GoatOfRafin's Rotrex build
#22
350Z-holic
iTrader: (13)
Nice! Looking forward to the progress!
I still have that exhaust timing gear (if you need it?)
I still have that exhaust timing gear (if you need it?)
#23
New Member
Thread Starter
RevUp motor with a Rotrex C38/91, mount by Auto-Gruppen
RevUp motor custom pulley addition for spinning the Rotrex
RevUp motor with a Rotrex C38/91, mount by Auto-Gruppen. Oil pan, probably copy of AMS
RevUp motor with a Rotrex C38/91, mount by Auto-Gruppen
#24
New Member
Thread Starter
More news! Dyno soon to follow!
RevUp engine bay with the Rotrex supercharger
Custom crank pulley for driving the Rotrex
Rotrex oil cooler, behind the intercooler
Rotrex oil reservoir
Engine bay with Frozenboost intercooler
Frozenboost intercooler customized to fit at the front bumper bar and with same side entrance/exit (#2)
Frozenboost intercooler customized to fit at the front bumper bar and with same side entrance/exit (#1)
Cold side pipe to throttle body
RevUp engine bay with the Rotrex supercharger
Custom crank pulley for driving the Rotrex
Rotrex oil cooler, behind the intercooler
Rotrex oil reservoir
Engine bay with Frozenboost intercooler
Frozenboost intercooler customized to fit at the front bumper bar and with same side entrance/exit (#2)
Frozenboost intercooler customized to fit at the front bumper bar and with same side entrance/exit (#1)
Cold side pipe to throttle body
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BluestreamDE (03-18-2018)
#25
350Z-holic
iTrader: (13)
GEORGE!!! How have you been?!?!?
#26
New Member
Thread Starter
After lots of experimentation, a 85mm pulley was fit to the Rotrex, driven from a 156mm crank pulley and we got 500hp at the crank. It seems that the Rotrex behaves quite differently from other centrifugal superchargers in the market and the efficiency map provided needs to be interpreted in a quite different manner.
Rotrex C38-91, spun at ~12800 rpm at the pulley, 0.8bar max boost, 11.5 AFR, 8.8:1 compression, stock ignition timing
Rotrex C38-91, spun at ~12800 rpm at the pulley, 0.8bar max boost, 11.5 AFR, 8.8:1 compression, stock ignition timing
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BluestreamDE (07-10-2018)
#28
New Member
Thread Starter
Upgrades are scheduled, stay tuned!
-hint- The C38/91 gets even bigger: behold the C38R-112!
Rotrex C38R box
Rotrex C38R downside
Rotrex C38R (pulley adapter side)
Rotrex C38R impeller
-hint- The C38/91 gets even bigger: behold the C38R-112!
Rotrex C38R box
Rotrex C38R downside
Rotrex C38R (pulley adapter side)
Rotrex C38R impeller
The following 4 users liked this post by goatofrafin:
350z-Helsinki (03-25-2020),
bealljk (01-30-2019),
BluestreamDE (01-30-2019),
Conway_160 (01-30-2019)
#29
350Z-holic
iTrader: (13)
Nice! Congrats on your progress - looks impressive!
The following users liked this post:
goatofrafin (01-31-2019)
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bealljk (04-27-2019)
#31
New Member
Thread Starter
Ok, so after a few months waiting and repairing, the results are: +0.35bar boost, +70bhp, +80Nm. Boost was a bit less than 1.2bar spinning the C38R at full speed. Some things worth noting are:
- Despite the 8.8:1 compression, regular gas dictated a -10 decrease of ignition advance after 5500rpm, going to 16deg of value. We decided to use 100oct gas in order to go to 20deg
- With 6ribs belt, there was slippage after 4500rpm. We went with 8rib belt which had no slip. However, we misdiagnosed belt slippage near red line due to the fact that stock ECU has soft rev limiting.
Hope this will give you insight as to whether you will be using a C38R or not...
- Despite the 8.8:1 compression, regular gas dictated a -10 decrease of ignition advance after 5500rpm, going to 16deg of value. We decided to use 100oct gas in order to go to 20deg
- With 6ribs belt, there was slippage after 4500rpm. We went with 8rib belt which had no slip. However, we misdiagnosed belt slippage near red line due to the fact that stock ECU has soft rev limiting.
