What's the difference between the GT42R and the T51R SPL?

Which turbo would you choose?

Also, has anyone heard of a KFG-T51R from http://members.shaw.ca/kfgroup/Turbo_&_Upgrades.htm

 

hmmm..that stuff looks familiar.....
http://members.shaw.ca/kfgroup/Turbo...m#Mazda%20RX-7

 

If the cartridges are indeed BRAND NEW Genuwine Garrett cartridges, this may be the ticket!

 

Who wants to be the guinea pig?


-Ted

 

hahaha, I did that for a couple of years looking for a set-up that would please me

 

I would love to run a T51R BB, but no ways I'm spending the money for that overpriced HKS turbo!
So I've decided to go twin GT28R's.


-Ted

 

So, that turbo is basically a Kai (comp wheel and turbine wheel sizes look exact), but has a standard, non-surge compressor housing (not always a bad thing), and the turbine wheel looks like a GT42. Another good detail is the TA-45 based circular section volute on the hot side (large diesel engine use), which is supposed to be more efficient (I've read +30%) than a square section volute.

I still wonder how or why it is rated a 900 hp turbo; perhaps it is due to the likely higher flowing GT42 turbine wheel, and perhaps the deletion of the anti-surge comp housing. The price is pretty amazing, however

Has anyone tried out this turbo?

 

I'd be a little wary of buying any products from a company that sells "Mazda B13 RX-7 Turbo Headers", but that price is great if the turbo is legit.

I wonder how much their manifold ("turbo header" lol) costs?

 

I'm still curious about the difference between the GT42R and the T51R SPL, besides the price of the two turbos?

I just want to know the performance spec's of the two. From what i heard that the GT42R givea a better boost response and that the T51R SPL has power potential. Just want to know more about the two turbos.
If anyone can help me.

Thanks

 

the garret gt42r is a 76mm compressor and 96mm exhaust w/ ball bearing. I'm not sure on the HKS

 

I have never run a gt42 or anything like that, just a T04e 60 trim with p trim 1.15 divided, currently I run a hks T51s which is the same as non BB Kai, with a standard t04 flange, I have spent some time tuning on a dyno with both a T51 kai and SPl as well as hks To4r, s and z
Alot of people think hks is to much money, yeah they are expensive, but once you've driven something with an HKS turbo, there is almost no going back.. I have read alot of posts about people complaining about Garrett turbos in that size range being lag monster, no boost till 5000 rpm, sometimes only full boost from 6000 up etc etc..
HKS knows how to alter a turbo to make it spool and flow, I would like to see a plain jain T70 1.0 q trim garrett to compare it to my T51 to see just what they do/did to it..
Comparing my T51s to my garrett run of the mill To4e 60 trom with p trim divided 1.15 ar is interesting..
The T51 :
COMPRESSOR:
-Wheel- 56 Trim - 70.3 Inducer / 94.0 Major
-Housing- 100 Inlet / 80 Outlet
TURBINE:
-Wheel- 76 Trim - 82.0 Major / 71.4 Exducer
-Housing- T04 flange outlet - 1.00 undivided

The garrett To4E 60 trim
-Compressor 58.17 Inducer 74.93 Major
-Comrpessor a/r .70
-Turbine p trim divided 1.15 a/r
74.22 Major 64.62 exducer
By the stats and all accounts the Garrett T04e should spool considerably faster than the much larger HKS T51s, even considering the T51 is undivided.
Going through my datalogs tonight between the 2 turbos, reveals that the T51 spools faster by nearly 400 rpm on the same engine/manifold/exhaust setup, I datalog on the same chunk of road, in the same exact manner all the time, I also notice that I using far less throttle with the T51 and its still spools faster,
I think thats the HKS magic you are paying for...I dont think you will get that kind of results or quality with HKS knock offs, and judging by what people have said who run garden variety Garrets in the T70 and plus range, they dont get those kind of results either...
I think you do get what you pay for in the end after analysing my data...Maxt

 

Interesting Max...at what RPM do you hit full boost with the T51s? Also, what mods/porting do you have? I always figured a T51s, T51R KAI / SPL would all have horrible lag due to their size...but of course I have no first hand experience with any HKS turbos bc no one I know will shell out the $$$.

 

Thanks for the info Max

 

What do you guys think of this KFG-T51R turbo from http://members.shaw.ca/kfgroup/Turbo_&_Upgrades.htm

 

We have setup and ran both T51's and GT42R's, I will take the 42R, I have seen better response and prefer the fact the parts should something go wrong are easier to hunt down. THe HKS stuff uses standard Garrett parts they just mix and match but there is no "magic" per se. I do however like the V-band turbine housing better for working with.

 

My engine is partial bridged, fd intake stuff like that. Yeah, when I first got it I was kinda worried about how it would be being such a large turbo.
The boost of course depends on what gear you are in, both turbos made 10 psi in first, in second, I can hit what ever my boost setting is at about 4800 with the T51 and 5200 with the to4e, most recently that has been 17psi, once I am in 3rd or above, boost is there with throttle input, rpm doesnt seem to matter much. The t04e seemed to hit harder than the t51, but the T51 pulled harder longer, the way the power came on was deceiving, the t51 was making more power before boost setpoint so it feels more linear than the t04e in output.
I was running with a dogmission till it crapped, that was a nice compliment to the larger turbo, since first was taller than the stock trans, it loaded the engine earlier, and I could build more boost faster in 1st, with that gearing change, I could hit boost setpoint at 5000 in first and not drop out of boost between shifts,which meant once the car was boosting in first, there was no lag at all after 1st. It never dropped below the boost threshold between gears.max

 

what is your impression of the z for the fd? there is a 2jze in japan that is supposedly pushing near 700kw with a t04z

 

i'm going halfbridge with a Ball Bearing T51R Kai SPL soon. i'll post a dyno sheet and let you know when i hit full boost. expect my report in about 2-3 months. anyone have any guesses how fast i'll be able to hit 18, 24 and 28 lbs of boost?

 

hopefully 600hp man your nuts, what you need that for?

 

I'll make 600rwhp on stock ports. The half bridge is not needed at all for a street/drag setup. Ari Yallon made well over 600rwhp on stock ports.

 

Yea, I would like to see the results on your dyno

 

No a 1/2 bp is not "necessary", but neither is 600hp... but we still do it anyways

 

Ernie, how much boost are you talking about?

 

neccisary, no. nice, yes! I know a halfbridge isn't neccisary, but i love the sound of them, and the faster spooling will help on that big of a turbo.

Ernie T: I would really like to know your setup.

Edit: i never spell necessary right... or is that even right? lol

 

30-32psi on C-116