More power from a gt28rs?

E

edaddeemsp

Member
:
2003.5 mazdaspeed
I now know from reading through some of the other forums that the factory t25 can be "reworked", to be able to handle at least 300 h.p., by using a different compressor wheel, and some machine work. Is it possible to do that to a gt28rs. My ultimate goal with my car is 400+ h.p., which will be for street/strip, so I want to keep a lower rpm spool time. Just curious if anyone has tried anything like this, or if there is a different turbo that will still give a good spool, but will also be able to support more than 350 h.p.? Any suggestions?
 
Thnks for the reply and advice. So going off the info from the website, that turbo will bolt right up to the stock mani? I hope cause thats about exactly what i was lookin for.
 
maybe if he ported the stock manifold it could at least get him up and running. then later upgrade when the $ is not a problem.
 
that would work, however a ported stock mani is that much more prone to cracking. and a few on the forum have craked their stock mani's without any porting.

but like you said, its much cheaper than getting a nice tubular manifold. MAM has their MSP manifold which is awesome. but you have to pay to play
 
Yah, money is the key for the power. I've seen the mam mani,wow, but I also looked into the mam thumper kit. As of now I still don't have a fmic, also I'm in need of a mani, and turbo upgrade of some type, so I have to look further into that whole kit as well. Actually, i'm waiting for beau to reply back in regards to the thumper. His first email said that the thumper would be a good investment, especially if I'm looking for 400+whp. I don't mind having to save for a while to get the product that's going to work best for my needs, just gotta get my game plan down, so I know how much I'll need. Again, thanks for all the input.
 
its true, if you want 400+ HP the thumper is a better investment, because the turbo used wont work NEARLY as hard to make it there as a GT28 variant. not to mention the thumper mani has larger runners (I think) than the MSP one. so less backpressure

besides, it comes with the FMIC already. though unless you get an AEM your MAF will be a serious choke point for a 400+ HP car
 
MAMotrosports does wonders.

A general ideal:

Garrett GT Technology
Garretts line of GT Technology turbochargers offer state of the art technology and the latest aerodynamic designs for maximum airflow. Water cooled ball bearing center sections are available on selcted models. As an authorized Garrett GT Performance Distributors, Precision offers an extensive offering of Garrett products in addition to our own line of performance turbochargers and accessories.

