RB20 GTR injectors/tune results

[Chris32]

Got my car uned last night, recently installed GTR injectors, Z32 AFM and Power FC in my R32, and yesterday it all got tuned -

For those who don't know all the other stuff, it has a HKS 25~ series turbo, no one 100% sure but either 2530/35/40, FMIC, Bosch pump, previous tune was quite lean and prone to detonation, so I used to keep the boost wound back a bit, previously it used to make dead on 200rwkw at 0.9bar

Also I got them to out in a ATS 1.5way LSD I had recently got (cheers FAT32 ) and fabricate a metal turbo to AFM pipe as well

Interesting results last night, all the tuning etc was done by Shaun at Boostworx

This is a copy of a email to a few mate, I couldn't be buggerd typing it all twice, so sorry if it doesn't make much sense! -

I got there after work and Shaun had just started running it up. I had a look at everything, the inlet pipe is good and does the job well, and the new diff was in and working no probs. Initial runs where showing around 165rwkw at 14psi boost, so we where a bit perplexed to what was going on. We began checking everything, and Shaun discovered that the shootout mode temp correction probe, which should be near the air filter, was in fact right in front of the cooling fan, which was effecting the reading, and I found a few vacuum lines that hadn't been put back right. Next run showed 187rwkw at 14psi, which was looking much better.

We wound the boost up to 18spi, but we ran into more problems, as it would get to 18psi really fast and then drop back to around 13psi, making no more power. I had a look around and spotted a intercooler hose connection that looked a tad dodgy, and upon inspection the hose clamp was only on about half of the pipe, so we had a big boost leak, so we put a new clamp on and it all was fixed

Next run it peaked at around 210ish back Shaun had to back off as it was showing a bit of detonation, this was at 21psi and around 6000rpm!

We dropped the boost back and Shaun made it a tad richer, and it made about 208rwkw but boost was dropping of from 17 to 13/14 psi after around 6500rpm, with the power curve nosing over quite a bit. the most knock it gets is around 25, so its pretty safe

We decided to leave it at that, as it was a nice safe tune and we took a degree of timing out at peak torque, so eventually the final figure was 205rwkw, but this is made at around 6400-500 rpm, so still have another 1000rpm with decent boost left once I get the boost controller sorted out .Its getting full boost by about 3500rpm now, so it like a real slingshot when you put your foot down, bugger all lag and just keeps pulling. Once the boost controller is sorted, and holding 17-18psi up top, it should make 220odd I hope. 2nd gear from 60-100 is very fast now, before it felt very laggy, now its very responsive

We are also going to replace the dump/front pipe section with something a little better as well, and maybe try some cam gears later on too

Shaun said his dyno is down around 10-15rwkw compared to his old one as well, so if i was to run it with the old state of tune he reckons it would have made around 185-190, so its making a fair amount more power now

Pretty happy with it, it drives very well and the new diff doesn't open wheel at all! The diff is a bit clunky around town, but its ok and doesn;t open wheel one tiny bit. It feels a little under-steery though corners, I put this down to the diff wanting to go striaght ahead as it locks up pretty quick

Happy with the results, as its not running on the ragged edge now, and only a few things left to be optimised now

Big thanks to Shaun at Boostworx, as we where there until 8.00 last night. I am sure the neighbours hate the sound of my car by now!

Chris

[Bl4cK32]

well done mate. Mine will be going in for its first tune on boost shortly

Gotta put the oil in my new 2 way, install my AVCR, then down to Shaun at Boostworx

Id like to compare both when they are finished....

[Chris32]

Yeah, I am pretty happy with it, and will be stoked when I can use the last 1500odd rpm with decent boost, it should make really good power then

It feels like a differant car, so much more responsive and its even got a bit or torque now

Still getting used to the diff, those mechanical jobs are pretty noisy, but they don't open wheel at all. Will be interesting to see how your 2 way is

Would be good to overlay the runs and see what a extra 1/3rd of motor really does!

[Bl4cK32]

Going by Joels response to his new baby.....its a big shock....

Cant wait to see what it does with the diff....and the rb20 highflow...LOL!

Glad your happy though

[WHITE R32]

yeah the gtr injectors are good i have them in my rb20 r32 gtst with a microtech lt12 plug in and a malipassi regulator and all factory internals.... 232 rwkw on 18 psi at the last sau dyno day up here and i think the injectors are at about 67% duty

[Chris32]

Yeah, the injectors are well suited to a bolt on RB20, they are a good match and can be had quite cheaply as well

Fitting a PowerFC boost control kit yesterday, so its holding boost alot better than the bleed valve, will have to get it back on the dyno soon to make sure everything is 100% and see what it ends up with (cheers Targa Tom for the help on how to do this )

Initial testing with the new EBC shows that its holding boost up top and comes on a little earlier than the bleed valve, whilst setting it up I was able to run a consistant 1.4bar and it held it pretty well all the way to just over 7000rpm.

