Standard Internal Limits on MY97 WRX
29 July 2009, 10:19 AM
#1
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Standard Internal Limits on MY97 WRX
Aiming for around 400bhp'ish on my '97 Impreza WRX, but need to know what the standard internals are capable of coping with.
Spec:
3" Turbo Back
Headers/uppipe
FMIC
550cc Injectors
FPR & Fuel Pump
Induction Kit
Runs on the standard turbo... not sure if its a TD04 or 05, can someone shed any light?? But am planning on getting a TD05-20G to get me closer to the 400bhp but before spending that money didnt know if I had to source some forged internals first??
If i am looking at different internals, what exactly am i looking for and where to get them? I'm told the bottom end of an STI would suffice??? Correct? Incorrect??
Cheers
Mark
Spec:
3" Turbo Back
Headers/uppipe
FMIC
550cc Injectors
FPR & Fuel Pump
Induction Kit
Runs on the standard turbo... not sure if its a TD04 or 05, can someone shed any light?? But am planning on getting a TD05-20G to get me closer to the 400bhp but before spending that money didnt know if I had to source some forged internals first??
If i am looking at different internals, what exactly am i looking for and where to get them? I'm told the bottom end of an STI would suffice??? Correct? Incorrect??
Cheers
Mark
29 July 2009, 11:00 AM
#2
Std turbo should be a VF22 (but could be a 23 or 24 - depends on what Subaru had lying about in their parts bin! lol)
If you want to make 400+ - and not below it! - you'd need a Lateral Performance MD321T / Enginetuner S206 / Harvey Smith HS420 turbo... and they'd prob make it on 97 RON only!
If you were to get a Andy Forrest TD05H 20g / MD321H / HS380, then you'd have to map it on V-Power + NF(or meth/E85) to be SURE of getting 400+.
Oh and you'll need 650 or 740cc injectors. 550s with an FPR and upped pressure might see you to 4000bhp too.
STi v.9 rods should be okay, but I think you'd need something better than OEM forged STi v.3/4 (or v.5/6) pistons .. Cosworth/Mahle, etc. ones spring to mind (STi v.9 ones might be okay as well).
Also fit ACL 'Race Series' main and big-end bearings too.
If you want to make 400+ - and not below it! - you'd need a Lateral Performance MD321T / Enginetuner S206 / Harvey Smith HS420 turbo... and they'd prob make it on 97 RON only!
If you were to get a Andy Forrest TD05H 20g / MD321H / HS380, then you'd have to map it on V-Power + NF(or meth/E85) to be SURE of getting 400+.
Oh and you'll need 650 or 740cc injectors. 550s with an FPR and upped pressure might see you to 4000bhp too.
STi v.9 rods should be okay, but I think you'd need something better than OEM forged STi v.3/4 (or v.5/6) pistons .. Cosworth/Mahle, etc. ones spring to mind (STi v.9 ones might be okay as well).
Also fit ACL 'Race Series' main and big-end bearings too.
Last edited by joz8968; 29 July 2009 at 08:58 PM.
29 July 2009, 11:05 AM
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Thanks for the reply mate
Just somewhere around the 400bhp would be fine, defo sticking with 550cc injectors and biggest turbo as TD05 20G though, so know i'll only probs only reach the 380ish mark.
So if my standard turbo is a VF24 what are they rated upto?
And for around the 400ish mark will my standard internals cope?
Ta
Just somewhere around the 400bhp would be fine, defo sticking with 550cc injectors and biggest turbo as TD05 20G though, so know i'll only probs only reach the 380ish mark.
So if my standard turbo is a VF24 what are they rated upto?
And for around the 400ish mark will my standard internals cope?
Ta
29 July 2009, 11:12 AM
#4
Sorry mate - have added/amended to my original post. Please reread it...
VF22 is the biggest of the three, out of VF22/23/24. It was a factory option on the 22B (23 being fitted as std). I think they're similar in performance to the VF34/35, so around the 350 mark.
VF22 is the biggest of the three, out of VF22/23/24. It was a factory option on the 22B (23 being fitted as std). I think they're similar in performance to the VF34/35, so around the 350 mark.
Last edited by joz8968; 29 July 2009 at 11:15 AM.
29 July 2009, 11:14 AM
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I had a look and estimated for the rods/pistons/bearings and the twin scroll 2ltr grooved/nitrated crank, your looking at about 1350 quid all in, which isnt bad actually 
Add the cost of an uprated oil pump and possably an engine oil cooler (though not necessary you may as well do it if your spending the cash
) plus the cost of the rebuild.
Tony
Add the cost of an uprated oil pump and possably an engine oil cooler (though not necessary you may as well do it if your spending the cash
) plus the cost of the rebuild.Tony
29 July 2009, 11:15 AM
#6
Joz the VF22 is fragile and it is not recommended to run it above 1.4 bar as the turbo blades have be known to shatter. 550cc injectors with raised fuel pressure will see you to your 400bhp target.