<TABLE cellSpacing=2 cellPadding=5 width=700 border=0><TBODY><TR bgColor=#666666><TD vAlign=bottom width=35>Max. </TD><TD vAlign=bottom width=37></TD><TD vAlign=bottom width=154 colSpan=3>Garrett Compressor Specs </TD><TD vAlign=bottom width=58></TD><TD vAlign=bottom width=158 colSpan=3>Garrett Turbine Specs </TD><TD width=62></TD></TR><TR bgColor=#000000><TD vAlign=bottom>Rated </TD><TD vAlign=bottom>Part </TD><TD vAlign=bottom>Wheel </TD><TD vAlign=bottom>Wheel </TD><TD vAlign=bottom>List </TD><TD vAlign=bottom>Bearing </TD><TD vAlign=bottom width=40>Wheel </TD><TD vAlign=bottom width=36>Wheel </TD><TD vAlign=bottom width=82>A/R </TD><TD vAlign=bottom width=62>List </TD></TR><TR bgColor=#000000><TD vAlign=bottom>HP </TD><TD vAlign=bottom>No. </TD><TD vAlign=bottom>Dia. </TD><TD vAlign=bottom>Trim </TD><TD vAlign=bottom>Price </TD><TD vAlign=bottom>System </TD><TD vAlign=bottom>Dia. </TD><TD vAlign=bottom width=39>Trim </TD><TD vAlign=bottom width=82>Ratio </TD><TD vAlign=bottom width=62>Price </TD></TR><TR bgColor=#3f3f3f><TD vAlign=bottom>130 </TD><TD vAlign=bottom>GT-12 </TD><TD vAlign=bottom>41mm </TD><TD vAlign=bottom>50 </TD><TD vAlign=bottom>0.38 </TD><TD vAlign=bottom>Standard </TD><TD vAlign=bottom>35.5mm </TD><TD vAlign=bottom width=39>72 </TD><TD vAlign=bottom width=82>0.43 </TD><TD vAlign=bottom width=62>$690.00 </TD></TR><TR bgColor=#3f3f3f><TD vAlign=bottom>220 </TD><TD vAlign=bottom>GT-15 </TD><TD vAlign=bottom>45mm </TD><TD vAlign=bottom>60 </TD><TD vAlign=bottom>0.48 </TD><TD vAlign=bottom>Standard </TD><TD vAlign=bottom>41.2mm </TD><TD vAlign=bottom width=39>72 </TD><TD vAlign=bottom width=82>0.35 </TD><TD vAlign=bottom width=62>$690.00 </TD></TR><TR bgColor=#3f3f3f><TD vAlign=bottom>260 </TD><TD vAlign=bottom>GT-20 </TD><TD vAlign=bottom>56mm </TD><TD vAlign=bottom>55 </TD><TD vAlign=bottom>0.53 </TD><TD vAlign=bottom>Standard </TD><TD vAlign=bottom>47mm </TD><TD vAlign=bottom width=39>72 </TD><TD vAlign=bottom width=82>0.46 </TD><TD vAlign=bottom width=62>$750.00 </TD></TR><TR bgColor=#3f3f3f><TD vAlign=bottom>280 </TD><TD vAlign=bottom>GT-22 </TD><TD vAlign=bottom>52mm </TD><TD vAlign=bottom>60 </TD><TD vAlign=bottom>0.51 </TD><TD vAlign=bottom>Standard </TD><TD vAlign=bottom>50.3mm </TD><TD vAlign=bottom width=39>72 </TD><TD vAlign=bottom width=82>0.56, 0.67 </TD><TD vAlign=bottom width=62>$750.00 </TD></TR><TR bgColor=#3f3f3f><TD vAlign=bottom></TD><TD vAlign=bottom></TD><TD vAlign=bottom>59.41mm </TD><TD vAlign=bottom>52 </TD><TD vAlign=bottom>0.42 </TD><TD vAlign=bottom>Standard </TD><TD vAlign=bottom>50.3mm </TD><TD vAlign=bottom width=39>72 </TD><TD vAlign=bottom width=82>0.56, 0.67 </TD><TD vAlign=bottom width=62>$747.50 </TD></TR><TR bgColor=#3f3f3f><TD vAlign=bottom>320 </TD><TD vAlign=bottom>GT-28R </TD><TD vAlign=bottom>Call </TD><TD vAlign=bottom>CALL </TD><TD vAlign=bottom>0.60 </TD><TD vAlign=bottom>Ball Bearing </TD><TD vAlign=bottom>50.3mm </TD><TD vAlign=bottom width=39>62 </TD><TD vAlign=bottom width=82>0.64 </TD><TD vAlign=bottom width=62>$960.00 </TD></TR><TR bgColor=#3f3f3f><TD vAlign=bottom>500 </TD><TD vAlign=bottom>GT-30R </TD><TD vAlign=bottom>76.2 mm </TD><TD vAlign=bottom>56 </TD><TD vAlign=bottom>0.60 </TD><TD vAlign=bottom>Ball Bearing </TD><TD vAlign=bottom>60mm </TD><TD vAlign=bottom width=39>84 </TD><TD vAlign=bottom width=82>CALL </TD><TD vAlign=bottom width=62>$1187.50 </TD></TR><TR bgColor=#3f3f3f><TD vAlign=bottom>520 </TD><TD vAlign=bottom>GT-32 </TD><TD vAlign=bottom>71, 76mm </TD><TD vAlign=bottom>52 </TD><TD vAlign=bottom>0.50 </TD><TD vAlign=bottom>Standard </TD><TD vAlign=bottom>64 mm </TD><TD vAlign=bottom width=39>73 </TD><TD vAlign=bottom width=82>0.78 </TD><TD vAlign=bottom width=62>$812.50 </TD></TR><TR bgColor=#3f3f3f><TD vAlign=bottom>660 </TD><TD vAlign=bottom>GT-35 </TD><TD vAlign=bottom>71, 76mm </TD><TD vAlign=bottom>52 </TD><TD vAlign=bottom>0.50, 0.60 </TD><TD vAlign=bottom>Standard </TD><TD vAlign=bottom>68mm </TD><TD vAlign=bottom width=39>84 </TD><TD vAlign=bottom width=82>1.18 </TD><TD vAlign=bottom width=62>$1150.00 </TD></TR><TR bgColor=#3f3f3f><TD vAlign=bottom>680 </TD><TD vAlign=bottom>GT-35R </TD><TD vAlign=bottom>82mm </TD><TD vAlign=bottom>56 </TD><TD vAlign=bottom>0.70 </TD><TD vAlign=bottom>Ball Bearing </TD><TD vAlign=bottom>68mm </TD><TD vAlign=bottom width=39>84 </TD><TD vAlign=bottom width=82>0.82, 1.06 </TD><TD vAlign=bottom width=62>$1897.50 </TD></TR><TR bgColor=#3f3f3f><TD vAlign=bottom>700 </TD><TD vAlign=bottom>GT-37 </TD><TD vAlign=bottom>76mm, 82mm </TD><TD vAlign=bottom>52 </TD><TD vAlign=bottom>0.54, 0.70 </TD><TD vAlign=bottom>Standard </TD><TD vAlign=bottom>72.5mm </TD><TD vAlign=bottom width=39>84 </TD><TD vAlign=bottom width=82>1.12 </TD><TD vAlign=bottom width=62>$875.00 </TD></TR><TR bgColor=#3f3f3f><TD vAlign=bottom>750 </TD><TD vAlign=bottom>GT-40 </TD><TD vAlign=bottom>82mm, 88mm </TD><TD vAlign=bottom>50, 54 </TD><TD vAlign=bottom>0.58, 0.72 </TD><TD vAlign=bottom>Standard </TD><TD vAlign=bottom>77mm </TD><TD vAlign=bottom width=39>73, 84 </TD><TD vAlign=bottom width=82>0.94, 1.34 </TD><TD vAlign=bottom width=62>$937.50 </TD></TR><TR bgColor=#3f3f3f><TD vAlign=bottom>1,100 </TD><TD vAlign=bottom>GT-42 </TD><TD vAlign=bottom>94mm, 102mm </TD><TD vAlign=bottom>53, 56 </TD><TD vAlign=bottom>0.60 </TD><TD vAlign=bottom>Standard </TD><TD vAlign=bottom>82mm </TD><TD vAlign=bottom width=39>84 </TD><TD vAlign=bottom width=82>1.15 </TD><TD vAlign=bottom width=62>$1035.00 </TD></TR><TR bgColor=#3f3f3f><TD vAlign=bottom>1,100 </TD><TD vAlign=bottom>GT42R </TD><TD vAlign=bottom>94mm, 102mm </TD><TD vAlign=bottom>53, 56 </TD><TD vAlign=bottom>0.60 </TD><TD vAlign=bottom>Ball Bearing </TD><TD vAlign=bottom>82mm </TD><TD vAlign=bottom width=39>84 </TD><TD vAlign=bottom width=82>1.15 </TD><TD vAlign=bottom width=62>Call </TD></TR><TR bgColor=#3f3f3f><TD vAlign=bottom>2,200 </TD><TD vAlign=bottom>GT-60 </TD><TD vAlign=bottom>141mm </TD><TD vAlign=bottom>56 </TD><TD vAlign=bottom>1.05 </TD><TD vAlign=bottom>Standard </TD><TD vAlign=bottom>130mm </TD><TD vAlign=bottom width=39>84 </TD><TD vAlign=bottom width=82>1.47 </TD><TD vAlign=bottom width=62>$4625.00 </TD></TR></TBODY></TABLE>
 
