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Why does no one use the 18G ?

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ddavisaf said:
Just don't get it clipped..... talk about lag.....sheesh!
Click to expand...
How bad is the lag? I know from there ad they list it as already clipped, not an option you have to pay for. Is the top-end worth it?
 
I have the Greddy 18g and I like it. It spools pretty quick and in third it rails. Don't listen to people knock it who haven't even used it, it's a good turbo just not very common.
 
I also have an 18G is a good turbo but i haven't tested its full potential cus i have some boost creep problem but i'm fixing that...DAMN 3" TURBO BACK EXHAUST!
 
RipperXX said:
Let us know what your times are!
Click to expand...

Track sucked, to traction til 3rd, here's my times.

92 fwd, stock motor, fmic, 510's, 190lph, maft, azenis tires, 94 octane pumpgas, 20 psi

.815
2.215
6.012
8.888
88.01
11.311
13.346
111.73

Best mph of 112.55 came on 22psi and about 2 gallons of 110 mixed in for a little added safety, but I think I could've done without it.
 
Steve Hebert said:
FP is currently out of 18G's. I had just inquired about it and here is the response I received today..

"Steve,

You have asked about the 18g turbo which is rated up to 400whp, that
would be a good turbo and inexpensive to get you to your current
goal, but unfortunately I am currently out of 18g compressor wheels
and it may be a few weeks before we get more in.The T3/T04E would be right about similar range, but the biggest
difference with it would be it is a T3/T4 flanged turbo. You would
need to purchase either an adapter flange or a different manifold to
make this turbo work with your set up.

Another suggestion I have would be the Evo 3 16g. This turbo has
incredibly fast spool up, as well as great top end performance. It is
also rated at 42lb per minute which is more than the the 18g and
nearly as much as a 20g turbo. It is also rated to be a 400whp turbo.
The convenience of it being able to mount to the stock DSM manifold
is also a bonus. We are receiving a shipment of these turbos this
week and have listed them on sale as of today, the current price is
$539 for the Evo 3 turbo. This is also a brand new turbo and is not
refurbished. If you are interested in having it ported for better
flow and performance, we do offer porting on this turbo for $95.

If you have any other questions, please let me know by either calling
or emailing me back. If you are interested in placing an order, you
can do so either online, through email or also by giving me a call.

Thank you!
Amber"

Notice they said the Evo 3 16g flows more than the 18G. And considering they are selling the Evo 3 16G for $100 less than the 18g.
Click to expand...

Woe. I really am not flaming you Steve, but i am questioning who wrote that email. i thought it was common knowledge that the 18G compressor wheel flows more than the evo3 16g and, in fact, is closer to the 20g than the evo3. the inducer diameter of the evo3 is 1.902" and the 20g is 2.070" and the 18g is 1.992" which is also closer to the 20g than the evo3...
 
Stapl3 said:
http://linux.forcedperformance.net/...OD&Store_Code=FP&Product_Code=NTDSMB16G5HwoTH

That is the best deal ever. Better/cheaper than a 16g and from a company like Forced Performance. Why anyone still bothers with 16g's over this is still a mystery to me.
Click to expand...

I thought the exact same thing when I first started researching turbos. After reading tons of posts regarding 16G's I just came to the conclusion that people still use them because;
1) They are track proven and very streetable.
2) Relatively inexpensive as in initial price and supporting mods.
3) There are hundreds if not thousands of threads of tech info for the 16G.
4) They are known to be very reliable.
 
I have the no turbine housing 18g from FP and it set me back $460 to my door with a few crush washers and gaskets. I added a fmic, turbo transmission, and a set of 510 injectors and my time dropped from a 14.5 last year at 103.5 on pump to 13.3 @ 11.7 on pump this year. This turbo works and works well. Very streetable, not much lag, in fact I could almost use a little more lag to try and help it hook up in the first two gears.
 
I ran an 18G till I sucked a coupler into it. Worked fine for me. Spool'd pretty decent. Went 12.8 on it before I killed it. Had a lot more in it especially with the mods I have now.
 
half-cocked said:
I thought the exact same thing when I first started researching turbos. After reading tons of posts regarding 16G's I just came to the conclusion that people still use them because;
1) They are track proven and very streetable.
2) Relatively inexpensive as in initial price and supporting mods.
3) There are hundreds if not thousands of threads of tech info for the 16G.
4) They are known to be very reliable.
Click to expand...
You forgot to add that very few go off the beaten path.
 
I'll chime in. I have an 18G and like it, although no track times yet (I just got my TB rebuilt, as the seals were leaking badly). I have it with the TD06 compressor housing, which supposedly helps with efficiency. Spool-up is practically identical to the Big16G, which is what it replaced on my car. I'd recommend this turbo without hesitation, even though I haven't tapped its potential just yet-- I've only gotten 34 lbs/min out of it so far, which I feel is nowhere near its max output.

<--- BTW, those dyno numbers were with the Big16G; the 18G feels a bit stronger on the butt-o-meter, but I have yet to confirm that.
 
dsm-onster said:
Woe. I really am not flaming you Steve, but i am questioning who wrote that email. i thought it was common knowledge that the 18G compressor wheel flows more than the evo3 16g and, in fact, is closer to the 20g than the evo3. the inducer diameter of the evo3 is 1.902" and the 20g is 2.070" and the 18g is 1.992" which is also closer to the 20g than the evo3...
Click to expand...

