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Old 05-17-2007, 11:00 PM   #1
Liam
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Default Another, yes... another turbo question... o_O"...

Hey all, first start... I did search and I am not really looking for a perfect answer, I want to make sure am I looking into a right direction before I waste another huge amount of money, so... please don't flame me hard

Back in a few months I went to stage 4 with a VF39 and honestly the power really not that impress to me... I was regretting not picking up the 16G at the first place... and now... I decided to go bigger

I am looking into BIG16G or 18G and I really hope to build a fun to drive daily drive car

Myself is really leading toward to the 18G because I am afraid I will regret again for getting the BIG16G and not happy with it (and waste another set of money)... but my question is... I am afraid of the Lag on 18G...

Somesay, 18G is not that lag on a 2.0 but yet, some of you found that the lag is more than you expected.

So... basically the turbo lag is the things that really holding me to not getting the 18G but the BIG16G... and if I really get the 18G, should I go for a 7cm or a 8cm? do they make any different on power or spool up time?

I've sat in my friend's EVO8 with a BIG16G turbo upgrade and the power is totally amazing, lag is not bad at all, so that's why I am thinking into the BIG16G... BUT... I understand the EVO has a totally different engine and may result in a different power output even I am using the same turbo, so... which turbo should I install in order to get the same "Happiness" as his car does?

Please guys I hope this is my last turbo upgrade and I'll never looking back THANKS! ><
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Old 05-18-2007, 12:30 AM   #2
vortectoy
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Stuck between the two? That is where im at...
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Old 05-18-2007, 12:32 AM   #3
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I just went down that path and went with an 18G with 8cm exhaust. See my thread here: http://forums.nasioc.com/forums/show....php?t=1255192

I'll be getting tuned tomorrow -- I'll post up numbers, spool times, etc... With my own tune, I'm seeing full spool (21psi) by 3600. That's with a fmic also. Really fantastic, if you ask me. And, even though it's spooling later than the stock td04, it's making way more power at all rpms.

I'll be updating that thread over the weekend. Also search around -- there's a lot of turbo info in this forum area as well as proven power bragging.
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Old 05-18-2007, 01:31 AM   #4
Liam
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Quote:
Originally Posted by rainwrx View Post
I just went down that path and went with an 18G with 8cm exhaust. See my thread here: http://forums.nasioc.com/forums/show....php?t=1255192

I'll be getting tuned tomorrow -- I'll post up numbers, spool times, etc... With my own tune, I'm seeing full spool (21psi) by 3600. That's with a fmic also. Really fantastic, if you ask me. And, even though it's spooling later than the stock td04, it's making way more power at all rpms.

I'll be updating that thread over the weekend. Also search around -- there's a lot of turbo info in this forum area as well as proven power bragging.

Sweet turbo !!
and one more question... what's the difference between a 7cm and 8cm housing 18G?... which one will spool faster in this case?
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Old 05-18-2007, 03:02 AM   #5
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7cm = quicker spool
8cm = more top end power

Based on what I have seen on these boards 7cm will get you around low 300whp, while 8cm will get you closer to 350whp (depending on tune & dyno).

BTW...Not sure what size injectors you are running now, but if you go with the 18g (heck even the Big 16g) you will want to be running at Least 650's otherwise you will be leaving power on the table.
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Old 05-18-2007, 06:55 AM   #6
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Thanks!

I'm told the 8cm will spool about 200-300rpms later than the 7cm on our 2.0L. That's about 1-2 seconds of spool time. The 8cm gives you more top end and 20-30 more ft/lbs of peak torque. I'll be seeing what this can do today.

With injectors, I went with 800cc. So far I've hit 68% injector duty cycles.
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Old 05-18-2007, 07:37 AM   #7
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The VF-39 is a fantastic turbo for the 2.0L. Upgrading to a 16g, or 18g may give you a little more power up top, but IMO for the money spent, I'd just wait, and put that towards a 2.5L bottom end, and have a crazy powerband. Sounds like you already have everything else needed for a really nice package. You will definately feel the difference then. The torque will be like nothing you'll ever be able to get out of your 2.0L.

If you do decide to change the turbo now, I'd go with the 18g, then if you decide to do the 2.5L at a later time, the turbo will be even a better match IMO. We built a 2.5L hybrid engine and put an old FP 18g, 8cm turbo on it ... 370 WTQ, 350 WHP. The car is so nasty ... peak torque by 3500 RPM.
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Old 05-18-2007, 10:51 AM   #8
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Go with a 20G. I installed mine about a week ago and I am getting full boost by 3800rpm in 3rd gear(20psi).
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Old 05-18-2007, 10:58 AM   #9
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just find somebody with an 18G or 16G or whatever and ask for a ride in the car. then youll know what to expect better than internet people telling you what to expect
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Old 05-18-2007, 01:21 PM   #10
Liam
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I wish I could sit in somebody car and feel the difference... see if I could have a chance

And I am reading about the EVO3 16G and seems that's a nice turbo too
I am not planing to make a lot of power, just around 280 - 300 whp
is the evo3 16g really give a lot faster spool up? or should I stick with 18G cuz it seems like push harder with more lag, any idea guys?...
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Old 05-18-2007, 01:29 PM   #11
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yea id say go for a 20g and save for a 2.5 shortblock and save for a tranny
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Old 05-18-2007, 01:40 PM   #12
Liam
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honestly 20G is too big for me I guess... so I will stick with 18G with 7cm
Just wonder if a Evo3 16G or a 18G will pull harder and which one is better for me
And this is the one really holding me...
Since the evo3 16g will spool a lot faster, but how?
like 2-3 sec or more?
some say on a 2.0l block is not that bad for a 18G but I live in Cali...
so will the 91 pump gas make the 18g a better choice over the Evo3 16G?

