things to upgrade for high performance

**Dougal** · 14th April 2012, 08:38 AM

Originally Posted by isuzutoo-eh

I broke the engine pipe on my n/a Isuzu. You don't want anywhere near that noise. Could be heard kilometres away.
Upon shutdown, couldn't hear anything. Industrial deafness is a real risk.

I went for a short test-drive with no turbo or exhaust. It's deafening.
But with a turbo and no muffler, I don't know. I suspect it's the sort of thing 18 year olds would love. I'm running a 2.25" system with one muffler, which is quiet. It'll be replaced with a mostly 3" system and straight through muffler at some stage.

One interesting point, when I was tuning my boost compensator I did some driving with the waste-gate popped so boost was zero. At 100km/h I had exhaust drone that I could easily hear inside with the windows up. With the turbo working even with the windows down you hear the exhaust.

**isuzurover** · 14th April 2012, 09:30 AM

Originally Posted by flagg

Thanks for that.. Post turbo fitment I was going to drive to the exhaust place... Without an exhaust past the turbo.. Might rethink that..

I did that. Wasn't too noisy. Exhaust shop was 12km away.

In fact it was MUCH quieter than driving my 2.25D to the exhaust shop with extractors and no exhaust.

**bushhack** · 14th April 2012, 11:21 AM

i got the exhuast shop to make my 3inch muffler with flanges so it could be removed
also got them to make up a pipe to take the place of the muffler

with out the muffler it is way to loud but i guess the volume would vary depending on the amount of boost?

**justinc** · 14th April 2012, 11:27 AM

I used a complete 2002 Td5 defender system, just connected my dump pipe and engine section to the first flange before the original Td5 main muffler. If it flows enough for a chipped higher revving Td5 it should be fine for mine, and it is nice and quiet, looks OE, and fits easily. IMO the rear resonator is important, too.

JC

**c.h.i.e.f** · 15th April 2012, 11:51 AM

i find that the inside cab noise from the turbo is the annoying part as i am running a 3" with no mufflers it isnt really that loud its just turbo whistle more than anything.
[ame=http://www.youtube.com/watch?v=QT2JySs3Y6s]Land Rover County 4bd1t 30psi - YouTube[/ame]

**Dougal** · 15th April 2012, 01:26 PM

Does sound good though. Which turbo is that?

**inside** · 15th April 2012, 02:44 PM

Much difference between say 20 and 30 psi of boost?

**c.h.i.e.f** · 15th April 2012, 02:49 PM

Originally Posted by Dougal

Does sound good though. Which turbo is that?

Unfortunately the person filming had the mic covered with finger so it's not the best quality....it's the gt2052s it's a shame I stuffed it being stupid as it lasted when running 20psi but as you already know its just to small for our application and our figures where chasing...

**c.h.i.e.f** · 15th April 2012, 03:00 PM

Originally Posted by inside

Much difference between say 20 and 30 psi of boost?

Well that's a hard one as I play with fueling and timing all the time so it's never running the same settings all the time... 20psi from the turbo I was running with the fuel setting was pretty good performance but then I got more boost by permanently closing the wastegate which gained me 5psi more not much increase in performance as boost does not give you power as such .. I then got fuel pump mod done which then in turn upped max boost since wastegate is closed to 30psi (maybe more as gauge only reads to 30) that's when performance got rediculous but I couldn't burn it all hence new turbo now

**flagg** · 16th April 2012, 06:28 PM

Originally Posted by c.h.i.e.f

I then got fuel pump mod done

Excuse me if I've been under a rock, but what was the mod?

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