Fastest Spooling Small Turbo
05-27-06, 11:20 PM
#1
Fastest Spooling Small Turbo
Here's a question that I rarely see asked, if ever. Everyone is concerned about what the fastest turbo is to 350,400,450 rwhp. What about for smaller turbos? What's the quickest spooling turbo for 250 rwhp? At what rpm is full boost achieved, and what is full boost on the turbos mentioned? Does it hold its boost all the way until redline or does it taper off after a certain rpm?
05-27-06, 11:51 PM
#3
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how bout taking a stock turbo, porting the wastegate, full 3" exhaust, CAI and FMIC (maybe), slightly larger secondaries, and maybe some fuel management. That would get you to 250, maybe more, without having to buy a turbo, manifold to fit, external wastgate, downpipe to fit plus what I already stated
05-28-06, 12:31 AM
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Stock will do, or a BNR will work.
I dyno'd 240 at the wheels with an intake, exhaust, Rtek ecu, and no Fuel mods, but i strongly advise doing some kind of fuel mods.
I dyno'd 240 at the wheels with an intake, exhaust, Rtek ecu, and no Fuel mods, but i strongly advise doing some kind of fuel mods.
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05-28-06, 01:59 AM
#8
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you could actaully get a more efficient turbo then stock for around 250 whp, with a better designed turbine wheel that would spool it up faster and be less restrictive. as well as a better then stock exhaust manifold with an external wasteagate. the quastions is why spend all the money and effort on a setup like that to make marginal diffrance in spool and efficiency for only 250 whp. that is very little to ask from a turbo rotary, maybe you need an NA? 
05-28-06, 01:59 AM
#9
I'm not interested in the power, but the spool rates and at what rpm they make full boost, and if the boost is held all the way to redline or if it starts tapering off. If I was interested in power, I'd shoot a lot higher, say, T78, T88, GT35, etc...
I felt that the stock S4 turbo spooled a bit too slowly for my tastes, the lag was noticeable under hard cornering.
EDIT: Wow....two instances of people sneaking in while typing in one thread.....what are the odds? Kahren, do you know of any aftermarket turbo's that do have such a turbine wheel that you mentioned? I was thinking maybe a Garrett GT25R but my friend suggested a Mitsubishi 16G small wheel. I figure for 250 whp, small turbo's boosting at 8-10 psi would make such power?
I felt that the stock S4 turbo spooled a bit too slowly for my tastes, the lag was noticeable under hard cornering.
EDIT: Wow....two instances of people sneaking in while typing in one thread.....what are the odds? Kahren, do you know of any aftermarket turbo's that do have such a turbine wheel that you mentioned? I was thinking maybe a Garrett GT25R but my friend suggested a Mitsubishi 16G small wheel. I figure for 250 whp, small turbo's boosting at 8-10 psi would make such power?
Last edited by Roen; 05-28-06 at 02:07 AM.
05-30-06, 10:12 AM
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Originally Posted by carzy driver
how bout taking a stock turbo, porting the wastegate, full 3" exhaust, CAI and FMIC (maybe), slightly larger secondaries, and maybe some fuel management. That would get you to 250, maybe more, without having to buy a turbo, manifold to fit, external wastgate, downpipe to fit plus what I already stated
05-30-06, 01:38 PM
#17
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Originally Posted by Roen
the 28 spools faster than the 25?
About the same give or take 200 rpms extra on the t28bb.
You can get a gt28r, or a gt28rs which has a higher hp rating.
05-30-06, 03:30 PM
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Only difference between a t28 and a gt28r is the inconel exhaust wheel; doesnt make much of a difference. The ball bearing t28 and the gt28r might share different wheels but both are capable of the same power/spool times. Just higher efficency in the gt28r. That is all speculation since I have yet to have either apart next to each other
A gt28rs is very efficent but produces significantly less torque then a gt28r is capable of but barely anymore peak power. Personal oppinon, gt28r or a gt2871R. The 2871r will have the ability to give more peak power but with the same torque curve of the 28rs
What do you mean by lag? It gets thrown around so much incorrectly, just want to see what you actually mean
A gt28rs is very efficent but produces significantly less torque then a gt28r is capable of but barely anymore peak power. Personal oppinon, gt28r or a gt2871R. The 2871r will have the ability to give more peak power but with the same torque curve of the 28rs
What do you mean by lag? It gets thrown around so much incorrectly, just want to see what you actually mean
Last edited by uhh; 05-30-06 at 03:33 PM. Reason: needed to add on
05-30-06, 04:20 PM
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Originally Posted by Nismo Convert86
I dyno'd 240 at the wheels with an intake, exhaust, Rtek ecu, and no Fuel mods, but i strongly advise doing some kind of fuel mods.
05-30-06, 04:52 PM
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Originally Posted by twilight slide
i think he's talking more like "boost threshold"
In which case ballbearing doesnt matter since it mostly effects turbo lag and not boost threshold, the RPM range where you start making positive manifold pressure. Turbo lag is how long it takes you to start making boost after you step on the gas in the turbos functioning rpm range. Not a very good explination but some of you know and could elaborate if you felt like it.
How fast do you want the car to be?....
05-30-06, 06:54 PM
#24
Originally Posted by uhh
Turbo lag is how long it takes you to start making boost after you step on the gas in the turbos functioning rpm range. Not a very good explination but some of you know and could elaborate if you felt like it.
How fast do you want the car to be?....
How fast do you want the car to be?....
