"I already have 2 UK turbos around the mid 300s. I hope to be joining Alan G and John Banks later this year with a 400+ bhp UK car still on the standard internals."

Let me know how you get on with that !! if it can be done I'd be well interested on how to go about it, as I doing this blindfolded with the STI-8 as know one wants to let anything out the bag or genuinely knows nothing about it. Is it that much different from the STI-7

 

There isn't that much more to it on the UK/JDM - those figures are for the UK with 95 RON & the JDM 102 RON. Run them both on 97 & the UK comes up to 225-230 & the JDM down to 250ish. Most of the 'big power has to come from JDMs' has recently been disproved rather well, I think, with the overall outcome being that it's simply much easier to get a JDM to explode.

 

Mad Scientist,

LOL. I suppose so. Maybe that's why I take risks that some others don't. I always have backup.

Midnight racer,

The specs on my cars are as follows (and in case you are wondering, I'm not a lottery winner - I bought one and inherited the other):

96 and 97 UK turbos

Both have uprated fuel pumps (96 has reg too).
Both have Blitz SUS induction.
Both have HKS Boost controllers.
Both have Knocklinks, Lambdalinks & EGT gauges.
Both have MRT lightened pulleys.
Both have TD05 turbos (97 version is front entry though)(96 will soon have TD05/06 front entry hybrid).
96 has HKS FMIC, 97 has uprated MRT TMIC and Samcos.
97 has MRT silicone inlet hose.
96 has 550 injectors and a Link ECU, 97 has OEM injectors and ECU
97 has HKS FCD
96 has full 3" decat with HKS headers and stainless uppipe
97 has full 2.5" decat
96 has a lightened flywheel

(I think that's everything)

CTR Nutter,

I'll let you know how I get on, but with an STi7/8 the route will be somewhat different and probably a lot cheaper and safer.

 

Quote :- It's torque that you feel. BHP is just pub talk.

I don't agree

Though torque is what makes a car accelerate, its the torque at the wheels.

A car with higher BHP but the same peak torque (and therfore generating it at higher RPM) will tend to accelerate quicker as it will hold a lower gear for longer and therfore develop more torque at the wheel for a given road speed.

As too much torque is what damages clutches/gearboxes/diffs increasing RPM range and extending the torque curve is worthwile.

 

Even for an engine that was specifically designed for high torque at low rpm?

 

Good point on the torque breaking gearboxes/clutches etc.

You may want to consider how the boost comes in on a 350+ bhp scoob, if you bang it in quickly at low rpm you are likely to break things.
Probably better to ramp it up gradually to hold a wide torque curve as the revs increase.

This is against conventional turbo tuning. With smallish OE turbo's such as td04 & td05 you normally have to tail off the boost at high rpm due to the turbo running to its choke line. With a bigger turbo, there is no longer this restriction and you can hold a lower boost figure.....but much higher up the rpm range. This will match the torque of the small turbo at lower rpm (keeping it gearbox friendly) but give much more power as the revs increase resulting in a far faster car.

Andy