Hope this will give you insight as to whether you will be using a C38R or not...
Last edited by goatofrafin; 05-01-2019 at 11:40 PM. Reason: Wrong ignition advance values and belt slippage diagnosis
The following 2 users liked this post by goatofrafin:
bealljk (04-27-2019),
OldManZ350 (04-29-2019)
#34
New Member
Thread Starter
Thanks! Well the numbers should be much higher according to Rotrex but for some reason, they are not... Other than that, the bracket from Auto-Gruppen is a perfect fit but having the supercharger so low is both a good and a bad thing; the good thing is that it always sucks fresh cold air and the bad thing is that no proper air filter can fit and there is an increased danger of sucking water.
Last edited by goatofrafin; 05-01-2019 at 07:01 AM.
#35
hi goatofrafin,
i fodn your post on google because i'am searching for c38r expieriences.
i'm driving an Opel Calibra 4x4 V6 with 3,0 litres and an c38-81. at 520HP and 1,3bar with "only" 12300rpm at the pulley.
I was surprised u only reach 500HP even with overreving the c38-91.
I think the reason is your intercooler.
I tried several intercooler by myself on my car. I was able to increase my boost from 0,9bar to 1,3bar only by changeing the intercooler. First i started with a cheap 600x180x60 bar and plate. Then i tried a tube and fin and got 1,1bar. At the moment i have a huge 600x300x90 Bar and plate Treadstone intercooler with 1,3bar boost.
I think, if u replace your intercooler with another one which has its entrance and exit on the other side and as big as possible u could increase your power-output and boost by far.
A friend of mine has the same rotrex-setup and placed a intercooler like u in his car, he got only 0,6 bar of boost and about 360hp.
I dont want to be a smartass. I just thought it could be interesting for u.
Best Regards Thomas
i fodn your post on google because i'am searching for c38r expieriences.
i'm driving an Opel Calibra 4x4 V6 with 3,0 litres and an c38-81. at 520HP and 1,3bar with "only" 12300rpm at the pulley.
I was surprised u only reach 500HP even with overreving the c38-91.
I think the reason is your intercooler.
I tried several intercooler by myself on my car. I was able to increase my boost from 0,9bar to 1,3bar only by changeing the intercooler. First i started with a cheap 600x180x60 bar and plate. Then i tried a tube and fin and got 1,1bar. At the moment i have a huge 600x300x90 Bar and plate Treadstone intercooler with 1,3bar boost.
I think, if u replace your intercooler with another one which has its entrance and exit on the other side and as big as possible u could increase your power-output and boost by far.
A friend of mine has the same rotrex-setup and placed a intercooler like u in his car, he got only 0,6 bar of boost and about 360hp.
I dont want to be a smartass. I just thought it could be interesting for u.
Best Regards Thomas
The following users liked this post:
goatofrafin (06-01-2019)
#36
New Member
hi goatofrafin,
i fodn your post on google because i'am searching for c38r expieriences.
i'm driving an Opel Calibra 4x4 V6 with 3,0 litres and an c38-81. at 520HP and 1,3bar with "only" 12300rpm at the pulley.
I was surprised u only reach 500HP even with overreving the c38-91.
I think the reason is your intercooler.
I tried several intercooler by myself on my car. I was able to increase my boost from 0,9bar to 1,3bar only by changeing the intercooler. First i started with a cheap 600x180x60 bar and plate. Then i tried a tube and fin and got 1,1bar. At the moment i have a huge 600x300x90 Bar and plate Treadstone intercooler with 1,3bar boost.
I think, if u replace your intercooler with another one which has its entrance and exit on the other side and as big as possible u could increase your power-output and boost by far.
A friend of mine has the same rotrex-setup and placed a intercooler like u in his car, he got only 0,6 bar of boost and about 360hp.
I dont want to be a smartass. I just thought it could be interesting for u.
Best Regards Thomas
i fodn your post on google because i'am searching for c38r expieriences.
i'm driving an Opel Calibra 4x4 V6 with 3,0 litres and an c38-81. at 520HP and 1,3bar with "only" 12300rpm at the pulley.
I was surprised u only reach 500HP even with overreving the c38-91.
I think the reason is your intercooler.
