[CLToy]

Love the idea but do you think it's possible that you may lose spool by going to larger piping? Another thought process is if the headwork offsets the spool differences by the shear volume difference....volume is up but velocity may fall off a bit making spool time about the same? Just a thought....none the less there is more air flow, and not just by the guy typing this either! Haha

 

[williamb82]

I have considered it, but I have the i/c and piping already, not gonna buy new ones to suit the upgraded ct26. Ill buy a ebay t4 kit first. Honestly, I doubt the overall volume will be much different. Going from a stock mk3 i/c and 2in hard pipes with too many bends to stock intake mani to a 24x12x4 i/c with 3in pipes and a ffim. Piping length will be reduced by several feet, and way less bends.

 

[racerxj220]

No difference you'll notice. Nice work.

 

[williamb82]

Too many changes being made at once, so not likely gonna be able to tell how much any of them made individually. Didn't get to work on the head this weekend. May be assembling Dans 6mgte next weekend. Ill have to see how things go. I did get my brand new oil pump Friday though.

 

[raysupra]

I have 2.5" IC piping and feel its perfect.. with the bigger Q45 throttlebody and aftermarket intake and deleted ISCV It takes a little tweaking to make it happy.
I have heard of running 3" coldside intake piping to create a Vaccum effect. I've contemplated doing before. I dont feel like you'll notice 3" intake too much but it does take little longer to fill all the new volume. also depends on TB/intake setup. I've always liked it as small as possible, better respone. but bigger IC piping never killed it.. just TB/intake size really makes a difference

Your setup will feel fine.. if you ever want it to be any more responsive.. which I wouldn't worry about it change your hotside to 2.5"

 

[williamb82]

Well, I plan on a bw 91-79, which has a 3in outlet, which is why I bought the 3in piping. Who knows, if I find a steal on a 7m t4 mani, might just go ahead and get the turbo and run it on the 7m till the 2j is done.

 

[racerxj220]

If you upgrade pipes, unless the motor is ingesting more air, there's not going to be any noticed feeling. This means the VE has to change at all conditions.

Creating a vacuum effect with IC piping?

Could you please provide documentation/evidence for this? That sounds interesting

 

[williamb82]

Well the VE of my engine will increase under all conditions due to the porting, fresh ring seal, new ffim with 75mm tb, shorter intake routing, less restriction on the intake while under vacuum due to the larger tb and piping etc... Plus I plan to run more boost. I was stuck at 19psi on the old setup, whether that was just the spring on the actuator is old and worn out, or whether there was a boost leak somewhere that will no longer be present, I figure on ~25psi on the upgraded ct26 I have, even if I have to buy a new wastegate actuator.

 

[raysupra]

If you upgrade pipes, unless the motor is ingesting more air, there's not going to be any noticed feeling. This means the VE has to change at all conditions.

Creating a vacuum effect with IC piping?

Could you please provide documentation/evidence for this? That sounds interesting

I could dig around I guess? but I just nabbed the "theory" from the big dog builders on the Mkiv forums
If just common Science I guess though.. things in pressure will flow to the area of least resistance.. and 2.5" hotside to a 3" cold side is pretty much that

when a intake plenum a TB are bigger than stock, it can have a slight surge effect at first takeoff. until its tweaked or tuned out.. and ISCV helps with that alot.

 

[KajunKreations]

What about the 8.8 diff you were fitting? Did you ever complete that project?

 

[williamb82]

No, it is not complete, but will still happen. Diff and the inner and outers for the CV's are all sitting in the garage.

 

[williamb82]

Well, long over due for an update. been collecting parts. Hopefully I will have a shed out back and can then get the garage cleaned out and move the 84 in thee to start working on it again. For now, heres some of the items I picked up.

OS Giken triple plate clutch with alteration kit.

Stainless MK3 divorced downpipe. Gonna weld a 3in vband flange on it and put a divider on the turbo flange to separate the turbine and wastegate flow.

Crown front hubs with rotors for my 5 lug swap. Now have 2 pairs of front hubs.

KYB AGX shocks for the rear.

ARP rod cap bolts for the 7mgte rebuild.

Brand new Cressida 7m AISIN oil pump for the 7mgte rebuild.

Fittings so I can run a 5/8ths hard line from the oil pump to block, and 10an out of the block and into the main galley. Should make routing the ss lines to the oil filter relocation and oil cooler easier.

Short throw shifter for the R154.

Prolly more stuff I have forgotten about. I will get better pics once my garage is cleaned up and is again a workable space.

 

[CLToy]

Life to the build thread!!! ....guess I shouldn't cast the first stone....I am behind on my updates too. Hope you get situated.

 

[drjim]

You're behind?

Geesh....I'm waaaay behind! I had a really bad flu/virus/cold, and it knocked the stuffing out of me for almost a month.

At least the weather is nicer now (not as cold and rainy), so I'll be able to get back to working on mine again.

- Jim

 

[gamble]

Oh nice, is that the os giken that was in the raptor clearance section for awhile? I kept eyeballing that thing for awhile, luckily someone else beat me to it.

 

[williamb82]

Well, got some more parts. 80mm Throttle body, Two 44mm wastegates, Two 50mm BOV"s, and another set of adjustable cam gears. Probably will mod this second set for a 5m/6m.

The 80mm TB is actually of really good quality.

Q45 TPS adapter it came with

Throttle plate is on some good sized bearings.

Toyota 2JZ TPS mounts to the ring perfectly.

O-Ring seal to the TB flange.

TPS adapter I made. Fits the Q45 center piece. Requires longer spacers and bolts for the ring. I am going to make another one to fit right on the throttle shaft to keep the TPS closer to the TB.

Toyota TPS mounted to the ring with the longer spacers.

View of the adapter installed. Set screw is not tight. The Q45 piece can be clocked in any direction as the throttle shaft has no flat spot, so put the set screw 90deg from the dowels on purpose.

And of course my favorite mod so far, my new co-pilot Deidra!

 

[SupraFiend]

Nice! I did the baby mod too. Mines 1 and half now, old enough to go romping at the wreckers with dad I figured lol. Had him with me this weekend, he had tons of fun at the wreckers!

 

[williamb82]

Oh yeah, somehow I forgot to post pics of this. I picked it up when I was grabbing another rear subframe setup. Price was too good to pass up. Going to use a dual port actuator on it, and sealant for the compressor cover since it isnt machined for an o-ring. May even look into having the exhaust wheel changed for one to provide better spool. Depends how it goes. Should make more power than the 57 trim I have on the 7mgte now.

 

[battleaxe]

how much boost are you planning to run to have 2 40mms?

 

[williamb82]

They are for my 2jzgte swap. I plan to run a BW 9179 in twin scroll. You have to have 2 wastegates for twin scroll. Boost will depend on power. If I build the motor as planned, 10:1 compression on e85, boost will be 25+psi.