Any boosted road course k20's?

NoTorq · Dec 21, 2012

Hey guys, was just wondering if anyone has had a boosted k20 or k24 survive multiple track days and track day abuse. I've had my N/A k20 in for about a year now and am looking to get more power than an an N/A setup can provide. I plan to use quality parts ( full-race kit with a gt3076r tuned by mikey at profunction) and run 8-12 lbs for next year and be between 320-350 whp.

My main questions are....

-Can a k20 turbo setup safely survive 20-30 minute sessions at full throttle in 80-100 degree heat?
-Is my factory lsd strong enough to survive this kind of abuse?
-Is downshifting constantly at high rpms risky with a turbo setup?

eyecarvether4iam · Dec 21, 2012

Re: Any boosted road coarse k20's?

At those power levels, you should be fine. The 3076R is a great turbo choice, even though I am a little biased! =p

Figment-The-Dragon · Dec 21, 2012

Re: Any boosted road coarse k20's?

NoTorq said:
Hey guys, was just wondering if anyone has had a boosted k20 or k24 survive multiple track days and track day abuse. I've had my N/A k20 in for about a year now and am looking to get more power than an an N/A setup can provide. I plan to use quality parts ( full-race kit with a gt3076r tuned by mikey at profunction) and run 8-12 lbs for next year and be between 320-350 whp.

My main questions are....

-Can a k20 turbo setup safely survive 20-30 minute sessions at full throttle in 80-100 degree heat?
-Is my factory lsd strong enough to survive this kind of abuse?
-Is downshifting constantly at high rpms risky with a turbo setup?

Yes, I would recomend an oil cooler though
For that power level YES
Depends on the turbo

Dansk20pug · Dec 21, 2012

Re: Any boosted road coarse k20's?

Borg warner EFR 7670

Bossman · Dec 21, 2012

Re: Any boosted road coarse k20's?

on the low side of that power goal you could still do it N/A

tottenham12712 · Dec 21, 2012

Re: Any boosted road coarse k20's?

NoTorq said:
-Is downshifting constantly at high rpms risky with a turbo setup?

Figment-The-Dragon said:
Depends on the turbo

Would you mind explaining why that may be a problem? Not being a jerk, its a genuine question

EG6VtecR · Dec 21, 2012

Re: Any boosted road coarse k20's?

for those power goals I would rotrex it instead of installing a turbo.

McCoy · Dec 22, 2012

Re: Any boosted road coarse k20's?

EG6VtecR said:
for those power goals I would rotrex it instead of installing a turbo.

:like:

Huge power is a distant second to great handling. S/C will deliver power well and will be reliable. S/C power comes on from idle on up and is easier on your transmission. When power comes on too quick the reliability goes down.

EG6VtecR · Dec 22, 2012

Re: Any boosted road coarse k20's?

McCoy said:
:like:

Huge power is a distant second to great handling. S/C will deliver power well and will be reliable. S/C power comes on from idle on up and is easier on your transmission. When power comes on too quick the reliability goes down.

I approve this message :nod:

today i started street tuning my rotrex on the "low cams". i set the boost cut protection to 10psi for now. and at 6200 rpm is making 10psi. roughly it increases a little over 2 PSI per every thousand rpm. partial throttle or full throttle there is zero, i mean zero lag. extremely responsive. from idle to what ever rpm power is always on demand and so easy to drive.

so the rotrex is highly recommended. i should get under 15psi by 8,000rpm and 420whp or so on pump gas. later on I'll tune the boost by gear to maximize traction. can't wait to finish tuning it and take it to the road course next summer. I shall see no driveability or traction issues on the road course. well maybe some brake fading :scared:

stern tracked his k20a1 rotrex EG6 and had zero issues other than his half size radiator wasn't cooling enough for long track sessions.

Figment-The-Dragon · Dec 22, 2012

Re: Any boosted road coarse k20's?

tottenham12712 said:
Would you mind explaining why that may be a problem? Not being a jerk, its a genuine question

Sent ya a PM sir :new_slayer:

4dvti · Dec 22, 2012

Re: Any boosted road coarse k20's?

I vote rotrex c30-94 for track use. We have numerous rotrex circuit cars here in the UK.

Dansk20pug · Dec 22, 2012

Re: Any boosted road coarse k20's?

4dvti said:
I vote rotrex c30-94 for track use. We have numerous rotrex circuit cars here in the UK.

Why use a c30 when you can use a c38

EG6VtecR · Dec 22, 2012

Re: Any boosted road coarse k20's?

Dansk20pug said:
Why use a c30 when you can use a c38

I agree. at least C38-61 and if want to limit the power below 350whp then just use a pulley combination for a max boost of 8psi or so at redline. If in the future you get used to the power just replace the pulley. Easy upgrade. something that the C30 line will fall short.

6spd_EK · Dec 22, 2012

Re: Any boosted road coarse k20's?

I highly suggest NOT trying this on stock internals. You will need a full size thick radiator (i suggest Koyo or a high quality custom piece). What core does Full Race use for there intercooler? I would suggest either a Garrett core or Bell Intercooler Core - as they are much more efficient than most others out there. You'll need an external oil cooler as well. The problem can be getting air to the radiator with the intercooler blocking the majority of the air flow

I think you'll want a clutch type diff - I don't think the oem can take the repeated abuse of coming down hard off the curbing. You may have issues with longevity of the transmission (for us it was 4th gear) as well.

For a road coarse car - I highly suggest fine tuning your suspension & tire set up. what is your current suspension & tire setup, and one what chassis? lastly, is your car already caged?

4dvti · Dec 23, 2012

Re: Any boosted road coarse k20's?

Dansk20pug said:
Why use a c30 when you can use a c38

I'm just going by personal experience

Stock k20a2, c30-94, 100mm pulley and 399.1bhp. I think it's quite a good setup. You really have to try it to appreciate it.

Dansk20pug · Dec 23, 2012

Re: Any boosted road coarse k20's?

4dvti said:
I'm just going by personal experience Stock k20a2, c30-94, 100mm pulley and 399.1bhp. I think it's quite a good setup. You really have to try it to appreciate it.

I've tried a very similar setup all be it in a westfield.. It's a great setup for sure but that doesn't mean it can't be improved upon

rbsjnh · Dec 23, 2012

Re: Any boosted road coarse k20's?

Efr killed the Rotrex. the announcement just hasnt been made yet.

go smaller than a 7670.

The bw 7163 efr shown at sema may be a great choice.

eyecarvether4iam · Dec 23, 2012

Re: Any boosted road coarse k20's?

rbsjnh said:
Efr killed the Rotrex. the announcement just hasnt been made yet.

go smaller than a 7670.

The bw 7163 efr shown at sema may be a great choice.

I heard even though these spool quickly, the boost comes on smoother than say a precision? Not sure if this was just here-say, or if it was actually possible.

If I were to do it all over again, I would use an EFR twinscroll setup, but with the external WG setup. I do not like how their internal gates have the same inherent issues that normal internal gates have of spiking to max boost and tapering off. I would like better boost control than that on that quality of a setup.

rbsjnh · Dec 23, 2012

The transient response is similar to a blower. It's need to see the way it plots when you go back and forth of throttle. No lag.

Peardrax · Dec 23, 2012

^^ have heard of more than one person that has blown up their EFR, like literally came apart... I take it that has not been your experience..?

Any boosted road course k20's?

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