Rotrex 2ZZ BHP

[J03]

Only 2zz's I know of which had a C38 fitted, were also stroked to 2.0L

Look up Bumblebee's track Celica, he runs a C30 / 90mm pulley combo & is pushing a very meaty 435bhp / 285lbft 

[KRAMSNEHPETS]

power run on sat with the 105mm pulley supplied by rotrex. 90mm one works out at 7400 rpm to avoid overspinning. my stage 2 cams kick in at 5500, new pulley arrives tomorrow, will see how easy it is to swapn over and see if I can get another power run at same session

[KRAMSNEHPETS]

That 90mm pulley should be good for 360+ brake on the 2zz, but you'd only want that on a built engine of course.

Personally I'd go as small as possible for max low down grunt & pull the fuel cut back. Ideally on a 90 pulley that'd mean a paltry 7200 limit, but you have to take in to account how many times you'll actually be up there. So 7800 would be my choice whilst aiming to change gear at 7500.

That might sound low for a 2zz, but with beefier cams & PPE manifold thrown in the mix, I never felt like it was ruining the experience.




What pulley , set up are you running and with what numbers?

[J03]

My old setup used a 100mm pulley as far as I remember, large intercooler, STI MAF, 630cc injectors & Walbro 255 fuel pump.

It hit 346, pulled back to 335 with an 8k limit.

[m1tch]

Only 2zz's I know of which had a C38 fitted, were also stroked to 2.0L

Look up Bumblebee's track Celica, he runs a C30 / 90mm pulley combo & is pushing a very meaty 435bhp / 285lbft 

Hmm that's interesting, will try and find the thread, torque is also in check as the upgraded gearset is apparently rated to 400nm - 295 ft/lbs.

[KRAMSNEHPETS]

Fitted 80mm pulley sunday, got  right size v belt on tonight. Took it for a quick spin, seems to have more low down grunt and certainly more go mid range, but might be my imagination though!. Car booked in for dyno session Tuesday after noon. Rev limit for this pulley is 7400rpm, cams come in at 5500. Car rev limit at the mo is 7500. Am looking forward to the final result

[KRAMSNEHPETS]

had dyno session tuesday. car pulls stronger with smaller pulley. car was mapped up to circa 6000 rpm. power trailed off. was told that they felt "lift" was not working. checked it over. wiring etc all ok. ecu is switched on but would seem to not be sending the signal to make it work.....going back to link supplier and tuner on sunday whilst i am away on holiday to look into it and hopfully sort. wheel bhp was circa 252 at just over 6000 rpm, so hopefull of a nice figure once lift issue is sorted. back from holiday 19th. should collect car same day

[1979scotte]

That is where all power went.
Could be as simple as muck in the filter.
Glad there is progress.

[KRAMSNEHPETS]

VVTI etc works mechanically, wiring and solenoid ok, am told that ECU is not sending signal to make it all work

[1979scotte]

Would be surprised if there was a problem with the Link.
They have lifetime warranty.
Anyway like I said you seem to be getting to the bottom of it.

[KRAMSNEHPETS]

Dropped car off to tuner today. He has been talking to Link about how the ECU has been set up. Looks like lift is switching on then turning off straight away. Hopefully its just going to be a fairly simple session on the dyno to make some adjustments to have lift working and release those top end horses!. Get back from holiday sunday 19th, hope to collect straight  from Gatwick!

[BahnStormer]

VVTI etc works mechanically, wiring and solenoid ok, am told that ECU is not sending signal to make it all work

I've only got a 1ZZ, so never diagnosed this myself, but from what little I know:

The 2ZZ is VVTLi, so it is a little more than just VVTi, so there are some electronic components - the lift does have a few conditions that need to be met to activate the OCV (oil control valve) that pushes control plate that allows the 2nd cam profile to have an effect.

In theory there needs to be an input to the OCV that tells it that the water temp is up (65C?) and that the engine speed is at the lift point (somewhere over 6000rpm).

I'm not sure if that data goes via the ECU and then there needs to be an output from the ECU to the OCV or if this logic is all handled independently.

Assuming the OCV + hydraulics to activate lift are all working okay, then somewhere along the line the signal for the water temp and engine speed either isn't being captured or transmitted properly to the OCV.

Sorry, possibly not of too much use, but just making sure you're not looking for a purely mechanical issue.

[m1tch]

I assume that the lift bolts have been changed?

[KRAMSNEHPETS]

Lift bolts done last year. Am told that lift is working mechanically. Think it is just a configuration thing on Ecu. Am told car will be back on Dino this week

[KRAMSNEHPETS]

Car not ready... Some damaged wires sorted, waiting for new lamba sensor, hopefully dyno after that's fitted and get car working spot on.  Hopefully a nigh ttime collection this week

[KRAMSNEHPETS]

Turns out lift solenoid has packed up along with lamba sensor. Both parts ordered, hope fully fitted and then onto dyno and ready for Sat if my luck holds

[1979scotte]

Glad you've got it sorted.
Thought it would be something mechanical.

[KRAMSNEHPETS]

Think it must have failed a while ago, possible during first mapping session as printed figure was great but I always felt that it didn't feel as quick as it should have done, also no jump in power when lift should have been coming in, thought  that the charger may have masked the lift point. so, am hoping that it will now go into lift at 5500 as max rpm for charger with the smaller pulley is now 7500. fingers crossed that bits arrive, get fitted and mapped in time for me to collect sat. got a nice 60 mile trip early sun morning!

[KRAMSNEHPETS]

Lift and lamba sensors now fitted, lift now working . Now got misfire at high revs on dyno for final mapping..... Plugs looking old and cracking in coils so next step is for them to be renewed and final dyno. hope to collect one night in time to drive it , clean it before meet up on sunday!

[1979scotte]

Think it must have failed a while ago, possible during first mapping session as printed figure was great but I always felt that it didn't feel as quick as it should have done, also no jump in power when lift should have been coming in,

I hope it turns out as you want it but I think that the lack of torque from a rotrex 2zz setup the linear way it delivers power and entering lift at lower rpm may make it FEEL slower than other cars you have driven. Either larger capacity engines or turbos.

Any roadster with over 200 bhp is a quick car yours with 350 is just mental.

[KRAMSNEHPETS]

think it will all be good, don't think lift has worked since rotrex has been fitted so have never had the full power that it should have had. Hope to perhaps get thursday night, sat morning at the latest, might make it to hatton park! 

[KRAMSNEHPETS]

parts hopefully arrive friday. going
to be touch and go to get ready for weekend and sunday meet up......

Sent from my SM-G965F using Tapatalk

[BahnStormer]

I'm just eyeing up the 90mm pulley getting you 220bhp-250bhp at the wheels..... WITHOUT lift working 

Definitely makes a Rotrex'd 1ZZ sound like a good idea!

[1979scotte]

I'm just eyeing up the 90mm pulley getting you 220bhp-250bhp at the wheels..... WITHOUT lift working 

Definitely makes a Rotrex'd 1ZZ sound like a good idea!

Until you bring cost into the equation.
Genuine Garrett gt2860rs 800 quid.
Any rotrex C30 1700 quid.

[BahnStormer]

parade rainer.... 

How much incl install though? Rotrex kit (based on se7en price) is £4.7k... and a turbo build is ~£3k? Maybe £4k for genuine Garrett + standalone ECU?

I'm just eyeing up the 90mm pulley getting you 220bhp-250bhp at the wheels..... WITHOUT lift working 

Definitely makes a Rotrex'd 1ZZ sound like a good idea!

Until you bring cost into the equation.
Genuine Garrett gt2860rs 800 quid.
Any rotrex C30 1700 quid.