I think you are correct.. I couldnt get his car to hold boost, compare it to the graph I just posted of another car it held boost higher up the rpm range.. I think the actuators deteriate very quickly..

I consider an uprated actuator a good move.

Simon

 

personally I dont charge extra for using megarom.. its just starting from a different rom file when you begin.. it takes extra time playing with in gear stuff etc but worth it.

Simon

 

That graph looks awesome for a VF36
I would imagine its holding over 1.5 bar from 3500rpm to 5000rpm! This must really help it achieve its 360bhp. How did you manage to stop the boost dropping off sooner & hence not lose any hp further along the rev range? Do you think it was more the actuator holding boost or to do with the boost cut levels you set? (I would imagine car is only going to do what it wants to do regardless of the upper boost limit set?). I also wonder what aftermarket actuator Nic was using as I have heard the odd negative comment with the Forge actuator (blue spring) I am currently using.
Thanks for your input Simon

 

that was the standard actuator.. however it was nearly new..

no it ran something like 1.5bar tailing to 1.1bar at redline iirc.. if I remember when I am next back at surrey rr I will pull the boost plot up for nics car.

You set a target boost and an amount of duty for the boost solenoid to bleed air off but if the wastegate actuator cannot hold the wastegate shut then it matters not..

I am not a fan of the forge dumpvalve, well thats unfair I am not a fan of any after market dumpvalve.. either no dumpvalve or oe is best.. however the forge wastegates work quite well and being able to change the springs is good etc..

Simon

 

Thanks Simon

ps I see you are a fellow insomniac like myself!

 

way past your bedtime Ricky
or is it at your age you need to get up for a pee in the night

 

Very, very valuable info. The steep torque curve would impress my mates, but i think i would prefer a wider band. I would want to improve spool up and make the drive more effortless than it is right now in stock form. I'll have to talk with my mapper about it.

Okay. Mapping will also show the condition of those parts. I live in Nordic Europe so i think JGM is pretty far from where i'm located. I'm sure i could get the best map there.

Hehe. Actually -15 often feels colder than -35. Might sound weird but the ambient humidity makes the trick. The weather is so dry when the ambient pressure is high and temperatures go lower down to such cold temperatures.

Hehe, i hope that you are talking about Swedish girls. Since i love them even though i'm Finnish.

Thank you for the compliments. I have strong passion for anything related to technology. This is my second Subaru actually, i kind of liked my winter beater Impreza STI Type-R Ver. IV few years back. It was a solid car, it just felt a little old for me, being a 1997.

Yeah, that is what i thought of too. I upgrade my actuator to the Forge and replace the solenoid so boost control should be fine.

Hmm. Sounds great. I assume you can map each gear for own kind of torque and power delivery? That is genious. 1-2-3 gear could have wider bands since they are short geared, and 4-5-6 could have just a little more peakier torque curves to improve overtakes and mid rpm range. That is just what i would want it to be.

How you can improve your spool up by mapping? How much does the solenoid and the map itself affect the spool up? Of course the turbocharger has its physical limits and you are not able to change its efficiency islands, but can i expect a little better spool up? I think it could have a little better spool up in stock form. Of course there are a lot of different things that affect the spooling, but could it be improved in any way with the stock turbine?

 

Thats is actually a very nice curve. I was impressed by the power curve since it only varies by mere 2% in the 5700 - 7000rpm zone. Nice output. Torque is also very nice in between of 3700-5200rpm. It must have been a joy to drive.

 

Heres another one for you to look at with a slight difference, has the ususal wabro fuel pump, K+N Panel filter, 3 port boost solenoid, and 3" cat back exhaust all maped by Paul@ Zen using megarom, only difference to the norm is I run on 15% E85 (mainly due to ease of supply) Don`t think it made much difference to power, but the mid range torque feels quite fierce. Car has done 40,000miles and is on standard actuator and dump valve.

Zen`s rollers:


And just for an interesting comparison, same car, only chages between the two are the switch from E85 pump fuel to E85 from Anglo American Oils. There is no way it`s making that much torque, was quite funny watching the operator poo himself when it tried to climb out of his rollers though

 

Be very careful about concentrating on boost. A lot of people think it's all about boost and nothing else.

I had one map on my car that ran more boost at a given RPM and spooled quicker than my current map, however with the current map the car is quicker on the road / more responsive and also shows a better curve on the dyno (just to be clear - car has never been mapped on a dyno). The only difference was the map...... primarily different parameters for the VVT and ignition timing (and lower boost lol).

This is what sets apart a mapper that knows his potatoes, against another that doesn't!

I don't even worry about boost levels or spool now...... it's how it drives and how it accelerates in-gear that is my comparison!

 

Hello Shaun.

Yes, you are true. I think it doesn't matter what kind of figures you get out as long as you are satisfied on the ride. The mapper is very professional and i'm sure he can map the car just the way i want it. Quicker spool and wider torque band on the lower gears and a little modified in the higher gears.

Just bought the Hayward & Scott downpipe. £228,00 + VAT. The downpipe reduces to 2.5", i guess that is not a problem in my build?

I also found a new Prodrive 3- port solenoid from the Americas, and the Forge actuator from UK. Looking good now.