Bigger intake/exhaust or new turbo?

[KevMS6]

My BNR1 looks like its reaching its limit with my current mods, hits 20psi@3000rpm to redline, timing advance 15degree redline which is producing nice power for my mods. Loads are 2.3 reducing to 1.9 redline. No knock and car running well.

I am wondering if it would be worthwhile doing a couple mods to help the turbo out as much as possible and see if I can get a bit more power out of it...

My 3" eBay down pipe bolts to a 2.5" catback exhaust splitting to 2x 2.5" tails to rear boxes... Would upgrading the cat back pipe to 3" up to the spilt give me any gains?

My other thought was to also try out the HTP 3.5" intake to see if I can flow a bit better and increase loads towards redline. Currently flowing 315g/s

What you guys think? Waste of money? Get a proper turbo instead?
I would need to save a load more cash as would need injector seals / install costs etc

Upgrading to 3" from downpipe to the split $150/$180
3.5" intake/battery tray/battery $500

For the money I doubt these 2 mods will provide me with any noticeable gains but any input would be appreciated

[SLOWHATCH]

How much more power are you looking to gain? Proper bolt on turbo set up will still require more mods either way. Larger intake and 3 bar sensor minimum.

[manila]

A larger intake will allow for more flow, thats obvious.

When I switched from a 2.5" to the HTP 3.5" the car drives so much more smoother. I'd say hop on the larger intake, if that doesn't satisfy you, then you can upgrade the snail.

Either way, you're going to need to upgrade the intake eventually.

Hope this helps

[KevMS6]

As much as possible... Another 10-15whp but that's a bit optimistic I think
I was really wanting to see how much I could get out of this turbo before potentially moving on to something bigger & better.

[manila]

@KevMS6; Switch to the AP

[rolanblack]

at this point you pretty much have maxxed out your BNR. every vehicle is different so going with a larger intake may or will not give you more hp. 315g/s is very good! @Smelson; when you upgraded your exhaust, any power gains?

[SLOWHATCH]

Originally Posted by KevMS6 As much as possible... Another 10-15whp but that's a bit optimistic I think I was really wanting to see how much I could get out of this turbo before potentially moving on to something bigger & better.

If your maf is calibrated, 315 gs is great. Doubt you want to run even a medium turbo on stock size maf so just go ahead and upgrade. Just make sure you get both sized couplers so you are ready for bt.

[KevMS6]

Thanks for input so far... I'd love to switch to AP V3 but I've got dashhawk&Versatuner so it's a close second and not worth me switching due to costs.

My highest recorded g/s was 328 when it was much colder but it dropped again once temps increased.

Originally Posted by SLOWHATCH If your maf is calibrated, 315 gs is great. Doubt you want to run even a medium turbo on stock size maf so just go ahead and upgrade. Just make sure you get both sized couplers so you are ready for bt.

Maf cal is good

[BigRedSpecial]

Like already mentioned, you'll need to upgrade your other parts anyway if you go with a bigger turbo so you might as well get them now.

[KevMS6]

Yeah makes sense, I'll upgrade and see how it goes... Cheers

[SLOWHATCH]

Out of curiosity what size nozzle are you running? Also you can run in tank methanol and re-tune.

[Voltwings]

Originally Posted by KevMS6 As much as possible... Another 10-15whp but that's a bit optimistic I think I was really wanting to see how much I could get out of this turbo before potentially moving on to something bigger & better.

even on the handful of stock turbo cars I've tuned with 3.5" intakes they've seen impressive gains, one guy is holding 22 psi out to 5300 rpms lol (beast mode).

As far as your horsepower goals, if you can flow just a little more air up top, even 1 more psi, good for 5-7 WTQ will gain you 10-15 whp. I'd say go with the larger intake, it will definitely help (if you tune for it to do so, meaning running more boost). I also know the Ms3 catback doesn't start becoming a "restriction" until 400+, granted that means getting close to 400 its getting close to being a restriction. An easy way to test would be to simply take your catback off (and monitor carefully!) and see if the additional flow does anything for you.

[KevMS6]

Originally Posted by SLOWHATCH Out of curiosity what size nozzle are you running? Also you can run in tank methanol and re-tune.

It's an aquamist nozzle which is equlivent to a DO6/DO7 - meth running great but I have to get it shipped to me due to remote location so it's quite expensive ($50 for 25litre drum)

I did have a search regarding in tank meth but never went further with it... Is this something that a few guys do?

Thanks Voltwings - I'll get the intake bought, installed and tuned in

[BigRedSpecial]

A few of us are doing in tank... I'm adding around 5L/tank right now.

[SLOWHATCH]

Originally Posted by KevMS6 It's an aquamist nozzle which is equlivent to a DO6/DO7 - meth running great but I have to get it shipped to me due to remote location so it's quite expensive ($50 for 25litre drum) I did have a search regarding in tank meth but never went further with it... Is this something that a few guys do? Thanks Voltwings - I'll get the intake bought, installed and tuned in

If you have to get meth shipped to you it might not be the best option. Is this for pure meth or a mix? Yes a few of us who don't have access to E85 have used it with good results.

[KevMS6]

Pure meth from my not so local chemical supplier - about 100 miles away.
I mix 4litre meth to 1litre distilled water for my 5litre mix.

Works very well and BAT's dropped by 50%

I'll do a bit more research regarding in tank meth

[BigRedSpecial]

To be clear, I only run in-tank because I'm a lazy fuck and haven't hooked up my WMI kit yet. Once it gets hooked up I'll stop.

[Mazdazilla6]

Could the top mount be a restriction?

[rolanblack]

no he is running cpe tmic with meth. bats are covered and he is looking for a smig more of power

[Mazdazilla6]

Originally Posted by rolanblack no he is running cpe tmic with meth. bats are covered and he is looking for a smig more of power

Ah yea for some reason I thought he was running meth in tank. Fail read on my part.