SPITVENOM67

Ok I purchased this car as is and its a gsr built etc
I am making boost starting at 5 and full at like 6500
these are the specs on this turbo

compressor trim .70ar
compressor wheel diameter 70/94
turbine wheel diameter 64/73
exhaust trim .81 ar

how badly sized is this for a gsr engine 82mm

Schister66

Which exhaust manifold are you running?
Exhaust size?
IC piping size?
Intake manifold?
Compression ratio?
Name brand turbo or some eBay ****?


Do you have any datalogs/dynos? That'd be helpful...

SPITVENOM67

Schister66

The topmount is going to be laggier relative to a shorter-runner manifold and the IC piping is large and again, will be laggier than 2.5" piping. I dont know much about the turbo, but eBay (non-name brand) turbos tend to be less efficient and spool slower/make less power per psi than a comparable Garrett/PTE/Borg Warner. If you want better response/less lag, there are ways to accomplish that, but not without making changes to the setup

SPITVENOM67

I agree but still 6k+ full spool to get 18psi is bad the turbo and compressor wheels dont look right the sizes that 70/94 number doesnt seem right

dcmatt

iTrader: (7)

If the inducer of the compressor wheel really measures 70mm then thats the problem. A smaller turbo will give you a much better powerband.

boostjunkie757

im confused why you put a turbo that the exhaust housing is a .81 ar and the compressor side is a .70 ar on a honda...



to me, on a smaller displacement engine, that sounds backwards. you want the hybrid to be in the opposite direction since you have less exhaust gas to push the turbine in the housing..

SPITVENOM67

I didnt put this on lol the car came with it so I will be changing it.
that 70/94 wheel makes no sence to me with the 64/73.

Best reccomendation for turbo to get this car going? I was thinking 6262 .82ar

Schister66

What are your power goals? Is the 82mm GSR block sleeved? If not, that changes your goals/outlook quite a bit

The 6262 isn't going to be a very responsive turbocharger either...and if you're only looking to make 500whp, there are better, smaller options out there.

boostjunkie757

im not certain if its the best one for the goal in mind, but i know a t3/60-1 can make that type of power...im pretty sure mine could be there if i were that concerned about getting to that point..

Schister66

The 6262 is ~74lb/min which means it will make 700whp give or take. The 60-1 depends on which exhaust wheel you have, but no matter, it will still make 500whp...its a 61lb/min turbo and despite the age of its design, a much better fit for the setup. Personally, I would go with a Borg Warner S258 for that power range, but there is more than one solution to this problem

boostjunkie757

ill bet the 6262 registers insanely on the butt dyno when it comes to responsiveness...lol..



may take a brief moment for it to fully kick in, but once you get it spooled up the first time (provided you have slicks..) you dont have to worry about it having to spool up again.

Schister66

That is the big selling point for the 6262 and similar PTE turbos...they're a bit sluggish, but there is enough rotating inertia to keep them spooled once up to speed. That's why you see so many of them used in drag applications

SPITVENOM67

Block is sleeved GE sleeves, cp pistons, eagle rods arp hardware ect etc ive got 1250cc injectors running e85, head has valvetrain also. I am going for 600whp, every chart ive seen with a 84mm engine on the 6262 has started spooling at 4k and 15psi by 5k already. Only thing I have is b16 cams which ill change in favor or skunk pro 1s or type r cams.

dcmatt

iTrader: (7)

On a 6262 go with pro 1s or gsc t1s. The gsc t1s have worked out great on gringotegs setup and turbo ls's 9 sec 62mm car.

DDTECH

Street car?.. primaries sizing plays a role in turbo spool, specially on a street vehicle..
Something alot of people overlook.

dcmatt

iTrader: (7)

^^^^ his cams are awesome too.

SPITVENOM67

Street/strip not my daily. You guys think the b16 cams are in now are a huge setback also for spool?

ls joker

major set back. b16 cams are ridiculous

wantboost

iTrader: (2)

Yea a 70mm compressor wheel is gonna be lag city on any small displacement motor and for the size (depending on fuel used) I would expect more than 500 but that's China/eBay.

you need to decide on a reasonable power goal for your fuel type, how you want the car to behave/respond and only then can you really size a turbo properly.

and yes at your current (and expected) power levels a good set of cams will help... more midrange and top end (generally) along with slightly better turbo response depending on cam profile.

B and B

iTrader: (3)

Can 1250's deliver 600 on E85?

wantboost

iTrader: (2)

eh, maybe.... with a high enough base pressure but you'd probably be at the very limit...

all setup/tuner dependant

scottdh20

yep...i dropped my primaries down to 1.25 from the "standard" 1.5" everyone seems to be using...i also rock a d-series though

at my power goals i simply did not need the flow from 1.5"...just helps keep velocity up in turn spooling the turbo quicker

people are generally very suprised in my hatch at how quickly it spools and puts you back in the seat...

to reduce spool time i used a hx35 with the twin scroll 12cm^2 housing mated to a forward facing manifold with 1.25 primaries (needs to get ceramic coated) heat wrapped everything, 3" exhaust, tons of headwork, just make everything flow smoothly, with the ff manifold it cut 2'+ of charge piping out which also helps a ton. i plan to back door the pasenger side soon that will cut another 1-2' of charge piping also

wantboost

iTrader: (2)

my manifold has 1.25" primaries as well, didn't see the point in 1.5" since I'm aiming for midrange torque and not trying to set a power record.

DDTECH

I Would strongly suggest a camshaft change, that is and sounds like the cheapest way to increase spool time - There are a lot of good, proven brands out there, alittle searching will point you in the right direction..

Changing manifolds and turbos seem to be a serious ordeal and I don't know if you're quite ready to take that route. Considering your running a camshaft that has primaries 3 times smaller then most camshafts now.. You're probably not getting enough flow/velocity to help the turbo in the lower rpms.. hence your lag.

Camshaft swap is in order and you should be fairly happy.