RS_Gav

Hi guys. Trying to get a few ideas of what kind of power my new YB build will net. I have a very competent tuner here but he has little to no experience with Cosworth motors. We are trying to figure out how far to turn it up safely.
Main engine specs as below..

Brand new 200 block with new Cosworth pistons and Farndon rods. 8.5 to 1 comp ratio. Standard crank. Ported/polished 4wd head with Kent CW7 solid cams and solid lifters. New valves. WRC spec head gasket. ARP head stud kit.
Garrett GTX3076 turbo on a Peter G tubular exhaust manifold. Swedish intake plenum with a 77mm throttle body. The engine runs on ethanol fuel and has a fuel system made to suit including 1500cc injectors.
The engine uses a MoTec M400 ecu.

Any thoughts on expected power on these specs would be much appreciated.
Cheers,

Gav

jontysafe

You`re more likely to be limited by your gearbox and diff than engine. on Ethanol that engine, if the heads been done right should see 550-600bhp all day long.

cossynut2

Sounds like it will have plenty of power with that specc, 1500cc injectors are the biggest I have heard of on a YB, mine are 890cc and chuck in loads of fuel. MPG is obviously not a priority. What State in Australia are you in as I know the rules on modifying cars varies from State to State. Is it going to be a track car or road car? If a road car you should suprise most Aussie performance cars for sure!!

Caddyshack

Surely mpg is based on the map, not the size of the injector?

jamie's

Ethanol requires a much richer mix than petrol, so huge injectors are required to supply it
my guess would be 600ish on ethanol, dont think the turbo will flow any more

cossynut2

I am not an expert but with the specification and potential huge bhp fuel economy is not his priority, it was just a little joke.

RS_Gav

I'm in Perth, WA mate. Car is still licensed but will see track time. Once everything is running right, I will look to get all the modifications engineered and signed off.
Should surprise a few big V8's on the road but in saying that, 600-700+ HP cars here on the road are fairly normal it seems. Lots of modified Jap cars, big HP turbo Ford Falcons and supercharged HSV's running around.


Thinking the same thing. It has a fairly new Gripper diff in it rebuilt by Bara Motorsport. I am not expecting the standard T5 to last very long at all! Looking into a Tremec TKO box as we speak.


I got the joke mate Economy will be rubbish but not a priority at all.

cossynut2

RS Gav. I used to live in Adelaide and upgrading your engine etc used to be a no no. Last time I visited my Brother-in-law we went to a big car show and lots of people I spoke to said they had been booked by the cops for having modified cars. I had an Aussie built V6 Capri and I imported lots of tuning parts for it from the UK. It had flared arches , lowered suspension, bigger wheels etc and looked and went well. I got stopped by the cops and they defected it and told me I had to put it back to standard!!! To say I was pissed off is an understatement!!
Sounds like WA is not as strict as South Australia.
Your car sounds like it will be a beast!!

Rod-Tarry

Size of Injectors depend on calculated fuel flow at full throttle on the fuel required. I use 8 injectors - 4x1700cc & 4x1000cc. The mapping will allow the car to pootle along if you require or run at full throttle with 1000bhp on a race fuel like FTW Purple that uses 60% more fuel than pump. A modern ECU can control these huge injectors with great accuracy. It does not mean bad fuel economy on light throttle if your mapper knows what he is doing. Have seen 22mpg on a long run on the Motorway dropping to 4mpg on a Topspeed run. The words chuck in loads of fuel has made me chuckle that's not what its about.

Adam-M

Nice cosworth mate you anymore pics? Bet not many people in Australia even know what it is lol

costina

iTrader: (1)

ARP Head stud kit.

Don't use them either 6 or 10 long studs.

ARP's can and WILL crack your block.

Regards

Paul

cossynut2

Interesting stuff Rod , i was thinking more when you are on full boost there must be a lot of fuel going through the injectors and as you said 4 mpg. Depends on how the guy is going to drive it and how well its set up but as he said fuel economy is not a priority. To me big power with good mpg dont go together.

RS_Gav

The restrictions on vehicle modifications are just as strict in WA. Sometimes it's just a case of how long you can get away with it by 'flying under the radar"...


Thanks mate. I do have a build thread on here somewhere but it hasn't been updated for a few years now. I've had the car off the road for about 2 years getting the new engine built.
Couple of recent pics below. Managed to score a feature in Performance Ford back in 13' which was great.

cossynut2

RS Gav. I still have the magazine with your feature in it, nice one. Do you have to have a yearly car test in WA like our M.O T.? If so how do you get through the emissions test?

RS_Gav

Nice one!
No MOT here. I would much rather that than the random defect notice system we have. Any police officer here can put a defect notice on your vehicle with absolutely no mechanical knowledge or idea of what he is looking at.

cossynut2

When they stopped me ( I was not speeding or doing anything wrong ) the cop looked over my car and said "this doesnt look like a standard Capri to me I am going to do some checking " He went to the boot of his car and came back with a massive book which had all different makes and models of cars specifications in it. He also had a tape measure and one of the things he did was measured the wheel track front and back. " Too wide as I thought" he said while looking at the Capris standard factory specification.The 4 barrel Holley carb was also picked up plus the steering wheel was to small and the suspension was lower than it should have been and lots of other things.
Luckily I had some mates who also had V6 Capris and lots of spares so we managed to swap everything back to standard so when I took it to the Police Garage it passed and the defect notice was removed.
I then put everything back to how it was and never got stopped again!! I sold the car later with all the modifications but dont know if the new owner ever had any problems with the cops.
That is one good thing here ,you can modify your car as much as you like and providing it passes the M.O.T. no worries. I declare all the modifications done to my 2wd Sapphire to my Insurance Company and also have an agreed value of £21,000 on it so if it was stolen or written off at least I would have enough to buy another good one!