Major differences between Newage JDM and UK STI's
16 January 2012, 03:32 PM
#1
16 January 2012, 04:49 PM
#5
Engines are stronger, different crank, larger ported heads and different cams. Also equal length headers and twinscroll turbo. Shorter gears and auto inter cooler spray, dccd from my03 also better instruments electric folding mirrors, rear wash wipe on sti models also tinted rear windows on sti. Also has a quicker rack and I believe different diffs.
16 January 2012, 05:07 PM
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Engines are stronger, different crank, larger ported heads and different cams. Also equal length headers and twinscroll turbo. Shorter gears and auto inter cooler spray, dccd from my03 also better instruments electric folding mirrors, rear wash wipe on sti models also tinted rear windows on sti. Also has a quicker rack and I believe different diffs.
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16 January 2012, 08:03 PM
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16 January 2012, 08:05 PM
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One is quick and other is @@@@@@@ quick.
Differences will depend on model years
Generally
JDM
8krpm
Twin scroll turbo
Better crank
2.0ltr uk2006 2.5ltr
Slightly quicker rack spec even quicker
Rear wash wipe Not spec C unless
HIDs lights
Yes different gear ratios due to Rpm difference on 1st and reverse the same. The does not mean flat out in top and only doing 120mph like classics.
IMHO
Tony
Differences will depend on model years
Generally
JDM
8krpm
Twin scroll turbo
Better crank
2.0ltr uk2006 2.5ltr
Slightly quicker rack spec even quicker
Rear wash wipe Not spec C unless
HIDs lights
Yes different gear ratios due to Rpm difference on 1st and reverse the same. The does not mean flat out in top and only doing 120mph like classics.
IMHO
Tony
16 January 2012, 10:24 PM
#16
I would say they are over 300bhp on std map, defo better after a filter , exhaust and a 3 port and remap for uk spec fuel, much better than uk ppp car. They are rarer as well, takes a while to find one. I also found insurance no more than a uk car. Only thing missing from my old car is the burble and they don't feel as quick due to linear power delivery
17 January 2012, 04:54 PM
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Technology and advancements, the twin scrolls a great unit and emissions can be reduced, they dont pump out as much as you think tbh, but for the power they wanted and the euro 4 laws, they had to go with less power and just stuck with the standard single scroll units, hence the 2.5's as the increase in displacement offsets the increase in emissions.
Tony
Tony
17 January 2012, 05:54 PM
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They have "different" ratio's due to the 8,000rpm rather than the UK 7,000rpm. IIRC JDM @ 60mph is only running 280rpm more than a UK car 
However not to be confused with some JDM classics (RA's Type R's but V-limited can have long 5th etc.etc) which have VERY low gear ratio's that reached max 8000 Rpm at 125mph.
Totally theoretical speeds if limiter was exactly the same but as this is achieved by fuel cut acheived. this is fairly crude but will give you all a rough idea of the differences, this figures will also alter if running 17's, 18's or 19's as rolling radius will alter etc etc etc
UK STi 2.0ltr or 2.5ltr
Ratio's 3.636 / 2.235 / 1.521 / 1.137 / 0.971 / 0.756
1st speed @ max Rpm = 35mph rpm @ 60mph
2nd speed @ max Rpm = 57mph
3rd speed @ max Rpm = 84mph
4th speed @ max Rpm = 112mph
5th speed @ max Rpm = 132mph
6th speed @ max Rpm 170mph
2nd rpm @ 60mph = 7330
3rd rpm @ 60mph = 4990
4th rpm @ 60mph = 3730
5th rpm @ 60mph = 3190
6th rpm @ 60mph = 2480
JDM Sti, Spec C etc
Ratio's 3.636 / 2.375 / 1.761 / 1.346 / 1.061 / 0.842
1st max speed @ max Rpm = 40mph
2nd max speed @ max Rpm = 62mph
3rd max speed @ max Rpm = 83mph
4th max speed @ max Rpm = 109mph
5th max speed @ max Rpm = 137mph
6th max speed @ max Rpm = 174mph
2nd rpm @ 60mph = 7790
3rd rpm @ 60mph = 5780
4th rpm @ 60mph = 4410
5th rpm @ 60mph = 3480
6th rpm @ 60mph = 2760
IMHO
Tony
However not to be confused with some JDM classics (RA's Type R's but V-limited can have long 5th etc.etc) which have VERY low gear ratio's that reached max 8000 Rpm at 125mph.
