2nd gen NA Top Speed Poll
 

well hello all, we are discussing the top speed of 2nd gen NA rx7's over in the NW forum area, and I want the imput of the rest of the forum. So how fast have you gone in your NA FC?

in stock it's only go to 136 or 137mph in 4th gear
and slow when shift to 5th

137

Iv done 135.. On a downward slope. On flat I can only pull like 120, than my oil soaked excedy clutch starts giving out.. Mods below

125 on highway

I have had 5 FC's (NA) (1986-1988) of all types since they were new. They go 128-130 MPH TOPS! Any faster than that then they are modded or the speedo is wrong. I can't tell you what a 1989-1991 NA will do because I have no experience driving one that fast.

My boy Hutch's modded NA, we've gotten that lil hoe to a lil past 140. 143 I believe is the exact. But that was it. It wouldnt push anymore than that. topped out.

stock FC no go past 120..street port 720 secondries
intake/exh my 1988 vert on the free way 60-120 mph
so quik it surpises me, top speed of 130-135mph
i heard the stock tans cant really go past 140-145?

We did it. Explain that one. And speedo was not broke. It surprised me too but the car WAS pegged.
His wasnt ported either. It had:
No emissions
weight reductions
intake
exhaust
16" rims which might have helped.
removed 5th/6th ports

hit 148 in a 86 gxl on 15 south to la
with full rb exhaust and header
mild street port
pineapple 6 port sleeve inserts
550 secondary
460 primary
underdrive pulleys
no smog
89-91 intake swap
cold air box in lower grille
tb mod
rb street strip clutch
magnecore 11mm plug wires
no p\s no\ac

forgot to mention it has the automatic rear end and that it still wanted to go faster

I have gone 150 mph in my 87 fc N/a I had Full exhaust from racing beat, HKS Intake, and A center force dual friction clucth. It takes a little while of being on it though. I could easly get to 135-140 mph.

i was runnin at 130+mph when i had my car in gemrmany...its an 88 vert

When I first got my car I topped out at 128mph with stock everything, now I get her up to 145mph(8k in 4th) at least 2 times a week. When I topped her out I go to 8,600rpm in 4th (150mph) then shift into 5th and if I hold it to the floor I can keep it going 150mph for as long as I want.

the fastest i could get my car was 125, now i can't get it to go past 120. Something's up but i'm not sure what it is...i think it's the lack of cold air and the hotter weather.

132MPH
Intake and Exhaust

257 km/h on the bottle

This topic of this thread shouldn't be "top speed"; it should "highest speedo reading". If you guys think the speedo isn't reading high at those speeds, you're kidding yourself.

Some claims here simply defy the laws of physics. Power required increases to the third power of speed, so to increase your top speed from 130mph to 140mph (~8%) you need 25% more power, and you need to be making it 8% higher in the rev range. Assuming a stock 160hp S5 can reach 130mph, it'll need 200hp to get to 140mph. To get to 150mph you'd need 245hp. See how some claims start to sound a bit unlikely?

Thats assuming everything is flat, there is no wind, the air temp is at what? WAY to many things go into how fast your car can go. Not just hp. (not bashing just making another pointer)


Math isnt always right. (yeah I know it sounds dumb)

215 auxilery ports not workin and slipping clutch.. mazdatrix straight dual exhaust..

This place should be called the RX-7 MIS-information forum.

Let me go along with the flow of insanity here.....

OK.... My modded FC NA with the usual mods... Let me pick a number....????..... It goes.... 170+ in 3rd gear uphill into the wind.... I do it several times weekly...

stock FC modded... TOPS=135 MPH AT BEST!!!!!

That's completely correct, but if you're quoting top speed on an incline you're an idiot, and it's going to take a hurricane-strength tailwind to get an NA FC with an exhaust up to 150mph. Air temp doesn't have a huge effect, as both power and air resistance increase as air temp decreases and air density increases.
Yeah it is actually. But we can use it wrong... ;)

Well with those secondaries you're probably losing 30 HP when they kick in, so....

Same here...Put the stockers back in and lean it out some...

basicly what I ment to say.


3rd gear that fast?! lol j/k

I had mine on 150mph on the stock speedo, still had some rpms to go too.

145 mph doing a wheelie on a 8% grade with just exhaust and a filter, bottle was empty.

Suuuuure.

