What are the exact shifting points for an sr???

[GoldWatchKid]

What are the exact shifting points on a pretty much stock sr.

I'm boosting around 12psi on a stock t25.

I've been shifting evry 7,000-7,500 rpm. I know its stupid, but that's most people do. Go through each gear like you stole it.

Let me know the exact range/rpm for each gear.

I've always heard differant things. I would like to get it straight.

Thanks

[GoldWatchKid]

This is an sr thread...

I'm sure someone has been going to the track with there stock/modded sr.

Help me out guys. I'm going to the track tom. Night.

Any help is much appreciated.

[quiksilvia]

i always shifted at about 6500, u can feel the car not accelerating anymore after that and i dont like killing my 2000 dollar motor

[getnrowdy23]

me too about 6500 is where the stock t25 doesnt do very much.

[atcq110]

true the motor does loose a little power around 6500 but the motors redline is 7550

[GoldWatchKid]

Yeah, I def thinking about shooting for 6500rpm for each gear. For some reason if I wait till 7500rpm in 1st its really hard to shift to 2nd.

I've changed my slave/master and it still does it.

It should be easier shifting at 6500rpm.

My momo shift knob keeps sliding around. Any tips on making it not slip.

Also is a short shifter a good idea?

Thanks guys

[TougeTune180]

i have short throw, its realy nice, makes shifting very quick and precise, but it feels a little mechanical, is that normal?

[bigodom1]

turn that hex key till you feel like its bending and breaking on the shift knob. the B&M shifter is the bomb and i shift around 6500 myself

[GoldWatchKid]

My shift knob is a screw on momo, but yeah I was thinking of the b&m.

[Fenvy]

I shift at 7k but that's because I have a t28, I don't feel the loss of power but shoudl be close

another reason is that I am so used to 7k, I shift in my integra at 7k, s13 ka24de 7k, naturally the sr will do 7k also.

[SoCalS14]

I hope your running some bigger injectors at 12psi. I recently logged some runs on my emanage, and let me tell you, with my t28 pushing 12psi, at 6000rpm, the injectors are at 98%. Be careful.

[GoldWatchKid]

Damb, so you think I should get bigger injectors. My ecu is upgraded. Its programed for 550cc z32 fuel cut, rev cut, and a better fuel curv.

So its running rich.

[spanishricer]

Damb, so you think I should get bigger injectors. My ecu is upgraded. Its programed for 550cc z32 fuel cut, rev cut, and a better fuel curv.

So its running rich.

I think something's wrong if your running the stock 370cc injectors and an ECU programmed for 550cc injectors...

[s13sr20chris]

show me a dyno graph and i will give you a shift point in every gear. i did the work once with someone elses dyno graph that i found and i found the shift point to be around 7000rpm in every gear. the graph was for a redtop running a t25 at 12 or 13psi. i will try to find my thread.

[s13sr20chris]

zerothread?id=92700

here you go!

[GoldWatchKid]

I can't afford injectors or a z32 right now... So running rich will have to do.

[got2b240]

dude, you will be running lean.

Its squeezing out less pulses to compensate for the size of the injector its programmed for.

i would watch it boy

[spanishricer]

dude, you will be running lean.

Its squeezing out less pulses to compensate for the size of the injector its programmed for.

i would watch it boy

My thoughts exactly.

Who told you that you were running rich?

[GoldWatchKid]

Well. For one all sr's normally run a little richer to compinsate for the turbo.

my afr tells me im running a little rich.

[spanishricer]

Well. For one all sr's normally run a little richer to compinsate for the turbo.

my afr tells me im running a little rich.

Well I hope you have a wideband AEM Uego afr and you're not depending on some Autometer afr. Those things are pretty much junk when it comes to accurate readings...

[TunaFish]

90% of the time, the fastest way to drive any car is going to be shifting at the redline/rev limit regardless of the car making less power as it reaches that point.

What gearing does, is alter how much torque your putting to the ground. The quick description being torque multiplication. The lower the gear, the more torque being put to the ground (which is why dynos have to be corrected for gearing to get an accurate reading)

Because of this, even if you are making less engine power at 7,000rpm in 2nd than you would at 6,000rpm in 3rd your still putting more torque to the ground in 2nd.

The only exceptions is the rare case where the engine makes so much less power up high that even the torque multiplication doesn't make up for it, or when your gearing is short enough where shifting higher puts you past or in the middle of your powerband instead of right at the beginning.

I will make a graph of the torque multiplication/gearing of a stock SR later if I can find a dyno and have the time.

[GoldWatchKid]

Well I hope you have a wideband AEM Uego afr and you're not depending on some Autometer afr. Those things are pretty much junk when it comes to accurate readings...

LOL...

[GoldWatchKid]

90% of the time, the fastest way to drive any car is going to be shifting at the redline/rev limit regardless of the car making less power as it reaches that point.

What gearing does, is alter how much torque your putting to the ground. The quick description being torque multiplication. The lower the gear, the more torque being put to the ground (which is why dynos have to be corrected for gearing to get an accurate reading)

Because of this, even if you are making less engine power at 7,000rpm in 2nd than you would at 6,000rpm in 3rd your still putting more torque to the ground in 2nd.

The only exceptions is the rare case where the engine makes so much less power up high that even the torque multiplication doesn't make up for it, or when your gearing is short enough where shifting higher puts you past or in the middle of your powerband instead of right at the beginning.

I will make a graph of the torque multiplication/gearing of a stock SR later if I can find a dyno and have the time.

Thanks for the help bro. I would love to see it.

[240SXer]

6500 seems wayyy too low for an SR. 7k would be the lowest i'd shift.

[s13sr20chris]

just thought i would repost this. i have done the math for this guys dyno chart and figured the optimal shift points for his chart.

ok, i used the dyno graph from this threadhttp://www.nicoclub.com/zerothread?id=90260and the gear ratios to come up with shift points for a sr with the stock turbo maxxed out(what most folks, myself included, tend to run).first to second=7500 or as high as you can gosecond to third=6900third to fourth=6700that is for maximum acceleration in a straight line on the above setup.

[TunaFish]

ah you still want to be shifting at redline if you want to be accelerating the fastest possible.

Gearing works as such

gear ratio * final drive ratio * engine torque = torque to the wheels

Here is a graph of the torque to the wheels in every gear, as you can see the lines never cross over so the longer you stay in a lower gear the more torque that is being put to the ground and the faster you will be moving.

[GoldWatchKid]

Thanks guys, im going this friday to the track. All your advice will help.

[got2b240]

cool deal let us know your results

[GoldWatchKid]

will do

[ill_sil]

My mechanic builds racecars/bikes that go sub 8's and 7's and he told me i should shift like this-1st 5200-2nd 5200-3rd 6500-4th 6500~7000

I guess the reason he says this is because HP and TRQ almost always cross at 5225ish

he also suggested that i try launching in second.