SP60 vs T61 vs SP63 on stock fuel

[BLITZSUPRA]

I have been debating this for a while. I know the T61 can make slightly more power than the SP60, but I have heard the SP60 is better quality. Although both of them are now discontinued, there are still a few more to be bought out there.

I am going to get another fuel pump (maybe Walbro?) to run with the stocker and add an aftermarket fuel pressure regulator to deal with the single turbo, but I still wonder if the SP63 would be safe with an otherwise stock fuel system. Whatever I get, I won't exceed 18 psi until I get a full fuel system. I don't plan to do the full fuel system upgrade for at least 6 months or more.

Any opinions?

[Steve Jarvis]

Go with the SP63.

Later, Steve

[BLITZSUPRA]

My next question would be will the SP63 fit the Turbonetics cast manifold and Racegate. I might buy the HKS GT Wastegate instead but I definitely want the cast manifold, the others are very expen$ive!

[Sound Performance]

Originally posted by BLITZSUPRA
My next question would be will the SP63 fit the Turbonetics cast manifold and Racegate. I might buy the HKS GT Wastegate instead but I definitely want the cast manifold, the others are very expen$ive!

YES it will fit.

[Grant]

I'd get a .T61 over a SP60, and a SP63 over both.

If you want fast spool, people have had good luck with the .58 T61 (625 @ 28 psi, good for such a small a/r). I think someone made 625 @ 26 psi with a .70 T61. I wouldn't use it with a .81 a/r.

Not sure if the SP63 does well with a small a/r, it won't surge or anything will it Lar? (Do not get a .58 T66 or 64, it will probably surge, my .70 T66 does a little).

[BLITZSUPRA]

I think the SP63 is pushing it a bit with stock fuel, although I will be adding another fuel pump and fuel pressure regulator.

The 625 HP/620 TQ dyno of a T61 on vache.org is basically perfect for what I want after I do a full fuel system upgrade. The car makes 400 RWTQ at 4000 rpm and doesn't ramp up too steeply compared to larger singles, and the HP is practically flat at 600+ HP from 5000 to 7000 rpm. That is a real world curve that will make your car faster than a peaky top end monster. The SP63 is even better but it will be a while before I can do fuel, and I don't want to have to be paranoid until then.

[Grant]

Originally posted by BLITZSUPRA
I think the SP63 is pushing it a bit with stock fuel, although I will be adding another fuel pump and fuel pressure regulator.

The 625 HP/620 TQ dyno of a T61 on vache.org is basically perfect for what I want after I do a full fuel system upgrade. The car makes 400 RWTQ at 4000 rpm and doesn't ramp up too steeply compared to larger singles, and the HP is practically flat at 600+ HP from 5000 to 7000 rpm. That is a real world curve that will make your car faster than a peaky top end monster. The SP63 is even better but it will be a while before I can do fuel, and I don't want to have to be paranoid until then.

Any of the above mentioned turbos can blow your motor on the stock fuel, even the SP60, if boost goes to high. If I were you, I'd go ahead and get whatever turbo your going to stick with, and take steps to ensure that boost does not get too high (like a pop-off valve). I've got bone-stock fuel right now, but I use MBC. Its screwed directly on to the racegate, and connected to the compressor housing via a AN line, very little chance of failure The car would lean out a little (fuel pressure dropped I think, or maybe the stock MAF maxing out) at 18-19 psi, but nothing really dangerous. So I just run lower boost now.

I agree with you on the T61. According to my (probably incorrect) calcs, it should work great with the stock cams. Since so few people had tried it when I selected my turbo, I went with a T66. It probably makes the same HP, but less TQ since its less effecient at lower flow rates. I probably should have trusted the compressor maps. My .70 T66 surges at little around 3-3.5k in the higher gears. I plan to eventually upgrade the a/r or cams, so hopefully the larger compressor wheel will pay off then.

I would have gone with a SP63, but it was $400 more than the price I got for my T66. Actually, a T61 .70 might be an even better choice (I didn't want to go bigger than .70 on the exhaust because of too much lag road racing).

