Want to pick the minds of scoobynet.
I have a 2004 STi engine which is virtually standard barring an air filter, straight through exhaust ie no silencers or cats, a bosch 044 fuel pump and a remap.
Currently around the 330bhp mark but looking for more power.
If I were to change my turbo to an SC 46 and installed a set of 1000cc injectors what sort of power could I expect after a remap?

Thanks in advance Ian.

 

1000cc injectors is a bit of an overkill for a standard bottom end I would proberly go with 650cc or 725cc injectors with maybe an uprated FPR plus the SC46 I would think would be a bit more laggy down the power band on the standard engine,maybe a SC42 would most propberly be the biggest turbo I would personally feel safe running with the standard bottom end.SJ.

 

Thanks for the input, I suggested 1000's as the price difference is hardly noticable and with them I'd be safe for any future mods, they idles amazingly on starlets and similar but very open to suggestions.
If I went for an SC42 and maxed that out to the 420bhp mark would I likely need anything else to get to that sort of power?

Cheers Ian.

 

I've seen sc42's pull way past 420. My previous sc46 hit almost 500 with a bit of help. Was running 3inch decat exhaust, GT Spec Headers, 800cc injectors, FPR and an STI9 JDM block on a simtec ecu plus a few minor parts like 3 port

 

Ian what you have to do is decide how much power you want to achieve and go from there the only reason I suggested the smaller injector was that 1000cc injectors are a 600+ bhp injector but your right in saying that if you have future plans of big bhp it's best to accommodate with an injector that can already produce the goods as there not cheap.SJ.

 

Wow didn't realise they would do so well.
I have a 3 port too so that's something else ticked off. Oh and will also change the intake pipe.
Guessing an FPR wouldn't be needed if I went for 1000's?
Are the stock fuel rails good for 450bhp?

 

Thanks again, 1000cc injector dynamic injectors can be had for £450 so not bad in my opinion amd they have a great reputation in other scenes just not too big in the subaru world I don't think.

 

It can be done on the standard rails but I think if your looking to do it properly I would go for a set of billet fuel rails and do the parallel set up.SJ.

 

I just checked out the dynamic injector website they don't look to bad at all I have power enterprise in mine that have been faultless over the years.SJ.

 

I am running 400 bhp on the following.

Standard sti 8 engine.
GT headers
Full 3" de-cat
Induction kit
850 injectors, suitable for nearly 600bhp
SC42 billet turbo (1.45 boost)

Limited by the Top mount intercooler and the standard ECU

 

How do you find it Bob? Laggy? I've been looking at having an SC42 on my new build but I'm after out and out spool with up to 400bhp really.

 

Charge cooling isn't an issue I have that sorted, and I'm currently running an opensource map, think its the carberry rom so running mafless. How is the ecu holding you back?
Cheers Ian.

 

Also what level do the standard headers start holding things back?

 

Also what level do the standard headers start holding things back?

 

Mate I'm on an SC42 and Alcatek making 439/385 on V-Power; going for a 3 bar map sensor with JGM soon, along with an RCM induction kit and hope to make another 10-15 extra if we're lucky but that'll be it for me.
For the spec see my garage, but I don't have parallel rails or an uprated FPR and the car runs just fine and has been faultless for nearly a year in this spec.
It's something I honestly haven't considered up until now but might look into it.

Standard headers will start to hold you back in the late 300's; swap them and expect to lose a little spool in exchange for more torque and top end. For an everyday roadcar I don't want more speed tbh; bit better spool might be nice but the car is definitely fast enough for what I want, still frightens me on occasion

 

Standard ecu is mapped using ecutek with a maimum boost of 1.55 bar but most mappers will not exceed 1.45, if I want more boost I would have to change the ecu.

I am running 2 port solenoid and standard fpr but with the ppp walbro fuel pump. I'm on good solid boost at 3500 and a case of hanging on all the way to the red line with max bhp at 6800. The spool point is now the same as the oem turbo that was fitted, the billet wheel helped but gained 500rpm when it was de-catted.

 

Won't the top mount inter cooler limit you to around 400hp? But an sc42 would be a good choice of turbo

 

As mentioned earlier, the tmic is maxed out at 400bhp using the sc42 but the op has that side sorted.

 

[QUOTE=Bob99;11242213]Standard ecu is mapped using ecutek with a maimum boost of 1.55 bar but most mappers will not exceed 1.45, if I want more boost I would have to change the ecu.


not sure about ecutek,but i know for a fact that open source remap with a different map sensor and boost can deffo be increased.im running a hawk map sensor in a classic with a sti8 engine hydrid gt30 400bhp and peak boost of 1.7

 

[QUOTE=wrx0211;11242277]I made 412 on ECUTek with a dodgy Viper inlet hose. Changed to Perrin hose and Alcatek and made 432. After an exhaust change 439.
Good figures can be achieved with ECUTek - the problem is when it reigns in the power and then doesn't give it back without an ECU reset; the Alcatek doesn't have that problem.