All you 18g people

[dsmdeliveryboy]

How much power are you making? I have a 18g on my 98 gsx with all mods and cams etc but my fuel mods aren't sufficient enough to run the turbo at its full potential so I wanna know what you guys mods are and how much your making on your 18g. Mine is the FP18g with the 14psi actuator etc and it is all monster ported.

 

[TRSblader]

Have you looked at the dyno challenge and sorted by 18g? Here's the link... DSM Dyno Challenge - 18g

judging by the lack of people there (only 4), probably not going to get a huge response. You can at least see those 4 guys' mods.

 

[Red Alert]

It won't be too much longer before I get mine back on the road, just have to find a place to get some head work done at. Before the head lifted while getting tuned it was at 27psi and pulled very hard according to my tuner, can't wait to get it back to him and see what it will do.

It's just a plain jane MHI 18G that was rebuilt and ported by Jusmx141...

 

[dsmdeliveryboy]

Wow! It looks like they made pretty easy power, the first 2 peoples mods aren't too much different than mine and they made over 350whp. Actually the 2nd guys car who made 370 or whatever has less done than my car, now I feel confident I'll make the power I want to make. I want to try and make 400 on pump+meth.

My mods in the GSX right now are ported 2g manifold, fully ported fp18g-6sl2, 3" undivided o2 housing, megan racing downpipe, hks catback, hks 272's, rc 550's soon to be 1000's, walbro 255, act2600 clutch, greddy 24v fmic with custom short route uicp, greddy type s bov, fp 4" intake pipe, hallman pro mbc, safcII right now but will be changing to Dsmlink lite, oil pressure, temp, boost, and egt gauges and will soon have a wbo2, fluidyne radiator. Also will be getting a meth kit soon, probably a devils own meth kit.

 

[dsmdeliveryboy]

Seem doable?

 

[91-gsx]

I think you can do it. Everything indicates that. The switch to Dsmlink will make tuning a much smoother process on our California 91 octane. The amount that the MAFT and SAFC setups ramp timing up is, at times, unmanageable. That problem is eliminated with Dsmlink. Back in the day, they dropped base timing numbers to make up for the MAFT and SAFC timing ramps, but it sacrifices power that you want for shifts and daily driving(If applicable).

If you want to stay on the 18g for awhile. You could maybe upgrade to a higher flowing intake manifold and/or head down the road. The potential is there for sure.

 

[dsmdeliveryboy]

I think you can do it. Everything indicates that. The switch to Dsmlink will make tuning a much smoother process on our California 91 octane. The amount that the MAFT and SAFC setups ramp timing up is, at times, unmanageable. That problem is eliminated with Dsmlink. Back in the day, they dropped base timing numbers to make up for the MAFT and SAFC timing ramps, but it sacrifices power that you want for shifts and daily driving(If applicable).

If you want to stay on the 18g for awhile. You could maybe upgrade to a higher flowing intake manifold and/or head down the road. The potential is there for sure.

Ya I just got ahold of a RVR intake manifold, and I have a 1G throttle body so I'm hoping that will help a little. Also thinking about switching the manifolds from my 1G to my 2G, my 1G has a ported Evo III manifold where my 2G only has a ported 2G manifold.. Or just buying the FP manifold

 

[dsm-onster]

Have you looked at the dyno challenge and sorted by 18g? Here's the link... DSM Dyno Challenge - 18g

judging by the lack of people there (only 4), probably not going to get a huge response. You can at least see those 4 guys' mods.

Just to note. Those turbos have various turbine wheels. "18g" is just a compressor wheel. His fp18g will do it a bit easier than the typical td05h 18g. So there's really only two there that qualify

I saw 2.1sec 70-90mph with my td05h 18g with fp2x cams and 25psi with an evo3 exhaust mani, 3" exhaust, and decent cold air intake. Id imagine the larger fp turbine wheel will certainly do more at the same boost. The biggest gains I got were from going from 24 to 28psi, not 15 to 24psi. The 18g compressor does not mind boost at all.

 

[dsmdeliveryboy]

One thing I'm worried about is my head lifting, I'm still on the stock headstuds..

 

[Aproductions]

now is there a big difference between the 18g and the e316g

 

[dsmdeliveryboy]

now is there a big difference between the 18g and the e316g

The 16g flows 505cfm vs. the 18g that flows 605 which is 45 less than a 20g I'm pretty sure so ya there is quite a bit of a difference.

