HKS3037S 56T Retune

[sidewaymambo]

nice work steve..

[Guest MFX_R33]

Originally posted by rob77

1/4 mile times would have to be compared on a same track and day basis and probably running together at the same time. Different tracks different prep work and also different ambient temp's as well, just like dynos.

E.T's would not be a great comparison, but the MPH would be able to give much better comparison.

Jeff.

[EVOIV]

Steve: I have had a look at your dyno graph but I can't really tell when things go wild? Can you explain? I guess my chart is a lot smoother and progressive with it's power, but of course doesn't make as much power as yours My chart also seems to produce power a lot sooner than your chart, but then I can't remember what gear my car was run in. Yours was done in 4th right? I would have assumed the same? Or maybe mine was done in 3rd? Anyone know what's the norm when tuning cars? My car was tuned by Shaun (who used to work at MORPOWA, then RPM...now???). Done at Turbo Tune's dyno.

[i've attached my dyno chart on another thread somewhere, called "Apart from Tilbrook..." or something like that]

[Steve]

Thanks sidewaymambo.

EVOIV, the scale at the bottom of the dyno was not calibrated properly. Basically boost starts about 2200 to 2300 or there abouts, then at about 2800-3000 it goes crazy. If you look at the torque curve, it goes almost vertical - thats the boost hitting, you can also see it on the power curve, after full boost is made (where the torque curve flat lines) the power curve stops climbing as aggressively. Hope that explains. My run was done in 4th, sometimes runs are done in 3rd, but because there is a gearing advantage (ie not 1:1) the torque and therefore power would be higher than if run in 4th. At the end of the day I dont think it makes a huge difference which gear, the main difference is how and where the power is made. No good just making decent power in the last 1500 or 2000 rpm, unless you are on a drag stip and have set up your gearing to be able to keep within that range - if you know what I mean?

I might have to go and find your dyno results:D

[Steve]

Looks like it is in 3rd gear. What sort of boost is that at? Doesnt seem to spool up like mine:)

Torque seems to be really dropping at the top, but otherwise that seems like nice progressive power dilivery.

How did it drive? Wouldnt you be better off with a smaller turbine housing? would probably bring boost on a bit quicker.

[EVOIV]

Comparing your dyno graph to mine, it does look quite similar until your car reaches full boost. On mine, at 60km/hr the car produces 60rwkw, then at 100km/hr it's at 206rwkw. So there is a steep curve, just like on your graph at a similar range. Only difference is that your graph keeps going up from then on whereas mine doesn't. It would have been good if they took a torque curve on my dyno chart too. So they're probably equally as aggressive as one another, only thing is that mine is AWD so I rarely had traction problems. One thing I did notice was that the car seemed to lack low down torque with the larger turbo, yours might be different.

[Steve]

Torque is actually improved on mine down low, feels much better to drive than with the stock turbo.

[Steve]

Thats why I think yours is done in 3rd, it doesnt go high enough:D

[EVOIV]

Yeah that could be true, probably reaching the rev limit there. There's no torque curve on my graph, just power and AFR (which I think was a little lean). When it was on it felt pretty sluggish off boost, but was really good once boost kicked in. Never lost traction through the gears though, I am not sure if this was due to the AWD or loss of torque? It was run at 19psi. I think you will need to increase your boost to see how it responds. Then you can tell whether or not you want a larger exhaust housing or not.

[RS500]

EVOIV/Steve,

if i buy this turbo with a 1.01 housing, r u guys up for an exhaust housing swap?

[Guest INASNT]

steve

i can get u a .87 housing for your 3037 from the same guy that is building my turbo if u like. But u gotta come down to melbourne to chuck it out and try it out

[EVOIV]

It's up to Steve, but also depends on me when/if I can get my turbo repaired. If not, why not keep the 1.01A/R RS500? Probably too laggy? But it's gonna hit like hell

[Steve]

RS500, 1.01 is a bit big for my liking sorry but that is probably perfect for a 3 litre. I only have a 0.61, werent you after 0.73?

EVOIV, I am pretty sure the turbo has no dramas to 1.2 bar, cos I already gave it a test run. I am thinking that even though it may make power at higher boost, the back pressure could be choking the engine and I would make more power at the same boost with a bigger housing. Just not too sure how much lag I want to trade off. BOOSTD said there wasnt much difference between 0.6 and 0.8 on his turbo, so I am even keener to try a larger housing, even if it still pulls hard with more boost.

INASNT, I am interested, but with the cost of fuel and accomodation, it would probably be alot cheaper to do it here in SA:D Would be a nice drive though.

[EVOIV]

Steve: What's happening to Trent's 180? As I last heard from Chris (who now works at JMS) that they are going to put on a GT2835 as they found the GT3037S too laggy for their purpose, which I think is street and drift. They used a 0.87A/R on theirs I believe? If you're planning on running high boost (1.5bar), it may be wiser to go with a slightly larger exhaust housing so it's more free flowing at higher boost. I think you should be fine with a 0.73 or 0.87. For boost around 2bar, it'll probably be worth the 1.01A/R.

[Steve]

The 3037 on Trent's car has a 0.73 on it, I have seen his 2835, but I am not sure what size the housing is. He is having a bit of work done in other areas until he puts the turbo on. Dont want to say too much on a public forum, cos its not really my place to be telling if you know what I mean;)

I am really keen to get hold of a 0.73, but ideally would like to be able to try a 0.87 too, just for comparison sake. It is one of those things, if I dont know for sure, I will always wonder and that will drive me nuts:D

So if anybody has a 0.87 or 0.73 they would like to swap for a 0.61:D

[rob77]

I think the basic moral of the story is anyone thats looking for a turbo upgrade, but still wants full boost quick like the stock turbo the hks gt3037 is the way to go Unlike my lag monster td06-20g with 16cm exhaust housing I cant wait to drop in the ecu and see if we can get the turbo spooling quicker.

[sidewaymambo]

rob77

trust me..the TD06-20 won't lag them what you think.....we know all car are different, but may give you a good idea..

[EVOIV]

rob77: I wouldn't expect the 20G to be much laggier than a GT3037S if at all. The 25G may be laggier, but the 20G is a smaller turbo. Plus, you seem to be getting great results out of the TRUST turbo. Go the T88, now that's a lag monster

[Guest INASNT]

The 3037 is rated at higher hp than the 20g isent it??

also the trust is not a ball bearing water cooled turbo like the hks, hence the slower laggyer delivery

[Cubes]

Originally posted by Steve

Torque is actually improved on mine down low, feels much better to drive than with the stock turbo.

Funny you should say that steve as when I fitted the VG30 BB ceramic turbo to my RB20DET I noticed obviously lots of lag where it made full boost around 4000rpm but it also did improve off boost torque quite dramatically.