Changing from ball bearing to journal bearing got ?'s

[kamon8404]

Any certain color smoke?

 

[Shadow102]

Any certain color smoke?

blue or possibly white since the cartridge is water cooled. I get alot of smoke under decel.

 

[magnumP5]

Hmm well I'm definitely not having that issue but I'll know what to think if that comes up. Personally I say go with the GT28RS, the T25 is just too slow spool wise - not really useful with these cars.

 

[thepepperman]

Umm from what I've read on the forum I thought the GT28RS actually spooled a little slower than the stock T25? Or at least around the same RPM range? My T25 is on boost by 25-2800rpms.

 

[Shadow102]

Hmm well I'm definitely not having that issue but I'll know what to think if that comes up. Personally I say go with the GT28RS, the T25 is just too slow spool wise - not really useful with these cars.

i am driving around a p5 right now with a gt28rs with more mods to it and its making less hp than my msp. I rly dont like the way it feels compared to the t25. I will rly be able to form a full opinion this weekend as i am going to pick up my turbo in a little bit and its going on this saturday

 

[magnumP5]

i am driving around a p5 right now with a gt28rs with more mods to it and its making less hp than my msp. I rly dont like the way it feels compared to the t25. I will rly be able to form a full opinion this weekend as i am going to pick up my turbo in a little bit and its going on this saturday

I'd definitely like to hear the results. I am currently debating whether or not to stay with the GT25R orr go bigger. I wanted to shoot for 300whp but I'm not sure I want to put that much more effort into this car.

 

[orng1]

I would go wit a bigger turbo if your going to try to make 300whp. It's real hard to make that much power if your going to stick with the stocker.

 

[2.0t03speed]

maybe its just the car that was making that non bb t25 spool slow. because i turboed my ka24 in my 240sx with a t25 off a sr20det and i was at full spool at about 2200-2500(dunno)

 

[thepepperman]

maybe its just the car that was making that non bb t25 spool slow. because i turboed my ka24 in my 240sx with a t25 off a sr20det and i was at full spool at about 2200-2500(dunno)

Remember the ka24 is a 2.4L motor so at a given rpm it will be pushing approximately 20% more airflow than the 2.0L FS-DE, meaning the same turbo (ie the T25) on the larger engine will spool much faster.

 

[orng1]

My stock turbo spooled way to quick for any good launches, I'd get boost at around 1800rpm.

 

[Speed_Racer]

Apexi AVC-R? or you could pull timing down low if have a piggy back etc... or are we looking for inexpensive ways to slow spool.

or you could just do like the old school msp pioneers and launch in 2nd. lol

 

[crashkelly]

Umm from what I've read on the forum I thought the GT28RS actually spooled a little slower than the stock T25? Or at least around the same RPM range? My T25 is on boost by 25-2800rpms.

Thats what i thought...the gt28 spools slower because it needs to take a larger volume of air to start the spool...but produces more hp because of the large volume of air being blown into the engine?

 

[Shadow102]

Thats what i thought...the gt28 spools slower because it needs to take a larger volume of air to start the spool...but produces more hp because of the large volume of air being blown into the engine?

its more effiecient basically. Every turbo has a certain efficency range. If you learn to read compresor maps (good luck) its gives you a good indication of how to match a turbo to your specific application so it will be used most effectivly

 

[crashkelly]

its more effiecient basically. Every turbo has a certain efficency range. If you learn to read compresor maps (good luck) its gives you a good indication of how to match a turbo to your specific application so it will be used most effectivly

ah gotcha

 

[Shadow102]

ah gotcha

same kinda deal with intercoolers. My FMIC is way overkill or over effecient and ends up hurting more than helping

 

[orng1]

Wow that has got to be a big intercooler, which one do you have? I have a pretty big spearco but it fills the grill perfectly.

 

[Shadow102]

Wow that has got to be a big intercooler, which one do you have? I have a pretty big spearco but it fills the grill perfectly.

I am running the perrin FMIC. An upgraded side mount is perfect for what the engine can handle boost wise

 

[orng1]

Yeah that's the big one, mine is custom. I'd been running 12-14psi with no issues with the MPI so I needed something a bit bigger than a side mount.

 

[CustomMSP]

I'm using a 50 Trim Journal Bearing T3 (.42 Compressor / .48 Exhaust), and to be honest the spoolup is pretty much the same as the stock GT25. The benifits of a larger turbine housing is that the engine is allowed much greater air flow, therefore it becomes more efficient overall with less backpressure. You loose a little bit of torque down low, but the highend gain is very nice. Plus, I now have traction in first gear because there's no spike of torque in the mid range

 

[orng1]

Yay for a usable 1st gear, great selection on the turbo.