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crxhfz6 · 10-06-2009, 11:29 AM

i have an 89 crx hf with z6 and a 90 si trans. the tanny is at the point now that im just going to replace it. considering that almost all of my driving is to and from school (around 250 miles round trip) i thought that an hf tranny would be nice to get a little better mileage and to quiet things a bit. will any 89-91 hf trans just bolt in or is there going to be anything else that will need changed.

AHHVTEC · 10-06-2009, 11:33 AM

it will bolt right up, no problems at all

INJEN78 · 10-06-2009, 11:42 AM

^yep..and then you will be set for mileage and even lower revs

crxhfz6 · 10-06-2009, 11:46 AM

thanks a lot. that was easy

AHHVTEC · 10-06-2009, 11:48 AM

just make sure you use the clutch and flywheel for the tranny you use

crxhfz6 · 10-06-2009, 03:27 PM

also some people have told me not to do this because the tranny would be a weak point in the drivetrain with this motor while others have said it will handle it just fine. is that anything to worry about

D16SiHatch · 10-06-2009, 03:46 PM

it will be fine, the hf trans is plenty strong enough to handle a z6

jlicrx · 10-06-2009, 05:39 PM

the only thing different between HF and other L3 transmissions is the gear ratios

91civisedaner · 10-06-2009, 05:53 PM

If your super worried about it use a DX/LX tranny it's ratios are in between si and hf .

D15Beater · 10-06-2009, 11:52 PM

A hf transmission should put you around the 2000-2500 rpm range when crusing the interstate. 50-55mph in first gear...

Personally i wouldnt think it would be any fun at all to have a HF transmission unless youre putting out the power to fully take advantage of the stretched out gearing....about 220mph, who wants to do that in a civic? According to this calculator anyways

Honda Transmission Calculator by ZealAutowerks

Reference

Honda Tranny Gear Ratios

jlicrx · 10-07-2009, 01:28 PM

the high altitude CRX HF, like we have here in Colorado, has a 3.777 final drive in the transmission - 3rd gear is about like an Si in 4th gear and 4th gear is about like an Si in 5th gear

crxhfz6 · 10-07-2009, 03:53 PM

do you think that with an almost stock z6 it would be even able to push the car to 220.

D16SiHatch · 10-07-2009, 04:14 PM

with the front of the car jacked up in the air maybe lol, but other then that not even remotely close. that is a theoretical top speed, assuming there was no friction from the road or air.

maykelcj · 10-26-2009, 03:20 AM

go with the HF. I have a DOHC ZC on my 89 hf and long trips are awesome. nothing like making 80 MPH @ 2500 RPM. The tranny will handle the power, but forget about taking off fast. On the trade off you will get great MPG. Mine with some problem I can't figure out yet, makes 47mpg on highway. just remember to put it in 3rd to pass hahahaha.

crxprojectcar · 10-28-2009, 01:26 AM

I think he was convinsed he could go like 220 ... it would be scetchy at 120 without great rubber and suspention plus perfect alignment .. i had my rex at 130 and thats enough fo me, little scary

maykelcj · 10-28-2009, 01:42 AM

Quote:

Originally Posted by crxprojectcar

I think he was convinsed he could go like 220 ...

Better get some wings cause you are gonna fly!

crxhfz6 · 10-28-2009, 02:26 PM

no i never actually thought i could get it up that high. i was fun enough getting it to 115 with the shorter gears

crxhfz6 · 10-28-2009, 02:28 PM

it was more of a why mention it cause its not really possible

91civisedaner · 10-29-2009, 10:27 PM

has any one ever put hf 5th gear in a si trans?? one of my friends has a gsr trans w/an ls 5th gear.

also the gears in an hf are very close to the si trans just the final drive is different 2.95/3.25ca (si is 4.25)Lx/Dx trans has same gears as si but final drive is 3.88 compared to si's 4.25. now seeing this I want to use a hf trans with a si final drive you can take off fast but gears would be longer and a better 5th for freeway cruise'n

