How much ABUSE can a standard 8v bottom end take from boost?

[VtsTom]

Basicaly me and a few friends want a bit of play with a saxo on boost for a cheap as chips budget.

We have mk1 1.1 saxo that we intend to fit a vtr lump in. Take out all the interior, jack the back up a bit, skinny wheels on the back with slicks on the front, cheap as possible turbo lump up front with coupious amounts of nitrous to use between us at santa pod. £3k budget

I have a few vtr bottom ends so im not worried about it going pop. Just wonders what makes them go bang?

Going to be looking for a mf2/sigcon and extra injector or 2 for fueling, random turbo manifold, turbo, home made pipe work, fat headgasket, huuuge intercooler, rather loud exhaust exiting from just infront of the front wheel (dont ask, a mates requirement).

I think we could get about 160bhp at the fly, at a push. Then maybe 100-150bhp of nitrous ...:panic:?

Any cheapo ways to strengthen the block a tiny bit?

What exactly lets go and why?

[williamsvts]

just use an FSE boost valve for the fuelling lol, thats proper budget bodge tuning :P

and i would say pistons would melt because of the heat, nothing else should let go before that happens.

[Petey1991]

Sounds like a good plan

[AlexR]

the vtr block can handle 160-180bhp with no probs really apart from reduced life. it's all in the mapping anyway with boost.

the clutch and gearbox are the bits you need to spend on ;)

[gd16]

Spend money on clutch, gearbox, intercooler, engine mounts and most importantly mapping.
Then you shouldn't have to worry about the rest *as much*


Gav's is a great example of how much the TU engines can take. My VTR has been seeing up to 8psi for the past 2 years+ and 20k miles. Completely standard engine components, even headgasket. Driven hard every single time its out. No worries from it at all.

[Sophia_Bush]

been running 14psi through my 1.1 mpi alloy block for 6k without problems it can take 18psi no problems to just make sure its mapped mine was playing up so melted exhaust valve. But other than that it was great 14psi is good all day long, going to do 16psi this time mapped, will going more mental later this year when phase 2 comes into plan

[RCD-Performance]

its not all about how much boost you run, its about how much air the turbo is flowing at any given boost, which obviously relates to how much fuel you put in at any given time.

i would think you'll end up shearing a shaft or killing the box with a stupidly large ammount of nitrous.