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Author Topic: going to look at hopefull y my new g40 :-)  (Read 6514 times)

Offline Nick_S

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Re: going to look at hopefull y my new g40 :-)
« Reply #15 on: December 21, 2009, 08:35:04 pm »
One thing i noticed and worthwhile bearing in mind if you are staying with the G40 blower; don't go bigger bore than 2.25" on an exhaust system.
I've recently installed one of the PPP systems which is 2.5" at the downpipe exit. Having stepped up directly from a 1.75" system, i have lost 1 psi of boost. Mine already has a very well flowed BVH cylinder head which was giving 9psi boost on the OE bore with a 4 branch, now gives 8psi with the PPP system (65mm toothed pulleys). Car certainly feels more laggy low down now than it did. I could fit a bigger blower of course to get max output, but i'll try tweaking a few things before i go down that route.
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Offline hayesey

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Re: going to look at hopefull y my new g40 :-)
« Reply #16 on: December 21, 2009, 08:52:16 pm »
you've lost 1psi of boost because more air is getting consumed by the engine as the exhaust isn't causing as much of a restriction.  So 1psi less back pressure in the inlet manifold = more power. :D
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Offline Yoof

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Re: going to look at hopefull y my new g40 :-)
« Reply #17 on: December 21, 2009, 08:55:04 pm »
Think you've got some wires crossed Nick...

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Offline Yoof

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Re: going to look at hopefull y my new g40 :-)
« Reply #18 on: December 21, 2009, 08:56:06 pm »
P.S- It's good to know our systems flow more than stock  ;)
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Offline Robin

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Re: going to look at hopefull y my new g40 :-)
« Reply #19 on: December 21, 2009, 08:57:35 pm »
lol

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Offline Nick_S

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Re: going to look at hopefull y my new g40 :-)
« Reply #20 on: December 21, 2009, 09:05:18 pm »
L O L

Feels more like a turbo now anyhow
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Offline Robin

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Re: going to look at hopefull y my new g40 :-)
« Reply #21 on: December 21, 2009, 09:07:15 pm »
really? how does it feel like a turbo?

btw where is my sodding breakfast coolant boy?
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Offline Nick_S

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Re: going to look at hopefull y my new g40 :-)
« Reply #22 on: December 21, 2009, 09:11:08 pm »
Quote from: Robin on December 21, 2009, 09:07:15 pm
really? how does it feel like a turbo?

btw where is my sodding breakfast coolant boy?

Power delivery.

That was your ethylene glycol special liquid breakfast.
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Offline Robin

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Re: going to look at hopefull y my new g40 :-)
« Reply #23 on: December 21, 2009, 09:18:44 pm »
really? have you driven a turbo'd Polo before?
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Offline Nick_S

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Re: going to look at hopefull y my new g40 :-)
« Reply #24 on: December 21, 2009, 09:25:08 pm »
Nope, just a fezza RST and Nissan Silvia petrol engine wise.
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Offline Robin

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Re: going to look at hopefull y my new g40 :-)
« Reply #25 on: December 21, 2009, 09:32:47 pm »
can't really compare it to a turbo'd polo seeing as you not driven one lol.

comparing the lader to the turbo is a massive difference, yes i know your's is not the standard lader set up but the difference between the 2 can't be as big as the difference from the lader to the turbo, the turbo feels VERY VERY much like a lazy GT engine until it comes on boost then its frantic after that.

i can see why you say yours boosts later but the turbo boosts alot higher in the rev range than the lader on any set up.
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Offline Nick_S

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Re: going to look at hopefull y my new g40 :-)
« Reply #26 on: December 21, 2009, 09:38:32 pm »
Thats like how mine behaves, don't notice any positive boost pressure until about 4.5k then its a rampant mo fo.
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Offline Robin

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Re: going to look at hopefull y my new g40 :-)
« Reply #27 on: December 21, 2009, 09:40:34 pm »
Quote from: Nick_S on December 21, 2009, 09:38:32 pm
Thats like how mine behaves, don't notice any positive boost pressure until about 4.5k then its a rampant mo fo.

really? that high up???? that will be shit for road use! no boost no boost no boost no boost no boost no boost then 8 psi of boost!
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Offline Robin

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Re: going to look at hopefull y my new g40 :-)
« Reply #28 on: December 21, 2009, 09:44:24 pm »
also if it only gets into boost at 4.5k that means you have 2.5k max to go before you have to change gear!

you sure you not driving a diesel?!
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Offline Nick_S

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Re: going to look at hopefull y my new g40 :-)
« Reply #29 on: December 21, 2009, 09:52:00 pm »
It don't need lots of boost low down when its as torquey as hell off it. Engine was built with high boosting in mind, so i'm not all that surprised ;D 8P box on at the moment don't help to compare acceleration/gear changes, but 1st and 2nd are pretty useless :D
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