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Rotrex C30-94 supercharger install and modification: pulley choice

Old 10-17-2018, 08:06 AM
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Question Rotrex C30-94 supercharger install and modification: pulley choice

Hi everybody,

I have a TTS Performance Supercharger kit, base on a Rotrex C30-94, RC750 injectors and Walbro 255 l/h fuel pump.
This kit has been removed from a RHD AP1 and the french tuner decided to limit the engine RPM to 8500 "by safety". The car made 376 bhp and 322 Nm.

I now have to install it back on my RHD AP1 my2002 (with 2004 2.0L inside) and might do some modifications on the installation (some things can be better fixed), and maybe on the piping and intercooler.

But first I have one main question: the crank pulley is a 125 mm and I suppose the SC pulley to be a "standard" 110 mm (I have to check), which is made to respect the max input speed of 10 500 rpm for the C30-94, with a 9 000 rpm engine speed.

The question is: if I tune the EMS to max 8 800 rpm (or less), then I can go for a 105 mm SC pulley and still respect the max C30-94 speed. Would this be a way to get more boost and mode torque/bhp ???
Or is it better to stay with 110 mm pulley and full 9 000 rpm range ???

Thanks for your answers.
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Old 10-19-2018, 01:20 PM
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All the trq you will make out of that motor happens under 8500 rpm supercharged and minimal increase in hp as it starts to taper off but still does increase above 8500. So that said, your going to make more peak trq output with the current higher boost pulley but 8500rpm limit, and hp may be a wash because of the lower boost pulley option but higher engine redline. I would probably stick with the higher boost pulley and lower rev limit in this particular case.
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Old 10-23-2018, 12:09 AM
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Thank you for your answer and precision.
I still have to check which pulley I have, all I know is that the tuning has been made with a 8500rpm redline but I am not sure of the pulley size actually fitted.
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Old 10-23-2018, 12:16 AM
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Originally Posted by pizzai69 View Post
Thank you for your answer and precision.
I still have to check which pulley I have, all I know is that the tuning has been made with a 8500rpm redline but I am not sure of the pulley size actually fitted.
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Old 11-16-2018, 01:52 AM
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As my TTS kit is an old version (2015 with C30-94), I have some problems to find precise technical informations on it.
So yesterday, I made a lot of measurement on the various parts of my kit, in ordre to know what could be improved.

Here is what I have:
  • Supercharger is Rotrex C30-94, inlet 3", outlet 2".
    Rotrex théorical data: power range 197-435hp, max mass flow rate 0,39kg/s, max pressure ratio 2,52, max input rpm 10 500. (see complete datasheet)
  • Crank pulley is ø125mm, SC pulley already is ø105mm. => that means I have to keep a tune with max 8800rpm to respect the SC max rpm.
  • Oil cooler (for Supercharger oil) core is: 230x75x50mm (9"x2.95"x2").
  • Intercooler core is 450x160x90mm (17,7"x6,3"x3,5"). Inlet is ø50mm (2") and outlet is ø63mm (2,5").
  • Intake (air filter) piping is ø76mm (3"), hot piping is ø50mm (2"), cold piping is ø63mm (2,5").
The installation on the previous car was made that way:









The hot piping goes on the left of the engine radiator, and then comes in the intercooler from the top right end.
The cold piping comes out of the intercooler from the left, turns around the radiator, passes just next to the radiator drain valve, and the goes up to the throttle body.


What I want to study is:
- improving intercooler size
- improving hot & cold piping routing, and size maybe ?
- improving air intake with a "K&N CAI Style" home made compartment/partitioning

The objectives are:
- burn cooler air, to reduce engine heat
- get some more bhp if possible

I also have the possibility to make a flexfuel tune: SP98 (in France, is equal to US Oct 93 i think) and E85 (Ethanol 85%). But not sure about the interest, and the risks of E85 for the fuel tank/pump/lines/injectors if my car stays 1 month or more without running (which is frequent).


I would be glad to read your comments and advices on my build.
Thanks.
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Old 11-16-2018, 02:16 AM
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Just run a simple water/meth injection kit, will lower IAT better then anything you will do with the intake routing, or even running E85 for that matter. Cant lose.
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Old 11-16-2018, 02:21 AM
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I absolutely don't know anything about water/meth injection. Supercharging is already new to me, so going with injection is quite affraying for me to be honest
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Old 11-16-2018, 08:24 AM
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My car sits for several months during the winter with E85 in tank, no problems.
If your injectors and fuel pump are up to the task you can get a lot more power with a E85 tune.
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Old 11-16-2018, 06:39 PM
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Pizzai69...

This might be of some help as I have already done some of this...
https://www.s2ki.com/forums/s2000-fo...-92-a-1086804/

mods begin here...
https://www.s2ki.com/forums/s2000-fo.../#post23945935

Last edited by 06S2k07Si; 11-16-2018 at 06:45 PM.
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Old 11-17-2018, 04:23 AM
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Originally Posted by flanders View Post
My car sits for several months during the winter with E85 in tank, no problems.
If your injectors and fuel pump are up to the task you can get a lot more power with a E85 tune.
Thanks for your experience with E85 !
E85 fuel pumps are rare near my home, but they exist. So a flexfuel tune can be interesting !
I have RC 750 injectors, and Walbro 255 pump: following the first informations I found, this seems to be too small for E85 400bhp tune. It looks like I would have to go ID 1000 at least...

Originally Posted by 06S2k07Si View Post
Pizzai69...

This might be of some help as I have already done some of this...
https://www.s2ki.com/forums/s2000-fo...-92-a-1086804/

mods begin here...
https://www.s2ki.com/forums/s2000-fo.../#post23945935
I know your fabulous thread, but had not read it entire. Thanks for the second link for the piping and IC modification, which is quite similair to what I aim to do.
Your car is awesome!

I won't reach that level of perfection, neither that level of power with my C30, but some modifications are interesting

I have 3 options:
- don't touch anything, stay 370bhp
- change IC for a bigger one, upgrade hot piping to 2.5" (even if blower output is only 2"...) and cold piping to 3" => maybe 20bhp to hope ??
- do that AND change injectors fuel pump + add flexfuel E85 sensor and tune => maybe 40-50bhp to hope ??
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