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given the space constraints, can it be done. has anyone done it or somethign similar? i dont care if you think a large single is superior. i just want input and help and one or two ppl telling me i cant do it to get a little drive going.
pretty sure it would be doable... i dont' know much about turbos yet, but rx7store.net has parallel (i'm pretty sure they are parallel if you look at the exhaust manifold(s) in the picture it looks like they are 100% separate). click here for rx7store.net's dual T28 kit. i can't imagine that the T25's would be much bigger, but again, i don't know TOO much about turbos yet so i don't know how big they are.
hah, i didnt know i could go that much bigger. i was hoping to push about 15psi street with a potential for 20+, my turbo choice was somewhat ambiguous but the T25 seemed small enough for quick spool and large enough to meet my needs. the numbers will be thoroughly crunched before i delve into the project.
does anyone have any better turbo's for a twin setup?
id say it would spool just as quickly as our stock sequentials but would have the capability to boost much higher safely. but, i wouldnt know the first place to start to fabricate a sequential system. im pretty sure the rx7store turbos are parallel.
hmmm, ok, in regard to ripzta, there is a australian fd running twin gt25s, each rotor is dedicated its own turbo. as for power delievery he states that at around 3000rpm it is about the same as stock but then pulls much harder, of course youd get the same kinda reponse from a garret gt35/40 plus it would be cheaper
well as far as turbos go the T25's are pretty cheap, mandrel bending and welding can be done by any competent exhaust shop. i figure i can do it cheaper than a decent single like the gt35-40. ill look into the rx7store plumbing but im not sure i trust them...if they cant get the fitment of my resonated midpipe right i dont know that i trust them to do turbos but i want to do this because all i see is single turbo fd's and frankly it bores me. its the same old crap these days and if theres something i cant stand its syndication in the aftermarket idustry. maybe it wont be as efficient or powerful but at least i will be content. not to mention if i lose a seal i will only take out one cheap turbo.
The supra has equal size turbos that are sequential like the FD's. The twin T28 Kit should make over 400RWHP on pump gas, it would be a similar setup to what the skyline GT-Rs use but spoo lup would be much quicker. I have never heard of someone doing non-equal size turbos, since each turbo would have to run off of 1 exhaust port, what is the point? If you run something like a T78 off 1 exhaust port it will never spool. Plus you would make a really big difference in the restriction of the exhaust on each side.
i think the idea was sequentials with a small primary and larger secondary. the primary would run off of both and spool quickly and run while the large is spooling then switch to the large one... both run off of both ports
As stated above, the T28 is a Garrett T25/T3 hybrid. I had this turbo before. It looks like this:
It's a T25 turbine and CHRA mated to a 60 trim Garrett T3 compressor. This turbo has seen 275-300 whp on a lot of Nissan engines. A pair of them on an FD3S should put you well into the 450 whp range.
Honestly though, I have doubts about fitment. I had that turbo before and compared to the stock Hitachi, the compressor housing is huge.
The T28 mentioned above is the factory turbo from the JDM S14 Silvia. It's a water-cooled ball-bearing design and can be had cheap. (I got mine for 475 bucks)
A more promising route would be to use the Garrett T25 from the JDM S13 Silvia. It is not a hybrid turbo...just a straight T25. The T25 compressor housing is a lot smaller than the T3 housing used in the T28. It won't make as much power as T28, but it will be smaller in size.
The 2nd gen DSM's all came with a T25 turbo using a Garrett T25 center section with Mitsubishi housings. Even though this IS technically a T25, I think there would be fitment issues due to the weird turbine housing.
i was planning on using the GT25 but i wasnt sure on which one and what A/R i was looking to have 550hp potential but run at 450hp i was hoping i could source A/R would produce that and the rx7store twins use the T28's so i was pretty sure fitment issues would be minimal. but again this is all preliminary by several months or so. i still need to save up like 4 grand so that i could be relatively assured to get the project done without running out of budget.
alrite, thats cool, but yeah, sounds like its gonna be an interesting setup once you get it all done, be sure to keep us posted on what you decide. hahhah, and go haltech over pfc. i know lots of ppl seem to be running them in the states, but i still dont think that the pfc is the best ecu for a rotary