# Twin Turbo SR20? **URL:** \ **Category:** SON240sx Automotive\ **Created:** [December 28, 2004, 12:09pm UTC](https://forums.speedlife.net/t/twin-turbo-sr20/82683 "2004-12-28T12:09:37Z")\ **Posts on this page:** 20\ **Page:** 2
**Author:** ![TM1](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/tm1/32/5517_2.png) [@TM1](https://forums.speedlife.net/u/TM1)\ **Post date:** [December 29, 2004, 12:18pm UTC](https://forums.speedlife.net/t/twin-turbo-sr20/82683/21 "2004-12-29T12:18:02Z")
> [@ADAM](#): > > i think lag is overrated …though i would opt for a larger single turbo than twins unless i had a V engine > > my very large .84ar turbine is laggy if i was on the street…however once the car is running and you are actually on the gas (aka racing the car) lag is almost a non issue since the turbo is almost spooled all the time…in fact when its not its just blowing off excess boost until you hit the throttle again… > > i love the new much larger turbine…it makes the car way easier to drive …and way less twitchy…plus it comes on really strong top end…and you get the benifir of being able to run a large compressor that is very efficient…which is key versus smaller heat blender turbos…here is a pic of the difference between the .63ar and the .84ar…and the .63ar is not a small turbine either…vs your t2 series which are even smaller 🙂 > > [/img] I rest my case on the lag issue… Thanks Adam… ---
**Author:** ![Solarian](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/solarian/32/5514_2.png) [@Solarian](https://forums.speedlife.net/u/Solarian)\ **Post date:** [December 29, 2004, 12:48pm UTC](https://forums.speedlife.net/t/twin-turbo-sr20/82683/22 "2004-12-29T12:48:06Z")
Sweet jesus on a stick… that’s a big snail. ---
**Author:** ![Cal](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/cal/32/5505_2.png) [@Cal](https://forums.speedlife.net/u/Cal)\ **Post date:** [December 29, 2004, 3:54pm UTC](https://forums.speedlife.net/t/twin-turbo-sr20/82683/23 "2004-12-29T15:54:49Z")
it is so fast that it needs 4 hood pins…and that guy in the pic seems to be very attracted by one of them ---
**Author:** ![ADAM](https://avatars.discourse-cdn.com/v4/letter/a/4af34b/32.png) [@ADAM](https://forums.speedlife.net/u/ADAM)\ **Post date:** [December 29, 2004, 9:05pm UTC](https://forums.speedlife.net/t/twin-turbo-sr20/82683/24 "2004-12-29T21:05:43Z")
another added benifit of the much larger turbine is the overall heat rejection to the system it adds which is very great…i lost 100deg c+ on my EGT’s from the much free’r flowing turbine…another angle of teh larger housing ![http://www.turbo240sx.ca/newturbo6.jpg](http://www.turbo240sx.ca/newturbo6.jpg) ---
**Author:** ![canadiandrifter240sx](https://avatars.discourse-cdn.com/v4/letter/c/5daacb/32.png) [@canadiandrifter240sx](https://forums.speedlife.net/u/canadiandrifter240sx)\ **Post date:** [December 29, 2004, 10:54pm UTC](https://forums.speedlife.net/t/twin-turbo-sr20/82683/25 "2004-12-29T22:54:33Z")
Lag may not be a big problem on a single turbo of that size but put 2 of those together on a 2.0l engine and you have a show car. While it may be drivable it is not going to be as good as a single turbo of that size. 2 turbos of a smaller size can be better then 1 but the turbo’s on that car are huge. Even for drag raceing, the tjztt’s that i have seen drag raceing have gone to a single large turbo as aposed to the 2. ---
**Author:** ![system](https://canada1.discourse-cdn.com/flex034/uploads/speedlife/original/2X/b/b7170c8eddc0b95ece6b88172b2f416a08489a45.png) [@system](https://forums.speedlife.net/u/system)\ **Post date:** [December 29, 2004, 11:40pm UTC](https://forums.speedlife.net/t/twin-turbo-sr20/82683/26 "2004-12-29T23:40:47Z")
When it comes down to it 1 or 2 turbos are great. it just depends on the application. you can make one better then the other for any situation. There are no real winners jut weeners ---
