Need advices! Tomei 2.8kit with stock turbo + aquamist tune

[leung23c]

Hi! My situation is that I have a tomei 2.8 kit with a 1.1mm head gasket so I think compression ratio is slightly higher than stock now...I have a innovate wideband and a power fc and once I get everything hooked up I will install aquamist and inject meth/water 50:50 anywhere above boost and use the fc to play with timing and lean out as much as possible. This is the big plan. What do you pros gotta say?

[gtrte37]

stock turbo??

[gtrjon]

its irrellevant you have a $25000 motor with $200 turbos? you wont make over 400whp.

[leung23c]

That's fine I want it to burn as little fuel as possible with maximum efficiency. This way I get 320~400 hp with $1000 spending. Once I tune it right I will put a bigger twin turbo to it. I am thinking Tomei 7655 or HKS GT-SS. My motor doesn't even have a breather tank or oil baffle whatsoever. It just has a stroker kit and brand new oem internals....(new oem water pump, oil pump, timing belt tensioner etc). Oh yeah stock camshaft too.

I got the car for $15000 but the previous owner spent $20000 to put that stroker kit it. I want to enjoy my car first lol before ripping it apart. Aquamist seems to be the way to go.

[Skym]

Stock cams = best for fuel economy. With aftermarket cams you run engine richer, raise idle rpm.

If want max efficiency, you open exhaust up from turbo's, as can produce same hp at lower boost level.

Leaning engine out alot = knock, engine failure. More hp comes from running engine rich, but not too rich and adjusting ignition timing.

AEM water / meth kit works on GTR's -

http://www.aemelectronics.com/water-methanol-injection-kits-23/

Can be up to 54hp gain at same boost level (RB26 with Type B Tomei Poncams, 2860 Garrett turbo's, etc).

[leung23c]

Thanks for the info! This is my planned mapping....

Idle - 14.7 ~ 15.5
Light load 1000~3000rpm -14.0~14.7 (should be no boost, simulating crusing condition)
Loaded 2000~8000rpm - 12.8~13.5 with 50/50 meth water injected, amount is 20% of the fuel flow.

When I say lean out I mean go from 11.0 to 13.0 region.

They claim water injection can boost octane value by 20 points...
This is my first time doing it but if it does what it says I can have both ends of the world.

[bourquetc]

You dont buy a gtr/skyline for fuel efficiency!

[leung23c]

I am not made of money......

[h4X6]

Help me try to understand this.... You want to spend 15000+ on the engine doing all that then now you want fuel efficiency? My suggestion... Sell the skyline and get a hybrid

Skylines and fuel saving cannot be used in the same sentence. Sorry to say but it not


Sent from my A510 using Tapatalk 2

[gtrte37]

The things I would do for a 2.8 stroker...seems like to me you should sell it, make a ton of money back and buy a stock rb and go from there. Someone out there will put this to good use.

[Dragon Humper]

D Jetro or L Jetro Power FC?

The L Jetro is better suited to fuel efficency, like the factory computer it uses the low compression of the motor to its fullest advantage and runs the motor somewhat like a diesel. It doesn't care if you are in boost (it can't tell) it only fuels enough to meet airflow. Trust me, with a stroker and stock turbos, you will be in boost a lot. Even at light cruise on the highway the turbos will be spooled up, they are too small they can't help it.

You can make an assload more power with the D Jetro but it knows when you are at zero vacuum and tipping into boost and will up the fuel usage even though you try and lean it out. I've tried, you have to go scary lean on the map to see the result you want under real world conditions and I don't trust that. Result, crap gas mileage. I do OK with a DJetro, about 25mpg on the highway and 20 or so around town if I behave, but that's it, not not bad for a car that makes my power, crap for a car with a little 2.6L motor.


Jon.

[cortexx]

It just has a stroker kit and brand new oem internals

thats an oxymoron if ever i heard one .

and running leaner than 11.5 under full boost to 8000rpm will create very hot turbos , one of the reasons you run rich at high loads is so you don't turn your turbos into a pair of white hot mini suns under the hood . I learnt that the hardway on a 6G72 engine

[leung23c]

D Jetro or L Jetro Power FC?

The L Jetro is better suited to fuel efficency, like the factory computer it uses the low compression of the motor to its fullest advantage and runs the motor somewhat like a diesel. It doesn't care if you are in boost (it can't tell) it only fuels enough to meet airflow. Trust me, with a stroker and stock turbos, you will be in boost a lot. Even at light cruise on the highway the turbos will be spooled up, they are too small they can't help it.

You can make an assload more power with the D Jetro but it knows when you are at zero vacuum and tipping into boost and will up the fuel usage even though you try and lean it out. I've tried, you have to go scary lean on the map to see the result you want under real world conditions and I don't trust that. Result, crap gas mileage. I do OK with a DJetro, about 25mpg on the highway and 20 or so around town if I behave, but that's it, not not bad for a car that makes my power, crap for a car with a little 2.6L motor.


Jon.

I know it uses close-loop to operate that's why I will put the aquamist to kill EGT and detonation to make sure it will be safe. I am thinking if it can be tuned so it can inject just bit of water during cruise. My car use factory AFM, and no I have no plan to use MAP lol not ready for it.

May I ask what do you mean exactly by running the engine like a diesel?

thats an oxymoron if ever i heard one .

and running leaner than 11.5 under full boost to 8000rpm will create very hot turbos , one of the reasons you run rich at high loads is so you don't turn your turbos into a pair of white hot mini suns under the hood . I learnt that the hardway on a 6G72 engine

Thanks for the info lol. Again, my plan is to take full advantage of water-injection here to kill EGT and detonation. The aquamist is pretty smart it got some kind of sensor attached to a fuel injector to track fuel flow and can be programmed to inject meth/water at exact ratio to the fuel. It got an optional MAP sensor so it KNOWS when to inject meth/water above certain thresold. Methanol itself is already a fuel and injecting it already making the mixture richer.

But I really appreciate first hand experience with water-injection tuning from any of you guys cuz this is just theory and I haven't done any of it yet.

[leung23c]

Help me try to understand this.... You want to spend 15000+ on the engine doing all that then now you want fuel efficiency? My suggestion... Sell the skyline and get a hybrid

Skylines and fuel saving cannot be used in the same sentence. Sorry to say but it not

Sent from my A510 using Tapatalk 2

OK I got the car the way it is. It ALREADY has a stroker kit on it. I am trying to find what is the most cost-effective way to go from here.

I buy this car because I LOVE skyline and I love the handling and the technology and high-quality product. I am not necessarily saying I need to save fuel. I am saying I must do everything the most cost-effective way. Do you know 11.0:1 A/F means you are injecting 50% of EXTRA fuel according to the air you match, which go wasted and vented to the atmosphere!? More effective mean going longer distance on one tank, which is also very important in racing. Yes I know I can spend 10G in parts to snap a T78 on it and make it a monster but I don't want to do that, yet. And yeah because I love my car I won't ever sell it for money. Sound childish but that's what I think right now.

[NismoS-tune]

I am not made of money......

I wasnt on a budget and I couldn't justify a $12k stroker kit, then again I had support mods.

Waste of money that stroker kit without lots of fun mods... Nice buy anyway.

Honestly, sell that stroker and get a good rebuild stock engine. Still good for 500whp without the expensive price tag. Probably spend the cash elsewhere like turbos