I can see traction being a issue soon, as soon as it hits full boost, even with the new LSD and really good tyres, it roasts them quite easily

So muc fun to drive now, its 200% better than it was with 200rwkw and the old setup

[TokyoTaxi]

Way to go Chris32 !!

God I miss that diff but.......the effect is what I wanted. I drive a lot slower now cause I got NOOO traction.

[Chris32]

Cheers mate, that diff is a ripper! Quite amazing how it has improved the rear end.

It feels a tad understeery as it locks up at low speeds, but nothing a bit more steering cant fix, just starting to throw it around a bit now and it feels really good at decent pace

Its not as clunky as I would have thought either, its quite easy to drive around the 'clunky' spot by just clutching it around tight corners etc, its quite decent as a daily driver still. I have a track day coming up on the 3rd of december, cant wait to try it

Thanks for your help with the diff mate, really appriceate it

Chris

[Robo's]

What kind of actuator are you using? Maybe that is your problem for your boost to drop off up high.

[Chris32]

What kind of actuator are you using?  Maybe that is your problem for your boost to drop off up high.

Its a HKS acuator, sits at 0.9bar with the boost controller off

I think my exhaust can do with some improvement, the front pipe from the dump pipe to cat is between 2.5 and 3", not a full 3". Might go 3.5" dump and front pipe?

[TokyoTaxi]

Cheers mate, that diff is a ripper! Quite amazing how it has improved the rear end.

It feels a tad understeery as it locks up at low speeds, but nothing a bit more steering cant fix, just starting to throw it around a bit now and it feels really good at decent pace

Its not as clunky as I would have thought either, its quite easy to drive around the 'clunky' spot by just clutching it around tight corners etc, its quite decent as a daily driver still. I have a track day coming up on the 3rd of december, cant wait to try it

Thanks for your help with the diff mate, really appriceate it

Chris

Sweet as. Enjoy !!

Fine print: I hereby accept no responsibility for the wear rate of your tires from this day forward ( especially the rears ) :elaugh:

[Bl4cK32]

Yer the 2 way i got in mine is fikin unbilivable

Heaps better on the rear end...power out the corners now And the rear is sooo predictable

It is clunky at low speeds, but i can live with that Ive got traction issues now cant wait to see how mine goes in a weeks time (first tune with boost on AVCR)

Hopefully i can get mine out for the track day too

Any more mods left on the list Chris?

[Chris32]

Yer the 2 way i got in mine is fikin unbilivable

 

Heaps better on the rear end...power out the corners now And the rear is sooo predictable

 

It is clunky at low speeds, but i can live with that Ive got traction issues now cant wait to see how mine goes in a weeks time (first tune with boost on AVCR)

 

Hopefully i can get mine out for the track day too

 

Any more mods left on the list Chris?

Yeah, a decent diff, especially in a 32, is a huge advantage I reckon!

Mods wise I will probably just optimise whats on there, maybe revise the exhaust a bit, decent cold air partition, some R33 brakes up front

I have the GTR cams as well, but I reckon once its all sorted out for the time being I will wait until next year and some cooler weather before I do anything else

As for the track day, its a presicion driving course orgainzed by Manta Racing, better get in quick if you want to get on board, as there is a maximum of 20 spots for the day. If not, just wait until there is a general practice meet and give it a go, as the course is pretty pricey

Chris

[Chris32]

Here is the dyno sheet, the light line is the previous tune, I had to overlay a old sheet and trace it on

much more useable power than before

Chris

[yogi000]

excellent result chris.......you've gone from 130-140rwkw @ 120kph to 175rwkw and getting peak power alittle earlier.

nice work, also hows your idle with the bigger injectors and pfc? made any diff there?

Cheers

[Chris32]

excellent result chris.......you've gone from 130-140rwkw @ 120kph to 175rwkw and getting peak power alittle earlier.

nice work, also hows your idle with the bigger injectors and pfc? made any diff there?

Cheers

yeah, you can feel the greater spread of power, and I should be able to get the power to keep going with a few more mods, still have a exhaust manifold and bigger dump and perhaps cams to do as well

Idle, funnily enough is better than previous and fuel econmy seems to be similar, around 10L per 100kms. Its pops a little at idle, but I am pretty sure thats becasue my spark plugs are running a 0.8mm gap, as with the previous tune it did this also after I changed plugs

[Bl4cK32]

looks better now mate

[yogi000]

i'll post my dyno sheet once i get mine tuned....very similar mods

[Chris32]

Ok cool, mines getting a few things touched up on monday, I will post results

Chris

[whatsisname]

Top result Chris. Congrats mate.

Mine is down at BW at the moment. Having HKS cams fitted and then a retune. Should have it back early next week hopefully.