Jump to content
SAU Community

R34 Gtr Build

JEM Dyno
 Share

Recommended Posts

bigmikespec Veteran

bigmikespec

Posted
Posted

ID2000 because of the volume of fuel at high rpm will not atomize properly, by having it further away from the intake valve you allow the fuel/air mixture more time to mix properly and enter the chamber. Proven that is makes more power at higher rpm having the injectors further away.

  • Replies 842
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

BakemonoRicer
BakemonoRicer

Meh....the reality is that the car must have fallen short of expectations Really not sure how a full tune can drag out for 2 years... so claims that the build was f1 spec, just musn't show on the dyn

BOBBYr34
BOBBYr34

This build has not finished, alot more to come and i will try to update it on here and facebook. currently waiting on motec for a revised Gpr package to run the Hi lo injection properly and also need

Mick_o
Mick_o

Seen it being fanged on the street obviously its come off the rollers. Post a sheet! Give us some numbers mate ?

Posted Images

BOBBYr34 Experienced

BOBBYr34

Posted
Posted

We will have both blanks running under full load and both banks running full sequential.

Yes if it was me id just run the one injector ie ID2000's. Well i remember about 2 years ago when i said to John can we just run the one injector,one large one. John went into great detail and expained injector frequency can run one cycle out of phase im not sure what that means and he said this is why we run two bank to cover up the out of phase injector.

I guess whats in Johns head is a greater understand in full detail how this whole buid is going to work.

Spray pattern is extremly important Vs Fuel Pressure you can bump fuel pressure and have the injectors spray like a hose in full liquid form, this is a mistake made by many people. This can lead to detenation caused by bad air fuel mixing.

Raysboostin Mentor

Raysboostin

Posted
Posted

A big high flowing injector will not atomise the fuel very well, hence placing it further away from the intake port will increase atmosation as it travels to the inlet valve... try putting an injector at 90°to the port and see how you go!

Wouldnt poor atomisation be caused by using the incorrect spray pattern and fuel pressure?? Especially in a boosted application?? I understand that a larger injector would be harder to get perfect atomisiation. but if its the correct injector with the correct spray pattern for the application, setup at the correct pressure wouldnt the angle of the injector cause minimal issues with atomisation?? Could you expand on it a little?? Sorry for the off topic chatter bobby.

bigmikespec Veteran

bigmikespec

Posted
Posted

Wouldnt poor atomisation be caused by using the incorrect spray pattern and fuel pressure?? Especially in a boosted application?? I understand that a larger injector would be harder to get perfect atomisiation. but if its the correct injector with the correct spray pattern for the application, setup at the correct pressure wouldnt the angle of the injector cause minimal issues with atomisation?? Could you expand on it a little?? Sorry for the off topic chatter bobby.

Think about where they place injectors in F1... right outside the trumpet of the inlet parallel to the inlet port.

Raysboostin Mentor

Raysboostin

Posted
Posted

Think about where they place injectors in F1... right outside the trumpet of the inlet parallel to the inlet port.

Thats all well and good but it doesnt answer my question. I understand that where F1 cars have them is ideal placement. But in real cars u cant always have ideal placement. Ive seen some old collectable cars with efi conversions that had the injector hidden under the manifold. The injectors would have been mounted at a 90deg angle at the least. Obviously a high performance application will be different, But im trying to understand more of the science behind it.

BOBBYr34 Experienced

BOBBYr34

Posted
Posted

I was at John's Workshop and I found some paper work related to the build. Its very interesting how much details John has gone into with his calculations. This was done back in 2008 and he has box loads of it.

I guess it would be a mission to post each page. Well I managed to get some pics of the paper work i know to some people it wont mean much however to some its priceless.

Enjoy

post-49633-0-37897500-1328618846_thumb.jpg

post-49633-0-75514700-1328618899_thumb.jpg

post-49633-0-08539100-1328619029_thumb.jpg

post-49633-0-76211500-1328619116_thumb.jpg

post-49633-0-97343400-1328619155_thumb.jpg

post-49633-0-34119300-1328619207_thumb.jpg

post-49633-0-70981600-1328619298_thumb.jpg

GTRNUR Grand Master

GTRNUR

Posted
Posted

Makes my head hurt doing that kind of maths! Someone should teach John how to use MS Excel. Im sure he could then create the mother of all engine calc spreadsheets.

I noticed the mentioning of a water/meth injection system too. As your already running with 12 injectors, where will you be putting the injector nozzles? Just after the BOV's and before the plenum, or are you modifying the plenum further to support direct port injection as well?

BOBBYr34 Experienced

BOBBYr34

Posted
Posted

Makes my head hurt doing that kind of maths! Someone should teach John how to use MS Excel. Im sure he could then create the mother of all engine calc spreadsheets.