**Author:** ![TM1](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/tm1/32/5517_2.png) [@TM1](https://forums.speedlife.net/u/TM1)\ **Post date:** [December 30, 2004, 3:20am UTC](https://forums.speedlife.net/t/twin-turbo-sr20/82683/27 "2004-12-30T03:20:55Z")
> [@canadiandrifter240sx](#): > > Lag may not be a big problem on a single turbo of that size but put 2 of those together on a 2.0l engine and you have a show car. While it may be drivable it is not going to be as good as a single turbo of that size. 2 turbos of a smaller size can be better then 1 but the turbo’s on that car are huge. Even for drag raceing, the tjztt’s that i have seen drag raceing have gone to a single large turbo as aposed to the 2. That’s fine but i think the velocity stacks on those turbos make it look bigger then it actually might be. Also as an unwritten rule, the guys who want 3-700 hp generally run a single turbo setup on most TT motors RB and JZ included… 700hp + normally stick with twins… ---
**Author:** ![TorontoGT-R33](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/torontogt-r33/32/5500_2.png) [@TorontoGT-R33](https://forums.speedlife.net/u/TorontoGT-R33)\ **Post date:** [December 30, 2004, 10:41am UTC](https://forums.speedlife.net/t/twin-turbo-sr20/82683/28 "2004-12-30T10:41:12Z")
Personaly I think a TT looks great and all and as Bruce said it’s looks great for show, but I would personaly stick to a single turbo done right. If I had money to waste and I wanted to be different then I goes a TT would be a prety cool project and all but I still believe one turbo done right is better. I think what it all comes down to again is just how much time and money you are willing to put into it and a single turbo done right with the right upgrades is still more economical then a TT and less time to set up and easier to set up, but if you know what you are doing and have the money to do it then hey why not a TT. Once again it all comes down to personal preference. It’s like arguing about SR’s and RB’s and KA-T’s etc. There is no end to it… You just got to do what you like and hope it works the way you want and that’s it! ---
**Author:** ![ADAM](https://avatars.discourse-cdn.com/v4/letter/a/4af34b/32.png) [@ADAM](https://forums.speedlife.net/u/ADAM)\ **Post date:** [December 30, 2004, 11:26am UTC](https://forums.speedlife.net/t/twin-turbo-sr20/82683/29 "2004-12-30T11:26:41Z")
they make some awfully big turbos…that can support upwards of 800rwhp per single turbo (i have one sitting at the shop ) i still think that unless its a plumbing issue like a V engine a single is the way to go…less parts = more reliable… and in the case of a small displacement engine IMO there is no valid reason to go twin turbo at all…other than looks… ---
**Author:** ![TM1](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/tm1/32/5517_2.png) [@TM1](https://forums.speedlife.net/u/TM1)\ **Post date:** [December 30, 2004, 11:38am UTC](https://forums.speedlife.net/t/twin-turbo-sr20/82683/30 "2004-12-30T11:38:06Z")
> [@ADAM](#): > > they make some awfully big turbos…that can support upwards of 800rwhp per single turbo (i have one sitting at the shop ) > > i still think that unless its a plumbing issue like a V engine a single is the way to go…less parts = more reliable… > > and in the case of a small displacement engine IMO there is no valid reason to go twin turbo at all…other than looks… While it may not be a valid reason, it doesn’t mean it useless, or can not be set up to be comprobable to a single turbo setup if it’s done right… It’s not useless, it’s different… ---