That's one of the reasons why I posted the E mail. Didn't make sense to me.. But who am I???
 
Does anyone know why FP stopped selling the 18g CHRA and replaced it with a B16G CHRA? Is it still available? I was hoping to replace my b16g with bad seals...
 
Agent11br said:
Does anyone know why FP stopped selling the 18g CHRA and replaced it with a B16G CHRA? Is it still available? I was hoping to replace my b16g with bad seals...
Click to expand...

Not sure, might have run out since it was such a good deal. I'd e-mail them and ask if they have any more available.
 
i just recieved mine last week and the week that i ordered my FP 18GWOTH they had a few 18G CW's left, unless the tore apart a $639 18G5H just to satisfy a customer??? :D
other than that i haven't gotten to run my car yet due to it being half nekkid (paint/body)
but seriously, the step inside the compressor housing is absolutely neccessary, if it had no step and was just bored out even with the inducer the inlet would be thinner than the bottom lip on a dixie cup. all in all it dwarfs the E3 16G in Compressor wheel size :thumb: .
 
The EVO III compressor wheel is 1.902"-inducer. The 18G is 1.990". Basically the 18G is a small 20G. If anyone can get a deal on the 18G go for it. If you are paying heads up against an EVO go with the newer desighned wheel, the EVO. When I had a onquest FP was offering 18G upgrades to our 12A's for $420. and that was a great deal that many Quest owners took advantage of. Mark
 
dsm-onster said:
Woe. I really am not flaming you Steve, but i am questioning who wrote that email. i thought it was common knowledge that the 18G compressor wheel flows more than the evo3 16g and, in fact, is closer to the 20g than the evo3. the inducer diameter of the evo3 is 1.902" and the 20g is 2.070" and the 18g is 1.992" which is also closer to the 20g than the evo3...
Click to expand...

Well the 18G flows 40lb/min and the Evo3 16G flows 42lb/min (20G is 44lb/min). I'm not sure where you get your info but inducer/exducer ain't everything. The Evo3 16G actually has a smaller "hub" so despite the possible inducer/exducer difference the blades have more surface area.
 
dsm-onster said:
Woe. I really am not flaming you Steve, but i am questioning who wrote that email. i thought it was common knowledge that the 18G compressor wheel flows more than the evo3 16g and, in fact, is closer to the 20g than the evo3. the inducer diameter of the evo3 is 1.902" and the 20g is 2.070" and the 18g is 1.992" which is also closer to the 20g than the evo3...
Click to expand...

amber wrote that.
 
BatmanGSX said:
Well the 18G flows 40lb/min and the Evo3 16G flows 42lb/min (20G is 44lb/min). I'm not sure where you get your info but inducer/exducer ain't everything. The Evo3 16G actually has a smaller "hub" so despite the possible inducer/exducer difference the blades have more surface area.
Click to expand...

I got off the phone with FP yesterday and i was going to order a 20g in a TD05H housing, after selling my 18g, stuffed in a TD05H housing. From what that dillhole told me (yes he was an erragant ass) The evo3 flows more than the 18g they make, why they sell the 18g he said because people think bigger is better. He also said the 20g wheel in the small housing would really restrict flow and the snout might snap off. I eventually went with the t04b :thumb:
 
Another reason for not using the 18G is hybrid turbos. They can spool faster than a 20G and still deliver just as much or more air.
 
18gs used to be about the same price as a 20g so people would either buy a 16g or spend the extra 50 or so bucks to get a 20g as opposed to a 18g
 
BatmanGSX said:
Well the 18G flows 40lb/min and the Evo3 16G flows 42lb/min (20G is 44lb/min). I'm not sure where you get your info but inducer/exducer ain't everything. The Evo3 16G actually has a smaller "hub" so despite the possible inducer/exducer difference the blades have more surface area.
Click to expand...

Again not to flame... But for the sake of clarification for everyone and to show where this information can be found:
18G compressor map ... straight form the stealth316.com website.

According to the DSM_Tuning_Sheet_v2.1.xls found elsewhere here, multiply cfm by 0.08 to get a good approximation of the lb/min. Since the 18G is rated at 590 cfm, that comes to around 47lb/min at STP. not 40lb/min or even 42lb/min. If the map I am using is wrong then I stand corrected.

EDIT:

Research stating it flows at 600cfm here.
 
If you read the site you'll find out that they don't have an actual 18g compressor map and that the map you tried to link to was a combination of the big 16g and 20g maps with some intelligent analysis thrown in. Far from definitive. I searched my ass off before buying the tdo5 18g from FP for a compressor map and to no avail.
 
mavisky said:
If you read the site you'll find out that they don't have an actual 18g compressor map and that the map you tried to link to was a combination of the big 16g and 20g maps with some intelligent analysis thrown in. Far from definitive. I searched my ass off before buying the tdo5 18g from FP for a compressor map and to no avail.
Click to expand...

I stand corrected :D . But does not a tdo5 18G flow more than a EVO3 16G? I thought it was around 50 cfm more and that the tdo5 20G flowed around 45 cfm more than that.
 
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