I think I'm going to get rid of my setup and buy a gas-turbine engine(boom03) . Really, I would like to hear more about the GT2871R turbo. Does it retain the same housing as the RS so there would be little modification to fit it into the stock location?
 
mspdfreak said:
I'll take the GT-60.....to go, please.
Click to expand...
lol...im sure it will be a hot item for supra...then they can brag about driving a 2,000 supra! T88H is sooooo 2003

00257.jpg
 
The GT28RS and GT2871 share the same parts.The only difference is the compressor wheel(GT2871 uses a 71mm).The Compressor cover is the same one, but machined out to fit the larger wheel.
 
edaddeemsp said:
I now know from reading through some of the other forums that the factory t25 can be "reworked", to be able to handle at least 300 h.p., by using a different compressor wheel, and some machine work. Is it possible to do that to a gt28rs. My ultimate goal with my car is 400+ h.p., which will be for street/strip, so I want to keep a lower rpm spool time. Just curious if anyone has tried anything like this, or if there is a different turbo that will still give a good spool, but will also be able to support more than 350 h.p.? Any suggestions?
Click to expand...
I can let you know for sure in a few weeks. We are doing a 400whp Speed right now. Hoping to be around 400 hp at the wheels.

GT28RS/71 turbo
Ported stock exhaust manfiold
Ported stock intake.
MPI Stage III cylinder head.
Ion exhaust system.
MPI short block
MPI custom intercooler
MPI Tuner, with staged injectors in intake.
MPI 80mm MAF
MPI high output ignition system
24psi and C16 fuel
Some very good luck.

Not sure if we would hit a wall in air flow with the turbo or to much back pressure in the exhuast, But this is why we play the game. To find out for sure, no more guessing what will or will not work. Lets get some facts for once.
 
EXCELENT JOB...cant wait. Agree with you 100% lets see what can be done instead of theorize. This should be good!
 
Since we are talking turbo's here. How efficient would it be to just upgrade our turbo to the GT28RS. I'm only looking to get a max of about 275 to 290 whp out of my car. Would it be as simple as swapping the two out and going on with every day business. Or would I need another manifold to help me. I know our manifold will work, but is this recommended..

Of course this is after: pistons/rods , and removal of the Unichip ( possibly ) for some other kind of engine management.
 
I'd bet the unichip could be tuned for that... I just wouldn't want to pay for it. You could get a haltech or MPI and a laptop for the tuning time you'd pay for with the chip.
 
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