I get mine up to 120 and get bored with it because it stops accelerating hard, so I can't say how fast my streeetport stock exhaust FC can do.

I have a S5 with an auto and The fastest I think I went (speedos aren't 100%) was 137mph. I backed down because I didn't realize how fast I was going. I was racing a pretty relentless Acura Legend and I noticed the speedo was closing in on 140mph and my tires are only H rated so I backed down so I wouldn't die. Its very possible in a S5 auto with 3.90 rears to do 140+.

With a stock or mildly modded engine, I highly doubt it...

Ive done 240km/h in my ported N/A atleast thats what it read on the speedo.
(Hereby not saying that I was actually going that fast) :D

ive gotten mine up to 125 wineding out 4th on the highway...5th gear in these cars is just too tall. id take a curvey road over topping these things out on the hw any day.

It must have taken you guys a longggg time to get to 140. I have a 88 vert 62,000 miles, hks intake, full exhaust, slipping clutch. It took me a couple miles to get to 120 and it didn't get there very quick.

Just shy of 140.

-Markus

Getting to 110 was easy. It took me about 2 miles to get to 137mph. I'm going to test it at the salt flats this year to get a real estimate on top speed.

135 mph is the fastest ive gone, im sure it will go faster!!

5th gear sucks on my s4 n/a

about 8250rpm in 4th gear. i have slightly larger diameter tires than stock so that equals a little over 140mph. and this was with the headlights up. it just doest pull once you shift into fifth tho. maybe the intake porting im doing right now will fix that. hehe

no way a stock auto s5 could get over 140. the trany sucks to much power especialy at the higher rpms. the 3.90 rear end is a pluss but slush box counters it being sefull at all. now a 3.90 in a modded s5 with a manualy trany could maybe make it to 150mph or so. i think you'd need a turbo to have any chance of pulling in 5th gear since its so damn tall on these cars.

Ths BS is so deep here!

My GTUs will hit 150+.........

































oh yeah....it's turbo....not N/A.....sorry to hijack ur thread.

125ish is very possible topping out fourth...anything above that is impossible 5th just doesnt pull

150 mph 1988 se no cats car was fully gutted had an lsd rear

umm, gutting wont give the car a higher top speed.... you need about 200hp to get it that fast. i call bs unless you lots-o-mods.

wrong...I've had my stock 1987 FC to a little over 130, so how could the top end be 120?

my s4 with ram air.exhaust and a few minor tweaks ran around 125 when the buzzer got too annoying.
i was side by side with my neighbor in his boxster s and im sure his speedos more accurate than mine. theres jsut no more power at that point, i dont see how you guys can get to 150.

Wow, Alot of these times are BS, and I cant believe that alot of people called BS on my top speed before. The fastest I've had my TII wth the shit I have on the car is about 7K RPMs which is nearly 170MPH..

If you read what I wrote we are in total agreement! 128-132 is the best I have ever seen on a NA 1986-1988. Topped out in 4th. I know my speedo was 3 MPH high as well.

Some people don't read posts all the way through. I said the speedo isn't 100% accurate sometimes even way off. Also it was a S5 auto which is alot better than a S4 auto. Plus 137mph is pretty reasonable so whoever keeps crying BS needs to realize most 7's are pretty hammered and can barely reach 120mph so its possible some in good condition can reach 140mph.

I've read this post ALL the way through....


Me and my buddy were in a 1988 n/a gxl with a intake, and a fairly new motor (only 40k on the motor) we got up to 120's range (I was driving) I just took a quick glance thats what the speedo said. I wasnt paying much attention to the guage being that we were killing this foxbody mustang. It only took about a mile to get up to 120 if not less distance then that. Then we were about to roll on the expressway passing the police station so I slowed down... Btw we had atleast 4 car lenghs on him when I hit 120'ish.


Some of you people saying it takes a couple miles to get up to 120/130 area are just INSANE, or your rx-7's are MISSING a TON of their power.

86gxl....140mph "on speedo" slight downhill slope
89 mildport engine
550 secondaries
RB header to collector-presilncer--catback
msd
electric fan
no a/c
no airpump
cone intake
17" rims w/ 215/40 tires
eibach srings
agx shocks/struts
windows closed sunroof open a little
my stock clutch cant take it anymore and i usually have someone in the passenger.
Dyno's @ 163rwhp@125 lbstq