I noticed the mentioning of a water/meth injection system too. As your already running with 12 injectors, where will you be putting the injector nozzles? Just after the BOV's and before the plenum, or are you modifying the plenum further to support direct port injection as well?

Hey Ian,

John can not go near a computer i have tried many times they just die everytime he touches them. Yes the calculations are done for everything on and in the motor.

The water methanol injection nozzel will be placed infront of the turbo. John has said this will help cool the charge and increase the pressure ratio of the turbo as you now are compressing air with liquid vapour ( density increase = higher turbo pressure ratio).

I will be using a snow performace setup that will be modified.

ezy_09s Proficient

ezy_09s

Posted
Posted

Cant wait to see the final results on this build Bobby..its awesome to see this level of detail , custom fabrication , not to mention the dollar amount.thumbsup.gif

I hope this can really achieve everything your hoping for..look forward to the next installments.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • PranK
      New Skyline will be RWD and manual

      By PranK · Posted

    • GTSBoy
      Nismo GT Pro LSD configurations

      By GTSBoy · Posted

      No, you're wrong, and you've always been wrong about this. The Nismo has 2 sets of openings. One is a real 2-way, and the other is a 1-way. There is no 1.5-way possible with the ramps that they offer. A real 1.5-way does exist. That Cusco stuff I posted is a prime example. If the forward drive ramps are, say 55°, and the overrun ramps are, say, 30°, then you will get about half as much LSD effect on overrun than you do on drive. It is real, it realy works. OK, you're slightly right. The Nismo has 55° and 45° ramps on the 2-way, so it does offer less LSD effect on overrun. But, I think that just means that they've (probably) sensibly established that you do not want actually equal LSD effect on overrun. You just want "quite a lot, but not quite as much as the drive LSD effect".
    • DraftySquash
      Newbie from VIC

      By DraftySquash · Posted

      Just wanted to unearth this and post my baby with the new front ❤️😝 Took her to my wedding rehearsal today. Next up is getting wide skirts (after wedding)
    • Kinkstaah
      Nismo GT Pro LSD configurations

      By Kinkstaah · Posted

      Yea, that is what I was getting at in my ramblings too. The nismo one actually is a 1.5 way and a 1 way. They don't do a *2* way because a true *2* way would have equal ramp angles. Or is that a true 1.5 way? Realistically I think a "1.5 way" does not actually exist. A diff can either lock in two directions or one. It also doesn't help that a LOT of people in Australia speak about 1.5 way diffs are referring to their 1 way diff.
    • GTSBoy
      Nismo GT Pro LSD configurations

      By GTSBoy · Posted

      Well, the trouble with that ^^ is: The configuration shown is absolutely a 1-way, not a 1.5-way. There is no way that a 1.5-way can be said to offer LSD action only on acceleration. If Nismo cannot get that right, then it is impossible to believe their documentation. That ^ is not a 1.5 way setup. That is a 1-way.   And so now I have allowed all doubts to flourish and have gone back to look at the MotoIQ video. I originally made the mistake of believing him when he said "this is a 1.5-way" at the ~6:10 mark. Because what he did was take the gear assembly out of the 2-way opening and just rotate it one place to the left to drop it into the 1-way opening. When he dropped it in there, the cam was "backwards" compared to the correct orientation shown in all other photos of that config. The flat shold have been facing the 1° ramp side of the opening, not the 55° ramp side. And I thought, "gee that's cute", but I was concerned at the time, when he put the other ring back on, that the gap between the rings looked like it was wider then in the 2-way config. And then I said a lot of things in my long post on Tuesday that could only make sense if the guy from MotoIQ was correct about what he'd done. BUT... I have now done my homework. I grabbed a frame of the video with the 2-way config, and then grabbed another with the "1.5-way" config, snipped out the cam and opening of that frame and just pasted it direct on top of the 2-way config. I scaled it so that the triangular opening was almost exactly the same height in both. AND.... the gap between the plates is wider with the cam installed in the triangualr opening backwards. That is.... it cannot go together that way. There would be massive force on the plates all the time, if you could even reassemble it.  So, My statement on the matter? The Nismo diff is actually only a 2-way and 1-way. There is no 1.5-way option in it, regardless of what they say. Here's a photo of a real 1.5-way ramp opening from Cusco (along with the 1 way option). And the full set of 1 through 2 way options from their racing diff, which is not same-same as what we'd typically be using, but...the cams work the same. A little blurry, but it comes from this Cusco doc, which is quite helpful. AND.... Cusco do in fact do what I suggested would be sensible, which is to have rings that do 1 and 1.5, and 1.5 and 2. Separately.  
×
×
  • Create New...