corners2

How many pounds of boost can the T518Z-10cm handle? (Not just pump fuel but the max of the turbo itself?)

What is the size of this turbo equivalent to? GT28RS?

Can you run anything larger than 550cc injectors on the ultimate? If so what would be the largest size?

Could you order the kit with one of their slightly larger turbos?

I have read through every thread on this kit so please don

Enthralled

if the kit can get to 350whp fairly easily, i'd consider trading in my Vortech.

Envied

I honestly don't see why they couldn't. I mean, they are pretty much a 18G turbo. A lot of Subby guys are running 18G's now. The whole Greddy kit is fairly new. You don't see a lot of guys trying to mod them if they do have the kit. I don't see why you couldnt turn the boost up to 12-15psi really, the 18G's are good for like 25psi... The thing with turning up the boost is most people that buy a Greddy kit bought it cause it will work with everything else on the car being stock. So turning up the boost will require better clutch and new HG to lower CR. Another weird thing about the kit is it doesn't use a BOV. I mean hell my 89 supra turbo was only running 6.8psi and it had am OEM recirculating BOV. I have been pricing FI kits and it seems that no matter what route you go, you will end up spending the same amount of money to achieve the same power goals. For instance, a non-aftercooled Comptech new with a FMIC kit or a aftercooled Comptech new will run you about 5600. Upgraded injectors, engine management and pulley will run you anywhere between 1100-2000. An inline pro kit will run you like 7k with all their bells and whistles.

camuman

u dont need a 3mm hg for 350 whp. but you will need tuning. can that turbo flow enough uptop or will it be like a ko3 sport vw turbo, where you make full boost early and then it tapers off

S2Kart

I've been trying some stuff on my Greddy kit and here is some info.
1. I put on a Berk high-flow cat - WOW what an improvement vs. the OEM. The wastegate can handle the extra flow, no boost spikes even at 10psi setting using an AEM boost controller. Also, the 18Z is 10cm2 and I think an 18G is 8cm2.
2. People are using larger injectors with the Emanage ULT now. Go to the JDM tuning forum for the latest info.
3. Getting an unlocked base map is easy. So far I've added 1.5 degrees of timing, and after an EGT install I will be trimming fuel as its too rich up top for my liking.
4. I don't have an 18Z compressor map but I do have the 18G. The compressor and turbine are on the small side, but there is lots of boost from 3900rpm and up. The 18G makes enough flow at higher boost to keep up with the 2.0l @ 9K rpms, but the charge temp will be higher. Keep in mind that flow rate is a function of pressure ratio (pressure into the turbo vs. what comes out) and flow is what matters most. The boost psi is just an indicator of flow. Another way to look at is to consider something like a rex on high boost. The effective compression ratio would be off the chart untunable if the combustion chamber actually received the pressure that the boost psi suggested.
Back to reality: If you want to use a small turbo at higher boost you'll want to cool down the charge, since the little turbo's adiabatic effieciency up top goes kaput. I'm putting on 100psi water/meth injection for $170, then tune. I'm hoping for ~350 to the wheels on a dynapack. The 550 injectors should handle it since the meth will richen up the charge. At that point I'll be into it for $4300 and will call it good. Once I'm done I will post dyno plots.

Envied

Good info, keep us posted. If I could find a Greddy kit under 4k I would prolly go that route. Are you using a BOV?

Casas

Check with Eric @ Vivid, great customer service and the price you are looking for.

I am excited about the kit, however there seem to be mixed results as far as power. I know part of it is b/c of the tune, but i have seen some numbers i wil be happy with and others that would make my new debt not soo much fun.
-Any dynos stock VS(testpipe/exhaust/etc)?


-Matt

honda9krpm

the 10cm^2 is 25G
I think Greddy states that they are good for around 15-16psi each.

sharkethic

Inline pro does not cost $7k, you can get evreything installed and tuned for under $5k.

Kaos_theory

not if you go big turbo....you have to figure in clutch, HG, injectors, EMS.....etc