The Enigma

They are the top guys for mapping the MOTECS eCu's but the only place I would get to build a 3SGTE would be YVS performance.

Caddyshack

Whilst we are on the subject of 550bhp plus. I wondered what benefit I would see of long stroke by over normal, I understand you get better rod angles and I assume the extra 200 odd cc will make the turbo spool faster due to more exhaust gas?


I also assume that 200cc extra simply adds power.

I wonder if my efr turbo would struggle though as it tops out at 530 bhp. I know I can get 530 without long stroke but once I get to 500 bhp and more I am more interested in torque, fast spool and road drivability.

I doubt an ally block would be worth the £3000 plus extra on this spec although I like the reduced weight and 2.5 possibility. Should be quick in my pug 205 which is close to 1100 kg.

ajamesc

I thought about the idea of a more modern crank and as mark put it the yb one is 20 odd years old now. But to me I had to draw the line some wear as it is an expensive crank and to be fair the power I want will be shockingly quick on the road so it will be enough for me at it is spec'ed. plus mark said the standard crank will be ok at that power level

Mark Shead

It should have instant responce everywhere I really like the long stroke motors I do. I have sold a turbo kit to a 2.340cc engine and recommend a 7670 on such a large engine to make sure it makes it 500hp and hold on to it where if it had a 7064 I would expect it not to hold 500hp past 6500rpm.

Mark

Caddyshack

What power will you be at then?

I had 500 bhp in an AMG merc which was supercharged and it used to totally put the power down through 2wd and an lsd but that was nigh on 2 tonnes so the lower weight should make it lively. Miy 205 certainly felt fast on low boost at 430 bhp but I am keen to try the high boost map one my box is finished as 420 did not feel as fast now the lag of the t34 had gone.

Caddyshack

Thanks Mark, I think I will save a little longer and go long stroke but I wonder if I may struggle to house the bigger turbo and as I already have the smaller one in there I might be better to simply accept a little less power after 6500 rpm.

Mark Shead

The 7670 is the same frame size only the inside of the turbo is bigger.

Mark

ajamesc

Hoping for the 650 mark! I'll be 6 degree rear beam supra diff with the up rate kit coil overs all round r888 tyres and I'll be fitting adjustable tca's as well. So should be ok in the dry

Caddyshack

Cool, my spec for the driveline is that apart from the 6 degree but that is coming soon.

Caddyshack

Thanks Mark, sounds a simple upgrade then, are they internally gated?

I guess if we go to that turbo on a long stroke we will be nearer 600bhp once the head, cams and Pistons are done?

Mark Shead

It is the same internal gate, Closer to 580hp.

Mark

Caddyshack

That's it then, spec sorted, just need to sort the dosh!

smiley

Whats the aprox cost of doing a stroker engine

ajamesc

Rods Pistons crank block liners and machining must be over 5 grand

Caddyshack

Plus the head and cams with some long studs. The good thing is that once done by MAD the engine has a good value should you want or need to sell it.

Caddyshack

It's funny, I was at the traffic lights today in my 1.9 gti with 160bhp engine and a brand new c class merc made it clear by edging forward that he was up for a drag, I pulled away and mullered him, now that is probably a 6-7 second car to 60.... He pulled up at the next lights and tried again,.....I monstered him. Now we are looking at prob 400 bhp and similar torque on top of that in a 4wd car with 2 limited slip / atb diffs and an active centre diff in the same weight body shell with just the transmission, cage and body kit on top....I wonder how much quicker with launch and anti lag that would have been on 580bhp?

smiley

seems the way then really not gonna be much more than it would be to build a 500+ non stroker std cranks good to 500 so that would get changed anyway?

smiley

next level mate it'll be 2 wheeled oposition youll be looking for lpl

ajamesc

Over 5 was a guess it soon all adds up! I'm keeping the standard crank as told it's good for 700. Not as good as a more modern crank but there expensive

Hellraiser

so what exactly is std cossie crank good for power wise?
what power stroker? and how much to buy? i wanna be mid 600bhp so wanna know prices options etc

ajamesc

Got to be a hard question to answer really as different tuners have different ideas. Only a couple of builders who build these engines to a high standard it is expencive if you want a good engine that will do what your told it will. I was told a stroker kit is the way to go but the crank is over two grand plus I'd need oil spray jets so took the other option as a standard crank will do me for a 650 ish build

smiley

i was discussing spec with ahmed it came up that at 500 we wouldnt need to uprate bottom end so me saying 500 std crank was probably wrong of me mate couldve ment other components at 600 we do more of a costing convo at the time

Hellraiser

Thanks for that James so i can used std crank on std/std grind for 650ish build and it will be upto the job then?

ajamesc

I am but you need to talk to who is building your engine or mapping it im no specalist can only say what I've been told is ok for what I'm doing

SGP

Sorry , I am wondering about the cossie's engjne .

Thanks

Caddyshack

above says 700 on std crank but pushing the limit is never the best.

I think you can be like Rod Tarry and go closer to 1000 bhp if you buy an after market crank on std stroke but you will be spending £30k plus to get to that spec from scratch I would think.

The strokers will depend on the turbo and head work, I would think 700-800 bhp or more is fine if your pockets are deep enough, but at this level the fuel system, brakes, suspension and gearbox / diffs are going to need lots of money to keep up.

Even at 500 bhp in 4wd you need some pricey diffs and gearboxes to be reliable.

Rod-Tarry

The fuel system is the forgotten part. If you use fancy fuels like FTW Purple at very high boost it can double your fuel needs. We are going for a Veyron P1 pump but above 3.5 bar we need 2 of them so that's £1500 on pumps it can get really mega expensive over 900bhp.

Firefox

I have some questions concerning the CR and stroke for a setup aiming at 550bhp. Hope you can help.

So if i have an engine with a CR of 8:1 and std. stroke and bore with that power curve:

Can anyone give an educated guess how the power curve would look like if the engine had a CR of 9:1, std bore and a stroke between 84mm-88mm? Does it even make sense to go for stroke without changing the bore?

How much stroke can a std. block accept before machining is needed?

Where can i get pistons an rods for a CR of 9:1 that can take 29 psi of boost of an efr 7163 all day and night?

Thank you very much.

PS: that dyno is of an yb engine. If i violated someones rights, because i used that dyno, plz tell me i´ll change as desired.

Firefox

Sorry for double post, plz delete.