 

[donniekak]

The 16g flows 505cfm vs. the 18g that flows 605 which is 45 less than a 20g I'm pretty sure so ya there is quite a bit of a difference.

Many people have logged 42+ lb/min from an evo 3, easily over 600 cfm at typical ambient conditions. The 18g and evo3 have the same exducer measurement, and the 18g's inducer is only .09" larger. But, the compressor blades on the evo3 go deeper into the hub.

 

[dsmdeliveryboy]

Many people have logged 42+ lb/min from an evo 3, easily over 600 cfm at typical ambient conditions. The 18g and evo3 have the same exducer measurement, and the 18g's inducer is only .09" larger. But, the compressor blades on the evo3 go deeper into the hub.

So how does that make the difference in power then?

 

[dsm-onster]

FP released the compressor map of the 18g a while back. It sits out at 3-4lb/min farther than the e3 16g considering the same ambient conditions. Inducer diameter being larger typically means that it has more flow potential, given the same number if fins and same general fin geometry. Yes the e316g hub is smaller allowing for more blade lenghth as it contacts incoming air. But as well the 18g compressor inducer diameter is closer to a 20g than an e3 16g. Even tenths of millimeters has a substantial effect.

 

[dsmdeliveryboy]

I feel it pulls way harder up top than a 16g even on low boost

 

[Aproductions]

So for my goal of 350-400whp.. also a daily driver, ...18g or e316g?

 

[dsmdeliveryboy]

18g for sure, the spool is very similar to a 16g but pulls a lot harder. Mine also has a monster port done to it too though, so that may have helped too. But it DEF is a legit turbo, I really am not sure why more people don't use it.. I also think FP may have discontinued the 18g, but there are other 18g turbo's.

 

[donniekak]

The 18g is a good turbo. The reason it isn't really popular, is because it fills a gap between two really popular turbo's, the evo3 16g, and 20g. The 18g and 20g are usually priced very similar.

 

[dsmdeliveryboy]

The spool of the 18g is so much better than the 20g though, but pulls a lot harder than a 16g.. It does exactly what its designed for, people wanting the spool of something similar to a 16g but something that pulls close to a 20g. They now have the FP68HTA for that, but I think the 18g is a pretty decent turbo.. There is a bit of a difference from the Greddy 18g to the FP18g too.

 

[dsm-onster]

the 68hta still has the evo3 16g turbine wheel. While the fp 18g has the bigger fp20g turbine wheel. . . It fills the gap better than the hta68 IMHO. Cramming 20g power (68 hta) throguh a 16g hot side (68 hta) is a little silly to me and only for those who want to be forced to us e85 because of such high boost to just achieve .3 sec better results. There's nothing wrong with a little more balanced turbo.

 

[dsmdeliveryboy]

Ya I wasn't too impressed with the 68HTA dyno numbers..

 

[Red Alert]

One thing I'm worried about is my head lifting, I'm still on the stock headstuds..

Make sure you have a good tuner and it shouldn't be a problem. Detonation lifts heads, not boost...

 

[pboglio]

Sounds like you have a nice turbo, I'm sure 400 w.h.p. is achievable with what you have for mods. I've heard of a few failures of the TD06sl turbine wheels over on NASIOC. This may be why FP doesn't offer it anymore, not totally sure. I'll be dropping in a 68HTA this weekend on my Subbie, hopefully the 7cm hotside isn't too restrictive. The difference is that I can drop in an 8cm housing to open up the topend, making the TD05H flow well enough for the compressor.

The performance difference between that and an 18g are minimal at best, your talking roughly ~430 w.h.p. turbos for both. I like the bigger hotside for reducing knock and reducing octane requirements though.

 

[dsmdeliveryboy]

Ya for some reason subies always seem to just open up when you put any 16g turbo and above on them, I'm wondering how much power gains I'll see when putting the RVR manifold on. Is there anything I need to know about putting it on before I do it? Or is it a direct bolt-on.

 

[dsm-onster]

An 8cm^2 fp68HTA looks ideal to me. I'd love to see how one of those performs! Sustain good boost with lower back pressure and get the full meat of the hta compressor without all that heat. If only there were a bolton 8cm^2 turbine housing. The BEP .55 a/r would be nice. But I don't think they make that for the td05h turbine any more.