Twin Turbos...Is It Possible?

[Anonymous]

i know i know, twins are a bit overkill, but they would provide more uniqueness than just a single not to mention more power. i realize that fabbing up a TT header would be alot harder than a single but it can be done. turbo choices, i woud probably use some 9B's off of the mitsubishi 3000GT VR4/ Dodge Stealth RT/TT. then some DSM sidemount intercoolers. i was just wondering if anyone was working on a TT setup since i know that they cost more and are more complex but its just something to think about. you could probably source a bunch of the parts of a 3S car anyways.

 

[StrangeRanger]

The trick would be finding small enough turbos. Since your engine is a low-revving 3.3 litre, you'd need a pair from single turbo 1.5 litre engines or a pair from a twin turbo 3.0. What you get in return for greater complexity is a reduction in inertia and a slight reduction in turbo lag. Of course, if you start with the right turbo, lag is fairly minimal anyway...

 

[hasa68mustang]

the 3000 gt ones are a little bit smaller motors 3.0l, but rev way the hell higher than ours. I thought about doing this but just decided one would be better.... but 2 would be cool! oh some civics come with 1.5l motors...

 

[Anonymous]

Mitsubishi 3000GT VR4's have 9B's. with a down pipe and open exhaust lots of the members on a forum i go to complain that they spool up TOO quickly (2k-2.5k) rpms. they hold around 14 psi safely and are for their 3L motors. maybe when i become rich i will slap a pair on a 200ci. lol.

 

[wallaka]

Yep. Anything's possible with the right amount of $$$$. I was thinking about this myself but there are space issues to think about. Like the space I want the turbos to be is also the space I want my shock tower to remain. I believe I'll be going with a single. With the right adaptor for the stock manifold, the right starter (and heat shield), and with the turbo clocked just right I should still be able to run A/C, which is important in the South. Well, it is to me. This won't be a track only job, I want a fast daily driver which takes a bit more thought.

 

[Anonymous]

ya the space was an issue in my plans but the 9b's are tiny lil things. maybe when i get a hold of another i6 (probably have to be a 67+ to fit the things) and about 10k ill do it. then make the 200 rev to 7k rpms also. hell if they can make diesel trucks run 10's i can put twin turbos on a mustang.

 

[hasa68mustang]

hell if they can make diesel trucks run 10's i can put twin turbos on a mustang.

ok twin turbos on a mustang, I'll put money on that sayign its already been done... ok now moderators I'm not betting and hijacking AGAIN, but anyway I think its a safe bet to say someones done it, but this would be an inline 6!!! which few people even keep in their cars!

 

[Anonymous]

yeah, i hope he's talking about putting twin turbo's on a L6 mustang, cause i know it's been done on vee-eights

 

[xzerokidx]

I would also check out the supra and rx-7 twin turbos...

On a sequential turbo setup you would only have to run the exhaust manifold into the first turbo, which is smaller to spool up the larger second turbo quicker.

 

[wallaka]

The turbo has to be powered by something. Exhaust gas is needed for both turbos, just in a sequential setup the output from one is routed to the input of the other. That is not needed in this setup. I doubt that he will want to run over 15-20 lbs. of boost. A sequential rig with reasonable sized tubos is made for much higher pressures than that. BTW, the Rx-7's setup made about 10 psi at WOT because the turbos were tiny Hitachi HT12s. But it was extremely responsive over the 13B's huge rpm range. With the breathing capabilities of our engines (or lack therof), a parallel setup would be much more appropriate. I believe the Supra TT setup would be much more reasonable.

 

[Anonymous]

Some guys in Ozzy fitted two Nissan VG30DE-T Turbo's (early Fairlady 300ZX) onto a OHC engine - It was amazing!

 

[Anonymous]

yes i meant an i6...lol. the supra runs a sequential setup too doesnt it? if i did do it i would probably not run a whole lot. just enough to own a few supras.

 

[Anonymous]

Sequential turbos still have their problems......

And the supra system is a very complexly activated system that would be extremely difficult to duplicate on a Ford I-6.

Get a BB turbo if you are willing to spend that kind of money anyway.
A well designed single set up will probably outperform a twin set-up and be cheaper and simpler to set-up.

