200SX Normally Aspirated

PhatBob · Post by **PhatBob** » Sun Aug 03, 2008 8:51 pm

Gave up with the turbo, for various reasons, one of them being that it would put me into a silly category in Sprint competitions.

First stage of the developement:
Stock SR20DE.
Head gasflowed by Ben@Angelworks, skimmed 1.5mm to get the compression a little over 11.5:1
Solid lash adjusters.
Ferrera double valve springs.
Throttle bodies.
Fidanza flywheel with ACT 6 paddle clutch.
Z32 gearbox with ally prop.
VEMS v3.4 ECU running AlphaN fuelling and ignition
MSD EDIS4 coil pack.

Second stage:
Change Z32 'box back to stock type.
Proper exhuast manifold.
300deg duration ProCar cam from my new mate in South Africa.
Glass fibre doors, bonnet, boot, front wings.
Lexan replacement glass.
Driver weight reduction plan.

Post by **Stuart** » Sun Aug 03, 2008 8:56 pm

Bloody awesome
I am an NA fan these days so I'll watch this with great interest

duncan · Post by **duncan** » Mon Aug 04, 2008 7:13 am

Sounds good Bob - what do you reckon the power potential is without the turbo?

drifter · Post by **drifter** » Mon Aug 04, 2008 7:55 am

Looks good Bob. Should be able to sell the Z32 for a fair few

Fast Eddy · Post by **Fast Eddy** » Mon Aug 04, 2008 8:05 am

I think around 250bhp is acheivable on the SR20DE. I know a guy who builds them for Tommy Kairas.

PhatBob · Post by **PhatBob** » Mon Aug 04, 2008 9:11 am

With things as they stand I should make 170 to 180bhp, exhaust and cams should take me up to the 200bhp mark.
One of the blokes on the VEMS forum has achived ~150whp without any significant modifications, so the initial gains seem to be sensible. The machinist at Mass Race Engines made 172bhp on his Sunny GTi with similar headwork and marginally less compression.

The engine I'll build after that (high compression pistons, steel rods, profiled crank, 320deg duration high-lift cams) will get me into the mid 200's but then its laws of deminishing returns (isnt it always?) the bloke in South Africa reckons that the engines he built for Nismo in SA produced ~280bhp and he's happy to sell me all the stuff I need to get that, and at SA prices you cant beat that for a deal, the ITB kit cost me just under 500quid... :-D

PhatBob · Post by **PhatBob** » Mon Aug 04, 2008 9:13 am

[quote="drifter"]Looks good Bob. Should be able to sell the Z32 for a fair few

PhatBob · Post by **PhatBob** » Mon Aug 04, 2008 9:15 am

Fast Eddy wrote:I think around 250bhp is acheivable on the SR20DE. I know a guy who builds them for Tommy Kairas.

Nice, does he have any recommendations for exhaust manifolds? I see a few in Japan, but most are for FWD cars.

Ian200sx · Post by **Ian200sx** » Mon Aug 04, 2008 9:42 am

maybe worth talking to http://www.tonylawexhausts.co.uk/2410/frames.php They are very good with NA cossies etc

PhatBob · Post by **PhatBob** » Mon Aug 04, 2008 10:15 am

Ian200sx wrote:maybe worth talking to http://www.tonylawexhausts.co.uk/2410/frames.php They are very good with NA cossies etc

Its a point I've considered, the bloke in South Africa http://www.martinbruwer.com/ has sent me the diameters and lengths of the manifold that he'd made with his cams, so I've got some info on what needs doing, its just that the Japanese stuff is tried and tested and known to fit perfectly everytime.