Wastegate & dump valve questions for an HKS T51-R KAI turbo

[PGiljevic]

Some nice work there - did you do the exhaust manifold yourself? :god

The exhaust manifold is a stock HKS item, but I modify it by TIG\'ing on a different wastegate flange (Tial V44), and insertion of EGT probes in each pipe and also a pressure sensor port. All other stuff I made myself.

[Grant Monkhouse]

Pete I think you have an obsession with fergies rear? But I can see where you are coming from! Lol

[lockwood77]

Jeez, I\'m out of my depth here chaps! Thanks for the pics Peter, I think I can tell what\'s going on there. Bearing in mind I know nothing about the turbo configuration on my car, would an external wastegate like yours be of any use if there is an internal one in the T51?

To answer the question as to why you\'d have a T51-R at such a low boost setting, the answer is basically that as part of buying the car from Freddy, a Power FC was fitted to replace the locked FCon Pro V and mapped by Geff at REWorx.

Geff commented that the injectors are approaching maximum and the exhaust is fairly restrictive, so to make any more power/use higher boost, I would need to upgrade these parts. Also, at 421bhp, it already spins its wheels in second gear and it seems silly to spend money/reduce engine life making more power that I can\'t use.

However, if you\'re telling me that higher boost will actually equate to better responsiveness and less likely wheelspin thanks to a more gentle (but higher) power curve, that sounds like a good idea. In which case, the wastegate plumbing is a little academic right now as I need a higher flowing (but still quiet enough for 98db drive-by) exhaust and some fuelling upgrades (must already have an uprated pump, I can hear it whining in the boot and I can\'t see how you can get 421bhp without one and bigger injectors! I just don\'t know the spec).

Any thoughts on the above? I\'m not trying to make a drag car, I just want a nice balance of power and driveability with as much engine longevity as possible. Ta!

[jackaleks]

Bearing in mind I know nothing about the turbo configuration on my car, would an external wastegate like yours be of any use if there is an internal one in the T51?

pretty sure there\'s no such thing as a T51 with an internal gate. you must already have an external gate on there with either a short screamer pipe or just venting to wherever it\'s pointing.

if you look on Rice Racing\'s nicely made manifold you\'ll see the gate in the middle of the smaller exhaust run; yours will probably have a couple of runners coming off the main manifold going into a wastegate then nothing. if you take it to any decent performance garage and tell them you want your wastegate plumbed into your exhaust they\'ll be able to sort something out for you.

[lockwood77]

Cool, ta.