MBS206

Any update on vids Ben?

That's how I looked at the build was if I wanted 11:1 i'd need rods, which to me meant a whole motor build. At the moment everything on thi. Car has all been about bargain hunting really. And from 1000cc to 1600cc there isn't much price difference. I'll do some calcs late tonight if I can get my ecu to let me download it and get the dc of the 880 injectors. At 3500 this motor feels dead as a door nail, but it's making 190 rwkw. But at 5000 rpm plus it's making 250rwkw which accelerates 5 times faster... Dyno definitely didn't read my full power read out properly... I think I'd max a 1000cc set, or at least be chewing into the safety area... Watch this space though, big changes to setup before next texi!!!

It's nearly worth me NOT paying rego, paying for the roll cage instead, and getting it cams log booked...

Do it yourself. that way there is no one to blame if it f**ks up.

The issue I've been warned of is even on E85, with 11:1, the compression in the motor could quite likely bend a rod. But then I've heard some euro cars are coming out on 98 fuel with 10.5:1 CR so... More reading needed... That and I've been told to run alot larger injectors and up the whole fuel system... From what I've been told is to look for 1600CC injectors, and twin 044s feeding the fuel rail from a surge, and a single 044 feeding the surge tank with larger lines from surge tank to injectors. For now it's looking like I'll be throwing another 30DE bottom end in with a turbo more suited for track work, and holding off a little on the 11:1 and E85 transformation. But I will be playing with going unassisted brakes, and a full engine bay tidy up whilst the engine is out, along with a few other little changes...

QFT! ROFL You keep giving me inspiration... The poor new garage I'm moving too isn't going to know what hits it when my car gets there... (And it's a brand new garage+house... LOL...) I need to rework my dash a bit too, looking at some custom shit around the factory speedo/alternator.

Nearly everyone with a 25DE has found them to be soft. I have a set of 25DET springs in my room, when I pull the head off my 30 I'll compare the springs from the 25DE head to them. Edit; And when I checked with the guy at Nissan he mentioned different part numbers for them. 26DETT should DEFINITELY have different valve springs.

I run an R33 RB25DE head, valve floats about 6500RPM with 1 Bar of boost on my turbo (Big mean mother trucker). I also run the R33 25DE cams, the car "makes" 250RWKW... BUT this was on a dyno there was complaints the following day of ultra low readings, add to the fact no matter what we did it wouldn't stop wheel spinning above 5000RPM...

Put the MX5 on and see if it makes 75% of the power it should be...

If you're running a 25DE head, make sure you change the valve springs as the 25DE springs are soft, and do not like boost.

For your claimed power, you should be running mid/high 12s... 190 - 200RWKW is seeing consistent 12.9s from people.

Coolant doesn't move. I've been told by numerous people it's oil. When it does any one standing around smells burning oil. It's blue but not super blue like when a magna/excel takes off with stuffed rings.

Jess complete noobie for this kind of stuff. Just sent app via email. Matt Sullivan.

A GTS-t is that light, not a GTS4. And commodores are way lighter then 1551KG. PS: take it to a drag strip and find out.

They create load affectively the same way, but because the wheel is gone, the power reading is not "At the wheels" but "At the hub" as it takes energy to get the tyres going which is then free when only measuring at the hub.

Where is your oil pick up? You say external pump, but is the external pump still using the stock pick up? If it is, is the sump gated and baffled?

The turbo at 1 Bar makes this tihng lay sideways coming on boost in 3rd... Which is around 130KM/H... That's with semis on as well! Yep... It's definitely beyond my ability! LOL But... It does good skids! LOL Edit: And Duncan, definitely does seat time + instruction improve driving 10 fold! That Texi day was one of the most fun days I've had in ages, and learnt so much. I was so glad I took the liner there for it's first locked diff outing. Edit: And I'm off to find out some info from those running E85...