I tried several intercooler by myself on my car. I was able to increase my boost from 0,9bar to 1,3bar only by changeing the intercooler. First i started with a cheap 600x180x60 bar and plate. Then i tried a tube and fin and got 1,1bar. At the moment i have a huge 600x300x90 Bar and plate Treadstone intercooler with 1,3bar boost.
I think, if u replace your intercooler with another one which has its entrance and exit on the other side and as big as possible u could increase your power-output and boost by far.
A friend of mine has the same rotrex-setup and placed a intercooler like u in his car, he got only 0,6 bar of boost and about 360hp.
I dont want to be a smartass. I just thought it could be interesting for u.
Best Regards Thomas
Is this bracket currently in production to adapt the rotrex to the VQ engine?
#37
New Member
Thread Starter
hi goatofrafin,
i fodn your post on google because i'am searching for c38r expieriences.
i'm driving an Opel Calibra 4x4 V6 with 3,0 litres and an c38-81. at 520HP and 1,3bar with "only" 12300rpm at the pulley.
I was surprised u only reach 500HP even with overreving the c38-91.
I think the reason is your intercooler.
I tried several intercooler by myself on my car. I was able to increase my boost from 0,9bar to 1,3bar only by changeing the intercooler. First i started with a cheap 600x180x60 bar and plate. Then i tried a tube and fin and got 1,1bar. At the moment i have a huge 600x300x90 Bar and plate Treadstone intercooler with 1,3bar boost.
I think, if u replace your intercooler with another one which has its entrance and exit on the other side and as big as possible u could increase your power-output and boost by far.
A friend of mine has the same rotrex-setup and placed a intercooler like u in his car, he got only 0,6 bar of boost and about 360hp.
I dont want to be a smartass. I just thought it could be interesting for u.
Best Regards Thomas
i fodn your post on google because i'am searching for c38r expieriences.
i'm driving an Opel Calibra 4x4 V6 with 3,0 litres and an c38-81. at 520HP and 1,3bar with "only" 12300rpm at the pulley.
I was surprised u only reach 500HP even with overreving the c38-91.
I think the reason is your intercooler.
I tried several intercooler by myself on my car. I was able to increase my boost from 0,9bar to 1,3bar only by changeing the intercooler. First i started with a cheap 600x180x60 bar and plate. Then i tried a tube and fin and got 1,1bar. At the moment i have a huge 600x300x90 Bar and plate Treadstone intercooler with 1,3bar boost.
I think, if u replace your intercooler with another one which has its entrance and exit on the other side and as big as possible u could increase your power-output and boost by far.
A friend of mine has the same rotrex-setup and placed a intercooler like u in his car, he got only 0,6 bar of boost and about 360hp.
I dont want to be a smartass. I just thought it could be interesting for u.
Best Regards Thomas
Moreover, if there is no leakage, the air will get in somehow. I can understand pressure loss but not air loss if the whole plumbing is air tight. Do you have a pre/post Rotrex dyno pull? What dyno are you using? Please share your dyno charts!
P.S.: At wikipedia, the V6 Calibra is 2.5 liters. What is your model and how much HP was it making NA? Did you swap with the X30XE making 208bhp?
Last edited by goatofrafin; 06-01-2019 at 08:52 AM.
#38
This was my Dyno last year, with the 1,1bar setting, i dont know which dyno-brand ist was. just wanted to see some numbers
The Calibra was a naked 2.0Turbo 4x4 frame. But i already have a 2.0T calibra, so i decided to put in the X30XE 3.0V6 from the Omega B with stock 211HP. I used the intake manifold from Z32SE Vectra C and some Headers build by my own. I had around 230HP naturally aspirated.
I reinforced the Engine with Woessner Pistons (8,5:1) and Pauter X-Shaft Conrods and some other modifications.
I'm pretty satisfied with the performance, did some comparisons at the trafficlight and its really quick. Other cars with the same Power are slower. 2 Weeks ago i was on a carmeet with 1/8 mile racing. I had a race vs. a Calibra 2.0T with 400HP and racing-4x4 (50:50 distribution fully locked). I lost the start but mananged to win this race (other car was even 250kg lighter).
A friend of mine has the same rotrex-setup and placed a intercooler like u in his car, he got only 0,6 bar of boost and about 360hp.
Last edited by Lumberjack2302; 06-17-2019 at 10:45 AM.
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