What Would You Gtr Owners Do: Trust T517z Or Garrett 2860r?

[dontfeelcold]

Do you know what the inlet temps were like?

[STATUS]

Dyno graphs will prove your claims, so get them up, surely you must have at least one graph after all the GTR's you've done??

i tune for a hobby, usually for free to mates and people who have 'interesting' setups that intrigue me, the dyno's graphs go with the owners not with me, as i posted earlier i will post up graphs once the new tailshaft is sorted.

[STATUS]

In what way are they 'far' better??

I have results showing otherwise, with a big difference in midrange... bush bearing turbos versus twin ballbearing turbos....

For example, at 128km/h in fourth gear, my car was making around 160rwkws with the T517Z's(8cm), and with the 2860r-5 is now making 240rwkws....

I know which setup I'd prefer....

Care to show us your comparison????

Go to post #29 in this thread for mine....

graph up 2moro, finally got some roller time (car is still playing up so it is only a 14.4psi run and making only 286rwkw-odd at the rears)

but at 120kmh it is making nearly 80-100 rwkw more than yours did from memory....

[JAGR33]

but at 120kmh it is making nearly 80-100 rwkw more than yours did from memory....

LOL, maybe its all those years of experience you have in tuning and building rb26's...for free....

[STATUS]

LOL, maybe its all those years of experience you have in tuning and building rb26's...for free....

HAHA you a bit cut? i dont claim to be an expert but your car just seems "flat" by your descriptions especially compared to our results, i cant be held for your cars shortcomings.

Edited April 23, 2007 by URAS

[JAGR33]

HAHA you a bit cut? i dont claim to be an expert but your car just seems "flat" by your descriptions especially compared to our results, i cant be held for your cars shortcomings.

Hardly....

I don't get cut from people who make claims without backing them up, it just proves my assumptions of them...

You claim that the T517's are much better than the 2860R's that you have tuned in the past, I asked to see a comparison, assuming that you actually have tested both... still waiting....

I'm discussing my comparison with facts, your just talking out of 'insert YOUR username here'.....

Prove me wrong so the discussion can continue with merrit....

Will have to go back to Ben from Racepace and tell him he's not doing a good job on my car..

That is all....

[gun32gtr]

HAHA you a bit cut? i dont claim to be an expert but your car just seems "flat" by your descriptions especially compared to our results, i cant be held for your cars shortcomings.

yeh get some results up,interested to see if i wasted money on 2860r...lol

[BOOSTD]

wasted money hmmn, if we compared prices ........................

[gun32gtr]

i paid 2 much.could have got them cheaper...but i reckon from your results im gunna be more than happy with the 2860r even tho i paid more than most

[STATUS]

dyno sheet at 14.2psi and still with issues

hmmm i seem to see 210rwkw at 120kmh...... with -6 degrees timing over the whole map. No doubt there is another 10-15rwkw hidden in there once ive found the breaking down issue.

Edited April 25, 2007 by URAS

[paulr33]

jack makes 240rwkw at 128km/h or 4570rpm

yours makes 230rwkw at 128km/h

sort out the misfire then we'll see how it looks

also this is in a rwd chassis? so take out some 4wd drive loss on jacks setup

[BOOSTD]

dyno sheet at 14.2psi and still with issues

hmmm i seem to see 210rwkw at 120kmh...... with -6 degrees timing over the whole map. No doubt there is another 10-15rwkw hidden in there once ive found the breaking down issue.

looks very similar to the standard turbo response.

[GTR1993]

that curve is almost identical to my gtr with tomei 260s and unknown steel wheeled turbos. Its with in 10 kw everywhere.

[STATUS]

looks very similar to the standard turbo response.

exactly.... wind in more boost and they will happily support 380rwkw..... which is my whole point (excellent response yet able to support good top end).

The same tune as above with std dumps, -6 degrees and fat mixtures 10.8:1 A/F pulled 328rwkw at 17psi.... (i would expect another 20rwkw easily with 12.0:1 and more timing). i would post the graph but i could not get a clean run without the missfire gremlin, next week i will run it up again.

[Roy]

But road speed can be misleading. What is the final drive of each respective car and the gearboxes they are running, also tyre size. You could be looking at large rpm differences .

LOL. Im amazed you folk let me get away with my silly RB20 remark. The gearing in my car means im pulling much higher rpm for a given road speed then you guys...hence why i have similar power at the road speed in the earlier example

[STATUS]

But road speed can be misleading. What is the final drive of each respective car and the gearboxes they are running, also tyre size. You could be looking at large rpm differences .

LOL. Im amazed you folk let me get away with my silly RB20 remark. The gearing in my car means im pulling much higher rpm for a given road speed then you guys...hence why i have similar power at the road speed in the earlier example

GTR diff and R34 box (box ratios are the same), diff ratios are actually a little differrent as we run 3.9 instead instead of 4.11 which is std GTR ratio (which would actually disadvantage us comparison wise), it use to run 4.373 but it was too short with the GTT box. tyre size is 235/45/17

Edited April 26, 2007 by URAS

[str00th]

Well i read every single post so far.

From what you guys have said and dyno sheets etc etc i am going with!

Garrett 2860R-5's

Stainless Steel Manifolds

Stainless Steel Dumps

With my supporting mods of

tomei 260 9.15 cams

700cc sard injectors

3.5" exhaust + highflow cat

K N filters

Hybrid intercooler

Blitz SBC - i color

Sard Fuel Reg

Boch 044

R32 ECU retuned

I should easily pull 300KW+ at 16psi give or take

The main difference between the HKS and garrett turbos is the wheel design. They are compressor and turbine may be the same sizes etc but the HKS wheels are upgraded to induce more air etc

[BOOSTD]

I think the point to take away is that the std manifolds are crap for anything over 350rwkw and definately do not improve response over the chinese ebay stainless mainfolds

517Z's, 2860R, HKSGT2530@24psi and my 2860R on std manifolds@26psi

At 95km/h, 85kw 95kw 90kw 85kw

At 112km/h, 105kw 140kw 130kw 130kw

At 128km/h, 155kw 240kw 200kw 200kw

At 145km/h, 255kw 305kw 296kw 317kw

At 160km/h, 330kw 325kw 315kw 350kw

At 178km/h, 360kw 350kw 355kw 361kw

At 194km/h, 365kw 358kw 372kw Chart stops

I do have a chart that keeps going and power drops off after 178km/h as does boost also....down from 26psi to 24psi at 200km/h The drop in boost starts at 169km/h at the 350kw mark. The 2530's with the stainless manifolds did not drop boost at all.

Full Boost is also made at identical points compared to the 2530's (134km/h)

As a real life comparison.

In 4th

2000rpm starts to make +ve boost

3500rpm .5bar

4050rpm 1bar

Does anyone have a comparison for 2530's ?