**Author:** ![boMex](https://avatars.discourse-cdn.com/v4/letter/b/7bcc69/32.png) [@boMex](https://forums.speedlife.net/u/boMex)\ **Post date:** [December 31, 2004, 10:52am UTC](https://forums.speedlife.net/t/twin-turbo-sr20/82683/31 "2004-12-31T10:52:07Z")
> [@TM](#): > > [quote=ADAM]i think lag is overrated …though i would opt for a larger single turbo than twins unless i had a V engine > > my very large .84ar turbine is laggy if i was on the street…however once the car is running and you are actually on the gas (aka racing the car) lag is almost a non issue since the turbo is almost spooled all the time…in fact when its not its just blowing off excess boost until you hit the throttle again… > > i love the new much larger turbine…it makes the car way easier to drive …and way less twitchy…plus it comes on really strong top end…and you get the benifir of being able to run a large compressor that is very efficient…which is key versus smaller heat blender turbos…here is a pic of the difference between the .63ar and the .84ar…and the .63ar is not a small turbine either…vs your t2 series which are even smaller 🙂 I rest my case on the lag issue… Thanks Adam…[/quote] In Adam’s case lag isn’t an issue, however his car is purpose built to put the hurt on in Solo 1 competition. Most of the people on the boards are going to street drive their turbo cars and on the street lag is a major pain. I would much rather have a little more low end grunt for when I need to hit a gap in traffic. Any car that will be used to pick up the grocceries will benefit from a powerband that starts to pick up somewhere south of 4000rpm. ---
**Author:** ![ADAM](https://avatars.discourse-cdn.com/v4/letter/a/4af34b/32.png) [@ADAM](https://forums.speedlife.net/u/ADAM)\ **Post date:** [December 31, 2004, 1:10pm UTC](https://forums.speedlife.net/t/twin-turbo-sr20/82683/32 "2004-12-31T13:10:18Z")
thats true…though i cant in my mind give up top end power to have low end grunt…it only shifted up the boost by 500rpm or so here was a dyno at 14psi… (actually 12 with 2 psi boost creep) so lets shift it up by 500rpm…at 3000rpm i had 200ftlbs torque…how much of a biggi is it to have the 200ftlbs at 3500rpm 🙂 i have not dynoed the car yet with the new turbine but i expect big power gains from it top end… i mean…who is lugging thier engine down at 3000rpm? when you want to move you down shift…and voilia lag is pretty much gone 🙂 and when you downshift you most likley are putting the engine in the 4500rpm or slightly higher range…which nets me close to 323ftlbs 🙂 which is alot of grunt in that small car 🙂 ![http://www.turbo240sx.ca/dyno2may803.jpg](http://www.turbo240sx.ca/dyno2may803.jpg) ---
**Author:** ![TM1](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/tm1/32/5517_2.png) [@TM1](https://forums.speedlife.net/u/TM1)\ **Post date:** [December 31, 2004, 6:56pm UTC](https://forums.speedlife.net/t/twin-turbo-sr20/82683/33 "2004-12-31T18:56:58Z")
> [@boMex](#): > > [quote=TM][quote=ADAM]i think lag is overrated …though i would opt for a larger single turbo than twins unless i had a V engine > > my very large .84ar turbine is laggy if i was on the street…however once the car is running and you are actually on the gas (aka racing the car) lag is almost a non issue since the turbo is almost spooled all the time…in fact when its not its just blowing off excess boost until you hit the throttle again… > > i love the new much larger turbine…it makes the car way easier to drive …and way less twitchy…plus it comes on really strong top end…and you get the benifir of being able to run a large compressor that is very efficient…which is key versus smaller heat blender turbos…here is a pic of the difference between the .63ar and the .84ar…and the .63ar is not a small turbine either…vs your t2 series which are even smaller 🙂 I rest my case on the lag issue… Thanks Adam…[/quote] In Adam’s case lag isn’t an issue, however his car is purpose built to put the hurt on in Solo 1 competition. Most of the people on the boards are going to street drive their turbo cars and on the street lag is a major pain. I would much rather have a little more low end grunt for when I need to hit a gap in traffic. Any car that will be used to pick up the grocceries will benefit from a powerband that starts to pick up somewhere south of 4000rpm.