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Sofast · 09-19-2009, 11:38 PM

Bought a 90 crx shell with the rest of the body and interior in boxes. I got it all together. Now Im waiting on a clutch to arrive and the motor and trans are going in. Anyhow before I do this I need to know if the HF transmission is a pooch. Will I notice poor performance? If so what are my other options?

AHHVTEC · 09-20-2009, 12:25 AM

the si is a much shorter geared trans than the hf you will notice a big difference

Sofast · 09-20-2009, 07:27 AM

sorry posted in wrong forum

Sofast · 09-20-2009, 07:28 AM

Bought a 90 crx] shell with the rest of the body and interior in boxes. I got it all together. Now Im waiting on a clutch to arrive and the motor and trans are going in. Anyhow before I do this I need to know if the HF transmission is a pooch. Will I notice poor performance? If so what are my other options?

Jeef · 09-20-2009, 09:43 AM

moved it to the right forum for you

INJEN78 · 09-20-2009, 09:52 AM

def. a big differance...almost like driving the slow auto then going to the standard..

4Door89 · 09-20-2009, 10:13 AM

i drove a customers car yesterday. (SI) mine is a DX, almost felt like it had a diffrent attitude. definatly doing this swap when i have my motor out. i would go SI, better FD.

B · 09-20-2009, 03:15 PM

The gearing on the HF is very long. you will have much less acceleration force with the longer gears.

D16SiHatch · 09-20-2009, 03:31 PM

yep ^

you will be much happier if you can find yourself an Si tranny. or at the very least a Dx trans.

caboose · 09-20-2009, 08:06 PM

i think that some people combine the si and hf transmissions. usually taking the 5th gear out of the hf and putting it the si for better mileage when crusing, but also giving better acceleration in 1st through 4th

CmR333 · 09-21-2009, 09:26 AM

Yeah i agree , i just put a d15b in my girls rex with the stock hf tranny. 1st is ok but 2nd though 4th it falls on its face in the lower rpms, plus the tiny little hf clutch cant really take any power. one plus though is that you can redline at 85 mph in 2nd lol. get the si tranny.

D15Beater · 09-21-2009, 06:17 PM

Si and Dx have the same gears 1-5, the final drive is the difference.

AHHVTEC · 09-21-2009, 06:23 PM

this is correct ^ the only one with different gears are the hf and std

09-19-2009, 11:38 PM	#1
Sofast Member Join Date: Sep 2009 Age: 35 Posts: 48 iTrader: 0 / 0% Rep Power: 1	SI Trans VS. HF Bought a 90 crx shell with the rest of the body and interior in boxes. I got it all together. Now Im waiting on a clutch to arrive and the motor and trans are going in. Anyhow before I do this I need to know if the HF transmission is a pooch. Will I notice poor performance? If so what are my other options?

09-20-2009, 07:28 AM	#4
Sofast Member Join Date: Sep 2009 Age: 35 Posts: 48 iTrader: 0 / 0% Rep Power: 1	SI Trans VS. HF Bought a 90 crx] shell with the rest of the body and interior in boxes. I got it all together. Now Im waiting on a clutch to arrive and the motor and trans are going in. Anyhow before I do this I need to know if the HF transmission is a pooch. Will I notice poor performance? If so what are my other options? Last edited by B; 09-20-2009 at 03:14 PM..

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09-20-2009, 12:25 AM	#2
AHHVTEC Senior Member Join Date: Oct 2006 Location: Alabama Age: 30 Posts: 11,527 iTrader: 3 / 100% Ride: dc5,mk4 gti,2nd gen civic,92 accord cp,88 crx hf Rep Power: 346	the si is a much shorter geared trans than the hf you will notice a big difference

09-20-2009, 07:27 AM	#3
Sofast Member Join Date: Sep 2009 Age: 35 Posts: 48 iTrader: 0 / 0% Rep Power: 1	sorry posted in wrong forum

09-20-2009, 09:43 AM	#5
Jeef Super Moderator Join Date: Sep 2002 Location: CT Age: 29 Posts: 4,624 iTrader: 0 / 0% Ride: 06 Chevy Silverado Rep Power: 108	moved it to the right forum for you

09-20-2009, 09:52 AM	#6
INJEN78 ¿GANGSTA GREMLIN? Join Date: Oct 2007 Location: CT(860) VT(802) Age: 21 Posts: 8,199 iTrader: 7 / 100% Ride: 91 CRX si Rep Power: 240	def. a big differance...almost like driving the slow auto then going to the standard..

09-20-2009, 10:13 AM	#7
4Door89 Member Join Date: Aug 2009 Age: 23 Posts: 34 iTrader: 0 / 0% Rep Power: 1	i drove a customers car yesterday. (SI) mine is a DX, almost felt like it had a diffrent attitude. definatly doing this swap when i have my motor out. i would go SI, better FD.

09-20-2009, 03:15 PM	#8
B Administrator Join Date: Nov 2007 Location: down in the villiage area Age: 29 Posts: 8,651 iTrader: 0 / 0% Ride: 2010 Hyundai Genesis Coupe 2.0t Track Edition, 2000 Dakota Rep Power: 481	The gearing on the HF is very long. you will have much less acceleration force with the longer gears.

09-20-2009, 03:31 PM	#9
D16SiHatch Senior Member Join Date: Sep 2007 Posts: 880 iTrader: 0 / 0% Rep Power: 35	yep ^ you will be much happier if you can find yourself an Si tranny. or at the very least a Dx trans.

09-20-2009, 08:06 PM	#10
caboose USDM to the bone Join Date: Aug 2008 Location: Hamilton, MI Age: 22 Posts: 473 iTrader: 0 / 0% Ride: 96 Accord EX, 88 Dodge Daytona Shelby Z T-tops Rep Power: 25	i think that some people combine the si and hf transmissions. usually taking the 5th gear out of the hf and putting it the si for better mileage when crusing, but also giving better acceleration in 1st through 4th

09-21-2009, 09:26 AM	#11
CmR333 CANT THINK OF ANYTHING Join Date: Jun 2009 Location: JACKSONVILLE FL Age: 27 Posts: 19 iTrader: 0 / 0% Ride: 91 mr2 , 93 240sx vert , 89 crx, none of them are stock. Rep Power: 2	Yeah i agree , i just put a d15b in my girls rex with the stock hf tranny. 1st is ok but 2nd though 4th it falls on its face in the lower rpms, plus the tiny little hf clutch cant really take any power. one plus though is that you can redline at 85 mph in 2nd lol. get the si tranny.

09-21-2009, 06:17 PM	#12
D15Beater HNFTuning Join Date: Jun 2007 Location: Concord N.C. Posts: 551 iTrader: 0 / 0% Ride: or die.... Blog Entries: 1 Rep Power: 20	Si and Dx have the same gears 1-5, the final drive is the difference.

09-21-2009, 06:23 PM	#13
AHHVTEC Senior Member Join Date: Oct 2006 Location: Alabama Age: 30 Posts: 11,527 iTrader: 3 / 100% Ride: dc5,mk4 gti,2nd gen civic,92 accord cp,88 crx hf Rep Power: 346	this is correct ^ the only one with different gears are the hf and std

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SI Trans VS. HF