Tomei Arms M7655 On Rb26

[XKLABA]

aaww poo, i guess the trust ones then, cause i know they work good

[R31Nismoid]

yeah i got the dyno sheet ill load it tomoz

I hear they are almost 2000rpm laggier than -5s?

Dyno sheet?

[GTR 70Y]

I hear they are almost 2000rpm laggier than -5s?

Dyno sheet?

http://s1206.photobucket.com/albums/bb446/nismoboy_r34/?action=view&current=IMG_0835-1.jpg&t=1315813508740

it doesnt drop off boost at the end, the cooler piping pops off.. not sure what the -5s do but im sure its not 2000 rpm slower there pretty much on full boost at 5600

[GTR 70Y]

sorry bout quality scanner didnt work so i had to take a photo of ittried to zoom in as much as possible

Edited September 12, 2011 by GTR 70Y

[N1GTR]

Bit easier;

[R.3.2.G.T.R]

http://s1206.photobucket.com/albums/bb446/nismoboy_r34/?action=view&current=IMG_0835-1.jpg&t=1315813508740

it doesnt drop off boost at the end, the cooler piping pops off.. not sure what the -5s do but im sure its not 2000 rpm slower there pretty much on full boost at 5600

full boost around 5900, with cam gears, was the poncams dialled in as well, still laggy for the street imho

[R31Nismoid]

http://s1206.photobucket.com/albums/bb446/nismoboy_r34/?action=view&current=IMG_0835-1.jpg&t=1315813508740

it doesnt drop off boost at the end, the cooler piping pops off.. not sure what the -5s do but im sure its not 2000 rpm slower there pretty much on full boost at 5600

Going off the graph its 6000rpm.

That's worse than GTRS which are what, 150-200 more?

Can tell you now if its not 2000rpm, its not much less for -5s

[SimonR32]

15psi @ 5200rpm ewwwwwwwwww

[cortexx]

Hi , Signed up an account to replay to this thread

I have an R33 GTR with these turbos and have had them running for aorund 8000klm now .

a couple of things to know :-

mine had to be run in for about 1-1500klm because of the bearing type

Use a thinner oil for the engine , i use 10w30 redline - many use alot thicker oil and this will make a big difference to turbo lag with drag on the bearings.

Use the factory manifolds unless you have other mods which need otherwise. The manifold to turbo flange is smaller on the factory units increasing gas veocity into the exhaust side of the turbos making them spool at lower rpm . The expreme setup has a larger opening which breaths better at higher rpm but reduces exhaust gas velocity at lower rpm- this makes a big difference with spool up at low rpm.

Use poncam b's , they increase duration of the opening of the exhaust valve by 5 degrees NOT lift - they are easy to install and increase exhaust gas pressure making a noticable difference. you dont need adjustable gears for this - they are pegged for stock cam gears . Adjustable gears are not really required for mild tuning like this.

Mine start to spool at 3200 rpm , have fully spooled up to 1bar at 4000 rpm and keep this steady until redline.

Im upgrading my fuel system and plenum this winter along with arp head studs and a cosworth head gasket so hoping for 1.2 bar next year reliably

Once everything is finished ill get a dyno sheet and post it up !

[Piggaz]

^ is that on a standard engine?

[R.3.2.G.T.R]

what plenum u looking at upgrading to? 1.2 bar on a stock 26 is common as with most -7/-9 setups, its around 300kw mark

[zebra]

7655 sounds a lot like garret gt2876

Going to jump on the computer in a min. Will confirm wheel sizes then

edit - 68mm comp exducer 6/6 blade wheel and 56mm turbine wheel with 12 blades

and according to tomei still journal bearing

So to me and my quick look around, they are a TD05-20G in custom housings

[GTR260]

I've decided to pull mine off and change to a single turbo set up! They are advertised in the for sale section if anyone is interested,

I never turned them up, on 12psi they started making boost at 3200rpm & were agressive once on 12psi at 4000rpm.

[zebra]

and surprise surprise, the ARMS8260's look to be a TD06H turbine wheel with possibly a Garrett GT 76.2mm comp wheel (its isnt a 25G wheel as they are 78mm)

[bigmikespec]

and surprise surprise, the ARMS8260's look to be a TD06H turbine wheel with possibly a Garrett GT 76.2mm comp wheel (its isnt a 25G wheel as they are 78mm)

You clever bugger, you seem to be right about them using MHI parts. So all they have done for these turbos is add custom housings and mix/match MHI/Garrett parts.

[Ryan1200]

and surprise surprise, the ARMS8260's look to be a TD06H turbine wheel with possibly a Garrett GT 76.2mm comp wheel (its isnt a 25G wheel as they are 78mm)

A forum member on Club high rollers EZYWIN has the above turbo's his doing back to back testing from -5 this week according to his forum update. Pretty sure it made 530awhp on E85 -5 tuned by godzilla motorsports.. Lets hope for something a little more impressive than the smaller tomei turbo's.

[zebra]

It would want to make 1000hp with those wheels in the turbos.

It wont though. Turbine housing will choke it, just like the HKS GTR spec GT2835s

[R31Nismoid]

Use a thinner oil for the engine , i use 10w30 redline - many use alot thicker oil and this will make a big difference to turbo lag with drag on the bearings.

Have you had 50 or 60 in it? How much effect was it having?

I certainly wouldn't be going that thin (on hot) with a RB26. Least of all just to help crud turbo's spool.

[Ryan1200]

Update from CHR:

First things first. Thankyou to GODZILLA MOTORSPORT, Mark and Darren for there on going passion to my car and the overtime they have spent on EZYWIN. Well those Tomie turbo's Kick Arse and make power. First Dyno Run 530hp @ 17psi at all 4's, that power equals the power i had with the garrett -5's set up with 24 psi. So we made just over 600 at 25 psi. Happy figure at 595 @ 24 psi. So there is a little down side LAG 5000 rpm then Hello. Went for my first drive today and oooo mummaaa powerplay and willowbank here i come. Tomie quality a big yes.

[R31Nismoid]

So that's two sets taking until 5000rpm to come on.

And that is with E85 Ryan?