Personally you will be pushing the engine at 400bhp and it will be on the limit, so dont expect it to last too long and plan for an engine rebuild.
Banny
Personally you will be pushing the engine at 400bhp and it will be on the limit, so dont expect it to last too long and plan for an engine rebuild.
Banny
29 July 2009, 11:27 AM
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Cheers for the advice lads...
"I would not push the cast pistons on your engine much above 350 bhp to maintain reliability and longevity. If you can find a short block from a newage sti then I would stick that in for your 400bhp target, as it is much more robust and the rods are of a better design"
I dont know how to do the quote thing, but have brought this across from other thread Banny...
Can i take this off any year newage sti? Blob, Hawk or the other one
Approx costs of picking one up 2nd hand?
"I would not push the cast pistons on your engine much above 350 bhp to maintain reliability and longevity. If you can find a short block from a newage sti then I would stick that in for your 400bhp target, as it is much more robust and the rods are of a better design"
I dont know how to do the quote thing, but have brought this across from other thread Banny...
Can i take this off any year newage sti? Blob, Hawk or the other one
Approx costs of picking one up 2nd hand?
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29 July 2009, 11:39 AM
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Remember reading in some Jap mag ages ago that the Classic STi internals are good for around the 400 mark... but going off what Joz has said:
"STi v.9 rods should be okay, but I think you'd need something better than OEM forged STi v.3/4 (or v.5/6) pistons .. Cosworth/Mahle, etc. ones spring to mind (STi v.9 ones might be okay as well)"
... is this not true, or again is it the case it will work but wont last long??
To be honest i'm not up for spending another £1000-2000 in the very near future, so will probs just keep internals standard. So this being the case, am i going to be safe running standard internals with this spec:
3" Turbo Back
Headers/uppipe
FMIC
550cc Injectors
FPR & Fuel Pump
Induction Kit
... and maybes with the addition of just the normal TD05 turbo??
"STi v.9 rods should be okay, but I think you'd need something better than OEM forged STi v.3/4 (or v.5/6) pistons .. Cosworth/Mahle, etc. ones spring to mind (STi v.9 ones might be okay as well)"
... is this not true, or again is it the case it will work but wont last long??
To be honest i'm not up for spending another £1000-2000 in the very near future, so will probs just keep internals standard. So this being the case, am i going to be safe running standard internals with this spec:
3" Turbo Back
Headers/uppipe
FMIC
550cc Injectors
FPR & Fuel Pump
Induction Kit
... and maybes with the addition of just the normal TD05 turbo??
29 July 2009, 11:52 AM
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The pistons are better in the STI's but the rods afaik are the same as the uk/jdm wrx's, and they suck 
400bhp is asking for trouble if your after reliability
For example parts prices
Subaru Impreza V9 Crankshaft ACL Competition Bearings on eBay (end time 13-Aug-09 21:54:29 BST)
Subaru Impreza EJ20 Forged Pistons Manley Steel Conrods on eBay (end time 20-Aug-09 12:52:16 BST)
Tony
400bhp is asking for trouble if your after reliability
For example parts prices
Subaru Impreza V9 Crankshaft ACL Competition Bearings on eBay (end time 13-Aug-09 21:54:29 BST)
Subaru Impreza EJ20 Forged Pistons Manley Steel Conrods on eBay (end time 20-Aug-09 12:52:16 BST)
Tony
29 July 2009, 12:01 PM
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Gee-zas! Canny pricey!
Think i'll probs just try and get hold of a TD05 and be happy with 350bhp for now... this being my first attempt and that.
Cheers for all the help lads, much appreciated
Think i'll probs just try and get hold of a TD05 and be happy with 350bhp for now... this being my first attempt and that.
Cheers for all the help lads, much appreciated
I think thats pretty reasonable
29 July 2009, 12:15 PM
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Hahahaha, we'll just say for my budget then... its a credit crunch ye nah!
Dont think thats stopping the bloke over the road from me like, he's got a 1/4 million pound proper WRC Impreza... didnt think you could even spend that much on an impreza!
Dont think thats stopping the bloke over the road from me like, he's got a 1/4 million pound proper WRC Impreza... didnt think you could even spend that much on an impreza!
I was agreeing with you about the turbo on the car 
29 July 2009, 12:51 PM
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nothing past 6, this is the confusion, that nitrated crank I pointed out would be "theoretically" out of a version 9 car, if you point a version 9 uk car (but as they dont exist then its pretty impossible ) the crank isnt grooved and nitrated, so is in fact inferior Tony
29 July 2009, 02:15 PM
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a wrx 97 eninge is on the danger limit even at 350bhp a vf 22 even with all mods will not get there i now this is tried and tested by myslef you need a at least a vf34 or td05-18g with FMIC to make 350bhp or a new age tmic but you standard internal are not goign to like 350bhp about 320 and yor shoudl be ok and that depneds on how good nick they are in now check my spec out in my garage i have a wrx 97/98, your even pushing an old sti classic at 350bhp -380bhp
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