Ok so I have a blob sti which I became disillusioned with but after some thought I'm keeping for the long haul after already ploughing much money into it,

Most of my money has been spent on brakes and suspension components, the car feels great, handles just the way I want it,

It seems I'm getting the bug for a bit more umphh, I'm not chasing huge figures and don't want to compromise the reliability of the car but feel I want a bit more, anything now will be done with a sensible budget, with this in mind I'm a bit reluctant to spend big on turbos etc unless any reasonable deals on used parts come available,

It's only a weekend toy with the occasional track day participated,

With this in mind the is the
Current spec of engine etc:

3" turbo back exhaust
3 port solenoid
K&N panel filter
Walbro 255 fuel pump
Forge recirculating DV

Mapped to about circa 340bhp/330lb ft

pretty standard really,
Would I gain much from a FMIC for instants, not just from power gains but cooling to, different headers?

I'm a bit unsure as you can see so any suggestions would be great

Cheers

 

not really at that power, to get a decent power hike is going to involve a new turbo as the vf35 is nearing its limit

 

Any more decent power is going to cost money unfortunately!!

Could probably put a VF43 turbo from a hawk sti, you would probably gain more bhp/lb ft but you would lose lower down spool as its a slightly bigger turbo

 

yep, your at the limit mate. you could look at getting headers done which shoudl help with peak a tad and beeter spool, but beyond that your at the limit wiothout looking at turbo as mentioned above.

 

Didn't somebody get over 380 bhp from a vf34 allegedly? I'm sure there was a lengthy thread about it posted by Big D iirc.

 

wasnt there somethign funny about the dyno graphs though? or am i thinkign of another thread?

 

Sorry to say mate but at the power level you are at now,the next stage of mods to get a reasonable power increase is going to cost.You are looking at a Turbo change bigger injectors = another map etc...it can still be done though quite cheaply by sourcing good quality second hand parts off of here or the bay of e.SJ.

 

There was, a lot of dispute from what I remember. The late Harvey Smith was far from convinced.

 

yeah, RIP

 

 

hahaha

 

Micky, was it you that did that other graph? the one which resulted in a lot of spat out coffee

 

 

What this one?



I thought 470 from a VF34 was a bit optomistic, so refined my skills a bit.

Whatever power you want, I can do a graph for. Probably the same as some rolling roads can do, only cheaper.

 

How about an sc38/rcm400 turbo? Surely pink injectors will be fine up to 400bhp

 

You could probaby acheive around 400-450hp reliably. If you are looking for the lower end of that figure then I would say source a VF43/48 which will reach near that figure with supporting mods i.e. ported headers and a meth mix. However these turbos suit the 2.5 better and therefore you will lose some lower end spool which the 2.5 can counteract. I would go for a used SC40/42, MD321, etc which will perform a lot better and can acheive higher figures. You will also need bigger injectors such as 650cc at least, 750cc ideally. You may need a bigger fuel pump such as a 290lph but I am not a 100% certain. Top mount and panel filter should be sufficient for these figures.

Regards,

Subaru Collector 555.

 

Trouble is SC40/42 used is going to cost £800-900 for lets say supposedly 400-420bhp, VF43/48 used £250-350 for 360-380bhp, is it really worth extra £500 for a turbo for 40bhp-ish.

And with the SC40/42 can the original injectors be used??? Pretty sure you could get away with the standard injectors using the VF43/48, but then again with what ever turbo you going to use the car will need re-mapping so thats another £300-500(what ever the charge) so can cost anything upto £1000 for that extra bhp. and the OP doesnt want the hugh expense by the sounds of it, so best to leave what you got!!!

 

Thanks for the input guys, with that in mind I will bide my time and wait for good used parts, I thought this would be the case regarding the turbo, I'm not in a rush to buy parts so will accumulate over time, I have seen turbos for sale on here before but seem to sell as soon as they go up for sale

 

True. Another route could be a TD05-20g as they are a lot cheaper and are able to withstand 400-420hp with simple bolt ons.

Regards,

Subaru Collector 555.

 

I'd speak to Braveheart Sti and see what he can do with your existing turbo, ie billet wheel and bigger exhaust housing, then look into a matched Harvey up pipe and possibly ported std headers, I wouldn't go after market headers because of your track usage and power aims as cheap ones are known to crack.

Forget about front mounts as heat soak isn't going to be an issue on track or week end blasts and your top mount is good for 450bhp, spend that money on an oil cooler and exhaust wrap.

I'd also put the car on a diet and try to lose some weight out of it, back seats and seat belts, spare wheel, jack, speakers, stereo, air con, "C" section and rear spoiler all adds up to nigh on 70kg.

I don't know what your standard injectors max out at but you could fit an fpr to give you a little more head room or pick up a set off here and sell yours on.

Map tweaks are only £150 so that's not a major issue.

Another 40/50bhp and 70kg less should keep you entertained for a while.

 

Top mount isn't good for 450 bhp, 400 tops

 

oppp's getting my air boxes and top mounts confused. but point being saving money and directing it where it's needed more ie oil cooler.

 

And there is of course one other way to gain power and save money.

20% METH.

 

rubbish.........

http://midlandscoobies.invisionzone....opic=34148&hl=

 

Cheers matt, I thought as much but it was early.

Tubbs, Google is your friend.

 

Have a look at Andy's site, honest and accurate advice from one of the best....

http://www.andyforrestperformance.co.uk/index2.html

 

Have a look at Andy's site, honest and accurate advice from one of the best....

http://www.andyforrestperformance.co.uk/index2.html

 

Got too remember when people say 400 on a top mount
That's because it's the figure when things start getting interesting & engine dynamics take a hold . Ov course more has been achieved , but individuals who push to achieve also give the engine everything it needs in terms of fuel , air & spark .

It's just the industry norm to say 400 let's move on & up .
Is anyone goin to notice the diff from 390-410 spanking it down a motorway . ?

 

I think you need about a 50bhp increase to get a "noticeable" difference from the op's perspective, with it already being modded and mapped.

I personally wouldn't want to go much beyond 380bhp with a standard engine that's going to see the track and be driven hard all day.

I'd also say your 3 essentials are baffled sump, oil cooler and swirl pot.

 

Some interesting views, thanks for the replys, if not a little more confused now,
Suprised with the comments about the FMIC,
would of thought with the position it's located it will only be more beneficial from an efficiency point of view not just for power gains