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Twin GT45's on 355, yes or no?

15K views 48 replies 18 participants last post by  mike colemire  
#1 ·
355 SBC, most likely Edelbrock RPM heads spinning no more than 6,500-7,000, undecided on cam until I get the turbos and head selection pinned down. Looking at two of the T4 1.05 A/R 92 eBay GT45's. I've been told they would be lazy, others have said they would work great. I'm about ready to pull the trigger, just want some feedback. Thanks!
 
#4 ·
#5 · (Edited)
The gt45's are only $190 shipped! Also found a package deal out there where you get a WG/BOV/turbo blanket and a GT45 for $300 shipped. Thats a pretty hard price to beat IMO. $110 for all the extras is a smokin deal.

Lag under 3500 rpm? My "tight" converter stalls over 3500 rpm once boost kicks in. I can't imagine many would spend much time under 3500.
 
#8 · (Edited)
The appeal of the gt45 to me is of course cost first. But also you are pretty much guaranteed 1:1 back pressure ratios. Which means u can run a more aggressive cam and make much more power per LB of boost. Instantly having 20+ lbs of boost on a typical v8 isnt needed IMO. then u just fight traction all the time. The gt45 is big and heavy with old wheel design tech. But for 190 each I still think they are the best value out there.

http://r.ebay.com/DmJvH5
 
#9 ·
The appeal of the gt45 to me is of course cost first. But also you are pretty much guaranteed 1:1 back pressure ratios. Which means u can run a more aggressive cam and make much more power per LB of boost. Instantly having 20+ lbs of boost on a typical v8 isnt needed IMO. then u just fight traction all the time. The gt45 is big and heavy with old wheel design tech. But for 190 each I still think they are the best value out there.

http://r.ebay.com/DmJvH5
That's stupid cheap.. Ordering 2 of them now. What size gate would you recommend?
 
#38 · (Edited)
Rule is 120% of the exducer, technically 3.6”. 3.5” is plenty IMO, no need for 4”. Always best to go as far as possible with the larger diameter pipe. For twins in an application like yours, I’d just go for what’s easiest.

If it were me, I’d weld 3.5” directly to the housing with some sort of 3.5” electric dump. Then run a baby 2” pipe right off the down pipe. It will be the quietest, best flowing, and lightest option(probably cheaper too) No mufflers required. Something like this off each turbo will be very quiet. My 2" pipe dumps under the car up front. Fumes are the only concern really. With E85 I don't notice any fumes. If I run pump gas it gets pretty stinky in the cab.

Image
 
#39 ·
Is the GT45 in the $300 deal the same one everyone uses for their budget builds? I've never seen one with the Emusa logo on the compressor housing. Unless this is a housing unique to his seller.