SP Turbo

[Justin]

I'm not really super-intelligent about turbo terminology and I'm not getting a wack load of help over at SF. SM has always answered my questions quickly, and politely so I hope the same goes for this question....


I just fried the stock CT26 on the 88T and was considering upgrading to a SP turbo... I was told by Larry that the only one that bolts upto the downpipe and exhaust manifold is the SP61. I was thinking about getting the SP58 wheel put into the SP61 housing so I could meet my goals and still have bolton ability.

my goals are a really fast spool time, and an efficient 12-15 PSI. Will the 58 wheel give that to me? The SP61 I have heard spools around mid to late 3k... that's to slow when I only want to run 12-15 pounds...

how fast would the SP58 spool up? and would 12-15 pounds be a good operating range for this turbo?

is anyone on the board running an sp58 turbo????


_ Justin

 

[figgie]

well if i recall

the SP58 and the SP61 are about the same in price if not exactly the same. I will tell you from the car that i have driven. The sp61 spools up very nicely. I think you would not have any issues with running it BTW trust me, turbo lag is over rated and the sp is in positive pressure around 3k rpm

 

[p5150]

Just go for the 61 dude...

 

[Justin]

Why though? Wouldn't it be better to get a 58 trim for what my application is? The car will never see more than ~14 PSI so why get a turbo that wants to be at 20+ psi? If someone can give me a good reason then I'm all for it! But from what I understand (Very little ) THe 58 would be better suited... a faster spool (yeah, 3k isn't too bad, but the faster the better) and I would imagine its sweet spot would be lower.

I can't seem to find a compressor map to look at and have my buddy interperate for me



just to keep this understandable, this is a different car than the one i've been talking about a high compression setup on

 

[Anh]

SP58 is a lot of money and hard work just for 14 psi power. The CT-26 can make as much power if it held that boost.

 

[figgie]

Why though? Wouldn't it be better to get a 58 trim for what my application is? The car will never see more than ~14 PSI so why get a turbo that wants to be at 20+ psi? If someone can give me a good reason then I'm all for it! But from what I understand (Very little ) THe 58 would be better suited... a faster spool (yeah, 3k isn't too bad, but the faster the better) and I would imagine its sweet spot would be lower.

I can't seem to find a compressor map to look at and have my buddy interperate for me



just to keep this understandable, this is a different car than the one i've been talking about a high compression setup on

umm yes you don't know turbos

sp61 starts the party at 15 PSI. Once again faster spool is probably 200-500 rpm difference which i can GUARANTEE you that you won't be looking at the tach seeing when it spools. You hammer the throttle and GO.

A good reason. Hmmm cost is the same yet go with a smaller turb?? Remember psi don't mean shit. Turbos FLOW. PSI is a RESISTANCE to that flow 15psi on a ct26 is not the same as 15 psi on a sp58 which is not the same as a sp61. It is called efficency.

 

[Justin]

I just got off the phone with Ron @ HPF and he suggested a SP63 with a .58 A/R


How does that sound to you guys? Is it worth the upgrade even? I'm thinking this is going to be a much more efficient turbo, hoping anyway... will i see any power gains from it or shoudl I just bolt back on another stock turbo?

 

[Justin]

umm yes you don't know turbos

sp61 starts the party at 15 PSI. Once again faster spool is probably 200-500 rpm difference which i can GUARANTEE you that you won't be looking at the tach seeing when it spools. You hammer the throttle and GO.

A good reason. Hmmm cost is the same yet go with a smaller turb?? Remember psi don't mean shit. Turbos FLOW. PSI is a RESISTANCE to that flow 15psi on a ct26 is not the same as 15 psi on a sp58 which is not the same as a sp61. It is called efficency.

YEAH! haha. A buddy was talking to me about efficency and what not... I told ron @ hpf I wanted bolt on, quick spool, and max of 15 PSI. he recomended what I wrote above.

And you're right, I dont' know turbos, but i'm learning


wouldn't 15 psi be more efficient on a sp58 than a sp61? Cuz you said yourself the Sp61 is just getting the party started at 15 PSI, wouldn't the sp58 be more efficient around the lower boost ranges?

