tONY

 

get a graph and some car stats up asap

 

Awesome! You must let us know how it goes

 

No worries...will do

 

Had a few logistical problems with my servicing .. and delays due to the late arrival of the turbo .. but all things being equal Iain should be mapping my 420 2.0ltr derivative tomorrow afternoon ......

 

I communicated with both Iain and Simon on this and we concluded that there was probably a marginal improvement on spool up, but the 76 mm inlet is a pig to fit and you need to add cylinder head spacers like these to get it to fit.

Carl Davey, specialist Subaru Impreza parts supply

Hence I am staying with the 58mm induction pipe .. albeit the upgraded Samco one from Iain.

Not sure it helps fully 'cos I am not technical .. but hope it does a bit

 

Don't forget that the fannymould spacers don't just raise the fannymould so you can get a bigger inlet pipe in.... they also reduce the amount of heat transferred from the engine to the fannymould and the charge air within.

 

The upgraded Samco Turbo Inlet should help things out quite a bit, especially on a bigger turbo.

As for the spacers if you are running a TMIC, those aren't going to work as the TMIC won't be able to mount properly with a 10mm spacer like that. I would have to say you would have to go FMIC to use those. There is a company in the US that makes those as well. Here is a link to theirs: https://www.grimmspeed.com/catalog/p...products_id=54

 

any news when these will be on the shelf to buy??? is it just a case of ordering and waiting at the moment....

 

Apologies if Iv missed out some info somewhere but what engine work are you guys doing/done, to go with the bigger turbos? I imagine upto approx 400bhp you wont need anything doing on a JDM 2.0 litre engine, but on the bigger 450bhp turbos???

 

Look at "My Garage" for full spec

 

AAhhh, a shedload of mods!!!

 

As per previous page post ...

I have a previous graph with my current near standard spec - MY05 JDM STi, with 3" Turbo back decatted Milltek exhaust, K&N Panel filter and re-map showing 334bhp and 318lbs. For some reason this is probably a little lower (especially on the torque) than other 05 JDM STi's out there ... but it is still representative of other similar spec'd cars.

And yes, I've asked Iain to get a graph from his local RR when he maps on Friday so I will post up what comes of that as they will are the same type of rollers as the previous one. Of course there will be variations 'cos of temps, air pressure, m/c setup and all the rest of it, but it should be an interesting comparison none the less.

My spec on Sat will be the same as above except that I am adding a catted centre section to the exhaust to help with MOTs and to quieten it down a bit (decatted twin scrolls can be pretty noisy with a Milltek). I also now have a 'snorkotomy' (ie the air intake resonator box in the inner wing has been taken out), a 3 port solenoid is being added and a Walbro 255 fuel pump is being added too (probably unnecessarily, but that was my choice), the turbo inlet pipe is being changed to a smoother one direct from the standard airbox (am staying with the std 58mm diameter), I'm upgrading the injectors to Iain's own 800cc ones and I'm going for the 'midrange' 420bhp turbo with the heatshield to reduce temperatures affecting the top mount (which I am also staying with).

Iain advised me that whilst this turbo derivative has a lower top end power than the 450 version it still has very good midrange performance, and more importantly to me as I do quite a bit of motorway driving and am frequently accelerating in 5th and 6th, it is much better able to cope with accelerating from 2-2.5k revs than the 450+ version.

Oh .. and I am having a remap obviously - and, as the JDM has the facility for gear specific mapping , Iain is going to do that too, but we're stopping short of launch control as I don't do any standing starts and don't want it breaking.

Hope that helps as I think this would be a typical, or similar, upgrade for many others 'out there'

 

I was on the way to ian last week untill the t25 started knocking at my door not good will be back the weekend though yipeeeee.

Looking forward to graphs but ill keep mine standard for scoobysprint if its still happening this year..

 

T20 driver thanks for the info. From what you have researched, will 420bhp will be ok on std internals? I would like to know as this could be an option for me too.

 

Tim,

I have just emailed you the road dyno plot

still sat in the car now..

Simon

 

That is one of the reasons why I went for the 420 instead of 450 .. although Iain thought there was still some headroom .... I suspect I'll still need a new clutch before long though as have 55k on the clock ..

 

Hmmm....interesting

 

road dyno gives 460bhp/430lbft. RR shows 30ftlb less torque.

Full boost (1.5bar) at 4000 rpm, 1 bar at 3000 rpm.

Bit disappointed with the torque I think...and boost coming in a bit higher than I would have hoped.

 

Tim, sorry to hear that you are not fully impressed.

Still looking forward to seeing the graph when you get it up.

 

Just a deltadash plot for now.

I've not driven it yet, so my reaction is purely based on figures - but for a twin-entry, hitting 1.5bar at 4000rpm seems a bit poor to me. Hopefully there'll be a good explanation and something that can get tweaked!

An MD555 would probably have produced more torque, and hit full boost lower down, for less money. But, as I say, not driven it yet, and Iain not had a chance to comment so I might be jumping the gun.

 

Is this a 58mm or 76mm inlet? I am no tuner but it seems decently choppy up top. Hopefully Iain can help explain or get things sorted out. I agree your torque seems decently low especially on a 2.5L. I am sure it will still be plenty of fun.

I wonder what kind of graph you would get if you did a road log and used Airboy's Spreadsheet to graph it out.

 

76mm inlet. It's choppy because it's a delta dash plot and they're always like that as far as I know

Yes - it will be great fun compared to what I had before without a doubt

 

Could the 76mm inlet be a cause of slower spool, but it should give you better top end. Also I don't know the extent of your build, but you don't have any TGV's in your Intake Manifold?

Are you picking it up tomorrow morning?

 

Yes - picking it up tomorrow morning. Will get the proper dyno graphs then and will post them up in the afternoon.

I don't think there are TGV's in the JDM STi manifold.

 

Wil lyou be using this car for everyday use or trackdays only?

 

Everyday, plus 3 or 4 trackdays a year

 

Cool I look forward to seeing the graphs.

The JDM STI Manifold doesn't have TGV's, just wondering how your build was done. People going to a 76mm Inlet (3in) here in the States people do TGV deletes on their 2.5L, otherwise it won't help to have the larger inlet.

I hope T20 Driver's tune turns out well for him, can't wait to see a 2.0L tune.

 

Argh right cool won't it be an **** ach with such late spool up on your daily trip?

Seems good as a trackday setup tho.

Immy

 

That's what worrying me, yes. But until I actually drive it tomorrow, it's difficult to know for sure.

Just to add to this - this is the first example of this turbo to be tried so there may well be teething problems, and any problems may not be related to the turbo of course. I will be speaking with Len at S4U, Iain and Simon tomorrow to see what's up. I know they will all work with me to get the best result from my build