Hey People...
I got an Mr2 1990 imported from japan with 3sgte Turbo engine and a got a big project...
Im thinking in put Twin turbos. My project consist in put 2 twin turbos T3/04(Garrett .50AR-Compressor, .63AR Turbine, 57 trim) with twin external gates 40mm, also 2 Twin intercoolers one on each side (one in the factory place and the other one opposite side) Intercoolers from rx7 serious 5 87 model...
Well i just wanna ask if some of u guys has ever eard of something similar to my project... And what u guys think about this?
i think u must have lots of money....most ppls would not do the twin turbo conversion simply cuz its too expensive to do....there are only two twin turbo mr2s that i know of that actually exist.....but both are running much smaller turbos (VAIN twin turbo system)....if u go on the main board...search for Pouya...he owns one of the cars....
Personally i think its a waist of money trying to twin turbo a 4 cylinder, one how will you go about mounting the turbos, two you'll get a crazy amount of lag bc a 4 cyl. trying to power two turbos.
if you want a twin turbo mr2, you should look into the v6 conversion then twin turboing that. im getting the v6 single turbo so it should be fast. and the intercoolers its better if you have one in the trunk more air, bigger ic, more boost.
o and if it can be done? nothing is impossible w/ a car as long as the funds are there
a couple people have trunk mounted intercoolers, but unless you plan on putting an air to water intercooler in the trunk, dont bother. an air to air intercooler in the trunk will never get the air flowing through it that it needs to do a decent job. air to water intercoolers offer better risistance to heat soak and provide potentially less pressure drop, but also require a pump and reservoir to keep a constant supply of cool water circulating through it. as for twin turbos... there may be a spooling issue since the turbos are bigger than those which MRQ mentioned, but why would you put two turbos of that size in your MR2 anyways? there are countless single turbo options out there, it all depends on what you want to do with your car. I am interested in this project, sounds like its one of a kind... keep us posted.
I only know of one succesful twin turbo MR2 and the results were hardly worth the effort (in my opinion).
The usual goal of having two sequential is getting low and high end power.
With a 4 cylinder engine, you are better off "twincharging" ... using a supercharger and a turbocharger.
Doing twin turbos, although exotic, will not show major benefits in power delivery over other options and it just makes the whole system much more complex.
Hey Guys
Thanks for all yours post.
Well... This project is not to become the fastest Mr2... I just Want less turbo leg and a quick responce... I know about putting another extra turbo (twin turbo) im not getting more power than single one bigger... In My first project i was think in put a T70 but have beeen seen other cars and the turbo leg is a bit exagerated... My car is a street legal car to cruise and have fun when i want... i got a example of twin turbo conversion... Datsun ute 4 cylinder with corola engine twin turbo doing 9's... what beast. I know isnt as heavies of mr2 but is a 4 cylinder...
And about the intercooler's ill put 2 with the same dimentions or similar of Trust Greddy... one for each turbo...each turbo will push 2 cylinders... Those turbos pool really quick on 4 cylinders they the best for conversions like this one or for small cars... I reckon will get 0 to 60 miles between 4 to 5sec,s and ill be in the 12's 1/4 mile... With 380/420 hp at wheels...
Well if some of u guys got some better ideas and sugesttions....Ill be here for that...
I think what he's trying to say is that you can good power out of ONE t3/t4 turbo.
Aw heck, I'm in the mood for some math!
IIRC the 2nd Gen 3SGTE makes something like 220 hp at 10 psi or so, and it's a 2.0. So, if we want 400 hp, we basically need to increase the airflow by 80%. Let figure out the stock airflow...
10 psi + 14.7 / 14.7 = 1.7 pressure ratio
2.0 liters x 61.02 = 122 CID
I assume that the stock redline on a 3SGTE is 7500 rpm, and volumetric efficiency is 90%...
122 x 7500 x .5 x .90 / 1728 = 240 cfm
240 x 1.7 (stock pressure ratio) = 405 cfm.
405 x 1.8 (airflow increase needed)= 729 cfm to make 400 hp.
