Turbo Q's and opinions

[DustyR/T]

Ok, I have been pokin around for a turbocharger the last few weeks and wondered if people here can help me out. Which one should I go w/? I was thinking a T04E w/ a 50 trim. Being new to turbo's in general, I don't want to make a bad purchase. I have some headwork done, large overbore, and basic 3L bolt on's. I want something to kick me in the pants when I floor it around 3000RPM but keep pulling strong to the redline. My expected max power is 400-425FWHP and around 450-500Ft/lbs on max boost but be tuned down to 280HP-~300ft-lbs for the street. I don't know all the perks to internal/external gating, boost adjustment, etc. I've been looking in some books regarding turbo/supercharging and they help. But what would probably give me what I wanted? Also, is a BB turbo THAT much better?

[Dusty_Duster]

Quote:

Originally Posted by DustyR/T Ok, I have been pokin around for a turbocharger the last few weeks and wondered if people here can help me out. Which one should I go w/? I was thinking a T04E w/ a 50 trim. Being new to turbo's in general, I don't want to make a bad purchase. I have some headwork done, large overbore, and basic 3L bolt on's. I want something to kick me in the pants when I floor it around 3000RPM but keep pulling strong to the redline. My expected max power is 400-425FWHP and around 450-500Ft/lbs on max boost but be tuned down to 280HP-~300ft-lbs for the street. I don't know all the perks to internal/external gating, boost adjustment, etc. I've been looking in some books regarding turbo/supercharging and they help. But what would probably give me what I wanted? Also, is a BB turbo THAT much better?

What turbo was used on the 3000GTs? That might be a start.

[mwinkle353]

get a 60-1, T61, or a TS04. With what you've done to your motor, any of these turbos will be greatly matched.

[kreel]

Quote:

Originally Posted by Dusty_Duster What turbo was used on the 3000GTs? That might be a start.

3000GTs use 9b turbo's...waaaaaaaaaay too small for you

[Dusty_Duster]

Quote:

Originally Posted by kreel 3000GTs use 9b turbo's...waaaaaaaaaay too small for you

I forgot 3000GTs are twin-turbocharged.

[Ondonti]

Quote:

Originally Posted by mwinkle353 get a 60-1, T61, or a TS04. With what you've done to your motor, any of these turbos will be greatly matched.

Or a gt35r
basically the turbo I should have bought. Smaller, newer tech (btw you dont have to get the BB because I think that turbo will spool amazingly well with its better design) could still make 600whp easy but you dont have to push it that far. It would be quite happy making 300-400, be very efficient, and hopefully not blow your tires away off idle.

[kreel]

Since I'm going to be in the same boat in probably a year down the road, I'll ask this now. Would it be better to use some T3/T4 hybrid or strictly a T4 turbo? My apologies if this has been answered already. My turbo knowledge is "average" at best. Still learning

BTW, my 3.0L will have all the basic bolt-ons, possibly a large overbore, heavily ported heads (crossing fingers here), and equal length headers (really crossing fingers here).

[irocelectric93]

So would the Garrett gt35r be sized right though? It just seems like the turbine a/r would be too big? I could be wrong though. I know that since its a bb it spools better and all that.

[mwinkle353]

Well, a well respected turbo rebuilder has given me some insight on the proper sizing of turbo for our cars.

He recommends a T04E 50 or 60 trim, T04B V trim or 60-1, or a TD06-20G. The turbines he's recommends range from a stage III T3 in a .63 A/R housing, the T4 "O" trim in a .68 housing, or a T4 "P" trim in either a .50 or .58 A/R housing.

The T04E 50 trim should be mated to the T3 stage III .63 A/R housing; for a decent street turbo (quick spooling and decent flow up to redline). The T04B compressors should be mated to the T4 turbines, due to their surge line shape. You don't want these turbos spooling too fast, resulting in bad surges at higher pressure ratios in lower rpms.


Just my $0.02

Wink

[irocelectric93]

So basically the first turbo i was looking at sounds right. To4e turbonetics hybrid with 50 trim and .63 a/r turbine housing. Im sort of looking more into a gt concepts or garrett turbo now though....i kinda cant choose. I just want something that wont kill my checkbook but be able to generate 350-400 horse.

[Ondonti]

The Gt35R is not a "huge" turbo. People run it on their 2.0L street cars. Frank tells me he would expect full boost in the mid/high 3000 rpms.

Really I dont know why people look at the to4e turbos anymore. the gt series turbos have larger turbines but spool faster because they are flat out designed better. t3 turbine wheels are HORRIBLY Designed. The t4 wheel I have is much bigger then a stage V t3 but spools about the same or better simply because of better design. (and a t4 wheel is pretty oldschool).

A precision sc6152 is basically a gt35R with no ball bearing. I believe you get get these new for the same price as a 50 trim. Ball bearing is NOT the main advantage of these newer style turbos. If you can get the same price then you should move up to the better turbos. Like I said, I should have gone with this turbo. Current turbo I have is a 750whp beast which isnt very realistic.

Beware the Ebay turbos unless you really know what you are getting into. The ebay turbo I used was actually very nice to drive but depending on your expectations you might be really upset by it.

[irocelectric93]

Thanks for the info brent you actually just won me over to the gt35r....even though i was already leaning that way. Ive been doing some research lately on ball bearing turbos as it is.

[Ondonti]

Just remember, the advantage of these turbos is the better design, higher efficiencies, quicker spool...and thats WITHOUT THE DBB.
Comparing 1960's turbos to those designed in 2000.

The precision sc6152 is basically a gt35R without DBB and they are about the same price as a to4e/t3 turbo.

If you have $$$ then the DBB is probably a cool option. Its only supposed to make a 300rpm or so different in where your turbo spools (based on real cars not what the people selling it say).

[DustyR/T]

what trim size on the GT35r is recommended?

[irocelectric93]

I was just going to ask that too dusty and i can't find a gt35r that isn't DBB. Any ideas on where i might find one?

Actually i just looked at turboelements.com and found a turbo for about 775 bucks before shipped witha gt35r compressor. Non BB i believe.