I am asking this for a friend, he has a 91 eagle awd. the engine is rebuilt with wiseco 9.0 and eagle rods fully balanced. it has stock head with brian crower 280's springs and retainers and all the nessesary supporting mods. he wants at least min. 600whp and he wants to know what a/r will be more street friendly .63 or .82

he will be using AEM and race gas

.63 will spool faster, .83 will provide more top end power.

For 600+ he's going to want the .83

I would say .83 as well, but it would really depend on his purpose for the car. If all he wants is power for the sake of having power, then .83. But if he wants a useful quick(er) spool then as project_tsi said get a .63.

i'm new to turbo's but this thread caught my eye.

.63 a/r is quicker spooling than the .83 for obvious reasoning. where can i find a map of the turbo(not sure exactly what to call it) i'm looking for a new turbo for my 2.3l setup and not sure what to go with like to hit high HP numbers but want the turbo to spool quickly, and also be able to mount to t4 shearer top mount manifold.

Is the .63 a/r gt35r able to bolt up to the t4 manifold? if not what other options do i have to hit min. 500whp using a t4 manifold, still allowing me to spool near/around 3500rpm, if possible.

Too Bad there is no .83 just screwing you guys around.

In your question you ask whats the most streetable housing of the 2 but then you say he will be running race gas all the time.

Is this guy like Mega Loaded or something?

If he is going to street drive the car on a 2L motor than a .63 is what he wants. If its going to be a Drag Only car, then go with an .82 for the increased top end flow.

sorry not to specify, I meant race gas for the 600whp setup, the car will only see race gas on the race track but as i stated before we also want a street friendly housing, probably with 93 oct. we well be around mid 450whp. Ok maybe .82 is the one togo but wont be too laggy for the car on the street?

I have an .82 trim T3 35R and its fine on the street, it dose take a little while to spool but its not too bad at all.

Many evo's have made 600+awhp with ams's 35r kit and they use the .63 a/r turbine on all there 35r turbo kits.

Yha, T4 35R...

if you have a topmount t4 manifold just get a .58 t4 gt35r which is just imbetween the .63 and the .82

definitiveno said:

if you have a topmount t4 manifold just get a .58 t4 gt35r which is just imbetween the .63 and the .82

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Thanks

You could also get the divided T3 .78 housing and an SLS bottom mount divided T3 manifold.

Steve93Talon said:

You could also get the divided T3 .78 housing and an SLS bottom mount divided T3 manifold.

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Trust me when I say no he couldn't. Paid sls in october for one, never recieved it. Only last week I settled on their traditional undivided mani was I able to get a product.

how is that spool on that t4 .58 a/r?

.82 will be fine. You'll love it. I wouldnt waste a 35r with a .63 ar.

BrokenTsi said:

.82 will be fine. You'll love it. I wouldnt waste a 35r with a .63 ar.

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at waste

I would say .82 for that magic 600awhp. My friend made over 575awhp and only missed that number because he ran out of pump. The 950's were fine, but injecter duty cycle was climbing to compensate for the pump. As soon as he sumps his tank he will be back on the dyno, and hopfully some low 10 second slips. He however did it with the .63 housing. We started to see the choke point around 28 psi, becasue he wasn't making the same horse power per pound increase in boost. We stoped at 32 psi, and think we could have made it at 36 psi or so on c16.

If looking for 600+WHP, definitely look to the .82A/R housing.
I have the .63A/R GT3582R and it's definitely not tough on the street to drive w.r.t. spool/response. I can't imagine the .82A/R being much worse (e.g. shoulda got an .82 )

fst91dsm said:

I have an .82 trim T3 35R and its fine on the street, it dose take a little while to spool but its not too bad at all.

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Just curious where you 35R guys are starting to see positive boost pressure? I'm in the market for one of these and am debating on A/R size also. My redline would be 7.5K. Any recommendations?

GloriousDSM said:

Just curious where you 35R guys are starting to see positive boost pressure? I'm in the market for one of these and am debating on A/R size also. My redline would be 7.5K. Any recommendations?

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positive pressure like 1 pound or positive pressure like 20 pounds? I think I remember guys saying that it makes like 1- 2 pounds of pressure at almost any rpm under a full load but doesn't really, truly, reach full boost until 5k rpm or better........


Here's some graphs that were made on evolutionm comparing logs.




and a link to the thread

http://forums.evolutionm.net/showthread.php?t=148783&highlight=gt35r+lag


Basically there is more information than you could ever want to know regarding spool up characteristics on 4g63 motors.

Here's a 2nd and 3rd gear pull from tonight (mods in profile).
Note my .8bar WG spring was not holding more than 20.5psi so feel I could improve a bit more

I have a smaller turbo but with more lag, damn those big exhaust housing. Oh well, thats whats nitrouis is for.

Thank You, real useful info

I have a GT35 with the .63 housing on a 2.0 motor. I get 5 psi on the freeway, that's at about 3300rpm, which is plenty of power to pass.


If your redline is still 7500rpm then you better have a stroker motor or else you won't be able to take advantage of the power that the GT35 can make.