thoughts about 18G

[4G63Spyder]

I have a Mitsu 18G in my 99 GST, and the spool time is somewhere between forever and 5000 rpms. When I get to full boost (+/- 17 psi right now) she runs like mad, but getting there is somewhat more turbo lag than I expected...of course I still need to free up the exhaust a little more...going full 3" soon with a ported o2 housing as well.

Here's my prob...I have a friend willing to trade a ported/clipped 16G for the 18G. I know it'll spool faster, but is the difference worth it? I'm not looking to be an all out race car, just quick for the street (let's say trap about 105-110 mph range in the 1/4). In your (smarter) opinion, which turbo would you go with and why?

Thanks in advance for the help,

[Kracka]

Your car has serious issues if its taking until 5k rpm to fully spool. You should be hitting full boost no later than 3500 rpm's. Free up that exhaust and check for boost leaks then make your decision. Both are great turbos, but the 16G is more efficient and will spool slightly quicker assuming your 18G is also clipped (15* seems to be the norm for those). I had a ported/clipped Big 16G and loved it, I regreted ever getting rid of it. Is your 18G ported/clipped as far as you know?

[4G63Spyder]

not as far as I know...second hand. I know my exhaust is hurting me, but wasn't sure if the turbo was helping it's cause...I'll get to like 12 lbs at 3500, then it goes all the way up to 17 psi just before 5k...like someone kicked the door open.

No leaks...I've replaced every hose, every gasket, every everything I can touch or see...OCD kicked in when I bought the car.

[TheBlizzard]

What are the specs on the turbo exactly? What size is the housing, if its the 8cm that could be why its so laggy. I think most 18Gs come with a TD06 cover, TD05 turbine wheel, and 8cm housing.

18G=Spool of a 20G or bigger with the power and potential of a big 16G.

You could swap the housing for a 7cm to make it a little less laggy. Or just buy a different turbo all together and sell the 18G to some dumbfuck on Tooners.

[Kracka]

Most 18G's that I've seen have the TDO5H cover and a 7cm turbine housing. Basically the same as a Big 16G with different wheels.

[TheBlizzard]

Yeah maybe thats just the Greddy one I am thinking of. Either way its not a great turbo in todays standards.

[Jakey]

Either way its not a great turbo in todays standards.

I guess an 11.320 at 123.94mph with the FP 18G must be a pretty shitty result then.
http://linux.forcedperformance.net/merchant2/merchant.mv?Screen=PROD&Store_Code=FP&Product_Code=NTDSM18G5H&Category_Code=DSM-Turbo
http://www.dsmtimes.org/times.php?Header_Type=AllTurbo&Page=1

I guess we all need GT42Rs to make any headway on the track. ;)

[scheides]

I doubt even an 8cm housing could make that happen; I had a Super20G on my old 1G, and it spooled 20psi by about 3800 at the latest, and that is with a 10cm housing. What is your base timing set to?

I once spoke with someone who was trying to fight knock & run high boost on pump gas w/ a scm61 (which should spool on a stock motor by around 4500, right?). Anyways, he had his base timing set to -5 degrees or more and it didn't spool until like 5500 or 6000 rpms.

[TheBlizzard]

I guess an 11.320 at 123.94mph with the FP 18G must be a pretty shitty result then.
http://linux.forcedperformance.net/merchant2/merchant.mv?Screen=PROD&Store_Code=FP&Product_Code=NTDSM18G5H&Category_Code=DSM-Turbo
http://www.dsmtimes.org/times.php?Header_Type=AllTurbo&Page=1

I guess we all need GT42Rs to make any headway on the track. ;)
Yeah and Curt Brown went 10.920@124.90 on a big 16. So whats your point? I never said it couldn't make power. I just said thats it spools like a 20G and has the power potential of a big 16G.

[niterydr]

I guess an 11.320 at 123.94mph with the FP 18G must be a pretty shitty result then.
http://linux.forcedperformance.net/merchant2/merchant.mv?Screen=PROD&Store_Code=FP&Product_Code=NTDSM18G5H&Category_Code=DSM-Turbo
http://www.dsmtimes.org/times.php?Header_Type=AllTurbo&Page=1

I guess we all need GT42Rs to make any headway on the track. ;)

Don't we need a car that we can race to go to the track first?