4AGTE Head Setups

[jeffro ra28]

"Toyota Levin 7agte 20v 330kw atw @27psi"

That seams impressive enough to me to warrant it.

[Bazda]

You wouldn't happen to have the flow rates for a bigport and/or silvertop would you?

I have someone elses flow charts for the silvertop but their readings are different, must of used a different type of flow bench i'm assuming.
But it does compare the silvertop to the small port.

The silvertop flows slightly better than the small port does. So its basically inbetween the small port and blacktop.

[KOV51]

hmm I dunno I think I have done so much modding already Im starting to get the feeling my project is going over my head lol

[charade_16v]

hmm I dunno I think I have done so much modding already Im starting to get the feeling my project is going over my head lol

Don't get down on urself, keep it alive!!
sometimes the rebuild task seams daunting, i know..
I think you need to speak to an engine builder directly who has done this kind of setup before.
Not sure about in your area, but in NSW there is:
Mick's Motorsport (Mick), who've done several 4agte's, reliably with big boost
Just Engine Management (Adam), done plenty and also drives a VERY QUICK 4agte ae86
HiTech Modifications (Matt), doing my setup at the moment, very knowledgable on 4A's and turbocharging basically anything...haha

Hope this helps, just don't want you to be confused by so many people saying different things, when u just need to speak to people who have done it before, so you can know what u NEED to achieve what you WANT.

Cheers, KEEP IT UP!
Mark M

[Sam_Q]

Starfire: the silvertop and blacktop VVT operations are identical, only one is reported to have 5 degrees less movement in the VVT pulley. Any ecu with an rpm switched output would be fine to run it which is just about every one made in the last 10 years. This is a common misconception.

Bazda: Heres some combustion chamber figures, the only one I can tottaly gaurentee is the BT one however the 16V one is commonly agreed upon, can you back this up 30psi 4agte?

ST: 35cc (arias)
BT: 37.8cc (me)
16V: 39cc

I can work out the theoretical comp changes for anyone who wants it for any given block/gasket/head/piston combo.


KOV51: I have had this feeling so many times, I find that it helps to just leave it alone for a little while and then go back over the info thats given to work it out, repeat as many times as needed.

Also I dont know if it makes much of a difference but the spool rods are very light compared to the black and silvertop rods.

[30psi 4agte]

My 16v head cc'd at 38cc from memory.

I must be honest and say i wasnt too concerned about the overall size of the chamber more so that they were all the same.

[Sam_Q]

and fair enough too, thanks for the info