Garrett T51r

[The Dan]

Gonna supply a compressor map or just pics and no specs?

Those dimensions in the picture are wrong.

For it to be an 85 trim, the wheel diameter on the outside of the turbine has to be 87mm not 85mm as it states. If the wheel were 85mm it would make it an 89 trim.

So...if the wheel diameter is, in fact, 87mm as I suspect, then this is just a polished GT4508R

Compressor map is

http://www.turbobygarrett.com/turbobygarre..._Comp_large.gif

[T04GTR]

Will it boltup to my HKS manifold and dump that my HKS T51R SPL BB is currently fitted to?

If so whats the damage to upgrade to this turbo?

some secrets happening there ???? <_<

[jet_r31]

Those dimensions in the picture are wrong.

For it to be an 85 trim, the wheel diameter on the outside of the turbine has to be 87mm not 85mm as it states. If the wheel were 85mm it would make it an 89 trim.

So...if the wheel diameter is, in fact, 87mm as I suspect, then this is just a polished GT4508R

Compressor map is

http://www.turbobygarrett.com/turbobygarre..._Comp_large.gif

Apparently not, its a different wheel and uses a 8.2mm shaft, reading on supraforums

it sounds like the gt4708 comp wheel is better.

As for turbonetics turbos, they were shit up till the release of the new gtk lineup

with there old wheel designs, but apparently the gtk is the shit, especially if you are looking

for a big single in the gt42 size range, as as a bonus i guess they use a bigger range of

T4 housings instead like there oldschool gt66,72,76 etc range, so would make turbo matching

easier.instead

of the big T6 42 housings. I woudn't mind trying one if i was starting from scartch again

cheers

darren

[WHITER33GTS-T]

What would you recommend for a 25/30, with nos to help onto boost, and a 8200 - 8500 rev limit

[jet_r31]

a mr.turbo 76GTS with a .96 t4 housing, i would have one of them before a pos t51

garrett. Or a gt 4202 with the optional .91 T6 TA housing.

Or if you still drive it on the street a lot, the gt4294 with the T6 .91 housing

works well and isn't use much. Or even better the if you got a bit extra

coin to spend a mr. turbo Gt70GTS with the .96 housing, comes with the billet

borg warner wheel like the Precision 71GTS if you want to google that and have a

read, should spool good and still make big power, nitrous will do the rest.

have a read of the supras that run it, very popular turbo for street/strip.

I have just converted my Gt4294 to a T6 71GTS with the addition of a borg

warner billet 70/71 front wheel, Can't wait to try it

http://www.billetturbochargers.com/Hottest_new_product_1.ews

cheers

darren

Edited September 28, 2008 by jet_r31

[The Dan]

Apparently not, its a different wheel and uses a 8.2mm shaft, reading on supraforums

it sounds like the gt4708 comp wheel is better.

That's not hearsay, that's a fact. The dimensions given in that diagram calculate at a trim of 89. They are saying trim 85.

Do the math, either they have reported the wrong trim, or the wrong wheel dimension.

[jet_r31]

Don't know, i just realised it said 4508 in your post, i had 4708 in my

head for some reason

cheers

darren

Edited September 29, 2008 by jet_r31

[The Dan]

Don't know, i just realised it said 4508 in your post, i had 4708 in my

head for some reason

cheers

darren

Yeah, not sure why they have done that. It would be good to know whether they have reported the wrong trim or wheel dimension. I'm guessing it's the wrong wheel dimension. If they have mis-reported the wheel dimension then it would mean the 4508 is exactly the same turbo. Why buy HKS when Garrett have the same product for less then half price.

[Billet Ricky]

The Garrett T51R and HKS T51R SPL is the same core but are not the same covers / housings.

The GT4202, GT45 76mm inducer compressor, T51R, HKS T51R, Billet 76, Billet 74, Billet 72, Turbonetics T72, T74, T76, PTE 76, PTE 74, PTE 72 all use essentially the same compressor wheel in different trims.

Don't be fooled by thinking any of them is a newer design. They are very good comp wheels but are all same same.

The New Billet B76-GTS uses a T7 7075 billet compressor wheel that is of the same design but is stronger and lighter.

Other compressor wheels that should be looked at in this frame size are The Billet S72-GTS, Billet S75-GTS and BorgWarner S372, BorgWarner S375, BorgWarner S475. Again all these comp wheels are from the same casting but in different trims. These are extended tip technology compressor wheels (ETT). This is some technology that is fairly new to the performance seen.

These comp wheels have a much lower surge limit, flow more and are exceptionally efficient at high pressure ratios.

The Billet S72-GTS and BorgWarner S372 flow similar to a GT4202 but have a 72mm inducer. The Billet S75 and BorgWarner S475 out flow the HKS T51R SPL by around 8lb/min, have much lower surge limit, and are super efficient at high pressure ratios.

The down side to the BorgWarner’s is they are quite bulky (They are freaking huge) and are only available as Journal bush bearing turbos.

