oh ye turbo gurus MkII - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

*SaintlyCharBoy* · 06-01-2002, 12:11 AM

what would be the advantage (if any) other than sheer coolness factor of running 2 relatively low boost turbos (ie z32 stockers)

i would imagine that they might spool up quicker, but, after crawling my way through Maximum Boost, it would seem that running duals would be less efficient

i'm looking at doing this all myself, on a second block, so cost in time is not really a big deal, i'm just worried about starting a project that would have little real gain comparitavely

thanks all
Sean

wherezmytofu · 06-01-2002, 02:28 AM

im confused...what car u got?...toyota mk2?  <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/confused.gif" border="0" valign="absmiddle" alt='???'>

*SaintlyCharBoy* · 06-01-2002, 07:10 AM

no, i've an S14, MkII as in Part 2... sorry

Racer X · 06-02-2002, 08:18 AM

on a foUr cylinder? two turbos um no you dont have the exhaust the z32 has that mean more lag than a z32 which is counter productive right. also if you want faster spool try running a slight quicker turbine ratio or a smaller turbo all together also a nicely designed exhaust mani will help spool up with a split enrty housing have cylinders 1/3 and 2/4 together this makes for faster spool up also big free flowing exhausts help a let as does shorter inter cooler plumbing but on the other hand two would a certin coolness factor just ultimantly slower
<img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/biggrin.gif" border="0" valign="absmiddle" alt='

'> just my $.02
please excuse any spelling errors

Racer X · 06-02-2002, 08:21 AM

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (Racer X @ June 02 2002,09:18)</td></tr><tr><td id="QUOTE">on a four cylinder? two turbos um no you dont have the exhaust energy the z32 has that means more lag than a z32 which is counter productive right. also if you want faster spool try running a slight quicker turbine ratio or a smaller turbo all together also a nicely designed exhaust mani will help spool up with a split enrty housing have cylinders 1/3 and 2/4 together this makes for faster spool up also big free flowing exhausts help a let as does shorter intercooler plumbing but on the other hand two would have a certin coolness factor just ultimantly slower
<img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/biggrin.gif" border="0" valign="absmiddle" alt='

'> just my $.02
please excuse any spelling errors</td></tr></table><span id='postcolor'>
also woulndt this cost quite a bit to exacute

240racer · 06-02-2002, 01:20 PM

If you want to start a project that will be sure to have gains and fix the spool up problem of larger turbos you have two options.  Get a larger turbo, stand alone ECU and nitrous.  USe the nitrous and the ECu to keep the turbo spooled and then you won't have to worry about lack of flow at high horsepower levels.
Option number two, get a bigger engine.  if you want more power the bigger engines are always the best solution.  Of course I am expecting you to turbo it too, but there is no replacement for displacement.

The reason that 6 cylinder engines are sometimes twin or bi turboed is because 3 cylinders is the best number for pulse cancellation.  This is why the turbo F1 cars were v6's.  Same with the z32, supra MKIV etc.  for a I-4 one turbo is best.  If you don't want to do all the work I mentioned above (you did say money and time weren't an issue, what world do you live in???) then just change your compressor and turbine ratio to be more effiecent where you want to be.  Everything is a compromise, but 2 turbos isn't better in this case.

MarketPlayer · 06-02-2002, 01:36 PM

Instead of going w/ two turbos, use two different kinds of forced induction!  I have been thinking of a way to connect a high powered electric motor to a supercharger and connect it to a toggle switch!  When you need boost right away, then flip the switch and there it is!  This is just an idea and i haven't really spent too much time w/ it but here is how far i have gotten!

