What 4a-ge 20V turbo cam do you run?

[RT40Corona4AGTE]

well I am considering running meth for the strip, or atleast meth enrichment, what would it be like on high octane unleaded I wonder though for my occasional street runs...?

[fixeruperer]

vp have some nice oxygenated unleaded fuels out there but if your going to use meth, build your motor for it and run it all the time. meth is a bit of a job, because you always have to purge your motor after ever day of use.

so your licensing for the road ?

[RT40Corona4AGTE]

that is true about meth, I am tired and overlooked that aspect. lol

had a look at the vp fuels and yes they are very nice, so will stay away from meth I think.

Kelfords returned my email, they want some more info on my application so I gave them what they asked and it will be interesting to see what custom option they come up with. Will post their reply up on here once I get it.

and yes I am going to license it for the road, 4-link or no 4-link as that is the only thing I need to apply in writing for. Everything else is just mod-plated.

Any other thoughts?

[oldcorollas]

isn't Ed usign abotu 250@ 50 thou for his 10K rpm NA screamer??
and then you add in another 1-2000rpm or so capability due to turbo...

how hard do you reall want to spin it?

spool by 4000 is a big difference to spool by 6500
you could probably stop at 272 (230-235at50thou?) and get 9K+ potential

[RT40Corona4AGTE]

how hard do you reall want to spin it?

spool by 4000 is a big difference to spool by 6500
you could probably stop at 272 (230-235at50thou?) and get 9K+ potential

hard, but not too hard...lol

I know spool is a big thing and I am thinking of agreeing with you about stopping at 272 and retaining 9K+ potential.

Here is what kelford's replied to me with once I told them what my setup was:

Hell. That pore little 20v is gonna be revving...
O.k, The way we do it is we match up the intake lift to the valve size and flow, we match intake duration to the dynamic compression, cylinder size, turbo choice and rpm. Then we look at the spring requirement and make sure that the complete valvetrain is in control at your boost and rpm level. The exhaust lobe is designed by way of calculating how much 'time area' we need to evacuate the cylinder so that the engine dosn't nose over before the peak power potential has been reached. We can do this with duration to some extent bearing in mind that too much exhaust cam advance hurts midrange and slows the car down, so sometimes we have to compromise the duration and add lift to reduce the pumping losses. This is all pretty important and very relevant to the 20v because it has a very average exhaust port.
No other cam company you will talk to has a handle on this stuff like we do, they just do not know how. That is why we have the worlds fastest Japanese engine builders using our service and also the world's fastest MPH and E.T small block V8

[RT40Corona4AGTE]

anyone have any more thoughts on this topic? I still feel a bit in the dark here and I want to make the right decision.

[BLK_20v]

Bumping this topic cos i'm heading down this path and am unsure about what to use and look for others opinions as to what they have used and results they got.

If it matters my build is a 1.8L instead of 1.6 but using a blacktop 20v head.

[SHEPPO3930]

are you going to retain the VVT? if so, this will limit how big the cams can be.

"sheldrake" had some cams in his silvertop 20v, made 230(ish)rwkw, and now he's going back to standard cams. maybe PM him in regards to what cams he had, and his reasons for going back to standard cams.

i'll be using standard cams in my silvertop turbo, but i'm only aiming for 160-180rwk.

[RT40Corona4AGTE]

BLK_20V - get in touch with SamQ regarding cams.

[BLK_20v]

Yeah pretty certain i'll be retaining vvt... thinking around 270 or there abouts will be good.

[beerhead]

Had some work done at Tighe Cam's recently, they know there stuff. When I asked about the max lift on Gen2 shimless buckets his comment was that they run up to 12mm lift on tiny 20V buckets. I can go 13+mm on stock diam shimless buckets on a 3S.

You need to machine some of the aluminum around the top buckets so that the cam doesn't interfere with the head on Silvertop heads (blacktop have the room).

Remember with a boosted motor you don't need crazy lift to increase the charge volume. Once that turbo is on song, the charge volume goes through the roof. By not going too far with the lift and duration, you've got bottom end torque and faster spool times.

Have you got any access to dyno simulator software like dyno2000? I'd be experimenting with cam duration and lift to see what happens to the mid range torque and try and match the turbo compressor efficiency with the peak power point of the motor.

Pity my old Hard drive crapped out!! I had about 15 simulations with variations Tighe grinds and turbo compressor maps... for 20V's 3S's 2J's and RB26's.

[RT40Corona4AGTE]

thanks for the info beerhead, this thread has been revived it seems

[Shifty]

I think you're making this harder than it needs to be.

Plenty of examples of 400hp atw with stock 20v cams. Run the stockers, save the money, see what the dyno operator says about the engine's abiligty to take timing/boost & if this is a problem consider the potential impact on effective CR of the smaller cams. From all reports the stock ones breathe fine.

[fandio]

Nothing wrong with the stock cams, I run standard cams and 17 psi on my blacktop making 220kw atw. There is massive gains in the midrange keeping the vvt on a turbo setup