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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 06-26-2007, 08:23 AM   #1
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T28 upgrade?

So, my buddy Derek has a Nissan Sentra SE-R. It's a quick little car, especially for being a $500 beater. He's done some modding (like a $600 set of cams). And our cars are about equal in the 1/4 mile. He might actually be about .2 seconds faster than me, but I'm trapping about 10mph faster (via G-Tech meter).

He now wants to go turbo with his SR20 motor. Especially now that his Mk3 supra has a blown 5th cylinder and he's waiting on a new engine.

He picked up a T28 turbo, one of the twins off a Skyline RB26. It's a garrett ball bearing, but he doesn't know much more about it. He then found out that the turbo is too big for the injectors he bought and now wants to trade straight up for a Saab or Nissan T25 with internal wastegate ~6-8psi base boost.

My question is, I don't know much about this T28 turbo. How much of a direct swap would this be for me, if I were to trade him straight up for my current T25?

What other supporting hardware/software would I need? Would I need a new exhaust manifold? Would my Stage 3+ ECU end up leaning out? Would this turbo get me to the 300+whp mark?

If I can pretty much bolt this turbo on, and not have to get a new ECU tune, then I'll go for it. But if I need a new tune and much more hardware than injectors, then I'll wait and go straight for the GT30 series.
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Old 06-26-2007, 08:26 AM   #2
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As long as the flange matches the exhuast manifold its all good. You might need new lines (I don't know if the t25 and t28 share the same center section). You would need new software as the t28 will flow more than the t25 leading you to lean out.

If I were you I'd go for it. Free turbo by trading your old (and probably tired ) t25 turbo and then its just the cost of a software update.



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Old 06-26-2007, 01:09 PM   #3
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Hmm... Do I really want to spend another $500+ on software just yet? Or should I get tires for both cars first?
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Old 06-26-2007, 01:12 PM   #4
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You will not need new softwar, I have been using a machined out t28 since 03 or 04 with no problems.

Can you get some pics of the turbo. I have on in my gallery section, and could drag up another.
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Old 06-26-2007, 01:59 PM   #5
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Hmm... Do I really want to spend another $500+ on software just yet? Or should I get tires for both cars first?

What the hell.

You have not bought tires yet?

Saftey is becoming an issue. I would not have gone 2 miles on the tires you have on your NG.
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Old 06-26-2007, 02:04 PM   #6
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Hmm... Do I really want to spend another $500+ on software just yet? Or should I get tires for both cars first?
Tires > suspension > gofast.
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Old 06-26-2007, 02:11 PM   #7
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i have been in amish car on I35. with new tires he might actually gain speed right now he could turn the set he has on there into slicks
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Old 06-26-2007, 02:22 PM   #8
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i have been in amish car on I35. with new tires he might actually gain speed right now he could turn the set he has on there into slicks

Ha.

I seem to think they are already slicks, and a danger in the rain.
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Old 06-26-2007, 02:28 PM   #9
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oh just do the trade, tires arent bad till they look like this:





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Old 06-26-2007, 02:36 PM   #10
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haha!

Don't encourage him Paul!

I think he carries his kid in this car.
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Old 06-26-2007, 03:55 PM   #11
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I honestlly didnt think that any T28 turbos were BB. Also, with the Nissan engines, you will have to have a custom made turbo inlet/exit pipe. They are different than what the Saab uses.
You will be able to manage without software but there will be a minute difference power wise. Save the trouble, keep your turbo.
Side note...The american SE-Rs were non turbo with the KA engines. Did he buy the car with the SR20 in it? or upgrade to it?
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Old 06-26-2007, 04:16 PM   #12
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I honestlly didnt think that any T28 turbos were BB. Also, with the Nissan engines, you will have to have a custom made turbo inlet/exit pipe. They are different than what the Saab uses.
You will be able to manage without software but there will be a minute difference power wise. Save the trouble, keep your turbo.
Side note...The american SE-Rs were non turbo with the KA engines. Did he buy the car with the SR20 in it? or upgrade to it?
That was the 240sx was the KA24 but the older style nissan sentra B13 had a NA SR20
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Old 06-26-2007, 04:36 PM   #13
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That was the 240sx was the KA24 but the older style nissan sentra B13 had a NA SR20
good to know
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Old 06-26-2007, 09:03 PM   #14
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Tires > suspension > gofast.
No, no, no. That's not how Amish rolls! It's more like...

wheels with no tires > another set of wheels with no tires > replica whale tail > ng900 roof spoiler > stage 3 ECU > 3" DP > ebay FMIC and tubing > tires

tires are really not as important as you would think....they don't do much for safety or performance.
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Old 06-27-2007, 06:35 AM   #15
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I actually haven't had my son in my car for the past 4 months. We tend to use the freestyle rather than swapping car seats all the time.



And yes, this is a B13 sentra SE-R with the SR20. It was formerly used as an Ice Racer before Derek bought it.


The turbo in question IS a ball bearing turbo. I have yet to get pics of it, or more information on the trims etc. If this turbo would get me to 300+whp I'll probably end up going for it, and leave the 400+hp goal for another car.
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Old 06-27-2007, 06:37 AM   #16
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Quote:
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oh just do the trade, tires arent bad till they look like this:





Paul
At least my tires still have tread left on them! They're just barely legal. The tires on my NG are still better than than the tires on my SPG

I think this afternoon I'm going to rotate my wheels, and put the H-rated potenzas that are currently in the front to the rear, and put the Z-rated Goodyear eagles back in front. The eagles still have good tread.
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