Rev Limit- How high can you go?
 

I have been pondering rev limits for my squirted N/A 1.6. AFAIK, the stock limit is 7,300 rpm.

Im thinking around 7,800 rpm. My car is tracked and autocrossed EXTENSIVELY in CSP with 13" Wheels. This translates into a bunch of time spent on or near the limiter for autox.

7800 will be fine I've heard as high as 8500 stock. But I wouldn't go past 8000.

conversly what's the limits for the BP? stock is 6900 iirc, I've upped to 7200, but am wary to go higher..

Up to 7400 since you autocross and track the car. For street use, where you don't hit the limiter so often, 7600. There is valve float above 7800, so there is absolutely no point going over 7800 on the stock valvetrain. Additionally, the stock pulley damper cannot damp the crankshaft's vibrations at that rpm zone (7600+), so you might have shifting problems (especially 2nd to 3rd) and if you insist on revving that high, you can shutter the oil pump's gears. Above 8000rpm you will destroy your rods. The B6 and the BP are boost friendly, not rev friendly (unfortunately).

How about with boost and carillo rods? i was planning on limiting at 7500 anyway since the turbos gonna start getting less efficent around 6500

7500 sounds fine.

I once overrevved my stock motor (sweaty hands + stock shift knob = :mad: ) to about 9k and nothing blew up... These things are pretty stout :bigtu:

Must have been reminiscing your last time driving a RX7 :)

with a good set of rods, billet oil pump gears, and FM valve springs I'd say 9-10K isn't out of the question... but a lightweight pulley is.

the question is when does the cam stop making power, reving the 8k does not do any good if you stop making power at 7k.

i was under the impression there is valve float above 7800.....

Dont forget solid lifters. Otherwise, you might very well be right, well, 10k might be pushing it a bit far even for that stuff and only ok for short bursts.

You are definitely correct, and something someone should consider before building to a higher redline. On the other hand this thread is about how high you can physically take the rev limit until stuff starts breaking and what those parts are and how they can be modified/replaced to allow a higher rev limit. You could also easily say the same things about porting and turbo selection (assuming you are running one).

The reason for asking is that in autoxing, a few more revs can save a gear change for me. Im not trying to squeeze out a few more HP just make less 2-3 shifts.

Im thinking 7500 for AX and 7300 for track

I've set my redline at 7500 and it pulls hard to the limiter. Prior to MS the power dropped off noticably after 6500.

great fun! :D

It is indeed great fun. I am amazed at how much more peppy my lil' ole 1.6 is now run MS.

I get to try it out for real next weekend at a HPDE in Rockingham.

You pull the MAF yet?

me? ;) yup! :D that made a big difference!

Ohhh yeah! I replaced it with a piece of 3" exhaust pipe until I can make time to put my Fuji Racing IRTB's on.

right on, i think irtb is the shizzle

My '04 MX5 SE (aka Mazdaspeed Miata) now spends a lot of time on the track, I've been killing brakes and tyres, so I'm going to go with the 201rwhp map instead of the 233rwhp one and aim to become a better cornerer. The ECU presently stops the action at 6500rpm, which seemed a good thing with the high power map, but was a bit intrusive in several places on the tracks I drive at. So when I finally work out how to play around with the Haltech, can I go with a higher rev limit with less boost?