Gary's Track Day/Fast Road Weekend Car 1zz Turbo.. Now Built 2zz Turbo with E153

[Gaz2405]

How much power do you want in an Mr2?
My V6 was putting down at least 250 whp and torque and was frankly dangerous in the wet. More power doesn't always make a car more fun.

Goal is 450-500bhp, it's essentially a track day only car.

Whilst I am looking for a fun drive, (which it already is) I also want it to be terrifyingly fast for an MR2.

[1979scotte]

Goal is 450-500bhp, it's essentially a track day only car.

Whilst I am looking for a fun drive, (which it already is) I also want it to be terrifyingly fast for an MR2.

It probably won't make such bonkers torque as low down as my rotrex V6 did bit god knows what it will be like when it comes on boost. It sounds scary. Can I have a ride when it's finished 😆

Thinking about it I think Matts track car made around 400 and I believe that was considered terrifying on the road.

[shnazzle]

I've seen people come back from rides in Chris's old built v6, they were white as a ghost and visibly glad to be alive.
That was "only" about 350?

400+ is just silly

[1979scotte]

I've seen people come back from rides in Chris's old built v6, they were white as a ghost and visibly glad to be alive.
That was "only" about 350?

400+ is just silly

One of the best handling 2s ever. Can't say it scared me. Perhaps a skilled driver helped there.

[Gaz2405]

A successful couple of hours mapping under 4k rpm.

It behaved so well I treated it to a wash.

[Gaz2405]

Bit more of an update, were upto 6k mapping now and I've started to bring the big cam into play now.

I've got crossover set at 5200 at the moment and you can hear the distinctive "lift" exhaust note still when comes on.

I'm still playing the cam timing on it at the moment as it's seems to "struggle" through the rev range.

It's a strange one, the engine note changes but it's a not as responsive as I'd like.

You can can the head flows better on a 2zz than a 1zz, I'm struggling with boost creep quite badly, even with the 6psi Spring on the wastegate.

So I'm going to drop the turbo and port the hell out of the internal waste gate.

Other than that I've had to replace the aux belt as I mine had started squealing.

Decided to go the easy route and ordered to smaller belt to delete the ac as well.

[Alex Knight]

I've had boost creep issues in the past with an ST205. Was solved by adding a resonator to the exhaust.

[Gaz2405]

So managed 3-4 hours on the car tonight.

1st off drop the now redundant Ac compressor, this would've been a doddle.....if I didn't have oil cooler lines running right where you need to drop it out.

After some faffing about it was out.

Other than weight the other reason for doing this was I had a small intermittent water leak which I suspected was coming from the thermostat housing.

Sure enough a tiny weep coming from the stat housing.

I'll sort that when I've next got some time during the day.


Then onto porting the wastegate.

I decided to do it by removing the hot side and the manifold as one piece, by removing the v band style clamp holding the hot side onto the char.

Once the manifold bolts where undone, it came apart relatively easy.

Onto the bench and I started porting away, I managed to increase the waste gate size by just over a 3rd I would say so looking forward to testing it out.

9pm and we're all back together and time for a little test start and we're all good.


Phew!

A good night's work!

[Gaz2405]

So first test drive since the works...

Boost now holds where it's meant to.

I've got lift coming in at 4600rpm, and it pulls all the way to 8200 like it's meant to.

Although I'll be shifting earlier on track.

Even at 6psi I'd say this is close to what my 1zz was doing at 14psi.

Going to send the next couple of hours doing a pulls and checking the data.

Car is currently only seeing 13 degrees of timing at high rpm and from what I've read and seen I should have around 4-5 degrees to play with.


Next up is to fit the boost controller, and get it turned up.

[Topdownman]

Is that an MR2Ben rear spoiler?

What do you think of it?

[Gaz2405]

Is that an MR2Ben rear spoiler?

What do you think of it?

Yes it is, quality is ok, would need quite a bit of prep for some proper paint work rather than my matte black rattle can effort.

It does however make getting the rear lights off a pain as it's very tight.

[Topdownman]

I take it that its just fibreglass rather than plastic?

All the bumper mounted ones seem to cause that problem but there arent many options still available sadly.

If you get the chance, it would be great to see some close up shots of how it sits at some point.

[Call the midlife!]

I take it that its just fibreglass rather than plastic?

All the bumper mounted ones seem to cause that problem but there arent many options still available sadly.

If you get the chance, it would be great to see some close up shots of how it sits at some point.

CL performance do a ducktail but, you know, Russia...

[Joesson]

Is that an MR2Ben rear spoiler?

What do you think of it?

Simon, I "liked " your post complimenting the spoiler, because I thought you were jesting about the raised engine lid. But then later posts about plastic or fibre glass and rattle cans made me think there must be a real spoiler. Found it on post #468!

[Gaz2405]

So little update, I've been out mapping quite a bit and although lift is audible and comes in it still feels like it's lacking something.

I'm currently mapping it using 2 VE tables and target AFR tables.

The tables switch when lift is activated.

From various discussions and threads online it seems 2zz turbo prefer lift at around 5600rpm.