[/quote] That’s personal preference, and like Adam said, change gears if you want more… ---
**Author:** ![boMex](https://avatars.discourse-cdn.com/v4/letter/b/7bcc69/32.png) [@boMex](https://forums.speedlife.net/u/boMex)\ **Post date:** [January 1, 2005, 1:19pm UTC](https://forums.speedlife.net/t/twin-turbo-sr20/82683/34 "2005-01-01T13:19:26Z")
Adam, what’s your lag like in a roll on situation? I know it took me a little while to get used to the car after I swapped to the FMIC. The SMIC was nearly lag-less while the FMIC adds in a fair bit of slop to the system. ---
**Author:** ![ADAM](https://avatars.discourse-cdn.com/v4/letter/a/4af34b/32.png) [@ADAM](https://forums.speedlife.net/u/ADAM)\ **Post date:** [January 1, 2005, 1:22pm UTC](https://forums.speedlife.net/t/twin-turbo-sr20/82683/35 "2005-01-01T13:22:58Z")
like a roll on from 1k rpm or something like that… HUGE lag…it takes forever to get power to come on… though once you get around 3k it starts to really jump… ---
**Author:** ![boMex](https://avatars.discourse-cdn.com/v4/letter/b/7bcc69/32.png) [@boMex](https://forums.speedlife.net/u/boMex)\ **Post date:** [January 1, 2005, 1:28pm UTC](https://forums.speedlife.net/t/twin-turbo-sr20/82683/36 "2005-01-01T13:28:10Z")
Sorry should have been more specific. I was meaning from like a 2500rpm light throttle cruise to WOT. Like you would use to hit a gap in traffic or something like that. ---
**Author:** ![ADAM](https://avatars.discourse-cdn.com/v4/letter/a/4af34b/32.png) [@ADAM](https://forums.speedlife.net/u/ADAM)\ **Post date:** [January 1, 2005, 2:07pm UTC](https://forums.speedlife.net/t/twin-turbo-sr20/82683/37 "2005-01-01T14:07:16Z")
ohhh… well the car has gobs of torque by 3k so …no its not an issue…it rolls on at that RPM pretty good… ---
**Author:** ![boMex](https://avatars.discourse-cdn.com/v4/letter/b/7bcc69/32.png) [@boMex](https://forums.speedlife.net/u/boMex)\ **Post date:** [January 1, 2005, 3:04pm UTC](https://forums.speedlife.net/t/twin-turbo-sr20/82683/38 "2005-01-01T15:04:52Z")
Of course I could solve all my trouble by buying one of these: ![http://www.ford.ca/english/images/showroom/FordCars/Mustang/exterior/ss_ext4.jpg](http://www.ford.ca/english/images/showroom/FordCars/Mustang/exterior/ss_ext4.jpg) mmmmm detroit muscle with a helthy healping of low end grunt I really do think that I will own one of these someday ---
**Author:** ![ADAM](https://avatars.discourse-cdn.com/v4/letter/a/4af34b/32.png) [@ADAM](https://forums.speedlife.net/u/ADAM)\ **Post date:** [January 1, 2005, 3:07pm UTC](https://forums.speedlife.net/t/twin-turbo-sr20/82683/39 "2005-01-01T15:07:17Z")
i think they look waayy better now ---
**Author:** ![AnDrEw](https://avatars.discourse-cdn.com/v4/letter/a/f19dbf/32.png) [@AnDrEw](https://forums.speedlife.net/u/AnDrEw)\ **Post date:** [January 1, 2005, 3:53pm UTC](https://forums.speedlife.net/t/twin-turbo-sr20/82683/40 "2005-01-01T15:53:06Z")
> [@ADAM](#): > > i think they look waayy better now I agree, the pictures don’t do them justice either. Maurice showed me some at a dealer last weekend. They look so nice in person. Andrew. [Previous page](https://forums.speedlife.net/t/twin-turbo-sr20/82683.md?page=1) [Next page](https://forums.speedlife.net/t/twin-turbo-sr20/82683.md?page=3)