BlueBugEye

iTrader: (12)

OK I currently have a set of Harvey ported headers and up pipe attached to my forged 2.5 and APS SR40 turbo maxed out at 405BHP.

I'm looking to swap the turbo for either an SC46 or MD321t going for 450/450 or thereabouts.

Question 1 - will the ported headers flow this or will I be better off going tubular?

Question 2 - will I need a different Up-Pipe if I stick with the Ported Headers?

alcazar

iTrader: (2)

I can sort of answer the first question. When I worked with Harvey on the spec of mine, (well, listened to Harvey, would be closer), he told me that turbos that flow bigger need tubular headers, which is what I have.

Can't answer the second question, and afaik, Harvey is still unwell.

BlueBugEye

iTrader: (12)

What's the max BHP people have managed from ported headers plus - does anybody in the UK make an uprated link pipe like the Grimmspeed one?

MartynJ

If you want the best out of either of those turbos, the ideal solution is RCM headers with Harveys special uppipe. They work a treat giving an excellent balance of spool vs outright power.

Martyn

dunx

iTrader: (3)

A friend has just swapped ported OEM to tubular and gained 20 bhp...

dunx

P.S. Pushing out over 400 bhp now

harvey

iTrader: (48)

Firstly if people are definately going the other side of 400 bhp I advise on RCM 3 bolt headers which I supply with my special 3 bolt uppipe.
Secondly, there are lots of examples with ported headers and matched uppipe in the 400 to 430 bhp but I still stick with the information above because I know you can pick up power and particularly torque with the combination in para 1. We actually have at least two cars on ported headers and matched uppipe in the 430-445 bracket.
Without doubt I use ported headers up to and sometimes beyond 18G.
20G is a fine decision as is 321H. By SC46 and MD321T it is a no brainer.

OK you are 2.5 and you need to flow more air than a 2 litre.
Absolutely without doubt you will be better with tubular 3 bolt header set and with my special uppipe properly mapped there will be no lag on a 2.5.
Fitting these headers (which I supply) without the special uppipe and you may have a bit of lag, spool will definately be later and you will have less torque mid range but no difference in ultimate bhp.

As many mappers can tell you, Martyn included, our uppipe makes a specatcular difference particularly on 2 litres fitted with turbos that are too big for normal town work. Do not fit the uppipe without a remap because the difference it makes can easily take your engine beyond the scope of your previous map.

__________________

BlueBugEye

iTrader: (12)

Cheers Harvey, looks like I need to add a bit to the turbo budget and get the headers done at the same time then! What would I be looking at for the headers and uppipe?

Terminator X

iTrader: (7)

I have this + MD321t & got 447hp on the rollers.

TX.

dunx

iTrader: (3)

Hi Harvey, AET GT3076 std. fit turbo going on a 2.1 stroker, GT Spec/RCM three bolt headers, what would you advise for the up-pipe with new header/up-pipe gasket, and a price to supply please.

Regards,

dunx

harvey

iTrader: (48)

TX: I am sure you have a fast responsive car there

Dunx: GT3076 and 2.1.
BBE:
Guys, we have not supplied a special 3 bolt uppipe to anyone that has not found immediate improvement in response, spool and mid range torque and your experience will be no different.
I supply the 3 bolt headers £430. These come with the useless uppipe that slugs spool because of its poor design and also the gasket. The gasket on its own is very expensive and a rip off at £14.50 so do not buy one needlessly.
3 bolt header set £430.
DEI heat wrapping if required £105.
Special uppipe which comes DEI heat wrapped with 5 new Subaru studs £149.
You can ask any mapper with experience of my uppipe as to its worth or any one who has fitted it and it would be particularly useful if you can find someone who fitted it after first having the originally supplied uppipe.
Come back if I can give you more information.

dunx

iTrader: (3)

Sorry Harvey,
I was a bit slack, can you supply a replacement header to up-pipe gasket plus replacement bolts & nuts with the up-pipe ?

dunx

P.S. Apologies to the O.P. !

harvey

iTrader: (48)

Sure thing. Gasket you know £14.50. Uppipe £149 and if I can find some second hand bolts in VGC you can have them FOC otherwise new ones are about £3.60 for 3 x nut and bolt set. Delivery for the lot £12.50.

biggazvr6

iTrader: (8)

Harvey, I'm intrigued by the info above on your up pipes. On my 321t I see a just over a bar of boost@ 3000rpm and full boost at 4100rpm. What could I expect to see from one of your pipes? Cheers. Gaz

harvey

iTrader: (48)

Gaz: That is an impossible question to answer but nobody that has ever fitted one of my special uppipes has been disappointed with the results and they have always reported improvements over and above the standard uppipe supplied. Ask a few mappers or owners on here as to their experience.
I assume you are a 2.5. Full boost at 4100 sounds rather late. I have noticed the 321T does not spool as well as the SC46.

Terminator X

iTrader: (7)

What's the rest of your spec Gaz?

TX.

biggazvr6

iTrader: (8)

Forged 2.5 scdb, recon/rebuilt v5 sti heads, parallel fuel lines, fuel lab fpr, lateral modified phase 2 inj, walbro gsl 392 pump, gt spec headers and up
Pipe, full 3.5" system, md321t

harvey

iTrader: (48)

Good gains to be had. Come to Darlington and we fit my uppipe. If you do not like it we take it off and put your old one on and no money changes hands.
We can clock some before and after times with a stop watch and 1800-6000 rpm runs in 4th gear on the same level piece of road.
You do need a remap and that will show further gains.

Arby

hi im new to scoobies i have a 96 jap sti my up pipe cracked recently so i replaced my up pipe with a stainless one and a stainless tubular manifold at the same time. being totally unaware of this

my car has a simtek ecu airfilter and the full stainless system (manifold, downpipe etc)

after fitting this the car developed a miss a few days later after a week missing it died.

living in guernsey i cant take it to a mapper easy so many thanks to martyn i have an ecu on the way so i can try and find the problem using the diagnostics but reading this im worried i could of damaged my engine

the car restarted a few times running rough trying to die on idle but if u reved it it cleared and the motor sounded sweet im hoping its a minor electrical problem that can be diagnosed and fixed easily but reading this im starting to think otherwise

harvey

iTrader: (48)

This refers specifically to my special 3 bolt uppipe replacing the solid OE uppipe supplied with the GT2 header sets.
However, generally you should not go from original equipment headers (cast) to tubular headers because the difference it makes is quite significant and if the headers do their job properly, or the uppipe, your engine needs more fuel.
The map for my headers will require more fuel earlier and fuel across the rev range because of the additional power developed from this specialised uppipe.

biggazvr6

iTrader: (8)

Any pics of the up pipe harvey?
I'm going rotated in winter so would your pipe be able to be altered to suit or would it be a waste of money if it is so specialised, I.e would I loose any benifit from it if I chop it up to make it fit?

Cheers bud,

Gaz

harvey

iTrader: (48)

I do not make the Special Three Bolt uppipe for anything other than conventional position turbos.
Twisted turbos are very few and far between and to manufacture a special uppipe I would need the car here for two or three days, it would be a one off, the first one would take a lot of time and even subsidising it, it would be expensive.
If I ever fit my new GT30 with a twisted kit I may come up with an improved twisted kit and purpose designed uppipe but that will not happen in the near future. I have already examined a couple of twisted kits and can see where improvements can be made but unless these things can be made in quantity to offset the set up and jig costs it is a non starter and the market is very small.