 

[Anonymous]

i didnt want a sequential setup, i originally said that i wanted to run a true twin setup using mostly parts off a 3000GT VR4, such as, their 9B turbos, sidemount intercoolers, etc. some people said no, because they rev higher. well if i could get the engine to rev to 6k rpms, then that wouldnt be a problem since the 9B's coupled to an open exhaust will hit full boost by 2.5k at the latest. the turbos are small, so they should fit. again, this is all just a pipe dream right now. i know a single has its advantages, but we have done single, i wana see a twin setup making 350hp. lol.

 

[Mustangaroo]

IT ONLY TAKES MONEY! YOU CAN MAKE 400 HP WITH A SINGLE TURBO ON OUR SIXES! IT WON"T DRIVE DOWN THE STREET VERY WELL BUT AT THE DRAG STRIP IT WILL FLY!

 

[xzerokidx]

IT ONLY TAKES MONEY! YOU CAN MAKE 400 HP WITH A SINGLE TURBO ON OUR SIXES! IT WON"T DRIVE DOWN THE STREET VERY WELL BUT AT THE DRAG STRIP IT WILL FLY!

You could always turn boost down while driving around the city , 5+/- psi of boost on a built turbo motor will still run quite nice on the stree, but the smile won't go from ear to ear during acceleration.

 

[Anonymous]

dude, that makes NO sense. how could you not drive a 400hp car down a street if all you are doing is adding power to the original motor. lets say you are making 180hp to the wheels on a regular 200 cid inline 6. thats all motor, nothing extra. you strap on a single turbo.....how much boost would you need for 400hp? around 15 psi. FYI, 15 psi on a ball bearing turbo isnt that much, in fact it is very driveable considering you have a streetable car to begin with. and as previously mentioned, thats why turbos are so awesome, you can control the power with the turn of a knob on your boost controller.

 

[Mustangaroo]

How are you going to control the timing at 15-20 lbs psi and if you use a blow thru carb it will be very rich at idle and low rpm in order to run 400 hp without melting the engine from detonation from a lean mixture! I'm not saying all this can't be done but if you think it's so easy why isn't everyone doing it! Keep in mind most if not all the cars ripping up and down the road with turbo's all have computer controlled electronics, and that my friend make a very big difference in how it drives on the street with that much power! Not trying to bust your dreams but get real, if you have $5,000 to spend on that setup, of course that's you doing all the labor as no shop is currently building such a 200 six for the street, and all the problems have to be worked out by you via trial and error, it can happen but it's not an easy build to do for a novice mechanic. Good luck , but please read and learn all you can as the mistakes are costly.

 

[Anonymous]

Well, I am not at 400 HP, but at 20 psi...

How are you going to control the timing at 15-20 lbs psi

I have the mechanical timing advance in the distributor stock, untouched. Still set at what the engine was timed at when I pulled it from the parts car. Haven't had a timing light on it yet. No vac advance hooked up.

and if you use a blow thru carb it will be very rich at idle and low rpm in order to run 400 hp without melting the engine from detonation from a lean mixture!

Hmm....I take alot of notes from the turbo V8 mustang guys, I don't see any problem at all if the carb work was done right. Bryan Sharer was running high 9's on a stock Holley 600, and Ira (rotoryota) is running 8's (in the 1/4!) on a stock 650 DP, no prep work done (amazing....)

 

[Mustangaroo]

Bryan Sharer was running high 9's on a stock Holley 600, and Ira (rotoryota) is running 8's (in the 1/4!) on a stock 650 DP, no prep work done (amazing....)

Yes! But how well did it drive down to the local store on a hot day? And next week when you toast your engine, you'll be lucky you don't have alot invested in that setup. I hope you have a chance to properly tune it before she let's loose, it is usualy recomended that you do not exceed 27* advance on a boosted engine then you detune it from there if your not running the proper grade fuel for your setup. Unless your distrubitor is broken it advacining about 34-38 degrees in stock form. Not trying to start you guys up, hell I hope all of you build your dream engine and it doesn't blow! But from what I've read from your posts it looks like it will be just a matter of time before she blows...............................................