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Hello, I have an awd Honda civic with a D16z6 fully built turbo engine.
The drivetrain is from a honda wagovan RTAWD.
The car is only for on the dirt track (no Tarmac)
We have 330whp and 400Nm torque
1.1 bar turbopressure.
The revs for the launsch control is adjustable by turning-****.
We already changed the ratio from the RTAWD gearbox to make it closer.
Question:
Are there reinforced custom parts available for the RTAWD L3-gearbox?
How much power can the original gearbox handle?
Are there reinforced custom parts available for the a CRV-gearbox?
How much power can a CRV-gearbox handle.?
Which type of CRV-gearbox is the best to use?
I appriciate every information that's available on these gearboxes!!
Hate to be the first to say it, but you have picked the worst transmission to work with. Nobody makes anything for those transmission, nothing, can't even find oem parts anymore.
I don't know how strong the CRV's transmissions are, but it shares internals with the h22/f22 transmissions.
(The gearbox is built in so I don't have the opportunity right now to count the teeth, sorry.)
I already have driven the civic, with 285whp an dit about 30 launches in the dirt at 4300 rpm.
We have changed the gear ratio (custom 3th gear and original 3th on the position of the original 4th.), so that's already don it's much closer now.
If this wagovan gearbox breaks i will go look for a CRV- gearbox.
I think I'll keep the wagovan rear diff en VC, in combination with a CRV- gearbox or not?
Which year of manufacture/ type CRV-gearbox should I look for?
I have to get a adapter plate too mount it against the D16Z6 or not?
Are these available?
Because I want to use this fully built D16z6 Turbo engine with external anti-lag valve
Are there stronger gears available for the CRV- Gearbox?
Are there shorter ratio available?
If you are talking about an actual CRV transmission and not some Euro-slang then the answer is unclear as most don't modify them very much. The CRV trans has pretty close gear ratios from factory and a very short 1st gear. You can get them plated and get carbon synchros and such but aside from a custom LSD your options are are limited. The main problem is the dual ring gear. People have swapped LS 5th gears onto them, but that doesn't help you.
The best years (IIRC) would be '99 - '01 as they changed the transfer case design a bit. The CRV trans obviously has a B-series bell housing. You would need a conversion kit to make it easy. There are a few different ones out there. Even people saying "you don't need an adapter plate" but you still need special parts LOL.
A little searching goes a long way, but most would argue a stock H22 trans can support between 450 - 600 whp without modification. The weak link is the transfer case since you already have worked out the real problem areas.
You will not need the custom flywheel/expensive clutch.
It's possible to use the original D-series flywheel/clutch for D2B setups with this disc: D2B clutch disc
The size fits the D flywheel/clutch, while it has the same spline setup as the B trans.
You will still need to modify the engine mounts a bit, but you do not have to buy expensive kits, so you can save about $3-400
The wagon rear diff and the crv trans are maybe not compatible.
Count the teeth on the final drive/transfer gear and on the diff, and we will see
I think the CRV/HRV/93- RTSI, the wagon/non-abs -92 RTSI, and the Intrac RTSI (-92, abs) are using different front/rear ratios, but I also think that neither of them are 1:1, so there's a chance. Count the teeth in the final drive/transfer case, and in the diff.
If he is going for reliability, hacking it shouldn't be an option and why I opted to not post those links. There have been a few people that have used the CRV trans and Wagovan rear differential. One of the more well known one is EpicTuning's Civic:
If he is going for reliability, hacking it shouldn't be an option and why I opted to not post those links. There have been a few people that have used the CRV trans and Wagovan rear differential. One of the more well known one is EpicTuning's Civic:
Sorry, I tried to search for the speedfactory D2B build, but found the wrong DIY D2B thread, yes, the devcon way is a bit less reliable.
Check the speedfactory ~600hp build.
He doesn't use an adapter plate, and he's using TIG-welding instead of devcon. It seems more reliable this way
Going D2B (especially without an adapter plate) also helps the weight distribution a bit
(the trans is heavier, and the engine have to be moved 1" closer to passenger side).
As you will have to make custom mounts, it's maybe a good time to move the engine backwards a bit, too.
The clutch disc I recommended, is an S2000 disk, but it could be used instead of a custom flywheel/multiplate clutch.
It's good for 475 ft lbs, so it should be enough I guess
The transfer case. As with anything, it can be improved if you have enough money. At that point though it wouldn't cost much more to just switch to an aftermarket trans.
The transfer case. As with anything, it can be improved if you have enough money. At that point though it wouldn't cost much more to just switch to an aftermarket trans.
How much power do you think that the CRV-transfer case can handle?
now the car has 330 whp and about 400Nm torque thats about 295ft lbs.
Do not forget that the CRV rear end has different gear ratios then the wagon diff,
it could cause an issue. Some solve it by using different tire size in the front/rear.
I think if you going to modify the trans anyway, to fit the D block, so while you are there, you could do some extra tig welding on the diff area/transfer case area.
That's definitely nice, but that isn't the weakest spot (plus that doesn't look like a AWD trans). Every failure I have seen has been from the transfer case exploding no different than when your typical RWD ring and pinion explodes. It's the nature of the hypoid gearset - the gears want to go opposite directions. Sometimes when they explode they take out the transmission case. The transfer case is definitely the weaker of the two by far.
Ditch the Wagovan trans. The design on it is horrible and no replacement parts are available.
Keep the Wagovan rearend.
You don't need an adaptor plate for the trans, just a clutch and flywheel. The trans obviously will need to be modified to fit onto the D block.
There are actually quite a few options for the CRV transmission (gears, synchros, etc), though none address the FD or transfer case.
I have found some synchros for the CRV-gearbox but i can not find gears?
Yesterday I sent an email to synchrotech, to ask them for parts for these CRV-trannys.
He (James) told me that no one makes custom gears for the CRV-tranny. Also would it be very hard to shift gears in high revs. even with new parts?
What are high revs?
I have the rev. limeter on 6500-7000rpm i don't think thats high. The gears could be faceplated, to shift better?
There are actually quite a few options for the CRV transmission (gears, synchros, etc)
I missed this. This is news to me as well. I have talked to many Honda transmission "specialists" and never heard of gears aside from face plating and 5th gear swap. For synchros or upgrade kits you just use the Euro H22 parts.
I missed this. This is news to me as well. I have talked to many Honda transmission "specialists" and never heard of gears aside from face plating and 5th gear swap. For synchros or upgrade kits you just use the Euro H22 parts.
You could use parts from H22 trans in the crv 4wd?
What parts are interchangeable?
Same part numbers, or they just fit?
03-08-2015, 01:49 AM
REINFORCED CUSTOM PARTS RTAWD & CRV GEARBOX
, 475 ft lbs that's about 644Nm, more than enough!!
