Thoughts/opinions guys. Want minimal lag, turbo will be either MD321H, RCM420 or SC42

 

I would stick with std Sti TMIC or go with Hyperflow TMIC. I had a one & great bit of kit but pricey. But if you'r aiming for more than 450bhp then FMIC may be better.

 

If you want minimal lag you should buy SC46 which are great turbos which have amazing spool.

About the TMIC,you will be still limited by TMIC,if its no money object go for Hybrid HDi which are proven and you will see hardly lag.

TMIC is good,but you will suffer with heat soak etc.


Jura

 

sc40 is same just sc46 can give bigger numbers, but i am on standard internals

 

Bez is making 487 bhp on the TMIC

dunx

 

i have run the hyperflow top mount with the md321h turbo on an sti8 with standered internals.was making 418bhp @1.5bar of boost and was very responsive.

 

Thanks arf, I am still in two minds, alot of people telling me the TMIC is crap and will cause det, and others telling me they took the FMIC off when they had the 321H on. I was in revolution today and we were talking about putting a clever water spray on the car with a hyperflow TMIC and zircotec'ing the uppipe and downpipe as well as headers.

 

Water spray is intended for use in static conditions or when setting off just after a stationary period when there is heat soak. It is not intended for ongoing use during normal running or flat out running. If you care to set up an ACT guage and then do some experiments you will soon realise that the water spray has little effect once you have been in motion for a couple of minutes.
Ceramic coating the uppipe, downpipe and headers sounds like a very expensive option and on the hottest sections it will have flaked within 2 years. Properly DEI heat wrapped and it will last longer for a fraction of the expenditure.
For what it is worth I went from an STi 8 top mount at 392 bhp and straight out the box with no other change had 401 bhp from an HDI FMIC. With mapping we ended up at 410 bhp. The HDI FMIC has a lower pressure drop than any large TMIC we have come across and therefore has advantages right from the beginning before you even examine the thermal properties.

 

Thanks Harvey, excuse my ignorance as I don't fully understand the workings of a front mount, but it has pipes at either side of the intercooler at the front. Is one a flow and the other a return? People say they have experienced reduced throttle response with a front mount including Andy Forrest. This car will primarily be a road car, and I understand the I need to reduce detonation by running as cool a charge temp as possible, I don't intend running ECU software that can adjust det or running a charge temp gauge. But is it overkill to install a FMIC when aiming for 400bhp on a newage????? The car accelerates quickly now from around 3400rpm at 1.5 bar, I dont wanna make this any less quick acceleration wise by installing a FMIC and a larger turbo. The aim is to get a quicker spooling car with more torque and top end. i plan on running standard internals all but larger injectors. I have spoke to a few mappers about this, but being mechanically retarded I just thought I'd post the question. Are you going to the NBO, if so would love to have a chat with ya.

 

A front mount intercooler takes the hot compressed air charge from the turbo through the inner wing through a front mount core and through pipework on the passenger side of the car to the throttle body.
The power you are aiming for will determine the size of injectors your require.
If you let me have your full spec, model and year, I will give you whatever input I can.
The purpose of water spray is to allow this to be homologated on rally cars which may have to sit for several minutes, static, before the beginning of a stage. Because of the position of the top mount it becomes badly heat soaked and the purpose of the water spray is to dissipate heat from the intercooler core prior to and during set off. It is not effective when the car is in motion.
With a front mount you will get more power from whatever turbo you run in the 400 bhp bracket and you have to consider this against any marginal increase in lag which if properly mapped on an efficient front mount will be almost non existant.
Regardless of whether you run top mount or front mount, with the modifications you propose you will need to have your car custom mapped.
harveysmith1@btopenworld.com and please include your telephone contact details and I will be in touch.

 

Hi there you do get heat soak with the top mount intercooler, you will need to monitor charge temps, you will find 5 seconds after pulling away charge temp will be ok with the Hyperflow top mount, if you are doing sprints, just spray down while in the que.




I am running a GT3076 with 20% meth at 1.4bar boost very little lag, ace fun to drive.
This is a 2.5 not a 2.0.

I believe mine is the highest powered Subaru with a TMIC in the country. But I might be wrong,

Everybody goes frontmount,
Go Hyperflow TMIC, monitor charge temps, Fit water spray, enjoy no lag.

Bez

 

But you might gain 50 bhp with an FMIC

dunx

P.S. Currently running for the bus. Or cycling if it's dry !

 

Bez,
Interesting results..... I was under the belief that the Hyperflow TMIC was not any better than a Newage TMIC. Did you try the Newage TMIC before swapping to a Hyperflow unit? I know a Newage TMIC will enable a STI to produce over 480bhp as another "well known" individual has done it (caveats apply so don't read that as a recommendation).