Evo3 16G or 18G... to be or not to be

Last edited by Liam; 05-18-2007 at 01:51 PM.
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Old 05-19-2007, 05:38 AM   #13
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and btw, I am not looking to built a highway monster...
just want something pull hard on touge or street
will a 18G too lag for me in this case?
since I saw EVO3 16G will just spool up around 200rpm faster, is that true?...

Thank you guys
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Old 05-19-2007, 06:06 AM   #14
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Quote:
Originally Posted by Liam View Post
and btw, I am not looking to built a highway monster...
just want something pull hard on touge or street
will a 18G too lag for me in this case?
since I saw EVO3 16G will just spool up around 200rpm faster, is that true?...

Thank you guys
Right now im on a super16g thats tuned for safety im making 265whp to the wheels the thing is laggy theres no fun making power in the 4000Rpms when i know this turbo can do it 1000rpms earlier and im missing atleast 40whp.

I say Evo3 will get you numbers will spool decently fast and you wont have to worry about a lag from 91 gas when you could problaby make much more power and have it respond better on a smaller turbo than the 18g. There was one guy in cali that sold his fp20 becuase it was laggy from 91 and the power was not there on cali gas he went back to his vf39.

/My vote Evo3

Last edited by dingobite; 05-19-2007 at 06:11 AM.
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Old 05-19-2007, 06:16 AM   #15
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Do a search in the Power bragging forums and this forum on a 18g and youll get a good figure on what numbers everyone is making. Then when it comes to 91 gas you have to think how much power youll be missing becuase your not useing the same octane most those guys are useing.
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Old 05-19-2007, 05:17 PM   #16
Liam
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Ya I totally understand the cali gas is sucks...
but I am not sure how much power I will be lose when using 91 instead of 93
will a stock TD04 spool faster than a EVO3 16G in this case?
or will a 18G be too laggy for a 2.0L using 91otc?
Honestly... the more I search the more result I got... and the more confusing I am...
so on cali gas, what's the difference between the whp of a EVO3 16g and a 18G? will there be a lot?
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Old 05-19-2007, 05:23 PM   #17
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Id assume comparing numbers seen you would not break 300whp and the torque wont be so good eighter most 18gs dont break 315whp to begin with so think of it as loosing 2owhp at most do to gas.

You could problably get 280+ to the wheels on a 16g and the torque will be noticable evo3 and the 18g are very close powerwise to begin with.
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Old 05-19-2007, 05:24 PM   #18
Liam
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Quote:
Originally Posted by dingobite View Post
Right now im on a super16g thats tuned for safety im making 265whp to the wheels the thing is laggy theres no fun making power in the 4000Rpms when i know this turbo can do it 1000rpms earlier and im missing atleast 40whp.

I say Evo3 will get you numbers will spool decently fast and you wont have to worry about a lag from 91 gas when you could problaby make much more power and have it respond better on a smaller turbo than the 18g. There was one guy in cali that sold his fp20 becuase it was laggy from 91 and the power was not there on cali gas he went back to his vf39.

/My vote Evo3
so with a tune, a evo3 16G can make more power than a 18G on 91 gas and spool much faster?
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Old 05-19-2007, 05:33 PM   #19
dingobite
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I dont know that i just kno its hard to get a 18g on a 2.0L to make some good numbers on 91 gas.

Sending you a Pm.
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Old 05-19-2007, 06:13 PM   #20
dingobite
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Pm sent....

You really need ask the tuners or even the turbo vendor what they think of 91 octane and get more than one opinion what they expect out of that turbo.
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Old 05-19-2007, 07:39 PM   #21
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dingobite is right. A lot of people running 91 cali gas have been disappointed with the 18g. They've been getting big16g numbers with their 18g. I would say go with the big16g and if it's not enough maybe go ewg or meth. Or you can go 18g with meth and take it from there. You are in a dilemma.

But like WRXDriftR said, you really need to find someone and go for a ride/drive with both turbos so you can really make a decision.
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Old 05-19-2007, 11:50 PM   #22
Liam
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Thank you so much dingobite!! those information helps a lot!!

and btw, do you guys think I will be disappointed switch from vf39 to a BIG16G? am I getting only a small HP increase?
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Old 05-20-2007, 12:06 AM   #23
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and actually are there any difference between a BIG16G, EVO3 16G and a Super 16G? Seems like the BIG16G and EVO16G is the same thing
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