Is it how much PSI or how much HP stock block can take.. different size turbos.!

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06-30-2003, 03:10 AM

#21

turboboy

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Re:Is it how much PSI or how much HP stock block can take.. different size turbo

true, but to produce 7psi at redline, the turbo must work much harder than at lower rpms since the engine is taking in much more air

06-30-2003, 10:48 AM

#22

2000vsm

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Re:Is it how much PSI or how much HP stock block can take.. different size turbo

Quote:

Originally Posted by ghettoturbo

true, but to produce 7psi at redline, the turbo must work much harder than at lower rpms since the engine is taking in much more air

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ok.. you don't understand what i'm saying...

say your boost guage will tell you at 3000rpm, it's saying 7psi.. and you keep flooring it, it still says 7psi.. so whatever "work" the turbo does, does it before 3000rpm, after that it doesn't need to do more work as long as you want 7psi MAX... i'm not talking about you crazy people running 50psi on a stock block, just 7psi.

06-30-2003, 11:05 AM

#23

turboboy

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Re:Is it how much PSI or how much HP stock block can take.. different size turbo

ok, you dont understand what I'M saying....to produce 7 psi all the way from when you first get max boost to redline, the work the turbo does increases. As the engine spins faster, it needs more air, hence the turbo works harder to produce the same 7 psi. Case in point: my twin-turbo vr-4 that runs 9 psi stock. It will hold 9 psi to redline all day long, but turn the boost up to say 15 where i have it, and the turbos can only flow enough air to hold about 11 to redline. I can set the boost as high as i want, and i may see that boost down low in the rpm range, but at redline the turbos just cant keep up with the motor....get it?

06-30-2003, 03:11 PM

#24

2000vsm

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Re:Is it how much PSI or how much HP stock block can take.. different size turbo

so so if i got a t25, 5psi is cookies for that turbo, it will have NO PROBLEM for 5psi!

that's what you guys don't get it.. i'm not shooting for 10000hp at 750 psi... i just want 60whp at 7psi and that's it.. i'm not going for the competition crap.. i just want a more peppy car for fun. hell i won't even go to the track...

06-30-2003, 03:38 PM

#25

1.5 BAR

Join Date: Mar 2003

Posts: 811

Re:Is it how much PSI or how much HP stock block can take.. different size turbo

lol damn I did say i put another tdo4 on didnt I. Sorry I meant to say tdo5. Stupid typing. I think we are all saying basically the same thing here just in different ways.

07-02-2003, 09:23 PM

#26

BoostedED9

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Join Date: Dec 2002

Posts: 296

Re:Is it how much PSI or how much HP stock block can take.. different size turbo

Quote:

Originally Posted by ZexRex

the question about how much psi can my engine handle.. its not psi, its how much hp can it take. if you have it dyno tuned with good fuel management and a wideband a stock dseries can take 200-250 hp daily or 300 (jan style – reliable but wouldn’t be the best daily driver). its all about tuning.

you can relate hp to psi by figuring in what size turbo at what cfm.

example:
BoostedED9
d16a6 - t3t04e 50trim .60/.63 ar, stage 3 wheel
302hp 251tq @ 16.5 psi

now i cant find a dyno of a d16a6 with a smaller turbo like a tdo5h or rhb5 but at that psi they will make less horsepower. i would guess 240-250ish. they will also be less efficient at that psi. if you compared them both at 10psi you would see the difference.

also these turbos have different purposes.. i am talking about peak hp, ie drag racing. if you want a car for rally or road race you want to spool before 4500rpm. but for drag you will never be in that rpm range.

i ran d16z6 not a6

07-03-2003, 12:08 AM

#27

89dxhunchback

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Join Date: Jan 2003

Posts: 1,115

Re:Is it how much PSI or how much HP stock block can take.. different size turbo

get a garrett T3 and think of the exhuast A/R as the cam, and the compressor A/R as "how much boost you wanna run".

don't mind lag ? get a .60+ A/R exhuast housing
want no lag ? get a .40ish turbine housing

Want low boost ? .48-.55ish compressor housing
want insane boost ? .55ish+ or .55++ or .55+++

I'm hoping for 250whp @ 17ish PSI ( with water/alcoy injection )on a D16Z6 with an D16A6 head, 8.4/1 compressoin ratio, and a garrett T3 .48/.63 turbo ported.

little more lag ( for hooking up ), decent compressor ( prob. a little too small ) and low compression = good mid-high rpm power.

WRX turbo @ 8 psi would rock as a daily beater. ( first I'm going to use the WRX turbo to make sure the car is going to hold-up to any kinda boost, then I'm swapping the T3 on. I already have both. )