I am in a bit of a dilemma...my current turbo is in need of a rebuild to put it mildly, and I am just going to replace it with something different. I ordered a GT40R ball bearing turbo through Aspec and through no fault of theirs, the arrival date is a bit longer than planned. Long enough that my current turbo probably wont make it. Being a daily driver, I need to get something on this car soon and I am looking at other options, specifically the Innovative GT66BB turbo. The compressor maps are very similar. I called Innovative and the turbo is quite a bit more expensive, about $1895 with all the fittings, Vband and a Ptrim Inconnel turbine. Flows 70lbs. a minute. Pricewise it is stretching things a bit but it might be doable for me. I know that Greg from the dark side forum is an innovative dealer and perhaps I can get something slightly less expensive through him or another vendor. Unfortunately his webpage does not work.



Another forum member may loan me his GT40R until mine comes in (at which point my turbo will go to him) but barring that, it seems like the GT66BB would be the best alternative. I have attached the 66 compressor map.



I currently use the GT40R 88mm compressor (exducer) on my T78 and it makes wonderful (understated) top end power. Jason put down 460+ on pump. Good enough for me and I dont want less than that. Really. Am I making the right move here? Feedback appreciated....

Garrett GT40 compressor map

Innovative GT76. Someone said it'll literally bolt right in to a T78 setup sans the Vband connection. Just throwing it out there. Compressor map looks pretty good but I'm sure it's waaaay to big for my needs, no?

And I just want to add, it took me all of five minutes to post the above on this forum. On the other, it took me AN HOUR. Sort of a love/hate relationship. Great job nopistons guys!

Have you called ATP? That's probably where A-Spec is getting it from anyway, but it wouldn't hurt to call. They do say "usually in stock"



GT40R @ ATP Turbo



http://www.atpturbo.com/Merchant2/gr...s/gt40r-01.jpg

Actually Sean and Aspec have better sources than ATP. They're in the same dilemma. Essentially Garrett is the largest supplier of OEM turbos for the major manufacturers. Their performance division, according to Sean, represents about 2% of their total business. So....they manufacture all the OEM turbos they need until the quota is filled and then move on to the performance stuff. Leaving guys like me hanging unfortunately. ATP does have the .84 housing in stock however, but that may be a bit small for a rotary given the 88mm compressor.

Michel

Not to mention I'd rather support an RX7 shop :-)

Innovative is an RX-7 shop?



By the looks of it you could buy the GT-40R with the small housing now AND get the big housing later if you want for cheaper than the GT-66 from Innovative.



If you get the bigger housing later and don't like it or see more power, you've already got the small housing sitting there ready to go back on.



BTW, is it .84 or .95? They list .95 on their site.

A-Spec. RX7 shop. ATP list the .95 on their website but all they have currently is a .84. Wouldn't switching to a .95 housing later on force yet another downpipe reconfigure? Add the cost of the Vband, etc...it'd be darn close to Innovative price if not more. Unless the GT turbine housings are under $300. Right now a GT40R is essentially $1600 without the V-band. The Innovative is $1895 with everything. And the Innovative has a ceramic BB CRHA that rotates 360 degrees so it can be rebuilt if needed and quite easily so. What concerns me is that even Innovative's wheels may not be as efficient as the Garrett GT series. I can't imagine a relatively small outfit out-engineering Allied-Signal and it's vast resources which I'm sure include supercomputer modeling of compressor and turbine wheels. I'm now looking at the Precision Turbo stuff as well, the PT66 and PT67. www.precisionturbo.net

I meant that you were now looking to Innovative for the turbo instead of A Spec anyway.



Hasn't Sean provided your V-band and fittings already as part of the kit you bought from him?



I don't think you will need a new downpipe to change between those A/R ratios.