Mindy's Reincarnation

[BadBoostedBmwM3]

I like the formulas. Care to post the base formulas? Nice!

[mcoupemindy]

I had been busy getting the car ready for the private rental this last weekend at MIR. Unfortunately the weather didn't cooperate, so I wasn't able to see what it could do now.

I did make some changes.

#1 - Replaced the plugs with the standard 4554 NGK's. These cheap plugs seem to work the best. Since I was getting what I believe was spark blowout, I gapped to .018" this round. Seems to have a bit more of a cranky idle, but no breakup at boost.

The old plugs were installed with .020" gap - came out with the following gaps:

1 - .023" (I think this was the one misfiring)
2 - .020"
3 - .021"
4 - .021"
5 - .021"
6 - .020"


#2 - Racelogic is installed. What a total pain in the ass. Hopefully it will help. I'm putting the settings that seems to be working best below. I haven't been able to dial it in 100% yet, but it's working. I have a lot of mechanical grip on the street already, so you gotta wail on it to get it to kick in. I'm thinking autocrosses in the spring will allow me to dial it in much better. I did take the car for a long drive in the rain yesterday without much interference. It is much faster than controlling the throttle with my foot.

[M5Hunter]

Fancy

[RVAE34]

Oh he fancy uh?

[chikinhed]

I think that it's great that you installed Racelogic. It makes trying to exit a corner less stressful when the turbo decides to spool and gives you more capacity to work on timing when boost happens. You will love it once you start trusting it.

If you think it is shuddering too much then lift off the gas a bit. You can almost use it as 'training wheels' for driving a high hp car if you pay attention to when it is doing its thing.

Sent from my GTX3582R

[Placemotorsport]

Nice meeting you yesterday, your car is a beast!

[highboostingm3]

I was lucky enough to be in the passenger seat running through 3-4 gears in this car at "only" 27psi. She is the reason and also why I now know I made the perfect decision to go with the SPA manifold and e85.

Now...I am even thinking about going to the same SPA turbo that he has. This car has the best powerband I have ever felt period.

[chikinhed]

Isn't the closest turbo to the SPA 7000 a GT4088R?

Cam, get the new GTX4088R!

Sent from my GTX3582R

[highboostingm3]

Isn't the closest turbo to the SPA 7000 a GT4088R?

Cam, get the new GTX4088R!

Sent from my GTX3582R

It would be good to break them both down mathematically. First of all the GT4088R is only available in a t4 divided housing of .85 or .95 (might have a larger one than .95 but no need for that). The SPA 7000 that Jonathan is using has a t3 .63 a/r open turbine housing. Now that is small. Although I do not know if there is data on the absolute volume of each turbine housing as that would help immensely with this conversation. I saw the .63 a/r housing with my own two eyes and it is incredibly small. Proof is obviously in the pudding though and there is a ton of proof in this thread.

We haven't even started with the difference regarding the turbine wheel and compressor wheel.

Hopefully Jonathan will have some time to respond to this as he might have all the data necessary and he is a math whiz.

[mcoupemindy]

It would be good to break them both down mathematically. First of all the GT4088R is only available in a t4 divided housing of .85 or .95 (might have a larger one than .95 but no need for that). The SPA 7000 that Jonathan is using has a t3 .63 a/r open turbine housing. Now that is small. Although I do not know if there is data on the absolute volume of each turbine housing as that would help immensely with this conversation. I saw the .63 a/r housing with my own two eyes and it is incredibly small. Proof is obviously in the pudding though and there is a ton of proof in this thread.

We haven't even started with the difference regarding the turbine wheel and compressor wheel.

Hopefully Jonathan will have some time to respond to this as he might have all the data necessary and he is a math whiz.

I would assume hands down that the GTX wheels are going to be more efficient. That said, here's a dimensional comparison.

	SPA 7000M	Garrett GTX4088R
Compressor Inducer	65.0 mm	63.5 mm
Compressor Exducer	96.3 mm	88.0 mm
Turbine Exducer	73.5 mm	77.0 mm
Turbine Inducer	63.9 mm	68.0 mm

You'll see that the raw size of the compressor on the SPA 7000M is closer to a GT42 than a GT40, yet the hot side is much smaller, almost GT35ish. Everything shows that these engines do well with smaller hot sides for reasonable power levels (not 1000whp - that's a whole different game).

I don't have pure math to support anything here and this is only my opinion. Pure math is going to be hard on this.

