my buddy is going to swap in a d16a6 motor into his dx crx so should he keep his dx trani or get an si trani? i always thow the si was geared better it will also be in a boosted car any info will help thanks

if it wont make that big of a diffrence he rather keep the dx so he dont have to mess around finding an si and all that

 

THe si tranny will accelerate better because of the higher final drive but the gearing is the same 1-5 with the dx and si trannys..If you can get the si tranny cheap go for it,if not the dx tranny will suffice.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr.speaker &raquo;</TD></TR><TR><TD CLASS="quote">THe si tranny will accelerate better because of the higher final drive but the gearing is the same 1-5 with the dx and si trannys..If you can get the si tranny cheap go for it,if not the dx tranny will suffice.</TD></TR></TABLE>

i didnt really get that so the si trani is only diffrent in 5th gear? or all around? and he has a dx trani and an si will coast 150 his goals are just to have fun with the the car so should he waste the money and get the si trani?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lshatch1.8 &raquo;</TD></TR><TR><TD CLASS="quote">

i didnt really get that so the si trani is only diffrent in 5th gear? or all around? and he has a dx trani and an si will coast 150 his goals are just to have fun with the the car so should he waste the money and get the si trani?</TD></TR></TABLE>

No..The final drive is different so it gives better acceleration in all gears but the gear ratios 1-5 and reverse are exactly the same..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr.speaker &raquo;</TD></TR><TR><TD CLASS="quote">

No..The final drive is different so it gives better acceleration in all gears but the gear ratios 1-5 and reverse are exactly the same..</TD></TR></TABLE>

Yup.

 

alright thanks alot guys

 

yeah like some one stated earlier. stick with the DX if u cant find a cheap SI one...

the difference isnt that much when comparing both trannies...

 

hmm well that thing is we have a buyer for his dx trani.... So from the sound of it i think we should do that and go with the si trani.. id hate to be boosted and done with the car then to noitce the trani is the week point (kind of like an b16 with ls trani)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lshatch1.8 &raquo;</TD></TR><TR><TD CLASS="quote">hmm well that thing is we have a buyer for his dx trani.... So from the sound of it i think we should do that and go with the si trani.. id hate to be boosted and done with the car then to noitce the trani is the week point (kind of like an b16 with ls trani)</TD></TR></TABLE>

Thats completley different..Remember the b16 has vtec and is all top end power..Where as the ls has no vtec and is all low down power,,Those 2 motors have completely different powerbands,,and the gear ratios are different as well as the final drive..But the d15b1/2 and d16a6 motors have around the same powerband and basically the same tranny besides final drive so its not that big of a deal..

 

hmm might have to leave it up to him...

 

If you are gonna boost the motor, keep your DX trans. The turbo will more than make up for the gearing, and it will let you stay up in high RPMS longer, where the SI will run out too fast. We have swapped out a few SI transmissions for the DX model, just for that reason.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bigcalidave &raquo;</TD></TR><TR><TD CLASS="quote">If you are gonna boost the motor, keep your DX trans. The turbo will more than make up for the gearing, and it will let you stay up in high RPMS longer, where the SI will run out too fast. We have swapped out a few SI transmissions for the DX model, just for that reason.</TD></TR></TABLE>

thats a good thing to do for high boost setups, but IMO and from what i have ran the SI works best with boost (under 20) because when u shift up ur right back into boost...

i noticed with teh dx sometimes i would fall out, but not by much...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bigcalidave &raquo;</TD></TR><TR><TD CLASS="quote">If you are gonna boost the motor, keep your DX trans. The turbo will more than make up for the gearing, and it will let you stay up in high RPMS longer, where the SI will run out too fast. We have swapped out a few SI transmissions for the DX model, just for that reason.</TD></TR></TABLE>thats a joke...i dont care what you are running, a shorter geared tranny will accelerate faster than a longer geared one anyday. if you are looking to be fast, dont mess around with the DX, the SI will net you better trap speeds any day of the week. and fall off? i dont see how that is possible. i run an SI in my boosted CRX and my car will do 140+ before i hit rev limiter in 5th.

 

I recently figured out the simplest way to explain a transmissions gearing to anyone, even a ten year old with a.d.d. would understand. . . . . All right think mountain bike, the gears mounted to the rear wheel are gears one through five. and the big gear at the pedals is the FINAL drive, throw that crap in a metal case and you have a tranny. the higher (si)the final drive is, the faster the car will get to top speed but you'll end up with a low top end speed. Now with a lower(dx) final drive the car will get to top speed slower but will have a higher top speed, it all depends on wat kind of racing you wanna do. But since you wanna go high power the dx tranny might work better cause the motor will have the power to get through the gears as if it we're an si but then you'd have the extra top end to play with. You also gotta keep in mind how strong the gears will be, an integra is a perfect example the gears are almost identicle in an ls and in a gsr but the gsr has hardened gears built for abuse, you could buy one expensive one or keep two cheap trannys on hand in case one gives. . . . . . .by the way did I mention that I'm I have a dx tranny for sale?