when the switch is flipped the supecharger will start creating boost!  Therfore you would have to have a pretty good blow-off valve to releave all the built up pressure when you are at idle!  (aren't blow-off valves connected to the throttle body?  therfore when it is closed the valve is open?)  When you step on it the valve shuts and lets maybe 3-5psi in right away to start spooling up the turbo faster!  Once the turbo has spooled up the supercharger can be turned off and let the turbo do the work!  This of course would fit into your, money and time is not an issue, world!  As for how to join the two charged air flows, spearco make a intercooler for dual turbo charged cars, and one inlet can be for turbo and the other for super.  You just have to figure out someway of keeping the turbo chargers pressurized air from escaping through the supercharger!  It is best to draw out this idea, than just read it, but i don't have any place to hoste pictures online!  Good luck!
-zac

ridebmx · 06-02-2002, 10:37 PM

if im not mistaken didnt they make something for the mk1 mr2 for a super/turbo setup, i could have swore through all the reading i did when i owned one that i came across something about a supercharger/turbo setup...

Racer X · 06-02-2002, 10:47 PM

yes hks made an intake mani with two tracks one for roots blower and the other for turbo and it could switch between the mk1 mr2 scc 02 uscc used this set up it sucked, plus n02

06-01-2002, 12:11 AM	#1
SaintlyCharBoy Premium Member Join Date: Jan 2002 Location: Bow, NH Age: 43 Posts: 849 Trader Rating: (1) Feedback Score: 1 reviews	what would be the advantage (if any) other than sheer coolness factor of running 2 relatively low boost turbos (ie z32 stockers) i would imagine that they might spool up quicker, but, after crawling my way through Maximum Boost, it would seem that running duals would be less efficient i'm looking at doing this all myself, on a second block, so cost in time is not really a big deal, i'm just worried about starting a project that would have little real gain comparitavely thanks all Sean __________________ 92 vert - KADE + VH41 + GM MA5 = too many parts in the garage 95 base - retired

06-01-2002, 07:10 AM	#3
SaintlyCharBoy Premium Member Join Date: Jan 2002 Location: Bow, NH Age: 43 Posts: 849 Trader Rating: (1) Feedback Score: 1 reviews	no, i've an S14, MkII as in Part 2... sorry __________________ 92 vert - KADE + VH41 + GM MA5 = too many parts in the garage 95 base - retired

06-02-2002, 08:18 AM	#4
Racer X Zilvia Junkie Join Date: Apr 2002 Location: brooklyn park Age: 42 Posts: 334 Trader Rating: (2) Feedback Score: 2 reviews	on a foUr cylinder? two turbos um no you dont have the exhaust the z32 has that mean more lag than a z32 which is counter productive right. also if you want faster spool try running a slight quicker turbine ratio or a smaller turbo all together also a nicely designed exhaust mani will help spool up with a split enrty housing have cylinders 1/3 and 2/4 together this makes for faster spool up also big free flowing exhausts help a let as does shorter inter cooler plumbing but on the other hand two would a certin coolness factor just ultimantly slower <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/biggrin.gif" border="0" valign="absmiddle" alt=''> just my $.02 please excuse any spelling errors __________________ Twin67 ls1/awd in the works

06-02-2002, 08:21 AM	#5
Racer X Zilvia Junkie Join Date: Apr 2002 Location: brooklyn park Age: 42 Posts: 334 Trader Rating: (2) Feedback Score: 2 reviews	</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (Racer X @ June 02 2002,09:18)</td></tr><tr><td id="QUOTE">on a four cylinder? two turbos um no you dont have the exhaust energy the z32 has that means more lag than a z32 which is counter productive right. also if you want faster spool try running a slight quicker turbine ratio or a smaller turbo all together also a nicely designed exhaust mani will help spool up with a split enrty housing have cylinders 1/3 and 2/4 together this makes for faster spool up also big free flowing exhausts help a let as does shorter intercooler plumbing but on the other hand two would have a certin coolness factor just ultimantly slower <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/biggrin.gif" border="0" valign="absmiddle" alt=''> just my $.02 please excuse any spelling errors</td></tr></table><span id='postcolor'> also woulndt this cost quite a bit to exacute __________________ Twin67 ls1/awd in the works

