Alot of late nights work on the car

[99gtt]

Finished at 3.30 am this morning . My new turbo ,manifold, wastegate ,frount mount intercooler, 3inch dump pipe mated to the existing blitz cat back exhaust and custom intercooler plumbing. Will post some more pics later[/url]

[strx7]

whats the specs on that turbo?

[99gtt]

Its a to4e .7 ar was twin scroll but mated up a single entryexhaust housing.

[strx7]

thats half of the info, its a T04E compressor wheel and the compressor housing is most likely the 0.70A/R
what trim is the turbine wheel and what A/R is it?

[99gtt]

82.5 compressor and 76 turbine

[strx7]

76mm would be the inducer on the exhuast wheel, most likely has a 68mm exducer which makes it a P trim wheel, what A/R is the exhuast housing?

82.5 would be the exducer on the compressor wheel

[Bazda]

yes its a 0.5 a/r on the codl side with a 82.5mm exducer and a 55mm inducer. hot side is a 0.7a/r twin scroll AND SHOULD BE MATED TO A TWIN SCROLL manifold as we have had issues putting them on evos and subbys at not being able to spoool up fast enough, something like 5000rpm 10psi boost.

[99gtt]

The turbo hits 15 psi at 4600 rpm.

[Bazda]

The turbo hits 15 psi at 4600 rpm.

4600 is pretty late in a 2L as it made 15psi at 4800 on my standard 4agze.
It will drop around 500rpm-800rpm if u use the twin scroll.

[strx7]

The turbo hits 15 psi at 4600 rpm.

I love statements like this, 'tis like saying "i know how long a piece of string is"

What gear is that in and is that on the flat or up a hill or what?

The reason i'm asking all the questions is it seems like a rather large exhuast side for a 2L 4cyl. It'd be more at home on a 6 cylinder. It'd definitly make use of a long runner, equal length type manifold to get the best results.

[Bazda]

The turbo hits 15 psi at 4600 rpm.

I love statements like this, 'tis like saying "i know how long a piece of string is"

What gear is that in and is that on the flat or up a hill or what?

The reason i'm asking all the questions is it seems like a rather large exhuast side for a 2L 4cyl. It'd be more at home on a 6 cylinder. It'd definitly make use of a long runner, equal length type manifold to get the best results.

the 0.7a/r twin scroll is quite big but using as a split pulse makes it much more efficient. on a 4 cylinder u have cylinders 1-4 into one side of the port and 2-3 into the other side of the port on the twin scroll therefore pumping the turbo in the most efficeint order.
on a 6 cylinder it will be cylinder 1-2-3 into one side and 4-5-6 into the other.
I have 2 2 4agze 1600 engines with this turbo and both hit full boost at 4800, another guy on here is also using one with the higher compression 4agze and he hits full boost at 4600rpm.

This is a twin scroll housing just like on rx7 turbos and late model evos.

[99gtt]

I havent driven the car since the other morning, so just took it for a drive tonight . In second gear on the flat it makes 10 psi at 3400 rpm and 15 psi at 3900, but it does not start really halling ass till 4600 . I am really happy with the turbo , it is exactly what i wanted. I prefer the power at the top end,and it still comes in a lot sooner than a vtec or vvti.

[strx7]

sure you aren't confusing TWIN entry with TWIN scroll?

Series 4 rx7's run twin scroll, 1 entry larger than the other, this effectively gives 2 different A/R's for the exhuast housing. One entry has a different entry angle onto the turbine.

The exhuast housings you are showing are twin entry, they are simply divided housings. I play around with turbo's a bit, hence the questions, i aint a newb when it comes to turbo's
I was running a T04 P trim 1.15a/r divided housing with 60-1 compressore & 0.70 A/R housing on my RX7, 2nd gear at 2000rpm..... open the throttle and instant boost, gotta love secondary bridge ports

I'm about to turbo my JZN130 surf, using the turbo off my rx7 as a sizing guide. I have a 1.52 Divided exhuast housing which i might try on it as i think the 1.15a/r will be too responsive for what I want (that sounds dumb i know) But my surf is a beast, I cruise around town in 4th and 5th pulling 1200-1500rpm. And I dont want boost till 3000rpm or more in 3rd etc, I just want 150 extra HP for when I'm towing the boat, towing my race cars, push starting sprintcars and playing against unsuspecting goons on expressways, gotta love the look on peoples faces when you are toying with them at 180+kph in a SURF of all things.

