Input on proper turbos for my build

[skywhine]

Hey NICO members,

Im looking for input on which turbo's to buy for my specific build. Im getting mixed reviews depending on who i talk to at Z1. I understand not all of you do business with z1 and thats ok. So far im very pleased with them so i will continue doing business with them.

Ok on to the specifics of my build.

Im building a drift car that i can compete with in the amerature local drift series, with the intent to compete in the pro-am series once the car has sufficient modification/saftey eqipment. The local track is Evergreen Speedway in washington state, generally round 5 of the Formula Drift season. The track is bassed off of a 5/8ths mile oval track. The course starts on turns 1-2 and going backwards transitions into the infield. Average entry speed into the course is 80-90mph +/- 10mph depending on car or initiation style. The average amerature car has 400-500whp and the pros anywhere from 500-1000.

That being said my goal is 500whp or so. The car will not be daily driven, if even road legal. I have a DD, so i am building a "racecar".

Current modifications engine wise include:
Wiseco 88mm
Eagle rods
ARP hardware
Nismo 740s
3" turbo back
JWT ecu
FMIC- i understand its terrible compared to ashspec and others

I plan to use stock manifolds/cams/fmic for now until i run the pro am series, then i will rebiuld to a proper racecar with msp's, jwt 500 solid lifter cams, lifters, 2.5" IC piping and ashspecs. But for now i still need $5000 worth of saftey eqipment before i can even try and compete.

My question:
For this build, bassed on data and or experiance, which set of turbos would best suit such a build?

-GT2560RS
-GT2854RS
-GT2860RS

From what ive collected on my own, mostly from specialty z's blog, the 2860 will get me what i want, but talking to z1 they are saying the 2854 for better response. Will the 2854 still get me where i want?

It seems i will most likely need to run race fuel for this setup.

Thank you.

[skywhine]

Spent alot of hours over at TT.net the past few days. From what ive gathered between the 2560r and the 2860r, the t25 spools much faster, but has the potentail to choke up higher rpm. The t28 spools around 4500 but flows much better higher rpm. Im under the assumption that they share the same size compressor housing. Also according to Ash the t28 is on the larger side for our engine. Still very useable, but mildly built engines arent efficent enough to use the full potentail of the t28.

Which appears to be better for drifting. I believe the responive turbos would be better. But i dont really want to have to build the heads to create 500whp.

[NolimitZ32]

I don't have too much experience drifting professionally, more of the throwing the tail around corners and on overpasses but I would imagine that for drifting you want the smaller turbo. I have damn near the same setup you are planning to run and the spool on my HKS 2530s (GT2860RS) is nothing to scoff at.

[300ZXttZMAN]

https://specialtyz.com/shop/300zx/turbo ... -530s.html

Since fast spool is what you are looking for. I think these turbos are a perfect choice for your plans.

[skywhine]

I don't have too much experience drifting professionally, more of the throwing the tail around corners and on overpasses but I would imagine that for drifting you want the smaller turbo. I have damn near the same setup you are planning to run and the spool on my HKS 2530s (GT2860RS) is nothing to scoff at.

Would you care to elaborate?

I dont quite understand what you mean by that last sentence. My last drift car was a mostly stock rb20 which was basically a 4age until 4500 or so then it took off like a rocket to 7200 and i absolutley loved it. Then i bought the z and discovered torque. I still like the top end power for drifting.

Right now im torn between the 2560 and the 2860. I want the 2860 for the obvious reasons, but i may be being stupid as the 2560 might be better for what im doing with the car. I did find a thread somwhere where 675ish whp was obtained from the 2560 with a "fully built" engine on race fuel.

As far as drifting goes, from what ive gathered over the years, most of the time the rpms are near limiter, and if for some reason they drop below half, a simple clutch kick solves the issue. So a street turbo isnt a nececity, hence why im torn between the 25 or 28. The 25 will spool faster but be restrictive top end, 28 opposite. If i could have decent power at 4000 rpm id be happy. One day i plan jwt 500 series with solid lifters and increase rev limit to 8000 or 8500. Had the rotating assembly balanced when at the machine shop. I told him id like it good to 9000 rpms, whatever that means lol.

$3000 is alot to spend, so i want to be sure i know which turbos i want.

Thanks.

[BlackWidowZ]

do you have NA diff. I know this is a stupid question cuz you said you are drifting ur Z.