The thoughts of NA were mainly because going to a newer, better designed more efficient (better matched) turbo, would cost alot more then N/A with some cheap new pistons added... That and the sound of 8500RPM with the shortest induction possible was going to be beautiful... But that may change... As I said, this is the drawing board stages right now.

Watch this space people... More crazy ideas to come... Like 11:1 CR with a turbo

That's an extremely tempting swap. You do realise how ridiculous this turbo is on the circuit and the smoke plumes it makes? (Was going to test it with a oil pressure regulator) to see if it could be avoided. We need to talk more in detail, I pmd you MSN details earlier if you have it?

What's your setup? I'm keen on swaps for something smaller so long as it's new new... Is your setup egay style or proper? The ole' high flow setup still runs out of puff about around 5000RPM. What I'd be looking at is something a TOUCH larger (If not the same size as) a GT3076R. But to change that is manifold, turbo, and dump. To me ~$3000 worth of change over...

Ha ha ha, I agree whole heartedly with you Duncan, I want nothing more then to keep the flutter BUT, is it not true, those who started small, in lower powered, worse handling cars and perservered generally learnt to go quicker then those who just throw money at a car? I'm chasing lap times, and want to do it by clean, fast driving, NOT throwing more power in. If I do 100% go an NA (There's a high likely hood) then I'll be selling the mani and turbo+wastegate for sure, and I'd love a 26 head... So I might just do that... Tempted to throw me an offer on it all?

It makes things start knocking. Do everything you can to avoid it, and don't try and "test" to see if it's cured... It's expensive if it isn't.

Sounds possible like exhaust gasket leak.

I WAS going to update my above post with some thoughts, BUT I can't edit it... So, I'm having VERY evil thoughts after Mr Zebra decided to point out, the 25DE slugs will bump my CR right up. Now the reason I'm thinking of turning NA, is it will make the car easier to learn to drive. IE, I'll learn to brake and corner alot better. Coupled with a 3.0L, 11:1 CR and some exhaust, and cam toying, I reckon I can get this thing to actually rocket along... Considering with the waste gate removed at Oran Park, I was still seeing speeds of ~175KM/H down the main straight, from memory Cass is only seeing around 170-180KM/H on the same straight. So that's my 3.0L with 8.3:1 CR, on a turbo system thats building no boost and tuned cop rich at atmospheric pressure... Now, I hear Duncan absolutely SCREAMING in agony at a GTS-t being turned NA... But keep with me. Build this engine, 11:1 CR, nice exhaust on it, learn to drive it, setup the suspension... When I need more power, that's easy... Turbo at around 1Bar of boost... Did a whole heap of people just scream again? But think about, cars USED to run 8:1 (And EVEN LOWER) CR for turbos... Now, a nice 9:1 and even higher is common (The MPS3 runs 9.5:1!!!) Why? Fuel has gotten better and so has tuning! So, give it 1 - 2 years from now. Fuel such as E85, is going to be more available (Hopefully pump available), and it is allowing guys to tune RB25DETs with 20+PSI of boost PAST maximum torque in ignition... What's that telling me? More boost, or higher CR is needed... If you can screw the engine to the limit, and not ping or detonate, even on "lean" mixtures, you're not taking the fuel to the edge. So, in 1 - 2 years, there'll be better turbos out, and I'll be able to pick one that will perfectly suit pushing even only 1 bar, on a 3L with high CR... Now you scream "WHAT ABOUT THE FUEL SYSTEM!" well... The car is already sitting there with 880CC injectors, over kill for an N/A, but perfect for E85 and 1Bar... When I redo this engine, I'll be adding a surge tank, so it'll be a perfect time to suss out running a proper fuel cell and what pumps to run as well (Currently on an 044). So... Thoughts people? Proper 6-3-1 tuned manifold, 11:1 CR with the ability to later on throw a good turbo setup on and really make it haul ass? I'm at the point where I HAVE to decide what to do with this motor and turbo...