MAPerformance: Ultimate R&D Thread | Air, Fuel, & Turbo Upgrades

[AngelOreo]

Here is all 3 laid over. As you can see our turbo kit produces more power than the stock turbo will full bolt on's from 4,000rpms and on. Just a little bit of information both Automatic and Manual cars never come down below 4900rpms between shifts.

As always, you come through! You know us... give us an inch... we want more!

What RPM are the shifts? 6800? In regards to the RPMs between the shifting, what gears are in your test car? 31's or 55's?

I suppose since you stated it that way, it covers both. *sheepish* :doh:

Sponsored

 

[AngelOreo]

Annnnnnnd again. I fail at counting. Just saw the lines on the bottom to count the RPMs in between...

Disregard Shift RPM Question.

Thank you very much again for all the data you share!

 

[MAPerformance]

Annnnnnnd again. I fail at counting. Just saw the lines on the bottom to count the RPMs in between...

Disregard Shift RPM Question.

Thank you very much again for all the data you share!

No problem. Just to be clear, it will cover both MT and AT with any gearset as 4900rpms is the lowest which is from 1st to 2nd gear in a 3.31 gear car and that was short shifting at 6000rpms.

 

[Herr_Poopschitz]

i dunno stock convertor seems pretty loose i can foot break to 3300-3400

...stock turbo makes a bit of boost by then, yes? So the increased torque should increase the stall a bit...

Can't help but wonder how it would react w/ this/a bigger turbo?

I personally like the idea of an auto w/ 3.15s, but worry a bit about delayed response from a dead stop.

 

[greg hazlett]

...stock turbo makes a bit of boost by then, yes? So the increased torque should increase the stall a bit...

Can't help but wonder how it would react w/ this/a bigger turbo?

I personally like the idea of an auto w/ 3.15s, but worry a bit about delayed response from a dead stop.

Had that setup on the 2013 GT and no issues at all, NA or TT. I am going to keep saying it until everyone understands that the 6R80 1/2 gear with the 315 gears are more than enough for 800+ hp and for a turbo app 315/331 are perfect.

 

[AngelOreo]

...stock turbo makes a bit of boost by then, yes? So the increased torque should increase the stall a bit...

Can't help but wonder how it would react w/ this/a bigger turbo?

I personally like the idea of an auto w/ 3.15s, but worry a bit about delayed response from a dead stop.

I was talking to Adam about something similar about where the usable power is for my driving situation. In my case, I'm in traffic or single lane busy roads 90% of the time. I am not going to be going to the track at this point, so having a ton of power up top would not be as useful as down bottom.

My thought for myself if I wanted to get the turbo, would be upgrade to 3.73's to get in three higher RPMs quicker, there, you have a higher multiplier on your torque down low til you build enough boost/power. The down as side would be a very squirrelly second, and or shallow gears/an extra shift possibly.

To be honest and upfront, I know very little about automagics, so please forgive me if my ignorance shines too brightly.

 

[Herr_Poopschitz]

Had that setup on the 2013 GT and no issues at all, NA or TT. I am going to keep saying it until everyone understands that the 6R80 1/2 gear with the 215 gears are more than enough for 800+ hp and for a turbo app 315/331 are perfect.

Ha, yeah Greg, but off boost you still had a relatively torquey 5L pulling you around...been there done that. Guessing a little 140 ci 4 cyl in a heavy car might feel a bit different when waiting for the boost to show up...

 

[greg hazlett]

I was talking to Adam about something similar about where the usable power is for my driving situation. In my case, I'm in traffic or single lane busy roads 90% of the time. I am not going to be going to the track at this point, so having a ton of power up top would not be as useful as down bottom.

My thought for myself if I wanted to get the turbo, would be upgrade to 3.73's to get in three higher RPMs quicker, there, you have a higher multiplier on your torque down low til you build enough boost/power. The down as side would be a very squirrelly second, and or shallow gears/an extra shift possibly.

To be honest and upfront, I know very little about automagics, so please forgive me if my ignorance shines too brightly.

Trust me you do not want 373's with the 6R80....not at all. The 1/2 gear on these are geared like 410's already....this is not the old school setup where "don't fear the gear" is the motto....your gearing is fine, any more and all you will do is spin/engage traction control which is no fun at all.

 

[Juben]

Ha, yeah Greg, but off boost you still had a relatively torquey 5L pulling you around...been there done that. Guessing a little 140 ci 4 cyl in a heavy car might feel a bit different when waiting for the boost to show up...

Truthfully, all of the shop cars have been base/Premium cars without the PP. The PP is the only way to get the 3.55s, so most of those autos have been running the 3.15s and are posting all of the good numbers (or it would seem).

 

[greg hazlett]

5.0 or 2.3 the 6r80 is still geared the same.


Here are the specs for the 6R80:

Gear ratios:

1 2 3 4 5 6 R
4.17 2.34 1.52 1.14 0.86 0.69 3.40

 

[Herr_Poopschitz]

Truthfully, all of the shop cars have been base/Premium cars without the PP. The PP is the only way to get the 3.55s, so most of those autos have been running the 3.15s and are posting all of the good numbers (or it would seem).

I agree the 3.15's are def ok for a stock turbo. Brake boost to 8-10 psi and the car'll launch pretty well.

The question is, once going to a larger turbo that potentially won't make boost w/ the stock converter, will it be a slug off the line and have to wait a second before the power comes in?

If yes, 3.55s would help get into the powerband (boost) quicker than the 3.15s...but that much of a difference?:shrug: I guess I'll find out once people start buying the kits.

 

[Juben]

I have the 3.55s, so I should be able to tell you shortly what effect it'll have on brake boosting and the like. [emoji106]

 

[MAPerformance]

I agree the 3.15's are def ok for a stock turbo. Brake boost to 8-10 psi and the car'll launch pretty well.

The question is, once going to a larger turbo that potentially won't make boost w/ the stock converter, will it be a slug off the line and have to wait a second before the power comes in?

If yes, 3.55s would help get into the powerband (boost) quicker than the 3.15s...but that much of a difference?:shrug: I guess I'll find out once people start buying the kits.

Well with me making 352hp/410tq on the stock turbo tonight I'm thinking for someone that is looking to get off the line a little faster with an AT we can do a smaller turbo like the Precision 5558 and it will definitely build boost off the line. Plus with Cobb working hard on some transmission "tweaks" we might see a higher stall in the future

 

[gUiTo]

Hey Adam, what do you figure the hp and torque is at the crank for that car? is it 15% driveline loss or less with the new Mustang's (not sure if i am calculating correctly or not) at 15% wouldnt it be close to 415 horsepower at the crank? I am really interested in what you guys end up making on the engine build.

 

[Tamadrummer88]

Hey Adam, what do you figure the hp and torque is at the crank for that car? is it 15% driveline loss or less with the new Mustang's (not sure if i am calculating correctly or not) at 15% wouldnt it be close to 415 horsepower at the crank? I am really interested in what you guys end up making on the engine build.

The loss lately seems around 12%.

Sponsored