RB20DET Tuning options

[Bigchuckers]

81mm pistons..... from a Toyota 4AGZE

What does the compression ratio come out to be on the RB20? Also what year(s) piston's would these be? The old mid-80's?

Thanks!

[superclarkey]

superclarkey

Would you be able to do me a favour whilst you have the RB20 in bits....

Can you measure the RB20 conrod length for me?

I will do as soon as i get time to do the bottom end :thumbs:

[boostn32]

watching with great interest guys, i am keen on building a RB24 the only thing stopping me is the head is so small. what head was used on the car that ran a 9 in japan.

[R31 POWER]

Any more work been done on the donk?I'm very interested.

[Butler]

sounds like it will be a killer engine. More revvy than an rb26 and with more torque than an rb25!! very interested to see how it turns out. Are you using an r33 gearbox? cause the r32 one is just going to go POP! Also let us know what cams u go and if u convert to solid lifters

[superclarkey]

Basicly i've learnt how slow things go when you've got such big plans on the build, its taking ages to get parts, don't helping being in uk

What will the gearbox's take??

I could do with something that can take 400bhp clutch kicks

[Turbine]

I'm joining in on this one guys. I want to stretch this little 2.0L engines wings as much as I can, using as many stock parts as posible.(it means I dont have S**t loads of money).

I have my turbochargers exhaust housing being modified at the minute. It's a T3 flange .63AR. What I did was bore into the scroll area in line with the direction of the airflow into the turbine, just before it turns the corner. This is where the external wastegate goes.

This way the airflow doent have to turn a corner to escape out to atmoshpere.

I'll have pics soon

Turbine

[Butler]

What will the gearbox's take??

I could do with something that can take 400bhp clutch kicks

haha well the rb20 box wont last long doin those kinda stunts! especially with the extra torque of the 2.4L. Would strongly suggest beefing up clutch and upgrading to an r33 gearbox (they can handle upto ~400KW maybe more), they are basically a gtr box without the transfer case

[Roy]

I wouldnt spend the money on the g'box if it is still running ok, wait til/if it breaks. Mine is hanging in there, for a week or two it felt a bit ordinary after a fluid change but 1,000kms later it has come good, mind you that only 2.0L and less only 215-235rwkws...but spend the money on a kick ass clutch for the RB20 box, then when ithe box goes get the RB25, the few months you get out of the std box will lwt the bank account recover:)

[skylinechef]

iM REALLY KEEN TO FIND OUT THE CONROD SIZE FOR A RB20DET WANTING TO KNOW IF THERE IS ANY DIFFERENCE BETWEEN A TURBO AND NON TURBO ROD

[superclarkey]

Well i'm not going to buy a massively expensive clutch to have to change it for another box

So i'm going to have to sell the GTs box and get a GTSR33 box, could someone tell me do they fit the same?

[superclarkey]

BTW wanted to ask, i was thinking about it today if i change the storke of my engine does it change the compression ratio?? why yes it does.

Stock Bore and strok is 78mm x 69.7mm and the new bore and stroke is 82mm X 73.7mm.

THe stock compression ratio is 8.5:1

Anyone fancy working out the new CR, i bet other people don't bother with this but i bet its going to be easly in the mid 9:1's

[superclarkey]

OK first off sorry about 3 posts in a row, you should be replying bitches lol

I've just sent the order form off too TOMEI for the parts :cry:

I was saving this money for a holiday you know guys, lol

Tomei bit:

82mm Pistons for RB24DET

1.8mm head gasket 83.5mm ø

valve springs (soild type)

Soild lifters + adjuster shims

Timing belt

PROCAMs + pulleys (solid type)

£2500 spent at 3am in the morning, i'm going to wake up tomorrow and this will all just be a dream i hope.

Tis going to be a beast

P/s i need to know, does the GTR oil pump fit the RB20? is it a good upgrade if so? also water pump?

[RBsileighty]

Whatever happened with this build? Any updates?