Reducing Lag - GA70

[love ke70]

ebay for a fmic,and yes it does have TVIS

[JustCallMeOrlando]

Mic, I'd thought one of the wastegates might have been stuck open, but so far, I can't go and play with the car... Too wet outside! Also, the turbos were in pretty good nick from the inspection a mate and I gave them before buying, and they went on the car the very next day. Will check waste gates soon.

JCMO: The R33 also has the advantage of a larger engine... So it's not fair to compare them.
As for exhaust side of things: It has a pretty damn "free flowing" exhaust (Basically, cat, and a rear cannon, all 3" from the dump)
I actually want to change it slightly, as the larger pipe size, gives a higher up power band (From what I've seen) but have to go get things checked out first.
I'm trying to find a FMIC, but also one that's fairly "cheap" (Don't want to spend the earth on a daily, just give it some more kick)

Eldaro: TVIS - I have no idea either

I got compressed air and pulsed the wastegates with some Inox, that was a simple way to tell if they were jammed.

It does have a larger engine, but a lot of it is down to turbo, the R33 turbo would probably be as responsive as your factory turbos, if not slightly more.

Didn't realise you had a free-flowing exhaust. Get one of the Justjap ones, they go for under $200. Knock up some mild steel IC piping and you're away.

Yes, it has TVIS, check all the vacuum lines are on it properly.

I'd say your best improvements would come from fixing the timing, and a good EBC.

[SIKTOY]

1GGTE + no lag = HA HA HA HA HA HA
All the 1g's that I have driven have a shit load of lag you could try the twin dump pipe kit that linden makes

Ben

[Kyosho]

1GGTE + no lag = HA HA HA HA HA HA
All the 1g's that I have driven have a shit load of lag you could try the twin dump pipe kit that linden makes

Ben

Wasn't saying no lag.
I said REDUCING it.

I can't get any form of power until 4500 - 5000RPM.
For a stock motor, I find this unacceptable.

[love ke70]

ben, you need a drive of mine

[The Real Roadrunner]

have you set the static timing where it supposed to be as retarded timing=retarded driving.

[Kyosho]

have you set the static timing where it supposed to be as retarded timing=retarded driving.

About to see if I can get into a mates workshop so I can set the timing.
I can't park in my garage at the moment...
Will test wastegates whilst I'm there.

[SIKTOY]

ben, you need a drive of mine

If your offering Im driving

[love ke70]

give me a spare 1g and ill let you drive it.
i need cams, mine are fucked, and just a head to build up for real power.

but yeah, with the 6boost mani and good rb20 turbo it hits full boost under 3K in second with a 4.1 ratio

and theres not really a hole below that, off boost will keep up with my sisters 95 323 astina easily

[mic*]

I was suggesting the boost gauge at the compressor outlet of each turbo to get a rough idea of whether they are contributing equally.

Any real obvious difference would suggest either a wastegate or shaft prob with the poorer turbo. Either would cause your lag.

Equal readings upon testing would suggest the prob is elsewhere - timing, plugs, rings, etc...

[brett_celicacoupe]

yes 1Gs are very laggy.

after driving other cars, 1jz etc i just cant believe how laggy it is.

off the line my car is slow as. there is no in between, your either revving it so hard it smokes the tyres or, you ease off the clutch and bog down to 1500rpm.

my tips for getting the turbos into life earlier:
-open up exhaust as much you can until its too loud. i gutted my cat, running no mufflers now
-get a boost controller of some type. i found even with the turbotech (spring + BB type) set at stock boost, there was less wastegate creep and it did spool slightly quicker.
-find a higher ratio diff. the car is heavy enough to load the car up so you can afford increase the ratio.

i actually got a lower ratio diff as the RA40 is pretty light. the 4.1 diff wouldnt get much boost in first. now with the 3.9 diff i get 15psi in first

[TheToyman75]

Kyosho,

Sounds to me like your 1G is perfectly normal.

