Turbo expained please

[need boost]

Sent my turbo off a while back to chopper for a rebuild. On the tape when it came back it is listed as LT70 P-trim .63 Garr. I know its a garret turbo but the rest I could use some help on . This turbo was on my car when I bought it . Could someone explain to me exactly what this means . Thanks guys Daniel

 

[Royal-T-Ltd]

Sent my turbo off a while back to chopper for a rebuild. On the tape when it came back it is listed as LT70 P-trim .63 Garr. I know its a garret turbo but the rest I could use some help on . This turbo was on my car when I bought it . Could someone explain to me exactly what this means . Thanks guys Daniel

L Limit T Turbo 70 70 mm compressor wheel P-trim as in P Trim Exhaust wheel .63 as in .63 A/R Exhaust housing... HTH

 

[need boost]

Thanks, so basically its a 70 turbo with a 63 exhaust wheel on it correct? Daniel

 

[TurboDave]

Thanks, so basically its a 70 turbo with a 63 exhaust wheel on it correct? Daniel

Not quite.

P trim exhaust wheel. .63 A/R exhaust housing (has nothing to do with size) A/R is an area to radius calculation inside the turbine (exhaust) housing scroll area.

 

[need boost]

The guy I bought my car from told me it was a t63 big shaft turbo. So what is it then lol.

 

[ijames]

And the Garr probably means Garrett turbine (exhaust) housing, and not a Precision or Turbonetics - they all make .63 A/R housings but each is different.

 

[bison]

The guy I bought my car from told me it was a t63 big shaft turbo. So what is it then lol.

What royal t said. Pull the comp housing and measure the comp wheel if in doubt. p-trim is the same as 76 trim also

 

[RUQWKNF]

I concur.

T63 big shaft, means it has a 63mm compressor wheel, big shaft is the actual diameter of the turbine wheel's shaft. Garrett makes both a big shaft and a small shaft P-trim turbine wheel. The P-trim turbine wheel has a trim of 76.
Here is a picture that describes what A/R is.

And here is a picture that shows you how to properly measure a compressor wheel and a turbine wheel's inducer and exducers.

And again, here is the page that tells you alot more information about trim, A/R and more.

TurboByGarrett.com - Turbo Tech102

Garrett made both the big shaft and small shaft P-trim turbine wheel, so that it could be used in both T3 and T4 style bearing housings. The small shaft P-trim turbine wheel has been used in the PT67 turbos since their inception.

So if you have a LT70 P-trim turbo, Royal is correct. It is a 70mm compressor wheel, with a large shaft P-trim turbine wheel.
The .63 is the A/R of the turbine housing and depending on whether it's a Precision housing or a Garrett housing, can alter your torque converter's stall requirements. Sounds like your T63 was upgraded to a LT70 which is a very good upgrade. Should be around 50-60 flywheel hp difference between the 63 and the 70 P-trim turbos. If the label says LT70 P-trim, and it came from Limit that way, you can bank on it.
HTH

Patrick

 

[GNVYUS 1]

Looks like you need to update your sig since you got a WAY better turbo back.

Did you pay for the upgrade or confirm that what was sent was a 63 and not a 70?

After reading your sig you have some old school stuff, ditch the 7th inj and 55's if you have a 70mm now and get some 60's and alky with that double pumper so you can keep it alive at WOT with some boost.

 

[need boost]

I did not confirm when I sent it as I didn't know myself. When I bought the car years ago now the guy I got it from had bought it himself already built so he was going by what he had been told I quess. After whipping out a cam I sent the turbo off to be rebuilt as well as the metal got the seals in the turbo. I want to get an alky kit for sure but money money money lol. Going to get one someday though for sure ! With no more boost than I am running on it the 55s do fine right now still. I haven't had it over 17lbs since I built the motor up and it ran 11.77 then on pump gas. I had thought about taking off the 7th but I figured with the 55s it isn't hurting anything for sure and if it ain't broke, don't fix it lol. Thanks for all the info guys !!! Daniel Ray

 

[bison]

Looks like you need to update your sig since you got a WAY better turbo back.

Did you pay for the upgrade or confirm that what was sent was a 63 and not a 70?

After reading your sig you have some old school stuff, ditch the 7th inj and 55's if you have a 70mm now and get some 60's and alky with that double pumper so you can keep it alive at WOT with some boost.

Keep in mind that a 63 is not necessarily a better turbo. Its capable of moving more air on the compressor side if the engine can use it. Thats it. If the owner had a 63 small shaft and then got a 70 with a big shaft it would need 200-400 more stall speed to get it going. The 70 with a p-trim in a small 3 bolt exhaust housing is a mis-match of components anyway imo since the exhaust side will never come close to flowing what the 70mm comp is capable of. Look at my sig. The old combo was a 72 p-trim. The new one is a 66GTQ. Yes a smaller comp wheel and 7.5mph more in the quarter. There are other things that helped with the mph increase but the GTQ (or S trim, they are the same) was worth at least 3.5mph itself. Both had Precision .85 3 bolt housings. His biggest gains would be from a switch to a GTQ BB and a PTC NL converter. Its got 135mph capability with those parts and more injector or 55's and alky. 60's are not enough without alky to max out those parts.

 

[GNBRETT]

Keep in mind that a 63 is not necessarily a better turbo. Its capable of moving more air on the compressor side if the engine can use it. Thats it. If the owner had a 63 small shaft and then got a 70 with a big shaft it would need 200-400 more stall speed to get it going. The 70 with a p-trim in a small 3 bolt exhaust housing is a mis-match of components anyway imo since the exhaust side will never come close to flowing what the 70mm comp is capable of. Look at my sig. The old combo was a 72 p-trim. The new one is a 66GTQ. Yes a smaller comp wheel and 7.5mph more in the quarter. There are other things that helped with the mph increase but the GTQ (or S trim, they are the same) was worth at least 3.5mph itself. Both had Precision .85 3 bolt housings. His biggest gains would be from a switch to a GTQ BB and a PTC NL converter. Its got 135mph capability with those parts and more injector or 55's and alky. 60's are not enough without alky to max out those parts.

BALLS DEEP! Call me 2morow. Maybe we can meet up. Starting to gain consciousness again...

 

[bison]

Keep in mind that a 63 is not necessarily a better turbo. Its capable of moving more air on the compressor side if the engine can use it. Thats it. If the owner had a 63 small shaft and then got a 70 with a big shaft it would need 200-400 more stall speed to get it going. The 70 with a p-trim in a small 3 bolt exhaust housing is a mis-match of components anyway imo since the exhaust side will never come close to flowing what the 70mm comp is capable of. Look at my sig. The old combo was a 72 p-trim. The new one is a 66GTQ. Yes a smaller comp wheel and 7.5mph more in the quarter. There are other things that helped with the mph increase but the GTQ (or S trim, they are the same) was worth at least 3.5mph itself. Both had Precision .85 3 bolt housings. His biggest gains would be from a switch to a GTQ BB and a PTC NL converter. Its got 135mph capability with those parts and more injector or 55's and alky. 60's are not enough without alky to max out those parts.

I should have said 70 in the first sentence.