Is it Possible to for a 13b without turbo, supercharger or bridgeport to do 160mph??
 

My dream is to reach the end of my speedometer, and that's 160mph, just thought I would throw this question out there.

Yes.

RTR, haha, you gotta give me some hints bro! are we talking a fat porting job, and straight pipe exhaust along with performance intake, maybe a light weight flywheel?? or is there something else??

Naws

:((

don't worry about me killin myself, but i understand your responsible approach. 40 more miles per hour wont be anything too hard, i've youtube vids of 120, driving straight is driving straight my friend haha

anyone knows how much more power a bridge port adds to an 88 NA? assuming racing beat full exhaust and cold air intake?

http://www.youtube.com/watch?v=ORh0xJV0y00

He was driving strait, didn't workout so well for him now did it.

i'll take my chances, but i think there is a diff between 160 and 210 haha

yah its possible but the first thing you need is a long ass straight away like the salt flats and not on a public road cuz that shits just stupid

Yeah man, a bridge will do with a nice shot of nos probably. Maybe even a good PP might do the trick.

And yeah, there are some MAJOR differences aerodynamically betweent 160 mph and 210 mph. The increase is exponential.

lots and lots of downforce.

Turn the 6pi into a large 4 port. Or go P-Port. I would want an aftermarket engine management system and a dyno though. You would most definitely need over 200hp and of course you would want the car lowered... I have only done around 125mph... And that was on a tired stock engine and stock suspension. 160mph is a tall order for an N/A car but it could be done. It just takes time, $$$, horsepower, a relatively safe place to do it, and some common aerodynamics (something that is almost already taken care of for you with the FC). If you plan on doing it on the streets, please make sure you are ready for the possible outcomes... Better yet, just don't even do it on the streets.

(P.S. front and rear splitters/diffusers/whatever you want to call 'em might help...)

I went 149mph in my n/a took to long.

Just throw a turbo on there, it'll help. (Get there quicker)

160 mph aint no walk in the park. My old 88 turbo II with 3" turbo back exhaust (and pretty much otherwise stock) did 148mph before it was maxed out. Anyways, don't do it, there is not much excitement to be gained when considering the risks your taking, may as well go autocrossing and have a lot more fun and what do you know, you'll be a lot safer doing so (hopefully:)
.

my 87 tii pegged the speedometer (160mph) and then some with nothing more than an intake and gutted cat. massive boost creep and very cold ambient temps. Even though I did it in a dry lake bed, in hindsight, I was young and stupid (8 years ago?).

1) Probably not as much of a thrill as you think it will be. It'll take a long time to get to speed and there's nothing to feel when accelerating so slowly.
2) Need a massive space to do it safely
3) Even if using a massive area, you probably wont have the proper safety personnel present (EMTs, fire, etc)
4) Its an rx7, take it for some twisty's. You'll be much more satisfied.


40mph diff? 50mph diff?

Actually, I'd say that went relatively well.

To the OP what speed are your tires rated to? That should be your first question, at least to yourself. Don't kill yourself! :)

ls1? jk jk jk

honestly, safety first. but i dont think you can do it on a 13b, even with 13b-re block with rx-8 rotors. maybe if you had naws, but you would need either a huge 125 shot, or like 4 20 pound bottles to hold a 50shot for a long time, don't forget the bottle warmers.

this is off topic but can you fit a 93+ rx7 engine into a 2nd gen?? rx7store.net has a 93+ with a fat turbo on it, race ported, for like 3 grand, maybe 4 after every little thing but that would the job!!

The FAQ thread has all the answers you need :)

The stock speedometer is horribly inaccurate over speeds of 75. Just sayin.





And to the OP:
Just put the 7 on a cargo plane.
Done.

There's no f*cking way a stock block NA FC will hit 160 MPH actual speed. You might get it indicated if you put 13" tires on it or change differential/speedo gear until it's 30% off.

There's simply too much air resistance and not enough power. If you had maybe 300 HP it would be possible.

@MaczPayne, i went to FAQ and searched "swap" and got nothing, i know people will get mad if i post a thread titled "is it possible to put a 93+ 2 rotor in a 2nd gen" so yea haha

https://www.rx7club.com/showthread.p...55#post5131155

5th post about half way down.


And for the original question, as others have said, I think it will take a lot of time and money and will definitely not be as cool as you think it will be. There are much better ways to invest your time and money into your car.

i appreciate that Primos003, i don't know how it didn't show up for me??
and nate91242, that's an interesting comment. I once did 96 mph in a chevy beretta, it felt about as fast as I was going in my rx7 (120mph). I don't believe my speedometer is that far off, rather the suspension on the beretta is very soft and on the rx7 quite stiff but could you or anybody else suggest an aftermarket speedometer which is wickedly accurate??

i just did 120 in 4th with 1.5k room left on a bridge tonight.

Get the one that Brian had on the fast and the furious.

If he can get his eclipse to 160mph, you can do it too.

i hit 138 with a 6 port n/a with secondary ports stuck closed so (all she had in her).. definitely

You were probably doing closer to 120 actual speed.

Just use a GPS.



