First off, sorry if this has been asked, but i searched and couldn't find the answer i wanted.

I know that GT-series turbos can fit onto the APS manifolds, but is it possible to upgrade the turbos on the Greddy kit to a newer technology turbo?

thanks for the help.

 

yes...there is a 20g upgrade...the greddy tt kit comes with 18g's.....
http://sgpracing-store.stores.yahoo....ratdh10tu.html

 

people have made over 600rwhp with the 18g's ....so u know...

 

2 companies you should talk to if you want to upgrade the Greddy turbos. Deadbolt and Forced Performance. They can make the turbos more poweful then most people think. If I upgrade mine, I will be sending them to Deadbolt.

 

cool...thanks for the replies.

 

If you are talking about upgradig to ball bearing housings.....then,no! Greddy uses mitsubishi turbos with an odd 3 bolt flange. the 3-bolt flange is what makes it hard to find different turbos to fit the housings.

 

Please expound on this one?Are they simply unbolting the housing and replacing the turbo guts with the 20g compressor? There is no BB upgrade for the greddy's that I am aware of.
To the OP, get the APS or other style manifolds with the 4 bolt flange, it will increase your turbo selection greatly.

 

Julian.......those shops are replacing the guts and machining the stock greddy housings to fit. IMO, you really need to go with a larger turbine housing if you really want to make a significant change. the 2" inlet/outlet on the greddy turbo is the biggest limiting factor.

 

Correct, however the next step up sized greddy turbo with flange is a t-66 I belive..Physically will not fit If I am correct..I went to Greddy and was hashing over that upgrade otion myself in the past..

 

Not sure on the BB option, cause I havent really looked into it. The 18g wheel is a 40lb wheel, the 20g is a 44lb wheel, and Deadbolt can put a 55lb wheel in it (if our compressor housing is the larger version, I sent them pictures and they say it looks to be). They can either do the TD06H turbine wheel with the 55lb wheel or do a clipped TD05H wheel for better spool. If our housing can not fit the 55lb wheel, they offer a 49lb wheel. They were confident that IF the 55lb wheel fits, the turbos would be good for 520 Crank HP per turbo.

There is no bigger turbin housing for these turbos tho, but that still doesnt mean you can't crank out some more HP with them.

 

Just get some new flanges and weld them on the manifolds/downpipes.... and make sure the turbos within said confined space (which I dont think allows for much larger). I know its an oversimplification, but it's simply a method of finding the right flanges for the turbo you want.

 

I thought about that for the Greddy kit, but there is really not any extra room for bigger turbos. Also, Deadbolt thinks the upgraded greddy turbos would be as powerful as a 3076.

 

the compressor housings are nicely sized on the greddys, but doing what craig suggested will allow you to go with bigger turbine housings which will allow you to build a motor for higher rpm usage, too.

 

man, decisions decisions, hahaha. I like the newer ball bearing turbos, but i came across a pretty good deal on a used Greddy kit...plus the fact that lots of people on here have made over550whp with the Greddy kit has me thinking...especially since my main goal is a safe and reliable 500rwhp daily driver.

 

check this out:

GREDDY TURBOCHARGERS

GREDDY TURBOCHARGERSGReddy exclusively uses GReddy Spec. Mitsubishi Heavy Industries, Japan Turbochargers, many of which are unique to us, including the popular 18G’s, compact TZ line and large hybrid T-power Turbos. It is well known for selling Mitsubishi turbochargers which are among the highest quality turbos in the industry today. They utilize a durable center cartage, an extra large free-floating bushing with a large diameter center shaft. We believe this design to be superior to all other standard bushing turbos as well as many ball bearing types. Through testing we have found that some of these Mitsubishi turbos have better response than similar sized ball bearing competitors in certain applications. The most important key is how well matched the turbocharger is for your application or how well designed a turbo kit is for the end goal. Peak horsepower numbers, large external dimensions and max boost levels are not the only important factors. Variations in properly sized housings and wheels can mean all the difference in drivable, usable power. With well over 20 years of performance turbocharger experience, GReddy is able to offer an ideal combination of response and peak power by properly matching the turbocharger size and design to suit its desired application. From high power, top level race cars to our popular bolt-on and upgrade turbo kit lines, the GReddy Turbocharger line can provide a best match for just about any application. Specifically for Bolt-on Kits, we generally build kits around turbochargers at their lower end of their efficiency range, so although they have good bolt-on performance, the kits are still highly upgradable for higher boost applications. By utilizing oil only center cartridges, installation is simplified without affecting reliability as long as proper turbo timing and oil is used and regularly changed. This turbo design also helps in the engine's reliability by not taxing the engine’s coolant system. With sizes varying from the smaller TF035 and TD04 families up to the 1000+hp capable T88H, GReddy turbochargers offer the great performance for the street and competition.

 

Hype, BS, or is there any truth in that advertising paragraph?

 

the hype is in the ball bearing world. dyno graphs prove that the ball bearing turbos in the APS kit do not spool any faster, not even a couple hundred RPM, than the greddy turbos do. ball bearings are not getting you anywhere until you are talking about significantly larger turbos.

as for using the aps manifolds versus greddy manifolds for upgraded turbos... the aps manifolds use a T25 flange... its not any larger than the 3 bolt on the greddy manifolds, so neither manifold is going to allow for eliminating backpresure there... all you can do is mess with the turbine housings... and the greddy flange doesnt currently have any options for larger turbine housings with the same size 3 bolt flange that also fit the chra used in the kit.

 

wow.....and for all these years, I have believed "Fletch" when he said "it's all ball bearings these days."