10-06-2009, 11:29 AM	#1
crxhfz6 Junior Member Join Date: Oct 2009 Location: Kansas Age: 19 Posts: 22 iTrader: 0 / 0% Ride: 89 crx hf && 2-85 crx dx Rep Power: 1	z6 + hf tranny i have an 89 crx hf with z6 and a 90 si trans. the tanny is at the point now that im just going to replace it. considering that almost all of my driving is to and from school (around 250 miles round trip) i thought that an hf tranny would be nice to get a little better mileage and to quiet things a bit. will any 89-91 hf trans just bolt in or is there going to be anything else that will need changed.

10-06-2009, 11:42 AM	#3
INJEN78 ¿GANGSTA GREMLIN? Join Date: Oct 2007 Location: CT(860) VT(802) Age: 21 Posts: 7,733 iTrader: 5 / 100% Ride: 91 CRX si Rep Power: 214	^yep..and then you will be set for mileage and even lower revs __________________ R.I.P BEN LEE2/24/08 we love and miss you http://burnoutbox.activeboard.com/in...BID=127652&p=1 GOOD FAST CHEAP, you can pick only two. fast and cheap isn't good good and cheap isn't fast good and fast isn't cheap

10-06-2009, 03:46 PM	#7
D16SiHatch Senior Member Join Date: Sep 2007 Posts: 795 iTrader: 0 / 0% Rep Power: 33	it will be fine, the hf trans is plenty strong enough to handle a z6 __________________ 91 Civic Si b18b1, I/H/E, 6000k HID kit, 94 teg cluster Parting mustang out to buy another civic

10-06-2009, 05:39 PM	#8
jlicrx Senior Member Join Date: Jun 2003 Location: Colorado Springs Posts: 1,570 iTrader: 0 / 0% Rep Power: 64	the only thing different between HF and other L3 transmissions is the gear ratios __________________ ZCspeed Racing

10-07-2009, 01:28 PM	#11
jlicrx Senior Member Join Date: Jun 2003 Location: Colorado Springs Posts: 1,570 iTrader: 0 / 0% Rep Power: 64	the high altitude CRX HF, like we have here in Colorado, has a 3.777 final drive in the transmission - 3rd gear is about like an Si in 4th gear and 4th gear is about like an Si in 5th gear __________________ ZCspeed Racing


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10-06-2009, 11:33 AM	#2
AHHVTEC Senior Member Join Date: Oct 2006 Location: Alabama Age: 30 Posts: 11,378 iTrader: 3 / 100% Ride: dc5,mk4 gti,2nd gen civic,92 accord cp,88 crx hf Rep Power: 272	it will bolt right up, no problems at all

10-06-2009, 11:46 AM	#4
crxhfz6 Junior Member Join Date: Oct 2009 Location: Kansas Age: 19 Posts: 22 iTrader: 0 / 0% Ride: 89 crx hf && 2-85 crx dx Rep Power: 1	thanks a lot. that was easy

10-06-2009, 11:48 AM	#5
AHHVTEC Senior Member Join Date: Oct 2006 Location: Alabama Age: 30 Posts: 11,378 iTrader: 3 / 100% Ride: dc5,mk4 gti,2nd gen civic,92 accord cp,88 crx hf Rep Power: 272	just make sure you use the clutch and flywheel for the tranny you use

10-06-2009, 03:27 PM	#6
crxhfz6 Junior Member Join Date: Oct 2009 Location: Kansas Age: 19 Posts: 22 iTrader: 0 / 0% Ride: 89 crx hf && 2-85 crx dx Rep Power: 1	also some people have told me not to do this because the tranny would be a weak point in the drivetrain with this motor while others have said it will handle it just fine. is that anything to worry about

10-06-2009, 05:53 PM	#9
91civisedaner Senior Citizen Join Date: Jan 2009 Location: oregon city or Age: 30 Posts: 116 iTrader: 0 / 0% Ride: 1991 civic sedan 1972 datsun 620 Rep Power: 3	If your super worried about it use a DX/LX tranny it's ratios are in between si and hf .