Beretta at 90+? Yeah, I'd be afraid to go that fast in that car... lol

My brother and I did 160 once in his 3rd gen drag car (yes, he drove it on the street). If I remember correctly (this was 10 yrs ago) he was running a single turbo swap dialed in at 20psi, haltech, 3 inch exhaust, coilovers, ceramic apex seals and probably alot of other shit I don't remember. I was only 14 at the time. The car was built by Don Marvel. Full roll cage and all the safety equipment, even a clutch shield because redline raceway wouldn't let him drag without it.

Anyway, we where going up I-35 to see my grandma in Oklahoma and he got a wild hair...

Since then, I still don't want to go that fast. We'd go over the little hills in the road and it felt like you where going to take off like an airplane, and this was a drag car. I can't imagine stock aero and going that fast.

Its actually about 265 flywheel hp to go that fast.
Here's an example of an N/A streetport build that makes that kind of power.
https://www.rx7club.com/naturally-aspirated-performance-forum-220/make-230rwhp-streetport-13bre-n-818133/
A bridgeport/PP would make that kind of power even easier. You'll be hard pressed to do it with a 6 port engine, though.

You should, at the very least, lower the front of the car so its roughly an inch lower at the front with respect to the rear. This will help to reduce aerodynamic lift.

265 hp is about right, my speed 3 makes roughly that, and Ive been up to its top speed, 155 (with GPS) Took some road but it can do it.

buy an FD i hit 160 before i get to the bottom of the freeway onramp

A stock block can do 160mph+. But not without a turbo./thread

More power, more torque, way more power to the ground (FF), and modern aerodynamics. But you still didn't reach 160!

A streetport is not a stock block! A bridgeport/PP is most definitely not a stock block.


BTW, every time you increase downforce to keep the car from taking off at 160, you decrease the chances of actually reaching 160.

Seriously why would you use ur NA 13b to drag anyways..... for all the money u need to throw into it to hit the speed u wanted (tires, port, aero, fuel support, etc..) you might as well do a turbo swap or 6 port turbo. And if you have that kind of time and money to spend on the NA block... i would take that FC to do some road coruse instead... just my opinnion.

As far as I know my 12a in my sa is stock and I hit 90 in third pretty quick.

ya probably, i did have aftermarket rims on...

@KidA, thats cool man, ill compare that to a stock block S5 motor. apexi power intake is the only mod
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my bad kidA, i totally read your comment once until a sec ago, i thought you were talkin about a bridgeport haha but thats my vid anyways

thats why i didnt say i actually went 160. just said the speedometer hit it.

I'm aware a streetport is not a stock block. No one, including the original thread starter, mentioned a stock block, so I don't know what you're talking about.

As well, I never mentioned increasing downforce, I mentioned reducing lift. It is definitely possible to reduce lift without increasing aerodynamic drag. Venting the engine bay out the wheel wells, putting a full belly pan onto bottom of the car, and lowering the front end of the car will all decrease lift with zero increase to drag.

Downforce is the aerodynamic force downward on a car, lift is the aerodynamic upward force. The two oppose each other, so you can keep downforce the same, and reduce lift, and net the same total results without the typical associated drag result of increasing downforce.

I have been to 160 & above in a few cars, only one FC though. Nothing special really & no point in making a goal like that in stock FC. 160 in a FC is very possible if worked. Using a GPS is a pretty good idea.

The topic said "without a bridgeport," I simply took it even further to that it's even more impossible without a street port.


Generally you reduce lift by preventing or slowing airflow under the car, which increases the airflow around the rest of the car, which increases drag. There is no such thing is a free lunch in physics.


Downforce is the aerodynamic force downward on a car, lift is the aerodynamic upward force. The two oppose each other, so you can keep downforce the same, and reduce lift, and net the same total results without the typical associated drag result of increasing downforce.[/QUOTE]

If you're trying to get to 160 with limited horsepower, you need to reduce drag, even at the cost of higher lift. You'd be better off taking the spoiler off, putting dimples all over the car, removing the windshield wipers, and taping up all the body seams than you would raking the suspension.

I'm going to go ahead and say NO to the OP's original question. Here's why: aerodynamic drag, the major factor governing top speed once you're over 90-100 mph (as opposed to weight) increases with the cube of speed - meaning a doubling of speed requires a quadrupling of horsepower. The stock S4 na was tested reaching 128mph with 146 hp by contemporary magazines (the S5 na, with it's additional 1000rpm of rev range and 14 more hp, gained a whole 2mph to come to an even 130mph). 128 to 160 mph is 25% more speed, or 1.25 times the original top speed. The cube of 1.25 is 1.95 and change, meaning 1.95 times more power is required to go from 128mph stock to 160mph, which means 285hp (flywheel, mind you, so 242 rwhp, assuming an optimistic parasitic drivetrain loss of only 15% - 20-25% is probably more realistic). Which means even the impressive heavily ported and modded na 230 rwhp number in the thread linked earlier won't get the job done, although it could come close.

NOx- how long are you going to shoot NOS to gain that speed? 30 seconds? A minute? Don't think so.

It's NOS.

Pronounced Nawwss.

Learn some respect.

As long as its not a double shot, he'll be fine.

get a sportbike