Increasing redline on RB25

[theo]

Yes

[BU5TER]

damn thats good going, I seen the blue car a Syd Jamboree running Nitrous and Mickey Thompson ET Streets, he was running pretty damn consistant high 10's, what he do to the car to get it to run the same times on Nitto's and no Nitrous?

[nv033]

chucked a wreckhead possiibly (no offense ment... just a little personal joke)

[funkymonkey]

hey guys, arguments and c0cksize comparing aside... quick question:

I'm in the process of installing an RB25DET into my R32 GTS

I'm thinking of taking a slighly different approach to tuning the car, basically I want to reduce lag and increase the amount the car can rev up to.

To fix the lag i've gotten my grubby hands on a misfiring system, which should keep the turbo spooling while the throttle is off. To go with it I need to make the rev band larger. Mainly it'll be for track use, but it is a street car as well (when the misfiring system is switched off). So it needs to be responsive in lower RPMs (so I can shift at 4000RPM in day to day driving) and during track use needs to be responsive at higher RPMs.

I have access to a PFC and the laptop interface etc, so loading seperate fuel maps and timings on the fly is not a problem.

The system will run with a TD06-25G setup. I would like some reccomendations on what engine mods, timing mods, ignition and fuel supply mods need to be done to achieve what I'm after.

[Roy]

The 25G aint that bad a thing on the RB25 from what im told. I wouldnt be running antilag unless you have a cast steel manifold. Its hard on turbos, exhaust valves, gaskets and manifolds.

Lag is the time it takes to make boost when you have enough revs on board to realistically expect boost. My 20G isnt that laggy at all, it actually helps that little bit coming out of corners as it softens that hit of boost and aids traction. What can suck is the poor boost response which is why you may want an anti lag system. That comes back to wheel sizes and housing A/Rs

Id personally stay away from an anti lag setup, especially with a Trust turbo which with its bush bearing wont handle the abuse as well as a BB centre.

Im a fanboy of Bu5ters old setup, i never went for a drive in the car, but the numbers speak volumes for the turbo and cam selection. And a friend admits it was a better setup then his HKS setup with better response and more power

[funkymonkey]

cast steel mainfold? my manifolds made of cast iron... does that count?

well as for the misfire system, i've already got it, so I'll experiment with it. I was always under the impression that the fluctuation of boost was bad for the turbo and that a constant pressure on it was relatively healthy. If I don't like it the system is made such that you can flick a switch and turn it off Which means the misfire system is only gonna be used during spirited drives and track use.

[51jay]

Yo Theo You'd better check out HPI...they have got it wrong. The white car did 160rwkw minus the muffler at the Mercury Skylines shootout today....not bad for a stocky!

http://www.hpi.com.au/drag_records.php

[R31Nismoid]

This thread is funny, there seems to be a few ppl getting a little defensive / aggressive :argue:

yer, i agree.

Guys, have a discussion etc by all means. But stop having digs at each other.

We are here as a GROUP, a team if you will.

We all have a common interest dont forget, and that interest at the end of the day is skylines.

So just ease off on gettign stuck up in issues

[Sydneykid]

Bullshit.

Ouch I'm hurt. :goddam:

I'll bet most people know last year's Bathurst was won by Murphy and Kelly, but how many know who was the Team Manager?

[Sydneykid]

Wanneroo... i have only seen it on TV. It looks liek the straight is pretty quick but he rest of its is dancing on throttle stuff?!?!?!?

My new found concern after having driven around Phillip Island ( i suspect Sandown will be the same) is the time an engine spends well over 6,000rpm. Hit high 7gs change gear and the thing is still reving its little heart out at over 6,000rpm. Sydney tracks are nothing liek this, and much friendlier to engine, as i suspect Wanneroo is

Hi Roy, if I look at the data log from the RX7 (the one you saw at Philip Island) it shows Oran Park to be pretty tough on the engine. Philip Island has long periods at high rpm, but they are in high gears (4th and 5th). Oran Park has short runs in low gears, so the rpm climb rate is pretty viscious. With the Modena close ratio dogbox there is very little difference (between the two circuits) in time spent per lap at 7,500 rpm to 9,500 rpm. I would be inclined to the view that rapid deceleration and acceleration in low gears is harder on some engine components than the more gentler rpm climb you get in high gears.

One thing is for sure, OP is far harder on the gearbox and diff than PI. Maybe it all cancels out and all circuits can be tough in their own way. Now that bump at the end of the straight at Sandown.......1 diff, 2 tailshafts, 2 gearshifters :headbang:

[Sydneykid]

Volunteer Pit boys shouldnt take credit for those above them.

Everyone in my team gets credit, that's why it's a TEAM. I have a picture somewhere of Sam Michael sweeping the pit bay at Bathurst, you gotta start somewhere.

[Roy]

Everyone in my team gets credit, that's why it's a TEAM.  I have a picture somewhere of Sam Michael sweeping the pit bay at Bathurst, you gotta start somewhere.

Meh, what does Sam Michael know, didnt he go to University of Technology, Sydney or something? Cant be too smart if he couldnt get a high enough TER to study at UNSW

[Sydneykid]

Meh, what does Sam Michael know, didnt he go to University of Technology, Sydney or something? Cant be too smart if he couldnt get a high enough TER to study at UNSW

A UTS boy like me, I went there 'cause the course was better. :thankyou:

[Roy]

A UTS boy like me, I went there 'cause the course was better.  :thankyou:

Fat lot of good going to UTS did me, im stuck in Melb working for a pharmaceutical company, where at the moment damn possums are coming in at night and saboatging plant/equipment...where is Bill Murray when you need him?

UTS didnt do too well in the SAE comp, i had to pull out after a few months as work sent me OS ...i doubt my involvement would have made much of a difference though.

[N I B]

Hi Steve, on this dyno graph the AT is 21 degrees and the IT is 52 degrees.

On BMan's, the AT is 25 degrees and the IT is 31 degrees.

Help me out here, I am confused  :confused:  

PS; There are a couple of other interesting differences, but more on that later.  I am more concerned with the temperature differences first off.

No comments from you when your mates GTR did these kind of Air intake temps.

[Sydneykid]

No comments from you when your mates GTR did these kind of Air intake temps.

OK I give up, I have looked at every non WA dyno graph in this thread and can't find a question to ask. BMan's AT 25 degrees and IT 31 degrees, that's about what I would expect to see. Even Needs Speed has similar temps (AT 24 & IT 31), I don't understand why it's not the same as the other WA dyno graphs? Did you run it with the bonnet up? :confused:

[BU5TER]

I'll bite, here's 2 dyno sheets both shoot out mode only difference is one was done in during a damn hot day and the other on a coolish spring night

same boost

same factory ecu

same car

different work shops and at CRD, JEM etc i've always made between 325-331rwkw

[Roy]

So it made more power in the heat:confused:

[BU5TER]

Troy I think and could be 100% wrong that its has something to do with that Shoot Out 03 mode and the compensation made for the heat??

[Roy]

Troy I think and could be 100% wrong that its has something to do with that Shoot Out 03 mode and the compensation made for the heat??

Yeh, so it would seem. Ill have to remember to take a warm glasses of water to put the probe in when i dyno my car