I have the chance to get a used Rotrex C30-84 for a very good price so I want to ask if would also work fine on the 1zz-fe engine. All other conversions are equiped with the C30-94 but I don't want that much HP.
My target is around 200-220 hp on the stock engine, including all necessary parts to get a stable set-up. Almost like the Komo-tec setup for the Lotus elise.
I also need the diameter of the crankshaft wheel to calculate the right diameter of the rotrex wheel.
Hope you can help me. I need some quick information because I don't know how long the rotrex is available.
My target is around 200-220 hp on the stock engine, including all necessary parts to get a stable set-up. Almost like the Komo-tec setup for the Lotus elise.
J_factors project
spyder forum MR2 project
Discussion at Celica-Community.de
Phoned with Komo-Tec in Germany (Rotrex specialist) they use the 30-74 for the Lotus Elise S
searched in several other forums.
I've just phoned with Evo-F in Austria (Rotrex specialist and importer for Rotrex in Austria) They said the C30-84 would be fine for the 1zz
I don't think it would be a problem to use the 30-84 but I want to be sure.
I have to say that I'm not an expert, I only read a lot about it and talked a few times with real experts about the conversion.
search celica-club.co.uk ... Se7en motorsports are currently offering a supercharger kit for the 1zz-fe exactly with the c30/94 ... i am looking to go that way too ..
I'd say that for the 1zz on stock internals (rods especially!) you're better off going for the C30/84 trim as this will put you right at the power output you're looking for (ie 220ish) the good thing with a Rotrex (or any centrifugal charger) is that boost builds progressively with revs and it's much less likely to snap a rod than the big hit of low down torque and power that a roots blower would.
I'm running a C30/94 on a 2zz and have the largest pulley wheel and I'm still at 290bhp on a sick engine. The C30/94 moves a lot of air. Realistcally I reckon it's capable of making enough boost to see 400bhp realistically. With that in mind it's fair to assume that 220bhp is at the very low end of it's efficiency scale and you're paying extra for something you aren't using nearly well enough. Se7en has the same set up (built head/brand new MWR block) and is seeing 14PSI and 310bhp and still on the large pulley.
I think you're on the right track with where you're going. Shame I can't give you a definite answer on the size of the crank pulley :shrugs: sorry.
Good luck with the project though. Be interesting to see how you get on.
I will do this using YOUR info that the crank pulley is 135 mm. I measured the 2zz and came up with 127mm. I don't know what a 1zz crank pulley is as I have never measured one and don't have one handy to measure. I will show you how to figure it using an online pulley calculator so you can actuall measure yours and be sure of the info.
Zero out any numbers already on the calculator.
Put 135 in the Powered Driver Pulley Diameter. (Your Crank Pulley Measurement)
Put 100 in Driven Object Pulley Diameter (Or whatever pulley you wish to use on the Rotrex)
Put 7300 in Input (Driven) RPM (Or whatever redline you choose to use)
Push calculate button.
It will give you 9855. That is your input shaft speed for the Rotrex. You will have to check what the maximum speed that Rotrex advises for the C30-84 to see if it is below that number. The 30-94 the input shaft max is 10,500. I don't know the 84 limit.
A couple of things: Leave the rest of the questions in the calculator blank, they are not needed for your calculations.
With the C30-94 At the maximum input shaft speed on my Rotrex setup ( no restrictor and 2zz engine)I get 13-13.5 PSI.
That should get you the info you need to decide what pully you need to get what you want with the Rotrex. Hope that helps you out.
I honestly think that the 1zz has a 5 inch (127mm) crank pulley but that is something you will have to check on.
If you haven't already done so, you might want to concentrate your investigation over on the Spyderchat.com Forum, where R&D work on 1ZZ and 2ZZ engines started over 3 years ago, and with at least a half-dozen on-the-road examples currently (and several more in process).
As far as pulley size, Grumpy has an Excel spreadsheet set up to work the pulley-size/RPM relationships, as the rotational redline of the Rotrex head unit is critical.
As far as boost potential and vulnerability of the 1ZZ's internal components, we solved that issue using the C30-94 by having a machined "restrictor" fitted into the Rotrex's intake (compliments of CeeDapp), which effectively restricts the amount of air the Rotrex can suck in at higher RPM's. When I was running a 1ZZ with the C30-94 and an A/W intercooler setup, we were tuned to only get about 225 RWHP using this restrictor (so as not to stress the rods). IIRC, the OD of the Rotrex inlet is abot 75mm (and the ID obviously a little less), and the ID on the restrictor we used was 42mm. Now in going to a 2ZZ setup that restrictor will be removed.
As a side note on pulley size, I wanted to run the smallest pulley practical to achieve the best low-end/mid-range throttle response, and for that an 85mm pulley limited the engine RPM to around 7200-7300. In other words, more boost sooner (i.e., at lower RPM's) but limiting the engine RPM's at the top. I plan on going the same route on the 2ZZ, where between the Rotrex and the Piper cams, lift can be set to kick in much sooner. And even if I never go any higher than 7300 RPM's, I'll be enjoying that extra punch in the 2500-5000 RPM range all-day-long!
As far as boost potential and vulnerability of the 1ZZ's internal components, we solved that issue using the C30-94 by having a machined "restrictor" fitted into the Rotrex's intake (compliments of CeeDapp), which effectively restricts the amount of air the Rotrex can suck in at higher RPM's. When I was running a 1ZZ with the C30-94 and an A/W intercooler setup, we were tuned to only get about 225 RWHP using this restrictor (so as not to stress the rods). IIRC, the OD of the Rotrex inlet is abot 75mm (and the ID obviously a little less), and the ID on the restrictor we used was 42mm. Now in going to a 2ZZ setup that restrictor will be removed.
I had a talk with ccr-racing.dk , they're Rotrex specialists and are also working with restrictors. As far I was also considering a restrictor and asked them to produce one for me, they told me, a very good intercooler setup is mandatory with a restrictor because the restrictor will heat up the air much more. I got a A2W IC, so it would be fine for me, but I am considering bleeding boost is a better choice, so I'll probably research for a bypassvalve.
Then he needs to simply change the 135 to 127 when he does his calculations. Thanks for the confirmation. I thought it was 127mm but have never measured one from a 1zz.
Unless the Rotrex makers or retailers can help you, it'll be a hit-or-miss. But one factor will be the shape and aerodynamic efficiency of the restrictor. You might want to try 25mm for a starter.
Which bracket do you have? The one from the J Factor? I allready have the DWG file from his project.
I try to get the bracket from mabbs (se7enmotorsports) because he has modified it and it's better to fit than the other one.
The kit is costum made. I still try to get the rest of the parts togheter. It will take a little time because I need some more information about some of the parts I will buy.
by @the kit@ i mean the supercharger and the oil things ... the sc kit and give me an e-mail ... i have the se7en's bracket i believe ... i downloaded it somewhere from there if i remember correctly ...
100% Leakproof up to 40 bar 1.4301 stainless steel
Inner Diameter 40mm
Outer Diameter 52mm
Extrem flexible.
It`s a test, but I think it will work properly. :wiggle:
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