[BLITZSUPRA]

Originally posted by Grant


I agree with you on the T61. According to my (probably incorrect) calcs, it should work great with the stock cams. Since so few people had tried it when I selected my turbo, I went with a T66. It probably makes the same HP, but less TQ since its less effecient at lower flow rates. I probably should have trusted the compressor maps. My .70 T66 surges at little around 3-3.5k in the higher gears. I plan to eventually upgrade the a/r or cams, so hopefully the larger compressor wheel will pay off then.

Exactly my point, most people don't want to build a full drag race engine and run around on race gas and 28 psi all the time. It's easier to use the full potential of the medium sized turbos without having to upgrade everything else. And 625 RWHP/620 RWTQ is nothing to sneeze at, especially with the fast spool of the T61.

[Grant]

Originally posted by BLITZSUPRA


Exactly my point, most people don't want to build a full drag race engine and run around on race gas and 28 psi all the time. It's easier to use the full potential of the medium sized turbos without having to upgrade everything else. And 625 RWHP/620 RWTQ is nothing to sneeze at, especially with the fast spool of the T61.

I don't think I'd need the spool of a T61 .58 at all. Im just as concerned about having a turbo that spools too fast as one that spools too slowly. If it spools faster than I need it to, then I need a larger a/r so I can make more top end power I don't really need a lot of torque coming out of 2nd and 3rd gear turns (which most turns are), but I do need a good amount. I need enough to let me start to power out of the turn, then I'll start and ramp up the throttle as I'm passing the apex (well it depends on the turn of course) but by then the revs are higher, and a larger turbo will be making more power.

[MKIVpowered]

Hey "C"

You seen what my car will do! Spools pretty quick and I make very decent power. My turbo is a .70 t-61.

Will

[BLITZSUPRA]

Yeah "W" I think I will be going for the T61 with a 2nd fuel pump and other minor fuel mods very soon......

[YBSLOW1]

Yeah with me having an auto TT, I have pondered over the SP60 and the T61. I have decided to go with the T61 with a .58 a/r with second fuel pump and by pass same as C. Until I upgrade my tranny, then I will jump to a .70 with fuel done completely. Yeah Will, I know what your MKIII is capable of and I want to ride on a daily basis knowing I have 450-470rwhp on tap. I can live with the idea of reaching 625rwhp max.

[Steve Jarvis]

I had my first chance to drive an SP57 powered car this weekend. You won't go wrong with either an SP57 or SP63, but I still prefered the SP63. The SP57 spooled more quickly and looked significantly more responsive on the dyno. In real life the spool up felt very similiar. I can run 1.5psi less with my SP63 and make the same power. I can also make more power on pump gas. Also at the roadcourse the SP63 should be more robust because it has the same bearings and shafts of the larger SP turbo's.

Maybe Kflee (the SP57 owner) will respond, or you can PM him.

Later, Steve

[kflee]

Steve is right. I have the SP57 and the spool up is quicker. But, real world I get an initial half a car length on Steve's SP63 if both of us start in 3rd gear at about 3000 rpm. Now, how often is that going to happen?? Never! I guarantee next time Steve and I line up on the street he will be brake boosting and eat my lunch.

All that being said, I am very happy with my turbo and like Steve said, you can't go wrong with either SP57 or SP63.

Kirk

[AZMongoose]

I am the owner of the T61 624rwhp/621 tq car and I can honestly say I couldent be any happier with the t61/.58 combo!

[BLITZSUPRA]

Originally posted by AZMongoose
I am the owner of the T61 624rwhp/621 tq car and I can honestly say I couldent be any happier with the t61/.58 combo!

Nice to hear, I bought the T61 and hope to have a curve like that soon! Do you have any 1/4 mile times at high boost? What is the rest of your setup like (clutch/tires/etc.)?

[MKIVpowered]

Hey C

Make sure your injectors are cleaned and or flow tested. the t-61 will flow alot of air so you want to make sure the fuel is there. Hince I'm still at 550rwhp. 550cc injectors will be pushed to the edge so watch the boost.