Greddy vs. GTM TT Kit
 

I know there is obviously going to be some competition, and some die-hard supporters of either, so please stick to the facts without the head-bashing.

Which one is better? Which one will last longer? Which one has a more OEM type feel to it?

Things I don't like about Greddy: They seem to skimp. Aluminum, using oil without water cooling, FOAM!? air-filters.

Things that make me unsure of the GTM: It is cheaper...is this because there is less profit margin, or are some of the components made in-house, or what?

Personally I don't think we've seen enough examples run long term on the streets to make a call. You're also forgetting AAM's turbo kit but that will require an inhouse install, Fusz's Z has it and I believe he's pretty happy with it. I think GTM's success with bullitt's stroker build will show how serious and skilled GTM is.

AAM says something about not re-routing lines off the block and no modification thereof, does the GTM require this?

Also I have read about giving up the windshield washer resivor. Does the GTM give this up?

who really uses windshield washer fluid anyway?

if you live in a desert you do :D

Uh... I do :ughdance:




To OP, yeah, unfortunately not much is known on pro's and con's of each, as there are few cars with either kit at the moment.

Really, I'd say compare and contrast the few dynos there are and cost for each and go from there.

Also, the few odds and ends you don't like that come with either kit can be swapped out (e.g., filters).

I'm 95% certain that the greddy kit does not come with a reflash, so that's one other thing to consider, whereas the GTM kit does, I believe.

I have been installing the GTM stage 2 twin turbo kit in my garage on my car for about the last week. I should have the car done by the end of this weekend, and i intend to do a full review on it. I will give all the info from the pros and cons, to how the car feels, and the customer service that I was givin when I ran into problems and had to call Sam. I will tell you this I don't know about other kits but with the GTM I had to drill 2 holes and tap them in my passanger head. This wasn't hard at all SAM sends a template with his kits for this and my god it is idiot proof. Also you have to drill the Upper oil pan for the return lines for the turbo. Like I said by the end of the weekend I will have up a full review thread and give my thoughts and opinions on this kit and that should help you choose which one you want.
Frank

TONER, are you planning on dyno testing after all is said and done? I know the last person who did the at home install ran a super conservative tune until he got on the dyno. What power goals are you shooting for??

I think your right here buddy. Neither kit has had enough time to prove their self. They both look nice, sound nice and provide great numbers. GTM seems to have a one stop shop for all your needs in the proformance arena and so does greddy. But no one has put a ton of miles on the car yet, well at least not to my knowledge. Greddy does not come with BB turbos and like another said, they also dont throw water into the equation. AAM's kit is for sure a winner and Lou is living proof. The only thing is it is a in house install only. So the only kits to install yourself or have a local shop install would be the Greddy and the GTM and they both seem to be high quality but just not enough long term data at this point. Well at least from the 370z crowd.

Does the Greddy offer a tune out of the box???

Let compare some of the main pros and cons ;)

-GTM kit comes with Pre-Bent Stainless Steel Heat Shields Greddy does not offer any heat shields over the manifold
-GTM Bar and Plate Core Intercooler vs Greddy tube and fin core (bar and plate is proven to be more efficient )
-GTM Ball Bering water and oil cooled Garret turbo VS Greddy journal bushing type turbo and oil cooled only (ball bearing turbos spool faster,more efficient,have a much longer life span and for the 370z oil temp issues going with water cooled turbo is no brainer.
-GTM kit does come with tial 50mm blow off valves VS Greddy No blow off valves are supplied.
-GTM kit is complete with fuel and engine management VS Greddy does not come with neither (have to by separate)
-GTM engine managemen is plug and play (via flash ) Greddy is piggy back system required cutting splicing engine harness.
-GTM kit has a lot of room to grow (6 different turbo stages 9 different a/r ) VS GReddy has one turbo option only available.
-GTM kit cheaper and has better value, you get more for what you pay for VS Greddy
-GTM offers 2 different couplers colors VS Greddy only one
-GTM offers k&n filter VS Greddy foam filters

Sam

Great answer!

Nice Sam.
Another reason to go with GTM, Sam answers all your questions :)

How do you like them apples?

Greddy is :owned:

yea say good bye to it. no way to keep it and route IC lines

Yes I do plan on dyno testing as SAM want's to know what my air to fuel ratio is before I get on the car. The last person that did the home install modme is who I am thinking you are refuring to. He didn't choose to have the conservative tune. When you buy the turn key kit you have to email sam your ecu #, and then he sends you your new tune. Every car is different so there for the tune has to be conservative or you might blow up your engine. The conservative tune is to protect you and GTM from possible engine failure and pointing the finger. Once I get my A/F ration I will call sam and let him know what it is and he will let me know what adjusments he will make. I didn't get that far yet so I am not a 100% positive if he will send me a new tune once he gets the info on how my car is reacting. My power goals are 500rwhp, that is plenty for the street anything more is just asking for problems with the law or accidents. I am a few hours away before starting my car to see how the build went. I have to connect vacum lines, add power stearing fluid and put some oil in my engine then I will be ready to go. In other words I am going to find out what I forgot to tighten lol. Also I think I am the first person to do this on a 370z as a home project. Like I said I plan on doing a full review of the product and problems that I ran into during installation as soon as I get the car done.
Frank