The Billet S72-GTS and S75-GTS are exactly the same size as the HKS T51R but the Billet Turbo's are about 20mm shorter than the HKS.

Here is some comp covers to compare

One of the HKS T04Z compressor covers. Note the extended defuser area.

Garrett GT4202 .69 A/R Comp Cover

Garrett T51R .72 A/R Comp Cover. The PTE comp cover is very similar to this but is a .75 A/R

Picture is of the New Billet GTSR Comp Cover as used on all the above Billet Turbo models. It can be used as a reference point for the HKS T51R Comp Cover as well, they are both very similar. Note the extended defuser area and bigger A/R

GTSR Cover is on the right

Billet B76-GTS Comp Wheel

Billet S75 and BorgWarner S475 comp wheel. This can also be used as a reference for the Billet S72 and Borg S372. Same comp wheel different trim.

Billet SB70 Compressor wheel

As Jet-r31 has mentioned the Billet SB70-GTQ and SB70-GTS are absolute animals of turbos. Now they come standard with the Billet GTSR comp cover there is not another 900hp - 950hp turbo on the planet that comes close. HKS T51R KAI, grate turbo but got nothing on the Billet SB70-GTS.

Comparison front to back of Garrett T51R, HKS T51R SPL, Billet 76-GTS, Billet B76-GTS and Billet S75-GTS

Compressor covers:

Garrett T51R has a TA .72 A/R (see picture above)

HKS T51R has a very nice light custom compressor cover with extended defuser, anti surge and larger A/R

Billet GTSR compressor cover is a light weight purpose built race cover with extended defuser area, anti surge optional, larger A/R

Compressor Wheels:

Garrett T51R, cast aluminium

HKS T51R SPL, cast aluminium

Billet 76, cast aluminium

Billet B76, T7 7075 billet aluminium, light weight and strong

Billet S75, cast aluminium, lower surge limit and flows more. Very efficient at high pressure ratios

Back Plates:

Garrett T51R, cast iron, heavy

HKS T51R SPL, ???

Billet 76, billet aluminium, light weight

Billet B76, billet aluminium, light weight

Billet S75, billet aluminium, light weight

Core:

Garrett T51R, cast iron, heavy

HKS T51R SPL, cast iron, heavy

Billet 76, billet aluminium, light weight

Billet B76, billet aluminium, light weight

Billet S75, billet aluminium, light weight

Ball bearing system:

Garrett T51R, steel ball bearings, brass bearing cage. Heavy

HKS T51R SPL, steel ball bearings, brass bearing cage. Heavy

Billet 76, high grade silicon nitride (Ceramic) ball bearings. No bearing cage, No extra drag, super light, super strong.

Billet B76, high grade silicon nitride (Ceramic) ball bearings. No bearing cage, No extra drag, super light, super strong.

Billet S75, high grade silicon nitride (Ceramic) ball bearings. No bearing cage, No extra drag, super light, super strong.

Turbines:

Garrett T51R, Old school TA51. GMR or Inconel

HKS T51R SPL, Old school TA51. Inconel

Billet GTS, Modern turbine. Inconel

Exhaust Housings:

Garrett T51R, Garrett TA exhaust housings. TA and T4 inlet

HKS T51R SPL, Very nice custom light weight. 1.00 A/R and 1.20 A/R, V/band inlet

Billet 76, Open or divided, To many A/R's s to list. T3 inlet, T04 inlet, TA inlet. Can be custom ordered with HKS or TiAL exhaust housings as well.

Billet B76, Open or divided, To many A/R's s to list. T3 inlet, T04 inlet, TA inlet. Can be custom ordered with HKS or TiAL exhaust housings as well.

Billet S75, Open or divided, To many A/R's s to list. T3 inlet, T04 inlet, TA inlet. Can be custom ordered with HKS or TiAL exhaust housings as well.

Over all size :

They are all very similar in physical size.

The Billet's are around 20mm shorter.

Lightest:

Assuming they are all in the same exhaust housing

Billet B76-GTS

Theoretical fastest spooling:

Assuming they are all in the same A/R exhaust housing.

Billet B76-GTS

Most horsepower potential:

1) Billet S75-GTS

2) Billet B76-GTS, Billet 76-GTS

3) HKS T51R SPL

4) Garrett T51R

Most expensive:

HKS T51R SPL

Cheapest:

Garrett T51R

Recommended Retail Prices:

Garrett T51R, $2600.00

HKS T51R SPL, $5350.00

Billet 76-GTS, $2850.00

Billet B76-GTS, $3100.00

Billet S75-GTS, $2950.00

Edited February 14, 2009 by Billet Ricky

[Billet Ricky]

Here is the comp map for the SB70

It will flow a bit more with the GTSR compressor cover

[Billet Ricky]

Weight difference same scales both turbos.

GT4202R = 17.2kg

Billet SB75-GTS = 8.5kg

That would be even lighter with either a TiAL exhaust housing or HKS exhaust housing.

The Billet is less than half the weight.