[strx7]

I havent driven the car since the other morning, so just took it for a drive tonight . In second gear on the flat it makes 10 psi at 3400 rpm and 15 psi at 3900, but it does not start really halling ass till 4600 . I am really happy with the turbo , it is exactly what i wanted. I prefer the power at the top end,and it still comes in a lot sooner than a vtec or vvti.

The 4600rpm power thing will be down to either a) its current state of tune or b) the cams.

What cams are you running? I have 264's in my GT-T engine, Its not mobile enough to find out what the power delivery is like yet.

[99gtt]

The 4600rpm power thing will be down to either a) its current state of tune or b) the cams.

What cams are you running? I have 264's in my GT-T engine, Its not mobile enough to find out what the power delivery is like yet.[/

quote] I am just running stock cams but power delivery isnt much different than stock apart from a lot more punch. The stock turbo use to hit 10 psi at around 2900 rpm but still didnt pull till just on 4000 rpm .

[blitza]

I know how long a piece of string is.


on the less cheeky side of things, I thought the twin scroll turbines were more intended to be axial/radial flow and not simply 'two different sizes', I'd expect to see an impulse/reaction style turbine wheel that would accompany this style housing to be a little....'off' when used with a traditional valute where a straight out impulse wheel would be better. bugger all experience in the above statement, I always applaude those actually that try things instead of just thinking up possibilities.

[strx7]

and what EFI system are you running?

[vvega]

sure you aren't confusing TWIN entry with TWIN scroll?

Series 4 rx7's run twin scroll, 1 entry larger than the other, this effectively gives 2 different A/R's for the exhuast housing. One entry has a different entry angle onto the turbine.

The exhuast housings you are showing are twin entry, they are simply divided housings. I play around with turbo's a bit, hence the questions, i aint a newb when it comes to turbo's
I was running a T04 P trim 1.15a/r divided housing with 60-1 compressore & 0.70 A/R housing on my RX7, 2nd gear at 2000rpm..... open the throttle and instant boost, gotta love secondary bridge ports

I'm about to turbo my JZN130 surf, using the turbo off my rx7 as a sizing guide. I have a 1.52 Divided exhuast housing which i might try on it as i think the 1.15a/r will be too responsive for what I want (that sounds dumb i know) But my surf is a beast, I cruise around town in 4th and 5th pulling 1200-1500rpm. And I dont want boost till 3000rpm or more in 3rd etc, I just want 150 extra HP for when I'm towing the boat, towing my race cars, push starting sprintcars and playing against unsuspecting goons on expressways, gotta love the look on peoples faces when you are toying with them at 180+kph in a SURF of all things.

there both twin scroll
and there both pulse tuned
ANY turbo that has to differnt pots leading to the turbine is a twinscroll

twin entry is just toyota's name for it
twinscroll is garrets

they name them difeernt to get pattents on the technolagy

the differtn a/rs is how theve implmented teh same tech

[vvega]

Can you tell me about that new twin scroll turbo Garrett put out?

A twin scroll turbine housing uses dual side by side passages into the housing. When coupled with a pulse converter manifold that separates exhaust pulses as many crank degrees in the firing order as possible, a twin scroll or divided housing works to reduce lag, decrease exhaust manifold backpressure on the top end, reduce the potential for reversion, and increase fuel economy. The twin scroll is based off the same reasoning a tri-Y header uses: keep spent exhaust gases out of an adjacent cylinder drawing in fresh air. At high rpm on a turbo car, exhaust backpressure is usually significantly higher than atmospheric pressure, and often higher than intake manifold pressure as well. A divider between each of the two volutes allows the cylinders to expel the exhaust gases without it interfering with the fresh air for combustion. Since there are two openings, each a smaller overall volume than a single scroll design, the exhaust velocity of each pulse can be maintained. This also spins the impeller more easily because lag is a function of the scroll area. A single turbine housing opening isn't as efficient since cylinders on the exhaust stroke of the 4 stroke cycle contaminate the cylinders that are on overlap with exhaust gas. A conventional turbine housing is not as effective in using exhaust pulse energy to help spin the turbine up to speed as it does not exploit the energy contained in the pulses as well.

taken from the garret website

[Silent Knight]

The Angry Old Mans is BACK IN TEH HIZZZYYYYY!!!!!