10-06-2009, 11:52 PM	#10
D15Beater HNFTuning Join Date: Jun 2007 Location: Concord N.C. Posts: 548 iTrader: 0 / 0% Ride: or die.... Blog Entries: 1 Rep Power: 19	A hf transmission should put you around the 2000-2500 rpm range when crusing the interstate. 50-55mph in first gear... Personally i wouldnt think it would be any fun at all to have a HF transmission unless youre putting out the power to fully take advantage of the stretched out gearing....about 220mph, who wants to do that in a civic? According to this calculator anyways Honda Transmission Calculator by ZealAutowerks Reference Honda Tranny Gear Ratios

10-07-2009, 03:53 PM	#12
crxhfz6 Junior Member Join Date: Oct 2009 Location: Kansas Age: 19 Posts: 22 iTrader: 0 / 0% Ride: 89 crx hf && 2-85 crx dx Rep Power: 1	do you think that with an almost stock z6 it would be even able to push the car to 220.

10-07-2009, 04:14 PM	#13
D16SiHatch Senior Member Join Date: Sep 2007 Posts: 795 iTrader: 0 / 0% Rep Power: 33	with the front of the car jacked up in the air maybe lol, but other then that not even remotely close. that is a theoretical top speed, assuming there was no friction from the road or air. __________________ 91 Civic Si b18b1, I/H/E, 6000k HID kit, 94 teg cluster Parting mustang out to buy another civic

10-26-2009, 03:20 AM	#14
maykelcj Member Join Date: Sep 2007 Posts: 56 iTrader: 0 / 0% Rep Power: 5	go with the HF. I have a DOHC ZC on my 89 hf and long trips are awesome. nothing like making 80 MPH @ 2500 RPM. The tranny will handle the power, but forget about taking off fast. On the trade off you will get great MPG. Mine with some problem I can't figure out yet, makes 47mpg on highway. just remember to put it in 3rd to pass hahahaha.

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10-28-2009, 01:26 AM	#15
crxprojectcar Junior Member Join Date: Oct 2009 Location: spokane wa Age: 19 Posts: 23 iTrader: 0 / 0% Ride: 88 b16a rex Rep Power: 1	I think he was convinsed he could go like 220 ... it would be scetchy at 120 without great rubber and suspention plus perfect alignment .. i had my rex at 130 and thats enough fo me, little scary

10-28-2009, 02:26 PM	#17
crxhfz6 Junior Member Join Date: Oct 2009 Location: Kansas Age: 19 Posts: 22 iTrader: 0 / 0% Ride: 89 crx hf && 2-85 crx dx Rep Power: 1	no i never actually thought i could get it up that high. i was fun enough getting it to 115 with the shorter gears

10-28-2009, 02:28 PM	#18
crxhfz6 Junior Member Join Date: Oct 2009 Location: Kansas Age: 19 Posts: 22 iTrader: 0 / 0% Ride: 89 crx hf && 2-85 crx dx Rep Power: 1	it was more of a why mention it cause its not really possible

10-29-2009, 10:27 PM	#19
91civisedaner Senior Citizen Join Date: Jan 2009 Location: oregon city or Age: 30 Posts: 116 iTrader: 0 / 0% Ride: 1991 civic sedan 1972 datsun 620 Rep Power: 3	has any one ever put hf 5th gear in a si trans?? one of my friends has a gsr trans w/an ls 5th gear. also the gears in an hf are very close to the si trans just the final drive is different 2.95/3.25ca (si is 4.25)Lx/Dx trans has same gears as si but final drive is 3.88 compared to si's 4.25. now seeing this I want to use a hf trans with a si final drive you can take off fast but gears would be longer and a better 5th for freeway cruise'n Last edited by 91civisedaner; 10-29-2009 at 10:45 PM.

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z6 + hf tranny