[skywhine]

No, tt rear sub frame still. But ive considered swapping an na subframe for the r200. And to get rid of the steering rack of course. For now im just using the tomei rack lock kit.

[BlackWidowZ]

cool reason why I asked is cuz you would have more torque at lower rpms with the na diff. you would have more power at 4k rpms for sure. ur turbos would also spool faster due to lower gearing.

[skywhine]

are you suggesying 2860's and an na diff?

[BlackWidowZ]

ya

[skywhine]

[BlackWidowZ]

ya cuz nolimitz32 has a na diff with GT2860RS. I think he assumed you had the NA subframe since u are drifting and u had it too.

I remember him saying his needle goes 1k to 7.5k in milliseconds or something im assuming that is 1st and 2nd gear. .

[skywhine]

So was he saying the spool was "good" ? Stock they almost spool too fast, if i can say that lol. Or at least compared to what im used too. I dont mind a little lag by any means. I just dont want a set of 35r's..if you get my exaduration.

[BlackWidowZ]

idk he have to answer that question. i dont have that info.

[NolimitZ32]

That right there will make more of a difference than the difference between the 25 and 28. I have the NA rear end (my car was originally NA) with the 2860RS setup, built engine, 3" TBE, fuel upgrades etc. On the streets if I put the pedal down at any speed from dead stop to around 60 my rear tires pretend like they are on ice

I get full boost (wastegate boost @ 1bar) around 3400 - 3600 IIRC (its been 5 months since I've driven my car)
I'm running stock NA rear wheels with some AVS100s 225/45 IIRC
Stock NA rear end


I don't really know what else to elaborate on, 2860RS are great turbos, spool like a beast and make hellacious power. While drifting you are operating near the upper limit but when you lift you lose spool and need time to get it back up may it be a 1/10 of a second or w/e. I think your best option for performance is bigger turbo and antilag then you stay spooled even with the gas pedal released BUT antilag tends to ruin turbos so that's a choice you'll have to make on your own. Seeing as how replacing the turbos on a Z32 is a PITA I would in your position go for the 550BBs

[skywhine]

And to think i thought i was going to have to ask.

Thanks no limit.

I do like the thought of 2860's or z1's 675r kit.

No antilag or bee*R limiter- $3000, thats too risky. Im sponsored by my work lol. (Me)

I dont know if its a bad idea, but 500ish on pump is more temptng to me than racefuel...i guess bc it leaves more room for more power. Not that ill need it. 500 wheel is a S*** ton, scratch that, a metric s*** ton.

[NolimitZ32]

Realistically you don't need much I doubt that I'm at 500 whp right now I'm running wastegate boost on a OTS tune. probably around 450-480 and my Z LOVES to get sideways and its fairly controllable too.

[skywhine]

if i run the 2860's ill probably run around 18psi on pump fuel? Alot more on race fuel.

The z loves to get sideways even in stock form, but not past second gear, id ike to get sideways in fourth gear.

[NolimitZ32]

In that case gearing is your friend.

[Ace2cool]

R200 FTW in that case.

[skywhine]

ive got a hook for an na rear subframe. To my knowledge they bolt into a tt? Which driveline ks used?

[skywhine]

Nolimit- are you using stock manifolds or msp manifolds?n

[NolimitZ32]

Olschool RZT SS tubular manis

[skywhine]

Oooo. I can't seem to find anyone that makes a tubular manifold these days. I bet that helps with spool a bunch on the 2860s.

[NolimitZ32]

I have nothing to compare too except the stock T22s on stock manis, I originally got them because I didn't have the money for MSPs. I wanted to wait and get MSPs but I wanted the car running before I left for Australia so I used the RZTs, I was going to reinforce them and add some brackets and load transferring members but once again I didn't have time. If they ever crack I'll replace them but until then They shall stay, not like the car is going to see much driving over the next 4 years.

[Ace2cool]

ive got a hook for an na rear subframe. To my knowledge they bolt into a tt? Which driveline ks used?

It'd be one for an N/A -> TT conversion. Talk to Shaftmasters. They're a site sponsor and usually hook members up if you tell them we sent you. Great quality product. I've got one and love it.

[NolimitZ32]

Trans splines are the same for NA and TT, Diff on TT uses 8 bolts IIRC, NA diff uses 4 bolt. So you'll need a new DS if swapping to NA rear end.