R31DET 2nd stage!

[Bullet32]

Thats right folks, R31DET (the R31 you all know and love) is undergoing its 2nd stage of transformation!

The 1st stage being the R33 RB25DET and R33 Gearbox transplant, a few bolt on goodies such as exhaust (3"mandrel) and boost bleed valve etc...

But now, the finance is in the pipeline and there is a better than good chance that R31DET will recieve the following fruitful upgrades!>>>> (All input and thoughts welcome)>>>>

Step 1. Custom plenum with front mounted throttle (for less FMIC plumbing for better boost response and less lag).

Step 2. Custom 2.5" and 3" FMIC plumbing with Turbosmart Supersonic BOV (for that much loved high pressure gas release sound).

Step 3. Standard huffer sent to G.C.G Turbo's for ball bearing highflow (for that extra kick at somewhere around 4000rpm when boost hits 16psi).

Step 4. GTR injectors or bigger (for that extra juice to help avoid nasty detonation at high rpm).

Step 5. Differential rebuild with strengthened internals to suit 300 Rwkw (for that piece of mind when you dump the clutch in the boost range).

Step 6. Hr31 import front struts and R32GTR front discs and calipers (for that little thing called stopping power needed when you make extra go).

Step 7,8 and 9 tuning, tuning and more tuning to try and get as much power out of the standard (piggyback chipped) ecu as possible... (I cant afford a PowerFC yet)....

Im hoping for 220 Rwkw in the next few months, the money looks good and hopefully all systems are go very soon (fingers crossed)!

Whaddayareckonhuh? :crazy:

[Bluprint]

I reckon you need some wider mags & tyres, by your own admission it can't hold the power you have now

[leech_]

sounds good mick should be one quick beast when she's done not that it isnt already

[Amaru]

All sounds sweet

But being the picky bastard I am, im going to make a few suggestions

Step 4. GTR injectors or bigger

GTR injectors dont fit in the RB25. RB26 injectors are top feed, RB25 injectors are side feed. Check out greenline (www.greenline.jp), they have awesome prices on Sard injectors at the moment. Should be able to pick up a set of 600cc for a good price.

Also, youve made no mention of fuel pump? What pump is currently in the car? Maybe get a Bosch 040 to sit in tank just to make sure

I wouldnt really worry about the plenum, its been said many times on here its only really asthetic, or useful if you have a large turbo (read, T51/T88 etc) to remove some restriction where the pipe bends. The standard plenum has very equal distribution of air, if you change to a forward facing you will need individual control over the injectors to richen up cylinder 6 as it will run leaner than the front ones. Even the R31 bathurst cars kept sideways facing plenums

All that aside, sounds awesome

[LTSJayce]

Even the R31 bathurst cars kept sideways facing plenums

Ah,yes:Bathurst cars...

[Bullet32]

Yes, by my own admission, I will need wider wheels and tyres Mark, thats why when all of the mechanical work is done I will put the mags I have up for sale, then ill take a trip to Sydney to get a nice new set of 18x7's on the front and with a little luck 18x9's on the rear...

Thanks Leigh, I never knew that you actually do appreciate 31's!

Ill have a look into those injectors Nik, thanks, I am already running a Bosch 040 in the tank - I put it in for the 1st stage cos the RB30E pump doesnt flow enough for the RB25DET, I might need a fuel pressure reg though... I am going to use a custom plenum simply because I already have it, I got one along with mandrel plumbing and BOV for only $400 2 weeks ago.

Mabye ill run the engine abit rich to start with until I get an Injector controller (or programable ecu).

Gentleman Jim's Gibson race car --- Yummmmmmm that 31 was Horny!

[Jester]

Broom Broom go fast now, good. back in home country we turbo donkey.

[geordie]

Yeah, you may also try and source s15 sr20det injectors also, these are 480cc (more than the 440cc gtr) and are side feed and would suit your purpose.

Another plenum sugestion (although useless as you have one anywho) was the blitz adapter plate for gtr plenum, then you get 6 throttle bodys

[Frink]

GTR injectors dont fit in the RB25. RB26 injectors are top feed, RB25 injectors are side feed. Check out greenline (www.greenline.jp), they have awesome prices on Sard injectors at the moment. Should be able to pick up a set of 600cc for a good price.

there is a write up on these in the lastest SPEED magazine. you've got it dont ya? READ IT!!!

[leech_]

lol mick i appreciate the engine not the car j/ks

[race_snooze]

why send shit to GCG for $2000 they high flow, for $2000 you can get a brand new gt30 or 35 for that price, stuff GCG

[Abo Bob]

GCG highflow retail is $1950 SAU members get 10% off that. It basically is a GT30. If you go for for the Garrett version you will have to make some exhaust changes which may not cost heaps but wont be free.

Is 7 inch wide all you can fit in the 31? You will most likely get understeer issues with the 7's and 9's but you may only care about straight line performance. I get it with 8's and 9's (225's and 265's - part of my issue).

You can use a GTR regulator which will be cheaper but not adjustable.

I thought S13 suspension went well in R31's? Well sorted suspension will help with grip.

[Gus-]

sounds awsome mick.

[Bullet32]

Its pretty cramped under the front of an R31, I have been told by a few owners that the biggest you can get on the front are 7"s but Im not sure, I plan to do a bit more research on it when it comes to getting wheels.

I want it to be more of a "track" set up than just drag, I wanna go round corners quick too... But the suspension will be upgraded a bit further down the track as I can only get a certain amount of money for now.

What AboBob said Shawn... If you spend the $1750 that GCG quoted me for a ball bearing high flow, thats all you spend...

If you buy an after market turbine of around the same size there are things (like the maniflold) that you have to change, so the price adds up, and right now Im not looking to make the car stupidly powerful as it is still my daily driver.

[Frink]

hey guys,

im looking at buying a second hand T28 which is in reasonable condition im lead to believe (havent seen it yet). what would you reckon a good price for one is? this guy (a friend of a friend) has "floated" a price of around $700. i wanna get it for cheaper, then hi-flow it or exchange it. not planning on putting it in anytime soon, as im gonna do everything at once. just after some thoughts.

[Stevie]

Front throttle on "custom" read: cut and welded plenum makes your motor go boom boom! A Greddy (or other rep brands) front throttle plenum is actually designed to distribute the air in an even fashion. You wont get this out of your chop shop version.

I almost did this a while back but luckily did the research first!

Plus there is very little lost in one bend of the intercooler piping!

[djhatton]

Front throttle on "custom" read: cut and welded plenum makes your motor go boom boom! A Greddy (or other rep brands) front throttle plenum is actually designed to distribute the air in an even fashion. You wont get this out of your chop shop version.

I almost did this a while back but luckily did the research first!

Plus there is very little lost in one bend of the intercooler piping!

<{POST_SNAPBACK}>

custom plenums are perfectly fine if they're designed and built with a level of care and understanding. its the runners you don't want to be messing around with.

mick, all sounds good!!! can't wait to see her develop and evolve!!!

sing out while you're doing the work if you need someone to hold your beer when you need 2 hands!!!

d

[Bullet32]

Well I think Im going to have to sacrifice out right power for a more well rounded package, what I mean is... The turbo will have to wait, I recently dicovered that the suspension is more lacking that originaly thought, I will probably go more for the handling and stopping side of modifications and mabye do the turbo later down the track (bugger) oh well the things we do for our pride and joy!