1G-GTE turbo comparisons, best options for HP aims

[love ke70]

hypo, if I find myself with 6 spare hours, I will try search the old forum

I am assuming you did away with the TVIS between the intake manifold and the head? I have done some reading that suggests that it wont hurt HP, only uneven flow, so I am tempted to try and keep it to assist bottom end. any thoughts on this?

Why such a difference in the length of your power runs from the two dynos? the SAS one makes it look as though it is really peaky, but the blacktrack one looks alot better for time on power, did they just pull the foot early on the SAS run?

Its a shame that is not plotted in RPM, can you give rough RPM figures for the important points on the map please?

how many kms and how much hard work has this seen since doing the oil mods and holding together?

Cheers for the great info

[oldeskewltoy]

Are you planning on doing headwork??

From memory the 1GG head is not too dissimilar to a TVIS 4AG head so should respond similarly... although the tight pairing of exhaust ports might minimize some of the potential gains.

Anyone have clear photos showing inside the exhaust ports??

[1JZ-Rolla]

Different speed scales on the two dyno screens changes the apparent area under the curve, but I can see what you mean, power at 120kph road speed is vastly different. Were you running different diameter tyres on the two dynos Steve?

[love ke70]

1JZ, yeah thats what I was looking at, its on song alot sooner in the old sheet
maybe the amount of load the dyno was putting on?if you look at 300hp, one its making at ~ 300 hp at 125 kph and the other is nearly 150 kph to get 225kw ~ 300hp...

Oldskewltoy,

yeah mate, head work will come, the first motor to go in the car will be a standard motor (I have two runners here waiting)
and then I will build the good one. HKS head already has some work and larger valves. Have not looked into just how much is done to it yet.

after deciding turbo my most pressing question will be to keep the manifold opening where it is or to cut and shut it, because that will let me get all the pipework done.

[hypo23]

I can't explain it it was a while ago, from memory they were only a month or so apart, could have been when i put the new wheels on.

tvis is definitely gone its only a restriction, i just had to put shorter studs in to bolt the intake to the head.

[love ke70]

only a restriction when its shut, but does it create a restriction when open?
who did the power port on the intake for you?
what throttle body are you running? I may aswell get my mani done and sort the throttle body before doing intake pipework.

cheers

[hypo23]

Specialised powerporting in VIC somewhere is where i got mine done, google it and it will come up.

As for throttle body, from memory it was a Honda item of some description, the guy that modified it for me sorted that out at time.

As for TVIS, thats if the actuators etc still work as i assume its been sitting around unused for ever, i just found it easy to get rid of it and i know it won't cause me a problem, its just something else that can fuck up thats not really required for an engine that your doubling the horsepower of.

[love ke70]

I hear what you are saying, but you are also destroying the little bottom end these things do have, so if the TVIS is there to help it, I wonder how much it will help with drivability.

whats yours like on the street? graphs always make the bottom end look ugly, but real world can vary.

Your opinion?

[oldeskewltoy]

. HKS head already has some work and larger valves. Have not looked into just how much is done to it yet.

after deciding turbo my most pressing question will be to keep the manifold opening where it is or to cut and shut it, because that will let me get all the pipework done.

????

Do tell... would LOVE comprehensive photos and details.....


concerning the TVIS... **IF** it is the same as the 4AG system the holes in the TVIS plate are smaller then the stock port size (floor to roof height of port was greater then TVIS port diameter)... and that doesn't even account for the shafts. And if it was ported, it likely is even larger.

A proper port job on a 4A can increase airflow all by itself..... again this is a 4A... but, correct me if I'm wrong, the 1GG head is a precursor to the 4AG and so similar mods might return similar results

intake...



exhaust...

[boxh34d]

Specialised power port is in mount Helen, a 'suburb' of ballarat.
Andrew is a pretty good bloke to deal with.
Can't comment on results though as I haven't put mine back together.

Edit:
Andrew sanders, 03 5330 1123

[love ke70]

The head is what lets the 1g down from all reports, I will only do the mani to balance the flow etc.
when I said HKS head, I was referring the head that was on my HKS motor. I am 97.3% sure it has valves and a port job. I will dig it out and get photos. but you may have to be patient, im so flat out at the moment.

I will have a look at the TVIS and compare to port size etc.

as Kyle said, one of these things unopened will go 300rwkw, so with the extra capacity and all the nice bits and bobs it will walk it in. The challenge will be getting it to hold together on the track lol


Thanks for the details boxh34d, I will get in touch with him soon


Cheers, Andy

[SillyCarS]

I have a garrett 3076r with 0.63 rear housing on stock 1g, custom plenum, microtech lt12s, 15 pounds boost has me making 225rwkw on ULP98

its a great turbo, i built mine for hill climb and gymkhana type stuff, its on full boost all day long in this application

next step for me would be to pull head off, better gasket, port, cams, dial custom cam gears etc, that would get up to a reliable 250rwkw and then e85 i would expect 300rwkw

but srsly... would i spend that king of money on a 1g

NAH

edit: first thing i did weas rip out the TVIS plate, also my twin scroll rear housing isn't split

[slipway]

not turbo related but ive read the bolt pattern it the same for 1g and 1jz intake plenum's so with gutting and some port matching of the tvis plate it could be an easy solution for a front facing plenum. i think it was sparky stav that had a cnc adaptor made. if anyone has a 1j plenum around brisbane i can have a look, got a whole gze and gte, ge intake and plates in the shed

[trdee]

GTX3071R is also an option. Will flow beyond 350rwkw and should spool a bit earlier than a 3076.

best thing to do is download some compressor maps and plot your engine's expected operating range on them.... it's a bit of a tedious process but i found it to be very helpful when i was trying to decide on a turbo

[SillyCarS]

^^^ i would like to see the results of this, def one i also considered