RR printout thread.

I wasnt having a god either Steven. Honest.

I believe the closed design is best for this application. Sometimes they get it right.

the turbo is quite close to maximum efficiency and its boosted quite hard as well out of the box. Bigger turbo = bigger gains

 

I know you weren't having a go mate. Sometimes its hard to get a point across on the old tinterweb

Maybe the closed design is best, but slightly modifying it might potentially give free horsepower. The airbox will flow well, but im sure on the couple of bigger powered 250's iv seen they all have cone filters, so a restriction must occur above 320bhp...

The hybrid turbo on the 250 intrigues me and has potential to turn the fast "b"road megane into a straight line animal aswell!

 

The 250 runs a 15t turbo as standard. Do you mean adding a larger turbo to the meg 250 than the standard one ?

 

Yeah mate, fitting td04hl 19 or 20T cartridge, with the correct billet compressor wheel look interesting.
With correct mods 350-360bhp seems achieveable.

 

I would go for the 20t and a few minor tweaks. Should easily crack 360bhp with that !

My r26 is running its current power on 1.2 bar , and 60% wastegate duty using a 250s 15t.

 

When Paul was in Slo we tested the standard airbox on a hybrid 265.When we opened the airbox we gain 18 Hp.Therfoare I'm sure it restrict the flow somehow.

On the other hand I have modified mine and it is flowing 420 no problem.



This is how I have moded the outlet, the inlet is fited with 90 mm velocity stack

 

How did you mod it ?

The one I know about ( and know the owner ) was a standard car and it made 1nhp more and dropped a shed load of MPG.

 

Cut the OEM outlet, dremel it out as much as you can than fit the 3" pipe with suport brackets.At the and fill with silicone to sill it.
Same on the inlet.Cut the pipe dremel to fit the velocity stack.

 

Nice one Sokol. I might have guessed you and your friends would have modified one

18bhp is a amazing gain for very little £££

 

Good mod, is this on a 250 or R26, would it have the same/similar with an R26,
cheers
steve

 

Its on the 250/265 Steve.

The mod should be done in an identical way on the r26. Not just cut a sodding great hole.

 

The airbox I have posted is from my 225.Air box on 250 are a littly differend.The outlet and inlet are bigger from stock.But looks like they are still restrictive.
@Stevens878
Actualy I'm the only one who have moded the airbox . And especialy the outlet.

 

Please could you pm me a couple of pictures of how to do it myself so I can sort out this big sodding hole ive cut out lol
cheers Steve

 

This is what I did steve.

http://www.rsmegane.com/showthread.php?885-K-Tec-induction-kit-v-Modified-Air-box/page2

 

Ive removed some of the lower grill for the inlet.

 

RS250

BMC panel filter
Scorpion cat back
Airtec FMIC
Stage 1 RST map.

 

I can never makes sense of these charts....can someone explain what we're looking at?

 

The red is before the green is after.

The curves that start low and peak with a little tail off at the end are the HP with the scale on the left

The torque curves are the flatter ones that start high and end low.

 

Excuse my use of paint !

 

You basically have 4 elements on the graph
Torque before
Torque After
Power ( hp ) before
Power ( hp ) after

2 of the 4 are known.

Identify the power before by using the left hand side Y axis and find roughly 271 bhp , follow it across. Thats your power line . 1 of 4 identified.
Do the same on the 313 bhp one. There you go. Item 2 .

That leaves the torque. As these are colour coded plots ( red before / green after ) you can see the torque before and after .

The idea is that the mapper creates a lot of space below the line for a smooth progressive ride. If something like a huge turbo is used the map plot will change. Let me find some.

 

Progressive smallish turbo

 

This one is flat as a pancake till the turbo gets going

 

Is it odd I looked at that and thought "bet that's something silly like a Supra", checked the image name.... yup Supra.



I need to get out more.

 

why does the meg's start to lose torque after 4000rpm? does the turbo not flow enough air to keep the boost?

 

Is that the standard 250 turbo?

 

I suspect so yes.

TD0415t