A&Q about 350Z
The boost from twin turbo setups is usually much more tame and smooth. That is the reason why almost all the higher end turbo cars; the z, supra, rx-7, vr4, skyline gtr,etc.; have twin turbos. It can also be hard to fit a single turbo setup in a cramp 6 cylinder engine bay because of the exhaust piping. When you get to significantly higher than stock power levels, the 'smoothness' element doesn't seem to matter anymore.
My TT beauty is gone.
22 Honda 954RR
Suzuki 1200 S; sportscar eater
19[I4]94 Integra GSR Sedan
Long live the Z...
Doesn't the 350z have only one throttle body? I thought that the turbos could be different or same sized. Smaller turbo for low rpm spool and larger usually for the high end. Both turbos would push through the intercooler and then into the single throttle body. I don't think one turbo for each three cylinders is correct, I many be wrong. Anyone?
2004 Pike Peak Touring AT
the 3000gt/steath tts run the same turbo on both sides and are single intake/throttle body
check out z1motorsports they have done both to a few cars now and i think there is a write up in there faq
93 z32 convertible=pearl white, 5 speed
jwt pop-charger, hks hypers, asp underdrive pulley
86 z31 na=super white, 5 speed
not that this should be posted in this topic becase it is kinda off topic... but from what i hear the Borla TD exhaust isn't all that favorable due to the number of pieces... not that it would be terribly difficult to assemble it's just that there are now more places for a possible leak... not good... so i pass the advise that was given to me... keep looking for a package such as Injen, APS, Nismo(?) or the like that doens't have so many connections...
(?) notes that i don't know if it has alot of parts or not...
Chrome Silver '03 Touring -MT-
C.F. Nismo Wing
Shorty Antenna (Stolen!!! Thanks alot!)
Kicker Solo Baric L7 1200w
I don't think, I know...
Well, I don't think you know either
The Borla is too loud as well. My friend has it on his 350Z and its sounds too... ricey.
1985 300ZX n/a
Either single or twin T if set up right are a real blast and incredibly FUN. I have vacillated back and forth with this decision and finally settled on twin turbos. With me it finally came down to, if you have the money, go twin turbo. If on a lesser budget, go single. Our 350Zs accelerate like a rocket sled with either if set up right. All good.
Post Edited (Dec 17, 8:37pm)
"Usually you see sequential turbos on an inline 6 or the Mazda rotary engines. I am not familiar with any sequential turbo kits for the 350Z. Our VQ is so torgy at low RPMs and with 10.3 compression, engine response and boost with TTs is there and that right quick, ha. I think that the best twin turbo kits spool so fast for the 350Z, that it is felt that sequential turbos are really not needed. Might be more complicated on our V6 setup; I haven't really looked into it though so I won't knock it. But like I said, sequential is an interesting concept and someone should try it with the 350Z if it hasn't been done already. If anyone has info on seqentials already done, I'd love to hear about it."
Yeah, as far as I know, there aren't Sequential turbo "kits" for the 350Z. You'd have it custom made for you, but the benefits could be astounding. With a stock Compression of 10.3:1, you'd only be able to run a maximum boost pressure of 12-16 before you require the use of racing fuel. But honestly, with a 10.3:1 + about 10-12lbs of boost, you'd be pushing the limits of efficiency anyways. Any beyond the 12psi point and you'll just be generating more heat than power and stressing the bottom end greatly.
If you drop the CR though, you'll hamper the engines performance before boost kicks in, as well as causing the turbo lag to be slightly longer than with the 10.3:1. You'd also have to run more boost to get the same power, which will only further increase your lag time, and higher boost setups are more stressful for engines. My philosophy has always been high compression+lower boost as opposed to Low compression+higher boost. Higher boost will heat the intake charge more, increasing the likeliness of knock/detonation, and putting more stress on the engine. If you can make the same power with 10.3:1+12psi as you could with 9.3:1+18psi, I would go the lower boost route.
I know the bottom end on the 350Zs are plenty strong, I've seen some people pushing 650HP without touching the bottom
1985 300ZX n/a
You and I are very close in our thinking. Yes, I don't like to drop compression either. Dropping CR hurts off boost performance, engine/boost response and all the things you say and also hurts gas mileage. When I eventually build the bottom end of the engine, I was only going to drop compression down to about 9.3 or 9.5. Instead of to 8.5 or so like a lot of people advocate. I am still thinking that through. Building the engine is still several years away for me.
