JIMMY54

iTrader: (2)

On a GSL-SE What's the highest rpm to shift at without blowing the motor? My engine is somewhat modified, except internal mods... I was told about 8400rpm.... My car once was shifted at 8000 rpm, ONCE, by a dealership mechanic that I will one day hunt down...

The most I've ever shifted at was 7400 rpm, but it's been done quite frequently on my part.... But usually I shift at 7000 rpm, when I'm speeding around.

Rotor7

i wouldnt go over 8400... u tend to get internal vibrations at around this point that deliver all sort of nasties

that said... my mate has a stock 13b in which he shifts at no l;ess then 10,000 rpm.. and yes.. its still going strong... after 18 months.....

strange world we live in

7500 - 8000 is a good number

mazdized

Stock porting, you can't hurt it.

JIMMY54

iTrader: (2)

"Stock porting, you can't hurt it." please explain further PLEASE..... you have my full attention...

jimmyv13

I only have a GSL, but I have shifted mine over 8K quite a few times. The first time I did it, I was smoking the tires and the buzzer went off so I looked down and I was way over 8K!!!!!! I let off the gas and just listened...... gave it a couple of revs and it was fine. Scared the **** out of me. I have a SP so mine may be different. My power drops a bit over 8K, though.
I have recently made custom gauge faces that I have added numbers to the RPM gauge so I know where I am when I go over 8K.

rx7gslse

I've got a question that related... Stock motor, is there actually a point to going that high? Does the power stay as high all teh way up to 8500, or drop off? Other than in like an AutoX situation where you don't want to upshift only to have to downshift again, is there an advantage? Thks

Jeff20B

iTrader: (13)

Well, its cool to listen to the singing of the ports, so to speak but for power, just use a dyno to tell for sure when to shift (a butt dyno would probably work fine in this sort of test). Just shift when or after the power drops off a bit.

David88vert

I shift my ported 13B at 9k, but a missed shift exploded my tranny .....

speckamp

8400 is the limit in theory of the stock rotating assembly. That said, there's not reason on a stock GSL-SE 13B to shift that high. Stock, the power peak is at 6000RPM, so shifting so you come down just below the power peak is a good thing, so I usually shift at 7000RPM, which most times drops the tach down around 5000, which is well within the powerband and suits me just fine (the few times I've broken the rear end lose going into 3rd).

--matt

Jason Guthrie

OT

For Real?

My 85 GSL-SE is reasonably stock engine wise with the exception of newbie equipment like K&N intake, some NGK Wires, catback exhaust. With that said, I have NEVER broken loose my tires on any decent street in the dry weather going into 3rd and going into 2nd is rare and very mild. Not with my Stock wheels or my 15"x7" setup. My car is not lagging in compression and I shift 5000rpm+ regularily often shifting at 6000 or 7000. I do live in California so I can assume I have some CRAP on my car inhibiting this phenomenom but DANGIT, I want to tear me some tire. What's up!

I can often spin the tires in rain, shifting hard around corners like on-ramps, or dropping the clutch poorly...

speckamp

I'm running pos stock sized tires on stock rims. 3rd is rare, but 1-2 I can chirp hard if I feel inclined. Once, and ONLY ONCE, I have felt the rear wiggle a little going from 3->4. I was going flat out and banged 4th hard as a biatch with the buzzer singing. I was racing (and beating I might add) a second gen that some damn bastard had riced out, and let rust out Dude didn't know how to drive his car at all. I dove past him doing 100+ and bit deep into a sweeping corner still doing well above 80. He used liberal amounts of braking Wuss. Oh, anyway, heh, getting off track here, I think that once I put the Dunlop SP Sport W-10's on there w/ 15" rims the rears won't spin nearly as easily. Of course, I'm also going to have to put a new clutch in, since mine is slipping now, and I'm sure stickier tires are just going to accelerate the wear on the clutch.

--matt

JIMMY54

iTrader: (2)

With dunlops w-10's like on mine you'll never hear any sounds, you just feel the rear end slide side to side. And on my se there is loads of power between the 6-7k this is what has been done to my stock motor.

-cone intake
-header
-2.5 inch full exhaust
-MSD ingition coils
-wires
-2nd gen plugs
-timing bumped
-fuel pump w/regulator

Jeff20B

iTrader: (13)

'round these parts, 3rd gear chirps are real commonplace Itellyouwhat.

Barwick

I race RX-7's (or I'm working on one to race anyhow) and I've talked to a few people about them, one guy says "on a stock 12A you can shift around 8000 on the track and be ok, if it's built like mine is from SDJ Motorsports, 9k is good". His reasoning was with a good carb and exhaust on the car, it'll keep flowing the air good enough to keep on building reasonable power. So I'd say you're safe shifting at 8000 RPM, but no real reason unless you know (dyno) that it's doing something for you.

One Fast Seven

I usually shift around 5500 or so during normal spirited driving (after the car warms up of course ). If I'm on it hard or racing someone, I'll wind it up to 6500 - 7000 every time. Easily chirps tires from 1st to 2nd. Harder from 2nd to 3rd, but occasionally gets a squeak!

Max7

A 4 puck clutch got me nice chirps into 4th
I don't shift much past 7500 ish on the streets
mostly 5k shifts
unless at the autox, then its bury the tach time.

JIMMY54

iTrader: (2)

max7- who makes your clutch? with the mods I've listed so far do you think I need a better clutch?


-cone intake
-header
-2.5 inch full exhaust
-MSD ingition coils
-wires
-2nd gen plugs
-timing bumped
-fuel pump w/regulator

Max7

Got it from Mazdatrix, (Racing Beat clutch)
4 Puck sprung center, and HD pressure plate
its right on the edge of streetability, but great when you get
to the track. although I did snap 3rd gear on my old tranny a month later.
I might stick with the HD Clutch and PP next time, not sure.

mazdized

I had SE internals goto 9,200+ briefly. With stock porting it will just not accelerate that much after 8,500.
Unless it is in neutral.

Jeff20B

iTrader: (13)

Oh my, old thread!

TexasGunRunner

Wow, this is an old thread...but it clearly shows I don't know what the Hell I am doing the way I drive.

Previously, the only vehicles I had with standard were trucks (then I rented a Viper...but that is another story). Anyway, that is probably a lame excuse...I usually shift between around 3K RPM.

The other day I excelerating hard (trying to impress) and I heard this shrieking buzzer ...scared the bejeezes out of me - I thought some Honda piece of rice was honking at me (deja vu of a near miss in high school back in 1984)...I was shifting near redline.

So, if the peak power is around 6K, then I should be shifting shortly thereafter...well after where I am currenlty shifting. It just jumps from the 3-7 so quickly though...

This really makes me want to learn how and when to shift better.