S15 versus ?? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

SR20AE86 · 09-12-2006, 05:14 AM

New here and hate to reask for info but i couldn't find what i was looking for.
I am looking for info on head design/config for SR20's. The only thing that i have been able to find is that the 14 and 15 engine's had variable timing. If this is the only change then cool, but the rumors are that the 15 head is better(you don't need lash killers, rocker stoppers) i believe that the 14 and 15 head is the same with a slightly better cam in the 15. This is just for my own knowledge so i can call bullshit when someone is spu-ing at the mouth.

Known facts are
15's crank is lighter, different rings were used and it had a BB turbo.

Any info will be greatly appreciated Thanks in advance

LB.Motoring · 09-12-2006, 01:34 PM

Quote:

Originally Posted by SR20AE86

New here and hate to reask for info but i couldn't find what i was looking for.
I am looking for info on head design/config for SR20's. The only thing that i have been able to find is that the 14 and 15 engine's had variable timing. If this is the only change then cool, but the rumors are that the 15 head is better(you don't need lash killers, rocker stoppers) i believe that the 14 and 15 head is the same with a slightly better cam in the 15. This is just for my own knowledge so i can call bullshit when someone is spu-ing at the mouth.

Known facts are
15's crank is lighter, different rings were used and it had a BB turbo.

Any info will be greatly appreciated Thanks in advance

You can allways buy a s14 SR if you really want it, and buy a Egay Rocker stopper, very cheap, have on in a friends SR, and upgrade to a s15 turbo, or a disco potato, and you are looking at a very similar output between the both, with a lower price total on the s14 sr
The bellhousing will be a diffrent shape I believe, and if you deicide on a s15 sr, if you have bank you will get a 6spd... my idea, waste of money, you could buy a s14 sr and suspension

best bet

g6civcx · 09-12-2006, 02:12 PM

You may also look into the S13 blacktop SR as well. There are very subtle differences between the blacktop and the S15, but you can easily adress the issues of the blacktop and have an engine that is just as reliable and much easier to work with.

SR20AE86 · 09-12-2006, 02:25 PM

That is all fine and well and no the bell housing aren't any diff. SR is SR.

I need to know about the head. I have a s14 engine w/s15 crank aftermarket rods,pistons,HG,cams and springs,valves,rocker stoppers and ARP throughout.
I am aware of the power potential of the 14 engine or any other SR for that matter.

People here get a fortune for s14-15. i have bought red tops for as little as $100 and you can't touch black top for that. One of the selling points and key elements to getting more money for the 15 engine is that the head flows better and has less problems. 2 engines side by side one 14 the other 15 same Kilo's you are garrenteed to spend an extra $500 for the 15.

Shadytrixta1 · 09-12-2006, 02:26 PM

From what i've found S13 is the best platform to start modding and get the most power(correct me if im wrong).Plus S15 six speed=Garbage, its pretty weak.

SR20AE86 · 09-12-2006, 02:29 PM

Quote:

Originally Posted by g6civcx

You may also look into the S13 blacktop SR as well. There are very subtle differences between the blacktop and the S15, but you can easily adress the issues of the blacktop and have an engine that is just as reliable and much easier to work with.

Thanks and i have looked at ZY and this doesn't answer the Q. Thanks tho

Quote:

Originally Posted by Shadytrixta1

From what i've found S13 is the best platform to start modding and get the most power(correct me if im wrong).Plus S15 six speed=Garbage, its pretty weak.

Not from personal experiance but yes i have been told by lots of owners they hated it and went back to 5 speed and stopped having mission issues.

g6civcx · 09-12-2006, 03:56 PM

Quote:

Originally Posted by SR20AE86

Thanks and i have looked at ZY and this doesn't answer the Q.

If you look at the original thread, you did not ask a "Q". You simply said:

Quote:

Originally Posted by SR20AE86

Any info will be greatly appreciated

I gave you some "info". If you want more specific answers, you have to ask more specific questions.

HKsilvia · 09-12-2006, 04:06 PM

Quote:

Originally Posted by Shadytrixta1

From what i've found S13 is the best platform to start modding and get the most power(correct me if im wrong).Plus S15 six speed=Garbage, its pretty weak.

did u actually have experienced the S15 6-speed or just words from friends?
if u gonna abuse it or drift with it or mod over 310hp, yes i might be weak, but as original daily driven, its a very nice transmition to play with. 65mph 2500rpm and 80 at 3000... nuff said

Stillslow · 09-12-2006, 04:51 PM

I have both motors but I have never taken my S15 head apart or else I would gladly help you out.

LB.Motoring · 09-12-2006, 05:35 PM

Quote:

Originally Posted by g6civcx

You may also look into the S13 blacktop SR as well. There are very subtle differences between the blacktop and the S15, but you can easily adress the issues of the blacktop and have an engine that is just as reliable and much easier to work with.

oh yah lool i was looking at something else for the bellhousing...

^ the blacktop s13 kouki model SR.... is much diffrence than the s15 SR..