 

Wow.. . . . .I just noticed how friggin long that last post was I should've labeled it "thorough explanation"

 

hahah good stuff guys and thats for the offer on the dx trani for sale but he has one anyways after reading this hole post sounds like the dx might work but the si would be better.... im just going to show him the post and let him decide if anyone else has anything to throw out nows the time

 

si brother, better for boost, rpms are up as soon as you shift equaling in less lag and more power on demand yada yada

 

Like I said before, from my personal experience, the SI trans accelerates so fast that 1st gear is undriveable under boost and second isn't much better. For the 1/4 I'd rather avoid shifting into 4th, and for auto-x, I like to be able to stay in high 1st gear and under boost. For the real numbers, an SI transmission, with standard 185/60/r14 tires, at 7200 RPM, has a top speed of 148.71 mph if you can get there. The DX transmission with the same numbers will have a top speed of 162.55 mph.

Si top speeds per gear

1st:35.27
2nd:60.53
3rd:91.06
4th:122.36
5th:148.71

DX top speeds per gear

1st:38.56
2nd:66.17
3rd:99.54
4th:133.75
5th:162.55

Tools used, if you want to do your own calculations based on tire sizes and gears.

Speed Calculator
http://www.perfectracing.com/t...c.htm

CRX Specifications
http://members.lycos.nl/hendrik/crx/crxtech2.htm

Tire Diameter Calculator
http://www.net-comber.com/tirecalc.html

I'll stick with the DX trans personally. Do what you think will be best.

Dave

 

si tranny by all means, the dx tranny is long, i can get 100 mph out of mine in 3rd gear with a dohc zc

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lshatch1.8 &raquo;</TD></TR><TR><TD CLASS="quote">my buddy is going to swap in a d16a6 motor into his dx crx so should he keep his dx trani or get an si trani? i always thow the si was geared better it will also be in a boosted car any info will help thanks

if it wont make that big of a diffrence he rather keep the dx so he dont have to mess around finding an si and all that</TD></TR></TABLE>

I am doing the same thing. I have a dx and going to put an A6 in there. They person that I bought the A6 from also had the Si tranny. So I bought the motor, tranny, ecu, and everything for $425. I think we might even put an HF 5th gear in the si tranny since it will be built for everyday driving and traveling on the highway for long periods of time.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bigcalidave &raquo;</TD></TR><TR><TD CLASS="quote">Like I said before, from my personal experience, the SI trans accelerates so fast that 1st gear is undriveable under boost and second isn't much better. For the 1/4 I'd rather avoid shifting into 4th, and for auto-x, I like to be able to stay in high 1st gear and under boost. For the real numbers, an SI transmission, with standard 185/60/r14 tires, at 7200 RPM, has a top speed of 148.71 mph if you can get there. The DX transmission with the same numbers will have a top speed of 162.55 mph.

Si top speeds per gear

1st:35.27
2nd:60.53
3rd:91.06
4th:122.36
5th:148.71

DX top speeds per gear

1st:38.56
2nd:66.17
3rd:99.54
4th:133.75
5th:162.55

Tools used, if you want to do your own calculations based on tire sizes and gears.

Speed Calculator
http://www.perfectracing.com/t...c.htm

CRX Specifications
http://members.lycos.nl/hendrik/crx/crxtech2.htm

Tire Diameter Calculator
http://www.net-comber.com/tirecalc.html

I'll stick with the DX trans personally. Do what you think will be best.

Dave</TD></TR></TABLE>

after reading this i might talk to him about maybe sticking with the dx trani.. just because he can save the money to finish the turbo kit and will still be a nice street race(unlike my hatchback that i cant boost in 1st cause it goes by to fast and just spins anyways) but yeah anyone else cause im really thinking about sticking with the dx he already has it and it shifts good.... And if it will do why go out and spend money on an si trani...

 

yeah but are u seriously trying to go 160 MPH in a EF??

i have hit 120 on the track, and 145 on the freeway, and its scary insane not really worth it IMO

but its a simple cut dry answer, the si will yeild u better acceleration, and keep u in your powerband if u do autocrossing and things in that nature that u need the power instantly with the si its there, with the dx its there in a second or two or three...

but for the hassle id stay with the dx, almost the same and u dont have to look for another tranny...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Nerologic &raquo;</TD></TR><TR><TD CLASS="quote">yeah but are u seriously trying to go 160 MPH in a EF??

i have hit 120 on the track, and 145 on the freeway, and its scary insane not really worth it IMO

but its a simple cut dry answer, the si will yeild u better acceleration, and keep u in your powerband if u do autocrossing and things in that nature that u need the power instantly with the si its there, with the dx its there in a second or two or three...</TD></TR></TABLE>+1

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Nerologic &raquo;</TD></TR><TR><TD CLASS="quote">yeah but are u seriously trying to go 160 MPH in a EF??

i have hit 120 on the track, and 145 on the freeway, and its scary insane not really worth it IMO

but its a simple cut dry answer, the si will yeild u better acceleration, and keep u in your powerband if u do autocrossing and things in that nature that u need the power instantly with the si its there, with the dx its there in a second or two or three...

but for the hassle id stay with the dx, almost the same and u dont have to look for another tranny...</TD></TR></TABLE>

I only went 115 mph on a road near my house with the Si tranny, but it made a lot of difference compare to the HF tranny.

Thanks to Andres^^^^^^^^^^^^^^

 

i think anything compared to the HF is fast, i remember i drove a 95 DX civic sedan after driving my 88 hf around for a while i was like wow the acceleration is insane