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GTM Stage 1.5 supercharger build

Originally Posted by Super Werty When you go stage 2 is the only difference the larger -91 trim Rotrex? Reason I ask is because... I was the first to run

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Old 09-15-2013, 12:52 PM   #46 (permalink)
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Originally Posted by Super Werty View Post
When you go stage 2 is the only difference the larger -91 trim Rotrex?

Reason I ask is because...

I was the first to run the -91 on my Toyota Tacoma. Underdog Racing Development made the kit with a -81 but I asked for a -91 with a larger pulley.

What we ended up finding out was that I was making way more midrange power and a peak of about 450rwhp on a less aggreesive timing map on only 9.7 psi. While the guys running the -81 trim made less midrange and took a whopping 15 psi to hit 450rwhp.

The -91 trim also provided significantly lower boost temps

Wonder if GTM has tried the -91 with a larger pulley.
The 1.5 kit does use the smaller blower but it provides more mid range torque and in my case it has also given me more hp than stage 2.
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Old 09-15-2013, 06:35 PM   #47 (permalink)
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The 1.5 kit does use the smaller blower but it provides more mid range torque and in my case it has also given me more hp than stage 2.
I am curious what you are comparing to? Did you try stage 2 and then go back to 1.5?
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Old 09-15-2013, 06:42 PM   #48 (permalink)
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I am curious what you are comparing to? Did you try stage 2 and then go back to 1.5?
There is no one on this forum with stage 1,1.5,2 that has more power than me plus dyno results are on the forum.
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Old 09-15-2013, 06:49 PM   #49 (permalink)
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There is no one on this forum with stage 1,1.5,2 that has more power than me plus dyno results are on the forum.
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Old 09-15-2013, 07:47 PM   #50 (permalink)
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There is no one on this forum with stage 1,1.5,2 that has more power than me plus dyno results are on the forum.
Anyone with Stage 2 and the same supporting mods as you? Same tuning? too many factors...not saying you are wrong, I believe you have the highest hp but the -91 is a larger more efficient blower
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Old 09-15-2013, 08:06 PM   #51 (permalink)
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Anyone with Stage 2 and the same supporting mods as you? Same tuning? too many factors...not saying you are wrong, I believe you have the highest hp but the -91 is a larger more efficient blower

It doesn't matter how efficient it is it doesn't make more power and thats whats important.
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Old 09-15-2013, 08:12 PM   #52 (permalink)
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It doesn't matter how efficient it is it doesn't make more power and thats whats important.
Sure it does. The -91 trim flows 11% more than the -81. You may have the record for now, but I have no doubt someone running a -91 will be able to easily surpass your hp and torque curve

more air and less heat is going to make more power. I would say for now you probably have a superior tune than others with a stage 2
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Old 09-15-2013, 08:22 PM   #53 (permalink)
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Sure it does. The -91 trim flows 11% more than the -81. You may have the record for now, but I have no doubt someone running a -91 will be able to easily surpass your hp and torque curve

more air and less heat is going to make more power. I would say for now you probably have a superior tune than others with a stage 2

Not just for now but the last 2.5 years ,thats alot of kits sold since then.
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Old 09-15-2013, 08:24 PM   #54 (permalink)
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I thought Jamaica was close to 550 WHP with the Stage 2 kit and he blew his 7AT then sold the car.
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Old 09-15-2013, 08:30 PM   #55 (permalink)
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I thought Jamaica was close to 550 WHP with the Stage 2 kit and he blew his 7AT then sold the car.
He had 504rwhp 362rwtq stage 2

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Old 09-15-2013, 08:33 PM   #56 (permalink)
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He had 504rwhp 362rwtq stage 2
Thats right, I did just find one of Sams dynos Stage 2 stock exhaust and cats 523.9 HP 372.1 TQ on 11 PSI
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Old 09-15-2013, 08:42 PM   #57 (permalink)
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Thats right, I did just find one of Sams dynos Stage 2 stock exhaust and cats 523.9 HP 372.1 TQ on 11 PSI
But the thing that not a lot of people know is that they use the smallest pulley possible to get those numbers,I should know I tried to buy that pulley from Sam he won't sell it to me claiming it will over spin the blower.
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Old 09-15-2013, 08:48 PM   #58 (permalink)
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Sounds like a conspiracy to not hurt Stage 2 sales
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Old 09-15-2013, 08:51 PM   #59 (permalink)
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Sounds like a conspiracy to not hurt Stage 2 sales
Nobody has noticed that no matter what kit you buy no one that I know of has beat their numbers sounds fishy.
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Old 09-15-2013, 09:10 PM   #60 (permalink)
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well again not really talking so much about peak numbers here. Looking for the curve.

Congrats on your kit though, good power. Just not enough for me
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