a rooky when it comes to all this mod stuff. What exactly does the $850 include and will I need to make any other adjustments to the car??? Also how does this affect the speedo and if so can I get something that would recalibrate my speedo correctly? Sorry one other question....how much for installation in a local shop run for this sort of thing?...thanks rob

[maxnix]

Not a bad idea, good price. I'm assuming that is with new r&p, carrier bearings, pinion bearing (duh) & seal, 6 hole stubs & axle seals?

New speed sensor gear wheel would be necessary, also.

[nuQ]

hey greg, might be a good idea to give all the pros (and any cons) to a rear end swap. also, what is entailed in the removal and install. what kind of performance improvements can be expected???might sway some of us!!!jeff

[fxjackso]

In addition to HeavyDuty's list, would we get the LSD fluid replaced? I have heard that it wears out, so most of ours is. But with that ratio it would be even more critical, esp for those of us who don't have (and wouldn't necessarily want) TCS.

[AZhitman]

This would include new r&p, carrier bearings, pinion bearing and seal, axle seals. Keeps your original axle stubs. You add the fluid (shipped dry) and install.

Not sure what swapping it would cost, but it's a pretty straightforward job. Check billable hours at the local dealership and then take it to a corner garage - No different than any other car in this respect.

Brian is correct, new speed sensor gear would be an option to retain accurate speedo calibration. I'd recommend the 300ZX n/a part # as it was for a 4.08 (very close).

Performance improvements - Would obviously increase off-line torque by approx. 12% (if my math is correct). Great for stoplight-to-stoplight blasts, and would allow you to leave it in "D" instead of 3 when putzing around town.

Cons? Some impact to fuel economy. Also, Dennis has posited that a shift into 3rd would be required PRIOR to the end of a 1/4 mile run, whereas the stock setup allows the Q to go through the traps at the top of 2nd gear. 12% higher RPS at any given cruising speed, so 2500 becomes 2800.

NOTE: This all ASSUMES you're all running a tire that is 26.1" in overall diameter.

I'm sure Dennis will chime in here with more technical feedback soon.

[AZ94Q]

I'm sure someone will post that it slows down your 1/4 mile, however I don't believe this to be true...

Stillen, and countless people who have this mod have seen there ET's drop to low 14's.. In fact I've never heard from anyone who has this mod, that has said it slows down their 1/4 mile...

[AZhitman]

Well, if it makes anyone feel better, I'm already signed up for the first one!

And since it's MY $$$ on the line, I have to pay full price...

[maxnix]

This has to be the best way to increase off the line performance in terms of cost, reliability and risk of degrading longevity. It's straight forward and simple, but I would allow for a driveline balance, and maybe a new driveshaft, motor mounts, and transmission mounts if the car has 150K+ miles. Hell, get the exhaust hangers too.__________________Brian1995 Q45 & Q45t & 2000 Q45

Discover the power of the button!

[AZhitman]

I have all of the above.

[rsiwicki]

Hey AZhitman...I am really dead serious interested and it all sounds great. The only thing holding me back is the speedo calibartion. Can you tell me where to get the 300zx 3.08 thingy at? If you can supply me a setup where I can get the speedo correct (or close to correct) count me in :-)

[PalmerWMD]

Speedo calibration is said to be easy insytall of a cheap part.

This was done for my car by previous owner ( Dr Birkmeier) ) so This is just my hearsay,....

I like the Mod and have it on my 94, improves drivability.I run stock #'s in quarter, but that is more due to a faulty ECU that limits my top rpms to 6500.

A member of this board with JWT and 4.08/4.11 claims low 14's.Another source has claimed this same low 14's # but I have not been able to get anywhere near (again I am missing the last half grand or rpms on my car though).

I think on an early well ruynning Q w/ this and JWT mid 14's should be a realistic goal.

Fred..

[HeavyDuty]

Quote »I think on an early well ruynning Q w/ this and JWT mid 14's should be a realistic goal.

Fred.. [/quote]

Greg, I'm sure myself & other prospective buyers would pay the extra to have the speedo gear supplied too.

If the above numbers are accurate (and I've seen them posted here before), then a Precision Industries torque converter alongside the gears & JWT ECU, TCU might yield 13.9's. (Good driver, state of tune, perfect conditions, etc)

Then bring on the bottle, baby.

[Q45tech]

I guess all we could say is the 12% extra multipled RW torque should decrease the zero to 2nd gear redline [83 mph?] time by at least 0.3 seconds.

If that beats the gain of the JWT ecu is a wash - obviously both would be better...........but still you would have to shift at 87 mph before the quarter mile is over.

