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Old 09-23-2007, 01:48 PM   #1
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How high could i rev safely with a t28 turbo

I been looking a getting a big T28 turbo and a tune to match and i was wondering with that bigg off turbo could i rev to 7000rpms to use the turbo to its full powerband. Would this put any extra strain on the engine as far as relibaly
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Old 09-23-2007, 02:07 PM   #2
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Rev's aren't a function of a turbo as a whole.

There a function of other hardware applications put together. On stock cams anything above 5200 is where things become inefficient due to cam profile and drop off. To goto 7000 reliably you need stiffer valve springs, different cams, and software to match the new cam profiles and other hardware.



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Old 09-23-2007, 02:22 PM   #3
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So if i add cams and valve springs it should be more reliable.
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Old 09-23-2007, 02:24 PM   #4
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the lifters are what become iffy at high rpm's although i believe the stock stuff is good to 7k. i really dont see you needing to go that far...



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Old 09-23-2007, 02:28 PM   #5
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a big t28 would run out of steam by 6000rpms
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Old 09-23-2007, 02:41 PM   #6
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so um based on that...why the hell would you want to rev farther?



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Old 09-23-2007, 02:45 PM   #7
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maybe move the power to gain some HP in the higher revs
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Old 09-23-2007, 02:46 PM   #8
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do you need to upgrade the fuel pump with a big T28. (i don't think so) just checking
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Old 09-23-2007, 02:49 PM   #9
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Higher redline isnt going to move the efficiency range of the turbo, your better off just shifting sooner - its not like your trying to hit 200mph.

And no, you dont need a fuel pump but you should have new injectors.
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Old 09-23-2007, 02:58 PM   #10
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yeah uh revving past your turbos effieciency is completly pointless.



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Old 09-23-2007, 03:10 PM   #11
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yeah uh revving past your turbos effieciency is completly pointless.
Yeah but it doesnt sound cool to say, "I shifted at 5,300."

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Old 09-23-2007, 03:17 PM   #12
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yeah i guess...i like saying i shift the honda at 9500



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Old 09-23-2007, 04:38 PM   #13
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yeah i guess...i like saying i shift the honda at 9500
You mean your motorcycle?
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Old 09-23-2007, 04:48 PM   #14
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You mean your motorcycle?
Me thinks not.
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Old 09-23-2007, 05:01 PM   #15
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yeah uh revving past your turbos effieciency is completly pointless.
Not always.

Especially if you are on a track, if you are coming down a straight and nearing the end of it, but still have a little space left - sometimes it's easier just to rev a little higher than to shift up but only have to shift back down.

This happened at the SOC track day, on the straight I could get to the end of third with some room left, but by the time I made the shift I would have to be slowing down anyways.

You guys are right though for street applications.
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Old 09-23-2007, 05:03 PM   #16
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Quote:
Originally Posted by SAAB9-3USA View Post
I been looking a getting a big T28 turbo and a tune to match and i was wondering with that bigg off turbo could i rev to 7000rpms to use the turbo to its full powerband.
Quote:
Originally Posted by SAAB9-3USA View Post
a big t28 would run out of steam by 6000rpms
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Old 09-23-2007, 05:03 PM   #17
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Quote:
Originally Posted by Champ View Post
Not always.

Especially if you are on a track, if you are coming down a straight and nearing the end of it, but still have a little space left - sometimes it's easier just to rev a little higher than to shift up but only have to shift back down.

This happened at the SOC track day, on the straight I could get to the end of third with some room left, but by the time I made the shift I would have to be slowing down anyways.

You guys are right though for street applications.
Well there are always exceptions but unless your on the track winding it out when your in that grey are before the turn otherwise you normally would be shifting.

EDIT: Coop thats awsome right there. I hadn't even noticed he had made that comment about where the t28 would run out at. Darwanism man.........right there.



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Last edited by NahumCC; 09-23-2007 at 05:08 PM.
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Old 09-23-2007, 05:36 PM   #18
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Yeah but it doesnt sound cool to say, "I shifted at 5,300."

I had the big t28, out of steam by 5500rpm in third gear, but would pull all the way to 7k in second gear.

Bye the way, I had by best run of 13.1 at 112.27mph at 6000' by shifting from third to fourth gear at 5600rpm. I tried some different rpm shift points and although I could go through the traps at 112mph in third gear at 7k, my et times were slower by winding the gt3071 that far up in the rpm band.

I went faster by keeping the turbo in the meat of the torque band and that was the best way to go fast on the track. Shifting at anything higher than 56-5700rpm was just a waste. This was with a gt3071 .64ar

With cams or a .86 turbine, you will move the power band up a few hundred rpm and then it might make more sense to run upwards of 5500rpm.

You need stiffer valve springs to rev higher than around 7k and with just stiffer springs, I have heard 7200-7500rpm is doable. If you switch the hydraulic lifters to mechanical ones, then with stiffer valve springs and cams and a large turbo, you could rev to 8-9k like the racing 93ssr guys...

John
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Old 09-23-2007, 05:56 PM   #19
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This happened at the SOC track day, on the straight I could get to the end of third with some room left, but by the time I made the shift I would have to be slowing down anyways.
This means you were not carrying enough speed through that sweeper before the long straight ;]. My car would redline in 3rd in middle of the straight, so I had to shift up early. Same thing on the short front straight where I crashed :b
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Old 09-23-2007, 06:06 PM   #20
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I was trying to say i might be able to gain a few HP by allowing 7000 rpms but the turbo would stop pulling by 6000. So i live in the county so there are quite a few corners and roads that i would like some more speed but not have to shift up only to downshift.

and yes when i am done i am planing on tracking the car eventually
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