Japorter

After been in my Cousin's JDM Spec C 415bhp STi Today (WOW I know) I gonna say...............abit disappointed!!!!!!!!!!!! which completely changed my plan for my car after months of saving.........

But........dont get me wrong the car goes like nothing I have been into before, when the turbo kicks in. However thats roughtly happens at around 4900rpm. I dont know how's that exactly drivable in the real world..

Just wondering if the name "driveable" ever existed for a 400+ 2.0 Sti??? advice please.....

dunx

iTrader: (3)

I have an MD 321H and it does take a while to get going, but then Wallop !

LOL

dunx

P.S. 2 bar is reached well before 4900 tho'......

JohnD

iTrader: (5)

I have an MD 321H and it does take a while to get going, but then Wallop !

LOL
My MD321H starts to wake up at around 3,400 Anything later than that would be unacceptable in a road car, in my opinion.
Sounds like there's excessive lag in that spec C set-up? If we were talking 500bhp I could believe it!

JohnD

wayner845

iTrader: (2)

I have a md321t which spools up a little later than the H but 4900 is way laggy .Mine has same similar power output also to your cousins and i am changing gear around the 4900 as ive already had plenty of full boost.

I think you should try a 2003 sti thats got standard turbo and a few mods and mapped to get it around 330-350 which will be a great responsive drive and more what your expecting.

Having said that when an evo passes you and you dont have power to take him bacK you may start thinking i need more power LOL.And the mods begin.

lunar tick

iTrader: (2)

John - Have you tried Harvey's up-pipe? It's very good and makes a noticeable difference. On my car (415bhp), the 321H gets going just below 3000rpm and by 3500rpm it's flying. Paul at Zen said that in terms of spool, it's just as good if not better than a completely standard car running the VF35

bigarf

iTrader: (67)

4900?what turbo has he got on it.there is something very wrong there,when mine was at 418bhp with the 321h on it was spooling from around 3500rpm.

bluenose172

iTrader: (2)

My brothers 321T makes 1bar at 3500 and is at full chat at or just before 4Krpm and is around 430-440 bhp, so something defo wrong with this car.

RA Dunk

F,ing hell that's pretty impressive stuff, considering the H is rumoured to spool 200RPM later than the 20G Im wondering how early i can get my 20G to spool , Do you have one of Harvey's downpipes (clocked) fitted as well to get it too spool like that or is it the up pipe only??

Jolly Green Monster

iTrader: (4)

Same spool point on my daily driver.. still on 2.5inch exhaust so current setup I haven't pushed it to max but it had a 20g on (400bhp) and now has a md321t (416bhp @ 1.5bar).. the md321t spools 250rpm sooner.. and is night and day in comparison in normal driving..

Simon

stevebt

iTrader: (8)

4900rpm I'm hitting 2.2bar and nearly 500bhp by those revs

lunar tick

iTrader: (2)

Just Harvey's up-pipe and GT Spec headers matey

JB1

I have 1.7 bar by 3750 rpm with an Owen 475 Garratt turbo.

Shaun

Is your boost gauge or rev counter knackered then, as Rob North's does not do that and your engine set-ups are the same, are they not?

Japorter

hmmmm....got a leak maybe??

JB1

Pretty certain they are different. For starters he doesn't have the same cooler as me, which would give different flow characteristics. Not sure about the rest as I don't know his spec. I suppose he could have got hold of the same parts I am running. Is he running the standard 475 turbo or with the upgrades? My boost guage is rubbish, but rev and boost taken from the ECU not a guage.

Anders_WR1

iTrader: (8)

Harvey's GT Spec up-pipe is a good compliment to the MD312H. I recently fitted one and spool to 1 BAR came down by 300rpm and I saw an extra 50bhp and 60lbft at 4000rpm.

Much better turbo than the standard VF35 and no less driveable in terms of spool IMHO.

Anders

RA Dunk

Am i getting this right Simon, your T spools 250 RPM quicker than your 20G?

Mus

iTrader: (2)

i thought i read it wrong im confused as i read an article by AndyF saying how he took off the 321T and replaced it with his 20G on some event.

i know that T is great with avcs heads i thought the 20G would be just as good or even better spool wise

JohnD

iTrader: (5)

It was done by Zen and has their ported headers and up pipe (lagged) and 3" catted Milltek system.

JohnD

Jolly Green Monster

iTrader: (4)

Yes.. I thought it was quicker spooling when I fitted it and road mapped it and I was sure full boost was sooner but been on the rollers since and graph shows 250rpm sooner.
thought the 20g must be damaged but checked it and all looks okay.

The only change was turbo and inlet pipe.

the downpipe is a 3inch and then meets the 2.5inch exhaust at the flange without a gentle step down which is far from ideal but may also be aiding spool at the mo.

Simon

Jolly Green Monster

iTrader: (4)

shame the scaling is different but 4250rpm on the rollers on the T and 4500rpm on the 20G

boost v power - 20g on vpower and higher plot on 10%meth

boost v power - T on vpower and higher plot on 10%meth


Will change exhaust and get some proper figures when I get time

Simon

dazdavies

iTrader: (22)

Short shifting or what!! Do your self a favour, change gear later and get the best out of your car, there's far better to come!!

wayner845

iTrader: (2)

Shall i put lots of rediculous stickers on as well lol.

dazdavies

iTrader: (22)

I was trying to help you out you thick ****!

If you're changing gear at 4900 you're NOT getting the best out of the car. Basically you're changing gear at completely the wrong time. By changing as early as 4900 you're changing gear just as the car starts to make proper power and just as the turbo is producing full boost. By changing gear at this point the turbo has to start spooling all over again.

The real power from your car will be roughly from 4500krpm - 7.5k rpm but you're changing gear just as you start to make the power your car is capable of.

It's like riding a bike that's capable of 18k rpm but only taking it to 7krpm it's like Mr Button and Mr Hamilton going round the circuit changing gear at 12krpm.

You may be reaching peak power at 4900 but you'll still be making that power until the power starts to drop off at circa 7.5krpm by changing gear so early you're taking the car out of it's sweet spot making the turbo do all the work all over again and just as it comes on power you change gear, again.

You're getting the worst from your car not the best from it. Either that or you're a complete fanny and daren't drive your car to it's full potential!

Instead of making clever remarks and not having the intelligence to realise I was trying to help you how about you go out and follow my advice just once? You'll see that I am talking sense. You're car will be alot quicker, remarkably so too.

Let us all know how you get on!!

wayner845

iTrader: (2)

Wow did i strike a nerve
Many thanks for you trying to help me out but no thanks.
I was actually making a point when i said when i change gear i wasnt being literal,sorry you were misled.Don't worry i havent gone through life short shifting but thanks for you concern.

RA Dunk

Fecking odd with the 20G, it's not the first time ive hear of one of these being so late to spool Any idea's why as to some of them can start spooling under 3K and others are mid 4k?

I think Andy.F even took his T of and replaced it with a 20G for scoobysprint just for better spool

RA Dunk

LoL, Please don't hold back Daz

dazdavies

iTrader: (22)

You know me Dunk, I say it how it is

Jolly Green Monster

iTrader: (4)

thats the annoying thing with them.. very inconsistent.. even the one on my car would be sometimes rapid and other times not.