rickya

iTrader: (18)

With the Vf36:

At what rpm did it make max torque & what was that torque figure?

TimH

iTrader: (11)

I get 1 bar at 3200 in 6th, so I would expect your 4th gear run to give 1 bar at about 3500-3600 rpm.

Shaun

My LM450 Billet hits 1bar @ 3300rpm logged (not using gauges as they are inaccurate) in 4th gear on my 2ltr. That's one of the advantages of the Billet for you and that was with a 20deg inlet temp as well.

Mel - Would be good to see what your non billet does it in, even though your estimates will be slightly out with the accuracy issue - but it will give an idea.

coper04

i have a sti9 with LM480 + FMIC Lateral Performance, and my spool in 4th is 1b at 3100 rpm.
I tuned a sti9 with LM450 + TMIC Process West, in 4th spool is 1b at 2900 rpm.

is anyone used the news turbos MD321T or V in twin scroll ?

juggers

iTrader: (1)

They are both the same turbo's apart from the wheel design.

Shaun

Before anyone gets too excited I assume this is on 2.5's?

michmout

Dear all,

I am following with interest from the beginning the development of the LM turbo series.

As of today, I plan to buy for my JDM twin scroll STi a billet version of this turbo. My car is only dedicated for race, either on track, either on rallysprint (it is like american autocross), and during the winter period I use the car on snow (I am a french guy living in Russia).
Therefore I am looking for the best performance.

My question is to know if above 4500 rpm, will the throttle response of my car equiped with LM 450 billet be as good as LM 400 billet? I am afraid to lose because of lack of throttle response speed in tight corner and therefore be slower with LM 450 than with LM400, on low speed tracks.

Second point is that all graphs comparing LM400 billet with LM 450 billet seem to compare engine with LM400-TMIC with LM450 - FMIC.
It seems that LM 450 with TMIC does not work very well because of the TMIC flow restriction above 350 gr/s. Then I should understand that it will be very more costly to run a LM 450 than a LM 400, because of the cost of modifications.

My last concern is will the JDM engine support 1,6 bar @7000 rpm a long time as it is the case with LM 400 ?

I thank you in advance for the replies of the one who already know and tested these turbo. I plan to order the turbo before christmas.

Shaun

Hi Michmout,
Initial response is the same between the two Billet turbos, however the smaller LM400 Billet will outspool the LM450 Billet - but you have to expect this with a smaller turbo. How much difference would this be above 4500rpm - neglible in my opinion.

If the ultimate in response and a limit of 400bhp is more important to you then the edge knocked off that response slight, but with an additional 50bhp on top.... go for the LM400 Billet, otherwise the LM450 Billet.

I wouldn't like to say what could be done with the TMIC - bhp limit wise.... however for track use you would be better off with a FMIC in any case (unless this is limited to short sprints).

You won't be running 1.6bar at the top end on the LM400 as the turbo won't do that. 400bhp can be seen with only 1.3bar at the top end. Choose a good mapper and all will be good.

I'm currently running 1.6bar at the top end to the redline on my LM450.... no problems at all. I'm going to be trying more boost in a couple of weeks to see how the engine responds power wise. I would have no issues running higher boost if it makes any worthwhile differences.

michmout

Dear Shaun,

Thanks for your explanations. It exactly replies to my questions.

I mistaked when I wrote 1,6 bar@7000 with LM400, I wanted to write LM450.
I will therefore buy a LM450 billet and a FMIC. Maybe try to reverse the intake manifold to short the piping length of the intake.

I will map my car myself, as I did with my VF. I can spend far more time and be more involved that another mapper. Anyway it will help me a lot if someone can send me an hex file or some basic tables (ignition and fueling) as a start point. As of today I run a map developped from a S203, with corrected fueling and ignition values, and added columns for high loads (up to 3,4 gr/s).

Once I will get the material and install it I will be happy to report the results on scoobynet.

