FBM Base Kit installed on BRZ Automatic

[feldy]

Originally Posted by FullBlown

Final numbers @ 9.5 psi 93 pump gas

Maybe I missed it. But have you guys noticed the automatic transmission disengaging at all past the stock rev limiter?

[carbonBLUE]

Originally Posted by feldy

Maybe I missed it. But have you guys noticed the automatic transmission disengaging at all past the stock rev limiter?

it doesnt look like it, this is a "locking" converter so our car doesnt have the same problem as high stall or non locking converters. If any slippage was the case then you would see a noticeable drop in tq at the end of the RPM range

if there was any slippage, the best way to determine that would be to go down to the strip and run 1 run down the track then calculate
gear ratio
tire diameter
rpm when crossing the finish line
speed at trap
and where the rpm's are supposed to be without slip at that specific trap speed

find the difference then calculate for the slip %

Originally Posted by Tansey86

Through a manual and gtx35r it made another 90 wheel. Interesting. Awesome power though.

well a larger turbo at the same PSI will make better numbers because its flowing more air per minute than a smaller turbo at the same PSI

best example right here on the forum
FBM 9.5 PSI 307 whp GT28
PTuning 6.2 PSI 298 whp GT30

it "looks" like PTuning did a better job, but in reality... they are moving about the same amount of air because of the different turbo sizes, so they make relatively the same power...

EDIT: looking back at it the 521 whp FBM was running a GT35 and the base kit on this automatic is running a GT28.... I think i found out where the 90 whp discrepancy is coming from
If im wrong just let me know @FullBlown im just going off the title "base kit" so i assume its the stage 1 kit which comes with the gt28

EDIT EDIT
Flow rates
GTX2867 51 lb/min
GTX35R 71.5 lb/min

[sw20kosh]

Originally Posted by carbonBLUE

it doesnt look like it, this is a "locking" converter so our car doesnt have the same problem as high stall or non locking converters. If any slippage was the case then you would see a noticeable drop in tq at the end of the RPM range

if there was any slippage, the best way to determine that would be to go down to the strip and run 1 run down the track then calculate
gear ratio
tire diameter
rpm when crossing the finish line
speed at trap
and where the rpm's are supposed to be without slip at that specific trap speed

find the difference then calculate for the slip %



well a larger turbo at the same PSI will make better numbers because its flowing more air per minute than a smaller turbo at the same PSI

best example right here on the forum
FBM 9.5 PSI 307 whp GT28
PTuning 6.2 PSI 298 whp GT30

it "looks" like PTuning did a better job, but in reality... they are moving about the same amount of air because of the different turbo sizes, so they make relatively the same

EDIT EDIT
Flow rates
GTX2867 51 lb/min
GTX35R 71.5 lb/min

What I cant wrap my head around is how pt tuning was able to get better low end torque and better/same boost onset. Am I looking at this right? Are the ball bearing turbos THAT much better?! It's bigger so it should be laggier than gt28?

[FullBlown]

Originally Posted by sw20kosh

What I cant wrap my head around is how pt tuning was able to get better low end torque and better/same boost onset. Am I looking at this right? Are the ball bearing turbos THAT much better?! It's bigger so it should be laggier than gt28?

The real test would be to grab a log on the street and see how the turbos spool on the street between all the kits to make an accurate comparison

I hate to get into dyno debates, but we own both a Dyno dynamics and a Dynojet here. On our Dyno dynamics,I can load the car at 3000rpm and let the boost build and then make my sweep. The boost curve would look totally different from what I could do on our dynojet. Our dynamics can also adjust how much load you can throw at the rollers as well.

The turbo's we are using are ball bearing, gt28's aren't available in JB

[carbonBLUE]

Originally Posted by sw20kosh

What I cant wrap my head around is how pt tuning was able to get better low end torque and better/same boost onset. Am I looking at this right? Are the ball bearing turbos THAT much better?! It's bigger so it should be laggier than gt28?

Originally Posted by FullBlown

The real test would be to grab a log on the street and see how the turbos spool on the street between all the kits to make an accurate comparison

I hate to get into dyno debates, but we own both a Dyno dynamics and a Dynojet here. On our Dyno dynamics,I can load the car at 3000rpm and let the boost build and then make my sweep. The boost curve would look totally different from what I could do on our dynojet. Our dynamics can also adjust how much load you can throw at the rollers as well.

The turbo's we are using are ball bearing, gt28's aren't available in JB

spot on, and also i think they are using the GT30 that has the new impeller design, its more efficient and spools much quicker(earlier) and the boost doesn't drop off as soon

GT3071R 50lb/min
GT3076R 54lb/min
GTX3071R 56lb/min
GTX3076R 65lb/min

my guess it that they are using this GT30 series the X represents the new impeller design

[FullBlown]

The X means its a Billet wheel.

[carbonBLUE]

Originally Posted by FullBlown

The X means its a Billet wheel.

i thought there were design changes with the blades to improve flow?
the X series does flow MUCH better than the GT and T models in all areas of the rpm band, has higher rpm capabilities as well.

so FBM yall should just strap a T-100 (180 lb/min) and call it a day

[KusoSama]

How long has this build been on the road, mileage, and any issues?

[FullBlown]

Originally Posted by KusoSama

How long has this build been on the road, mileage, and any issues?

kit has over 5k miles on it without a hiccup.

[Gixxersixxerman]

Originally Posted by FullBlown

kit has over 5k miles on it without a hiccup.

One year later and how is the auto trans holding up??

[rs999]

Originally Posted by FullBlown

Not sure yet, we are waiting for something to break.

I'd go to SSP and get all their stage 2 auto transmission goodies.

[Gixxersixxerman]

Originally Posted by rs999

I'd go to SSP and get all their stage 2 auto transmission goodies.

Off their site prices, I could easily buy a manual swap.. It's like 3350$, with out shipping.. Once the prices go down that might be an option, but I know where there is a complete 6spm with drive shaft, CM clutch and flywheel for 1000$ now shipped to my door..

[diodelphi]

Originally Posted by FullBlown

kit has over 5k miles on it without a hiccup.

even for 9-11psi boost It seems GTX3071R and EFR 7163 are better than GT28 series ,
Do you have any idea?

[HaloFRS]

Originally Posted by Gixxersixxerman

One year later and how is the auto trans holding up??

I wanna know the same answer. Tranny was all stock with the 400hp? And whats the torque limit of the at tranny?