I heard that the old 300zx twin turbo came with one small turbo and a larger one, im not sure if this is true, but the idea sounds good. The small turbo spools up really fast and provides boost until the larger one kicks in. Is this how the 300zx works.

I don't think there are any kits out there like this for our G's but I was thinking on piecing together my own turbo system, and i thought this would be a good idea, if it works, i know i have alot of research to do b4 i start buying parts and ripping apart my motor, your help is appreciated

 

I had a 95 300zx and loved that car, but they came with two small turbo's both the same size, I have a buddy who had a Rx7 twin turbo and he tells me they came with one larger and one smaller turbo

 

The 300Z had the same size turbos from what I know.

 

yes...93-95 rx7's were sequential (one small to spool up quickly, and one large for higher boost), but 300's had two that were the same size and kicked in at the same time.

 

can a sequential turbo setup only be done on a rotary?

 

No, it can be done on a piston engine. Correct me if I'm wrong but I believe the MKIV supra came with a sequential turbo system.

 

yeah i just looked at that, the Supra's sequential setup is a little different though, it uses 2 of the same size turbos, and it sends all the exhaust to the 1st turbo and then, based on the load, it goes to the second, something like that its weird, i also read that the Porsche 959 had sequential turbos, but i havent been able to find any more info about it.

 

The new BMW 335i has sequential turbos.

 

Doesn't make sense to put different size turbo's on a V-type engine. The Supra on the other hand has an inline-6 motor and from what I was told does have the sequential type turbo system, one bigger than the other.

300ZX TT = V-type
Supra TT = Inline-6

Hope that helps.

 

yeah, the 335i is a nifty setup it has 2 small turbos, with virtually no turbo lag, the car reaches peak HP, like 306hp, @ 1400RPM then flat lines all the way, its pretty cool.

But the setup i want to do it to have a large turbo where i can get some good HP, but since its so large it will have lag, and i wanted to fix that by using a small turbo, so off the line the car would run off the small turbo, untill the big one kicked in and eventually takes over.

If u look at the 335i, it uses the 3.0l engine found in the 330, but turbo it, only adding about 47hp if i remember reading correctly, if i turbo i want it to be more than 47 ponies

 

i'm pretty sure you can only put sequentials on inline or rotarys. the positioning of the turbos in sequence wouldn't work with a v-engine. each bank of cylinders would not be able to feed separate turbos...it wouldn't make sense to have them boost at different pressures.

 

well, what if i did it smilar to a single turbo set up, where the turbo takes exhaust from both manifolds, one on each bank of the V, and then split it again?

 

Sounds like a lot of expensive custom work to me. The best thing you can really do is get a good exhuast system to alleviate the back pressure so the turbo's can spool up quicker, but hey im no expert. I believe superchargers produce a smoother power band; might want to look into that.

 

It might reach peak TORQUE at 1400RPM, but reaching peak HP at that number of revs does not jive:

bhp = torque x rpm/5252
306 = torque x 1400/5252
torque = 1148

1148 lb-ft of torque? Errrrrrrr....... no

 

Sorry my bad, i meant peak TQ not HP