allsteel

OK.To get my Puma up and going I'm gonna put the rally engine back in.Now it's a good strong long studded motor,pro ported but it's on 9.1 comp ratio.I've got BD14's to go in and i'm taking the restrictor off the turbo.I will change the map in the ecu but will it be safe at this ratio on 99 octane.The present map runs air to air,anti lag and water injection.So boys,can it be made safe on 9.1 comp?

Ryan

i would imagine so, but the boost will have to be capped at high RPM using that fuel.

allsteel

Was hoping for not less than 32psi.Does that sound ok.

Jamz

I wouldn't risk it.

rapidcossie

no chance on pump fuel mate...

will be closer to 22 if you still want a decent spark advance.

allsteel

Well,it was running 33psi and went like stink with anti lag on and off and is mapped for 99 octane fuel.

markk

iTrader: (2)

that comp ratio can easilly be accomodated with pump fuel and up to 2 bar on a T34 with very good results, i know, ive done it.

allsteel

That sounds a bit more like it.I'm gonna miss my Reyland motor but will have to make the best of it.Got a proper gearbox and big diffs now and ca'nt afford the motor.

rapidcossie

surley you will be into single fig advance at the top end?

allsteel

Don't really know yet,that's why i want as much input as i can get from the high comp boys.

Ian M500COS

Don't the scandinavians run big boost on high cr's ??

I ran 8.6:1 and put a big turbo (GT35) on it.... and we all know what happened there.

But it was fine with a T4 at 28psi. I'm sure you could run some "decent" boost with a T35 but the setting up of it would be very important!!

rapidcossie

they do but have you seen any of them holding the engine at high rpm and high loads for any period of time?

they all seem to get thrown about round quite short tracks.

most prob on funky fuel too.

Ian M500COS

Yeah, spot on there Euan, same as rallycross stuff, quick squirt here and there, and not long enough to really do any damage. It's all to do with the cylinder pressures. As you hold it on the gas, as the heat builds up the pressure climbs. There is a swanky term for it but I can't remember

rapidcossie

its horses for courses mate aint it.

not the technical term lol

allsteel

Any more input.