Rotrex 2ZZ BHP

[KRAMSNEHPETS]

Day of confusion!
Went to get a tweak on the rolling road to get the best out of it since having a new fuel pump fitted. first run 187 at the wheels taking into account that a 20% reduction from flywheel to wheels would make it 235. Bit surprised as i have a printout from the same rolling road showing 349, less your 20 making it 279!
Was advised that there must have been an error on that print out. Did wonder why it didnt feel as quick as i tbought it should feel!
after a few tweaks is now at 277. at the wheel 221. 42 bhp gained. feels a bit quicker on ride home. will try and do a couple of runs with the race logic at some point

[1979scotte]

Take it to a non 4wd rolling road bet it makes more power.
Assume your charge cooler is doing its job?
What's your manifold and exhaust like?
2zz need proper free flow to see their best.

For comparison my turbo car made 235bhp at redline tunning and when grant had it on a local rolling road it only made 205.

[m1tch]

What torque was it putting out?

[KRAMSNEHPETS]

Torque 165. Monkey wrench racing conversion manifold. Going on local dyno sat at 11am. Doing a long drive in it tomorrow so will see how I "feel" about it and do a few tests with the race logic. Have spoken to Patrick about a custom PPE style exhaust he can make and possible a smaller pulley. Might soon have a TTE exhaust and MWR exhaust manifold for sale!I its a different car , inlet etc, but Celica boys seem to be producing 300 brake with 200  torque. That really where I want to be

[1979scotte]

Do have a boost gauge?
Is it holding boost?

[KRAMSNEHPETS]

graph reads ok

[1979scotte]

graph reads ok

What is peak boost?
I believe you were hitting around 13 psi last time it went to the road.

[KRAMSNEHPETS]

Dyno run at another location booked for sat morning, 90mm pulley ordered

[1979scotte]

Dyno run at another location booked for sat morning, 90mm pulley ordered

Is your current pulley size incorrect?
I thought you were already running the rotrex at max rpm.
Did it come back from TTS with the wrong pulley after your warranty claim?
If you over spin it you will void any remaining warranty.

[1979scotte]

Just to add that I would get a power run for comparison but I wouldn't make any changes to the mapping.
There could be loads of things causing issues.
Just over spinning the rotrex won't be the answer.

[m1tch]

This is why I am going the turbo route, no pulleys to need to swap out, just adjust the boost pressure via the wastegate.

[1979scotte]

This is why I am going the turbo route, no pulleys to need to swap out, just adjust the boost pressure via the wastegate.

No just massive engine bay temps and the associated high oil/coolant temps that go with them.

When a turbo is maxed out it's maxed out.
If it's the same rotrex and pulley as mine then it's maxed out.
And I am using a wastegate/Bov to adjust the boost pressure.

[J03]

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.

[1979scotte]

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.

Do you know how many rpm the rotrex will be doing with a 90mm pulley on a 2zz?

[J03]

Aye too much at the top end    At max revs ~ 13.8% over what's recommended.

Max input Shaft speed on C30-94 is 10,500

On a 90mm pulley a 7200rpm limiter would stop you from over spinning, if you were to keep 8200rpm limiter it would over spin to 11950 ish.

7500rpm ~ 10795 (4.1% over spin)

7800rpm ~ 11100 (8.3% over spin)

[1979scotte]

Aye too much at the top end    At max revs ~ 13.8% over what's recommended.

Max input Shaft speed on C30-94 is 10,500

On a 90mm pulley a 7200rpm limiter would stop you from over spinning, if you were to keep 8200rpm limiter it would over spin to 11950 ish.

7500rpm ~ 10795 (4.1% over spin)

7800rpm ~ 11100 (8.3% over spin)

Very thoroughly explained.
For me it's far too expensive a unit to overspin.
A cheapo eBay turbo it is not.

[m1tch]

Aye too much at the top end    At max revs ~ 13.8% over what's recommended.

Max input Shaft speed on C30-94 is 10,500

On a 90mm pulley a 7200rpm limiter would stop you from over spinning, if you were to keep 8200rpm limiter it would over spin to 11950 ish.

7500rpm ~ 10795 (4.1% over spin)

7800rpm ~ 11100 (8.3% over spin)

Very thoroughly explained.
For me it's far too expensive a unit to overspin.
A cheapo eBay turbo it is not.

How much is the C30-94? I am looking to spend around £1.2k or so on an EFR turbo which should be good for my power goals - still tempted with the supercharger though.

[1979scotte]

Aye too much at the top end    At max revs ~ 13.8% over what's recommended.

Max input Shaft speed on C30-94 is 10,500

On a 90mm pulley a 7200rpm limiter would stop you from over spinning, if you were to keep 8200rpm limiter it would over spin to 11950 ish.

7500rpm ~ 10795 (4.1% over spin)

7800rpm ~ 11100 (8.3% over spin)

Very thoroughly explained.
For me it's far too expensive a unit to overspin.
A cheapo eBay turbo it is not.

How much is the C30-94? I am looking to spend around £1.2k or so on an EFR turbo which should be good for my power goals - still tempted with the supercharger though.

1700

[m1tch]

Aye too much at the top end    At max revs ~ 13.8% over what's recommended.

Max input Shaft speed on C30-94 is 10,500

On a 90mm pulley a 7200rpm limiter would stop you from over spinning, if you were to keep 8200rpm limiter it would over spin to 11950 ish.

7500rpm ~ 10795 (4.1% over spin)

7800rpm ~ 11100 (8.3% over spin)

Very thoroughly explained.
For me it's far too expensive a unit to overspin.
A cheapo eBay turbo it is not.

How much is the C30-94? I am looking to spend around £1.2k or so on an EFR turbo which should be good for my power goals - still tempted with the supercharger though.

1700

Do they do any supercharger larger? Looking for between 42 lb/min and 51 lb/min of airflow for my build.

[jvanzyl]

I think installation is easier and should cost less? So you can attribute some of the money you'd spend on the plumbing etc to the higher cost of the Rotrex...

[J03]

Do they do any supercharger larger? Looking for between 42 lb/min and 51 lb/min of airflow for my build.

C38 series   

[m1tch]

I think installation is easier and should cost less? So you can attribute some of the money you'd spend on the plumbing etc to the higher cost of the Rotrex...

Its why I am still looking at a Rotrex as I believe it bolts up to the idler pulley meaning its a case of running pipework to a charge cooler and not needing to worry about a different downpipe etc.

[m1tch]

Do they do any supercharger larger? Looking for between 42 lb/min and 51 lb/min of airflow for my build.

C38 series   

Hmm looks like a C38-71 might do it

[1979scotte]

Do they do any supercharger larger? Looking for between 42 lb/min and 51 lb/min of airflow for my build.

C38 series   

Hmm looks like a C38-71 might do it

They don't recommend c38 for such small capacity engines.

[m1tch]

Do they do any supercharger larger? Looking for between 42 lb/min and 51 lb/min of airflow for my build.

C38 series   

Hmm looks like a C38-71 might do it

They don't recommend c38 for such small capacity engines.

Looks like the Honda S2000 kit uses a C38-81 although that is a larger engine - might be good for those who are bored out to 82mm on the 1zz, but it seems that the supercharger route is good for those going for between 3-400 whereas I don't want to be stressing the turbo out too much at 400.