"Parmas" Motor

[advocate]

So if front mount creates huge turbo lag and top mount spools faster but hotter (and thus less boost), how the hell do you pick which one you want? Sounds like very big drawbacks on both parts.

I would think a larger engine, which creates more overall exhaust, wouldn't suffer as much from excess lag from a front mount versus a Yaris which burns much less overall fuel. Correct?

[Blown_xa]

Originally Posted by advocate

So if front mount creates huge turbo lag and top mount spools faster but hotter (and thus less boost), how the hell do you pick which one you want? Sounds like very big drawbacks on both parts.

I would think a larger engine, which creates more overall exhaust, wouldn't suffer as much from excess lag from a front mount versus a Yaris which burns much less overall fuel. Correct?

read my above post. There is no noticable lag.

[rob323]

Originally Posted by advocate

So if front mount creates huge turbo lag and top mount spools faster but hotter (and thus less boost), how the hell do you pick which one you want? Sounds like very big drawbacks on both parts.

I would think a larger engine, which creates more overall exhaust, wouldn't suffer as much from excess lag from a front mount versus a Yaris which burns much less overall fuel. Correct?

You are over simplifying it a fair bit. Both setups can be made to work as good as each other and it depends on what purpose you want to design it for. There's alot of variables to be taken into account though to get it right (eg. piping diameter, bends, pressure drops, turbo sizing and efficiency ranges, gear ratios, cam design/ duration/ timing, engine timing, bov design etc etc).

And if all else fails, turn the antilag on