Quote:

Originally Posted by HKsilvia

did u actually have experienced the S15 6-speed or just words from friends?
if u gonna abuse it or drift with it or mod over 310hp, yes i might be weak, but as original daily driven, its a very nice transmition to play with. 65mph 2500rpm and 80 at 3000... nuff said

The tranny ratios are exactly the same in final drive between the 5spd and 6spd trannys....
if you looking to change your final drive ratio, the diff is what would do it

http://www.zilvia.net/f/showthread.php?t=110895

sean350z · 09-12-2006, 07:58 PM

Quote:

Originally Posted by LB.Motoring

The bellhousing will be a diffrent shape I believe, and if you deicide on a s15 sr, if you have bank you will get a 6spd...

i have an S15 SR20 with an S13 transmission...bellhousing is the same you just need to use a s13/14 flywheel

HKsilvia · 09-13-2006, 04:10 AM

Quote:

Originally Posted by LB.Motoring

The tranny ratios are exactly the same in final drive between the 5spd and 6spd trannys....
if you looking to change your final drive ratio, the diff is what would do it

http://www.zilvia.net/f/showthread.php?t=110895

i dunno about the gear ratio stuff so i just imagining...
even they have the same final drive between 5-6, by the time i hit 5 gear,the car has achieve higher speed then the 5 speed one, so i need less throttle/effort to get to 65 or whatever speed i desire (base on gas saving driving ie. shift at 3k rpm) ?
i dunno about these stuff, correct me if im wrong

SR20AE86 · 09-14-2006, 03:27 AM

Quote:

Originally Posted by sean350z

i have an S15 SR20 with an S13 transmission...bellhousing is the same you just need to use a s13/14 flywheel

Good lookin out.

And my friends who have s15's race them may it be drag,Togei, and drift.
310HP is extremely easy w/15's due to the Turbo and bigger injectors. They are very desirable due to its versatility and available power for min. amts of money. not to mention they are F#@kin sexy.

harlockssx · 09-14-2006, 08:34 AM

S14 & 15 have a more restrictive port in the head than S13s have, however the intake design is better in a 14/15. The VTC severely limits your cam choices as well. The only REAL advantage on the 15 over a 14 is a slightly better turbo, mildly differnt cams & slightly bigger injectors. The 6-speed is NOT durable at all. Both the 14 & 15 have larger oil squirters than the red top 13 (blacktop 13 has the same as the 14 & 15) which supposedly help keep the pistons cooler under boost. I say go with a blacktop 13, easiest to work on & get parts for, cheaper than a 14 or 15, and usually in better shape than a redtop. My 2 cents.

09-12-2006, 05:14 AM	#1
SR20AE86 Join Date: Sep 2006 Location: Okinawa Japan Posts: 4 Trader Rating: (0) Feedback Score: 0 reviews	S15 versus ?? New here and hate to reask for info but i couldn't find what i was looking for. I am looking for info on head design/config for SR20's. The only thing that i have been able to find is that the 14 and 15 engine's had variable timing. If this is the only change then cool, but the rumors are that the 15 head is better(you don't need lash killers, rocker stoppers) i believe that the 14 and 15 head is the same with a slightly better cam in the 15. This is just for my own knowledge so i can call bullshit when someone is spu-ing at the mouth. Known facts are 15's crank is lighter, different rings were used and it had a BB turbo. Any info will be greatly appreciated Thanks in advance

09-14-2006, 08:34 AM	#14
harlockssx Zilvia Junkie Join Date: Nov 2005 Location: APO AP 96367 Age: 52 Posts: 463 Trader Rating: (19) Feedback Score: 19 reviews	S14 & 15 have a more restrictive port in the head than S13s have, however the intake design is better in a 14/15. The VTC severely limits your cam choices as well. The only REAL advantage on the 15 over a 14 is a slightly better turbo, mildly differnt cams & slightly bigger injectors. The 6-speed is NOT durable at all. Both the 14 & 15 have larger oil squirters than the red top 13 (blacktop 13 has the same as the 14 & 15) which supposedly help keep the pistons cooler under boost. I say go with a blacktop 13, easiest to work on & get parts for, cheaper than a 14 or 15, and usually in better shape than a redtop. My 2 cents. __________________ Old School

09-12-2006, 02:12 PM	#3
g6civcx Post Whore! Join Date: Apr 2004 Location: Virginia, USA Posts: 5,764 Trader Rating: (5) Feedback Score: 5 reviews	You may also look into the S13 blacktop SR as well. There are very subtle differences between the blacktop and the S15, but you can easily adress the issues of the blacktop and have an engine that is just as reliable and much easier to work with.

09-12-2006, 02:25 PM	#4
SR20AE86 Join Date: Sep 2006 Location: Okinawa Japan Posts: 4 Trader Rating: (0) Feedback Score: 0 reviews	That is all fine and well and no the bell housing aren't any diff. SR is SR. I need to know about the head. I have a s14 engine w/s15 crank aftermarket rods,pistons,HG,cams and springs,valves,rocker stoppers and ARP throughout. I am aware of the power potential of the 14 engine or any other SR for that matter. People here get a fortune for s14-15. i have bought red tops for as little as $100 and you can't touch black top for that. One of the selling points and key elements to getting more money for the 15 engine is that the head flows better and has less problems. 2 engines side by side one 14 the other 15 same Kilo's you are garrenteed to spend an extra $500 for the 15.

09-12-2006, 02:26 PM	#5
Shadytrixta1 Leaky Injector Join Date: May 2006 Location: Riverview, Fl Posts: 149 Trader Rating: (0) Feedback Score: 0 reviews	From what i've found S13 is the best platform to start modding and get the most power(correct me if im wrong).Plus S15 six speed=Garbage, its pretty weak.

09-12-2006, 04:51 PM	#9
Stillslow Leaky Injector Join Date: Nov 2005 Location: NB canada Posts: 78 Trader Rating: (0) Feedback Score: 0 reviews	I have both motors but I have never taken my S15 head apart or else I would gladly help you out.