Totally theoretical speeds if limiter was exactly the same but as this is achieved by fuel cut acheived. this is fairly crude but will give you all a rough idea of the differences, this figures will also alter if running 17's, 18's or 19's as rolling radius will alter etc etc etc
UK STi 2.0ltr or 2.5ltr
Ratio's 3.636 / 2.235 / 1.521 / 1.137 / 0.971 / 0.756
1st speed @ max Rpm = 35mph rpm @ 60mph
2nd speed @ max Rpm = 57mph
3rd speed @ max Rpm = 84mph
4th speed @ max Rpm = 112mph
5th speed @ max Rpm = 132mph
6th speed @ max Rpm 170mph
2nd rpm @ 60mph = 7330
3rd rpm @ 60mph = 4990
4th rpm @ 60mph = 3730
5th rpm @ 60mph = 3190
6th rpm @ 60mph = 2480
JDM Sti, Spec C etc
Ratio's 3.636 / 2.375 / 1.761 / 1.346 / 1.061 / 0.842
1st max speed @ max Rpm = 40mph
2nd max speed @ max Rpm = 62mph
3rd max speed @ max Rpm = 83mph
4th max speed @ max Rpm = 109mph
5th max speed @ max Rpm = 137mph
6th max speed @ max Rpm = 174mph
2nd rpm @ 60mph = 7790
3rd rpm @ 60mph = 5780
4th rpm @ 60mph = 4410
5th rpm @ 60mph = 3480
6th rpm @ 60mph = 2760
IMHO
Tony
Last edited by T5NYW; 17 January 2012 at 05:58 PM.
17 January 2012, 08:24 PM
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I'm slightly puzzled by that as the Type 20 (2005 MY) is 315 bhp and that's with the Litchfield modifications.
I thought the Japanese home market had a gentleman's agreement that the cars produced a maximum of 280bhp as standard? Or are you talking about the 2.5 litre engines perhaps?
I thought the Japanese home market had a gentleman's agreement that the cars produced a maximum of 280bhp as standard? Or are you talking about the 2.5 litre engines perhaps?
17 January 2012, 08:44 PM
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I'm slightly puzzled by that as the Type 20 (2005 MY) is 315 bhp and that's with the Litchfield modifications.
I thought the Japanese home market had a gentleman's agreement that the cars produced a maximum of 280bhp as standard? Or are you talking about the 2.5 litre engines perhaps?
I thought the Japanese home market had a gentleman's agreement that the cars produced a maximum of 280bhp as standard? Or are you talking about the 2.5 litre engines perhaps?
17 January 2012, 09:36 PM
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320 bhp is bull****, my spec c, when i had it made a flywheel guessstimate of 267bhp at wrc , at their rolling road day. 
on optimax
on optimax
Last edited by tom g; 17 January 2012 at 09:37 PM.
17 January 2012, 09:46 PM
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^^ Eh, Tony says his was 316hp?! FYI my old MY55 Spec C made about 280hp as standard when on the rollers at SRR ... I was a tad down at the time as expecting 320hp 
TX.
TX.
18 January 2012, 09:15 AM
#28
I'm slightly puzzled by that as the Type 20 (2005 MY) is 315 bhp and that's with the Litchfield modifications.
I thought the Japanese home market had a gentleman's agreement that the cars produced a maximum of 280bhp as standard? Or are you talking about the 2.5 litre engines perhaps?
I thought the Japanese home market had a gentleman's agreement that the cars produced a maximum of 280bhp as standard? Or are you talking about the 2.5 litre engines perhaps?
18 January 2012, 11:29 AM
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Thanks Steve, that's most interesting. Have you got yourself a "replacement" yet (I saw you were looking at Classics a few weeks back)?
I hope everything's going well with you & yours.
I hope everything's going well with you & yours.
18 January 2012, 12:07 PM
#30
That gentleman's agreement got slightly less agreeable over the years! Most MY05 onwards JDM sti's & Spec C's straight from Japan, running on VPower usually make over 300bhp on Jap std map.
Litchfields do a IIRC generic UK map before they sell one of these which will see approx 310 to 315 bhp & 300 to 320 ft/lbs torque. (@ approx 1.4 to 1.5 bar boost, mapped not for vpower)
By adding a decat / high flow cat (ideally 3"), high flow panel filter, 3 port boost solenoid & remapping (at approx 1.55 to 1.6bar boost & ideally with uprated actuator) you will see anywhere from 340 to 360 bhp & 350 to 380 ft/lbs torque. (On V power with good engine compression).
MY05 JDM Sti's / Spec C's running a lot less than these figures is usually do to other factors causing the problem such as: poor quality fuel, low engine compression, faulty actuators / turbo, poor mapping, dodgy dyno, air leak etc etc etc. Others that claim they are running approx 390bhp on VF36/37 on std car is talking ***** or had it dynoed at Well Lane!!
Litchfields do a IIRC generic UK map before they sell one of these which will see approx 310 to 315 bhp & 300 to 320 ft/lbs torque. (@ approx 1.4 to 1.5 bar boost, mapped not for vpower)
By adding a decat / high flow cat (ideally 3"), high flow panel filter, 3 port boost solenoid & remapping (at approx 1.55 to 1.6bar boost & ideally with uprated actuator) you will see anywhere from 340 to 360 bhp & 350 to 380 ft/lbs torque. (On V power with good engine compression).
MY05 JDM Sti's / Spec C's running a lot less than these figures is usually do to other factors causing the problem such as: poor quality fuel, low engine compression, faulty actuators / turbo, poor mapping, dodgy dyno, air leak etc etc etc. Others that claim they are running approx 390bhp on VF36/37 on std car is talking ***** or had it dynoed at Well Lane!!
Last edited by rickya; 18 January 2012 at 01:23 PM.