 

[rakkasan]

I just got off the phone with Ron @ HPF and he suggested a SP63 with a .58 A/R


How does that sound to you guys? Is it worth the upgrade even? I'm thinking this is going to be a much more efficient turbo, hoping anyway... will i see any power gains from it or shoudl I just bolt back on another stock turbo?

Just curious, what kind of money were you qouted?

 

[Justin]

same price as the sp61 on the website, a grand


anyone have any input on the turbo? please, I'd like everyone's input before I drop the money

 

[Anh]

Both SP58 and SP6X turbos provide more air than the engine can draw at 14 psi.

 

[figgie]

same price as the sp61 on the website, a grand


anyone have any input on the turbo? please, I'd like everyone's input before I drop the money

wait wait

you are bitching about the sp61 and now you want to go BIGGER with an sp63??

as i tell everyone that i talk to ... FOCUS on what you are trying to accomplish!!

 

[GrimJack]

I'd love to help, but I'm in the dark when it comes to this subject. You might check out Dr. Jonez setup, he's running a fast spooling high power turbo, IIRC.

Post your driving impressions of whatever you get please, as your goals sound awfully close to my own heart.

 

[Justin]

wait wait

you are bitching about the sp61 and now you want to go BIGGER with an sp63??

as i tell everyone that i talk to ... FOCUS on what you are trying to accomplish!!

No, I'm not bitching about anything.

First off, I've already stated I'm new to this turbo stuff, so keep it civil eh?

Secondly, I told Ron @ HPF what I wanted and that's what he suggested.

I had a friend who does understand this stuff explain it.

he says a .58 A/R is going to be a small exhaust housing which will spool up really quick, but lose efficency around 25+ PSI, which is FINE because I'm only running a max of 15 PSI

I just talked with Jeff, and he informed me that going with the larger wheel would increase efficiency with very little effect on spool time, which sounds good to me!



Edit: GrimJack, I will definatly keep everyone upto date with whatever I end up doing.

Dr Jonez is running an sp57 but he's also got a custom manifold and downpipe... i need to keep my defcon and stock manifold

 

[Anh]

Don't you listen, Justin???

If you are only running 14 psi, you can use the CT-26 and it will flow enough air to give you good power. Or just go for an upgraded CT-26.

SP turbos juuuust to run 14 psi is overkill.

 

[GrimJack]

To be perfectly honest, question like this should have horsepower goals, not PSI goals.

The SP turbo can take you well into the 400hp range. A CT26 will not.

 

[Justin]

Don't you listen, Justin???

If you are only running 14 psi, you can use the CT-26 and it will flow enough air to give you good power. Or just go for an upgraded CT-26.

SP turbos juuuust to run 14 psi is overkill.

Not even going to consider an upgraded CT26, to many people say they die quickly, and I don't want to have to go through anymore of this crap again....

Anyway, I'd spend 450 bucks on a upgraded CT26, double that (+100)and I've got an SP turbo... might as well.


Also, if I find the right setup I'm going to get a decent power gain, I would imagine. I'm sure the SP turbos flow alot more at the same PSI level.... What else would you suggest? I need somthing that will bolt on, and work with my power level. Jeff @HPF said he would talk to SP and see what they'd recommend cuz with everyone saying the SP63 is to big I called 'em back and asked him for other options

 

[figgie]

run what the DOC runs.. sp57 as he race that in auto-x. Of course if you want you can go a GT35r (ball bearing based turbo) based turbo but double the price of entry.

 

[Justin]

run what the DOC runs.. sp57 as he race that in auto-x. Of course if you want you can go a GT35r (ball bearing based turbo) based turbo but double the price of entry.

haha, yeah, ball bearing is a little out of my budget

I'm waiting from a reply from Jeff but I think if its possiable, and depending on what they have to sy abou tit i might try a SP58 with a .58 AR.... Dr J. said he was running 15-20 psi on his sp57

 

[drjonez]

Both SP58 and SP6X turbos provide more air than the engine can draw at 14 psi.

really? is that why you make MORE power with a larger turbo @ just 14 psi? is that why i made MORE power w/a SP57 @ 20 psi than i did @ 14 psi?

:thumbsdow