Maxing out my turbo....question

NateS · #1 05-21-2006, 11:47 PM

Okay, so as soon as I get around to ordering a fuel pressure regulator so I can install my 650cc injectors, I plan on maxing out my T28 turbo. The turbo has a bigger compressor wheel and has "50 trim" dimentions. I am estimating that the turbo could put out close to 350hp at the crank maybe? Anyway my question is... with my upgrades am I ok to go ahead and max the turbo out once I get my parts on or am I missing some things? Thanks.

blk_srt · #2 05-21-2006, 11:50 PM

if ou dont have a mls head gasket and or arp head studs your looking at a max of 20 psi before you blow it headgasket that is

Thor06 · #3 05-22-2006, 12:05 AM

You'll need tuning/logging stuff, some pretty good race gas, and cams/SMIM will help a lot. I think that turbo is near the evo III 16g, but not quite. I think like 375 whp is about it. Without cams/SMIM I wouldnt expect to make more than like 340 on race gas, high boost pressure, and a pretty good tune.

blk_srt · #4 05-22-2006, 01:39 AM

IIRC a t28 isnt much bigger than a big 16g so your looking at making around 340hp with all the mods

crunchymilk55 · #5 05-22-2006, 01:42 AM

Quote:

Originally Posted by pr_ricer

IIRC a t28 isnt much bigger than a big 16g so your looking at making around 340hp with all the mods

it's smaller than a 16g

blk_srt · #6 05-22-2006, 01:43 AM

sbr claims "it has big 16g power" so thats what I was going off of. I thought it was smaller but couldnt back it up on short notice.

crunchymilk55 · #7 05-22-2006, 01:45 AM

it's just a T25 with a larger compressor wheel. Spools just a bit past the T25, it's a good turbo.

Don't trust vendors on everything....especially slowboy....

kjewer1 · #8 05-22-2006, 02:20 AM

That turbo should be very easy to max out on race gas. On pump, it's a little trickier.

I ran my 11.3 at 126 passes on a stock head gasket. MLS is nice, but not necessary. On a 2g especially, studs should be done for good measure, but if you don't knock you will likely get by on the stock bolts. This is a small turbo still...

On a small turbo, cams and SMIM don't increase the max HP any. They simply allow you to max out the turbo's flow at lower boost. Which is good for pump gas power, but doesn't really matter much on race gas. With larger turbos, cams and SMIM may be the only way to max them out at reasonable boost levels.

This turbo probably is close to 16g power levels. Basically a little bigger than a 14b. For comparison, a T25 flows in the low to mid 20s, a 14b maxes out at 30 lbs, small/big 16gs around 35-38 lbs, and EVO16g at ~42-43 lbs. I would expect this to end up in the low 30s, but that's pure speculation as I have no personal experience with one. If it is still using the T25 hotside your biggest problem will be turbine housing pressure and WG blowing open.

ez1286 · #9 05-22-2006, 04:13 AM

I know someone who might be selling smim's

. Someone offered me $400 to build him so it looks like it's on to round 2, me vs steel.

blk_srt · #10 05-22-2006, 12:16 PM

Quote:

Originally Posted by ez1286

I know someone who might be selling smim's

. Someone offered me $400 to build him so it looks like it's on to round 2, me vs steel.

What are you doing with the one that you already made?

NateS · #11 05-22-2006, 08:36 PM

Okay, as for logging software... I have a palm pilot with palmenstien installed on it and I have my afc for tuning. I do have arp head studs installed so I am not to worried about that. I am suprised to hear the T28 can reach over 30psi. Now that I know this I probably wouldn't take it past 25-28. It all depends on when I get everything installed and how it runs. I think I can get the basic tuning done so it is drivable but, I will probably need some help with the fine tuning. I would be happy to see 280whp from this turbo. Oh and I will be running this baby on pump gas most the time. It is going to be a light daily driver along with a weekend warrior so, pump gas will be used(93 octane).

kjewer1 · #12 05-22-2006, 10:36 PM

Over 30 lbs/min, not psi

gthompson97 · #13 05-22-2006, 11:36 PM

Quote:

Originally Posted by 95 GSXracer

Over 30 lbs/min, not psi

Thor06 · #14 05-22-2006, 11:58 PM

It is pretty amazing how many people think PSI means airflow. Its really hard to talk to anyone besides like 4 people in my town about cars because none of them have any fuckin clue what they are talking about. On of my good friends is a Honda-turned-Toyota guy. Hes a pretty good guy and knows some of what hes talking about, but man, he and basically everyone else I know here dont realize that a t25 and a t67 are going to flow different amounts of air at a given pressure.

gthompson97 · #15 05-23-2006, 12:16 AM

I don't think half the kids in my town know what a turbo does. One kid bought a "NOS" kit for his car but didn't hook it up to the motor, just the purge kit. He just drove around spraying it out all over. And then he just put in CO2 when he wasted all the "NOS" (or so he called it.) What a damn moron. And yes, he does drive a honduh.

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