DC350

I have seen a few peoples names that are proud to be turbo free, or something along those lines. Please let me know what you think about why not to get a turbo. I can't think of any...maybe just lower hp at low revs? Whats your opinion.. Thanks!

rico05

Turbo=inceased internal pressure=shorter engine life! I have decided to get a full TII drivetrain, but get a port job, and use NOS insted! I have a friend who has rebuilt his 89 TII 3 times already! That is nuts at about $1,500 a pop! N/As have less hp, but are WAY more reliable, and last longer too! PROUD TO BE TURBO FREE SAYS ME!

CosmicButtHairs

Well heres a big pro for a turbo's, they're goddamn fast.

Tune the A/F, feed the motor with extra fuel, train your eye to watch the boost gauge, and let your turbo cool.
Follow these laws and you'll be ok. Otherwise you'll end up looking like a dumbass like me by popping your motor.

niner

go w/ turbo man.
ive got an 89 NA and its fun and all but its no turbo
so i bought an 87 TII, well its broke now, but i'll be lovin it after i build a new motor

Gefunk

Ok, turbo's can just fly out the window, I have seen what can do to a car when they actually try and fly. Listen buy a cheap N/a that is in ok condition and rip the motor and get a bridgeported one. I hopefully am going to do this along with TII injectors and fuel pump. This won't equal out to the TII but it will come close. Probably lacking around 10-5 HP. Than make sure to put on full easy breath exaust and intakes and woola!

AcmeSkater

The main thing is just about any power adder has the same chance of damageing ur engine you just have to know ur limits and take care of ur stuff and u should be able to get by w/out too many rebuilds . I personally can't wait till i get the money for my JSpec 13bt.

Snrub

iTrader: (1)

Is this going to make it reliable?

NZConvertible

Rico05, what makes you think nitrous doesn't make your engine wear out? Horsepower wears out engines, not turbos.
A 250hp turbo will be heaps more drivable and use heaps less gas than a 250hp bridgeport. Neither nitrous nor a bridgeport will give you the anytime-you-want-it torque of a turbo (you can run out of nitrous but you can't run out of turbo!). A bridgeport will be hard to pass emissions checks if you have to, and nitrous may be illegal to use on the street where you live. Don't get me wrong, I love them both. You just need to be aware of their limitations.

Six Rotors

iTrader: (17)

Look a TII is not inherently unreliable as it came from the factory.On the otherhand when you have people(some,anyway)who own them begin screwing around with without the necessary skills and knowledge it is inevitable that they will become unreliable and in some cases totally screwed up.
Similar antics with N/A cars produce the same result.
Even more distressing are the number of people who appear to be incapable of aquiring and reading the manuals.
I began with an 86GXL,and soon realised that changing the exhaust and intake would not cut it.It made far more sense to me to get a TII,a much more economical performance solution.I like it so much I went out and bought another one!(plus a parts car).Both my cars have been coast to coast
at least twice,never been stuck on the highway and the fuel economy is OK.I have destroyed one N/A motor and one TII motor both due to lack of detailed understanding which is now hopefully corrected.Also neither of my TIIs have noticeable turbo lag(contrary to popular opinion).Only if there is something wrong or if you have a big turbo will you experience significant lag.
You have to wonder about somebody working on a car without knowing which is the brake master and the clutch master!

ZoomZoom

iTrader: (2)

seeing no one has really addressed the question I will. Cons of Turbos are 1. Heat. heat is a major contributer of engine and engine component failure. 2. Increased compression, more compression means need for higher octane fuel and high compression will cause more wear and decrease reliablity, its just plain physics that more pressure will cause more failures. 3. Increased complexity, This will include but not be limited to vacuum lines and more engine management complication with fuel needs and tuning dilemas as well as much more complicated trouble shooting when engine fails to run smooth or at all. 4. Increased cost. Turbos are expensive and maintaining them and replacing them unexpectedly is also a back breaker not to mention all related components. All things considered there is no more efficiant way to make power. The pros will outweigh the cons. The use of the vehicle needs to be the deciding factor as well as cost.

