One option for rebuilding a 202

[traindriver]

Grunt Hunt – Rebuilding a 202 SM style.

In 2000 SM mag did a three part series on hotting up a blue 202 that was first rebuilt to factory specs and tolerences using a good old standard Varijet carb.
Once they got it back they did the following to spice up the old girl, step by step on an engine dyno.

1 – Air flow
Removed standard air filter and housing – gained 14kw just like that. Suggest a K+N or high flow air filter with new housing / lid.

2 – Fan
Removed standard crank driven fan blade – gained 4kw. Thermo fan installation suggested.

3 – Internal mods.
Swapped cam for a Crow 35667 cam (still available) and added new Crow valve springs, retainers and collets to the standard blue head.
New lifters and a Crow set of helical cut adjustable timing gears were added also.

Power now at 120kw @ 4800rpm with a peak torque of 259nm up from the factory standard of 83kw and 238nm torque.

4 – Carb and extractors
They were of the opinion that the Varijet was at its peak about now so they replaced it with a 350 Holley and added Pacemaker extractors. Power now 122kw @ 4900rpm with 265nm of torque @ 3400 rpm using simple bolt on stuff.

5 – Yella Terra head and upgraded Scorcher ignition.
Replaced the standard head with one from Yella Terra, complete with valves, springs etc. and beefed up the ignition system with one from Scorcher set at around 28 deg.
Power now 140kw @ 5200rpm with 282nm torque at 3800rpm.

6 – Fuel Injection
VK EFI fuel injection added run with a Haltec fuel only F9 ecu.



Total power = 166bhp at the wheels.

I plan to replicate this rebuild using a VK black 202 with EFI as a start point and eventually add a CRS supercharger kit (that can be turned off or on when needed) for my VK.

Cheers
AndrewOfNZ

[darkmoon]

Mate thats really cool. Shows that they are versatile old motors.
Kain

[253@7k]

Sounds sweet mate. You could probably do that pretty cheap too. Good luck with that.

[big_c_43]

Approximately how much do u reckon each of those steps would cost?

Coz i have a 1985 VK Black 202 3.3L EFI and i would like to do u some of those things too depending on the cash

[Mr Robbo - The General]

lol. they upgraded the carb to a 350 holly, then put on vk injectors? that makes sense, wasted money on the holly then.

[Sammy]

yeah but the whole idea of the test was to put each thing on and see what made or lost the most power.

[Mr Robbo - The General]

ah ok i see. sorry, it just seemed silly to upgrade the carb then put injectors on. I take it that the injectors went better than the carb, but it dosent say. like, the differnce between the carb and injectors in KW. thats what id like to see. The carb upgrade only added 2 KW and slightly more tourque, what did the injectors add to the base KW b4 the carb upgrade? it was 120KW with stock carb... so adding injectors, id estimate around 10KW more with injectors?

If i've done the maths right, 166hp is 123rwkw. so that would then mean the injectors added 3KW. something here still isnt right considering that it was supposed to be 140kw after the yella terra and ignition step... could this 140kw be at the fly? because 166hp after all those steps dosnt add up.

Ultimatly 166hp, is 123rwkw. I must have mist something.

[9898989]

how much and where could you but the air filter and housing???

[vk3800]

If i've done the maths right, 166hp is 123rwkw. so that would then mean the injectors added 3KW. something here still isnt right considering that it was supposed to be 140kw after the yella terra and ignition step... could this 140kw be at the fly? because 166hp after all those steps dosnt add up.

Ultimatly 166hp, is 123rwkw. I must have mist something.

You math is right. I checked it on the an online conversion page
http://www.onlineconversion.com/power.htm

And i agree, it appears that there is a loss of power from steps 5 to 6.
I think that the first 5 steps are done out of the car and measure at the fly wheel and the last is at the rear wheels

[traindriver]

You math is right. I checked it on the an online conversion page
http://www.onlineconversion.com/power.htm

And i agree, it appears that there is a loss of power from steps 5 to 6.
I think that the first 5 steps are done out of the car and measure at the fly wheel and the last is at the rear wheels

The engine and gearbox was supposed to go into a commy for testing but that fell through and they ended up using the Torana.

I noted too that there was a sudden change from Kw to Hp and guess someone made a ****up and perhaps the series got the chop?

I have the whole article scanned but a bit apprehensive to post it for fear of breaching copywrite?

AndrewOfNZ

[Mr Robbo - The General]

Its ok, it would have been really nice info if it was acurate, any1 with a blue or black motor could have found out what their car was capable of. id surly have done it to my black 202 EFI if it was viable, thats why i wa sinterested.

[big_c_43]

Still in an efi VK black 202 which has 109kw stock to about 140kw is pretty imprssive.

[Mr Robbo - The General]

yeah but we are saying, is this at the flywheel or at the wheels? because step by step somthing isnt right, its the conclusion i've come to. 140kw at the fly. if its at the wheels, that dyno chart dosent reflect it.

[Sammy]

from my memory of reading the article some time ago, all the tests of the carbies and heads etc was all done on an engine dyno, so the 140kw was at the flywheel ... then they fitted the motor and efi to the torana and it made 166hp at the wheels .... which is about 120-125kw at the wheels depending on drive train loss etc thats about 150-160kw at the flywheel and about 210hp ....

my efi 202 (with standard ecu) makes 132hp at the wheels and im not sure how to get alot more out of it without going stupidly wild, so they have done very well.

i think all the numbers are fairly right.

[Mr Robbo - The General]

Shit, your thing gets 132 rwkw? they are factory 109 rwkw. whats been done to it, thats alright dude.

[gd81]

VK efi's stock are 109kw at flywheel
VN v6's stock are 127kw at flywheel and around 87kw at the wheels.
which is around 33% power loss. so taking that as base the stock VK efi's are only 76rwkw. or around 100rwhp.

You loose a lot of power through transmision and diff.

[Mr Robbo - The General]

lol, yuk. my vk has to go better than that :'(

[Sammy]

Shit, your thing gets 132 rwkw? they are factory 109 rwkw. whats been done to it, thats alright dude.

HP not KW ... i wish it was KW

its about 95-100kw at the wheels ....

factory yes they are 109kw, but thats at the flywheel, not at the wheels.

as for whats been done to my motor, go here:

http://www.oldholdens.com/cars/bluelhtorana/specs.php

i actually need to get it back on the dyno as theres been a few changes to the engine and i reckon it will be close to 140hp now .... but yeah, need to dyno it soon!