Shaun

I've had some further changes made to my set-up, namely a bigger MAF pipe to allow more headroom in the map and also a bigger airfilter.

We did before and after runs on the dyno and the car now makes 5.5% more power than before at the same boost. That's over 460bhp on VPower and still using the OEM ECU.

michmout

I ordered yesterday a LM450 billet with 76mm intake and bronze carrier.
The point is that my JDM Sti has already 60 000 miles. Therefore I am thinking about strengthing the engine, I don't know if it can support such a big power. I already bought a GRB oil pump. Any ideas on engine modification to make it stronger?

Shaun

It should be fine imo as long as it has been maintained and running properly.

Maybe an idea to check your compression and if that's OK.... get stuck in! Change the fuel pump if it has been sometime since that was done.

The only way you will make it stronger is to pull the pistons.

michmout

I took compression and I have between 8% and 20% of leakage. It looks ok I suppose.

Concerning the fuel pump etc, my car is already ready with tampon reservoir and bosch outside pump... wait for the turbo now.

coper04

i hope you have ordered the new MDX LM450 ?
quickly spool and better flow

BIG FUD

iTrader: (84)

What is this mdx lm450 over billet?

I have the latter.

johnny_0

Good news

My Subby with my "old" LM450 (same config of my previous post so with stock intercooler but with also an improved map) and 0° of external temp, has reached 420ps (from 390/400ps. Torque not change, always 52/54kgm around 4200rpm)

Bad news

Now that the car goes fast sold my Spec C to a friend ahaaah.

rich-ita

noo,
why you sold the spec?

What was the issue in the map?

Cannon Fodder

iTrader: (100)

I believe that the MDX is the Lateral Performance version of the LM450 Billet which LP buy from Litchfield's and sell on under their own banner.

I also believe there also may be two versions of the billet turbo in existence - it all depends on when they were manufactured.

johnny_0

Want new experience. want a new car.

issue?! no Issue. Only changed some parameters (timing, afm value, etc). Map needs some adjustments due to more cold air (main reason of improvement). Then new owner will change the miltek exhaust with new 80mm tomei TI. Another guy changed his miltek system with tomei TI (8ps more).

rich-ita

which new car?

from miltek to tomei an increase of 8p s . great!
but in your-his case isn't better change the tmic with a larger it? (due to the high flow created by the lm450?)

Shaun

8ps increase from changing one free flowing exhaust to another..... I doubt that very much.

Differences between the two dyno runs and the dyno, I can believe that one!

johnny_0

yes of course i saw the two maha dyno sheet. Same configuration only exhaust changed. The new 80mm tomei full TI is really a nice exhaust and it is cheap. The only problem the "sound" is very very loud.

not every free flowing exhaust are the same. The miltek has a central silencer and the diameter is 76mm. The Tomei has no central restrictor and it is in 80mm. Very different exhaust.

johnny_0

No because for fit a nice FMIC i have to remove also the GruppeM carbon induction and it is really a great piece of kit. The cover in carbon insulates very well the air filter from heat of engine. I prefer lose some ps in the summer and keep the gruppem filter set.

rich-ita

a bigger TMIC?

harvey

iTrader: (48)

1.johnny_0 has exceeded their stored private messages quota and cannot accept further messages until they clear some space.

johnny_0

Pls try now.

presabgo

i was wondering..
the ls400ts, rcm400ts and mdx321h seems to be very simular turbos all made by turbo dynamics, anyone know what the differences are?
Also, does the twin scroll version have bigger exaust housing/flow more exhaust then the single scrolls?

juggers

iTrader: (1)

Yes they are the same turbo, the housing is not twinscroll it's twin entry.

johnny_0

At the end i kept the car and i bought a GT2 HDI newage intercooler. I've just anodized the pipes in red. So i will fit it soon.

coper04

yes, sti9 EUDM, on 2.5

and now, my sti9 is with LM500 billet, with FMIC Lateral Performance, my spool in 4th is 1b at 3300 rpm.