I also know of someone running well over 500 hp to the wheels on the stock internals 350Z engine with the APS turbos. Actually I know several people. When you mentioned 650 hp, if you are talking about 650 hp at the engine, then we are saying about the same thing. 520 hp at the wheels (like my friend is running) translates to about 627 hp at the engine. Again, he is using stock 350Z engine internals. You would be surprised at the number of people on this website, a while back, who got all hysterical and said real nasty things to me when I discussed such power levels on the stock engine internals. APS and others recommend building the engine bottom end if going over 400 wheel horsepower for maximum engine longevity - which is about 482 hp at the engine. But it is the APS dealer that I will be going to who has been running well over 500 wheel HP or about 650 hp at the engine on stock 350Z engine internals. Power levels like you discussed.
Several guys I know have been running these power levels for over 25,000 miles now with no problemos on stock 350Z engine internals. I don't post much about that on this website because some of the punk kids on this website who know little to nothing about forced induction bad mouth me and go nuts. Mostly because they are anti 350Z trolls who come around this website and they like to kick sand in the face of 350Z owners regarding their own beloved stock supercharged mustang cobras and 300 ZX TTs. I have told other 350Z owners - don't get angry about stock mustang cobras running the much less efficient roots style eaton supercharger on a stock cobra, just get a good turbo setup on your 350Z and blow the stock mustang cobra's doors in, ha. Oh boy, these trolls start cursing and ranting and getting threads deleted. They even used racial slurs when they don't even know the race of the persons with whom they are speaking. And the more they post the more I see that they know very little or nothing about forced induction. I have won first place in national level turbo drag races and been running turbos for about 20 years. It is useless for me to argue with some of the anti 350Z kid trolls on this website who know nothing about forced induction - other than they hate 350Zs and get frustrated that their cars can't kick sand in my face like they have been enjoying doing on this website.
Now don't get me wrong. I am a big fan of the old 300 ZX TT, just not a fan of these particular jerks who insist that a 350Z can't run boost on stock internals without blowing the engine. I am really not even putting down the Mustang Cobras. Only the trolls. The supercharged Mustang Cobra is a very fast car. Just too heavy for my preferences. Not exactly a nimble sports car. Actually I wish my 350Z were a bit below 3000 lbs. for that matter. It is a nice experiece disussing forced induction with someone such as yourself who knows about the subject.
I personally know a guy running about 650 horsepower to the wheels on his 350Z with a built engine or about 784 hp at the engine with a modified Greddy twin turbo kit. But one better have good tuning and a real good fuel system to do that. The Greddy kit does not have a good fuel system stock but it can be upgraded and do just fine if you know the right components to use.
I will be running on stock 350Z internals at about 11 PSI. And with my set up, tuned conservatively regarding timing, and also a bit on the rich side, that should translate to between 450 to 500 hp to the wheels - which is approaching 600 hp at the engine. Won't know all the details till we put it on the dyno. I am really being pretty conservative with my power figures and set up, but these trolls scream that I am outta my mind. If ignorance were money, these people would dwarf Bill Gates, ha. They just hate 350Zs and don't like aknowledgeing that stock engine 350Zs can succeed with boost. If there were mature moderators on this website, which there aren't, they would ban the name calling trolls, like Ven100, and "The Big One" (more like "Bit the big one" ha), but they just delete the entire threads instead. Ven is not a kid, he is an ignorant old coot who admits that he doesn't even own a 350Z. So why was he on this website other than to troll? So I don't post here very much. There are a few guys who know forced induction with 350Zs here, but often you can't have an intelligent discussion because of the anti 350Z trolls show up and the moderators won't do the right thing. Just wanted you to know that is the case. Seems some of these trolls don't post as much here anymore but I'm not sure they have fully crawled back under their rocks for sure either, ha.
Yes at some point you do run an amount of boost that takes you out of the turbos efficiency range of the given turbo charger. The new technology Garrett GT series turbos I'll be using can run up to around 16 to 18 psi with the 350Z and not run out of their efficiency range. I am also a fan of not going crazy with the boost levels.
Vinny Ten has a 350Z drag car that was running 33 psi of boost on twin turbos, Carrillo rods, and better pistons. Last winter he was at about 1300 horsepower to the wheels or over 1500 horsepower at the engine. I posted a video here where the car ran 8.3 sec. qtr at 176 mph. Much of that engine, other than the rods, pistons and wrist pins, is still stock internally. Amazing. Vinny is the famous "Mr Supra" who now has converted over to the 350Z continuum, ha. Course at his competition level, he can afford to rebuild the engine a lot if he has to. I can't, alas. So I go conservative.
Post Edited (Dec 18, 8:09pm)