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Old 15 July 2012, 10:01 PM
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johnnybon
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Default How far to push

How far can you push a v4 jdm sti 20ltr hp wise that is
Old 15 July 2012, 10:39 PM
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General rule of thumb is 330 however you should judge each car on its own merits.
Some **** themselves at 300 and some run sweet at 380.

Impossible to say what is and what's not safe power.
Old 15 July 2012, 10:43 PM
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380 in mine for gd few months sweet as. Sti 3 , standard dccd v3 box
Old 15 July 2012, 10:49 PM
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Originally Posted by sonic93
380 in mine for gd few months sweet as. Sti 3 , standard dccd v3 box
i would say you are one of the lucky ones.
Old 15 July 2012, 11:12 PM
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360 in mine on a 2.5 second track day booked il keep you posted !!
Old 16 July 2012, 07:53 AM
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Thanks for your views guys I'm running 330with a vf35 was just thinking of turning up the gas with a bigger turbo should I not bother or what turbo should I go for ws thinking on a td05 20g would this be of any advantage over the vf ?
Old 16 July 2012, 08:52 AM
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Originally Posted by johnnybon
Thanks for your views guys I'm running 330with a vf35 was just thinking of turning up the gas with a bigger turbo should I not bother or what turbo should I go for ws thinking on a td05 20g would this be of any advantage over the vf ?
it would be a very good upgrade,ive got a afp20g for sale if interested,its in for sale section.
Old 16 July 2012, 09:57 AM
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I wouldn't want to push a standard 15 year old Impreza engine anywhere above 330bhp, unless ofcourse you can afford to fix it 'when' it decides it's had enough.
Old 16 July 2012, 09:57 AM
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Originally Posted by leecalcars
360 in mine on a 2.5 second track day booked il keep you posted !!
Standard spec 2.5 ???
How much boost you running ?
Old 16 July 2012, 09:59 AM
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Originally Posted by sonic93
380 in mine for gd few months sweet as. Sti 3 , standard dccd v3 box
For every one that runs sweet at 350+ there are a handful parked up with broken engines and gear boxes.
Old 16 July 2012, 01:14 PM
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Originally Posted by MattyB1983
I wouldn't want to push a standard 15 year old Impreza engine anywhere above 330bhp, unless ofcourse you can afford to fix it 'when' it decides it's had enough.
That's the critical point that many people forget.
These engines cost £3000 for a decent rebuild.
Once they go, there is no turning back.

My old V4 sti ran fine with me for 20k. It was running around 310bhp (standard but with a decat exhaust) on standard map. I sold it with around 70k on the clock. It ran find until the new owner fitted a bigger turbo/injectors/new ecu/front mount etc.
Within a week it spun a shell.
So he spent £3000 'improving' it, then it went bang.

Be very careful.
On the road, these cars are fast enough in standard form.
It's only ***** wavers down the pub that feel the need to spunk a few thousand on the credit card, just so that they can be noticed just that little bit more!

I'll get me coat!
Old 16 July 2012, 01:22 PM
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Originally Posted by Gear Head
That's the critical point that many people forget.
These engines cost £3000 for a decent rebuild.
Once they go, there is no turning back.

My old V4 sti ran fine with me for 20k. It was running around 310bhp (standard but with a decat exhaust) on standard map. I sold it with around 70k on the clock. It ran find until the new owner fitted a bigger turbo/injectors/new ecu/front mount etc.
Within a week it spun a shell.
So he spent £3000 'improving' it, then it went bang.

Be very careful.
On the road, these cars are fast enough in standard form.
It's only ***** wavers down the pub that feel the need to spunk a few thousand on the credit card, just so that they can be noticed just that little bit more!

I'll get me coat!

Old 16 July 2012, 01:31 PM
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Originally Posted by 99greenwagon
it would be a very good upgrade,ive got a afp20g for sale if interested,its in for sale section.
Yes I no that's why I'm asking on here if it's worth my while
Old 16 July 2012, 01:34 PM
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Originally Posted by 99greenwagon
...ive got a afp20g for sale...
99gw, you not going for c.400bhp now?!

Last edited by joz8968; 16 July 2012 at 01:36 PM.
Old 16 July 2012, 01:39 PM
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Originally Posted by joz8968
99gw, you not going for c.400bhp now?!
He's gone billet instead chap.
Old 16 July 2012, 01:41 PM
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Originally Posted by Gear Head
That's the critical point that many people forget.
These engines cost £3000 for a decent rebuild.
Once they go, there is no turning back.