DO NOT put a smaller exhaust on it, it will only restrict exhaust flow and reduce your performance.

The GA70 is a heavy car it takes some power to get it off the line. A stock 1G is never going to inspire you behind the wheel.

You need to realise you have all of 2 litres turning 2 turbo's. Think of it as 2 single turbo 1 litre engines and its actually quite good for what it is. If you want to get it on the hum sooner you need to improve on the factory package, more boost won't noticably improve boost responce, just what happens once you come onto boost. A set of the twin dumps from Linden at Road runner will improve boost responce as the stock dump pipe is crap.

Alternatly go the single turbo option, then you have 2 litres turning just the one turbo and if you get something small it will come on much harder and sooner. I'd Suggest somthing like a mid sized GT28 if you want response over big power.

[Kyosho]

Toyman.
I've reset the timing now, and I've found the lil ol' engine is springing to life alot sooner (Wants to start really moving along now at 3000-3500RPM.
So there was a MASSIVE increase from 5 - 10 degrees of base timing.

It's still quite "slow" but I think it's nearly at the "normal" slow point now, that if I just punch it off the mark, it lumbers along. I'm thinking that the only way to over come this is a nice stall convertor.
I don't want to go changing turbos, about as far as I want to go is to get the car a bit quieter, (Although not a performance mod)
Wack a FMIC, boost controller, and stall convertor in.
As I said, it's a daily, I just need to be able to get moving off the mark a bit quicker, so I think the stally will dramatically improve this.

From memory, the old owner said he put it over the weigh bridge at 1700KG including driver and sound gear. So they are a heavy little unit.
And I also found the turbo setup a touch stupid if you ask me.
Twin turbos, on a 2L, only being fed by half the motor to each. I wouldn't have done it that way personally, but I'm guessing Toyota had a reason.

I'm alot happier with it since I changed a couple of cracked hoses (Going down to the power steering pump I think?)

Also, TVIS, where can I locate it on my engine to check it out to make sure it's working.
I also need to find the bleed nipple on the cooling system (On the heater mainly!)
The motor etc is bled from everything I can find, but the heater still won't work, and I can hear "water" inside, which I think is water running around in empty heater pipes!

Also, are the injectors generally audible at say cruising at 60km/h in second gear (Just enough throttle to hold speed?)
If I back off, the noise disappears (Fuel cut)
Give it a booting and I can't hear it over the exhaust note and the induction whistle.

[Pube]

It's still quite "slow" but I think it's nearly at the "normal" slow point now, that if I just punch it off the mark, it lumbers along.

Try not being so heavy footed off the mark. Half throttle it, let it come on boost and then give it to it. Even when I try and spool up my xr6 turbo at the lights even to the point of wheel spin, it still 'feels' slow (it just probably is ) when the light goes green and you launch as compared to when you half throttle it till it comes on boost, then nail it.

[love ke70]

Toyman.
I've reset the timing now, and I've found the lil ol' engine is springing to life alot sooner (Wants to start really moving along now at 3000-3500RPM.
So there was a MASSIVE increase from 5 - 10 degrees of base timing.

And I also found the turbo setup a touch stupid if you ask me.
Twin turbos, on a 2L, only being fed by half the motor to each. I wouldn't have done it that way personally, but I'm guessing Toyota had a reason.


Also, TVIS, where can I locate it on my engine to check it out to make sure it's working.
I also need to find the bleed nipple on the cooling system (On the heater mainly!)
The motor etc is bled from everything I can find, but the heater still won't work, and I can hear "water" inside, which I think is water running around in empty heater pipes!

.

good to hear the timing is right now, i thought it would make a difference

im quite sure toyota had no idea what they were doing when designing the turbos for most of their cars and just decided 2 must be better than one. CT12's really are shit turbos, really really really, and then their manifold design is worse lol

TVIS is against the head, where the intake manifold bolts to, its 25mm or so thick, got butterflies, does cool things with low down power...or so they say...

cheers, andrew