Turbo Choices for ScoobieWRX

[ScoobieWRX]

We try and do what we can to squeeze that last little bit of bhp from an engine that's been fed by a hairdryer :lol:

It was a choice of run a bit leaner or up the timing a bit so i upped the timing instead because i figure the Turbo is right at the end of what i felt comfortable with and blowing as hard but not as hot as it could without detrimental effect elsewhere. Most of my driving is motorway based so i'd rather have the mid-top end push for overtaking.

Any leaner and i reckon Det would start to become a big problem plus my injectors are not far off 100% even with 3.5-4bar fuel pressure. It's nice and torquey mid range - top end though and will now hit 140leptons in 4th. In 5th it's really hilarious doing 130leptons and then putting your foot down to receive another shove at the back sending the car surging onto and passing the end of the speedo

[Area 52 Autosport]

Our up pipe drops from circa 60 to under 50mm (50mm will easily flow 500hp). The test pipe is not exactly how I want it, but for now it will do for R&D. It will certainly improve spool, by how much we will have to wait and see.

ScoobieWRX, do you have logging/dyno software (and boost/WB/EGT)? You need to find whereabouts you lie within the boost/ign/afr love triangle You may be able to run a little more timing at the expense of boost (for instance). It's quite surprising what can be gained with a little experimentation. Admittedly, what you can do (or gain) with stock like cars is rather limited.

If you have a spare boost gauge try fitting it pre-intercooler. I think you will find the results interesting. We usually run 3 gauges - pre & post IC and the other in the exhaust manifold. Vacuum on the inlet if you want to go all out. They give a great insight into the dynamics of the engine (and respective ancillaries) breathing.

Anyway, lag is easy to overcome... just increase operational rpm - no laptop needed


Jase.

[duncan]

[quote="Area 52 Autosport"]Anyway, lag is easy to overcome... just increase operational rpm - no laptop needed ]

Or keep the turbo spinning

[ScoobieWRX]

[quote="Area 52 Autosport"]Our up pipe drops from circa 60 to under 50mm (50mm will easily flow 500hp). The test pipe is not exactly how I want it, but for now it will do for R&D. It will certainly improve spool, by how much we will have to wait and see.

ScoobieWRX, do you have logging/dyno software (and boost/WB/EGT)? You need to find whereabouts you lie within the boost/ign/afr love triangle You may be able to run a little more timing at the expense of boost (for instance). It's quite surprising what can be gained with a little experimentation. Admittedly, what you can do (or gain) with stock like cars is rather limited.

If you have a spare boost gauge try fitting it pre-intercooler. I think you will find the results interesting. We usually run 3 gauges - pre & post IC and the other in the exhaust manifold. Vacuum on the inlet if you want to go all out. They give a great insight into the dynamics of the engine (and respective ancillaries) breathing.

Anyway, lag is easy to overcome... just increase operational rpm - no laptop needed ]

Hehehe.....I always have my manually operated analog RPM control device ready for action. Never lets me down and always happy to compensate

I would definately be interested in hearing more about the results you get with your uppipe as and when you get more data. Something like that with a 3-bolt flange sounds just like what standard engines need for better spool up off a set of GT Spec headers. If i had bought 2 bolt headers i would probably have kept my Zen Performance uppipe and used that to very good effect. It ran really well on my TD04 and spoolup was really early but petered out between 5500-6000rpm

In the meantime i stick with the larger uppipe and just keep chipping away at the mapping and do plenty of logging. Hot weather doesn't help but then when did it ever on turbo cars. Come the winter i have no doubts boost will be right up there but ultimately the best way to get more power at the stage my engine is at is a bigger turbo and bigger injectors. No 2 ways about it.

I think probably to keep intake temps down i will have to invest in an IC spray and and get one of these methanol injection systems but again it's all about the money.

Thanks for the advice Jase, much appreciated :thumb:

[ScoobieWRX]

Anyway, lag is easy to overcome... just increase operational rpm - no laptop needed ]

Or keep the turbo spinning

.....So long as you have 'Flat Feet' for enhanced shifting!! 8)

[Jamie]

this is a nice thread, because i am also looking for a new turbo.
@scoobiewrx: what injectors do you have?

what happens if you install too big injectors?

[duncan]

this is a nice thread, because i am also looking for a new turbo.
@scoobiewrx: what injectors do you have?

what happens if you install too big injectors?

too big injectors can cause problems with lumpy idle but they have to be really big to do that. Mine are scaled at 850cc and idles a treat.

[ScoobieWRX]

Jamie i have the standard STi 550cc Pink injectors.

I would like some bigger injectors though, perhaps 800cc as i'm almost flowing 100%. I'm a firm believer that if you're going to change something you may as well do a proper job that accomodates future mods without having to make further changes to the same thing again if you're spending money.

However, i have heard of a modification to the STi injector that is suppose to increase flow. The top of the injector has a screen covering the end of the port. The screen controls the fuel flow of the pink injector. Removing the screen apparently results in the injector flowing 720cc.

Sounds like an interesting modification although I don't know how well that works in practice.

Thoughts anyone??

[duncan]

Thats what mine are - modified Pinks.

They flow very nicely thank you

[ScoobieWRX]

Duncan, What is peak flow on your modified pinks at 3bar?