If you read my last thread, you know about my little project to turbocharge the D16Y8 in my car and run it on E85. I'm shooting for around 200-250 at the flywheel, and I'm wondering what would get a bigger horsepower gain, increasing compression, increasing boost, or a little of both to take advantage of E85s 105 octane rating. Plus, how much power can my transmission take? It's the s40 5-speed manual. And I know this is a long shot, but, could the OEM clutch handle that kind of power? I would appreciate any advice, and, for the record, I am going to replace the rods and pistons with forged aftermarket units for safety, and because my engine has almost 200k on it. Please tell me what else I would need to upgrade to get my car to handle 210-250hp. Thank you.
What nets the biggest HP gain on a turbo motor, more compression, or more boost?
- Thread starter rev junkie
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I think e85 is a little more than 105 octane. Stock clutch will slip with 200+ hp, 9:1 is optimal compression for boost. Do a compression test before you do anything else, 200k is a lot of miles you might want to sleeve your motor, depending on the results...
To be safe you should get ARP Headstuds and some sort of aftermarket rods, those are the first things that will fail before anything else. Ohhh and don't forget to get a new headgasket. Everything else should be fine with only 200-250hp at the wheels.
To be safe you should get ARP Headstuds and some sort of aftermarket rods, those are the first things that will fail before anything else. Ohhh and don't forget to get a new headgasket. Everything else should be fine with only 200-250hp at the wheels.
First thing is your oil pump, the oil pump for D16Y8 is not as good as D16Z6, so caz of that u might have spun bearings and stuff in the near future. For your comp and boost, i would say get a low comp pistons and eagle rods and go for a higher boost, as long your block is built then you are good for that 250 hp or even 300 hp but your OEM clutch won't last long, so an aftermarket clutch is strongly recommended, and don't forget to recerface your OEM flywheel. one more advise TUNE TUNE TUNE or all that work and parts will go down the drain, if i said any incorrect information please someone corrects me...
good luck on your goals
good luck on your goals
I don't really want to lower compression because I want to keep my gas mileage reasonable. Would 10.5:1 compression and about 6-9psi of boost still get me reasonable power without detonation? And would forced induction amplify the horsepower increase from increased compression?
Also, I forgot to mention, would the stock pistons be okay for running up to 10psi boost, or should I get forged ones?
because your engine has high mileage i would suggest rebuilding it. stock d series internals wont handle over 230whp even with a good tune. your stock clutch will need to be replaced as well. basically if you want to make anymore that 230whp on a d series you need to build the bottem end. vitara builds are good for 4-500hp.
also the amount of boost in PSI your putting down dosent mean s**t unless you know the size of turbo your using. a tiny turbo can push 10psi and like 30hp and the engine dosent even notice it. a big turbo pushing the same PSI would destroy it. you need to learn about turbos before you even think of putting one on.
i had a 93 hatch si with a d16z6 and i ran an ebay kit T40E turbo @ 5.8PSI and it made 180whp. that was with skunk2 intake manifold, exedy stage 1 clutch, 2.5" downpipe/testpipe/catback and a JDM Sport FMIC. I street tuned it on chrome. just used a dyno to see actual numbers.
also the amount of boost in PSI your putting down dosent mean s**t unless you know the size of turbo your using. a tiny turbo can push 10psi and like 30hp and the engine dosent even notice it. a big turbo pushing the same PSI would destroy it. you need to learn about turbos before you even think of putting one on.
i had a 93 hatch si with a d16z6 and i ran an ebay kit T40E turbo @ 5.8PSI and it made 180whp. that was with skunk2 intake manifold, exedy stage 1 clutch, 2.5" downpipe/testpipe/catback and a JDM Sport FMIC. I street tuned it on chrome. just used a dyno to see actual numbers.
The turbo in question is a Garrett GT28R.
more boost....