So for now I've gone back to basics, I'm currently mapping the car on wastegate pressure.

1st off mapping with loft turned off and mapping the small cam all the way to 7k.

I'll then map with a very early lift engagement at around 4600rpm on table set no.2.

I'll then change the lift to come in at 5600rpm with the tables changing at the lift point.

The lift point from what I can find online does Dip slightly and requires careful mapping to make sure it does bog from running rich at the point of crossover.

So far though butt Dyno on just the small cam seems inline of not quicker than the old 1zz turbo, you can tell the difference in low down torque though compared.

[Nvy]

So little update, I've been out mapping quite a bit and although lift is audible and comes in it still feels like it's lacking something.

I'm currently mapping it using 2 VE tables and target AFR tables.

The tables switch when lift is activated.

From various discussions and threads online it seems 2zz turbo prefer lift at around 5600rpm.

So for now I've gone back to basics, I'm currently mapping the car on wastegate pressure.

1st off mapping with loft turned off and mapping the small cam all the way to 7k.

I'll then map with a very early lift engagement at around 4600rpm on table set no.2.

I'll then change the lift to come in at 5600rpm with the tables changing at the lift point.

The lift point from what I can find online does Dip slightly and requires careful mapping to make sure it does bog from running rich at the point of crossover.

So far though butt Dyno on just the small cam seems inline of not quicker than the old 1zz turbo, you can tell the difference in low down torque though compared.

Isnt it like this?

Tune small cam
Tune big cam
Change lift where these cross

[Gaz2405]

Isnt it like this?

Tune small cam
Tune big cam
Change lift where these cross

Some do it that way, but the tens to not like cross over at the exact point where they cross from what I've read, either a couple of hundred before of after.

I'll go by feel to what seems right before putting in a Dyno and checking.

[Gaz2405]

Couple of hours on the road yesterday.

Small cam tuned and I would say is on a par with the old 1zz turbo.

Big cam, needs lots of fuel pulling out, it's halfway there but still feels like it's holding back until around 7k then comes alive.

I first thought my turbo was too small, but it wouldn't come alive at 7k if it was.

So I'm going to get some more time on it. Check all the usual culprits, OCV, lift bolts etc

Getting there though.

[Gaz2405]

Excellent evening mapping!

I've set the change of cam to come in at 5650.

This seems to be the spot where it is as seamless as it can be and also leaves me in lift when I shift at 8k, even with the std FL 6 speed box.

Managed to get my series 2 Elise rear diffuser fitted over the weekend too.

Next step is to hire a Dyno for the day and have a see what power we're making.

Currently peaking at 12psi 🤣.

[Gaz2405]

A few pictures from today's drive

[Gaz2405]

So the lift has never quite worked the way I think it should and the car seems to perform better just on the small cam.

Lift does come on as you can tell from the change in exhaust note, but its seems to struggle and there is a defined drop in power (which can also be seen by using the virtual dyno setting in the ECU)

I've changed the lift bolts (they were fine anyway), cleaned the oil screen (also fine) and the solenoid was also working, as you can invert the power on it on idle and the car stalls, I've also tested its functionality via the ecu with the engine off.

So looking over various 2zz lift threads it seems I may have an exhaust restriction as they can be very susceptible to  breathing changes. It can't be on the inlet side as its forced induction, so I'm pinning my hopes on the exhaust.


I've fabbed up a quick 3" system with a single resonator to see if that works before getting a new system built.


So fingers crossed, I'll get out for test this weekend so see if its helped.

[thetyrant]

Sounds odd, is your exhaust 2.5" turbo back at the moment ?    i know on the n/a 2zz exhaust can make a big difference especially the manifold but if your 2.5" turbo back without any neckdowns i dont think it should hold back till north of 300hp, ive ran 350hp with a 2.5" on Evo2 and only went 3" when moving upto next level.

Hopefully the large exhaust helps though as would be an easy fix, i suspect its something in the mapping though as expect there is quite a few tricks to mapping the low/high lift etc to get it working well and maybe have to bite the bullet try find a experienced 2zz forced induction mapper to go over it.

[Gaz2405]

Yeah I'm hoping it's just a blocked cat on the old system (2.5"). It's the cheap Malian sports cat.

Going 3" will at least rule that out if it's not.

Then if not like you say into get mapped properly.

But fuel,timing and Vvti are all in line with were they should be.

[thetyrant]

Well i would not be surprised if that cat was choking it up quality seems very hit and miss, hopefully its that

I found this thread if you havent seen it already sound like guy had similar issues - https://www.spyderchat.com/threads/turbo-2zz-problem-coming-on-lift-ecumaster.156875/

[Gaz2405]

Well i would not be surprised if that cat was choking it up quality seems very hit and miss, hopefully its that

I found this thread if you havent seen it already sound like guy had similar issues - https://www.spyderchat.com/threads/turbo-2zz-problem-coming-on-lift-ecumaster.156875/

Yeah that's me at the end of it asking how he sorted it 😂

Mine was no where near bad as his was though. I can at least pull through lift.