Yes a little rough... But the inside is ported quite smooth for efficient flow... The flange is good for a T3 or T3/T4 turbo. It is designed to hold the turbo high and closer to the intake.
Just wondering if there is any interest before I try to sell it
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01:35 AM
PFF
System Bot
Hockaday Member
Posts: 2165 From: Clifton Park, New York, The States. Registered: Sep 2009
if i had more cash id be interested. my duke is likely going to die soon anyways so ill either get betting a new duke or a new 2.8 (cheapest and easiest swaps....im lazy and poor lol). might as well make the most of what i got lol. anyone know what kinda numbers a duke would put out with a turbo?
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04:28 PM
fieroguy123 Member
Posts: 1523 From: Indianapolis Registered: Sep 2009
There are ways of making the bottom end hold boost, but it's very hard to justify the cost when it's cheaper to do a 4.9, 3.8sc, or 3.4pr. And I don't think you would even make the h.p that a stock 3.8na makes. Betting the most you could get out of it without serious head, intake, and exhaust work is about 175. But hey, anything can be done if you have enough desire and money.
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04:49 PM
Hockaday Member
Posts: 2165 From: Clifton Park, New York, The States. Registered: Sep 2009
I spent many hours making this manifold... My goal was to make it functional and strong instead of pretty. It bolts perfectly to the head and the ports are matched with the ports on the head. Unlike other turbos I've seen installed on 2.5's in fieros... this manifold holds the turbo up high and away from the starter and the turbo will be very visible when you open the deck lid and show it off.
Would say $100 be a reasonable price? ... I may put it on ebay.
Persoanly if you guys are going to turbo your dukes. as said make them very low PSI. The duke internals wernt built for pressure. As i stated before. the duke was built for the sole purpos of saving gas during the gas crisis. the birth of the fiero originated from the gas price's.
[This message has been edited by pontiackid86 (edited 06-01-2010).]
I would definately use a small turbo... A small turbo will spool faster and make good boost well before the engine hits the redline... a large turbo will force you to go beyond the dukes rev limit.
I did an unbelieveable amount of research before building my 2.0 turbo 88 gt, and learned more than I ever wanted to know about turbo's. Here's my advice.... Assuming you have stock internals in reasonably good shape, and you use the t-25 garrett from the turbo sunbird, 80's eclipse/talon, etc (it's small, it'll spool very quickly and is pretty durable/reliable). I would set the wastegate at 4psi and DEFINITELY no more than 5, you should get roughly 35-45 h.p. which would be very noticeable, and if you drive it nicely maybe 50k miles more out of your engine. Now, if you're starting off with a 100k+ duke, and you go and run 5 psi, you might make it down the track 3 or 4 times before the crank let's loose or you break a rod. Absolutely under no circumstances turbo an 84' block, it's weaker than the later year models and it probably won't make it a day. Obviously, this is all my opinion.
I think...no i know this is a very reasonable price but I am not in the position to risk the Oppenheimer Moment. would be very good to the few that want to build up the duke.
Looking at pictures of these things online, are you sure it will fit between the engine and firewall?
Yes.... I did several test fits with a turbo. Lets not forget that the exhaust inlet on a turbo is offset and not centered like the inkake inlet. The turbo would be directly above the manifold with the exducer facing toward the Fiero's intake. It all fits. The only problem would be in the 84 fiero.... the AC hoses would definately be hitting the turbo. In the 84 the AC hoses are routed high...
Let me be more specific. What pressure will it put out at 3-4.5 k rpm?
a 57trim could probably muster about 27-30psi. A stock DSM turbo could probably do 18-20. A random T2 off a saab or something could probably do almost 15.
They could also probably do more, but these are the effective max pressure ratios of the turbos with a small amount of choke point factored in.
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09:01 AM
Finally_Mine_86_GT Member
Posts: 4809 From: Hyde Park, New York Registered: Sep 2006
^ agree totally... Been there, done that. Not smart. At one point in my life (took years to figure out) was able to turbo a stroker and a duke... Again... not smart. neither of them were very reliable and the duke went sky high 3 days after. Was only running 8psi regulated on both. Now the 2.8 on the other hand.... next project.
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09:15 AM
Dennis LaGrua Member
Posts: 15143 From: Hillsborough, NJ U.S.A. Registered: May 2000
The trouble here is that Duke engines are 22-26 yrs old old and as such are poor candidates for turbocharging. Even a new Duke would not be a good choice as to set it up properly would require a new larger throttle body, a complete retune and very low boost levels. So for the $$$$ spent the resuts wouldn't be worth it. I am not sure but that manifold may fit the SD4 with a few mods. That engine will hold boost but it is a costly build..
------------------ " THE BLACK PARALYZER" -87GT 3800SC Series III engine, 3.4" Pulley, N* TB, LS1 MAF, Flotech Exhaust Autolite 104's Custom CAI 4T65eHD w. custom axles, HP Tuners VCM Suite. "THE COLUSSUS" 87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H " ON THE LOOSE WITHOUT THE JUICE "
At one point in my life (took years to figure out) was able to turbo a stroker and a duke... Again... not smart. neither of them were very reliable and the duke went sky high 3 days after. Was only running 8psi regulated on both. Now the 2.8 on the other hand.... next project.
