What RPM would you shift based on this dyno graph ?

[Unas2k5]

Here’s one of my dyno graphs. I was wondering at what RPM I should shift ?

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[illtal]

7300-7500 RPM, around there the torque is falling off but the HP isn't. It is a centri graph, and you have something interesting going on at 7000 RPM. Either the ECU is picking up some knock there (boost also jumps non linearly a bit), or something else, you have a similar jump in HP then the HP flattens but the boost keeps increasing.

Any more RPM will likely not give you additional power without better fuel (more octane). Is this a 93 octane graph?

 

[Zrussian13]

Since your an mt82 car I'd be shifting close to 8k to keep the rpms from dropping off in the next gear.

 

[Brisvegas]

Here’s one of my dyno graphs. I was wondering at what RPM I should shift ?

It's not quite that simple without knowing gearbox ratios , you pretty well want to drop into the RPM just below where peak torque is on a gear change . In fact the ultimate way to capitalize is to adjust the gearbox ratios to both maximise peak horsepower pre shift into a gear where you are about to enter the fat part of the torque curve .

 

[ShadesOfBloo]

Here’s one of my dyno graphs. I was wondering at what RPM I should shift ?

Where's the redline on your tach?
(Except for the huge numbers) It looks a lot like the power curve for my Gen III Coyote, where the power curve starts to make a plateau around 6500rpm. In my car, I'd just shift at my 7400rpm redline.

Since your an mt82 car I'd be shifting close to 8k to keep the rpms from dropping off in the next gear.

Since the OP has a 2015 car, and might still have the 2015 gear ratios, my guess is he doesn't have that much of an issue with dropping RPM.

Based on his mod list, I'm going to go check out the gear ratios of a "Ben Calimer Stage 3" transmission.

EDIT: https://www.calimertransmissions.com/mt-82

-Our Calimer Built Stage 3's gear ratio is:
GEAR RATIO
1ST 3.46
2ND 2.29
3RD 1.61
4TH 1.26
5TH 1.00
6TH 0.61

That's geared a little bit taller than stock - not the radical difference of the 2018+ Getrag - and I like the gear spacing that I see here.

 

[Unas2k5]

This is an E85 tune on a 9.5 :1 compression gen 3 aluminator I have Boss valve springs and 3.55 gears. I thought it was unsafe to shift at 8k im gonna test out my times with a dragy. It’s still freezing out we have 2 more months of winter.

 

[illtal]

This is an E85 tune on a 9.5 :1 compression gen 3 aluminator I have Boss valve springs and 3.55 gears. I thought it was unsafe to shift at 8k im gonna test out my times with a dragy. It’s still freezing out we have 2 more months of winter.

You probably can shift a bit more RPM but your torque is already falling off.

Also I missed the fact that this is over 20 lbs boost right around where the pull got shut down. You might be able to run less RPM and more boost but shift at 7300 which is before the tq really starts to fall off.

Boss springs are the same as regular gen 2 springs (I think). If this is the case I would not advise any more RPM (especially with the tq dropping already). Just more boost.

I think the flattening may be the SC not being able to flow anymore cfm, or it's cam timing. The way it flattened out is very curious to me. Should still be increasing even with the dropping tq.

 

[shogun32]

7K or a little before. No point beating on the engine. When the RPMs drop for the next gear and it's at 5 grand or more, you're good. There are a dozen things that make a run go badly, shift-point is a relatively minor one.

 

[Unas2k5]

The P1x is pretty much maxed out. I would need to upgrade the head unit to a D1X to get anymore power. I have another dyno it made 853 and 639

 

[illtal]

The P1x is pretty much maxed out. I would need to upgrade the head unit to a D1X to get anymore power. I have another dyno it made 853 and 639

Ah I was right, well sir you probably can run 30 lbs no problem hope you have head studs!!!!

 

[Unas2k5]

Ah I was right, well sir you probably can run 30 lbs no problem hope you have head studs!!!!

Yeah it does have head studs. The boost is so high because of the lower compression. I think I’m fine at it’s current power level I may not upgrade to the D1X

 

[illtal]

Yeah it does have head studs. The boost is so high because of the lower compression. I think I’m fine at it’s current power level I may not upgrade to the D1X

What size injectors are you running?
Are you the guy that had brenspeed build a motor for you?

 

[Unas2k5]

That’s the head studs on it. Not sure if that makes a difference

 

[Unas2k5]

What size injectors are you running?
Are you the guy that had brenspeed build a motor for you?

I have a fore innovation l2 dual fuel pump

 

[illtal]

I have a fore innovation l2 dual fuel pump

the brand of head studs don't matter that much it's the way that they clamp down that makes the difference, hence making it a superior product vs head bolts.

Ah you are the guy... anyways yea it's a good build.

What fuel injectors are you running ID 1700x or ...?

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