Is it possible to have to different kinds of turbos on a twin turbo setup. Say the first turbo is bigger than stock but spools quickly, then the second turbo be even bigger for maximum HP. Since the second turbo will have been spooling already it should lag right?

 

isn't this how it is stock? isn't that what they mean by sequential turbos....?

edit: nm, i'm confused.

 

the stock turbos are both the same size. They are both Hitachi H12 turbos i believe

 

They are Both HT12's The cosmo 13b-rew has HT10's for more TQ. A couple of companys do this like BNR super cars at the top of the page. The results for these mods aren't that great or alot more poeple would be doing it. biggest problem is you can't put a larger compressor wheel because the shaft is to thin. Or at least thats the common complaint.

 

I know that they are the same turbos, what I was wondering is if it is possible to put 2 different turbos on, the 1st being for a quick spool and launch, and the 2nd to push the rpms and hp up.

 

I think what RX-7s do is have the same housings, but different fin patterns. I think that would be the best idea for what you want to do. I supposed it would be possible to do what you are asking, but it would take a lot of effort.

 

So let's get this straight, what you want is a twin-turbo set up that functions exactly like the stock set up but pushes more air? Sounds like a BNR upgrade or an M2 ball-bearing upgrade.

How much hp are you looking for, because the stock twins are capable of 320-340 rwhp without straining them too hard. Otherwise that new Apexi RX-6 looks good for a small single. I think Max Cooper is running that turbo. Artguy and Captain Bill are both running the M2 ball-bearing turbos, I believe.

 

I guess I really didnt explain what I meant properly. What I was wondering is if say, I had say a T04e for the first turbo and a T04R for the second. These turbos are just ones that I thought of right away, but I think you get my point. Putting a Faster smaller turbo 1st, then a bigger more lag turbo second. Maybe I am smoking too much crack to figure this out. Just kidding.

 

Uhh.. well you would have a hard time spooling a TO4E and a TO4R together, a TO4R would be hard enough on a stock port.. full boost at like 5500-6000rpm. A TO4E is not something I would call 'small', you can squeaze a good 400rwhp out of one. To answer your question anything is possible with enough $$$.. I think you would cross the line where the dollar amount invested would not make sense very quickly on a task like this. Your best bet for upgraded sequential twins is with a BNR upgrade.

Matt
93 SSM

 

How about running the stock 1st turbo, and then the T04r for the 2nd turbo.

 

That's ridiculous, talk about David and Goliath. It sounds impossible to set up sequentially just because of how long it takes to spool a TO4R, seriously that is a BIG turbo.. like a drag racing turbo.. not a sequential setup street type turbo. Your best bet if you want better low end response on a turbo that big is nitrous.

Matt

 

Not to mention the custom manifold your going to have to make custom cause no one else has a set up like that.

How much power you looking for?

 

I just thought that the 1st turbo spools up the 2nd turbo. And that rpms would be high enough for the T04R to begin making boost. I dont know. Maybe I will just go single To4r. Off this subject, is a bridgeport streetable? Some say yes, some say no. I have a street port now. But just wondering, thought about building new engine.

 

The first turbo does not spool the second, the exhaust flow is just directed at the first turbo until transition.. then a small amount is redirected to the second for a prespool, then at 4500RPM bam second turbo comes on with both turbos receiving exhaust flow. That is a very simplified version of what happens..

To determine which turbo to run first outlay what you want to do with the car, what sort of lag is acceptable to you, etc. A bridgeport is not what I would categorize as streetable. If you run a bridgeport with a TO4R your car will suck to drive on the street, it will be an absolute dog below 4500rpm. A car with that setup is really strictly a track only drag setup in my mind, a 1/4 mile car basically. But when that turbo hits it will feel like someone hit a lightswitch, very on/off feeling.

Matt