My old V4 sti ran fine with me for 20k. It was running around 310bhp (standard but with a decat exhaust) on standard map. I sold it with around 70k on the clock. It ran find until the new owner fitted a bigger turbo/injectors/new ecu/front mount etc.
Within a week it spun a shell.
So he spent £3000 'improving' it, then it went bang.

Be very careful.
On the road, these cars are fast enough in standard form.
It's only ***** wavers down the pub that feel the need to spunk a few thousand on the credit card, just so that they can be noticed just that little bit more!

I'll get me coat!

And the bill

My engine my be 15years old but it's only done 17000 miles and it already has 550injectors FPR billet rails braided parrell lines large front mount full RCM decat cold air system vf35 I only use this for track I drive there race and drive back I have blown 1box to bits but I no that one had done 135000miles I now have a built stronger 5speed with a curso front diff it's great the thinking behind this up grade is a fast spool and maybe a bit more hp to wave my willie at
Old 16 July 2012, 01:41 PM
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Originally Posted by MattyB1983
He's gone billet instead chap.
Oh, he's REPLACED THE AFP20g with a SC40 Billet?

If so, good lad.
Old 16 July 2012, 01:42 PM
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Originally Posted by johnnybon
Yes I no that's why I'm asking on here if it's worth my while
You would be asking for trouble bolting a 20G onto a standard V4 engine unless you ran it with **** all boost, but then there's no point.

Spend the money improving your car in other areas. A great brake and suspension setup is worth more than the 50bhp a 20G will give you.
Old 16 July 2012, 01:43 PM
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Originally Posted by joz8968
Oh, he's REPLACED THE AFP20g with a SC40 Billet?

If so, good lad.
20G billet I believe
Old 16 July 2012, 01:43 PM
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Originally Posted by 99greenwagon
it would be a very good upgrade,ive got a afp20g for sale if interested,its in for sale section.
Also what is you spec on your engine hp internals ect ect
Old 16 July 2012, 01:50 PM
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Originally Posted by MattyB1983
20G billet I believe
Old 16 July 2012, 01:54 PM
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Originally Posted by johnnybon
Also what is you spec on your engine hp internals ect ect
i have a v9 jdm sti short motor.
Old 16 July 2012, 01:54 PM
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Originally Posted by MattyB1983
You would be asking for trouble bolting a 20G onto a standard V4 engine unless you ran it with **** all boost, but then there's no point.

Spend the money improving your car in other areas. A great brake and suspension setup is worth more than the 50bhp a 20G will give you.

I have tein super street suspension whiteline through out fully adjustable rear lat bars porche gt3rs front breaks on the back brembos toyo 888 carbon bonnet full cage cobra buckets 5point harnes I'm going to set about it with a grinder soon now the fat b-----d who drives it is30kg lighter
Old 16 July 2012, 02:02 PM
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Oh yes I have a engine tuner forged 20short block on the shelf in the garage but I have another 2 door shell waiting for that
Old 16 July 2012, 02:07 PM
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Originally Posted by johnnybon
Oh yes I have a engine tuner forged 20short block on the shelf in the garage but I have another 2 door shell waiting for that
its got 20g written all over it.
Old 16 July 2012, 02:11 PM
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Originally Posted by 99greenwagon
its got 20g written all over it.
What a great salesman no the forged engine going to have a 30 g rotated on it
Old 16 July 2012, 02:12 PM
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Originally Posted by 99greenwagon
i have a v9 jdm sti short motor.
1) Get a 6-sp.
2) Change the 20g billet for a SC42 billet (with the 7cm^2 exh. housing).
3) Go mental!
4) Get 2 maps on your Simtek: V-P only... and V-P + 20% meth
5) Go mental!


Last edited by joz8968; 16 July 2012 at 02:14 PM.
Old 16 July 2012, 02:12 PM
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Originally Posted by johnnybon
What a great salesman no the forged engine going to have a 30 g rotated on it
that will be a rocket!
Old 16 July 2012, 02:14 PM
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Originally Posted by joz8968
1) Get a 6-sp.
2) Change the 20g billet for a SC42 billet (with the 7cm^2 exh. housing).
3) Go mental!

1. ive got a ty754vb1ca v6 dccd box to go in.
2.in not going six speed.
3.it will be mental enough in a type r.


oh and ....
4. change your plugs!
Old 16 July 2012, 02:17 PM
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Originally Posted by 99greenwagon
that will be a rocket!
That's the plan if it all goes well should be 1100kg and around 600 willie wagging HP got a set of Rota's 18/10 with et20 with 265/35/18 r888 just hope I see it to the end it will be great track monster


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