What are your charge temps when holding out in top gear on a hot day, going in excess of 120+mph..... or is that not something you do (serious question not a cheap dig mate)?

The fact "you will need to monitor charge temps" with that set-up suggests to me it is not really an option.

 

Over the last year the car has become almost exclusively a track-car... although still road legal.

For sprints and drag runs it's fine. but still some work in progress with regard to cooling and monitoring. At 1.4 bar it should be fine, but I personally wonder what the engine would make at a "proper" boost level with a FMIC, but Bez worries about throttle response.

dunx

P.S. Bez does love his TMIC tho'.

 

Is there much diference between hyperflow tmic and newage tmic??

 

Sprints maybe fine, but you wouldn't really want to take this approach for proper track use. Caveats apply to using *most* types of TMIC in formal track environments with the Impreza.

 

Bez is the blocked a standard EJ257?

 

But you might gain 50 bhp with an FMIC

dunx

P.S. Currently running for the bus. Or cycling if it's dry !

Been told will get 50bhp more with a front mount, and then pos even more with another map.

Shaun.
I went straight from WRX top mount to Hyperflow top mount. My target is in my name.
Bez 300. I was only going for 300 bhp.
some times we forget 300bhp is a massive amount of power,
it would be good to see other results from other top mounts.

Monitoring charge temps is for when you are in line for the sprints. When driving its not a problem.

driving at 120mph, I will check charge temps, I am going to the ring in 4 weeks, (know what you mean)

Who is the other well known with 480 from a top mount

Mus, Don't know, thought the hyperflow was best, but might be wrong.

As dunx says. 1.4BAR boost charge is not a problem

Banny.
The block is a std 2.5 WRX ej255
But the part number is the same as ej257. good for 650
but all the parts in the block have been to the gym with you, bigger and stronger.

I know if I want even just another 10bhp I will have to go fmic & stand alone ecu as I am still running EKUTEC


Bez

 

Bez,
I assume you mean 50bhp with a FMIC not a top mount. lol

Interested to hear how you get on at the ring with it charge temp wise.

AndyF is the "other".

 

I did mean front mount,(Edited) but Shaun, you know all about the confusion between top mount & front mount, and all the pipework

Andy F 8sec car was running a top mount as well.,,,, But now in Poland I believe
I know his new flat 6 is a front mount. ( super build )

Bez

 

Roflol - very good Bez.

I was referring to Andys Spec C still running OEM TMIC.

 

A top mount may have an application on a quarter mile car but it may preclude the car from top speed runs or normal hard road use.

 

I have a Hyperflow TMIC on my Legacy, what waterspray kit did you get for yours Bez?? I'm after something similar myself and want to keep the TMIC setup too

 

His lad and a garden sprayer...

 

I new he was running some good power with the spec C, but I thought he was just a fantastic driver, but running that much power, and the fact he is a fantastic driver, thats why he was doing so well.

Bez

 

Hi Harvey, I use the car on sprints and 1/4s and track days, but the last trackday I was only running 350bhp, not done a trackday with the new engine.
But I will definitely take on board what you are saying, I will be watching the charge temps. I have also increased the size of the bonnet scoop

I have been told that the Hyperflow top mount is better than some of the cheap Chinese imports.

Bez

 

The water spray was just made up from bits of ebay, nothing too fancy,
I have reversed my strut brace and welded a deflector to it and fitted 2 water sprays to the deflector,

Then made a shield for round the TMIC to make sure all the air coming into the intercooler goes over the intercooler.

I know cooling is an issue, so I have also fitted a motorsport radiator, a large oil cooler for the engine, a oil cooler for the gearbox,
up to now no issues with the cooling of anything,
I only use the water spray when waiting in line for the sprints,

Bez

 

With the minimal change in lag and the massive difference in temperature on a road car, especially when in traffic, stopping/starting and general use and FMIC is always recommended unless restricted to otherwise.

The only thing to consider generally is a change in induction, which with the newage cars can mess up maf readings and more often than not if it isn't shielded correctly from engine bay temperatures will ruin the gain you get from running the FMIC.

Graham

 

Hi Graham, thanks for your input,
I am running a an inner wing cold air induction kit, and running maffless when on boost.
I think I am doing everything as I should for running a top mount and keeping things cool,

Bez

 

In my old MR2 turbo, where the IC is very close to the block and does get hot, before a sprint I used to spray the thing with plumbers pipe freeze spray!

You must be able to rig up a remote fire of that stuff!

I went FMIC from harvey for track days- when downloading logs sustained periods on WOT as in on a track day boost those temps like crazy, so the Hybrid keeps all cool.