Just wondering if anybody has used the standard Sti up pipe with this turbo?

I had my car mapped recently with this turbo, but to be honest I've begun to miss the spool of vf35 I took off and sold.

The car begins to spool at 3500rpm, then goes at 4k.

She only made 397bhp (camshaft position sensor failed straight after the map, dont know if this had a bearing on the low bhp), and 391lbft torque, but doesnt really seem that much faster, not sure if the turbo upgrade was worth it now.

I have the Harvey up pipe made for the 321t, but wondering if a standard one would give earlier spool?

Current mods are: (widetrack blob)

panel filter (induction kit to be fitted soon)
fuel pump
800cc injectors,
ported headers
Harvey up pipe,
prodrive sports cat (could this be a problem?)
2.5" center with Tsl group N back box
321T with billet wheel
samco induction hose

All experience and opinions greatfully recieved

Ps does anybody know how to edit a thread title, made a stupid spelling error

 

Uppipe wise you wont get better than Harvey`s

 

Harvey reckoned his ported exhaust manifold and up pipe were good to 400bhp, then you needed to look at a GT spec gen 2 manifold. With your current spec 397bhp is pretty good, and the T will blow the socks of the V35 all day long.

 

The panel filter and the prodrive sportscat if in the downpipe would be restrictive on that turbo. A big K&N filter either in wing or engine bay would be better. I have a 3" Miltek with sportscat in downpipe but the cat is 100cel and isn't restrictive.
Trev

 

Are you honestly saying a 321t isn't much faster than a 35. Something has gotta be wrong. 400 isn't a good result on a t btw.
H is 400 and t is 450 afaik

 

What downpipe btw and as said you need GT headers

 

A billet T is very unlikely ever going to spool up like the vf35.

You just have to alter your driving stlye a bit to accomendate the upper power band. A less restrictive down pipe will help and you can't get better than a Harvey up pipe.

For day to day driving the vf35 is very hard to beat with the response but a billet T will blow it away on a faster drive or track.

 

The Harvey ported up pipe and his 'trick' up pipe are quite different, the latter an ideal match for a Gen 2 manifold.

 

I'd like to hear some more details about this magical trick up pipe. Whats so special about it, everyone raves on here about them but has anyone gone from say a gt-spec up pipe to a harvey one ??
What exactly makes them so special ?

I originally had a VF28 turbo and standard manifold and up pipe which is known to be a super fast spooling setup. I then swapped this for a big 'laggy' 20G turbo and laterals GT spec manifold and up-pipe ( http://lateralperformance.co.uk/prod...af32934dc3971f ) and believe it or not the 20G spooled quicker than the previous setup.

From people I've spoken to who have the harvey trick up pipe and have seen massive improvement have come from a standard up-pipe so its obviously going to see an improvement.

 

Thanks for the replies, I was going to ask about the 20g, a freinf claims his billet 20g spools at 2.5k rpm, I was always told it was a laggy turbo

Could be lying though, havent been in his car and hes quite competitive.

Would have thought a smaller diameter up pipe would aid spool? The "trick" pipe I have has a bigger diameter than the standard one.

 

Got RCM GT SPEC HEADERS AND RCM VENTURI UP PIOE FOR SALE if interested

Ryan

 

So out of curiosity, when would the trick up pipe start being restrictive and the GT one be better suited to a car with a GT exhaust manifold.

 

More to the point, whats so 'trick' about it ???
Its a metal tube surely ?

Genuinely interested to hear from Alyn who now produces these to learn about what makes these up-pipes so good.

 

Also the 2.5" centre may not be helping, i was informed they are happy up to around the 400 marker but can become restrictive much after that marker. Don't get me wrong others out there are running over 400 on a 2.5" exhaust, it's just a suggestion

 

FMIC?

 

Thats exactly what mine is, no venturi or anything inside it, but it does have a slight taper, may be its this that is meant to help with spool.

 

I have considered moving up to a 3", but was advised a 2.5" will help keep the torque figure up.

Is it normal for this turbo to not start spooling till 3.5k?

It does go well after 4k.

 

It can depend on the given car and setup as not every motor will respond the same way as the next one with exact same spec as crazy as that may sound I would say circa 3500 you should be coming on strong and off you go, I'm sure I've seen a couple spool slightly quicker on the graphs, threads and projects I've read but it's on the money. Just remember the size of that turbo compared to a standard vf35. They are on boost at circa 3200rpm, again some may be slightly earlier / later so given the size difference in turbos a 300 rpm trade off in spool is to be expected