But most people drive in the real world, not drag strips where the sluggishness from 25-50 mph [because the transmission won't downshift to 1st] is very noticeable..............nothing but gearing changes will help here as the JWT ecu can't help much below 3500 rpm [47 mph in 2nd].

If your transmission takes 0.8 seconds to shift from 2nd to 3rd and you are only in 3rd [to complete the quarter] for 10 mph [2.0 seconds]........at most you will accelerate 0.1 -0.2 seconds faster.

Adding the 0.3 and the 0.2 [?] and subing the 0.8[for the shift] = minus 0.3 secs [add time to quarter]. At best it would be a wash.

For sure it would help the zero to 100 time and the 125 mph time

Maybe my math is wrong but

[rsiwicki]

Hey AZ....count me in if you can include the speedo thingy and I don't mind paying extra for the speedo thing. If you can't get the speedo thing, can you or someone else tell me exactly what I need (part#??) or where to get it. I'll be sending you an email to get the goods....

[AZhitman]

I will add the speedo gear part at cost (since you guys are so cool.)

Guess Joe's gonna be getting a bulk order.

[maxnix]

This one is a no-brainer with all changes and results known.

Engineering is straight forward, simple and empirical in nature, if the correct speed sensor gear is included. The only trick is balancing the driveshaft and differential assembly. But once again, the required procedure is known with the time required to achieve a particular degree of success being the only variable. A lot of security in knowing exactly what a project entails when there are no loose ends along the way to bite one's wallet.__________________Brian1995 Q45 & Q45t & 2000 Q45

Discover the power of the button!

[AZhitman]

The SC will happen. Don't dret.

At the very least, AZ will soon be home to the nation's 2 fastest Q's.

[Nismo_Freak]

The SC will happen. Don't dret.

At the very least, AZ will soon be home to the nation's 2 fastest Q's.

240 lbs. of nitrous says you're gonna have to try for that title

:icesangel

[AZhitman]

All I have to do is last longer than a 1/4 mile...

[Nismo_Freak]

All I have to do is last longer than a 1/4 mile...

Same here

[90Q45blue]

Heh. Why don't you race from coast to coast. Greg's car would win by a long shot (pun intended).

Nick

[Nismo_Freak]

Heh. Why don't you race from coast to coast. Greg's car would win by a long shot (pun intended).

Nick

This is the Project Q your talking about... you don't know how ghetto we are gonna get

[1qckser]

Quote »This is the Project Q your talking about... you don't know how ghetto we are gonna get [/quote]

Maybe we will be able to use some of your findings, a lil juice never hurt nothin.

[dgoodno]

:ylsuper :ylsuper :ylsuper

AZ. I'm a maybe. I got an email back from Tony after I let him know of your buy. He says he'll get on and read the thread as soon as he can break away from those pesky cars that he's fixing.

What do you see as your timeline? I have the car in pieces and have put it back together soon. What's your count on definites and maybes?

[AZhitman]

So far, and correct me if I'm wrong, looks like myslef, Rob, HD, duaine and Alan are a go.

I'm thinking I should be ready to pull the trigger on the first one in a month. We need to secure at least one or two rearends to begin with, and we'll sell that one to the first buyer. Then the core will be turned in and regeared for the next buyer, and so on.

[rsiwicki]

There is a rear end gear on ebay off that 94 Q45 that is being parted out. I would be willing to bid on it and have it shipped directly to the BRM guys to get the chain started if you all think this is an option??? And we would not have any down time to the cars.....Hitman, just email me and let me know what you think and I'll get the bidding underway(up to a reasonable amount)....Cost is about $50 + $65 shipping (providing nobody else bid's on it)....We can work out the differences in monies later after we get this chain started and our cars moving faster

http://cgi.ebay.com/ebaymotors...17101

[rsiwicki]

Here are 2 cool gear / mph calculator that calculate the change in rpm with running a different gear and your true mph....

http://www.4lo.com/calc/gearratio.htm (this one does the rear gear calcs)

http://www.4lo.com/calc/gearmetric.htm (this one is for tires contact patch calculator)

I have no idea what they are asking for (I am a rooky), but maybe Q45tech can tell us (me) how it works and fill in the blanks on what info they are asking for

[AZhitman]

AZ, Can you try to get BRM to make a strut tower brace available? I don't want to order through Stillen, and I don't want to go trough the process of buying a maxima/i30 one and retro fitting it. I'm sure there would be good demand for an affordable strut tower brace, from our home tuner shop

I would if I could get a supplier for the bar itself - it needs to be aluminum, adjustable and have nice Heim joints...

If someone can find out where the Maxima ebay sellers get their bars, I'd consider pulling the feet off my FSTB for replication by our welding gurus at BRM. However, it will SUCK driving without it!