VetteKiller

a N/A is more reliable, accelerates more evenly, and is easier to work on. It however has no where's near the HP per $$ factor the TII does. It takes serious money to get anywhere's near 200RWHP. A Turbo can put out 275RWHP reliably if you know what you are doing and treat it properly. It all depends on how fast you wanna go. If a car that does the quarter mile in the 14s at best a N/A will work fine for you. If you want a taste of the 12s, you gotta go turbo . Not to mention MOST turbo's came with better suspension and brakes than N/As

Maxthe7man

Biggest con of having a turbo...hmmm.. trying to get the smile off my face, and walking around with permagrin...Max

DC350

you said that it's eay to get 275RWHP, i could do it with my NA. Sure, turbo's go faster but with a nice intake, exhaust, some exhaust work, a new ignition with low ohms new wires, aluminum flywheel. take out the rad fan and the air pump, lose 15 lbs, get an electrical fan. I think it could keep up nicely to a turbo. but the fact is that i am jealous i think, I just want a turbo but i have to do to much to the NA to make it Turbo compliant. Well, that's the denial stage for you, but those are the mods that i would like to complete! later

Boosting_FC

Sh-t, I hope this is not going to be another turbo vs. n/a threads...

Here is a thread w/ some heated debated on this subject (thread posted by mazdaspeed7):
https://www.rx7club.com/forum/showth...threadid=46818

Jay

tesla042

Sorry, but there is no way an n/a is going to put down much more than 150-160 rwhp, even with every bolt-on possible. It would take some serious porting to get even close to 275rwhp on an n/a..

And there IS a difference between a stripped out, lightened car that can keep up with a stock-weight 275hp car.. not that you could lighten it anywhere near enough:

3000 lbs / 275 hp = 10.91 lb/hp
150 hp * 10.91 lb/hp = 1636 lbs... nearly 1000 lbs lighter than a stock BASE model..

But yeah...there are plenty of other n/a vs turbo threads out there to complain in...let's try to keep this one on the cons of turbos.. (not like I did...oh well)

-Tesla

Node

iTrader: (1)

I hope you're talking 150hp-160RWHP
Because N/As can make around 200hp at the flywheel. Which I'm guessing to be about 170-180rwhp
And RX-7s (FC's) are rated by flywheel hp
S# N/A / Turbo
S4 146 / 182
S5 160 / 200
remember this is at flywheel.
So taking your theory
A S5 Coupe, weighing in at about 2800 (just to round to a nice number) and a S4 T2 (about 2850)
Take care of emissions, free up exhaust, intake, TB mod, do something about 5th and 6th ports. I'm guessing you'd be about even w/ S4 T2 if not more hp

2850*182hp = 15.6lbs/hp
2800*185hp = 15.1lbs/hp
but thats stock to modified w/ diff series yada yada yada. You could also lighten up the N/A by taking out unneccessary rubber, spare tire, tools, sound dampeneing/insulation if you really feel the need, AC, PS, etc etc etc

But yeah 275rwhp is a totally unreal number for an N/A unless you're lightened balanced, heavilly ported (bridge or PP), fuel, intake, true dual exhaust etc etc etc
basically itd be a loud obnoxious non-legal race N/A racecar

Dak

What your overlooking is torque.That '87-'88 TII makes 186ft/lbs.of torque at around 3800rpm.If you have 185hp in a n/a you still won't have as much torque at 3800rpm as the TII and probably won't have as much torque as the TII anywhere in the powerband.They should be close but the TII still has the advantage.

NZConvertible

Here's the deal: for a mildly modded car, the same amount of money spent on a turbo is going to get you alot more than if spent on a N/A. Beyond that, of course a turbo will be more expensive, but you can go much further. Remember, if you wanna play, you gotta pay!

DC350

Jesus, what chu been smoking? My car already pulls 146RWHP sheesh