I didn't know a 4.9 final even fit in the case, I thought the exospeed 4.73 was the largest.
Building the Uber-transmission
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Sheesh.... that is going to be one stout tranny.... Ill bet that thing bolted to even an hf would produce a litle neck snap.. . 
Chris
Chris
Keep us posted and updated. If you don't mind my asking, what are those SRR final ratios selling for?
That certainly DOES sound like an uber-tranny. We've been tracking down and putting together parts for our own "superHybrid" for a while now - the 4.43 final isn't that easy to get hold of if you're not near the importers, where you can check things out and verify the ratios before you buy... I *did* get lucky in the last bunch of ZC transmissions we bought, though - one of the ones they sent us has a KAAZ limited-slip diff in it! David and I are still kind of fighting over it; I want it for my '91 DX - I want to replace the hybrid transmission I've got (ZC 1-4, HF 5, Si FD/Diff) with the new Super (ZC 1-4, HF 5, 4.43 FD, LSD, and intermediate shaft to calm down the torque-steer). David wants Effin to use that one in an unspecified "future project car". I'm kind of at the point where I don't really WANT any more project cars until I finish at least a couple of the ones I've got!
But seeing as that future project is being thought about as an autocross/track-only car, the 4.9 FD starts looking pretty sweet. Close gears and an ultra-quick final could make it go through the gears like a sportbike!
If you haven't driven a hybrid transmission with the HF 5th gear yet, try one before you commit. I love it, but there IS a pretty good drop in revs on the 4-5 upshift. It's fine for me, because I tend to use fifth more as just an overdrive or highway gear, not for accelerating. If I still need to have it floored by the time I'm shifting into 5th, the cops have already radioed ahead!
Mike
That certainly DOES sound like an uber-tranny. We've been tracking down and putting together parts for our own "superHybrid" for a while now - the 4.43 final isn't that easy to get hold of if you're not near the importers, where you can check things out and verify the ratios before you buy... I *did* get lucky in the last bunch of ZC transmissions we bought, though - one of the ones they sent us has a KAAZ limited-slip diff in it! David and I are still kind of fighting over it; I want it for my '91 DX - I want to replace the hybrid transmission I've got (ZC 1-4, HF 5, Si FD/Diff) with the new Super (ZC 1-4, HF 5, 4.43 FD, LSD, and intermediate shaft to calm down the torque-steer). David wants Effin to use that one in an unspecified "future project car". I'm kind of at the point where I don't really WANT any more project cars until I finish at least a couple of the ones I've got!
But seeing as that future project is being thought about as an autocross/track-only car, the 4.9 FD starts looking pretty sweet. Close gears and an ultra-quick final could make it go through the gears like a sportbike!
If you haven't driven a hybrid transmission with the HF 5th gear yet, try one before you commit. I love it, but there IS a pretty good drop in revs on the 4-5 upshift. It's fine for me, because I tend to use fifth more as just an overdrive or highway gear, not for accelerating. If I still need to have it floored by the time I'm shifting into 5th, the cops have already radioed ahead!
Mike
I love my hybrid tranny that has that setup. The 4th to 5th really isn't that bad and it sure makes highway cruising pleasant. Even at 90 mph or better the engine isn't really straining.Kwicko said:If you haven't driven a hybrid transmission with the HF 5th gear yet, try one before you commit. I love it, but there IS a pretty good drop in revs on the 4-5 upshift. It's fine for me, because I tend to use fifth more as just an overdrive or highway gear, not for accelerating. If I still need to have it floored by the time I'm shifting into 5th, the cops have already radioed ahead!
Mike
I go by the flow of traffic more than anything else. There's always some teen hauling ass around here. If not, then I do go by the engine sound/tach. I really don't look at the speed at all. That's why I will look down on a long trip and think, "Wow, 95 mph. Didn't realize I was going that fast."
I don't have a radar detector as I still got tickets with it. Since getting rid of it several years ago I have only received one which was dismissed after deferred adjudication. My record is still clean at this point. (knock on wood)
Kwicko is right, that HF 5th sure allows for a fast cruise. And the ZC 1-4 paired with ths Si final has a habit of encouraging jack rabbit starts. So I guess it is just plain difficult to granny drive with the hybrid.
I don't have a radar detector as I still got tickets with it. Since getting rid of it several years ago I have only received one which was dismissed after deferred adjudication. My record is still clean at this point. (knock on wood)
Kwicko is right, that HF 5th sure allows for a fast cruise. And the ZC 1-4 paired with ths Si final has a habit of encouraging jack rabbit starts.
So I guess it is just plain difficult to granny drive with the hybrid.Whew - I was starting to wonder if it was just me! Akira, you're right - 4000rpm just feels like the perfect sweet-spot for the CRX engine. The HF 5th doesn't change that sweet spot - just the speed at which it's maintained! 4000 still feels like the right spot for a highway cruise. It's weird - I went with the HF 5th because I wanted my revs to be a little lower on the highway; I figured since I always tend to cruise at around 80mph, then the HF overdrive would drop my revs to around 3600rpm at that speed (it does, but closer to 3700rpm). Instead of cruising at 3600-3700rpm, though, I still end up at 4000rpm - because that's where the ENGINE speed wants to be, regardless of my wheel speed!
Guess maybe the car knows more about what makes it happy than I do...
Mike
Guess maybe the car knows more about what makes it happy than I do...
Mike
Akira: Makes me want a ZC... My A6 engine mated to the HF 5th gear does a bit of an odd thing: it gets up on the cam up at around 4500rpm - which is around 105mph! It's a weird thing - you're accelerating, but just smoothly, easing up the speed, and then you can feel it start pulling stronger and stronger. I don't know where it runs out; I've chickened out around 115-118 mph indicated every time I've tried it. I'd love to find out where the air drag overcomes the "awesome" power of the Si engine, but I'm getting too old and "mortal" to try it.
Mike
My A6 engine mated to the HF 5th gear does a bit of an odd thing: it gets up on the cam up at around 4500rpm - which is around 105mph! It's a weird thing - you're accelerating, but just smoothly, easing up the speed, and then you can feel it start pulling stronger and stronger. I don't know where it runs out; I've chickened out around 115-118 mph indicated every time I've tried it. I'd love to find out where the air drag overcomes the "awesome" power of the Si engine, but I'm getting too old and "mortal" to try it. Mike
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