[Butters Stoch]

Not many on here use the SPA 7000, this is a TRM stage 2 option correct ? Wonder why its not used as much, looking @ your graphs?

[Kyler Relyk]

Jonathan I sent you an email about that clutch, can you reply?

[cragg56]

Not many on here use the SPA 7000, this is a TRM stage 2 option correct ? Wonder why its not used as much, looking @ your graphs?

It's considered "lazy" at low boost levels, but clearly it has been shown to shine at higher PR.

[mcoupemindy]

Not many on here use the SPA 7000, this is a TRM stage 2 option correct ? Wonder why its not used as much, looking @ your graphs?

It's considered "lazy" at low boost levels, but clearly it has been shown to shine at higher PR.

Exactly. For pressure under 20ish PSI, I would not recommend the SPA 7000M. It is a large frame turbo and requires some "ass" to get it spooled up. It really shines between 26-30psi. Even though the wastegate is still open at 32-33psi, I'm not sure how much more it has in it, if anything.

If you compare to a GT4094 compressor (similar dimensions), you'll see that at 3bar absolute, I'm likely nearing the end of any efficiency. On our efficient engines, we typically get about 10whp per lb/min. If I was to be a betting man, I'd say the 7000M would be completely tapped out at 800whp at roughly 36-37psi.

[MikeE36]

The SPA7000M is a beast no doubt! I loved it on my SPA. Hard hit at 4500 rpm on my M52, and a rocket to redline. 500/460 @ 19 psi on pump.

Jonathan - I want a Go Pro in car at 32 psi with an external mic, 60-130 please. I'll even let you borrow a Go Pro

Mike

[mcoupemindy]

The SPA7000M is a beast no doubt! I loved it on my SPA. Hard hit at 4500 rpm on my M52, and a rocket to redline. 500/460 @ 19 psi on pump.

Jonathan - I want a Go Pro in car at 32 psi with an external mic, 60-130 please. I'll even let you borrow a Go Pro

Mike

Mike,

We had the cameras, GoPro's, Mics, etc. ready for last weekend at MIR. But that didn't pan out unfortunately. 60-130 videos now will have to wait until the spring because I'm not going to be a dumbass and do that stuff on the street!

What I will tell you is with the Racelogic, the car will consistently pull sub 4.0s 0-60 times (log verified).

[cragg56]

What I will tell you is with the Racelogic, the car will consistently pull sub 4.0s 0-60 times (log verified).

Awesome. Also, thanks for posting your RL calibration info. If I ever get my car running I will be needing that info to use as my initial setup.

[mcoupemindy]

Awesome. Also, thanks for posting your RL calibration info. If I ever get my car running I will be needing that info to use as my initial setup.

One recommendation I have is to go to your tire manufacturer's website and look up the diameter there and convert to mm. You can't trust just using the printed tire size to convert as it could be way off.

I also have all my stored slip info turned WAY down as I wanted to be able to refine down to almost no slip with the controller. Note that the percentage on the controller is added to all these values thus these are basically the wet values.

[mcoupemindy]

Bye bye transmission.

http://instagram.com/p/hEb4A6Igxp/

[beeasy]

Bye bye transmission. http://instagram.com/p/hEb4A6Igxp/

Lol. I love the commentary.

What happened?

[gemolken]

www.myinstants.com/instant/snl-oh-no-1-of-4/
www.myinstants.com/instant/snl-oh-no-2-of-4/
www.myinstants.com/instant/snl-oh-no-3-of-4/
www.myinstants.com/instant/snl-oh-no-4-of-4/

Torque is what wins... hehe

[highboostingm3]

Bye bye transmission.

http://instagram.com/p/hEb4A6Igxp/

Finally! You broke it. You must be so stoked since you had been disappointed that it had not broke. :P

[mcoupemindy]

Lol. I love the commentary.

What happened?

Torque happened. LoL. And I love torque. All of it. All the time.

- - - Updated - - -

Finally! You broke it. You must be so stoked since you had been disappointed that it had not broke. :P

I wish there was a light that illuminates when something is about to break.

That way, you could look at your passenger and say "wanna see something cool".

The only disappointment I have is this happened on just the spring - come on, at least give me the chance to use the controller. Was able to still drive it home (was right down the street) in higher gears with the trans trying to spit metal chunks out. Hahahahaha.

[MMR]

Damn, not good to hear.

[good & tight]

I'm surprised it lasted so long at that torque level.