Thread: Thoughts on a full race motor setup (Turbo Posts)

This started out as discussion in the NA section, but stemmed went into a turbo discussion too. I am moving the turbo parts out and copying posts that are relevant for both worlds. - Vadim

Original NA Thread

No one here at the shop believes that the VE head flows over 230cfm. I showed them Daxx's flow bench results and he said BS. I told him stock K series motors do just under 300cfm stock and they all told me the VE isn't a K series lol.

A fully worked 2jz head flows around 240cfm! But it still made 917whp tonight

coheed, i just recently tuned a rsx with a gt30r on it, .63 turbine, stock motor otherwise. 438whp, 323tq at 1 bar. not reving past 8000rpms. this power is mostly obtained because of the higher flowing cylinder head and yes, the vtc gear.

turbochargers create air flow and they flow at diffrent rates at different pressure ratios. you must also remember that pressure is only restriction to flow. when port your cylinder head in a turbo build u are gaining power in ways more than just allowing more air to flow into the motor.

as for the larger valves on stock seats... mot all ve heads are equal. some sr16ve heads actually have 28mm exhaust valves. some ve heads have the same exhaust valve seat as the det and will support a 31mm valve if the valve job is done correctly. going 1mm over on the stock intake seats is not good because u can not get a full valve grind on the top half of the seat through the transition to the combustion chamber. this is a situation where .5mm over sitting a little higher up on the seat will be your best gain.

coheed, how much psi are you running in you current setup? is there a reason you are using the .63 housing?

-Ted

great thread here, and great info mrslappy

as you have had a bit of experience with the ve heads, i wonder if you could post the differences between them and what years have the attributes, as i did not know that some 16ve heads had 28mm valves

Valve sizes on VE heads that I have seen. I have seen many VE heads but I have not checked that many of them.

SR20VE and SR16VE In 34mm and Ex 29mm

SR16VE N1 33.6mm and Ex 29mm

I got 34mm and 29mm on my sr16ve head. My sr20VE head was the same. I am using the .63 housing because I wanted quicker spool. I didn't expect to get reversion on the stock cams with this turbo, to be honest it was the last thing I expected.

The K20 was obviously using a long runner manifold, not a log style like I am. I am expecting a lot of power to free up with the new manifold going on. I may even try a bigger turbo, because I can put down about 500whp on the 70cc injectors uncorrected, which is around 580 corrected. If I had a bigger turbo I could actually make use of the VE head.

That's weird that you are making that power on a stock motor, obviously not pump gas. The most my friend made on his k20 without the Kpro seeing knock was 280whp on 6psi. I believe you can make 500whp on the K motor, but you will need a lot better fuel than I am using. If I were on Q16 I would have made a lot more power.

Coheed I have seen 500 WHP at 18 PSI on a stock K20 motor a few times.

Most of the guys that run turbo K20 motors at 15 PSI are around 450 WHP and thats on 93 octane stock bottom end.

Wow, that is nuts. We tried running 12psi on the EP3 we turbocharged and it wouldn't push any more boost than that. This was a k20A3, with lower compression than the A2. We swapped in a K24 and had that boosted and we still couldn't push more than 10psi without it knocking all over the place. But all we got up here is 91, but we got courtney green to tune everything so I expected to see some numbers out of these.

If you guys are getting that much power on that high of boost on a 11:1 motor on only 93 octane, that is incredible. What keeps these things from detonation?

I have nothing to do with these motors making that power. These are people and friends I know who are into Hondas doing this. Trust me this is nothing special for them