Greddy Upgrade (theoretically speaking)
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Joined: Oct 2007
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From: Annapolis MD
Joey, I am sure it's something small, just make sure everything looks tight. During my research many people talk about the bolts connecting to the turbo, make sure they are good and tight. Good luck on friday! Hopefuly by then I should have some info on the GT30 upgrade.
Joined: Apr 2002
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From: Gold Coast
Originally Posted by devs2k,Jul 30 2008, 12:32 AM
i thought it was already known the t618z would fit the manifold?
anyway, greddy confirmed this for me about 2 months ago.. casually he said it should be good for 340-350whp on the same boost as the t518z
however, it will boost a tad later than the t518z
anyway, greddy confirmed this for me about 2 months ago.. casually he said it should be good for 340-350whp on the same boost as the t518z
however, it will boost a tad later than the t518z
I did not know that Greddy has confirmed this aldready. That's good if they did. They make different turbo specs for different cars. Could you ask Greddy then whether they make any T618Z turbo that will bolt straight onto your s2k dump pipe as well?
My T618Z is rated at 350hp each. The turbo efficiency range has been rated around 1.5-1.7 bar. From my experience in the skyline, I lost a bit of low rpm response and gained a lot more mid-top end. Out of the 2 I prefer the T618Z. If you use the s2k for tight motorkhana course, the T518z might still be a better option.
It would still be good to see a T618Z on the existing greddy s2k kit for comparision though.
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From: Gold Coast
Originally Posted by Revenge,Jul 30 2008, 11:19 AM
During my research many people talk about the bolts connecting to the turbo, make sure they are good and tight.
The Greddy stainless studs that came with my turbo were all stretched after 2-3 track days.
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From: Clifton, NJ
Originally Posted by honda9krpm,Jul 29 2008, 09:56 PM
Could you ask Greddy then whether they make any T618Z turbo that will bolt straight onto your s2k dump pipe as well?
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From: Phillips Ranch 909!
Originally Posted by Revenge,Jul 29 2008, 05:49 PM
Joey, I am sure it's something small, just make sure everything looks tight. During my research many people talk about the bolts connecting to the turbo, make sure they are good and tight. Good luck on friday! Hopefuly by then I should have some info on the GT30 upgrade.
Joined: Feb 2008
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From: USA
Originally Posted by lucky77,Jul 23 2008, 05:24 AM
Ive got a Veilside Ti exhaust and test pipe.
I'll try my best to explain but im no engineer/tuner so i hope it makes sense and apologies to those that are more knowledgable.
It would come on boost as per usual and the power curve would rise fast but then as you passed about 6500rpm the power would fall of very quickly and make less than a stock kit. Vtec was engaging and all things were checked. It wouldnt follow the natural dyno power line. If we ran at lower boost the power line on the dyno would mimick the normal standard Greddy plot as most have on this forum but be down on power due to the drop in compression. It just seemed to me as if the turbo couldnt not cope with amount of pressure it was being asked to flow. I didnt bother getting a dyno printout as didnt seem worth it, but Mase was there doing my mapping and he saw the results himself. I actually drove it like this for a while as below 6500 revs it did pull very hard but short shifting the S is not the point, was like driving a diesel.
As i said this was just my experience and maybe i had a duff go but thats how i found it.
I'll try my best to explain but im no engineer/tuner so i hope it makes sense and apologies to those that are more knowledgable.
It would come on boost as per usual and the power curve would rise fast but then as you passed about 6500rpm the power would fall of very quickly and make less than a stock kit. Vtec was engaging and all things were checked. It wouldnt follow the natural dyno power line. If we ran at lower boost the power line on the dyno would mimick the normal standard Greddy plot as most have on this forum but be down on power due to the drop in compression. It just seemed to me as if the turbo couldnt not cope with amount of pressure it was being asked to flow. I didnt bother getting a dyno printout as didnt seem worth it, but Mase was there doing my mapping and he saw the results himself. I actually drove it like this for a while as below 6500 revs it did pull very hard but short shifting the S is not the point, was like driving a diesel.
As i said this was just my experience and maybe i had a duff go but thats how i found it.
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From: orange county
hi, I'm new here but i have some info on the GReddy turbo kit. I do a lot of the work on the CWest/BC s2000 and since GReddy sponsors us we have been testing some of the new turbos and as i can't give numbers at this time i will say a T618Z is in the worksand works great. unfortunately, we tested the engine on a 2.47 liter engine. I can say this though, the T618Z we had required manifold modification and turbine house mods but i think that was only cause we were the test dummies. we did go external wastegate later but that was by choice not by lack of performance fro the internal.However, we just finished dynoing another new turbo they gave us that bolted right on but needed intake, intercooler and oil adapter mod but we are testing it with an internal wastegate first. very minor mods but it bolted right on. i'll say this, very modified 20g parts and crazy power without sacrifice on the bottom and mid range in comparison to the original turbo. there will be more in a magazine feature soon but it's the best bolt on power with a GReddy turbo kit yet. wish i could say more. sorry.
gary c
design craft fabrication
gary c
design craft fabrication