729 / 240 = 3.0 pressure ratio, which comes out to 29 PSI!!! Woah! I hope you can get race fuel
729 x 0.074 (weight of air at sea level and 80*) = 54 lbs/min
hello, i understand what you are saying, now i have 2 twin turbo set up of t/3 / t/4 , i believe these turbos are pushing 40% of air flow each this should give me 80% of flow with less lag, being that is 1 turbo working two pistons and the other working the other two pistons, instead of just one turbo flowing 80% via 4 exaust pipes this should cause more lag AND less acceleration response causing lag at bottem end (LOW RPM) ,
i have a study of alot of reading facts with pictures and dyno sheet proof,now when i listen then again there is a lot of dreamers!
i have seen more cars adapting to twin turbo set ups and runing very amazing times such as v8's ,6 straight cylinders , and 4 cylinders, the reason why is horse power and torque graphs on the dyno and torque is rated pushing power creating better times down the line (400mtrs) and keeping a way from that nasty NOS SYSTEM that only causes problems and burn"t engine after a few runs, i have seen the single TURBO application with NOS, NOT RUNNING as good as a TWIN TURBO with no NOS ,Now when we are talking twin turbo with NOS these cars are runing very low times such as high 6's no where near a SINGLE set up with NOS. I UNDERSTAND you know your cars and MATHS very WELL, IM happy to talk to some one, like you that knows your stuff,i have learnt so much, thank you so much and reply my real fact findings.
hello, i understand what you are saying, now i have 2 twin turbo set up of t/3 / t/4 , i believe these turbos are pushing 40% of air flow each this should give me 80% of flow with less lag, being that is 1 turbo working two pistons and the other working the other two pistons, instead of just one turbo flowing 80% via 4 exaust pipes this should cause more lag AND less acceleration response causing lag at bottem end (LOW RPM) ,
i have a study of alot of reading facts with pictures and dyno sheet proof,now when i listen then again there is a lot of dreamers!
i have seen more cars adapting to twin turbo set ups and runing very amazing times such as v8's ,6 straight cylinders , and 4 cylinders, the reason why is horse power and torque graphs on the dyno and torque is rated pushing power creating better times down the line (400mtrs) and keeping a way from that nasty NOS SYSTEM that only causes problems and burn"t engine after a few runs, i have seen the single TURBO application with NOS, NOT RUNNING as good as a TWIN TURBO with no NOS ,Now when we are talking twin turbo with NOS these cars are runing very low times such as high 6's no where near a SINGLE set up with NOS. I UNDERSTAND you know your cars and MATHS very WELL, IM happy to talk to some one, like you that knows your stuff,i have learnt so much, thank you so much and reply my real fact findings.
REGARDS MR2NOJOKE
ED
I know what you're saying there bud, but I think that can be attributed mostly to tuning and sizing. The fact is, you can't have the best of both worlds. If you think you're going to get 400 hp out of a 2.0, then you're going to have no low end power. If you want low end power, then you won't be making 400 hp. Having one smaller turbo and one larger one each being run by only two cylinders is NOT ideal. On a V8 and SOME V6 engines, it is needed, and sometimes even more space efficient, or more desirable to keep the turbos closer to the engine (hotter exhaust gasses).
Corky Bell says that two turbos *CAN* be benificial with engines that flow more than 300 CFM. Since the 3SGTE only flows 240 CFM, it wouldn't be included. However, many factors are involved.
As an example, look at the Supra. When tuning the 2JZGTE, we almost ALWAYS swap the twin turbos for one larger, single turbo for max top end power. It's very rare not to do this.
Granted, it can work, there's no doubt about that and I'm not saying it couldn't. I'm just saying that it will be easier, cheaper, and probably have better results by using one properly sized turbo. For sake of being unique it would be something, but it won't make great low and power AND 400 hp at the same time.
Just for kicks, let's take a look at sizing twin turbos... bear with me since I haven't done this before:
Since we've already made the calculations, I'm assuming that I can just cut the CFM under boost in half, which is 365 x .074 = 27 lbs/min. The pressure ratio I believe remains the same.
Well, after looking at several turbos, I can't find one that will run a pressure ratio of 3.0 and flow that little air. I could be misunderstanding this though, if we can half the pressure ratio then we'd be all set. Perhaps this is the reason that twin turbos are rarely used in high boost, low displacement applications.
Thanks again...
Well what else did u change in your car...? Still a street legal car? How much did u spend on the engine... Your car probably bit lighter then the actullay factory one (1200kg)....
I wanna be in the low 12's but i wanna quick responce im not really worry about the top end... i cant push my car to the limit here in austalia unless i take to the track... but this is a street legal car ... and i drive every single day... i just want the fell the quick... every time i dri ve and every time i stop at traffic lights... and the lights change to green...
Well im open for sugestions but i really need some help... If any one of u guys could me help with this objective Low 12's but a relly quick responce dont worry about top end...
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