06-02-2002, 01:20 PM	#6
240racer Zilvia Junkie Join Date: Nov 2001 Location: Minneapolis, MN Age: 46 Posts: 574 Trader Rating: (0) Feedback Score: 0 reviews	If you want to start a project that will be sure to have gains and fix the spool up problem of larger turbos you have two options.  Get a larger turbo, stand alone ECU and nitrous.  USe the nitrous and the ECu to keep the turbo spooled and then you won't have to worry about lack of flow at high horsepower levels. Option number two, get a bigger engine.  if you want more power the bigger engines are always the best solution.  Of course I am expecting you to turbo it too, but there is no replacement for displacement. The reason that 6 cylinder engines are sometimes twin or bi turboed is because 3 cylinders is the best number for pulse cancellation.  This is why the turbo F1 cars were v6's.  Same with the z32, supra MKIV etc.  for a I-4 one turbo is best.  If you don't want to do all the work I mentioned above (you did say money and time weren't an issue, what world do you live in???) then just change your compressor and turbine ratio to be more effiecent where you want to be.  Everything is a compromise, but 2 turbos isn't better in this case. __________________ Adam '89 coupe KA24DE+T 14.1 @ 104 MPH '88 Celica All-Trac turbo stock, but no more ecu codes!!

06-01-2002, 02:28 AM	#2
wherezmytofu BANNED Join Date: Nov 2001 Posts: 1,873 Trader Rating: (0) Feedback Score: 0 reviews	im confused...what car u got?...toyota mk2?  <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/confused.gif" border="0" valign="absmiddle" alt='???'>

06-02-2002, 01:36 PM	#7
MarketPlayer Zilvia Member Join Date: Mar 2002 Posts: 251 Trader Rating: (0) Feedback Score: 0 reviews	Instead of going w/ two turbos, use two different kinds of forced induction!  I have been thinking of a way to connect a high powered electric motor to a supercharger and connect it to a toggle switch!  When you need boost right away, then flip the switch and there it is!  This is just an idea and i haven't really spent too much time w/ it but here is how far i have gotten! when the switch is flipped the supecharger will start creating boost!  Therfore you would have to have a pretty good blow-off valve to releave all the built up pressure when you are at idle!  (aren't blow-off valves connected to the throttle body?  therfore when it is closed the valve is open?)  When you step on it the valve shuts and lets maybe 3-5psi in right away to start spooling up the turbo faster!  Once the turbo has spooled up the supercharger can be turned off and let the turbo do the work!  This of course would fit into your, money and time is not an issue, world!  As for how to join the two charged air flows, spearco make a intercooler for dual turbo charged cars, and one inlet can be for turbo and the other for super.  You just have to figure out someway of keeping the turbo chargers pressurized air from escaping through the supercharger!  It is best to draw out this idea, than just read it, but i don't have any place to hoste pictures online!  Good luck! -zac

06-02-2002, 10:37 PM	#8
ridebmx Zilvia Junkie Join Date: Mar 2002 Location: Michigan Age: 41 Posts: 379 Trader Rating: (0) Feedback Score: 0 reviews	if im not mistaken didnt they make something for the mk1 mr2 for a super/turbo setup, i could have swore through all the reading i did when i owned one that i came across something about a supercharger/turbo setup... __________________ I like my car, you may not...You like your car, I may not...To each there own, right? waiting for the sunken look to be cool..lol

06-02-2002, 10:47 PM	#9
Racer X Zilvia Junkie Join Date: Apr 2002 Location: brooklyn park Age: 42 Posts: 334 Trader Rating: (2) Feedback Score: 2 reviews	yes hks made an intake mani with two tracks one for roots blower and the other for turbo and it could switch between the mk1 mr2 scc 02 uscc used this set up it sucked, plus n02 __________________ Twin67 ls1/awd in the works